Analog Devices Inc./Maxim Integrated MAX15040EWE+T

Overview

MAX15040EWE+T from Maxim Integrated is a high-efficiency, voltage-mode synchronous step-down DC-DC regulator with integrated 15mΩ high-side and low-side nMOS switches, delivering up to 4A continuous output current at adjustable voltages from 0.6V to 0.9×VIN, operating from 2.4V–3.6V input, and achieving ±1% output-voltage accuracy over load, line, and temperature - ideal for DDR, ASIC core, and point-of-load power in telecom and server applications.

For engineers reviewing the MAX15040EWE+T datasheet, MAX15040EWE+T pinout, MAX15040EWE+T application, or MAX15040EWE+T equivalent, this page delivers verified technical context, validated pin functions, confirmed 2mm×2mm WLP package mapping, real-world transient response specs, and two rigorously cross-checked alternative regulators with documented functional and application-level differences.

Technical Context

The MAX15040EWE+T employs voltage-mode control architecture with a >15MHz bandwidth error amplifier and factory-trimmed 1MHz fixed-frequency PWM operation, enabling Type III compensation for loop bandwidth up to 200kHz. Its high-bandwidth control loop ensures fast load-transient response and supports all-ceramic capacitor designs.

It integrates dual on-chip nMOS switches (15mΩ R_DS(ON) high-side, 15mΩ low-side), hiccup-mode overload protection, programmable soft-start via REFIN/SS capacitor, and safe startup into prebiased outputs - all within a thermally optimized 2mm×2mm, 16-bump WLP package with 0.5mm pitch.

Key Specifications

Pinout & Package

MAX15040EWE+T is housed in a 2mm × 2mm, 16-bump wafer-level package (WLP) with 0.5mm pitch arranged in a 4×4 array. All bumps are soldered directly to PCB pads; no leads or wire bonds. Thermal performance relies on GND bump thermal vias and proper copper pour under the device.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TPS544B20RTWR and ISL85415IRZ-T7A, the MAX15040EWE+T offers superior thermal density (2mm² vs. ≥10mm²), guaranteed hiccup-mode protection for short-circuit survival, and native REFIN/SS-based tracking - making it uniquely suited for space-constrained, high-reliability DDR and ASIC core supplies.

Availability

MAX15040EWE+T is available at Aetrix Electronics and suitable for server power supplies, telecom base-station I/O rails, and DDR memory power delivery requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.

Supply support for MAX15040EWE+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) is a semiconductor company specializing in high-performance analog, mixed-signal, and power management ICs for demanding industrial, communications, and computing applications.

The MAX15040EWE+T belongs to Maxim's high-efficiency, ultra-compact DC-DC regulator product line, designed specifically for point-of-load power delivery in space- and thermal-constrained systems such as servers, 5G infrastructure, and high-speed memory interfaces.

FAQ

What is the maximum continuous output current of the MAX15040EWE+T?

The MAX15040EWE+T delivers up to 4A continuous output current under specified thermal conditions (TA ≤ +70°C with adequate PCB copper). At full load and VIN = 3.3V, it maintains >93% efficiency and operates safely up to +105°C junction temperature. Derating applies above +70°C ambient per its 12.5mW/°C thermal resistance specification. The MAX15040EWE+T datasheet confirms RMS LX current rating of 4A and peak current limit of 7A.

Does the MAX15040EWE+T support startup into a prebiased output?

Yes, the MAX15040EWE+T supports safe startup into a prebiased output - a key feature for DDR and multi-rail systems. Its control architecture prevents reverse current flow during turn-on, even with 2A prebias load, as verified in Figure toc16/toc17 of the official datasheet. This behavior is enabled by internal circuitry that monitors LX and FB during enable assertion, ensuring the low-side FET remains off until regulation begins. The MAX15040EWE+T implements this without external components.

What package type and dimensions does the MAX15040EWE+T use?

The MAX15040EWE+T uses a 2mm × 2mm, 16-bump wafer-level package (WLP) with 0.5mm pitch arranged in a 4×4 array. It is lead(Pb)-free and RoHS-compliant (denoted by the '+' suffix). This package has no leads or exposed thermal pad - all electrical and thermal connections are made through solder bumps. The MAX15040EWE+T thermal performance is characterized with 6 thermal vias under GND bumps and 1oz copper on inner layers.

Can the MAX15040EWE+T be used with all-ceramic output capacitors?

Yes, the MAX15040EWE+T is fully compatible with all-ceramic output capacitor designs. Its 1MHz switching frequency, high-bandwidth (>15MHz) error amplifier, and voltage-mode control architecture allow stable operation with low-ESR/low-ESL ceramic capacitors - eliminating the need for bulk electrolytics. Typical designs use 22µF X5R ceramics, achieving <15mV_pp ripple at 4A load. The MAX15040EWE+T evaluation kit (MAX15040EVKIT) validates this configuration in Figure 1.

What protection features are built into the MAX15040EWE+T?

The MAX15040EWE+T integrates hiccup-mode overload protection, thermal shutdown (+165°C trip, 20°C hysteresis), VDD undervoltage lockout (1.75V–2.2V), peak current limiting on both high-side and low-side MOSFETs, and safe prebias startup. During output short-circuit, it enters hiccup mode after 36µs of FB <70% VREFIN/SS, disabling switching for 896 clock cycles before retry. These protections are fully documented in the Electrical Characteristics and Detailed Description sections of the MAX15040EWE+T datasheet.