ADP1712-EVALZ
Analog Devices Inc.The ADP1712 / ADP1713?/ ADP1714, available in a tiny, 5-lead TSOT package, are low dropout linear regulators that operate from 2.5 V to 5.5 V and provide up to 300 mA of output current. The low 170 mV dropout voltage at a 300 mA load improves efficiency and allows operation over a wide input voltage range. Using a novel scaling architecture, ground current is a very low 75 ?A when driving a 100 ?A load, making the ADP1712 / ADP1713 / ADP1714?ideal for battery-operated portable equipment.The ADP1712 / ADP1713 / ADP1714?are available in 16 fixed output voltage options. The ADP1712 is also available in an adjustable version, which allows output voltages that range from 0.8 V to 5 V via an external divider. The ADP1712 fixed version allows an external capacitor to be connected to program the soft-start time. The ADP1713 allows a reference bypass capacitor to be connected, which reduces output voltage noise and improves power supply rejection. The ADP1714 includes a tracking feature, which allows the output to follow an external voltage rail or reference.The ADP1712 / ADP1713 / ADP1714?are optimized for stable operation with small 2.2 ?F ceramic output capacitors, allowing good transient performance while occupying minimal board space. An enable pin controls the output voltage on all devices, and an undervoltage lockout circuit disables the regulator if IN drops below a minimum threshold. The parts also have short circuit protection and thermal overload protection, which prevent damage to the devices in adverse conditions.APPLICATIONS Mobile phones Digital camera and audio devices Portable and battery-powered equipment Post dc-dc regulation
ADP1720-EVALZ
Analog Devices Inc.The ADP1720 is a high voltage, micropower, low dropout linear regulator. Operating over a very wide input voltage range of 4 V to 28 V, the ADP1720 can provide up to 50 mA of output current. With just 28 ?A of quiescent supply current and a micropower shutdown mode, this device is ideal for applications that require low quiescent current.The ADP1720 is available in fixed output voltages of 3.3 V and 5.0 V. An adjustable version is also available, which allows the output to be set anywhere between 1.225 V and 5.0 V. An enable function that allows external circuits to turn on and turn off the ADP1720 output is available. For automatic startup, the enable (EN) pin can be connected directly to the input rail.The ADP1720 is optimized for stable operation with small 1 ?F ceramic output capacitors, allowing for good transient performance while occupying minimal board space.The ADP1720 operates from ?40?C to +125?C and uses current limit protection and thermal overload protection circuits to prevent damage to the device in adverse conditions.Available in a small thermally enhanced MSOP package, the ADP1720 provides a compact solution with low thermal resistance.Applications DC-to-DC post regulation PCMCIA regulation Keep-alive power in portable equipment Industrial applications
ADP172CB1.26-EVALZ
Analog Devices Inc.The?ADP170/ADP171/ADP172 are low voltage input, low quiescentcurrent, low-dropout (LDO) linear regulators that operate from1.6 V to 3.6 V and provide up to 300 mA of output current. The low 50 mVdropout voltage at 300 mA load improves efficiency and allows operation over a wide input voltage range. The low 23 ?A of quiescent current at no load makes the ADP172 ideal for battery-operated portable equipment.The ADP172 is capable of 31 fixed-output voltage options, ranging from 0.8 V to 3.0 V. The ADP172 is optimized for stable operationwith small 1 ?F ceramic output capacitors. Ideal for powering digital processors, the ADP172 exhibits good transient perform-ance and occupies minimal board space. Compared with commodity-type LDOs, the ADP172 provides 20 dB to 40 dBbetter power supply rejection ratio (PSRR) at 100 kHz, making the ADP172 an ideal power source for analog-to-digital converter (ADC) mixed-signal processor systems and allowing use of smaller size bypass capacitors. In addition, low output noiseperformance without the need for an additional bypass capacitorfurther reduces printed circuit board (PCB) component count.Short-circuit protection and thermal overload protection circuits prevent damage in adverse conditions. The ADP172 is availablein a tiny 4-ball, 0.5 mm pitch WLCSP for the smallest footprintsolution to meet a variety of portable power applications.APPLICATIONS Mobile phones Digital camera and audio devices Portable and battery-powered equipment DSP/FPGA/microprocessor supplies Post dc-to-dc regulation
ADP172CB-3.0-EVALZ
Analog Devices Inc.The?ADP170/ADP171/ADP172 are low voltage input, low quiescentcurrent, low-dropout (LDO) linear regulators that operate from1.6 V to 3.6 V and provide up to 300 mA of output current. The low 50 mVdropout voltage at 300 mA load improves efficiency and allows operation over a wide input voltage range. The low 23 ?A of quiescent current at no load makes the ADP172 ideal for battery-operated portable equipment.The ADP172 is capable of 31 fixed-output voltage options, ranging from 0.8 V to 3.0 V. The ADP172 is optimized for stable operationwith small 1 ?F ceramic output capacitors. Ideal for powering digital processors, the ADP172 exhibits good transient perform-ance and occupies minimal board space. Compared with commodity-type LDOs, the ADP172 provides 20 dB to 40 dBbetter power supply rejection ratio (PSRR) at 100 kHz, making the ADP172 an ideal power source for analog-to-digital converter (ADC) mixed-signal processor systems and allowing use of smaller size bypass capacitors. In addition, low output noiseperformance without the need for an additional bypass capacitorfurther reduces printed circuit board (PCB) component count.Short-circuit protection and thermal overload protection circuits prevent damage in adverse conditions. The ADP172 is availablein a tiny 4-ball, 0.5 mm pitch WLCSP for the smallest footprintsolution to meet a variety of portable power applications.APPLICATIONS Mobile phones Digital camera and audio devices Portable and battery-powered equipment DSP/FPGA/microprocessor supplies Post dc-to-dc regulation
ADP1740-1.5-EVALZ
Analog Devices Inc.The ADP1740/ADP1741 are CMOS, low dropout linear regulators that operate from 1.6 V to 3.6 V and provide up to 2 A of output current. These low VIN / VOUT LDOs are ideal for regulation of nanometer FPGA geometries operating from 2.5V down to 1.8V I/O rails, and powering core voltages down to 0.75V. Using an advanced, proprietary architecture, the ADP1740/ADP1741 provide high power supply rejection ratio (PSRR) and low noise, and achieve excellent line and load transient response with only a small 4.7 ?F ceramic output capacitor.The ADP1740 is available in seven fixed output voltage options.?The ADP1741 is an adjustable version that allows output?voltages ranging from 0.75 V to 3.3 V via an external divider. The ADP1740/ADP1741 allow an external soft start capacitor?to be connected to program the startup. A digital power-good?output allows power system monitors to check the health of the?output voltage. The ADP1740/ADP1741 are available in a 16-lead, 4 mm נ4 mm LFCSP, making them not only very compact solutions,?but also providing excellent thermal performance for applications?that require up to 2 A of output current in a small, low?profile footprint..APPLICATIONS Server computers Memory components Telecommunications equipment Network equipment DSP/FPGA/microprocessor supplies Instrumentation equipment/data acquisition systems
ADP1761-1.3-EVALZ
Analog Devices Inc.The ADP1761 is a low noise, low dropout (LDO) linear regulator. It is designed to operate from a single input supply with an input voltage as low as 1.10 V, without the requirement of an external bias supply to increase efficiency and provide up to 1 A of output current.The low 30 mV typical dropout voltage at a 1 A load allows the ADP1761 to operate with a small headroom while maintaining regulation and providing better efficiency. The ADP1761 is optimized for stable operation with small 10 ?F ceramic output capacitors.The ADP1761 delivers optimal transient performance with minimal board area.The ADP1761 is available in fixed output voltages ranging from 0.9 V to 1.5 V. The output of the adjustable output model can be set from 0.5 V to 1.5 V through an external resistor connected between VADJ and ground.The ADP1761 has an externally programmable soft start time by connecting a capacitor to the SS pin. Short-circuit and thermal overload protection circuits prevent damage in adverse conditions. The ADP1761 is available in a small 16-lead LFCSP package for the smallest footprint solution to meet a variety of applications.APPLICATIONS Regulation to noise sensitive applications such as radio frequency (RF) transceivers, analog-to-digital converter (ADC) and digital-to-analog converter (DAC) circuits, phase-locked loops (PLLs), voltage controlled oscillators (VCOs) and clocking integrated circuits Field-programmable gate array (FPGA) and digital signal processor (DSP) supplies Medical and healthcare Industrial and instrumentation Automotive
ADP1828HC-EVALZ
Analog Devices Inc.The ADP1828 is a versatile and synchronous PWM voltagemode buck controller. It drives an all N-channel power stageto regulate an output voltage as low as 0.6 V to 85% of the inputvoltage and is sized to handle large MOSFETs for point-of-loadregulators. The ADP1828 is ideal for a wide range of high powerapplications, such as DSP and processor core I/O power, andgeneral-purpose power in telecommunications, medical imaging,PC, gaming, and industrial applications. It operates from inputbias voltages of 3 V to 20 V with an internal LDO that generatesa 5 V output for input bias voltages greater than 5.5 V.The ADP1828 operates at a pin-selectable, fixed switchingfrequency of either 300 kHz or 600 kHz, or at any frequencybetween 300 kHz and 600 kHz with a resistor. The switchingfrequency can also be synchronized to an external clock up to2? the part?s nominal oscillator frequency. The clock output canbe used for synchronizing additional ADP1828s (or theADP1829 controllers), thus eliminating the need for an externalclock source. The ADP1828 includes soft start protection tolimit any inrush current from the input supply during startup,reverse current protection during soft start for a prechargedoutput, as well as a unique adjustable lossless current-limitscheme utilizing external MOSFET RDSON sensing.For applications requiring power-supply sequencing, theADP1828 provides a tracking input that allows the outputvoltage to track during startup, shutdown, and faults. Theadditional supervisory and control features include thermaloverload, undervoltage lockout, and power good.The ADP1828 operates over the ?40?C to +125?C junctiontemperature range and is available in a 20-lead QSOP and 20-lead, 4mm ? 4mm LFCSP.APPLICATIONS Telecom and networking systems Base station power Set-top boxes, game consoles Printers and copiers Medical imaging systems DSP and microprocessor core power supplies DDR termination
ADP1851-EVALZ
Analog Devices Inc.The ADP1851 is a wide range input, dc-to-dc, synchronousbuck controller capable of running from commonly used 3.3 Vto 12 V (up to 20 V) voltage inputs. The device nominallyoperates in current mode with valley current sensing providingthe fastest step response for digital loads. It can also be configured as a voltage mode controller with low noise and crosstalkfor sensitive loads.The ADP1851 is ideal in system applications requiring multipleoutput voltages. The ADP1851 includes a synchronization featureto eliminate beat frequencies between switching devices. It also provides accurate tracking capability between supplies andincludes precision enable and power-good functions for simple, robust sequencing.The ADP1851 provides a high speed, high peak current gate driving capability to enable energy efficient power conversion. The device can be configured to operate in power saving modeby skipping pulses, reducing switching losses, and improving efficiency at light load and standby conditions.The accurate current limit allows design within a narrowerrange of tolerances and can reduce overall converter size andcost. The ADP1851 can regulate down to 0.6 V output using ahigh accuracy reference with ?1% tolerance over thetemperature range of ?40?C to +125?C.With its wide range input voltage, the ADP1851 provides thedesigner with maximum flexibility for use in a variety of systemconfigurations; loop compensation, soft start, frequency setting, power saving mode, current limit, and current sense gain canall be programmed using external components. In addition, theexternal RAMP resistor allows the selection of optimal slopeand VIN feedforward in both current and voltage modes for excellent line rejection. The linear regulator and the bootstrapdiode for the high-side driver are internal.Protection features include undervoltage lockout, overvoltage, overcurrent/short circuit, and overtemperature.Applications Intermediate bus and POL systems requiring sequencing and tracking, including Telecom base station and networking Industrial and instrumentation Medical and healthcare
ADP195CP-EVALZ
Analog Devices Inc.The ADP195 is a high-side load switch designed for operation between 1.1 V to 3.6 V and protected against reverse current flow from output to input. This load switch provides power domain isolation helping extended power domain isolation. The device contains a low on-resistance, P-channel MOSFET that supports over 500 mA of continuous current and minimizes power loss. The low 1 ?A of quiescent current and ultralow shutdown current make the ADP195 ideal for battery-operated portable equipment. The built-in level shifter for enable logic makes the ADP195 compatible with many processors and GPIO controllers.In addition to operating performance, the ADP195 occupies minimal printed circuit board (PCB) space with an area of less than 1.0 mm2 and a height of 0.60 mm.It is available in an ultrasmall 1 mm ? 1 mm, 4-ball, 0.5 mm pitch WLCSP. A 6-lead 2 mm ? 2 mm ? 0.55 mm, 0.65 mm pitch LFCSP is also available.APPLICATIONS Mobile phones Digital cameras and audio devices GPS devices Personal media players Portable and battery-powered equipment
ADP2126-1.2-EVALZ
Analog Devices Inc.The ADP2126 /?ADP2127 are high frequency, step-down, dc-to-dc converters optimized for portable applications in which board area and battery life are critical constraints. The fixed 6 MHz operating frequency enables the use of tiny ceramic inductors and capacitors and the regulators use spread spectrum frequency modulation to reduce EMI. Additionally, synchronous rectification improves efficiency and results in fewer external components.At high load currents, the ADP2126 / ADP2127 use a voltage regulating pulse-width modulation (PWM) mode that maintains a constant frequency with excellent stability and transient response. Light load operation is determined by the state of the MODE pin. In forced PWM mode, the converter continues operating in PWM for light loads. Under light load conditions in auto mode, the ADP2126 / ADP2127 automatically enter a power-saving mode, which uses pulse frequency modulation (PFM) to reduce the effective switching frequency, thus ensuring the longest battery life in portable applications.The ADP2126 / ADP2127 are enabled by a 6 MHz to 27 MHz external clock signal applied to the EXTCLK pin. Certain models can also be enabled with a logic high signal. When the external clock is not switching and in a low logic state, the ADP2126 / ADP2127 stop regulating and shut down to draw less than 0.3 ?A (typical) from the source.The ADP2126 / ADP2127 have an input voltage range of 2.1 V to 5.5 V, allowing the use of single Li+/Li polymer cell, three-cell alkaline, NiMH cell, and other standard power sources. The ADP2126 / ADP2127 are internally compensated to minimize external components and can source up to 500 mA. Other key features, such as cycle-by-cycle peak current limit, soft start, undervoltage lockout (UVLO), output-to-ground short-circuit protection, and thermal shutdown provide protection for internal and external circuit components.APPLICATIONS Mobile phones Digital still/video cameras Digital audio Portable equipment Camera modules Image stabilization systems
ADP2138CB-1.5EVALZ
Analog Devices Inc.The ADP2138 and ADP2139 are high efficiency, low quiescent current, synchronous step-down dc-to-dc converters. The ADP2139 has the additional feature of an internal discharge switch. The total solution requires only three tiny external components. When the MODE pin is set high, the buck regulator operates in forced PWM mode, which provides low peak-to-peak ripple for power supply noise sensitive loads at the expense of light load efficiency. When the MODE pin is set low, the buck regulator automatically switches operating modes, depending on the load current level. At higher output loads, the buck regulator operates in PWM mode. When the load current falls below a predefined threshold, the regulator operates in power save mode (PSM), improving light load efficiency.The ADP2138/ADP2139 operate on input voltages of 2.3 V to 5.5 V, which allows for single lithium or lithium polymer cell, multiple alkaline or NiMH cell, PCMCIA, USB, and other standard power sources. The maximum load current of 800 mA is achievable across the input voltage range.The ADP2138/ADP2139 are available in fixed output voltages of 3.3 V, 3.0 V, 2.8 V, 2.5 V, 1.8 V, 1.5 V, 1.2 V, 1.0 V, and 0.8 V. All versions include an internal power switch and synchronous rectifier for minimal external part count and high efficiency. The ADP2138/ADP2139 have internal soft start and they are internally compensated. During logic controlled shutdown, the input is disconnected from the output and the ADP2138/ADP2139 draw 0.2 ?A (typical) from the input source.Other key features include undervoltage lockout to prevent deep battery discharge, and soft start to prevent input current overshoot at startup. The ADP2138/ADP2139 are available in a 6-ball wafer level chip scale package (WLCSP).Applications PDAs and palmtop computers Wireless handsets Digital audio, portable media players Digital cameras, GPS navigation units
ADP2138CB-1.8EVALZ
Analog Devices Inc.The ADP2138 and ADP2139 are high efficiency, low quiescent current, synchronous step-down dc-to-dc converters. The ADP2139 has the additional feature of an internal discharge switch. The total solution requires only three tiny external components. When the MODE pin is set high, the buck regulator operates in forced PWM mode, which provides low peak-to-peak ripple for power supply noise sensitive loads at the expense of light load efficiency. When the MODE pin is set low, the buck regulator automatically switches operating modes, depending on the load current level. At higher output loads, the buck regulator operates in PWM mode. When the load current falls below a predefined threshold, the regulator operates in power save mode (PSM), improving light load efficiency.The ADP2138/ADP2139 operate on input voltages of 2.3 V to 5.5 V, which allows for single lithium or lithium polymer cell, multiple alkaline or NiMH cell, PCMCIA, USB, and other standard power sources. The maximum load current of 800 mA is achievable across the input voltage range.The ADP2138/ADP2139 are available in fixed output voltages of 3.3 V, 3.0 V, 2.8 V, 2.5 V, 1.8 V, 1.5 V, 1.2 V, 1.0 V, and 0.8 V. All versions include an internal power switch and synchronous rectifier for minimal external part count and high efficiency. The ADP2138/ADP2139 have internal soft start and they are internally compensated. During logic controlled shutdown, the input is disconnected from the output and the ADP2138/ADP2139 draw 0.2 ?A (typical) from the input source.Other key features include undervoltage lockout to prevent deep battery discharge, and soft start to prevent input current overshoot at startup. The ADP2138/ADP2139 are available in a 6-ball wafer level chip scale package (WLCSP).Applications PDAs and palmtop computers Wireless handsets Digital audio, portable media players Digital cameras, GPS navigation units
ADP2138CB-2.5EVALZ
Analog Devices Inc.The ADP2138 and ADP2139 are high efficiency, low quiescent current, synchronous step-down dc-to-dc converters. The ADP2139 has the additional feature of an internal discharge switch. The total solution requires only three tiny external components. When the MODE pin is set high, the buck regulator operates in forced PWM mode, which provides low peak-to-peak ripple for power supply noise sensitive loads at the expense of light load efficiency. When the MODE pin is set low, the buck regulator automatically switches operating modes, depending on the load current level. At higher output loads, the buck regulator operates in PWM mode. When the load current falls below a predefined threshold, the regulator operates in power save mode (PSM), improving light load efficiency.The ADP2138/ADP2139 operate on input voltages of 2.3 V to 5.5 V, which allows for single lithium or lithium polymer cell, multiple alkaline or NiMH cell, PCMCIA, USB, and other standard power sources. The maximum load current of 800 mA is achievable across the input voltage range.The ADP2138/ADP2139 are available in fixed output voltages of 3.3 V, 3.0 V, 2.8 V, 2.5 V, 1.8 V, 1.5 V, 1.2 V, 1.0 V, and 0.8 V. All versions include an internal power switch and synchronous rectifier for minimal external part count and high efficiency. The ADP2138/ADP2139 have internal soft start and they are internally compensated. During logic controlled shutdown, the input is disconnected from the output and the ADP2138/ADP2139 draw 0.2 ?A (typical) from the input source.Other key features include undervoltage lockout to prevent deep battery discharge, and soft start to prevent input current overshoot at startup. The ADP2138/ADP2139 are available in a 6-ball wafer level chip scale package (WLCSP).Applications PDAs and palmtop computers Wireless handsets Digital audio, portable media players Digital cameras, GPS navigation units
ADP2139CB-3.3EVALZ
Analog Devices Inc.The ADP2138 and ADP2139 are high efficiency, low quiescent current, synchronous step-down dc-to-dc converters. The ADP2139 has the additional feature of an internal discharge switch. The total solution requires only three tiny external components. When the MODE pin is set high, the buck regulator operates in forced PWM mode, which provides low peak-to-peak ripple for power supply noise sensitive loads at the expense of light load efficiency. When the MODE pin is set low, the buck regulator automatically switches operating modes, depending on the load current level. At higher output loads, the buck regulator operates in PWM mode. When the load current falls below a predefined threshold, the regulator operates in power save mode (PSM), improving light load efficiency.The ADP2138/ADP2139 operate on input voltages of 2.3 V to 5.5 V, which allows for single lithium or lithium polymer cell, multiple alkaline or NiMH cell, PCMCIA, USB, and other standard power sources. The maximum load current of 800 mA is achievable across the input voltage range.The ADP2138/ADP2139 are available in fixed output voltages of 3.3 V, 3.0 V, 2.8 V, 2.5 V, 1.8 V, 1.5 V, 1.2 V, 1.0 V, and 0.8 V. All versions include an internal power switch and synchronous rectifier for minimal external part count and high efficiency. The ADP2138/ADP2139 have internal soft start and they are internally compensated. During logic controlled shutdown, the input is disconnected from the output and the ADP2138/ADP2139 draw 0.2 ?A (typical) from the input source.Other key features include undervoltage lockout to prevent deep battery discharge, and soft start to prevent input current overshoot at startup. The ADP2138/ADP2139 are available in a 6-ball wafer level chip scale package (WLCSP).Applications PDAs and palmtop computers Wireless handsets Digital audio, portable media players Digital cameras, GPS navigation units
ADP2230CP-EVALZ
Analog Devices Inc.The ADP2230 includes two high efficiency, low quiescent current, 800 mA, step-down, dc-to-dc converters in a small, 10-lead, 3 mm ? 3 mm, LFCSP package. The total solution requires only five tiny external components. When the ADP2230 is used with three 0603 capacitors and two 2 mm ? 2 mm inductors, the total solution size is about 48 mm2, resulting in the smallest footprint solution to meet a variety of portable applications. The ADP2230 buck regulator uses a proprietary, high speed, current mode, constant frequency, PWM control scheme for excellent stability and transient response. The buck outputs operate out of phase to reduce the input current ripple. To ensure the longest battery life in portable applications, the ADP2230 has a power saving variable frequency mode that reduces the switching frequency under light load conditions. During logic controlled shutdown, the input is disconnected from the output, and it draws less than 0.1 ?A from the input source. The ADP2230 operates from input voltages from 2.3 V to 6.5 V, allowing the use of multiple alkaline, NiMH, or lithium cells and other standard power sources.The ADP2230 offers multiple options for setting the operating frequency. To maximize light load efficiency, the ADP2230 can operate at a reduced switching frequency in PSM and switch automatically to PWM as the load increases. The ADP2230 can be forced to operate at 2 MHz in PWM only mode when noise considerations are more important than efficiency. The ADP2230 can also be synchronized with a 1.5 MHz to 2.5 MHz external clock via the SYNC pin. When using the external clock synchronization control, both buck outputs operate in phase with the applied clock signal.The ADP2230 includes an internal power switch, synchronous rectifier, and compensation to minimize external part count and maximize efficiency. Other key protection features include undervoltage lockout to prevent deep battery discharge, internal soft start to prevent input current overshoot at startup, and an integrated, switched resistor, QOD function that automatically discharges the output when the device is disabled. Short-circuit protection and thermal overload protection circuits prevent damage in adverse conditions. Applications Portable and battery-powered equipment Automatic meter readers (WSN) Point of sales and transaction processing instruments Mobile phones Digital cameras and audio devices Medical instruments Medium format display tablets and pads
ADP2303-EVALZ
Analog Devices Inc.The ADP2302 / ADP2303 are fixed frequency, current-mode control, step-down, dc-to-dc regulators with an integratedpower MOSFET. The ADP2302 / ADP2303 can run from an input voltage of 3.0 V to 20 V, which makes them suitable for awide range of applications. The output voltage of the ADP2302 / ADP2303 can be down to 0.8 V for the adjustable version, whilethe fixed output version is available in preset output voltage options of 5.0 V, 3.3 V, and 2.5 V. The 700 kHz operatingfrequency allows small inductor and ceramic capacitors to be used, providing a compact solution. Current mode controlprovides fast and stable line and load transient performance. The ADP2302/ADP2303 have integrated soft start circuitry toprevent a large inrush current at power-up. The power-good signal can be used to sequence devices that have an enable input.The precision enable threshold voltage allows the part to be easily sequenced from other input/output supplies. Other keyfeatures include undervoltage lockout (UVLO), overvoltage protection (OVP), thermal shutdown (TSD), and overcurrentprotection (OCP).The ADP2302 / ADP2303 devices are available in the 8-lead, SOIC package with exposed paddle and are rated for the ?40oCto +125oC junction temperature range.APPLICATIONS Intermediate power rail conversion DC-to-DC point of load applications Communications and networking equipment Industrial and instrumentation Consumer electronics Healthcare and Medical
ADP2325-EVALZ
Analog Devices Inc.The ADP2325 is a full featured, dual output, step-down dc-to-dcregulator based on a current mode architecture. The ADP2325integrates two high-side power MOSFETs and two low-side driversfor the external N-channel MOSFETs. The two pulse-width modulation(PWM) channels can be configured to deliver dual 5 Aoutputs or a parallel-to-single 10 A output. The regulator operatesfrom input voltages of 4.5 V to 20 V, and the output voltage canbe as low as 0.6 V.The switching frequency can be programmed between 250 kHzand 1.2 MHz, or synchronized to an external clock to minimizeinterference in multirail applications. The dual PWM channelsrun 180? out of phase, thereby reducing input current ripple aswell as reducing the size of the input capacitor.The bidirectional synchronization pin can be programmed ata 60?, 90?, or 120? phase shift, providing the possibility for astackable multiphase power solution.The ADP2325 can be set to operate in pulse frequency modulation(PFM) mode at a light load for higher efficiency or in forcedPWM for noise sensitive applications. External compensationand soft start provide design flexibility. Independent enableinputs and power-good outputs provide reliable power sequencing.To enhance system reliability, the device includes undervoltagelockout (UVLO), overvoltage protection (OVP), overcurrent protection,and thermal shutdown.The ADP2325 operates over the ?40?C to +125?C junctiontemperature range and is available in a 32-lead LFCSP_WQpackage.Applications Communications infrastructure Networking and servers Industrial and instrumentation Healthcare and medical Intermediate power rail conversion
ADP2370CPZ-REDYKIT
Analog Devices Inc.The ADP2370/ADP2371 are high efficiency, low quiescent current, 800 mA buck (step-down) dc-to-dc converters in small 8-lead, 3 mm ? 3 mm LFCSP (QFN) packages. The total solution requires only three tiny external components.The buck regulator uses a proprietary high speed current mode, constant frequency PWM control scheme for excellent stability and transient response. The need for an external rectifier is eliminated by using a high efficiency synchronous rectifier architecture.To ensure the longest battery life in portable applications, the ADP2370/ADP2371 employ a power saving variable frequency mode that reduces the switching frequency under light load conditions. The ADP2370/ADP2371 operate from input voltages of 3.2 V to 15 V allowing the use of multiple alkaline/NiMH, lithium cells, or other standard power sources.The ADP2370/ADP2371 offer multiple options for setting the operational frequency. The ADP2370/ADP2371 can be synchronized to a 600 kHz to 1.2 MHz external clock or it can be forced to operate at 600 kHz or 1.2 MHz via the FSEL pin. The ADP2370/ ADP2371 can be forced to operate in PWM mode (FPWM) when noise considerations are more important than efficiency.A power-good output is available to indicate when the output voltage is below 92% of its nominal value.The ADP2371 is identical to the ADP2370 except that the ADP2371 includes the addition of an integrated switched resistor, quick output discharge function (QOD) that automatically discharges the output when the device is disabled.Both devices include an internal power switch and a synchronous rectifier for minimal external part count and high efficiency. The ADP2370/ADP2371 also include internal soft start and internal compensation for ease of use.During a logic controlled shutdown, the input is disconnected from the output and the regulator draws less than 1.2 ?A from the input source. Other key features include undervoltage lockout to prevent deep battery discharge and soft start to prevent input overcurrent at startup. Short-circuit protection and thermal overload protection circuits prevent damage under adverse conditions.The ADP2370/ADP2371 each use one 0805 capacitor, one 1206 capacitor, and one 4 mm ? 4 mm inductor. The total solution size is about 53 mm2 resulting in a very small footprint solution to meet a variety of portable applications. APPLICATIONS Portable and battery-powered equipment Automatic meter readers (WSN) Point of sales and transaction processing instruments Medical instruments Medium format display tablets and pads
ADP2442-EVALZ
Analog Devices Inc.The?ADP2441 / ADP2442 is a constant frequency, current mode control,synchronous, step-down, dc-to-dc regulator that is capable ofdriving loads of up to 1 A with excellent line and load regulationcharacteristics. The ADP2442 operates with a wide input voltagerange from 4.5 V to 36 V, which makes it ideal for regulating powerfrom a wide variety of sources. In addition, the ADP2442 hasvery low minimum on time (50 ns) and is, therefore, suitable forapplications requiring a very high step-down ratio.The output voltage can be adjusted from 0.6 V to 0.9 ? VIN.High efficiency is obtained with integrated low resistanceN-channel MOSFETs for both high-side and low-side devices.The switching frequency is adjustable from 300 kHz to 1 MHz withan external resistor. The ADP2442 also has an accurate power-good(PGOOD) open-drain output signal.The ADP2442 offers the flexibility of external clock synchronization.The switching frequency can be synchronized to an externalclock, applied to the SYNC/MODE pin. The ADP2442 can alsobe configured to operate in the forced fixed frequency mode forlow EMI or power saving mode to reduce the switching losses atlight load.The ADP2442 uses hiccup mode to protect the IC from shortcircuits or from overcurrent conditions on the output. The internalsoft start limits inrush current during startup for a wide variety ofload capacitances. Other key features include input undervoltagelockout (UVLO), thermal shutdown (TSD), and precision enable(EN), which can also be used as a logic level shutdown input.The ADP2442 is available in a 3 mm ? 3 mm, 12-lead LFCSPpackage and is rated for a junction temperature range from?40?C to +125?C.APPLICATIONS Point of load applications Distributed power systems Industrial control supplies Standard rail conversion to 24 V/12 V/5 V/3.3 V
ADP2503CPZ-REDYKIT
Analog Devices Inc.The ADP2503 /?ADP2504 are high efficiency, low quiescent current step-up/step-down dc-to-dc converters that can operate at input voltages greater than, less than, or equal to the regulated output voltage. The power switches and synchronous rectifiers are internal to minimize external part count. At high load currents, the ADP2503 / ADP2504 use a current-mode, fixed frequency pulse-width modulation (PWM) control scheme for optimal stability and transient response. To ensure the longest battery life in portable applications, the ADP2503 / ADP2504 have an optional power save mode that reduces the switching frequency under light load conditions. For wireless and other low noise applications where variable frequency power save mode may cause interference, the logic control input sync forces fixed frequency PWM operation under all load conditions.The ADP2503 / ADP2504 can run from input voltages between 2.3 V and 5.5 V, allowing single lithium or lithium polymer cell, multiple alkaline or NiMH cells, PCMCIA, USB, and other standard power sources. The ADP2503 / ADP2504 have fixed output options, or using the adjustable model, the output voltage can be programmed through an external resistor divider. Compensation is internal to minimize the number of external components.During logic-controlled shutdown, the input is disconnected from the output and draws less than 1 ?A from the input source. Operating as boost converters, the ADP2503 / ADP2504 feature a true load disconnect function that isolates the load from the power source. Other key features include undervoltage lockout to prevent deep battery discharge, and soft start to prevent input current overshoot at startup.APPLICATIONS Wireless handsets Digital cameras/portable audio players Miniature hard disk power supplies USB powered devices
