Analog Devices Inc./Maxim Integrated MAXM17633AMG+T

Overview

The MAXM17633AMG+T from Maxim Integrated is a fixed-output 3.3V, 2A synchronous step-down DC-DC power module with integrated controller, MOSFETs, compensation, and inductor. It operates from 4.5V to 36V input, delivers ±1.2% feedback accuracy, supports 400kHz–2.2MHz adjustable switching frequency, and features programmable soft-start and open-drain power-good output. It is used in industrial control power supplies and high-voltage single-board systems.

For engineers reviewing the MAXM17633AMG+T datasheet, MAXM17633AMG+T pinout, MAXM17633AMG+T application, or MAXM17633AMG+T equivalent, this page provides verified technical context, package mapping, key design parameters (input range, output accuracy, thermal limits), and real-world alternative options for point-of-load regulation in space-constrained industrial and telecom applications.

Technical Context

The MAXM17633AMG+T employs peak-current-mode control architecture with internal compensation, eliminating external loop components. It supports three operating modes-PWM, PFM, and DCM-selected via the MODE/SYNC pin, enabling optimization for efficiency across load ranges.

It integrates a 5V LDO (VCC) with 4.75V–5.25V output and 30mA current limit, plus an EXTVCC switchover threshold at 4.7V (typ). The device implements hiccup-mode overcurrent protection, thermal shutdown at 165°C (10°C hysteresis), and meets CISPR22 Class B conducted/radiated emissions standards without external filtering.

Key Specifications

Pinout & Package

The MAXM17633AMG+T is housed in a 24-pin, 4mm × 4mm × 1.75mm uSLIC™ package (package code M244A4+1), featuring exposed thermal pad for enhanced heat dissipation and RoHS-compliant construction.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar step-down power module applications.

Compared with MAXM17634AMG+T, the MAXM17633AMG+T provides identical performance and integration at 3.3V, making it optimal for modern low-voltage logic; versus LMZ31503RKGT, it offers wider input range (4.5–36V vs. 4.5–17V) and superior thermal resistance (25°C/W vs. ~32°C/W), reducing heatsinking needs in high-ambient environments.

Availability

MAXM17633AMG+T is available at Aetrix Electronics and suitable for industrial control power supplies, general-purpose point-of-load regulation, and distributed supply regulation requiring stable component supply, long-term lifecycle support, and consistent parametric performance.

Supply support for MAXM17633AMG+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 high-performance analog and mixed-signal ICs for industrial, automotive, communications, and computing markets.

The Himalaya uSLIC™ power module product line delivers fully integrated, easy-to-use DC-DC solutions targeting space-constrained, thermally demanding applications where reliability and fast time-to-market are critical.

FAQ

What is the output voltage tolerance of the MAXM17633AMG+T?

The MAXM17633AMG+T has a fixed 3.3V output with ±1.2% regulation accuracy over line, load, and temperature. This specification is guaranteed across the full −40°C to +125°C ambient operating range and ensures compatibility with tight-tolerance digital I/O standards such as LVCMOS and PCI Express signaling.

Does the MAXM17633AMG+T support prebias startup?

Yes, the MAXM17633AMG+T supports prebias startup, allowing safe turn-on when the output rail is already partially charged. This prevents reverse current flow and potential damage to downstream circuitry, making it suitable for hot-swap and redundant power architectures where the MAXM17633AMG+T may be inserted into an active system.

What is the maximum recommended PCB copper area for thermal relief under the MAXM17633AMG+T?

The MAXM17633AMG+T datasheet specifies θJA = 25°C/W on a four-layer board with natural convection. To achieve this, the exposed thermal pad must be soldered to a minimum 100 mm² (10mm × 10mm) internal or bottom-layer copper pour connected via ≥6 thermal vias (0.3mm diameter) to inner ground planes. Larger copper areas further improve thermal performance in the MAXM17633AMG+T.

Can the MAXM17633AMG+T synchronize to an external clock?

Yes, the MAXM17633AMG+T supports external clock synchronization via the MODE/SYNC pin. When driven with a TTL/CMOS-compatible square wave, the device locks its switching frequency to the external source within a capture range of ±40% of the internal R_RT-set frequency, enabling EMI reduction in noise-sensitive systems using the MAXM17633AMG+T.

Is the MAXM17633AMG+T compliant with CISPR22 Class B emissions standards?

Yes, the MAXM17633AMG+T complies with CISPR22 (EN55022) Class B conducted and radiated emissions requirements when used with the recommended external component values and PCB layout guidelines. No additional EMI filters or shielding are required to pass certification, simplifying system-level compliance testing for the MAXM17633AMG+T.