Analog Devices Inc./Maxim Integrated MAX17570AATA+

Overview

MAX17570AATA+ from Analog Devices is a 4.5V to 60V input, 3.3V 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, features internal compensation, programmable switching frequency (200kHz–1MHz), and delivers 95.8% peak efficiency at 15V_IN/12V_OUT/150mA - optimized for space-constrained industrial power rails.

For engineers reviewing the MAX17570AATA+ datasheet, MAX17570AATA+ pinout, MAX17570AATA+ application, or MAX17570AATA+ equivalent, key selection criteria include its -40°C to +125°C ambient operation, hiccup-mode overcurrent protection, open-drain RESET output with 92–95% V_OUT thresholds, monotonic startup into prebiased outputs, and PFM/PWM mode distinction (this variant operates in PWM-only mode).

Technical Context

The MAX17570AATA+ implements a current-mode control architecture with internal slope compensation, fixed-frequency PWM operation across all load conditions, and cycle-by-cycle peak current limiting at 0.56A (typ). Its integrated 1.38Ω high-side and 0.5Ω low-side MOSFETs enable ultra-compact designs using all-ceramic capacitors and eliminate external Schottky diodes.

It incorporates a 5V internal LDO (VCC) with 4.75V–5.25V regulation, programmable EN/UVLO threshold (1.215V rising), and a dedicated RT/SYNC pin supporting resistor-based frequency setting (4.7kΩ → 200kHz) or external clock synchronization - though SYNC is disabled in PFM variants and MAX17570A is a PWM-only part per datasheet Table 1 and Functional Diagram.

Key Specifications

Pinout & Package

Package: 8-pin, 2mm × 2mm, 0.5mm pitch TDFN (package code T822C+6C), thermally enhanced with exposed pad (connected to GND per layout guidelines).

Key Features

Applications

Equivalent & Alternatives

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

Compared with LM5164QDDARQ1 and TPS54202HDDCR, the MAX17570AATA+ offers the smallest total solution size, lowest component count (no external FETs or compensation), and unique monotonic prebias startup - making it optimal for space- and reliability-critical industrial PoL applications where 300mA suffices.

Availability

MAX17570AATA+ is available at Aetrix Electronics and suitable for factory automation sensors, aftermarket asset trackers, and industrial HMI displays requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.

Supply support for MAX17570AATA+ 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. (ADI) 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 ADI's high-voltage synchronous buck converter product line, designed specifically for robust, compact, and efficient point-of-load power in harsh industrial environments - emphasizing thermal resilience, EMI compliance, and minimal external component count.

FAQ

What is the output voltage tolerance of the MAX17570AATA+?

The MAX17570AATA+ provides a factory-trimmed fixed 3.3V output with ±1.5% regulation tolerance over full temperature and load range, as specified in the Electrical Characteristics table (V_OUTREG = 3.25V to 3.35V at T_A = -40°C to +125°C). This tight tolerance eliminates need for post-production calibration in precision 3.3V logic rail applications.

Does the MAX17570AATA+ support external clock synchronization?

Yes, the MAX17570AATA+ supports external clock synchronization via the RT/SYNC pin. As a PWM-only variant (MAX17570A), it accepts external clocks between 1.1× and 1.4× its programmed switching frequency, with pulse width >100ns and duty cycle 10–90%. This feature enables noise-sensitive systems to align switching edges and reduce beat frequencies.

How does the MAX17570AATA+ handle startup into a prebiased output?

The MAX17570AATA+ performs monotonic startup into prebiased outputs by disabling negative inductor current and controlling gate drive timing to prevent reverse current flow. This ensures safe power-up of 3.3V rails already charged by other regulators - critical for multi-rail systems like FPGA-based industrial controllers where sequencing violations must be avoided.

What is the thermal shutdown behavior of the MAX17570AATA+?

The MAX17570AATA+ activates thermal shutdown at 166°C junction temperature, turning off both internal MOSFETs until the die cools by 20°C hysteresis. During shutdown, VCC remains active to maintain bias, and the device resumes normal operation automatically upon cooldown - preventing permanent latch-up while protecting against sustained overtemperature conditions.

Can the MAX17570AATA+ operate with only ceramic capacitors?

Yes, the MAX17570AATA+ is explicitly designed for all-ceramic capacitor operation. Its internal compensation and current-mode control ensure stability with low-ESR X7R ceramics on both input (≥1μF) and output (calculated per load transient requirements), eliminating need for bulk electrolytics and enabling ultra-thin, high-reliability PCB layouts.