High Efficiency, High Voltage 100mA Synchronous Step-Down Converter Features: Wide Input Voltage Range: Operation from 4.5V to 45V Overvoltage Lockout Provides Protection Up to 60V Internal High Side and Low Side Power Switches No Compensation Required 100mA Output Current Low Dropout Operation: 100% Duty Cycle Low Quiescent Current: 12μA 0.8V ±1% Feedback Voltage Reference Adjustable Peak Current Limit Internal and External Soft-Start Precise RUN Pin Threshold with Adjustable Hysteresis 3.3V, 5V and Adjustable Output Versions Only Three External Components Required for Fixed Output Versions Low Profile (0.75mm) 3mm × 3mm DFN and Thermally-Enhanced MS8E Packages

15V Dual 3A Monolithic Step-Down Regulator for DDR Power Features: 3.6V to 15V Input Voltage Range ±3A Output Current per Channel Up to 95% Efficiency Selectable 90°/180° Phase Shift Between Channels Adjustable Switching Frequency: 500kHz to 4MHz VTTR = VDDQ/2 = VTT Reference ±1.6% Accurate VTTR at 0.75V Optimal VOUT Range: 0.6V to 3V ±10mA Buffered Output Supplies VREF Reference Voltage Current Mode Operation for Excellent Line and Load Transient Response External Clock Synchronization Short-Circuit Protected Input Overvoltage and Overtemperature Protection Power Good Status Outputs Available in (4mm × 5mm) QFN-28 and Thermally Enhanced 28-Lead TSSOP Packages

High Efficiency, 140V 250mA Step-Down Regulator Features: Wide Operating Input Voltage Range: 4V to 140V Internal Low Resistance Power MOSFET No Compensation Required Adjustable 20mA to 250mA Maximum Output Current Low Dropout Operation: 100% Duty Cycle Low Quiescent Current: 12μA Wide Output Range: 0.8V to VIN 0.8V ±1% Feedback Voltage Reference Precise RUN Pin Threshold Internal or External Soft-Start Programmable 1.8V, 3.3V, 5V or Adjustable Output Few External Components Required Programmable Input Overvoltage Lockout Thermally Enhanced High Voltage MSOP Package

Wide Input Range, No RSENSE Positive-to-Negative DC/DC Controller Features: High Efficiency Operation (No Sense Resistor Required) Wide Input Voltage Range: 2.5V to 36V Current Mode Control Provides Excellent Transient Response High Maximum Duty Cycle (Typ 92%) ±1% Internal Voltage Reference ±2% RUN Pin Threshold with 100mV Hysteresis Micropower Shutdown: IQ = 10µA Programmable Switching Frequency (50kHz to 1MHz) with One External Resistor Synchronizable to an External Clock Up to 1.3 × fOSC User-Controlled Pulse Skip or Burst Mode® Operation Internal 5.2V Low Dropout Voltage Regulator Capable of Operating with a Sense Resistor for High Output Voltage Applications (VDS >36V) Small 10-Lead MSOP Package

Wide Input Range, No RSENSE Positive-to-Negative DC/DC Controller Features: High Efficiency Operation (No Sense Resistor Required) Wide Input Voltage Range: 2.5V to 36V Current Mode Control Provides Excellent Transient Response High Maximum Duty Cycle (Typ 92%) ±1% Internal Voltage Reference ±2% RUN Pin Threshold with 100mV Hysteresis Micropower Shutdown: IQ = 10µA Programmable Switching Frequency (50kHz to 1MHz) with One External Resistor Synchronizable to an External Clock Up to 1.3 × fOSC User-Controlled Pulse Skip or Burst Mode® Operation Internal 5.2V Low Dropout Voltage Regulator Capable of Operating with a Sense Resistor for High Output Voltage Applications (VDS >36V) Small 10-Lead MSOP Package

Low Input Voltage, DC/DC Controller for DDR/QDR Memory Termination Features: Very Low VIN(MIN): 1.5V Ultrafast Transient Response True Current Mode Control 5V Drive for N-Channel MOSFETs Eliminates Auxillary 5V Supply No Sense Resistor Required Uses Standard 5V Logic-Level N-Channel MOSFETs VOUT(MIN): 0.4V VOUT Tracks 1/2 VIN or External VREF Symmetrical Source and Sink Output Current Limit Adjustable Switching Frequency tON(MIN) <100ns Power Good Output Voltage Monitor Programmable Soft-Start Output Overvoltage Protection Optional Short-Circuit Shutdown Timer Small 24-Lead SSOP Package

Push-Pull PWM Controller Features: High Efficiency Push-Pull PWM 1.5A Sink, 1A Source Output Drivers Adjustable Push-Pull Dead-Time Adjustable System Undervoltage Lockout and Hysteresis Adjustable Leading Edge Blanking Low Start-Up and Quiescent Currents Current Mode Operation Single Resistor Slope Compensation VCC UVLO and 25mA Shunt Regulator Programmable Fixed Frequency Operation to 1MHz Soft-Start, Cycle-by-Cycle Current Limiting and Hiccup Mode Short-Circuit Protection 5V, 15mA Low Dropout Regulator 16-Pin SSOP and (4mm x 4mm) QFN Packages

High Efficiency, 2-Phase Synchronous Step-Down Switching Regulators Features: Wide Output Voltage Range: 0.8V ≤ VOUT ≤ 14V Out-of-Phase Controllers Reduce Required Input Capacitance and Power Supply Induced Noise OPTI-LOOP® Compensation Minimizes COUT ±1% Output Voltage Accuracy Power Good Output Voltage Monitor Phase-Lockable Fixed Frequency 250kHz to 550kHz Latched Short-Circuit Shutdown (LTC3727 Only) Dual N-Channel MOSFET Synchronous Drive Wide VIN Range: 4V to 36V Operation Very Low Dropout Operation: 99% Duty Cycle Adjustable Soft-Start Current Ramping Foldback Output Current Limiting Output Overvoltage Protection Low Shutdown IQ: 20µA Selectable Constant Frequency or Burst Mode® Operation Small 28-Lead SSOP Package LTC3727-1 Also Available in the 5mm × 5mm QFN Package

Dual, 550kHz, 2-Phase Synchronous Regulator Features: Dual, 180° Phased Controllers Reduce Required Input Capacitance and Power Supply Induced Noise OPTI-LOOP® Compensation Minimizes COUT ±1.5% Output Voltage Accuracy Power Good Output Voltage Indicator Phase-Lockable Fixed Frequency 250kHz to 550kHz Over Current Latch-off Disabled Wide VIN Range: 4.5V to 28V (35V for LTC3728LI-1) Operation Very Low Dropout Operation: 99% Duty Cycle Adjustable Soft-Start Current Ramping Foldback Output Current Limiting Output Overvoltage Protection Low Shutdown IQ: 20μA 5V and 3.3V Standby Regulators 3 Selectable Operating Modes: Constant Frequency, Burst Mode® Operation and PWM 5mm × 5mm QFN and 28-Lead Narrow SSOP Packages

Dual 2-Phase, No RSENSE, Synchronous Controller with Output Tracking Features: No Current Sense Resistors Required Out-of-Phase Controllers Reduce Required Input Capacitance Tracking Function Wide VIN Range: 2.75V to 9.8V 0.6V ±1% Voltage Reference High Current Limit Constant Frequency Current Mode Operation Low Dropout Operation: 100% Duty Cycle True PLL for Frequency Locking or Adjustment Selectable Pulse Skipping/Forced Continuous Operation Auxiliary Winding Regulation Internal Soft-Start Circuitry Power Good Output Voltage Monitor Output Overvoltage Protection Micropower Shutdown: IQ = 9μA Tiny Low Profile (4mm × 4mm) QFN and narrow SSOP packages.