Analog Devices Inc./Maxim Integrated MAX38912ATA+T

Overview

MAX38912ATA+T from Analog Devices is an adjustable-output, low-noise 500mA PMOS LDO linear regulator in a 2mm × 2mm 8-pin TDFN package. It delivers 11µVRMS output noise (10Hz–100kHz), 70dB PSRR at 10kHz, ±1% DC accuracy over line/load/temperature, and supports 0.8V–5.0V output via external feedback resistors. It powers high-precision analog blocks in battery-constrained portable systems.

For engineers reviewing the MAX38912ATA+T datasheet, MAX38912ATA+T pinout, MAX38912ATA+T application, or MAX38912ATA+T equivalent, key selection criteria include its dual-mode operation (19.2µA low-power mode / 332µA normal mode), active discharge (800Ω), Power-OK output, and stability with only 2µF effective output capacitance.

Technical Context

The MAX38912ATA+T implements a PMOS pass transistor architecture with programmable MODE pin control for seamless transition between 20mA/19.2µA low-power mode and 500mA/332µA high-power mode. Its internal 0.6V reference feeds a precision error amplifier that regulates output via external resistor divider on FB/OUTS.

It integrates multiple protection functions: thermal shutdown (165°C trip), reverse-current blocking, overcurrent limiting (700mA typ), undervoltage lockout (1.6V typ), and active discharge (800Ω). The open-drain POK pin asserts low when VOUT falls below 88–94% of target, enabling power sequencing in multi-rail systems.

Key Specifications

Pinout & Package

MAX38912ATA+T is housed in an 8-pin, 2mm × 2mm TDFN package with exposed pad (EP) connected to GND internally. The package supports high thermal efficiency (θJA = 85.3°C/W on 4-layer board) and compact layout in space-constrained handheld devices.

Key Features

Applications

Equivalent & Alternatives

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

Compared with XC6216D182MR-G and RP111N331B-TR-F, the MAX38912ATA+T uniquely combines ultra-low noise, hardware-configurable power modes, integrated POK, and active discharge-making it optimal for compact, battery-sensitive systems demanding both precision and intelligent power management.

Availability

MAX38912ATA+T is available at Aetrix Electronics and suitable for mobile phones, digital camera modules, IoT edge sensors, portable medical devices, and high-performance imaging systems requiring stable component supply, long-term lifecycle support, and traceable sourcing.

Supply support for MAX38912ATA+T 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

Analog Devices is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, serving industrial, automotive, communications, and healthcare markets.

The MAX38911/MAX38912 family was designed specifically for ultra-low-noise, dual-mode power delivery in space- and battery-constrained portable electronics-addressing the growing demand for clean, intelligent, and sequenced power in modern sensor and connectivity subsystems.

FAQ

What output voltage range does the MAX38912ATA+T support, and how is it set?

The MAX38912ATA+T supports an adjustable output voltage range of 0.8V to 5.0V, set using two external resistors connected to the FB/OUTS pin. The formula is VOUT = 0.6V × (1 + R_TOP/R_BOT). This configuration allows precise tailoring of the output for diverse loads without changing the MAX38912ATA+T itself-ideal for multi-voltage designs and BOM consolidation.

How does the MODE pin affect the MAX38912ATA+T's performance and power consumption?

The MODE pin selects between two operating states: high (normal mode) enables 500mA output with 332µA quiescent current, while low (low-power mode) limits output to 20mA and reduces quiescent current to 19.2µA. The MAX38912ATA+T transitions automatically after soft-start completion, with 50µs settling time required before applying full load in high-power mode. This dual-mode capability makes the MAX38912ATA+T ideal for duty-cycled applications like sensor polling or burst-mode wireless transmission.

Does the MAX38912ATA+T include built-in protection features, and which ones are implemented?

Yes, the MAX38912ATA+T integrates comprehensive protection: thermal shutdown (165°C trip), output overcurrent limiting (700mA typical), reverse-current blocking, undervoltage lockout (1.6V threshold), and active discharge (800Ω resistor from OUT to GND when EN is low). These features eliminate the need for external protection components, reduce design complexity, and enhance reliability in unattended or harsh-environment deployments-key advantages of the MAX38912ATA+T over basic LDOs.

What is the purpose of the BYP pin on the MAX38912ATA+T, and what capacitor value should be used?

The BYP pin on the MAX38912ATA+T connects to a capacitor between BYP and OUT to filter reference noise and control soft-start slew rate. A 10nF capacitor yields ~5V/ms slew rate and optimal noise reduction (11µVRMS). Capacitor values from 0.001µF to 0.1µF are supported; larger values slow startup to limit inrush current but offer minimal additional noise benefit. Using >10nF is recommended only when inrush current must be constrained-critical for the MAX38912ATA+T in systems with limited input capacitance or weak sources.

Can the MAX38912ATA+T be used with small output capacitors, and what is the minimum requirement?

Yes, the MAX38912ATA+T is stable with a minimum effective output capacitance of 2µF (low-ESR ceramic). A typical 4.7µF X5R/X7R capacitor meets this requirement and provides robust transient response. This low minimum capacitance enables compact designs using 0402- or 0603-size MLCCs-especially valuable in the MAX38912ATA+T's 2mm × 2mm TDFN footprint where board area is at a premium. Larger capacitors improve load transient suppression but are not required for stability.