Texas Instruments BQ29723DSER

Overview

BQ29723DSER from Texas Instruments is a single-cell Li-ion/Li-polymer battery protection IC that provides overvoltage (4.425 V), undervoltage (2.500 V), charge/discharge overcurrent (–0.060 V / 0.100 V), and short-circuit (0.3 V) detection with factory-programmed thresholds and fixed timing delays. It drives external CHG/DSG FETs and operates down to 1.5 V input, supporting zero-voltage charging for deeply depleted cells in portable power systems.

For engineers reviewing the BQ29723DSER datasheet, BQ29723DSER pinout, BQ29723DSER application, or BQ29723DSER equivalent, this device delivers precise, low-quiescent-current (4 µA NORMAL mode, 100 nA shutdown) cell-level protection without requiring a host microcontroller - critical for space-constrained, battery-powered consumer electronics where reliability and standby efficiency are paramount.

Technical Context

The BQ29723DSER implements analog voltage and current fault sensing across external FETs using differential inputs (V– and VSS) to detect overcurrent via V_DS measurement with ±5 mV typical accuracy. Its internal comparators and fixed-timer logic autonomously control COUT and DOUT gate drive outputs without firmware intervention.

It features factory-programmed protection thresholds and delay timers - including 1 s OVP delay, 96 ms UVP delay, 4 ms OCC delay, 8 ms OCD delay, and 250 µs SCD delay - all non-adjustable post-manufacture. The device supports zero-voltage charging initiation at ≥1.7 V and inhibition below 0.75 V, enabling safe recovery of fully discharged cells.

Key Specifications

Pinout & Package

Package: 6-pin WSON (DSE), 1.50 mm × 1.50 mm × 0.75 mm body size, wettable flank terminals.

Key Features

Applications

Equivalent & Alternatives

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

Compared with BQ29723DSER, BQ29728DSER offers higher UVP (2.800 V vs. 2.500 V) and longer UVP delay (144 ms vs. 96 ms) for robustness against transient voltage sag, while BQ29733DSER provides faster UVP response (20 ms) and tighter OCD threshold (0.120 V) for precision current limiting - all share identical WSON-6 packaging and zero-voltage charging capability.

Availability

BQ29723DSER 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 authentic sourcing from Texas Instruments.

Supply support for BQ29723DSER 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 connectivity solutions for industrial, automotive, and consumer markets.

The BQ297xx family is designed specifically for cost-effective, autonomous protection of single-cell Li-ion and Li-polymer battery packs - emphasizing ultra-low power, factory-configured reliability, and minimal external component count.

FAQ

What protection functions does the BQ29723DSER provide?

The BQ29723DSER provides overcharge protection (OVP at 4.425 V), over-discharge protection (UVP at 2.500 V), charge overcurrent protection (OCC at –0.060 V), discharge overcurrent protection (OCD at 0.100 V), and load short-circuit protection (SCD at 0.3 V). All thresholds and associated delay timers are factory-programmed and non-adjustable. The BQ29723DSER executes these protections autonomously using its COUT and DOUT gate drive outputs to control external FETs without host processor intervention.

What is the operating voltage range for the BQ29723DSER?

The BQ29723DSER operates with a BAT supply voltage from –0.3 V to 8 V, and supports V– pin voltages from BAT – 25 V to BAT. This allows it to function across the full Li-ion cell voltage range (2.5 V to 4.4 V) and tolerate common adapter overvoltage conditions. The device remains functional down to 1.5 V input, enabling zero-voltage charging initiation when the battery voltage recovers to ≥1.7 V - a key capability confirmed in the BQ29723DSER datasheet's DC characteristics section.

Does the BQ29723DSER support zero-voltage charging?

Yes, the BQ29723DSER supports zero-voltage charging: it permits charging initiation when the battery voltage is 0 V, provided the charger voltage applied to the BAT pin is ≥1.7 V (V0CHG parameter). Charging is inhibited if the battery voltage falls below 0.75 V (V0INH parameter). This functionality is implemented entirely in hardware and requires no external configuration - a verified feature of the BQ29723DSER used in portable electronics for recovering deeply depleted cells.

What package type and dimensions does the BQ29723DSER use?

The BQ29723DSER uses a 6-pin WSON package (also labeled DSE), with nominal dimensions of 1.50 mm × 1.50 mm × 0.75 mm. It features wettable flank terminals to enable reliable solder joint inspection during automated optical inspection (AOI) in high-volume manufacturing. Pin configuration is standardized across the BQ297xx family: NC, COUT, DOUT, VSS, BAT, and V– - matching the mechanical drawing in the BQ29723DSER datasheet Section 12.

How does the BQ29723DSER achieve low power consumption?

The BQ29723DSER achieves ultra-low power consumption through dedicated operating modes: NORMAL mode draws only 4 µA (typical) at 3.8 V, while Shutdown mode reduces current to 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 are validated across –40°C to +85°C. This enables multi-year battery shelf life and extended standby in always-on portable devices - a core specification confirmed in the BQ29723DSER's DC Characteristics table (Section 6.5).