Texas Instruments BQ29707DSER

Overview

BQ29707DSER from Texas Instruments is a single-cell Li-ion/Li-polymer battery protection IC that integrates overvoltage (4.280 V), undervoltage (2.800 V), charge/discharge overcurrent (–0.090 V / 0.090 V), and short-circuit (0.3 V) detection with factory-programmed thresholds and fixed timing delays. It drives external CHG/DSG FETs via dedicated COUT/DOUT outputs and supports zero-voltage charging for deeply depleted cells in portable power systems.

For engineers reviewing the BQ29707DSER datasheet, BQ29707DSER pinout, BQ29707DSER application, or BQ29707DSER equivalent, this device delivers verified ±5 mV OCP sensing accuracy, 4 µA NORMAL-mode quiescent current, and WSON-6 (1.50 mm × 1.50 mm) packaging optimized for space-constrained battery packs in mobile handsets and handheld data terminals.

Technical Context

The BQ29707DSER implements analog voltage and current fault monitoring using differential sensing across external FETs (V– to VSS), with independent comparators for OVP, UVP, OCC, OCD, and SCP. Its internal oscillator governs all fault timers-including 1 s OVP delay, 96 ms UVP delay, 6 ms OCC delay, 16 ms OCD delay, and 250 µs SCP delay-without requiring external components.

Operation is fully autonomous: no host MCU interface is needed. The device transitions between NORMAL mode (4 µA ICC) and shutdown (100 nA IQ) based on pack voltage conditions, and enables zero-voltage charging when BAT ≥ 1.7 V while inhibiting it below 0.75 V, ensuring safe recovery of exhausted cells.

Key Specifications

Pinout & Package

Package: WSON-6 (DSE), 1.50 mm × 1.50 mm × 0.75 mm body size, wettable flank, exposed thermal pad.

Key Features

Applications

Equivalent & Alternatives

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

Compared with BQ29707DSER, BQ29702DSER offers higher OVP headroom and stronger OCD immunity, while BQ29733DSER provides faster UVP reaction and tighter OVP control-both retain identical pinout, package, and functional architecture but differ in factory-trimmed thresholds and timers.

Availability

BQ29707DSER is available at Aetrix Electronics and suitable for mobile handsets, handheld data terminals, and tablet PCs requiring stable component supply, long-lifecycle support, and guaranteed traceable sourcing for production programs.

Supply support for BQ29707DSER 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

Texas Instruments is a global semiconductor leader specializing in analog, embedded processing, and power management technologies, with decades of experience in battery safety ICs.

The BQ297xx family was designed specifically for cost-sensitive, space-constrained single-cell Li-ion/Li-polymer battery packs in consumer electronics-delivering full hardware protection with zero software dependency and minimal external components.

FAQ

What protection functions does the BQ29707DSER provide?

The BQ29707DSER provides five core hardware-based protections: overcharge detection (4.280 V), over-discharge detection (2.800 V), charge overcurrent detection (–0.090 V), discharge overcurrent detection (0.090 V), and load short-circuit detection (0.3 V). All thresholds and associated timing delays-including 1 s OVP delay, 96 ms UVP delay, 6 ms OCC delay, 16 ms OCD delay, and 250 µs SCP delay-are factory-programmed and fixed. The BQ29707DSER executes these protections autonomously without MCU interaction.

How does the BQ29707DSER support zero-voltage charging?

The BQ29707DSER enables zero-voltage charging when the battery voltage is 0 V by allowing the CHG FET to turn on if the charger supplies ≥1.7 V at the BAT pin. Charging is inhibited if the battery voltage drops below 0.75 V, preventing unsafe activation of damaged cells. This behavior is implemented entirely in hardware and requires no external configuration-BQ29707DSER manages the transition automatically upon detecting valid charger presence and sufficient voltage margin.

What is the package type and pin compatibility of BQ29707DSER?

The BQ29707DSER uses a 6-pin WSON (DSE) package measuring 1.50 mm × 1.50 mm × 0.75 mm with wettable flanks and an exposed thermal pad. It shares identical pinout, footprint, and electrical characteristics with all members of the BQ297xx family-including BQ29702DSER and BQ29733DSER-enabling direct substitution within the same PCB layout when factory-programmed thresholds align with system requirements.

Does the BQ29707DSER require external components for basic operation?

No, the BQ29707DSER operates autonomously with zero external passive components required for core protection functionality. Only two external FETs (CHG and DSG) and their gate resistors (5 MΩ recommended) are needed. A 0.1 µF bypass capacitor on BAT and a 2.2 kΩ resistor between V– and PACK– are recommended for noise filtering and proper SCD biasing-but neither is mandatory for fundamental fault detection and response. The BQ29707DSER contains all necessary references, comparators, timers, and drivers internally.

What are the key electrical specifications of BQ29707DSER in NORMAL mode?

In NORMAL mode, the BQ29707DSER draws just 4 µA typical current at 3.8 V BAT and 25°C-enabling multi-year battery shelf life. Its COUT and DOUT outputs deliver VOH ≥3.4 V and VOL ≤0.5 V into 30 µA loads, ensuring robust drive capability for standard logic-level NMOS FETs. Input voltage range spans –0.3 V to 8 V on BAT and supports differential sensing up to ±25 V between BAT and V–, accommodating wide-ranging pack configurations and charger transients.