Analog Devices Inc./Maxim Integrated MAX17570BATA+

Overview

MAX17570BATA+ from Analog Devices is a 4.5V to 60V input, 5V fixed-output, 300mA synchronous step-down DC-DC converter in an 8-pin 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 hiccup-mode current limiting, open-drain RESET, and -40°C to +125°C ambient operation - deployed in factory automation power rails where compact size and thermal robustness are critical.

For engineers reviewing the MAX17570BATA+ datasheet, MAX17570BATA+ pinout, MAX17570BATA+ application, or MAX17570BATA+ equivalent, key selection considerations include its fixed 5V output (±1.4% regulation), programmable EN/UVLO threshold (1.215V typ rising), 200kHz–1MHz adjustable switching frequency via RT resistor, PFM/PWM mode distinction (MAX17570B is PWM-only), and compliance with CISPR32 Class B emissions.

Technical Context

The MAX17570BATA+ implements a current-mode, fixed-frequency PWM control architecture with internal compensation and monotonic soft-start (512 cycles). Its integrated dual MOSFETs enable synchronous rectification without external Schottky diodes, while the error amplifier compares VOUT/FB against a 0.9V internal reference (for MAX17570B) to regulate output voltage.

Protection logic 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 32768 cycles. The open-drain RESET pin asserts low when VOUT/FB falls below 92% of nominal and releases after 1024 cycles once VOUT/FB exceeds 95%.

Key Specifications

Pinout & Package

Package: 8-pin, 2mm × 2mm, 0.5mm pitch TDFN (package code T822C+6C), RoHS-compliant, with θ_JA = 162°C/W on four-layer board.

Key Features

Applications

Equivalent & Alternatives

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

Compared with LM5164QDDARQ1 and TPS54340DDAR, the MAX17570BATA+ offers the smallest PCB footprint (4 mm²), lowest component count (no external FETs or compensation), and tightest 5V regulation (±1.4%), making it optimal for space- and cost-sensitive 300mA industrial point-of-load applications - but not suitable for automotive qualification or >300mA loads.

Availability

MAX17570BATA+ is available at Aetrix Electronics and suitable for factory automation sensors, aftermarket asset trackers, and industrial PLC I/O modules requiring stable component supply, long-term lifecycle support, and guaranteed traceability.

Supply support for MAX17570BATA+ 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.

The MAX17570 belongs to Analog Devices' high-voltage synchronous buck converter product line, designed specifically for reliable, compact, and efficient point-of-load regulation in harsh industrial environments where wide input range, thermal resilience, and EMI compliance are non-negotiable.

FAQ

What output voltage does the MAX17570BATA+ deliver, and is it adjustable?

The MAX17570BATA+ delivers a fixed 5.0V output with ±1.4% regulation accuracy over temperature and load. It is not adjustable - unlike the MAX17570C/F variants, the 'B' suffix denotes a factory-trimmed 5V option where VOUT/FB connects directly to the output without external resistor dividers. This simplifies design and improves stability for dedicated 5V rail applications.

Does the MAX17570BATA+ support external clock synchronization?

Yes, the MAX17570BATA+ supports external clock synchronization via the RT/SYNC pin, as it belongs to the MAX17570A/B/C PWM-only variant group. The SYNC function accepts an external clock between 1.1× and 1.4× the programmed switching frequency, with pulse width >100ns and duty cycle 10–90%. Note that SYNC is disabled in PFM variants (D/E/F), but fully functional in MAX17570BATA+.

What is the maximum junction temperature and thermal protection behavior of the MAX17570BATA+?

The MAX17570BATA+ triggers thermal shutdown at 166°C junction temperature and remains latched off until the junction cools by 20°C hysteresis. During shutdown, both internal MOSFETs turn off, halting switching and minimizing power dissipation. The device resumes normal operation automatically once temperature falls below 146°C. This protects against permanent damage during sustained overload or poor heatsinking.

How does the RESET pin on the MAX17570BATA+ behave during startup and fault conditions?

The RESET pin on the MAX17570BATA+ is an open-drain output that goes high-impedance 1024 switching cycles after VOUT/FB rises above 95% of 5V (i.e., 4.75V), indicating valid regulation. It pulls low when VOUT/FB falls below 92% (4.6V). During hiccup-mode overcurrent events, RESET remains asserted low throughout the 32768-cycle timeout period, providing unambiguous system-level fault signaling.

Can the MAX17570BATA+ start up into a prebiased output, and why does that matter?

Yes, the MAX17570BATA+ supports monotonic startup into a prebiased output - meaning it will not discharge an already-charged output capacitor during power-up. This is essential in multi-rail systems (e.g., FPGAs or processors with sequenced power domains) where downstream circuits may retain residual voltage on the 5V rail. Preventing reverse current avoids damaging logic inputs or causing unpredictable resets.