3A, 4MHz, Monolithic Synchronous Step-Down Regulator Features: High Efficiency: Up to 95% 3A Output Current Low Quiescent Current: 64μA Low RDS(ON) Internal Switch: 77mΩ 2.25V to 5.5V Input Voltage Range Programmable Frequency: 300kHz to 4MHz ±2% Output Voltage Accuracy 0.8V Reference Allows Low Output Voltage Selectable Forced Continuous/Burst Mode® Operation with Adjustable Burst Clamp Synchronizable Switching Frequency Low Dropout Operation: 100% Duty Cycle Power Good Output Voltage Monitor Overtemperature Protected Available in 16-Lead Exposed Pad TSSOP and QFN Packages

Dual 550kHz Synchronous 2-Phase DC/DC Controller with Programmable Up/Down Tracking Features: Wide VIN Range: 3V to 30V Operation with Line Feedforward Compensation Leading Edge Modulation Architecture for Extremely Low Duty Cycle Operation Phase-Lockable Fixed Frequency: 330kHz to 750kHz Two 180° Out-of-Phase Controllers Fast Programmable Power-Up/-Down Tracking Programmable Current Limit Without External Current Sense Resistor Optional Burst Mode® Operation at Light Load ±1% 0.6V Voltage Reference External N-Channel MOSFET Architecture Low Shutdown Current: <100µA Overvoltage Protection and PGOOD Flag Small 28-Lead SSOP and 32-Lead QFN Packages

Fast 2-Phase, No RSENSE, Synchronous DC/DC Controller with Tracking/Sequencing Features: PolyPhase® Valley Current Mode Controller Synchronizable to an External Clock with PLL Coincident or Ratiometric Tracking Sense Resistor Optional 2% to 90% Duty Cycle at 200kHz tON(MIN) < 100ns True Remote Sensing Differential Amplifier High Efficiency at Both Light and Heavy Loads Power Good Output Voltage Monitor 0.6V ±1% Reference Adjustable Current Limit Programmable Soft-Start and Operating Frequency Output Overvoltage Protection Optional Short-Circuit Shutdown Timer 32-Lead (5mm × 5mm) QFN Package

Single Switch Synchronous Forward Controller Features: Synchronous Rectifier Control for High Efficiency Programmable Volt-Second Clamp Output Power Levels from 25W to 500W Low Current Start-Up (LT1952: 460µA; VIN On/Off = 14.25V/8.75V) (LT1952-1: 400µA; VIN On/Off = 7.75V/6.5V) True PWM Soft-Start Low Stress Short Circuit Protection Precision 107mV Current Limit Threshold Adjustable Delay for Synchronous Timing Accurate Shutdown Threshold with Programmable Hysteresis Programmable Slope Compensation Programmable Leading Edge Blanking Programmable Frequency (100kHz to 500kHz) Synchronizable to an External Clock up to 1.5 • fOSC Internal 1.23V Reference 2.5V External Reference Current Mode Control Small 16-Pin SSOP Package

Isolated No-Opto Synchronous Flyback Controller with Wide Input Supply Range Features: Senses Output Voltage Directly from Primary Side Winding—No Opto-Isolator Required Synchronous Driver for High Efficiency Input Voltage Limited Only by External Power Components Accurate Output Regulation without User Trims Switching Frequency from 50kHz to 250kHz Synchronizable Load Compensation Programmable Undervoltage Lockout Available in a Thermally Enhanced 16-Lead TSSOP Package

Triple Output Synchronous 3-Phase DC/DC Controller with Up/Down Tracking Features: Current Mode Controller with On-board MOSFET Drivers Programmable Power Up/Down Tracking Wide VIN Range: 3.3V to 36V (VCC = 5V) ±1% 0.6V VFB Accuracy Over Temperature Power Good Output Voltage Monitor Phase-Lockable or Adjustable Frequency: 160kHz to 700kHz OPTI-LOOP® Compensation Minimizes COUT Current Foldback and Overvoltage Protection Selectable Continuous, Discontinuous or Burst Mode® Operation at Light Load Programmable Phase Operation Available in 5mm × 7mm QFN and 36-Lead SSOP Packages

Triple Output Synchronous 3-Phase DC/DC Controller with Up/Down Tracking Features: Current Mode Controller with On-board MOSFET Drivers Programmable Power Up/Down Tracking Wide VIN Range: 3.3V to 36V (VCC = 5V) ±1% 0.6V VFB Accuracy Over Temperature Power Good Output Voltage Monitor Phase-Lockable or Adjustable Frequency: 160kHz to 700kHz OPTI-LOOP® Compensation Minimizes COUT Current Foldback and Overvoltage Protection Selectable Continuous, Discontinuous or Burst Mode® Operation at Light Load Programmable Phase Operation Available in 5mm × 7mm QFN and 36-Lead SSOP Packages

USB Power Manager with High Voltage Switching Charger Features: Seamless Transition Between Power Sources: Li-Ion Battery, USB, and 6V to 36V External Supply High Efciency 1.2A Charger from 6V to 36V Input with Adaptive Output Control (LTC4089) Load Dependent Charging from USB Input Guarantees Current Compliance 215mΩ Internal Ideal Diode plus Optional External Ideal Diode Controller Provides Low Loss Power Path When External Supply/USB Not Present Constant-Current/Constant-Voltage Operation with Thermal Feedback to Maximize Charging Rate without Risk of Overheating Selectable 100% or 20% Current Limit (e.g., 500mA/100mA) from USB Input Preset 4.2V Charge Voltage with 0.8% Accuracy C/10 Charge Current Detection Output NTC Thermistor Input for Temperature Qualied Charging Tiny (6mm × 3mm × 0.75mm) 22-Pin DFN Package

Wide Input Voltage Synchronous Buck-Boost DC/DC Converter Features: Regulated Output with Input Voltages Above, Below or Equal to the Output 1.8V to 5.5V Input and 1.8V to 5.25V Output Range 250mA Continuous Output Current from 1.8V VIN 600mA Continuous/1A Peak Output Current from Li-Ion Single Inductor Synchronous Rectication: Up to 96% Efciency Programmable Automatic Burst Mode® Operation Output Disconnect in Shutdown Pin Compatible with the LTC3440 Programmable Frequency from 300kHz to 2MHz <1µA Shutdown Current Small Thermally Enhanced 10-Lead (3mm × 3mm) DFN and 10-Lead MS Packages

Single Switch Synchronous Forward Controller Features: Synchronous Rectifier Control for High Efficiency Programmable Volt-Second Clamp Output Power Levels from 25W to 500W Low Current Start-Up (LT1952: 460µA; VIN On/Off = 14.25V/8.75V) (LT1952-1: 400µA; VIN On/Off = 7.75V/6.5V) True PWM Soft-Start Low Stress Short Circuit Protection Precision 107mV Current Limit Threshold Adjustable Delay for Synchronous Timing Accurate Shutdown Threshold with Programmable Hysteresis Programmable Slope Compensation Programmable Leading Edge Blanking Programmable Frequency (100kHz to 500kHz) Synchronizable to an External Clock up to 1.5 • fOSC Internal 1.23V Reference 2.5V External Reference Current Mode Control Small 16-Pin SSOP Package