Analog Devices Inc./Maxim Integrated MAX77827AEFD+

Overview

MAX77827AEFD+ from Maxim Integrated is a high-efficiency, 2.5MHz buck-boost DC/DC converter optimized for single-cell Li-ion battery systems. It delivers up to 1.0A in buck mode and 900mA in boost mode (VIN = 3.0V, VOUT = 3.3V), features 6μA typical quiescent current, 96% peak efficiency, and supports 2.3V–5.3V output via single-resistor programming - ideal for space-constrained wearables and LPWAN modules.

For engineers reviewing the MAX77827AEFD+ datasheet, MAX77827AEFD+ pinout, MAX77827AEFD+ application, or MAX77827AEFD+ equivalent, this page provides verified package mapping (14-pin FC2QFN), confirmed switching current limit (3.1A), validated GPIO functions (FPWM/POK), thermal shutdown threshold (+165°C), and real-world transient response data (250mV load step).

Technical Context

The MAX77827AEFD+ implements a four-switch H-bridge topology with fixed-frequency (2.25–2.75MHz) current-mode PWM control, enabling seamless buck/boost transitions without external mode selection. Its dual ILIM options (1.8A/3.1A) are hard-coded per variant - the "A" suffix denotes the 3.1A switching current limit, confirmed in Table 1 of the datasheet.

It integrates analog functions including SEL-based output voltage configuration (RSEL programmable from 2.3V to 5.3V), active-output discharge (100Ω internal switch), and precision POK monitoring (±2.5% window around VOUT). Protection includes UVLO (1.75V rising threshold), soft-start (200µs for A/C options), and cycle-by-cycle OCP with 3ms fault detection and 12ms retry interval.

Key Specifications

Pinout & Package

The MAX77827AEFD+ is packaged in a 2.5mm × 2.5mm, 14-lead FC2QFN (package code F142A2F+1) with exposed thermal pad. This RoHS-compliant package offers θJA = 63.4°C/W on a 4-layer board and supports reflow soldering at +260°C.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TPS63020DSJR and RTQ2134B-GE, the MAX77827AEFD+ uniquely combines 3.1A switching current, resistor-programmable VOUT, FPWM/POK GPIOs, and 6μA IQ - making it optimal for next-gen wearables and LPWAN devices where size, efficiency, and feature integration are critical.

Availability

MAX77827AEFD+ is available at Aetrix Electronics and suitable for smart wearables, LPWAN modems, and smartphone peripherals requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.

Supply support for MAX77827AEFD+ 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 consumer applications.

The MAX77827 product line targets ultra-low-power, space-constrained battery-operated systems - delivering high-efficiency buck-boost conversion with integrated protection and programmability for wearables, IoT endpoints, and portable medical devices.

FAQ

What is the switching current limit of the MAX77827AEFD+?

The MAX77827AEFD+ has a confirmed switching current limit of 3.1A (typical) as specified in Table 1 of the datasheet for "A" and "C" variants. This value is factory-trimmed and applies across the full operating temperature range (-40°C to +125°C). The 3.1A ILIM enables higher output current capability in buck mode and robust short-circuit protection - distinct from the 1.8A option used in "B" and "D" variants like MAX77827BEFD+.

Does the MAX77827AEFD+ support adjustable output voltage?

Yes, the MAX77827AEFD+ supports resistor-programmable output voltage from 2.3V to 5.3V using the SEL pin and an external RSEL resistor. Table 2 in the datasheet lists exact RSEL values (e.g., 95.3kΩ for 3.1V, open for 3.3V). This eliminates the need for external DACs or I²C interfaces, simplifying BOM and layout while maintaining ±1% accuracy with 1% tolerance resistors.

What package type is used for the MAX77827AEFD+?

The MAX77827AEFD+ uses the 14-lead FC2QFN package (2.5mm × 2.5mm × 0.55mm height, package code F142A2F+1) with exposed thermal pad. This differs from the 12-bump WLP option (e.g., MAX77827AEWC+T). The FC2QFN offers superior thermal performance (θJA = 63.4°C/W) and is compatible with standard QFN assembly processes - confirmed in the "Package Information" section of the datasheet.

How does the POK pin function on the MAX77827AEFD+?

The POK pin on the MAX77827AEFD+ is an open-drain output that signals valid regulation: it pulls high (via external pull-up) when VOUT reaches ≥92.5% of the target voltage, and pulls low when VOUT falls below 90% of target. This provides precise power-good monitoring for system sequencers and microcontrollers - unlike simpler enable-status indicators, POK reflects actual output voltage accuracy and stability.

What protection features are integrated into the MAX77827AEFD+?

The MAX77827AEFD+ integrates UVLO (1.75V rising threshold), soft-start (200µs for A/C variants), active output discharge (100Ω internal switch), cycle-by-cycle overcurrent protection (3ms fault detection), and thermal shutdown (+165°C). These features eliminate the need for discrete protection components, reduce BOM count, and ensure reliable operation across battery voltage sag, load transients, and thermal overload conditions.