Ultraprecision, Low Noise, 5.00 V XFET Voltage Reference Features: Low noise (0.1 Hz to 10 Hz)  ADR420: 1.75 μVp-p ADR421: 1.75 μVp-p ADR423: 2.0 μVp-p ADR425: 3.4 μVp-p Low temperature coefficient: 3 ppm/°C Long-term stability: 50 ppm/1000 hours Load regulation: 70 ppm/mA Line regulation: 35 ppm/V Low hysteresis: 40 ppm typical Wide operating range ADR420: 4 V to 18 V ADR421: 4.5 V to 18 V ADR423: 5 V to 18 V ADR425: 7 V to 18 V Quiescent current: 0.5 mA maximum High output current: 10 mA Wide temperature range: −40°C to +125°C

Ultralow Noise, High Accuracy Voltage References

Digital Controller for Isolated Power Supply Applications

Dual, 300 mA Fixed Output, Low Noise, High PSRR Voltage Regulator Features: Input voltage range: 2.5 V to 5.5 V Small, 8-lead, 2 mm x 2 mm LFCSP package Initial accuracy: ±1% High PSRR: 70 dB at 10 kHz, 60 dB at 100 kHz, 40 dB at 1 MHz Low noise: 27 μV rms at VOUT = 1.2 V, 50 μV rms at VOUT = 2.8 V Excellent transient response Low dropout voltage: 170 mV at 300 mA load 65 μA typical ground current at no load, both LDOs enabled Overcurrent and thermal protection

Ultralow Noise XFET 3.0V Voltage Reference w/Current Sink and Source Capability Features: Low noise (0.1 Hz to 10.0 Hz): 3.5 μV p-p @ 2.500 V output No external capacitor required Low temperature coefficient A Grade: 10 ppm/°C maximum B Grade: 3 ppm/°C maximum Load regulation: 15 ppm/mA Line regulation: 20 ppm/V Wide operating range ADR433: 5.0 V to 18 V High output source and sink current: 30 mA and −20 mA Wide temperature range: −40°C to +125°C

Compact, 600 mA, 3 MHz, Step-Down DC-to-DC Converter Features: Peak efficiency: 95% 3 MHz fixed frequency operation Typical quiescent current: 18 μA Maximum load current: 600 mA Input voltage: 2.3 V to 5.5 V Uses tiny multilayer inductors and capacitors Current mode architecture for fast load and line transient response 100% duty cycle low dropout mode Internal synchronous rectifier Internal soft start See data sheet for additional Information

Ultra Low Quiescent Current 150 mA, CMOS Linear Regulator Features: Ultralow quiescent current: IQ = 560 nA with 0 μA load IQ = 860 nA with 1 μA load Stable with 1 μF ceramic input and output capacitors Maximum output current: 150 mA Input voltage range: 2.2 V to 5.5 V Low shutdown current: < 50 nA typical Low dropout voltage: 195 mV @ 150 mA load Initial accuracy: ±1% Accuracy over line, load, and temperature: ±3.5% 15 fixed output voltage options: 1.2 V to 4.2 V Adjustable output available PSRR performance of 72 dB @ 100 Hz See data sheet for additional features Logic-control enable

Ultralow Quiescent Current, 150 mA, CMOS Linear Regulators Features: Ultralow quiescent current IQ = 560 nA with 0 μA load IQ = 860 nA with 1 μA load Stable with 1 μF ceramic input and output capacitors Maximum output current: 150 mA Input voltage range: 2.2 V to 5.5 V Low shutdown current: <50 nA typical Low dropout voltage: 195 mV @ 150 mA load Initial accuracy: ±1% Accuracy over line, load, and temperature: ±3.5% 15 fixed output voltage options: 1.2 V to 4.2 V Adjustable output available PSRR performance of 72 dB @ 100 Hz See data sheet for additional features

Hot-Swap Controller and Digital Power Monitor with PMBus Interface Features: Controls supply voltages from 2 V to 20 V 370 ns response time to short circuit Resistor-programmable 5 mV to 25 mV current limit ±1% accurate, 12-bit ADC for current, VIN/VOUT readback Charge-pumped gate drive for multiple external N-channel FETs High gate drive voltage to ensure lowest RDSON Foldback for tighter FET SOA protection Automatic retry or latch-off on current fault Programmable current limit timer for SOA Programmable, multifunction GPOs Power-good status output Analog UV and OV protection ENABLE pin (ADM1275-3 only) Peak detect registers for current and voltage PMBus fast mode compliant interface 16-lead QSOP and 20-lead QSOP and LFCSP

Quad Parametric Measurement Unit With Integrated 16-Bit Level Setting DACs Features: Quad parametric measurement unit (PMU)  FV, FI, FN (high-Z), MV, MI functions 4 Programmable Current Ranges (Internal RSENSE)  ±5uA, ±20uA, ±200uA and ±2mA 1 Programmable Current Range up to ±80mA (external RSENSE) 22.5 V FV Range with Asymmetrical Operation Integrated 16-Bit DACs Provide Programmable Levels Gain and offset correction on chip Low capacitance outputs suited to relay less systems On-chip comparators per channel See Data Sheet for Additional Information