20V High Efficiency Nanopower Step-Down Regulator Features: 720nA Input IQ in Regulation (No Load), VIN = 4V 820nA Input IQ in Regulation (No Load), VIN = 20V 400nA Input IQ in UVLO 2.7V to 20V Input Operating Range Up to 50mA of Output Current Pin Selectable Output Voltages: 1.2V, 1.5V, 1.8V, 2.5V (LTC3388-1) 2.8V, 3.0V, 3.3V, 5.0V (LTC3388-3) High Efficiency Hysteretic Synchronous DC/DC Conversion Standby Mode Disables Buck Switching Available in 10-Lead MSE and 3mm × 3mm DFN Packages

20V High Efficiency Nanopower Step-Down Regulator Features: 720nA Input IQ in Regulation (No Load), VIN = 4V 820nA Input IQ in Regulation (No Load), VIN = 20V 400nA Input IQ in UVLO 2.7V to 20V Input Operating Range Up to 50mA of Output Current Pin Selectable Output Voltages: 1.2V, 1.5V, 1.8V, 2.5V (LTC3388-1) 2.8V, 3.0V, 3.3V, 5.0V (LTC3388-3) High Efficiency Hysteretic Synchronous DC/DC Conversion Standby Mode Disables Buck Switching Available in 10-Lead MSE and 3mm × 3mm DFN Packages

600mA, 1.2MHz Micropower Synchronous Boost Converters in ThinSOT Features: Up to 92% Efficiency Generates 3.3V at 100mA from a Single AA Cell Low Start-Up Voltage: 0.85V 1.2MHz Fixed Frequency Switching Internal Synchronous Rectifier 2.5V to 5V Output Range Automatic Burst Mode® Operation (LTC3400) Continuous Switching at Light Loads (LTC3400B) Logic Controlled Shutdown (<1µA) Antiringing Control Minimizes EMI Tiny External Components Low Profile (1mm) SOT-23 Package

1.5MHz, 600mA Synchronous Step-Down Regulator in ThinSOT Features: High Efficiency: Up to 96% 600mA Output Current at VIN = 3V 2.5V to 5.5V Input Voltage Range 1.5MHz Constant Frequency Operation No Schottky Diode Required Low Dropout Operation: 100% Duty Cycle Low Quiescent Current: 300µA 0.6V Reference Allows Low Output Voltages Shutdown Mode Draws <1µA Supply Current Current Mode Operation for Excellent Line and Load Transient Response Overtemperature Protected Low Profile (1mm) ThinSOT™ Package

Dual Synchronous 600mA, 1.5MHz Step-Down DC/DC Regulator Features: High Efficiency: Up to 96% Low Ripple (35mVP-P) Burst Mode Operation; IQ = 40μA 1.5MHz Constant Frequency Operation No Schottky Diodes Required Low RDS(ON) Internal Switches: 0.35Ω Current Mode Operation for Excellent Line and Load Transient Response Short-Circuit Protected Low Dropout Operation: 100% Duty Cycle Ultralow Shutdown Current: IQ < 1µA Output Voltages from 5V down to 0.6V Power-On Reset Output Externally Synchronizable Oscillator Optional External Soft-Start Small Thermally Enhanced MSOP and 3mm × 3mm DFN Packages

2.25MHz, 300mA Synchronous Step-Down Regulator in SC70 Features: High Efficiency: Up to 96% 300mA Output Current at VIN = 3V 380mA Minimum Peak Switch Current 2.5V to 5.5V Input Voltage Range 2.25MHz Constant Frequency Operation No Schottky Diode Required Low Dropout Operation: 100% Duty Cycle Stable with Ceramic Capacitors 0.8V Reference Allows Low Output Voltages Shutdown Mode Draws < 1μA Supply Current ±2% Output Voltage Accuracy Current Mode Operation for Excellent Line andLoad Transient Response Overtemperature Protected Available in Low Profile SC70 Package

2.25MHz, 300mA Synchronous Step-Down Regulator in SC70 Features: High Efficiency: Up to 96% Low Ripple (20mVP-P) Burst Mode Operation: IQ 26µA Low Output Voltage Ripple 300mA Output Current at VIN = 3V 380mA Minimum Peak Switch Current 2.5V to 5.5V Input Voltage Range 2.25MHz Constant Frequency Operation No Schottky Diode Required Low Dropout Operation: 100% Duty Cycle Stable with Ceramic Capacitors 0.8V Reference Allows Low Output Voltages Shutdown Mode Draws < 1µA Supply Current ±2% Output Voltage Accuracy Current Mode Operation for Excellent Line and Load Transient Response Overtemperature Protected Available in Low Profile SC70 Package

2.25MHz, 300mA Synchronous Step-Down Regulator in SC70 Features: High Efficiency: Up to 96% Low Ripple (20mVP-P) Burst Mode Operation: IQ 26µA Low Output Voltage Ripple 300mA Output Current at VIN = 3V 380mA Minimum Peak Switch Current 2.5V to 5.5V Input Voltage Range 2.25MHz Constant Frequency Operation No Schottky Diode Required Low Dropout Operation: 100% Duty Cycle Stable with Ceramic Capacitors 0.8V Reference Allows Low Output Voltages Shutdown Mode Draws < 1µA Supply Current ±2% Output Voltage Accuracy Current Mode Operation for Excellent Line and Load Transient Response Overtemperature Protected Available in Low Profile SC70 Package

2.25MHz, 300mA Synchronous Step-Down Regulator in SC70 Features: High Efficiency: Up to 96% Low Ripple (20mVP-P) Burst Mode Operation: IQ 26µA Low Output Voltage Ripple 300mA Output Current at VIN = 3V 380mA Minimum Peak Switch Current 2.5V to 5.5V Input Voltage Range 2.25MHz Constant Frequency Operation No Schottky Diode Required Low Dropout Operation: 100% Duty Cycle Stable with Ceramic Capacitors 0.8V Reference Allows Low Output Voltages Shutdown Mode Draws < 1µA Supply Current ±2% Output Voltage Accuracy Current Mode Operation for Excellent Line and Load Transient Response Overtemperature Protected Available in Low Profile SC70 Package

1.25A, 4MHz, Synchronous Step-Down DC/DC Converter Features: Small 10-Lead MSOP or DFN Package Uses Tiny Capacitors and Inductor High Frequency Operation: Up to 4MHz High Switch Current: 1.6A Low RDS(ON) Internal Switches: 0.110Ω High Efficiency: Up to 95% Stable with Ceramic Capacitors Current Mode Operation for Excellent Line and Load Transient Response Short-Circuit Protected Low Dropout Operation: 100% Duty Cycle Low Shutdown Current: IQ ≤ 1μA Low Quiescent Current: 60µA Output Voltages from 0.8V to 5V Selectable Burst Mode® Operation Sychronizable to External Clock