Analog Devices Inc./Maxim Integrated MAX8902BATA+

Overview

MAX8902BATA+ from Maxim Integrated is an adjustable-output, low-noise 500mA LDO regulator in a 2mm × 2mm TDFN-EP package. It delivers ±1.5% output accuracy over load, line, and temperature; maintains only 16µVRMS output noise (10Hz–100kHz); achieves 92dB PSRR at 5kHz; and operates with as little as 100mV dropout at full 500mA load - ideal for powering noise-sensitive analog rails in portable media players and GPS navigation devices.

For engineers reviewing the MAX8902BATA+ datasheet, MAX8902BATA+ pinout, MAX8902BATA+ application, or MAX8902BATA+ equivalent, key selection criteria include its 0.6V–5.3V adjustable output range via external FB divider, POK (power-OK) open-drain output, thermal-overload and reverse-current protection, and guaranteed operation across –40°C to +125°C automotive temperature range.

Technical Context

The MAX8902BATA+ uses a pMOS pass transistor architecture enabling ultra-low dropout and inherent reverse-current blocking without external components. Its feedback loop references a precision 0.600V internal bandgap (±0.009V tolerance), and regulation stability is maintained with a minimum 10µF ceramic output capacitor and 0.01µF BYP-to-OUT capacitor.

Control logic includes programmable soft-start (via BYP capacitor value), enable input with 0.4V–1.2V threshold, and thermal shutdown that cycles between 150°C (restart) and 165°C (shutdown). The POK output asserts low when VOUT reaches ≥91% of nominal regulation voltage and enters high-impedance state during shutdown or undervoltage.

Key Specifications

Pinout & Package

MAX8902BATA+ is housed in an 8-pin, 2mm × 2mm × 0.8mm TDFN-EP package with exposed paddle (EP) for thermal dissipation. The EP must be soldered to a PCB ground plane with thermal vias for reliable operation at full load across the automotive temperature range.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar LDO regulator applications.

Compared with MAX8902BATA+, both alternatives lack the combination of adjustable output, integrated POK, automotive temperature support, and sub-20µVRMS noise - making MAX8902BATA+ uniquely suited for compact, noise-critical, and thermally demanding portable and automotive power rails.

Availability

MAX8902BATA+ is available at Aetrix Electronics and suitable for portable media players, GPS navigation devices, smartphone camera modules, and automotive infotainment systems requiring stable component supply with full automotive temperature qualification and RoHS compliance.

Supply support for MAX8902BATA+ includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.

Manufacturer

Maxim Integrated (now part of Analog Devices) designs high-performance analog and mixed-signal ICs for power management, sensing, and connectivity applications.

The MAX8902 family targets portable and automotive systems needing ultra-low-noise, high-accuracy LDOs with integrated protection and power sequencing features - specifically optimized for noise-sensitive analog and RF subsystems.

FAQ

What is the minimum input voltage required for MAX8902BATA+ to regulate a 1.2V output?

The MAX8902BATA+ requires a minimum input voltage of 1.3V to maintain regulation at 1.2V output, based on its maximum 100mV dropout specification at full load. At lighter loads, dropout decreases further - e.g., 50mV at 100mA - allowing operation down to 1.25V input. This behavior is confirmed in the Electrical Characteristics table under "Dropout Voltage" with IOUT = 500mA and VIN ≥ VOUT + 0.1V.

How does the POK output function on the MAX8902BATA+?

The POK (Power-OK) output on MAX8902BATA+ is an open-drain signal that pulls low when the regulated output voltage reaches ≥91% of its nominal value, indicating valid regulation. During startup, POK remains high-impedance until this threshold is crossed; it returns to high-impedance if VOUT drops below 88% due to overload or shutdown. This enables safe power sequencing in multi-rail systems - a feature absent in the MAX8902A variant.

Can MAX8902BATA+ be used with ceramic output capacitors smaller than 10µF?

No - the MAX8902BATA+ requires a minimum 10µF ceramic output capacitor (X5R/X7R dielectric) for guaranteed stability across temperature and load, as specified in the "Output Capacitor" section of the datasheet. Using less capacitance risks oscillation or poor transient response, especially under 500mA load steps. The 10µF value is validated for all operating conditions including –40°C to +125°C.

What is the purpose of the BYP pin on MAX8902BATA+ and how does it affect noise performance?

The BYP pin on MAX8902BATA+ connects to a 0.01µF capacitor tied to OUT, forming a low-frequency filter that reduces reference and amplifier noise - directly enabling the specified 16µVRMS output noise (10Hz–100kHz). This capacitor also controls startup slew rate: 0.01µF yields 5V/ms, while larger values reduce inrush current. Leakage >10nA on BYP degrades output accuracy and must be avoided.

Does MAX8902BATA+ provide reverse-current protection, and how is it implemented?

Yes - MAX8902BATA+ includes active reverse-current protection that disables the pass device when IN falls 10mV below OUT, preventing backflow from output capacitors into the input supply during power-down transients. This is implemented via an internal reverse-voltage detector and eliminates the need for an external blocking diode or MOSFET - preserving efficiency and board space in battery-powered systems.