Analog Devices Inc./Maxim Integrated MAX17244ETERB+T

Overview

MAX17244ETERB+T from Maxim Integrated is a 3.5V–36V input, 2.5A synchronous step-down DC-DC converter with integrated high-side and low-side MOSFETs, fixed 5V/3.3V or adjustable 1V–10V output, 28µA quiescent current, and 42V transient protection. It operates in PWM or PFM mode and supports external synchronization for EMI-sensitive RF power supplies.

For engineers reviewing the MAX17244ETERB+T datasheet, MAX17244ETERB+T pinout, MAX17244ETERB+T application, or MAX17244ETERB+T equivalent, key selection criteria include input transient tolerance (42V), light-load efficiency optimization (PFM/FPWM mode control via FSYNC), programmable switching frequency (220kHz–2.2MHz), and thermal shutdown with automatic recovery at +175°C.

Technical Context

The MAX17244ETERB+T employs current-mode control with cycle-by-cycle current limiting and automatic LX slew-rate adjustment-4ns rise time above 1.1MHz, 8ns below-to minimize EMI while maintaining efficiency. Its dual supply inputs (SUP and SUPSW) enable stable operation down to 3.5V input and dropout support up to 98% duty cycle.

It integrates a 5V BIAS linear regulator (±2% accuracy), open-drain PGOOD output with 95%/92% VFB thresholds, and SYNCOUT delivering 180° out-of-phase clock for cascaded buck stages. The FSYNC pin selects between PFM (FSYNC = AGND) and forced-PWM (FSYNC = BIAS or external clock), with acquisition within one cycle.

Key Specifications

Pinout & Package

MAX17244ETERB+T is housed in a 16-pin TQFN package (5mm × 5mm, 0.5mm pitch) with exposed pad (EP) connected to PGND for thermal dissipation. Pin count and layout match the TSSOP variant but offer lower θJA (35°C/W vs. 38.3°C/W) and improved power handling.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar synchronous buck converter applications.

Compared with LM61480RQRVCRQ1 and TPS54202HDDCR, MAX17244ETERB+T uniquely combines 42V transient protection, integrated PGOOD and SYNCOUT, programmable FPWM/PFM mode selection, and all-ceramic capacitor compatibility-making it optimal for space-constrained, EMI-sensitive, and automotive-qualified designs requiring ≤2.5A.

Availability

MAX17244ETERB+T is available at Aetrix Electronics and suitable for automotive body electronics, industrial PLCs, RF transceiver power supplies, and smart meter auxiliary rails requiring stable component supply, long-term lifecycle support, and guaranteed traceable sourcing.

Supply support for MAX17244ETERB+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

Maxim Integrated, now part of Analog Devices, designs precision analog, mixed-signal, and power management ICs for demanding industrial, automotive, and communications applications.

The MAX17244 is part of Maxim's high-efficiency, wide-input synchronous buck converter family targeting compact, low-EMI power supplies in automotive infotainment, telematics, and industrial edge nodes.

FAQ

What is the maximum input voltage transient the MAX17244ETERB+T can withstand?

The MAX17244ETERB+T is rated for 42V input transients lasting ≤50ns under normal operation and loads up to 2.5A. This self-protection eliminates the need for external TVS diodes in many automotive cold-crank and load-dump scenarios, simplifying design and reducing BOM cost. The device remains functional after such events without latch-up or degradation.

How does the FSYNC pin control operating mode in the MAX17244ETERB+T?

In the MAX17244ETERB+T, FSYNC selects between PFM and forced-PWM (FPWM) modes: tying FSYNC to AGND enables PFM for highest light-load efficiency, while connecting it to BIAS or an external clock forces FPWM for constant-frequency operation. The device synchronizes to an external clock within one cycle, and reverts to internal oscillation if the clock is absent for >2 cycles.

Can the MAX17244ETERB+T generate a 3.3V output, and what is its accuracy?

Yes, the MAX17244ETERB+T provides a factory-trimmed fixed 3.3V output option (MAX17244B variant) with ±2% accuracy over temperature and line-verified at 3.234V to 3.366V in FPWM mode. For adjustable outputs, connect FB to a resistor divider from OUT to AGND using VFB = 1.0V reference to set voltages from 1V to 10V.

What package type and thermal performance does the MAX17244ETERB+T use?

The MAX17244ETERB+T uses a 16-pin TQFN package (5mm × 5mm, 0.5mm pitch) with exposed pad. Its junction-to-ambient thermal resistance is 35°C/W on a multilayer board, enabling 2.5A continuous operation at +70°C ambient without forced airflow. The EP must be soldered to a large contiguous PGND copper area for effective heat dissipation.

Does the MAX17244ETERB+T support interleaved operation with other converters?

Yes, the MAX17244ETERB+T includes a dedicated SYNCOUT pin that delivers a 180° out-of-phase clock signal relative to its internal oscillator. By connecting SYNCOUT of one MAX17244ETERB+T to the FSYNC pin of another, designers achieve precise interleaving-reducing input ripple, lowering RMS input capacitor stress, and increasing total system power capability without additional controllers.