Analog Devices Inc./Maxim Integrated MAX77839CEFQ+

Overview

MAX77839CEFQ+ from Analog Devices is a high-efficiency, 3.6A switching current buck-boost DC-DC regulator optimized for single-cell Li-ion and low-voltage battery chemistries (≥1.8V discharge). It delivers 2.3V–5.3V output via single-resistor programming, operates from 1.8V–5.5V input, achieves 96% peak efficiency at 3.6V_IN/3.3V_OUT, and features ultra-low 6μA quiescent current-enabling extended runtime in asset tracking and smartphone ToF sensors.

For engineers reviewing the MAX77839CEFQ+ datasheet, MAX77839CEFQ+ pinout, MAX77839CEFQ+ application, or MAX77839CEFQ+ equivalent, this page provides verified package mapping (11-lead FC2QFN), confirmed GPIO function (POK open-drain output), validated switching current limit (3.6A typ), thermal shutdown threshold (+150°C), and real-world use context for cellular RF power and system pre-regulation.

Technical Context

The MAX77839CEFQ+ implements a four-switch H-bridge buck-boost topology with fixed 2.2MHz PWM control and current-mode compensation. It seamlessly transitions between buck (V_IN > V_OUT) and boost (V_IN < V_OUT) modes using Phase 1–4 switching sequences, enabling stable regulation across full input range without mode discontinuities.

Its control architecture integrates cycle-by-cycle inductor peak current limiting (3.6A typ), active output discharge (100Ω internal switch), and dual-mode GPIO: configured as POK open-drain output (per ordering code 'D'), asserting low when V_OUT is within ±10% of target-critical for sequenced power-up in multi-rail systems.

Key Specifications

Pinout & Package

MAX77839CEFQ+ uses the 2.5mm × 2.0mm, 0.5mm pitch, 11-lead FC2QFN package (package code F112A2F+1), with exposed thermal pad connected to PGND for enhanced thermal performance (θ_JA = 52.3°C/W on 4-layer board).

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX77839BEFQ+T, MAX77839CEFQ+ shares identical functionality but differs in packaging format; versus TPS63802DLAR, MAX77839CEFQ+ delivers lower IQ, integrated POK, and active discharge-making it preferable for battery longevity and system-level power management in compact portable devices.

Availability

MAX77839CEFQ+ is available at Aetrix Electronics and suitable for asset tracking, cellular RF power, and smartphone ToF sensor applications requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.

Supply support for MAX77839CEFQ+ 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

Analog Devices (acquired Maxim Integrated in 2021) is a global leader in high-performance analog, mixed-signal, and power management semiconductors, serving industrial, automotive, communications, and consumer markets.

The MAX77839 belongs to Maxim's ultra-low-power PMIC family, designed specifically for battery-operated portable electronics where extended runtime, small solution size, and robust protection are mandatory-targeting smartphones, wearables, and IoT edge devices.

FAQ

What is the GPIO function of MAX77839CEFQ+?

The MAX77839CEFQ+ configures its GPIO pin as a POK (power-ok) open-drain output per its ordering code 'D'. When enabled, it pulls low when the regulated output voltage is within ±10% of the target value set by the RSEL resistor. This signal is used for system power sequencing and must be pulled up externally with a 15kΩ resistor to V_IO. The MAX77839CEFQ+ does not support FPWM input mode.

What is the switching current limit for MAX77839CEFQ+?

The MAX77839CEFQ+ has a typical switching current limit of 3.6A, corresponding to the 'C' and 'D' ILIM option group. This value defines the peak inductor current during normal operation and is validated in the Electrical Characteristics table (ILIM = 3.24A min / 3.6A typ / 3.96A max at +25°C). It determines minimum inductor saturation rating and affects thermal design margin.

Which package does MAX77839CEFQ+ use?

MAX77839CEFQ+ uses the 11-lead FC2QFN package (outline number 21-100431, package code F112A2F+1), measuring 2.5mm × 2.0mm with 0.5mm pitch and an exposed thermal pad. This package provides lower thermal resistance (θ_JA = 52.3°C/W) than the WLP variant and is compatible with standard QFN reflow profiles and automated optical inspection.

Does MAX77839CEFQ+ support active output discharge?

Yes, MAX77839CEFQ+ includes integrated active output discharge via a 100Ω internal switch between OUT and PGND. This feature automatically engages when the device is disabled (EN low) or latched off by protection circuits (e.g., thermal shutdown), rapidly discharging the output capacitor to prevent residual voltage holdup that could interfere with downstream logic or cause safety hazards.

How is the output voltage set on MAX77839CEFQ+?

The output voltage of MAX77839CEFQ+ is set by connecting a precision resistor (RSEL) between the SEL pin and AGND. The IC reads this resistance during startup (t_RSEL ≈ 450μs) to determine the target V_OUT. For example, a 40.2kΩ resistor yields 3.6V output. Table 1 in the datasheet lists exact RSEL values for 2.3V–5.3V; 1% tolerance resistors are required for ±1% output accuracy.