Dual Wide Range Power Monitor Features: Rail-to-Rail Input Range: 0V to 100V Wide Input Supply Range: 2.7V to 100V Measures Current, Voltage, and Power Shunt Regulator for Supplies >100V 8-/12-Bit ADCs with Less Than ±0.3% Total Unadjusted Error Four General Purpose Inputs/Outputs Configurable as ADC Inputs Continuous Scan and Snapshot Modes Stores Minimum and Maximum Measurements Alerts When Alarm Thresholds Exceeded Shutdown Mode with IQ < 50μA Split SDA Pin Eases Opto-Isolation Available in 16-Lead 4mm × 3mm DFN and MSOP Packages

Dual Wide Range Power Monitor Features: Rail-to-Rail Input Range: 0V to 100V Wide Input Supply Range: 2.7V to 100V Measures Current, Voltage, and Power Shunt Regulator for Supplies >100V 8-/12-Bit ADCs with Less Than ±0.3% Total Unadjusted Error Four General Purpose Inputs/Outputs Configurable as ADC Inputs Continuous Scan and Snapshot Modes Stores Minimum and Maximum Measurements Alerts When Alarm Thresholds Exceeded Shutdown Mode with IQ < 50μA Split SDA Pin Eases Opto-Isolation Available in 16-Lead 4mm × 3mm DFN and MSOP Packages

Temperature Sensor and Dual Voltage Monitor with Alert Outputs Features:Monitors Temperature and Two VoltagesVoltage Output Proportional to TemperatureAdjustable Thresholds for Temperature and Voltage±1°C Remote Temperature Accuracy±2°C Internal Temperature Accuracy±1.5% Voltage Threshold Accuracy3.5ms Update Time2.25V to 5.5V Supply VoltageInput Glitch RejectionAdjustable Reset Timeout220μA Quiescent CurrentOpen Drain Alert OutputsAvailable in 3mm × 3mm QFN Package

Temperature Sensor and Dual Voltage Monitor with Alert Outputs Features:Monitors Temperature and Two VoltagesVoltage Output Proportional to TemperatureAdjustable Thresholds for Temperature and Voltage±1°C Remote Temperature Accuracy±2°C Internal Temperature Accuracy±1.5% Voltage Threshold Accuracy3.5ms Update Time2.25V to 5.5V Supply VoltageInput Glitch RejectionAdjustable Reset Timeout220μA Quiescent CurrentOpen Drain Alert OutputsAvailable in 3mm × 3mm QFN Package

Temperature Sensor with Alert Outputs Features:Converts Remote or Internal Diode Temperature to Analog VoltageAdjustable Overtemperature and Undertemperature ThresholdsVoltage Output Proportional to Temperature±1°C Remote Temperature Accuracy±2°C Internal Temperature AccuracyBuilt-In Series Resistance CancellationOpen Drain Alert Outputs2.25V to 5.5V Supply Voltage1.8V Reference Voltage Output200μA Quiescent Current10-Lead 3mm × 3mm DFN Package

60V PolyPhase Synchronous Boost Controller with PassThru Features:PolyPhase® Operation Reduces Required Input and Output Capacitance and Power Supply Induced NoiseSynchronous Operation for Highest Efficiency and Reduced Heat DissipationWide VIN Range: 4.5V to 60V (65V Abs Max); Operates Down to 2.3V After Start-UpOutput Voltage Up to 60V±1% 1.200V Reference VoltageRSENSE or Inductor DCR Current Sensing100% Duty Cycle Capability for Synchronous MOSFETLow Quiescent Current: 28μAPhase-Lockable Frequency (75kHz to 850kHz)Programmable Fixed Frequency (50kHz to 900kHz)Power Good Output Voltage MonitorLow Shutdown Current, IQ < 4μAInternal LDO Powers Gate Drive from VBIAS or EXTVCCThermally Enhanced Low Profile 28-Pin 4mm × 5mm QFN Package and Narrow SSOP Package

60V PolyPhase Synchronous Boost Controller with PassThru Features:PolyPhase® Operation Reduces Required Input and Output Capacitance and Power Supply Induced NoiseSynchronous Operation for Highest Efficiency and Reduced Heat DissipationWide VIN Range: 4.5V to 60V (65V Abs Max); Operates Down to 2.3V After Start-UpOutput Voltage Up to 60V±1% 1.200V Reference VoltageRSENSE or Inductor DCR Current Sensing100% Duty Cycle Capability for Synchronous MOSFETLow Quiescent Current: 28μAPhase-Lockable Frequency (75kHz to 850kHz)Programmable Fixed Frequency (50kHz to 900kHz)Power Good Output Voltage MonitorLow Shutdown Current, IQ < 4μAInternal LDO Powers Gate Drive from VBIAS or EXTVCCThermally Enhanced Low Profile 28-Pin 4mm × 5mm QFN Package and Narrow SSOP Package

PolyPhase Synchronous Boost Controller with PassThru Features: 2-Phase Operation Reduces Required Input and Output Capacitance and Power Supply Induced Noise Synchronous Operation for Highest Efficiency and Reduced Heat Dissipation Wide VIN Range: 4.5V to 38V (40V Abs Max) and Operates Down to 2.5V After Start-Up Output Voltage Up to 60V ±1% 1.200V Reference Voltage RSENSE or Inductor DCR Current Sensing 100% Duty Cycle Capability for Synchronous MOSFET Low Quiescent Current: 135μA Phase-Lockable Frequency (75kHz to 850kHz) Programmable Fixed Frequency (50kHz to 900kHz) Power Good Output Voltage Monitor Low Shutdown Current, IQ < 8μA Internal LDO Powers Gate Drive from VBIAS or EXTVCC Thermally Enhanced Low Profile 28-Pin 4mm × 5mm QFN Package and Narrow SSOP Package 

PolyPhase Synchronous Boost Controller with PassThru Features: 2-Phase Operation Reduces Required Input and Output Capacitance and Power Supply Induced Noise Synchronous Operation for Highest Efficiency and Reduced Heat Dissipation Wide VIN Range: 4.5V to 38V (40V Abs Max) and Operates Down to 2.5V After Start-Up Output Voltage Up to 60V ±1% 1.200V Reference Voltage RSENSE or Inductor DCR Current Sensing 100% Duty Cycle Capability for Synchronous MOSFET Low Quiescent Current: 135μA Phase-Lockable Frequency (75kHz to 850kHz) Programmable Fixed Frequency (50kHz to 900kHz) Power Good Output Voltage Monitor Low Shutdown Current, IQ < 8μA Internal LDO Powers Gate Drive from VBIAS or EXTVCC Thermally Enhanced Low Profile 28-Pin 4mm × 5mm QFN Package and Narrow SSOP Package 

PolyPhase Synchronous Boost Controller with PassThru Features: 2-Phase Operation Reduces Required Input and Output Capacitance and Power Supply Induced Noise Synchronous Operation for Highest Efficiency and Reduced Heat Dissipation Wide VIN Range: 4.5V to 38V (40V Abs Max) and Operates Down to 2.5V After Start-Up Output Voltage Up to 60V ±1% 1.200V Reference Voltage RSENSE or Inductor DCR Current Sensing 100% Duty Cycle Capability for Synchronous MOSFET Low Quiescent Current: 135μA Phase-Lockable Frequency (75kHz to 850kHz) Programmable Fixed Frequency (50kHz to 900kHz) Power Good Output Voltage Monitor Low Shutdown Current, IQ < 8μA Internal LDO Powers Gate Drive from VBIAS or EXTVCC Thermally Enhanced Low Profile 28-Pin 4mm × 5mm QFN Package and Narrow SSOP Package 

PolyPhase Synchronous Boost Controller with PassThru Features: 2-Phase Operation Reduces Required Input and Output Capacitance and Power Supply Induced Noise Synchronous Operation for Highest Efficiency and Reduced Heat Dissipation Wide VIN Range: 4.5V to 38V (40V Abs Max) and Operates Down to 2.5V After Start-Up Output Voltage Up to 60V ±1% 1.200V Reference Voltage RSENSE or Inductor DCR Current Sensing 100% Duty Cycle Capability for Synchronous MOSFET Low Quiescent Current: 135μA Phase-Lockable Frequency (75kHz to 850kHz) Programmable Fixed Frequency (50kHz to 900kHz) Power Good Output Voltage Monitor Low Shutdown Current, IQ < 8μA Internal LDO Powers Gate Drive from VBIAS or EXTVCC Thermally Enhanced Low Profile 28-Pin 4mm × 5mm QFN Package and Narrow SSOP Package 

2-Phase, Dual Output Synchronous Boost Controller Features: Synchronous Operation for Highest Efficiency and Reduced Heat Dissipation Wide Input Range: 4.5V to 38V (40V Abs Max) and Operates Down to 2.5V After Start-Up Output Voltages Up to 60V ±1% 1.2V Reference Voltage RSENSE or Inductor DCR Current Sensing 100% Duty Cycle Capability for Synchronous MOSFET Low Quiescent Current: 125μA Phase-Lockable Frequency (75kHz to 850kHz) Programmable Fixed Frequency (50kHz to 900kHz) Adjustable Output Voltage Soft-Start Power Good Output Voltage Monitor Low Shutdown Current IQ: <8μA Internal LDO Powers Gate Drive from VBIAS or EXTVCC Available in a Narrow SSOP Package

2-Phase, Dual Output Synchronous Boost Controller Features: Synchronous Operation for Highest Efficiency and Reduced Heat Dissipation Wide Input Range: 4.5V to 38V (40V Abs Max) and Operates Down to 2.5V After Start-Up Output Voltages Up to 60V ±1% 1.2V Reference Voltage RSENSE or Inductor DCR Current Sensing 100% Duty Cycle Capability for Synchronous MOSFET Low Quiescent Current: 125μA Phase-Lockable Frequency (75kHz to 850kHz) Programmable Fixed Frequency (50kHz to 900kHz) Selectable Current Limit Adjustable Output Voltage Soft-Start Power Good Output Voltage Monitors Low Shutdown Current IQ: <8μA Internal LDO Powers Gate Drive from VBIAS or EXTVCC Thermally Enhanced Low Profile 32-Pin 5mm × 5mm QFN Package

High Power Synchronous Switching Regulator Controller Features: High Power Buck Converter from 5V or 3.3V Input Adjustable Current Limit in S0-8 with Topside FET RDS(ON) Sensing No External Sense Resistor Required Hiccup Mode Current Limit Protection Adjustable, Fixed 1.9V, 2.5V, 2.8V and 3.3V Output All N-Channel MOSFET Synchronous Driver Excellent Output Regulation: ±2% over Line, Load and Temperature Variations High Efficiency: Over 95% Possible Fast Transient Response Fixed 300kHz Frequency Operation Internal Soft-Start Circuit Quiescent Current: 1mA; 45µA in Shutdown

Isolated RS485 Transceiver Features: UL Rated Isolated RS485: 2500VRMS  UL Recognized File #E151738 Eliminates Ground Loops 250kBd Maximum Data Rate Self-Powered with 420kHz Converter Half- or Full-Duplex Fail-Safe Output High for Open or Shorted Receiver Inputs Short-Circuit Current Limit Slow Slew Rate Control 68kΩ Input Impedance Allows Up to 128 Nodes Thermal Shutdown 8kV ESD Protection On Driver Outputs and Receiver Inputs Available in 28-Lead SW Package

Dual High Efficiency, Low Noise, Synchronous Step-Down Switching Regulators Features: Maintains Constant Frequency at Low Output Currents Dual N-Channel MOSFET Synchronous Drive Programmable Fixed Frequency (PLL Lockable) Wide VIN Range: 3.5V to 36V Operation Ultrahigh Efficiency Very Low Dropout Operation: 99% Duty Cycle Low Dropout, 0.5A Linear Regulator for VPP Generation or Low Noise Audio Supply Built-In Power-On Reset Timer Programmable Soft Start Low-Battery Detector Remote Output Voltage Sense Foldback Current Limiting (Optional) Pin Selectable Output Voltage 5V Standby Regulator Active in Shutdown: IQ < 200 µA Output Voltages from 1.19V to 9V Available in 28- and 36-Lead SSOP Packages

Micropower Op Amp, Comparator and Reference Features: Quiescent Current: 5µA Typ Outputs Swing Rail-to-Rail Low Op Amp Offset Voltage: 700µV Max Reference Output Drives 0.01µF Capacitor Internal 1.2V ±0.4% Reference Output (LTC1541) Low Input Bias Current: 1nA Max Reference Output Can Source Up to 2mA Internal ±2.25mV Comparator Hysteresis Comparator and Op Amp Input Range Includes Ground Op Amp Capable of Driving Up to 1000pF Load Unity-Gain Stable and 12kHz Bandwidth 2.5V to 12.6V Supply Voltage Range Pin Compatible Upgrade for MAX951/MAX953 Available in 3mm × 3mm × 0.8mm DFN Package

Micropower Op Amp, Comparator and Reference Features: Quiescent Current: 5µA Typ Outputs Swing Rail-to-Rail Low Op Amp Offset Voltage: 700µV Max Reference Output Drives 0.01µF Capacitor Internal 1.2V ±0.4% Reference Output (LTC1541) Low Input Bias Current: 1nA Max Reference Output Can Source Up to 2mA Internal ±2.25mV Comparator Hysteresis Comparator and Op Amp Input Range Includes Ground Op Amp Capable of Driving Up to 1000pF Load Unity-Gain Stable and 12kHz Bandwidth 2.5V to 12.6V Supply Voltage Range Pin Compatible Upgrade for MAX951/MAX953 Available in 3mm × 3mm × 0.8mm DFN Package

Software-Selectable Multiprotocol Transceiver Features: Software-Selectable Transceiver Supports: RS232, RS449, EIA530, EIA530-A, V.35, V.36, X.21 TUV/Detecon Inc. Certified NET1 and NET2 Compliant (Test Report No. NET2/102201/97) TBR2 Compliant (Test Report No. CTR2/022701/98) Software-Selectable Cable Termination Using the LTC1344A Complete DTE or DCE Port with LTC1544, LTC1344A Operates from Single 5V Supply

Software-Selectable Multiprotocol Transceiver Features: Software-Selectable Transceiver Supports: RS232, RS449, EIA530, EIA530-A, V.35, V.36, X.21 TUV/Detecon Inc. Certified NET1 and NET2 Compliant (Test Report No. NET2/071601/98) TBR2 Compliant (Test Report No. CTR2/071601/98) Software-Selectable Cable Termination Using the LTC1344A Complete DTE or DCE Port with LTC1543, LTC1344A Operates from Single 5V Supply with LTC1543