4.5A, 500kHz Step-Down Switching Regulator Features: Constant 500kHz Switching Frequency Easily Synchronizable Operates with Input as Low as 4V Uses All Surface Mount Components Inductor Size Reduced to 1.8µH Saturating Switch Design: 0.07Ω Shutdown Current: 20µA Cycle-by-Cycle Current Limiting

4.5A, 500kHz Step-Down Switching Regulator Features: Constant 500kHz Switching Frequency Easily Synchronizable Operates with Input as Low as 4V Uses All Surface Mount Components Inductor Size Reduced to 1.8µH Saturating Switch Design: 0.07Ω Shutdown Current: 20µA Cycle-by-Cycle Current Limiting

4.5A, 500kHz Step-Down Switching Regulator Features: Constant 500kHz Switching Frequency Easily Synchronizable Operates with Input as Low as 4V Uses All Surface Mount Components Inductor Size Reduced to 1.8µH Saturating Switch Design: 0.07Ω Shutdown Current: 20µA Cycle-by-Cycle Current Limiting

Power Factor and PWM Controller Features: PFC and PWM Single Chip Solution Synchronized Operation up to 300kHz 99% Power Factor over 20:1 Load Current Range Current Mode PWM Instantaneous Overvoltage Protection Dedicated Overvoltage Protection (OVP Pin) Minimal Line Current Dead Zone Typical 250µA Start-Up Supply Current Line Switching Noise Filter Low Quiescent Current: 13mA Fast 2A Peak Current Gate Drivers Separate Soft Start Controls

Power Factor and PWM Controller Features: PFC and PWM Single Chip Solution Synchronized Operation up to 300kHz 99% Power Factor over 20:1 Load Current Range Current Mode PWM Instantaneous Overvoltage Protection Dedicated Overvoltage Protection (OVP Pin) Minimal Line Current Dead Zone Typical 250µA Start-Up Supply Current Line Switching Noise Filter Low Quiescent Current: 13mA Fast 2A Peak Current Gate Drivers Separate Soft Start Controls

Constant-Voltage/Constant-Current Battery Charger Features: Charges NiCd, NiMH and Lithium-Ion Batteries - Only One 1/10W Resistor Is Needed to Program Charging Current High Efficiency Current Mode PWM with 1.5A Internal Switch and Sense Resistor 3% Typical Charging Current Accuracy Precision 0.5% Voltage Reference for Voltage Mode Charging or Overvoltage Protection Current Sensing Can Be at Either Terminal of the Battery Low Reverse Battery Drain Current: 3µA Charging Current Soft Start Shutdown Control 500kHz Version Uses Small Inductor

SEPIC Constant-Current/Constant-Voltage Battery Charger Features: Charger Input Voltage May Be Higher, Equal to or Lower Than Battery Voltage Charges Any Number of Cells Up to 30V* 1% Voltage Accuracy for Rechargeable Lithium Batteries 500kHz Switching Frequency Minimizes Inductor Size 100mV Current Sense Voltage for High Efficiency Battery Can Be Directly Grounded Charging Current Easily Programmable or Shut Down*Maximum Input Voltage = 40V VBAT

SEPIC Constant- or Programmable-Current/Constant-Voltage Battery Charger Features: Charger Input Voltage May Be Higher, Equal to or Lower Than Battery Voltage Charges Any Number of Cells Up to 20V 1% Voltage Accuracy for Rechargeable Lithium Batteries 100mV Current Sense Voltage for High Efficiency (LT1513) 0mV Current Sense Voltage for Easy Current Programming (LT1513-2) Battery Can Be Directly Grounded 500kHz Switching Frequency Minimizes Inductor Size Charging Current Easily Programmable or Shut Down

300mA Low Dropout Regulators with Micropower Quiescent Current and Shutdown Features: Dropout Voltage: 0.5V Output Current: 300mA Quiescent Current: 12µA No Protection Diodes Needed Adjustable Output from 3.8V to 20V Fixed Output Voltages: 3V, 3.3V, 5V Controlled Quiescent Current in Dropout Shutdown IQ = 6µA Reverse Battery Protection No Reverse Current Thermal Limiting

300mA Low Dropout Regulators with Micropower Quiescent Current and Shutdown Features: Dropout Voltage: 0.5V Output Current: 300mA Quiescent Current: 12µA No Protection Diodes Needed Adjustable Output from 3.8V to 20V Fixed Output Voltages: 3V, 3.3V, 5V Controlled Quiescent Current in Dropout Shutdown IQ = 6µA Reverse Battery Protection No Reverse Current Thermal Limiting

300mA Low Dropout Regulators with Micropower Quiescent Current and Shutdown Features: Dropout Voltage: 0.5V Output Current: 300mA Quiescent Current: 12µA No Protection Diodes Needed Adjustable Output from 3.8V to 20V Fixed Output Voltages: 3V, 3.3V, 5V Controlled Quiescent Current in Dropout Shutdown IQ = 6µA Reverse Battery Protection No Reverse Current Thermal Limiting

300mA Low Dropout Regulators with Micropower Quiescent Current and Shutdown Features: Dropout Voltage: 0.5V Output Current: 300mA Quiescent Current: 12µA No Protection Diodes Needed Adjustable Output from 3.8V to 20V Fixed Output Voltages: 3V, 3.3V, 5V Controlled Quiescent Current in Dropout Shutdown IQ = 6µA Reverse Battery Protection No Reverse Current Thermal Limiting

300mA Low Dropout Regulators with Micropower Quiescent Current and Shutdown Features: Dropout Voltage: 0.5V Output Current: 300mA Quiescent Current: 12µA No Protection Diodes Needed Adjustable Output from 3.8V to 20V Fixed Output Voltages: 3V, 3.3V, 5V Controlled Quiescent Current in Dropout Shutdown IQ = 6µA Reverse Battery Protection No Reverse Current Thermal Limiting

3A Low Dropout Regulators with Micropower Quiescent Current and Shutdown Features: Dropout Voltage: 0.6V at IOUT = 3A Output Current: 3A Quiescent Current: 50µA No Protection Diodes Needed Adjustable Output from 3.8V to 14V 3.3V and 5V Fixed Output Voltages Controlled Quiescent Current in Dropout Shutdown IQ = 16µA Stable with 22µF Output Capacitor Reverse Battery Protection No Reverse Current Thermal Limiting

Very Low Noise, High Frequency Active RC, Filter Building Block Features: Up to 10MHz Center Frequency on a Single 3V Supply Easy to Use—A Single Resistor Value Sets Lowpass Cutoff Frequency (200kHz <  fC < 5MHz), Unequal Resistor Values Extend Cutoff Frequency Up to 10MHz Extremely Flexible—Different Resistor Values Allow Lowpass Transfer Functions with or Without Gain SNR = 92dB (fC = 2MHz, 2VP-P) THD = –84dB (fC = 2MHz, 1VP-P) Internal Capacitors Trimmed to ±0.75% Single 4-Pole Lowpass Filter or Matched Pair of 2-Pole Lowpass Filters Can be Connected as a Bandpass Filter Single-Ended or Differential Output Operates from Single 3V (2.7V Min) to ±5V Supply Rail-to-Rail Input and Output Voltages

Very Low Noise, High Frequency Active RC, Filter Building Block Features: Up to 10MHz Center Frequency on a Single 3V Supply Easy to Use—A Single Resistor Value Sets Lowpass Cutoff Frequency (200kHz <  fC < 5MHz), Unequal Resistor Values Extend Cutoff Frequency Up to 10MHz Extremely Flexible—Different Resistor Values Allow Lowpass Transfer Functions with or Without Gain SNR = 92dB (fC = 2MHz, 2VP-P) THD = –84dB (fC = 2MHz, 1VP-P) Internal Capacitors Trimmed to ±0.75% Single 4-Pole Lowpass Filter or Matched Pair of 2-Pole Lowpass Filters Can be Connected as a Bandpass Filter Single-Ended or Differential Output Operates from Single 3V (2.7V Min) to ±5V Supply Rail-to-Rail Input and Output Voltages

Constant-Current/Constant-Voltage Battery Charger with Preset Voltage and Termination Flag Features: Fast Charging of Li-Ion, NiMH and NiCd Batteries Simple Charge Current Programming Requires Only One Low Cost, 1/32W Resistor High Efficiency Charger with Up to 1.5A Charge Current Precision 0.6% Internal Voltage Reference Preset Battery Voltages: 4.1V, 4.2V, 8.2V, 8.4V 500kHz or 200kHz Switching Frequency Minimizes Charger Size Low Reverse Battery Drain Current: 5µA Flag Indicates Li-Ion Charge Completion 5% Typical Charge Current Accuracy Low Shutdown Current LT1571-1: 200kHz, Adjustable Voltage LT1571-2: 200kHz, Fixed 8.2V or 8.4V LT1571-5: 500kHz, Fixed 4.1V or 4.2V

Ultrafast Transient Response, Low Dropout Regulators Adjustable and Fixed Features: UltraFast™ Transient Response Eliminates Tantalum and Electrolytic Output Capacitors FET RDS(ON) Defines Dropout Voltage 1% Reference/Output Voltage Tolerance Temperature Typical Load Regulation: 1mV High Side Sense Current Limit Multifunction Shutdown Pin with Latch off

Ultrafast Transient Response, Low Dropout Regulators Adjustable and Fixed Features: UltraFast™ Transient Response Eliminates Tantalum and Electrolytic Output Capacitors FET RDS(ON) Defines Dropout Voltage 1% Reference/Output Voltage Tolerance Temperature Typical Load Regulation: 1mV High Side Sense Current Limit Multifunction Shutdown Pin with Latch off

Ultrafast Transient Response, Low Dropout Regulators Adjustable and Fixed Features: UltraFast™ Transient Response Eliminates Tantalum and Electrolytic Output Capacitors FET RDS(ON) Defines Dropout Voltage 1% Reference/Output Voltage Tolerance Temperature Typical Load Regulation: 1mV High Side Sense Current Limit Multifunction Shutdown Pin with Latch off