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

Multiple Supply Hot Swap Controller with I2C Compatible Monitoring Features: Allows Safe Insertion into Live CompactPCI™ or PCI Express™ Backplane 8-Bit ADC Monitors Current and Voltage I2C™/SMBus Interface dI/dt Controlled Soft Start Simultaneous or Sequenced Turn-On ±20V Absolute Maximum Rating for ±12V Supplies No External Gate Capacitor Required Dual-Level Circuit Breaker and Current Limit Bus Precharge Output Power Good Input with Timeout Optional Latch-off or Autoretry After Faults Alerts Host After Faults Integrated LOCAL_PCI_RST# Logic 36-Pin SSOP and 38-Pin (5mm × 7mm) QFN Packages

High Performance, Multiphase Energy, and Power Quality Measurement IC Features: 7 high performance ADCs 101 dB SNR Wide input voltage range: ±1 V, 707 mV rms FS at gain = 1 Differential inputs ±25 ppm/°C maximum channel drift (including ADC, internal VREF, PGA drift) enabling 10000:1 dynamic input range Class 0.2 metrology with standard external components Power quality measurements Enables implementation of IEC 61000-4-30 Class S VRMS ½, IRMS ½ rms voltage refreshed each half cycle 10 cycle rms/12 cycle rms Dip and swell monitors Line frequency—one per phase Zero crossing, zero-crossing timeout Phase angle measurements Supports CTs and Rogowski coil (di/dt) sensors Multiple range phase/gain compensation for CTs Digital integrator for Rogowski coils Flexible waveform buffer Able to resample waveform to ensure 128 points per line cycle for ease of external harmonic analysis Events, such as dip and swell, can trigger waveform storage Simplifies data collection for IEC 61000-4-7 harmonic analysis Advanced metrology feature set Total and fundamental active power, volt amperes reactive (VAR), volt amperes (VA), watthour, VAR hour, and VA hour Total and fundamental IRMS, VRMS Total harmonic distortion Power factor Supports active energy standards: IEC 62053-21 and IEC 62053-22; EN50470-3; OIML R46; and ANSI C12.20 Supports reactive energy standards: IEC 62053-23, IEC 62053-24 High speed communication port: 20 MHz serial port interface (SPI) Integrated temperature sensor with 12-bit successive approximation register (SAR) ADC ±3°C accuracy from −40°C to +85°C

Ultrathin 1.5A Module Thermoelectric Cooler (TEC) Regulator Features:Built-in Two Zero-Drift, Rail-to-Rail Chopper Amplifiers2.7V to 5.5V Input Voltage Range1.5A Driving Capability1% Accuracy 2.5V Internal Reference OutputIndependent Programmable Heating and Cooling Current LimitTEC Voltage and Current MonitoringProgrammable Maximum TEC VoltageDefault 2MHz Switching FrequencySynchronization from 1.85MHz to 3.25MHzCapable of NTC, PTC and RTD Thermal Sensors3.5mm 4mm 1.3mm LGA Package

High Voltage High Current Hot Swap Controller Features: Allows Safe Board Insertion into Live Backplane Wide Operating Voltage Range: 6.5V to 80V Drives Two Gates for High Power Applications Configurable Parallel, Staged Start or Single MOSFET Modes Adjustable Precision Current Limit: 6mV to 20mV Current Foldback Limits MOSFET Power SOA Timer Optimizes MOSFET Capability Monitors VGS and VDS for MOSFET Health 12V Gate Drive for Lower MOSFET RDS(ON) Parallelable Controllers for Very High Current Levels Available in 24-Lead Narrow SSOP and 24-Pin 4mm × 5mm QFN Packages

40V Low IQ, 3MHz Dual, 2-Phase Synchronous Step-Down Controller with Spread Spectrum Features: Wide Input Voltage Range: 4.5V to 40V Wide Output Voltage Range: 0.8V to 99% • VIN Low Operating IQ: 14μA (14V to 3.3V, Channel 1 On) Spread Spectrum Operation RSENSE or DCR Current Sensing Out-of-Phase Controllers Reduce Required Input Capacitance and Power Supply Induced Noise Programmable Fixed Frequency (100kHz to 3MHz) Phase-Lockable Frequency (100kHz to 3MHz) Selectable Continuous, Pulse-Skipping, or Low Ripple, Burst Mode® Operation at Light Loads Very Low Dropout Operation: 99% Duty Cycle Power Good Output Voltage Monitors Output Overvoltage Protection Internal LDO Powers Gate Drive from VIN or EXTVCC Low Shutdown IQ: 1.5μA Small 28-Lead 4mm × 5mm QFN Package AEC-Q100 Qualified for Automotive Applications

Ultrathin Low VIN, 2A Buck-Boost Module Regulator Features: Wide Input Voltage Range: 2.6V to 5.5V Adjustable Output Voltage Range: 1.8V to 5.5V 2A of Continuous Output Current with VIN ≥ VOUT (Buck Mode and Buck-Boost Mode); Minimum 1A Continuous Output Current with VIN < VOUT (Boost Mode). Low Ripple Buck-Boost Architecture Programmable Soft-Start and VIN UVLO Burst Mode IQ 15μA for High Efficiency at Light Loads Ultrathin, Small Surface Mount Footprint 3.5mm × 4mm × 1.25mm LGA Package

42V, 5A/7A Peak Synchronous Step-Down Silent Switcher with 2.5A Quiescent Current Features: Silent Switcher® Architecture Ultralow EMI Emissions Optional Spread Spectrum Modulation High Efficiency at High Frequency Up to 96% Efficiency at 1MHz, 12VIN to 5VOUT Up to 95% Efficiency at 2MHz, 12VIN to 5VOUT Wide Input Voltage Range: 3.4V to 42V 5A Maximum Continuous, 7A Peak Transient Output Ultralow Quiescent Current Burst Mode® Operation 2.5µA IQ Regulating 12VIN to 3.3VOUT Output Ripple < 10mVP-P Fast Minimum Switch On-Time: 30ns Low Dropout Under All Conditions: 100mV at 1A Forced Continuous Mode Adjustable and Synchronizable: 200kHz to 3MHz Output Soft-Start and Power Good Small 20-Lead 4mm × 3mm LQFN Package AEC-Q100 Qualified for Automotive Applications

36V 10W No-Opto Isolated Flyback Converter Features: 4V to 36V Input Voltage Range 3.6A, 65V Internal DMOS Power Switch Low Quiescent Current Quasi-Resonant Boundary Mode Operation at Heavy Load Low Ripple Burst Mode® Operation at Light Load Minimum Load < 0.5% (Typ) of Full Output No Transformer Third Winding or Opto-Isolator Required for Output Voltage Regulation Accurate EN/UVLO Threshold and Hysteresis Temperature Compensation for Output Diode Output Short-Circuit Protection Thermally Enhanced 8-Lead SO Package

Micropower, Regulated Charge Pump DC/DC Converters Features: 5V Output Current: 100mA (VIN ≥ 3V) 3.3V Output Current: 80mA (VIN ≥ 2.5V) Ultralow Power: 20µA Quiescent Current Regulated Output Voltage: 3.3V ±4%, 5V ±4%, ADJ VIN Range: 2V to 5.5V 800kHz Switching Frequency No Inductors Very Low Shutdown Current: <2µA Shutdown Disconnects Load from VIN PowerGood/Undervoltage Output Adjustable Soft-Start Time Short-Circuit/Thermal Protection Available in 8-Pin MSOP