Texas Instruments BQ29701DSET

Overview

BQ29701DSET from Texas Instruments is a single-cell Li-ion/Li-polymer battery protection IC that integrates overvoltage (4.280 V), undervoltage (2.300 V), charge/discharge overcurrent (–0.100 V / 0.125 V), and short-circuit (0.5 V) detection with factory-programmed thresholds and fixed timing delays. It drives external CHG/DSG FETs and supports zero-voltage charging for deeply depleted cells in portable power systems.

For engineers reviewing the BQ29701DSET datasheet, BQ29701DSET pinout, BQ29701DSET application, or BQ29701DSET equivalent, this device delivers precision ±5 mV OCP sensing, ultra-low 4 µA NORMAL-mode current, and 100 nA shutdown quiescent draw - critical for battery runtime optimization in space-constrained handheld electronics.

Technical Context

The BQ29701DSET implements analog voltage and current fault monitoring using differential sensing across external FETs (V– to VSS), with dedicated comparators and fixed internal timers for each protection event. Its architecture avoids microcontroller dependency by embedding hardwired logic for OVP/UVP/OCC/OCD/SCP triggering and recovery sequencing.

Protection thresholds are factory-programmed and non-adjustable; timing parameters include 1.25 s OVP delay, 144 ms UVP delay, 8 ms OCC/OCD delays, and 250 µs SCD delay. The device operates from –40°C to +85°C and tolerates BAT-to-V– differential up to 25 V, enabling robust integration into unregulated charger paths.

Key Specifications

Pinout & Package

The BQ29701DSET uses a 6-pin WSON (DSE) package measuring 1.50 mm × 1.50 mm × 0.75 mm, optimized for high-density battery pack PCB layouts with minimal footprint and thermal resistance (θJA = 190.5°C/W).

Key Features

Applications

Equivalent & Alternatives

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

Compared with BQ29700DSET and BQ29702DSET, the BQ29701DSET provides a balanced protection profile optimized for standard 4.2 V Li-ion cells - offering mid-range OVP (4.280 V), aggressive UVP (2.300 V) for deep-discharge resilience, and 0.125 V OCD sensitivity ideal for low-R_DS(on) FETs in compact designs.

Availability

BQ29701DSET is available at Aetrix Electronics and suitable for tablet PCs, mobile handsets, and handheld data terminals requiring stable component supply, long-term lifecycle support, and guaranteed traceability for medical and industrial end equipment.

Supply support for BQ29701DSET 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 delivering analog, embedded processing, and power management solutions with emphasis on reliability, precision, and energy efficiency.

The BQ297xx family is designed specifically for cost-sensitive, space-constrained single-cell Li-ion/Li-polymer battery packs - delivering integrated hardware protection without firmware or external components.

FAQ

What protection functions does the BQ29701DSET provide?

The BQ29701DSET provides overcharge protection (OVP at 4.280 V), over-discharge protection (UVP at 2.300 V), charge overcurrent protection (OCC at –0.100 V), discharge overcurrent protection (OCD at 0.125 V), and load short-circuit protection (SCP at 0.5 V). All thresholds are factory-programmed and non-adjustable. Each fault triggers dedicated internal timers before CHG or DSG FET gate drive outputs respond, and recovery occurs automatically after fixed delay periods. The BQ29701DSET also enables zero-voltage charging when the charger voltage exceeds 1.7 V.

What is the package type and pin configuration of the BQ29701DSET?

The BQ29701DSET uses a 6-pin WSON (DSE) package measuring 1.50 mm × 1.50 mm × 0.75 mm. Its pins are: NC (no connection), COUT (charge FET gate drive output), DOUT (discharge FET gate drive output), VSS (ground reference), BAT (battery positive supply input), and V– (negative sense input for OCP/SCP detection). Pin 1 is NC and must remain unconnected; V– connects externally to pack– via a 2.2 kΩ resistor per TI application guidance. The BQ29701DSET requires no external passive components for basic protection functionality.

How does the BQ29701DSET achieve ultra-low power consumption?

The BQ29701DSET achieves ultra-low power consumption through two distinct operating modes: NORMAL mode draws only 4 µA at 3.8 V, and Shutdown mode consumes just 100 nA. These values are measured under specified conditions (BAT = 3.8 V, V– = 0 V for NORMAL; BAT = V– = 1.5 V for Shutdown) and reflect the device's fully integrated analog architecture with no active digital core. The BQ29701DSET automatically enters Shutdown mode when BAT falls below the POR threshold (~1.2 V), preserving battery energy during storage - a key enabler for long-shelf-life portable devices.

Can the BQ29701DSET support zero-voltage charging, and how does it work?

Yes, the BQ29701DSET supports zero-voltage charging to safely recover deeply depleted Li-ion cells. It enables charging when the charger voltage applied to the BAT pin exceeds 1.7 V (V0CHG threshold), even if the cell voltage is 0 V. Charging is inhibited if the cell voltage drops below 0.75 V (V0INH threshold) during the process. This function is implemented entirely in hardware with no external components required. The BQ29701DSET monitors the differential between BAT and V– to determine eligibility, ensuring controlled pre-charge before full-rate charging resumes - a critical feature for consumer electronics with infrequent usage patterns.

What are the key timing parameters for fault detection and recovery in the BQ29701DSET?

The BQ29701DSET uses fixed, factory-programmed timing parameters: overcharge detection delay is 1.25 s, over-discharge detection delay is 144 ms, charge/discharge overcurrent detection delay is 8 ms, and short-circuit detection delay is 250 µs. Recovery timers are also fixed: OVP recovery is 12 ms, and UVP/OCC/OCD recovery is 8 ms. These delays begin counting only after the fault condition is met and expire before the device checks for recovery conditions - meaning the FETs remain disabled for the full duration regardless of transient clearing. The BQ29701DSET does not support user-adjustable timing; all values are immutable per device variant.