Analog Devices Inc./Maxim Integrated MAX17645DATA+T

Overview

MAX17645DATA+T from Analog Devices is a 4.5V to 36V input, 1A synchronous step-down DC-DC converter in an 8-pin TDFN (2mm × 2mm) package, featuring PFM mode for high light-load efficiency, internal compensation, and integrated high-side pMOS/low-side nMOS FETs. It delivers regulated output from 0.9V up to 89% of VIN and is used in compact industrial power supplies requiring robust thermal performance and low quiescent current.

For engineers reviewing the MAX17645DATA+T datasheet, MAX17645DATA+T pinout, MAX17645DATA+T application, or MAX17645DATA+T equivalent, key selection criteria include its 650kHz fixed switching frequency, ±1.1% FB regulation accuracy over –40°C to +125°C, 2.2µA shutdown current, hiccup-mode overload protection, and prebiased soft-start capability - all critical for factory automation and asset-tracking power designs.

Technical Context

The MAX17645DATA+T implements peak-current-mode control with a 650kHz oscillator and built-in slope compensation. Its PFM operation disables negative inductor current and skips pulses at light loads, achieving higher efficiency than PWM variants while accepting higher output ripple.

It integrates a 5V LDO (VCC) powered from VIN, features monotonic startup into prebiased outputs, and uses an open-drain RESET comparator monitoring FB at 92–95.5% of set voltage with 1.6ms delay. Protection includes cycle-by-cycle peak current limit (1.88A typ), runaway current limit (2.44A typ), and thermal shutdown at 166°C with 10°C hysteresis.

Key Specifications

Pinout & Package

Package: 8-pin TDFN (2mm × 2mm, Package Code T822CN+1), RoHS-compliant, with exposed thermal pad for enhanced heat dissipation (θJA = 72°C/W on 4-layer board).

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX17645BATA+T, the MAX17645DATA+T offers superior battery runtime in intermittent-use systems due to PFM's 115µA typical quiescent current, while LM61480RQWR trades integration and protection for higher output capability and bandwidth - making MAX17645DATA+T optimal for compact, low-power, thermally constrained 1A designs.

Availability

MAX17645DATA+T is available at Aetrix Electronics and suitable for factory automation power supplies, automotive asset trackers, industrial point-of-load converters, and ruggedized edge sensor nodes requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for MAX17645DATA+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 MAX17645 product line delivers highly integrated, robust synchronous buck regulators optimized for space-constrained, thermally demanding applications where reliability, efficiency, and minimal external components are critical.

FAQ

What is the maximum duty cycle supported by the MAX17645DATA+T?

The MAX17645DATA+T supports a maximum duty cycle of 89% to 94%, enabling output voltages up to 89% of the input voltage. This allows efficient conversion from 12V or 24V rails down to 5V or 3.3V without requiring cascaded regulation stages. The actual achievable duty cycle depends on input/output voltage ratio, MOSFET RDS-ON, and inductor DCR per the device's operating equations.

Does the MAX17645DATA+T support startup into a prebiased output?

Yes, the MAX17645DATA+T supports monotonic startup into a prebiased output without discharging the output capacitor - a key feature for multi-rail systems where other supplies may already be active. This behavior is confirmed in both PFM and forced-PWM modes and is enabled by internal control logic that prevents reverse current flow during soft-start ramp.

What is the function of the RESET pin on the MAX17645DATA+T?

The RESET pin on the MAX17645DATA+T is an open-drain output that signals power-good status. It goes high-impedance 1.6ms after FB rises above 95.5% of the nominal output voltage and pulls low when FB falls below 92% of nominal. It also asserts low during hiccup-mode timeout and thermal shutdown, providing system-level fault indication without requiring external monitoring circuitry.

How does the MAX17645DATA+T differ from the MAX17645BATA+T variant?

The MAX17645DATA+T operates in PFM mode at light loads for higher efficiency and lower quiescent current (115µA typ), while the MAX17645BATA+T uses forced PWM mode (3.85mA IQ). Both share identical pinout, package, input range, and protection features. The choice depends on whether fixed-frequency operation or ultra-low sleep current is prioritized in the target application.

What thermal protection mechanisms does the MAX17645DATA+T include?

The MAX17645DATA+T includes thermal shutdown protection that disables switching when junction temperature exceeds 166°C (typ), with 10°C hysteresis for automatic recovery. It also features hiccup-mode overload protection triggered by runaway current limit events, suspending operation for 100ms to limit average power dissipation during sustained overloads or short circuits - critical for maintaining reliability in unventilated enclosures.