Texas Instruments BQ29702DSET

Overview

BQ29702DSET from Texas Instruments is a single-cell Li-ion/Li-polymer battery protection IC that integrates overvoltage (4.350 V), undervoltage (2.800 V), charge/discharge overcurrent (–0.155 V / 0.160 V), and short-circuit (0.3 V) detection with factory-programmed thresholds and fixed timing delays (1 s OVP, 96 ms UVP, 16 ms OCD, 8 ms OCC, 250 µs SCP). It operates in NORMAL mode at 4 µA and supports zero-voltage charging for depleted cells down to 1.7 V, targeting compact portable power systems.

For engineers reviewing the BQ29702DSET datasheet, BQ29702DSET pinout, BQ29702DSET application, or BQ29702DSET equivalent, key selection criteria include its 6-pin WSON (1.50 mm × 1.50 mm) package, ±5 mV typical OCP sensing accuracy across external FETs, dual gate-drive outputs (COUT/DSG), and factory-configured fault recovery timers (12 ms OVP, 8 ms UVP/OCC/OCD).

Technical Context

The BQ29702DSET implements analog voltage and current monitoring using differential sensing at V– and VSS to detect overcharge, over-discharge, and load faults without requiring external ADCs or microcontrollers. Its internal comparators compare sensed voltages against factory-trimmed reference thresholds, triggering independent delay timers before asserting COUT or DOUT to disable external CHG/DSG FETs.

It features a low-quiescent-current design (4 µA NORMAL, 100 nA shutdown) and operates across –40°C to +85°C. The device supports zero-voltage charging initiation when BAT–V– ≥ 1.7 V and inhibits charging below 0.75 V, enabling safe recovery of deeply discharged cells while maintaining tight threshold accuracy (±10 mV OVP/UVP at 25°C, ±20 mV over temperature).

Key Specifications

Pinout & Package

Package: 6-pin WSON (DSE), 1.50 mm × 1.50 mm × 0.75 mm body size, wettable flank terminals, exposed thermal pad (not electrically connected).

Key Features

Applications

Equivalent & Alternatives

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

Compared with S-8261AAL-M6T1U and R5602L002AA-TR, the BQ29702DSET delivers tighter factory-trimmed thresholds (±10 mV vs ±25 mV), integrated short-circuit detection, and zero-voltage charging - making it optimal for space-constrained, safety-certified portable electronics where deterministic hardware-only protection is mandated.

Availability

BQ29702DSET is available at Aetrix Electronics and suitable for smartphone battery packs, tablet PC power management, and handheld data terminal designs requiring stable component supply, long-lifecycle availability, and automotive-qualified manufacturing traceability.

Supply support for BQ29702DSET 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 leadership in battery management ICs.

The BQ297xx family was designed specifically for cost-effective, high-accuracy hardware-based protection of single-cell Li-ion/Li-polymer battery packs in space-constrained portable electronics.

FAQ

What is the overcharge protection voltage threshold for BQ29702DSET?

The BQ29702DSET has a factory-programmed overcharge detection voltage (VOVP) of 4.350 V with ±10 mV accuracy at 25°C and ±20 mV over –40°C to +85°C. This threshold triggers the COUT output to disable the charge FET after a fixed 1-second delay, preventing lithium plating and thermal instability in the cell. The BQ29702DSET does not allow field adjustment of this value.

How does BQ29702DSET support zero-voltage charging?

The BQ29702DSET enables zero-voltage charging when the voltage between BAT and V– reaches ≥1.7 V, allowing safe reactivation of deeply discharged cells. It inhibits charging below 0.75 V to prevent copper shunting. This function operates autonomously without MCU involvement and is implemented using internal analog comparators - a core feature of the BQ29702DSET design.

What package type and dimensions does BQ29702DSET use?

The BQ29702DSET uses a 6-pin WSON (DSE) package measuring 1.50 mm × 1.50 mm × 0.75 mm with wettable flanks. It is identical in footprint to other BQ297xx variants and requires no thermal pad connection. This ultra-compact package minimizes PCB area in thin-profile portable devices - a defining physical characteristic of the BQ29702DSET.

Can BQ29702DSET detect short-circuit faults, and what is its response time?

Yes, the BQ29702DSET detects load short circuits using its V– input with a factory-set threshold of 0.3 V and a fixed detection delay of 250 µs. Upon detection, it drives DOUT low within the specified timing window to disable the discharge FET - a deterministic hardware response that meets IEC 62368-1 fault containment requirements. This capability is intrinsic to the BQ29702DSET architecture.

What are the key differences between BQ29702DSET and BQ29700DSET?

The BQ29702DSET differs from BQ29700DSET primarily in its factory-programmed thresholds: BQ29702DSET uses 4.350 V OVP (vs 4.275 V), 2.800 V UVP (same), 0.160 V OCD (vs 0.100 V), and 0.3 V SCD (vs 0.5 V), with shorter fault delays (1 s OVP vs 1.25 s, 96 ms UVP vs 144 ms). These calibrated values make the BQ29702DSET better suited for higher-capacity cells requiring tighter voltage margins and faster fault response.