Analog Devices Inc./Maxim Integrated MAX20057ATIAX/VY+T

Overview

MAX20057ATIAX/VY+T from Analog Devices is an automotive-grade triple-output power management IC integrating two synchronous buck converters (5V/3.3V fixed or 1–14V adjustable, 3.5A/2A) and a 36V asynchronous boost controller with cold-crank support down to 2V input. It operates from 3.5V to 36V, delivers 95% max duty cycle in dropout, and targets mid-to-high-power automotive systems requiring robust regulation during start-stop and cold-crank events.

For engineers reviewing the MAX20057ATIAX/VY+T datasheet, MAX20057ATIAX/VY+T pinout, MAX20057ATIAX/VY+T application, or MAX20057ATIAX/VY+T equivalent, key selection considerations include its dual-phase 2.1MHz/400kHz switching capability, integrated PGOOD indicators per buck rail, spread-spectrum EMI reduction, thermal shutdown at 170°C, and thermally enhanced 5mm × 5mm TQFN-EP package with exposed pad.

Technical Context

The MAX20057ATIAX/VY+T implements valley current-mode control for both buck converters, operating 180° out-of-phase to minimize input ripple across 3.5V–36V input range. Its boost controller uses asynchronous N-MOSFET drive (DL pin), supports preboost during cold crank, and features programmable UVLO (4.5V rising, disableable falling threshold at 2.05V).

FSYNC enables three operational modes: forced PWM (fixed frequency), skip mode (ultra-low quiescent current), or PLL-synchronized external clock locking - with phase alignment between BUCK1/BUCK2 determined by FSYNC duty cycle. Spread spectrum (±6% modulation, 110μs period at 2.1MHz) is factory-configured and disabled during external sync.

Key Specifications

Pinout & Package

MAX20057ATIAX/VY+T is housed in a thermally enhanced 5mm × 5mm, 28-pin TQFN-EP package with exposed pad (EP) connected to AGND for optimal heat dissipation. θ_JA = 27°C/W (4-layer board), θ_JC = 3°C/W.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar automotive PMIC applications.

Compared with MAX20057ATIAX/VY+T, MAX20090ATI/VY+ offers lower integration and no EMI-reduction features, while TPS65321A-Q1 adds safety logic but omits the critical 36V boost controller needed for cold-crank resilience - making MAX20057ATIAX/VY+T uniquely suited for high-reliability automotive power domains requiring all three rails and preboost.

Availability

MAX20057ATIAX/VY+T is available at Aetrix Electronics and suitable for automotive start-stop systems, instrument clusters, navigation head units, and distributed DC power systems requiring stable component supply across extended temperature and voltage ranges.

Supply support for MAX20057ATIAX/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, Inc. is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, serving automotive, industrial, communications, and healthcare markets.

The MAX20057ATIAX/VY+T belongs to Analog Devices' automotive power management portfolio, designed specifically for demanding vehicle electrification applications requiring cold-crank resilience, ultra-low quiescent current, and EMI-compliant multi-rail power delivery.

FAQ

What is the cold-crank input voltage limit supported by the MAX20057ATIAX/VY+T?

The MAX20057ATIAX/VY+T supports cold-crank operation down to 2V battery input when the boost controller is enabled. Its UVLO falling threshold for the boost section is 2.05V (minimum), and this threshold can be disabled to maintain regulation even below 2V - a key feature for automotive start-stop and cranking scenarios where battery voltage collapses transiently.

Does the MAX20057ATIAX/VY+T support external frequency synchronization?

Yes, the MAX20057ATIAX/VY+T supports external frequency synchronization via the FSYNC pin. It uses an internal PLL to lock to external clocks ranging from 250kHz to 2.6MHz. When synchronized, Buck1 aligns its LX1 falling edge to the FSYNC rising edge, Buck2 aligns LX2 falling edge to FSYNC falling edge, and the boost controller aligns DL rising edge to FSYNC falling edge - enabling precise multi-rail timing control.

How does the MAX20057ATIAX/VY+T achieve ultra-low quiescent current in standby mode?

The MAX20057ATIAX/VY+T achieves ultra-low quiescent current through hierarchical enable control and optimized biasing: total supply current drops to 1μA when all EN pins are low; it draws just 10μA with only the 5V buck active and 8μA with only the 3.3V buck active. This is enabled by internal circuitry that disables unused blocks and leverages valley-current-mode control with adaptive gate drive.

Can the MAX20057ATIAX/VY+T operate without using the internal BIAS LDO?

Yes, the MAX20057ATIAX/VY+T can bypass the internal 5V BIAS LDO using the EXTVCC pin. Applying a valid 3.25V–5.5V supply (e.g., from a buck output) to EXTVCC switches internal biasing to that source, disabling the LDO and reducing IC power dissipation. If VEXTVCC falls below ~3V, the internal LDO automatically re-enables and BIAS resumes regulation at 5V.

What protection features are integrated into the MAX20057ATIAX/VY+T?

The MAX20057ATIAX/VY+T integrates cycle-by-cycle current limiting on all three channels, thermal shutdown at 170°C with 20°C hysteresis, undervoltage lockout per rail (including BIAS UVLO at 3.1V rising/2.6V falling), and hiccup-mode recovery during sustained overcurrent. Each buck converter also includes dedicated PGOOD outputs with 93.5%/95% voltage thresholds for system-level fault detection and sequencing.