The REF19x series precision band gap voltage references use a patented temperature drift curvature correction circuit and laser trimming of highly stable, thin-film resistors to achieve a very low temperature coefficient and high initial accuracy.The REF19x series is made up of micropower, low dropout voltage (LDV) devices, providing stable output voltage from supplies as low as 100 mV above the output voltage and consuming less than 45 μA of supply current. In sleep mode, which is enabled by applying a low TTL or CMOS level to the SLEEP pin, the output is turned off and supply current is further reduced to less than 15 μA.The REF19x series references are specified over the extended industrial temperature range (−40°C to +85°C) with typical performance specifications over −40°C to +125°C for applications, such as automotive.All electrical grades are available in an 8-lead SOIC package; the PDIP and TSSOP packages are available only in the lowest electrical grade.ApplicationsPortable instruments ADCs and DACs Smart sensors Solar powered applications Loop-current-powered instruments Data Sheet, Rev. J, 3/08

The LTC4222 Hot Swap™ controller allows two power paths to be safely inserted and removed from a live backplane. Using external N-channel pass transistors, board supply voltages and inrush currents are ramped up at an adjustable rate. An I2C interface and on-board ADC allows for monitoring of current, voltage and fault status for each channel. The device features adjustable, analog, foldback current limit circuits and a Soft-Start circuit that sets the dI/dt of the inrush currents. An I2C interface may configure the part to latch off or automatically restart after the LTC4222 detects a fault on either channel. The controller has additional features to interrupt the host when a fault has occurred, notify when output power is good, detect insertion of a load card and power-up either automatically upon insertion or wait for an I2C command to turn on.Applications Live Board Insertion Electronic Circuit Breakers Computers, Servers Platform Management

Adjustable 1.1A Single Resistor Low Dropout Regulator Features: Outputs May Be Paralleled for Higher Current and Heat Spreading Output Current: 1.1A Single Resistor Programs Output Voltage 1% Initial Accuracy of SET Pin Current Output Adjustable to 0V Low Output Noise: 40VRMS (10Hz to 100kHz) Wide Input Voltage Range: 1.2V to 36V Low Dropout Voltage: 350mV (Except SOT-223 Package) <1mV Load Regulation <0.001%/V Line Regulation Minimum Load Current: 0.5mA Stable with 2.2F Minimum Ceramic Output Capacitor Current Limit with Foldback and Overtemperature Protected Available in 8-Lead MSOP, 3mm 3mm DFN 5-Lead DD-Pak, TO-220 and 3-Lead SOT-223 AEC-Q100 Qualified for Automotive Applications

3A, 4MHz Monolithic Synchronous Step-Down DC/DC Converter Features: 3A Output Current 2.25V to 5.5V Input Voltage Range Low Output Ripple Burst Mode® Operation: IQ = 70μA ±1% Output Voltage Accuracy Output Voltage Down to 0.6V High Efficiency: Up to 95% Low Dropout Operation: 100% Duty Cycle Shutdown Current: ≤1μA Adjustable Switching Frequency: Up to 4MHz Programmable Soft-Start Optional Active Voltage Positioning (AVP) with Internal Compensation Selectable Pulse-Skipping/Forced Continuous/Burst Mode Operation with Adjustable Burst Clamp Inputs for Start-Up Tracking or External Reference DDR Memory Mode, IOUT = ±1.5A Available in Thermally Enhanced 20-Pin (3mm × 4mm) QFN and TSSOP Packages AEC-Q100 Qualified for Automotive Applications

Low Voltage Ideal Diode Controller with Monitoring Features: Low Loss Replacement for Power Diode Controls N-Channel MOSFET 0V to 18V Supply ORing or Holdup 0.5μs Turn-On and Turn-Off Time Undervoltage and Overvoltage Protection Open MOSFET Detect Status and Fault Outputs Hot Swappable Reverse Current Enable Input 12-Pin MSOP and DFN (3mm × 3mm) Packages

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

Dual Output PolyPhase Step-Down DC/DC Controller with Digital Power System Management Features: PMBus/I2C Compliant Serial Interface Telemetry Read Back includes VIN, IIN, VOUT, IOUT, Temperature and Faults Programmable Voltage, Current Limit, Digital Soft-Start/Stop, Sequencing, Margining, OV/UV and Frequency Synchronization (250kHz to 1MHz) ±0.5% Output Voltage Accuracy Over Temperature Integrated 16-Bit ADC Internal EEPROM with ECC and Fault Logging Integrated Powerful N-Channel MOSFET Gate Drivers Power Conversion Wide VIN Range: 4.5V to 24V VOUT Range: 0.5V to 5.4V (4V on VOUT0) Analog Current Mode Control Loop Accurate PolyPhase® Current Sharing for Up to 6 Phases Available in a 40-Pin (6mm × 6mm) QFN Package AEC-Q100 Qualified for Automotive Applications

12 Channel Multicell Battery Monitor with Daisy Chain Interface, Generation 2 Features: Measures Up to 12 Battery Cells in Series Stackable Architecture Supports Multiple Battery Chemistries and Supercapacitors Serial Interface Daisy Chains to Adjacent Devices 0.25% Maximum Total Measurement Error Engineered for ISO26262 Compliant Systems 13ms to Measure All Cells in a System Passive Cell Balancing: Integrated Cell Balancing MOSFETs Ability to Drive External Balancing MOSFETs On-board Temperature Sensor and Thermistor Inputs 1MHz Serial Interface with Packet Error Checking Safe with Random Connection of Cells Built-In Self Tests Delta-Sigma Converter With Built-In Noise Filter Open-Wire Connection Fault Detection 12μA Standby Mode Supply Current High EMI Immunity 44-Lead SSOP Package

1.4A, 500kHz Step-Down Switching Regulator Features: Wide Input Range: 3.6V to 36V Short-Circuit Protected Over Full Input Range 1.9A Guaranteed Minimum Switch Current 5V at 1.4A from 10V to 36V Input 3.3V at 1.4A from 7V to 36V Input 5V at 1.2A from 6.3V to 36V Input 3.3V at 1.2A from 4.5V to 36V Input Output Adjustable Down to 1.20V 500kHz Fixed Frequency Operation Soft-Start Uses Small Ceramic Capacitors Internal or External Compensation Low Shutdown Current: <2µA Thermally Enhanced 8-Lead MSOP Package

600mA Low VIN Buck Regulator in 3mm 3mm DFN Features: 1.6V to 5.5V Input Voltage Range Internal Soft-Start Selectable 1.7MHz or 2.6MHz Constant Frequency Operation Internal Oscillator can be Synchronizable to an External Clock, 1MHz to 3MHz Range High Efficiency: Up to 95% Very Low Quiescent Current: Only 65µA During Burst Mode® Operation 600mA Output Current (VIN = 1.8V, VOUT = 1.2V) 750mA Peak Inductor Current No Schottky Diode Required Low Dropout Operation: 100% Duty Cycle 0.613V Reference Voltage Stable with Ceramic Capacitors Shutdown Mode Draws <1µA Supply Current Current Mode Operation for Excellent Line and Load Transient Response Overtemperature Protection Available in a Low Profile (0.75mm) 8-Lead (3mm × 3mm) DFN Package