Analog Devices Inc./Maxim Integrated MAX77827BEWC+T

Overview

MAX77827BEWC+T from Maxim Integrated is a high-efficiency, ultra-low-quiescent-current buck-boost DC/DC converter optimized for single-cell Li-ion battery systems. It delivers 2.3V–5.3V adjustable output from 1.8V–5.5V input, supports 1.8A switching current limit (1.0A buck / 900mA boost at 3.0V_IN/3.3V_OUT), achieves 96% peak efficiency, and operates with only 6μA typical I_Q. It is used in space-constrained wearable and IoT power rails.

For engineers reviewing the MAX77827BEWC+T datasheet, MAX77827BEWC+T pinout, MAX77827BEWC+T application, or MAX77827BEWC+T equivalent, key selection factors include its 1.8A ILIM option, WLP-12 package (1.61mm × 2.01mm), SKIP/PWM mode control via FPWM pin, POK indicator functionality, and seamless buck-boost transition without external mode switching.

Technical Context

The MAX77827BEWC+T implements a four-switch H-bridge buck-boost topology with fixed 2.5MHz PWM control and current-mode compensation. It uses phase-based switching (Φ1–Φ3) to dynamically allocate energy storage and transfer-enabling continuous regulation across VIN < VOUT (boost), VIN ≈ VOUT (buck-boost boundary), and VIN > VOUT (buck) conditions without discontinuity.

Its control architecture integrates soft-start (1.5ms typ for B/D options), active output discharge (100Ω internal switch), and dual-level overcurrent protection (1.8A ILIM with 3ms fault timeout). The SEL pin sets output voltage via single resistor (RSEL), while FPWM forces continuous PWM operation to minimize ripple, and POK provides open-drain power-good monitoring at 92.5%/90% V_OUT thresholds.

Key Specifications

Pinout & Package

MAX77827BEWC+T is packaged in a 1.61mm × 2.01mm, 12-bump wafer-level package (WLP) with 0.4mm pitch. This ultra-compact, bottom-terminal package minimizes PCB area and thermal resistance (θ_JA = 72.8°C/W on 4-layer board), ideal for thin-profile portable devices.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar buck-boost regulator applications.

Compared with TPS63802DLCT and NCP1462MUTBG, MAX77827BEWC+T offers the industry's lowest quiescent current (6μA), integrated POK and FPWM control, and resistor-programmable output-all in the smallest WLP footprint, making it optimal for ultra-long-life, feature-rich portable systems.

Availability

MAX77827BEWC+T is available at Aetrix Electronics and suitable for wearable health monitors, LPWAN cellular modules, and compact industrial sensor nodes requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.

Supply support for MAX77827BEWC+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 leader specializing in high-performance analog, mixed-signal, and power management solutions for demanding applications.

The MAX77827 family was designed specifically for ultra-low-power, space-constrained battery-powered devices-delivering best-in-class efficiency, quiescent current, and integration for next-generation wearables, IoT endpoints, and portable medical electronics.

FAQ

What is the switching current limit of the MAX77827BEWC+T?

The MAX77827BEWC+T has a nominal switching current limit of 1.8A, as confirmed in Table 1 of the datasheet for B/D-option parts. This defines the peak inductor current during operation and directly determines maximum achievable load current-1.0A in buck mode and 900mA in boost mode at 3.0V_IN/3.3V_OUT. The MAX77827BEWC+T uses this lower ILIM option to optimize external component sizing for moderate-load applications.

Does the MAX77827BEWC+T support adjustable output voltage?

Yes, the MAX77827BEWC+T supports fully adjustable output voltage from 2.3V to 5.3V using a single external resistor connected to the SEL pin. Table 2 in the datasheet provides precise RSEL values (e.g., 909kΩ for 2.3V, open for 3.3V, short to GND for 3.3V) with 1% tolerance recommended. This resistor-based configuration eliminates the need for external DACs or digital interfaces, simplifying design for the MAX77827BEWC+T.

What package type is used by the MAX77827BEWC+T?

The MAX77827BEWC+T uses a 12-bump wafer-level package (WLP) measuring 1.61mm × 2.01mm with 0.4mm pitch, designated as package code W121H2+1. This ultra-compact, bottom-terminal package is optimized for minimal PCB area and low thermal resistance (72.8°C/W), making it ideal for thin-profile portable devices where space and thermal performance are critical constraints for the MAX77827BEWC+T.

How does the POK pin function on the MAX77827BEWC+T?

The POK (Power-OK) pin on the MAX77827BEWC+T is an open-drain output that signals valid regulation: it pulls high (via external pull-up) when V_OUT reaches ≥92.5% of the target voltage and pulls low when V_OUT drops ≤90% of target. This provides system-level power sequencing and fault detection without additional supervision circuitry-ensuring reliable startup and brownout response for the MAX77827BEWC+T in battery-powered applications.

What protection features are integrated into the MAX77827BEWC+T?

The MAX77827BEWC+T integrates UVLO (1.75V rising threshold), soft-start (1.5ms for B/D options), active output discharge (100Ω internal switch), cycle-by-cycle overcurrent protection (1.8A trip with 3ms timeout), and thermal shutdown (165°C). These features eliminate the need for external protection components and ensure robust operation across battery discharge, load transients, and fault conditions-enhancing system reliability for the MAX77827BEWC+T in unattended deployments.