Analog Devices Inc./Maxim Integrated MAX25249ATPAA/VY+T

Overview

MAX25249ATPAA/VY+T from Analog Devices is a four-output automotive-grade PMIC for camera power management, integrating one 1A high-voltage buck (5V–36V input, 5V fixed output), two 1.2A low-voltage bucks (0.8V–3.9875V, 12.5mV steps), and a low-noise LDO (50dB PSRR at 1kHz) for image sensor rails. It features ±1.5% output voltage accuracy, ASIL B compliance, and operates from –40°C to +125°C.

For engineers reviewing the MAX25249ATPAA/VY+T datasheet, MAX25249ATPAA/VY+T pinout, MAX25249ATPAA/VY+T application, or MAX25249ATPAA/VY+T equivalent, key selection criteria include its 2.2MHz fixed-frequency PWM operation, factory-programmable sequencing via EN23/EN4, OV/UV monitoring with ±1.3% accuracy, RESET signaling, and AEC-Q100 qualification for surround-view and rear-view camera systems.

Technical Context

The MAX25249ATPAA/VY+T implements current-mode, forced-PWM control across all three synchronous buck converters to ensure stable transient response and noise immunity in EMI-sensitive camera modules. Its integrated low-R_DS(ON) MOSFETs eliminate external high-side switches and simplify layout while maintaining >90% efficiency at full load.

Internal diagnostics include redundant voltage reference circuitry, overtemperature shutdown, cycle-by-cycle overcurrent protection, and independent OV/UV comparators per output feeding a push-pull or open-drain RESET signal. Sequencing is controlled by dedicated EN23 (enables OUT2/OUT3 jointly) and EN4 (enables OUT4) pins, with factory-set output voltages eliminating external resistor networks.

Key Specifications

Pinout & Package

Package: 3.5mm × 3.5mm, 20-pin TQFN (exposed pad), RoHS-compliant, moisture sensitivity level 3.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar multi-rail camera PMIC applications.

Compared with MAX25249BTPAA/VY+T, the MAX25249ATPAA/VY+T provides factory-set 1.2V/2.8V for common CIS+serializer pairs, while TPS65910A3RSLR offers more rails but sacrifices PSRR, spread-spectrum, and ASIL B compliance - making MAX25249ATPAA/VY+T optimal for safety-critical vision systems.

Availability

MAX25249ATPAA/VY+T is available at Aetrix Electronics and suitable for surround-view camera modules, rear-view systems, driver-monitoring units, and in-cabin occupancy detection requiring stable component supply, AEC-Q100 assurance, and ASIL B functional safety support.

Supply support for MAX25249ATPAA/VY+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 automotive, industrial, communications, and healthcare markets since 1965.

The MAX25249 product line targets automotive camera power architectures, designed specifically to replace discrete DC-DC + LDO solutions with integrated, ASIL B-compliant, low-EMI PMICs for CIS, serializer, and MCU rail generation.

FAQ

What is the maximum output current supported by each rail of the MAX25249ATPAA/VY+T?

The MAX25249ATPAA/VY+T delivers up to 1A on OUT1 (5V fixed), 1.2A on both OUT2 and OUT3 (programmable 0.8V–3.9875V), and up to 300mA on OUT4 (LDO). Current limits are enforced by internal cycle-by-cycle overcurrent protection, and all rails maintain ±1.5% voltage accuracy across their rated load ranges. The MAX25249ATPAA/VY+T datasheet specifies derating curves for ambient temperature above 85°C.

Does the MAX25249ATPAA/VY+T support spread-spectrum frequency modulation, and how is it configured?

Yes, the MAX25249ATPAA/VY+T integrates programmable spread-spectrum frequency modulation to reduce peak radiated emissions. It is enabled by default and requires no external components or configuration pins - the modulation depth and rate are factory-trimmed. This feature lowers EMI by >10dB at the 2.2MHz fundamental, aiding compliance with CISPR 25 Class 5 in camera module designs. The MAX25249ATPAA/VY+T does not provide user-disable capability for this function.

How is power sequencing implemented on the MAX25249ATPAA/VY+T, and what pins control it?

Sequencing on the MAX25249ATPAA/VY+T is controlled via dedicated enable pins: EN23 activates both OUT2 and OUT3 simultaneously, while EN4 independently enables OUT4. OUT1 powers up automatically upon valid IN voltage. Delay between rails is set by external soft-start capacitors on SS pins and internal factory programming. No external timers or microcontroller intervention is needed. The MAX25249ATPAA/VY+T supports flexible startup order for CIS, serializer, and MCU subsystems.

Is the MAX25249ATPAA/VY+T qualified for automotive applications, and what standards does it meet?

Yes, the MAX25249ATPAA/VY+T is AEC-Q100 Grade 1 qualified (–40°C to +125°C) and compliant with ASIL B per ISO 26262. It includes redundant internal voltage references, OV/UV monitoring with ±1.3% accuracy, and fault reporting via RESET. These features are validated across temperature, voltage, and lifetime stress tests. The MAX25249ATPAA/VY+T is intended for safety-related camera systems where functional integrity must be maintained under fault conditions.

Can the MAX25249ATPAA/VY+T be used with image sensors requiring ultra-low-noise analog supply?

Yes, the MAX25249ATPAA/VY+T includes OUT4 - a dedicated low-noise, high-PSRR LDO delivering up to 300mA with 50dB rejection at 1kHz and 35dB at 100kHz. This rail is specifically designed for CIS analog front-ends, isolating them from switching noise generated by the three integrated bucks. Layout guidelines in the MAX25249ATPAA/VY+T datasheet emphasize separate GND planes and ferrite-bead filtering for optimal PSRR performance.