Analog Devices Inc./Maxim Integrated MAX17570EATA+T

Overview

MAX17570EATA+T from Analog Devices is a 4.5V to 60V input, 5V fixed-output, 300mA synchronous step-down DC-DC converter in an ultra-compact 2mm × 2mm TDFN package. It integrates high-side pMOS and low-side nMOS FETs (R_DS-ONH = 2.76Ω max, R_DS-ONL = 1Ω max), delivers 95.8% peak efficiency at 15V_IN/12V_OUT/150mA, and features programmable EN/UVLO, open-drain RESET, and hiccup-mode overcurrent protection - deployed in factory automation power rails where thermal management and small footprint are critical.

For engineers reviewing the MAX17570EATA+T datasheet, MAX17570EATA+T pinout, MAX17570EATA+T application, or MAX17570EATA+T equivalent, key selection considerations include its 5V fixed output (±1.8% regulation), -40°C to +125°C ambient operation, PFM light-load mode (for <150mA), 200kHz–1MHz adjustable switching frequency via RT resistor, and compliance with CISPR32 Class B emissions - all validated for industrial point-of-load and aftermarket automotive asset tracking systems.

Technical Context

The MAX17570EATA+T implements a current-mode control architecture with internal slope compensation, fixed 5V output (V_FB-REG = 0.915V typ, per MAX17570E variant), and monotonic startup into prebiased outputs. Its integrated 5V LDO (V_CC) powers internal logic and gate drivers, with 4.75V–5.25V output and 30mA current limit.

It supports dual operating modes: PFM at light loads (enabling 145μA quiescent current) and forced PWM under heavy load or external sync (not available in PFM variants). Protection includes cycle-by-cycle peak current limiting (0.56A typ), runaway current limit (0.66A typ), thermal shutdown at 166°C (20°C hysteresis), and hiccup-mode recovery after fault clearance.

Key Specifications

Pinout & Package

MAX17570EATA+T is housed in an 8-pin, 2mm × 2mm, 0.5mm pitch TDFN package (package code T822C+6C) with exposed thermal pad for enhanced heat dissipation in high-power-density layouts.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar synchronous step-down DC-DC converter applications.

Compared with LM5165QDGSRQ1 and TPS54202DDCR, the MAX17570EATA+T uniquely combines 60V input capability, integrated 300mA FETs, PFM light-load efficiency, and industrial temperature grade in a 2mm × 2mm footprint - making it the only option among the three qualified for harsh-environment 5V point-of-load conversion without design compromise.

Availability

MAX17570EATA+T is available at Aetrix Electronics and suitable for factory automation sensor nodes, aftermarket automotive asset trackers, and ruggedized edge gateway power rails requiring stable component supply, long-term industrial lifecycle support, and RoHS-compliant packaging.

Supply support for MAX17570EATA+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 with precision power, sensing, and timing solutions.

The MAX17570EATA+T belongs to Analog Devices' high-voltage synchronous buck converter product line, engineered specifically for compact, efficient, and robust point-of-load regulation in electrically noisy and thermally demanding industrial and transportation systems.

FAQ

What is the output voltage tolerance of the MAX17570EATA+T over temperature and line/load conditions?

The MAX17570EATA+T provides a fixed 5V output with ±1.8% total regulation tolerance across -40°C to +125°C ambient temperature, 4.5V to 60V input range, and 0–300mA load. This is verified by the Electrical Characteristics table specifying V_OUT = 4.93V (min) to 5.18V (max) at TA = -40°C to +125°C - ensuring compatibility with 5V-tolerant microcontrollers and peripherals without external trimming.

Does the MAX17570EATA+T support external clock synchronization?

No, the MAX17570EATA+T does not support external clock synchronization. As a PFM-capable variant (MAX17570E), its RT/SYNC pin functions only as a resistor-programmable oscillator input (200kHz–1MHz). The SYNC functionality is explicitly disabled per the datasheet's "Detailed Description" section - unlike PWM-only versions (MAX17570A/B/C) which allow external clock injection.

What is the purpose of the VCC pin on the MAX17570EATA+T, and how should it be decoupled?

The VCC pin on the MAX17570EATA+T is the output of an internal 5V LDO that powers gate drivers and internal logic. It must be bypassed with a minimum 1μF X7R ceramic capacitor placed as close as possible to the pin and GND. This decoupling stabilizes the LDO under transient load and prevents oscillation - critical because VCC dropout (0.3V max) and UVLO (3.7V–3.95V falling) directly impact converter enablement and reliability.

How does the hiccup-mode overcurrent protection work in the MAX17570EATA+T?

In the MAX17570EATA+T, hiccup-mode activates upon detection of runaway current (>0.66A) or sustained output undervoltage (<65% of nominal). The device suspends switching for 32768 cycles (at half the programmed f_SW), then attempts soft-start again. This cycle repeats until the fault clears - limiting average power dissipation to safe levels during short-circuit conditions while maintaining automatic recovery without manual reset.

Can the MAX17570EATA+T start up into a prebiased output, and why is this important?

Yes, the MAX17570EATA+T supports monotonic startup into a prebiased output - meaning it will not discharge the output capacitor when enabled into an already charged rail. This is essential in multi-rail systems (e.g., FPGAs with staggered power sequencing) to prevent bus contention, latch-up, or unintended resets caused by reverse current flow during power-up.