Analog Devices Inc./Maxim Integrated MAX77932CEWO+T

Overview

MAX77932CEWO+T from Maxim Integrated is a standalone, dual-phase switched-capacitor DC-DC converter delivering 8A output current with 2S-to-1S voltage conversion (V_OUT = V_IN/2), integrated power switches, and I²C programmability. It operates from 4.9V to 11V input, achieves 98.5% peak efficiency, and targets space-constrained 2S Li⁺ battery systems requiring 1S-equivalent rail generation.

For engineers reviewing the MAX77932CEWO+T datasheet, MAX77932CEWO+T pinout, MAX77932CEWO+T application, or MAX77932CEWO+T equivalent, key selection considerations include its inductorless topology, programmable OCP/UVLO/OVLO thresholds, 0.25–1.5MHz switching frequency range, thermal alarm at +100°C/+120°C, and 42-bump WLP package for ultra-dense portable power designs.

Technical Context

The MAX77932CEWO+T implements an interleaved dual-phase switched-capacitor architecture with fixed 50% duty cycle per phase, reducing output ripple and enabling high-current delivery without inductors. Its charge-pump-based topology uses eight internal NMOS switches (RDSON 11–13mΩ) and two flying capacitor banks (CF1P/CF1N, CF2P/CF2N) to achieve precise VIN/2 regulation.

Control is fully digital via I²C interface supporting up to 3.4MHz clock rate, with register-accessible configuration of soft-start current (145–580mA), switching frequency, OCP threshold (4.2–11.6A), and dithering (OFF/3%/6%/12%). Protection includes overvoltage lockout (9.5–11.0V), undervoltage lockout (4.1V default), thermal shutdown, and active discharge on OUT.

Key Specifications

Pinout & Package

MAX77932CEWO+T is housed in a lead-free wafer-level package (WLP) with 42 bumps arranged in a 6×7 grid (2.4mm × 2.8mm footprint, 0.4mm pitch). The package supports fine-pitch routing and minimal board area usage.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar switched-capacitor converter applications.

Compared with TPS65988DHAR and LT8210EUFD#PBF, the MAX77932CEWO+T uniquely combines 8A 2S-to-1S conversion, full I²C configurability, dual thermal alarms, and WLP packaging-making it the only option meeting strict size, efficiency, and programmability requirements for next-gen portable electronics.

Availability

MAX77932CEWO+T is available at Aetrix Electronics and suitable for smartphones, ultrabooks, and DSLR cameras requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.

Supply support for MAX77932CEWO+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 power management, sensing, and communications in demanding environments.

The MAX77932CEWO+T belongs to Maxim's advanced power conversion portfolio targeting ultra-dense, high-efficiency battery-powered systems-specifically engineered to simplify 2S Li⁺ adoption in consumer and prosumer portable devices.

FAQ

What is the maximum input voltage supported by the MAX77932CEWO+T?

The MAX77932CEWO+T supports an absolute maximum input voltage of +16V on the IN pin, but its operational input range is 4.9V to 11V due to programmable input overvoltage lockout (IOVP) thresholds of 9.5V, 10.0V, 10.5V, or 11.0V. Exceeding 11V triggers IOVP shutdown, protecting downstream circuitry. This range aligns precisely with 2S Li⁺ battery voltages (6.0–8.4V nominal, up to 8.7V fully charged).

How does the MAX77932CEWO+T achieve 98.5% peak efficiency?

The MAX77932CEWO+T achieves 98.5% peak efficiency through its dual-phase interleaved switched-capacitor architecture, ultra-low RDSON NMOS switches (11–13mΩ), minimized parasitic losses via WLP packaging, and optimized charge transfer timing. At VIN = 7.4V and 0.25MHz switching frequency, conduction and switching losses are balanced to maximize energy transfer-verified across production units per Maxim's Electrical Characteristics table.

Can the MAX77932CEWO+T be used without an I²C host controller?

Yes, the MAX77932CEWO+T can operate without I²C configuration: default settings include 8.8A OCP, 4.1V UVLO, 5.0V OVP, 0.5MHz switching frequency, and 3% frequency dithering. EN pin control enables basic on/off functionality. However, I²C is required to adjust soft-start current, change OCP/UVLO thresholds, or enable thermal alarm reporting via IRQB.

What are the recommended flying capacitor values for the MAX77932CEWO+T?

Maxim specifies 2×47μF X7R ceramic capacitors per phase (CF1P–CF1N and CF2P–CF2N), rated ≥16V, with low ESR (<5mΩ) and low ESL. These values are validated in the Electrical Characteristics table and Typical Application Circuits to ensure stable 8A operation, minimal ripple, and thermal performance across temperature. Smaller values degrade efficiency and increase ripple; larger values yield diminishing returns and higher cost.

Does the MAX77932CEWO+T provide output active discharge?

Yes, the MAX77932CEWO+T includes programmable output active discharge via an internal 1k–1.5kΩ pull-down resistor between OUT and PGND, activated during shutdown. This feature ensures rapid VOUT discharge to safe levels (<0.5V) within milliseconds, preventing residual voltage from interfering with system reset sequencing or causing latch-up in downstream ICs.