Analog Devices Inc./Maxim Integrated MAX17570AATA+T

Overview

MAX17570AATA+T from Analog Devices is a 4.5V to 60V input, 3.3V fixed-output, 300mA synchronous step-down DC-DC converter in an ultra-compact 2mm × 2mm TDFN-8 package. It integrates high-side pMOS and low-side nMOS FETs (R_DS(on)H = 2.76Ω max, R_DS(on)L = 1Ω max), features internal compensation, programmable 200kHz–1MHz switching frequency, and delivers 95.8% peak efficiency at 15V_IN/12V_OUT/150mA - ideal for space-constrained industrial point-of-load and factory automation power rails.

For engineers reviewing the MAX17570AATA+T datasheet, MAX17570AATA+T pinout, MAX17570AATA+T application, or MAX17570AATA+T equivalent, key selection criteria include its -40°C to +125°C ambient operating range, hiccup-mode overcurrent protection, open-drain RESET output with 92–95% V_OUT thresholds, monotonic startup into prebiased outputs, and compliance with CISPR32 Class B emissions - all critical for robust, thermally constrained embedded systems.

Technical Context

The MAX17570AATA+T employs a current-mode PWM control architecture with internal slope compensation and cycle-by-cycle peak current limiting (0.56A typ). Its integrated 5V LDO (V_CC) powers internal circuitry and gate drivers, with 4.75V–5.25V regulation and 30mA current limit. The device supports monotonic soft-start (512 cycles) and operates exclusively in PWM mode - unlike PFM variants (D/E/F), it maintains fixed-frequency operation across all load conditions without pulse skipping.

It implements dual-level overcurrent protection: a 0.56A peak limit for immediate cycle-by-cycle shutdown and a 0.66A runaway limit triggering hiccup mode (32768-cycle timeout). Thermal shutdown activates at 166°C with 20°C hysteresis, and the EN/UVLO pin allows programmable input undervoltage lockout (1.215V rising threshold) via external resistor divider.

Key Specifications

Pinout & Package

Package: 8-pin, 2mm × 2mm TDFN (Package Code T822C+6C), exposed pad for thermal dissipation (θ_JA = 162°C/W on 4-layer board).

Key Features

Applications

Equivalent & Alternatives

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

Compared with LM5164QDDARQ1 and TPS54202DRCT, the MAX17570AATA+T uniquely combines 60V input capability, fixed 3.3V output, integrated RESET, and prebias startup in a 2mm × 2mm footprint - making it optimal for thermally constrained, wide-input industrial point-of-load designs where layout simplicity and reliability are prioritized over automotive qualification or higher current.

Availability

MAX17570AATA+T 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 assurance, and RoHS-compliant sourcing.

Supply support for MAX17570AATA+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 industrial, automotive, communications, and healthcare markets.

The MAX17570 belongs to Analog Devices' high-voltage synchronous buck converter product line, designed specifically for robust, ultra-compact power conversion in adverse industrial environments - emphasizing wide input range, integrated protection, and minimal external component count.

FAQ

What is the output voltage tolerance of the MAX17570AATA+T?

The MAX17570AATA+T provides a 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 ensures compatibility with 3.3V logic families and ADC reference inputs without additional post-regulation.

Does the MAX17570AATA+T support external clock synchronization?

Yes, the MAX17570AATA+T supports external clock synchronization via the RT/SYNC pin, enabling noise-sensitive applications to align switching frequency with system clocks and reduce beat frequencies. Synchronization is valid for frequencies between 1.1× and 1.4× the programmed f_SW, with pulse width >100ns and duty cycle 10–90%. Note that this feature is disabled in PFM variants (D/E/F) but fully functional in the PWM-only MAX17570AATA+T.

What protection features does the MAX17570AATA+T include?

The MAX17570AATA+T integrates hiccup-mode current limiting (triggered by 0.66A runaway limit or 65% V_OUT drop), thermal shutdown at 166°C with 20°C hysteresis, open-drain RESET output with 92–95% V_OUT thresholds, and monotonic startup into prebiased outputs. These protections ensure reliable operation during short circuits, overtemperature, brownouts, and multi-rail power sequencing - all confirmed in the device's Functional Diagram and Applications Information sections.

Can the MAX17570AATA+T operate with ceramic capacitors only?

Yes, the MAX17570AATA+T is explicitly designed for all-ceramic capacitor operation. Its internal compensation and current-mode control architecture stabilize with low-ESR X7R ceramic input (≥1μF) and output (calculated per application) capacitors - eliminating electrolytics, reducing footprint, and improving lifetime reliability in high-temperature deployments.

What is the minimum controllable on-time for the MAX17570AATA+T?

The MAX17570AATA+T has a minimum controllable on-time of 130ns (max) across temperature, enabling high-step-down ratios at high switching frequencies. This parameter directly determines the maximum input voltage support for a given output voltage and f_SW, as shown in the Operating Input Voltage Range equations on page 19 of the datasheet - critical for designing 60V-input systems delivering 3.3V output.