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

Dual 2-Phase, No RSENSE,Synchronous Controller for DDR/QDR Memory Termination Features: No Current Sense Resistors Required Out-of-Phase Controllers Reduce Required Input Capacitance VOUT2 Tracks 1/2 VREF Symmetrical Source/Sink Output Current Capability (VOUT2) Spread Spectrum Operation (When Enabled) Wide VIN Range: 2.75V to 9.8V Constant Frequency Current Mode Operation 0.6V ±1.5% Voltage Reference (VOUT1) Low Dropout Operation: 100% Duty Cycle True PLL for Frequency Locking or Adjustment 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

Demonstration circuit 1586A is a high efficiency, dual-output (3.3V and 2.5V), synchronous buck converter with 4.5V to 25V input range. It can supply 5A maximum load current at 3.3V and 2.5V outputs. The demo board uses the LTC3855EUJ controller. The LTC3855 is a feature-rich dual-output dual-phase synchronous buck controller with on-chip drivers, remote output voltage sensing (VOUT2) and inductor DCR temperature compensation.

Supervisory Circuits Tiple Processor

Ultra-Low-Noise, High-Accuracy 4.096V Voltage Reference Features: Maximum temperature coefficient (TCVOUT): 0.8 ppm/°C (D grade 0°C to 70°C) 1 ppm/°C (C grade 0°C to 70°C) 2 ppm/°C (B grade −40°C to +125°C) 4 ppm/°C (A grade 40°C to +125°C) Output noise (0.1 Hz to 10 Hz): 1 μV p-p at VOUT of 2.048 V typical Initial output voltage error: B, C, D grade: ±0.02% (maximum) Input voltage range: 3 V to 15 V Operating temperature: A grade and B grade: −40°C to +125°C C grade: 0°C to +70°C Output current: +10 mA source/−10 mA sink Low quiescent current: 950 μA (maximum) Low dropout voltage: 300 mV at 2 mA (VOUT ≥ 3 V) 8-lead SOIC package and LCC package AEC-Q100 qualified for automotive applications Long-term drift: 8 ppm typical at 4500 hours

20 V, 300 mA, Low Noise, CMOS LDO Features:Input voltage range: 3.3 V to 20 VMaximum output current: 300 mALow noise: 15 V rms for fixed output versionsPSRR performance of 60 dB at 10 kHz, VOUT = 3.3 VReverse current protectionLow dropout voltage: 200 mV at 300 mA loadInitial accuracy: 0.8%See data sheet for additional features

Synchronous Current-Mode Buck Controller with Constant On-time, 0.6 V Reference Voltage, and Power Saving Mode Features: Power input voltage as low as 2.75 V to 20 V Bias supply voltage range: 2.75 V to 5.5 V Minimum output voltage: 0.6 V 0.6 V reference voltage with ±1.0% accuracy Supports all N-channel MOSFET power stages Available in 300 kHz, 600 KHz, and 1.0 MHz options No current-sense resistor required Power saving mode (PSM) for light loads (ADP1873 only) Resistor Programmable Current Sense Gain Thermal overload protection Short-circuit protection See data sheet for additional features

ADM823 - Supervisory Circuit with Watchdog and Manual RESET

ADM1232 - Microprocessor Supervisory Circuit