Monolithic Power Systems Inc. MPF42795DRT-0B-0000-P

Overview

MPF42795DRT-0B-0000-P from Monolithic Power Systems is a 2–10 series stacked-cell lithium-ion battery fuel gauge IC that estimates pack and individual cell state-of-charge (SOC) and state-of-health (SOH), remaining runtime, charge time, and instantaneous available power. It integrates five LED drivers for direct SOC level indication and communicates via 400 kHz I²C with CRC. Used in light EVs and cordless tools requiring precise, low-power battery telemetry.

For engineers reviewing the MPF42795DRT-0B-0000-P datasheet, MPF42795DRT-0B-0000-P pinout, MPF42795DRT-0B-0000-P application, or MPF42795DRT-0B-0000-P equivalent, key selection factors include ±3% SOC accuracy when paired with MP279x AFEs, 135 µA average operating current during rest, TQFN-32 (4 mm × 4 mm) package compatibility, and 5-level LED driver integration with push-button trigger.

Technical Context

The MPF42795DRT-0B-0000-P operates as a host-controlled fuel gauge co-processor, requiring periodic input of cell voltages (VRDG_CELL1–10), current, and temperature from an external analog front-end (e.g., MP279x). It executes adaptive learning algorithms to refine initial charge/discharge settings and track per-cell SOH degradation over lifetime.

Its I²C interface supports up to 400 kHz with optional 32-bit CRC for transaction integrity, and it features three operational modes: Active (fuel gauge update + I²C), Standby (idle, SDA-triggered wake), and Disabled (CE-low, 6 µA quiescent current while retaining NVM state).

Key Specifications

Pinout & Package

TQFN-32 (4 mm × 4 mm) package with exposed thermal pad (Pin 33) requiring soldered GND connection for thermal management and signal integrity.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar battery fuel gauge applications.

Compared with BQ34Z100-G1 and MAX17055, the MPF42795DRT-0B-0000-P uniquely integrates 5 LED drivers, IRQ signaling, and native 2–10S support in a thermally enhanced TQFN-32, making it optimal for industrial and light EV BMS where visual status, interrupt-driven host coordination, and wide cell count flexibility are required.

Availability

MPF42795DRT-0B-0000-P is available at Aetrix Electronics and suitable for light electric vehicles, energy storage systems, and cordless power tools requiring stable component supply, long-term lifecycle support, and RoHS-compliant manufacturing.

Supply support for MPF42795DRT-0B-0000-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 power management ICs, including DC/DC converters, battery monitors, and fuel gauges for industrial, automotive, and computing markets.

The MPF42795 belongs to MPS's battery fuel gauge product line, designed specifically to simplify BMS implementation for multi-cell lithium packs by combining high-accuracy SOC/SOH estimation, lifetime logging, and integrated LED indication in a single IC.

FAQ

What is the minimum system requirement to use MPF42795DRT-0B-0000-P?

The MPF42795 requires an external battery monitor (e.g., MP279x) providing individual cell voltages for 2–10 series cells, pack current, and temperature; plus an M0-class MCU with I²C, interrupt capability, 48 kB Flash, and 4 kB RAM to manage register writes, EXE_CMD triggers, and IRQ handling.

How does the MPF42795 achieve ±3% SOC accuracy?

This accuracy is validated when paired with MPS MP279x AFEs under defined conditions: 10°C–50°C ambient, ≤1C charge/discharge rates, and proper configuration of cell model parameters. It relies on adaptive learning and high-fidelity voltage/current inputs-not standalone operation.

Can the LED indicators be controlled manually instead of automatically?

Yes. By setting the LEDS_ON_MAN register, the host MCU gains direct control over each LEDx_ON bit, allowing custom SOC mapping or status coding independent of the fuel gauge's internal SOC calculation-useful for multi-state diagnostics or branding.

What happens to stored data when the CE pin is pulled low?

In Disabled mode (CE = low), the MPF42795 retains all internal state variables-including SOC, SOH, and lifetime logs-in non-volatile memory. No data is lost, and the device resumes operation with full context upon CE release.

Is the I²C address fixed or configurable?

The default I²C slave address is 0x08, but it is fully configurable via the CONFIG_MODE_CMD sequence. The new address is saved to NVM and persists after power cycling or nRST assertion, enabling flexible multi-device bus topologies.

Does the MPF42795 support battery chemistries other than lithium-ion?

No-the device is optimized exclusively for lithium-based chemistries (LiCoO₂, NMC, LiFePO₄, etc.). Its fuel gauge algorithms, cell models, and voltage ranges assume lithium cell characteristics; use outside this scope yields unvalidated accuracy.

How is thermal performance managed in the TQFN-32 package?

The exposed thermal pad (Pin 33) must be soldered to a large GND copper pour. With θJA = 47°C/W on a 4-layer PCB, the device sustains continuous operation at TJ ≤ 85°C under typical 135 µA operating current, even in enclosed enclosures up to 65°C ambient.