Monolithic Power Systems Inc. MP2639BGR-P

Overview

MP2639BGR-P from Monolithic Power Systems is a bidirectional switch-mode battery management IC for single-cell Li-ion/Li-polymer systems, operating in charge (buck), discharge (boost), and sleep modes. It supports 4.5V–16V input range, delivers up to 4.35V ±0.5% regulated charge voltage, 4A programmable charge current, 3A boost output current, and integrates NTC-based JEITA-compliant temperature monitoring with thermal regulation at 120°C. Used in USB PD power banks requiring automatic recharge and fuel-gauge LED indication.

For engineers reviewing the MP2639BGR-P datasheet, MP2639BGR-P pinout, MP2639BGR-P application, or MP2639BGR-P equivalent, key selection considerations include its dual-mode operation (charge/discharge), programmable input-current-based power management, integrated 4mm×4mm QFN-26 package with exposed thermal pad, and support for USB PD-compatible output voltage levels via FB feedback control.

Technical Context

The MP2639BGR-P implements a synchronous buck topology in charge mode (Q1 high-side, Q2 low-side) and synchronous boost topology in discharge mode (Q2 active switch, Q1 synchronous rectifier), with internal MOSFETs having R_ON of 17mΩ (Q1), 25mΩ (Q2), and 12mΩ (reverse-blocking FET). Its adaptive control loop uses voltage- and current-mode feedback with 1.2V internal reference for both charge termination (VBATT_REG) and boost output regulation (VIN_DSCHG_REF).

Operation is governed by MODE pin logic level and push-button (P-----B-----) state, enabling latchable discharge activation and LED-based fuel gauge indication. Safety functions include input over-voltage lockout (19.5V), battery over-voltage protection (4.60V), thermal shutdown (155°C), and JEITA-compliant NTC thresholds (VCOLD/VCOOL/VWARM/VHOT) mapped to percentage of VVNTC.

Key Specifications

Pinout & Package

MP2639BGR-P is housed in a thermally enhanced 4mm × 4mm QFN-26 package with exposed PGND pad for optimal heat dissipation and EMI control. Pin 5 (PGND) and the exposed pad must be connected to the same ground plane.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar bidirectional battery management applications.

Compared with BQ25895RTWR and IP2326, MP2639BGR-P uniquely integrates bidirectional power conversion, JEITA-compliant thermal management, and 4.35V precision charging-enabling compact, standards-compliant USB PD power banks without external FETs or secondary controllers.

Availability

MP2639BGR-P is available at Aetrix Electronics and suitable for USB PD power banks, portable power stations, mobile internet devices, and emergency backup power systems requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.

Supply support for MP2639BGR-P 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

Monolithic Power Systems (MPS) is a fabless semiconductor company specializing in high-performance analog and power ICs, with design centers in the US, China, and Taiwan, and global distribution through authorized partners.

The MP2639B product line targets portable energy storage systems requiring integrated, bidirectional battery management-designed specifically to replace multi-IC solutions in USB PD power banks and compact power stations.

FAQ

What is the function of the P-----B----- pin?

The P-----B----- pin is a push-button interface with internal pull-up. A short press (<2.5s) enables latched discharge mode when MODE is high; a long press (>2.5s) disables it. During discharge, LED1–LED4 illuminate for 5 seconds to indicate status. The pin requires no external pull-up and interfaces directly to mechanical buttons grounded to AGND.

How does the MP2639BGR-P implement JEITA-compliant battery temperature protection?

It uses the NTC pin (Pin 20) with VNTC bias (Pin 19) to monitor a resistive NTC thermistor divider. Four voltage thresholds (VCOLD, VCOOL, VWARM, VHOT) are compared against percentages of VVNTC (69.4–49.5%) to suspend charging in cold/hot conditions per JEITA standards. Hysteresis (0.8–1.55%) prevents oscillation near trip points.

Can the MP2639BGR-P operate without an external microcontroller?

Yes. It operates autonomously using MODE pin logic level and P-----B----- button input. All charge phases (pre-charge, CC, CV), auto-recharge, thermal regulation, LED fuel gauge, and safety timers are fully hardware-controlled with no firmware required. External resistors program current/voltage limits and timing.

What is the purpose of the VLIM pin?

The VLIM pin (Pin 18) sets input current limit during charge mode by connecting an external resistor to AGND. It enables input-current-based power management-critical for USB PD sources that enforce strict current caps. Supported range: 400mA to 3A, with typical values at RILIM = 475kΩ (500mA), 154kΩ (1.5A), and 73.2kΩ (3A).

Does the MP2639BGR-P support USB PD communication?

No. It does not include USB PD protocol stack or BMC transceiver. However, it supports USB PD *voltage levels* in discharge mode via FB pin control-when paired with a dedicated PD controller (e.g., CYPD3177), it delivers regulated 5V/9V/12V/15V outputs compliant with USB PD specifications.

How is thermal regulation implemented?

Thermal regulation activates at 120°C junction temperature, dynamically reducing charge current to maintain die temperature below this threshold. If temperature rises further, thermal shutdown triggers at 155°C with 18°C hysteresis. The exposed QFN pad and PGND connection are essential for effective heat transfer to the PCB.

What is the role of the ACOK and CHGOK pins?

ACOK (Pin 25) is an open-drain indicator pulled LOW when valid input voltage is detected (VIN > VIN_UVLO). CHGOK (Pin 26) is also open-drain: logic LOW during active charging; becomes open-drain upon completion or suspension. Both require external pull-up resistors and drive status LEDs or microcontroller interrupts.