Analog Devices Inc./Maxim Integrated MAX8902AATA/V+T

Overview

MAX8902AATA/V+ from Maxim Integrated is a pin-selectable, low-noise 500mA LDO regulator in an automotive-qualified 2mm × 2mm TDFN package. It delivers 4.6V output with ±1.5% accuracy over load, line, and temperature; features 16µVRMS output noise (10Hz–100kHz), 92dB PSRR at 5kHz, and only 100mV max dropout at full load - ideal for powering noise-sensitive RF and audio circuitry in portable navigation devices.

For engineers reviewing the MAX8902AATA/V+ datasheet, MAX8902AATA/V+ pinout, MAX8902AATA/V+ application, or MAX8902AATA/V+ equivalent, key selection criteria include its automotive-grade -40°C to +125°C operation, SELA/SELB voltage selection logic, reverse-current protection, thermal shutdown behavior, and BYP capacitor-controlled startup slew rate.

Technical Context

The MAX8902AATA/V+ uses a pMOS pass device architecture enabling ultra-low dropout and inherent reverse-current blocking without external components. Its reference and error amplifier are decoupled via the BYP pin, allowing independent noise filtering and programmable startup timing.

Output voltage is set at power-on by sampling SELA and SELB states - fixed to 4.6V when SELA = IN and SELB = GND - and remains stable until EN or IN is cycled. The device integrates soft-start, short-circuit limiting (700mA typ), thermal shutdown (165°C trip), and input-to-output reverse-voltage detection (10mV threshold).

Key Specifications

Pinout & Package

MAX8902AATA/V+ is housed in an 8-pin, 2mm × 2mm × 0.8mm TDFN package with exposed paddle (EP) for thermal dissipation. The EP must be soldered to a PCB ground plane with thermal vias to maintain junction temperature within limits under 500mA load.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX8902BATA/V+, the MAX8902AATA/V+ eliminates external feedback components and POK routing but retains identical noise, PSRR, and thermal protection - simplifying design for fixed-voltage systems. Versus XC6210B462MR-G, it adds automotive qualification, reverse-current blocking, and superior noise/PSRR performance at higher cost.

Availability

MAX8902AATA/V+ is available at Aetrix Electronics and suitable for GPS navigation devices, wireless headphones, notebook EC subsystems, smartphone camera ISPs, and automotive infotainment modules requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for MAX8902AATA/V+ 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 precision analog, mixed-signal, and power-management ICs for demanding industrial, automotive, and communications applications.

The MAX8902 family targets noise-sensitive portable and automotive electronics, delivering ultra-low-noise, high-accuracy LDO regulation with integrated protection and automotive qualification in miniature packages.

FAQ

What output voltage does MAX8902AATA/V+ deliver, and how is it configured?

The MAX8902AATA/V+ delivers a fixed 4.6V output. This is configured by connecting SELA to IN and SELB to GND - states sampled at power-on. No external resistors or programming are required. The voltage remains stable across -40°C to +125°C with ±1.5% accuracy over load, line, and temperature, making MAX8902AATA/V+ ideal for precision analog rails where consistency is critical.

Does MAX8902AATA/V+ include reverse-current protection, and how does it work?

Yes, MAX8902AATA/V+ includes integrated output-to-input reverse-current protection. When the input voltage drops 10mV below the output voltage - such as during input power removal with large output capacitance - the internal pMOS pass device is actively shut off, preventing reverse current flow. This feature protects batteries and upstream supplies, and is confirmed in the Absolute Maximum Ratings and Detailed Description sections of the MAX8902AATA/V+ datasheet.

What is the role of the BYP pin on MAX8902AATA/V+, and what capacitor value is required for low-noise operation?

The BYP pin on MAX8902AATA/V+ serves two functions: it filters reference noise to achieve 16µVRMS output noise, and controls startup slew rate. A 0.01µF ceramic capacitor between BYP and OUT is required to meet the specified noise performance. This value also sets a 5V/ms output ramp rate during startup, limiting inrush current into the 10µF output capacitor - a key design detail for reliable MAX8902AATA/V+ integration.

How does MAX8902AATA/V+ handle thermal overload, and what is its shutdown threshold?

MAX8902AATA/V+ incorporates thermal-overload protection with a 165°C junction temperature shutdown threshold and 150°C hysteresis-based recovery point. When sustained overload causes junction temperature to reach 165°C, the output is disabled. Once the die cools to 150°C, regulation resumes - creating a safe thermal cycling mode that prevents permanent damage. This behavior is guaranteed across the full -40°C to +125°C operating range and applies to all MAX8902AATA/V+ units.

Is MAX8902AATA/V+ pin-compatible with other variants in the MAX8902 family, such as MAX8902BATA/V+?

No, MAX8902AATA/V+ is not pin-compatible with MAX8902BATA/V+. While both share the same 8-pin 2mm × 2mm TDFN package and pin 1–2–3–7–8 assignments (IN, GND, EN, BYP, OUT), pins 4–5–6 differ: MAX8902AATA/V+ uses SELA, SELB, and OUTS, whereas MAX8902BATA/V+ uses GS, POK, and FB. Swapping them without board redesign will cause functional failure - confirming MAX8902AATA/V+ as a distinct pinout variant optimized for fixed-voltage applications.