Analog Devices Inc./Maxim Integrated MAX25249ATPN/VY+T

Overview

MAX25249ATPN/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 programmable), and one low-noise LDO (50dB PSRR @ 1kHz) - all with ±1.5% output accuracy and ASIL B compliance for surround-view and rear-view camera modules.

For engineers reviewing the MAX25249ATPN/VY+T datasheet, MAX25249ATPN/VY+T pinout, MAX25249ATPN/VY+T application, or MAX25249ATPN/VY+T equivalent, key selection criteria include its 2.2MHz fixed-frequency PWM operation, factory-set sequencing via EN23/EN4, OV/UV fault monitoring with ±1.3% accuracy, AEC-Q100 qualification, and 3.5mm × 3.5mm 20-pin TQFN package optimized for space-constrained automotive imaging systems.

Technical Context

The MAX25249ATPN/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 environments. 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, push-pull or open-drain RESET assertion on OV/UV faults, and overtemperature/short-circuit protection. Factory-programmed output voltages and sequencing enable drop-in compatibility across multiple imager and serializer platforms without firmware changes.

Key Specifications

Pinout & Package

Package: 3.5mm × 3.5mm, 20-pin TQFN (exposed pad), RoHS-compliant, Grade 1 automotive (-40°C to +125°C).

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX25249BTPN/VY+T, the MAX25249ATPN/VY+T offers identical functionality but factory-set for 5V/1.2V/1.8V/2.8V rails - ideal for common Sony/ON Semi sensor platforms. Versus TPS653211AQPWPRQ1, it delivers superior noise suppression, smaller footprint, and ASIL B-ready diagnostics at higher integration density.

Availability

MAX25249ATPN/VY+T is available at Aetrix Electronics and suitable for surround-view camera modules, rear-view camera systems, and front-facing driver monitoring applications requiring stable component supply, AEC-Q100 compliance, and ASIL B functional safety support.

Supply support for MAX25249ATPN/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.

The MAX25249 product line delivers compact, safety-certified power management ICs specifically engineered for next-generation automotive camera systems with demanding noise, size, and functional safety requirements.

FAQ

What is the input voltage range supported by the MAX25249ATPN/VY+T?

The MAX25249ATPN/VY+T supports an input voltage range of 5V to 36V, enabling direct connection to automotive battery rails or power-over-coax (PoC) sources without external pre-regulation. This wide range accommodates cold-crank (5V) and load-dump (36V) transients per ISO 7637-2, and is validated across the full -40°C to +125°C temperature range. The MAX25249ATPN/VY+T uses internal high-voltage gate drivers and robust oxide breakdown margins to sustain this rating reliably.

Does the MAX25249ATPN/VY+T require external compensation components for its buck converters?

No, the MAX25249ATPN/VY+T integrates full Type-II compensation networks for all three buck converters, eliminating the need for external RC networks. Its current-mode architecture and factory-tuned loop response ensure stability with only ceramic output capacitors (minimum 10µF per rail). The MAX25249ATPN/VY+T's internal compensation is optimized for 2.2MHz operation and maintains phase margin >45° across temperature, load, and input voltage variations.

How does the MAX25249ATPN/VY+T implement ASIL B compliance?

The MAX25249ATPN/VY+T achieves ASIL B compliance through redundant internal voltage references, dual OV/UV comparators with cross-check logic, and built-in self-test (BIST) for critical analog blocks - all documented in its ISO 26262 safety manual. It provides diagnostic coverage >90% for single-point faults and supports safe state entry via RESET assertion. The MAX25249ATPN/VY+T's safety features are verified per AEC-Q100 Grade 1 and included in Analog Devices' certified safety element out of context (SEooC) package.

Can the output voltages of the MAX25249ATPN/VY+T be adjusted after manufacturing?

The MAX25249ATPN/VY+T has factory-programmed output voltages (5V/1.2V/1.8V/2.8V) and does not support in-field reprogramming. Voltage selection is performed during wafer sort using laser trimming or EFUSE; no I²C/SPI interface is provided. However, the MAX25249ATPN/VY+T's EN23 and EN4 pins allow flexible sequencing control in-system, and external resistor dividers can be used on feedback nodes for minor post-production tuning - though this voids ASIL B certification and output accuracy guarantees.

What is the thermal performance of the MAX25249ATPN/VY+T in continuous 1.2A operation?

In a standard 4-layer JEDEC PCB layout with 2oz copper and 1cm² exposed thermal pad soldered to internal ground plane, the MAX25249ATPN/VY+T exhibits a junction-to-ambient thermal resistance (θ_JA) of 42°C/W. At 1.2A continuous load on OUT2 or OUT3 with 12V input and 1.2V output, typical junction temperature rise is 55°C above ambient - well within the +125°C max rating. The MAX25249ATPN/VY+T includes thermal shutdown at +150°C with hysteresis to prevent damage during overload conditions.