Analog Devices Inc./Maxim Integrated MAX25300BATA/V+

Overview

MAX25300BATA/V+ from Analog Devices is a low-noise, 500mA automotive-grade LDO linear regulator with resistor-adjustable output (0.6V–5.3V), 12µVRMS output noise (10Hz–100kHz), ±1% DC accuracy over load/line/temperature, and integrated active-high Power-OK (POK) output - designed for high-fidelity audio power rails and precision sensor biasing in AEC-Q100-compliant vehicle systems.

For engineers reviewing the MAX25300BATA/V+ datasheet, MAX25300BATA/V+ pinout, MAX25300BATA/V+ application, or MAX25300BATA/V+ equivalent, key selection criteria include its 100mV dropout at 500mA, 70dB PSRR at 10kHz, POK timing behavior, thermal shutdown threshold (+165°C), and compatibility with 2µF minimum ceramic output capacitance.

Technical Context

The MAX25300BATA/V+ implements a pMOS pass transistor architecture with internal 0.6V reference and external resistor feedback (FB pin), enabling precise output voltage setting across 0.6V–5.3V. Its BYP pin controls soft-start slew rate via an external capacitor (0.001µF–0.1µF), directly modulating startup transient current.

It integrates reverse-current protection triggered at V_IN < V_OUT –10mV, thermal shutdown cycling between +150°C (restart) and +165°C (shutdown), and open-drain POK with 91% V_OUT threshold - all operating reliably from –40°C to +125°C ambient per AEC-Q100 Grade 0.

Key Specifications

Pinout & Package

MAX25300BATA/V+ uses a 2mm × 2mm, 8-pin TDFN package with exposed pad (T822+3C), optimized for thermal dissipation in space-constrained automotive PCBs. The exposed pad must be soldered to a ground plane with ≥4 thermal vias for θ_JA = 102°C/W (4-layer board).

Key Features

Applications

Equivalent & Alternatives

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

Compared with TPS7A8300RGRT and TLS850F0TESA1, MAX25300BATA/V+ uniquely combines automotive qualification, resistor-programmable output, POK signaling, and sub-15µVRMS noise - making it optimal for noise-sensitive, multi-voltage automotive signal chains requiring precise power sequencing.

Availability

MAX25300BATA/V+ is available at Aetrix Electronics and suitable for automotive camera modules, ADAS radar receivers, premium audio systems, and telematics units requiring stable component supply with full AEC-Q100 compliance and long-term production support.

Supply support for MAX25300BATA/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

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

The MAX25300BATA/V+ belongs to Analog Devices' automotive-qualified LDO family, engineered specifically for low-noise, high-accuracy power delivery in safety-critical and sensor-intensive vehicle subsystems.

FAQ

What is the minimum output capacitance required for stability with MAX25300BATA/V+?

The MAX25300BATA/V+ requires a minimum 2µF ceramic output capacitor (X5R/X7R dielectric) for guaranteed stability across temperature and DC bias. This value accounts for capacitance derating - for example, a 4.7µF/6.3V X5R capacitor (e.g., Murata GRM155R60J475ME47) maintains ~2.9µF at 1.8V bias. Using less than 2µF risks oscillation or poor transient response.

How does the POK output on MAX25300BATA/V+ behave during startup and fault conditions?

The POK output on MAX25300BATA/V+ is an open-drain signal that remains low until V_OUT reaches 91% of its target voltage, then pulls high via external pull-up. During overload or shutdown, POK returns low within microseconds. It does not assert during brief line transients (<5µs, 3mV) but responds to sustained undervoltage or thermal shutdown events - enabling robust system reset coordination in automotive ECUs.

Can MAX25300BATA/V+ be used with input voltages below 1.7V?

No. MAX25300BATA/V+ has a guaranteed operating input range of 1.7V to 5.5V per datasheet specifications. Below 1.7V, output accuracy degrades beyond ±1%, dropout increases nonlinearly, and EN threshold behavior becomes undefined. Input undervoltage lockout activates at 1.5V–1.7V (100mV hysteresis), disabling regulation - so operation below 1.7V is neither specified nor recommended.

What is the purpose of the GS (Ground Sense) pin on MAX25300BATA/V+?

The GS (Ground Sense) pin on MAX25300BATA/V+ provides Kelvin sensing of the true system ground potential, separate from the GND pin's power return path. Connecting GS directly to the load-side ground reference compensates for voltage drop across PCB traces or connectors - ensuring ±1% output accuracy is maintained even with up to 50mΩ series resistance between GND and remote ground points.

Does MAX25300BATA/V+ support adjustable soft-start, and how is it configured?

Yes. MAX25300BATA/V+ supports programmable soft-start via the BYP pin: connecting a capacitor (0.001µF–0.1µF) between BYP and OUT sets the output slew rate using StartupSlewRate = (5V/ms) × (0.01µF / C_BYP). A 10nF capacitor yields 5V/ms; a 100nF capacitor reduces slew to 0.5V/ms - controlling inrush current into large output banks and preventing input rail collapse during startup.