Specifications
MAX38902AATA+ is an ultra-low-noise 500mA single-channel LDO linear regulator from Analog Devices (Maxim Integrated). The suffix AATA+ stands for 2×2mm 8-pin WFDFN exposed pad surface-mount packaging, optimized for precision analog, sensor, RF and industrial low-noise power supply circuitsAnalog Devices.
👉 It differs from resistor-adjustable MAX38902B/C variants with POK power-good signal. MAX38902A provides 9 pin-selectable fixed preset output voltages without external feedback resistors, delivering ultra-low output noise and high power supply rejection ratio (PSRR) for noise-sensitive analog frontends.
Key Features
- Ultra-Low Noise & Precision Regulation
- RMS output noise: Only 10.5µV (10Hz–100kHz bandwidth)
- Output voltage accuracy: ±1% across full input, load and temperature range
- PSRR performance: 70dB @ 1kHz, 40dB @ 1MHz to suppress switching power supply interference
- Dropout voltage: Typical 100mV at full 500mA load for high efficiency under low input headroom
- Nine pin-strapped fixed output options: 1.2V, 1.5V, 1.8V, 2.5V, 3.0V, 3.1V, 3.3V, 4.0V, 5V
- Electrical Operating Parameters
- Input voltage range: 1.7V to 5.5V, compatible with Li-ion battery and standard 5V system rails
- Max continuous output current: 500mA
- Typical no-load quiescent current Iq: 365µA, independent of dropout voltage
- Active shutdown mode (EN pin low): Iq drops below 1µA to conserve battery power
- Built-in 800Ω active discharge circuit to rapidly bleed output capacitor voltage during power-off
- Integrated Protection & Control Functions
- Programmable soft-start ramp to eliminate power-up inrush current
- Cycle-by-cycle overcurrent short-circuit protection
- Overtemperature thermal shutdown with automatic recovery
- Reverse current blocking to prevent output-to-input back-feeding damage
- Active-high enable pin for system power sequencing control
- Compact Package & Industrial Reliability
- Package: 8-pin WFDFN (TDFN-EP), 2mm × 2mm footprint with exposed thermal pad for heat dissipation
- Operating junction temperature range: -40°C ~ +125°C industrial wide grade
- MSL 1 moisture sensitivity level, unlimited floor life without dry bag storage
- Fully RoHS lead-free, halogen-free and SVHC compliant
- Tape-and-reel bulk packaging variant MAX38902AATA+T available for mass SMT production
Typical Applications
Precision MEMS sensor power rails (IMU, accelerometer, magnetometer, pressure sensors)
RF transceiver, Bluetooth/Wi-Fi radio low-noise analog supply
Medical portable diagnostic equipment analog front-end power
Industrial test & measurement instrument signal conditioning circuits
High-resolution ADC/DAC reference power supply
Handheld battery-powered IoT environmental data loggers
Smart wearable motion tracking hardware noise-free power
Automotive auxiliary sensor signal processing modules
Low-noise camera image sensor core voltage regulation
Portable barcode scanner and wireless access control electronics
LXB Semicon supplies original Analog Devices MAX38902AATA+ ultra-low-noise 500mA fixed-output LDO regulator IC
