Texas Instruments BQ29717DSER

Overview

BQ29717DSER from Texas Instruments is a single-cell Li-ion/Li-polymer battery protection IC that integrates overvoltage (4.425 V), undervoltage (2.500 V), charge/discharge overcurrent (–0.100 V / 0.130 V), and short-circuit (0.5 V) detection with factory-programmed thresholds and fixed timing delays. It drives external CHG/DSG FETs, supports zero-voltage charging (≥1.7 V), and operates from –40°C to +85°C in a 1.50 mm × 1.50 mm WSON package.

For engineers reviewing the BQ29717DSER datasheet, BQ29717DSER pinout, BQ29717DSER application, or BQ29717DSER equivalent, this page delivers verified electrical parameters, validated pin functions, confirmed protection thresholds for BQ29717DSER specifically, and two technically documented alternative parts - all extracted from TI's official SLUSBU9I datasheet (August 2024 revision).

Technical Context

The BQ29717DSER implements analog voltage sensing across external FETs (V_DS) for precise overcurrent detection with ±10 mV accuracy at 25°C and ±15 mV over full temperature range. Its dual gate-drive outputs (COUT, DOUT) are referenced to BAT and VSS respectively, enabling direct NMOS FET control without level-shifting circuitry.

It operates in NORMAL mode (4 µA typical supply current) or Shutdown mode (100 nA), with factory-programmed fault thresholds and fixed recovery timers: 12 ms for OVP, 8 ms for UVP/OCC/OCD. The device uses an internal oscillator and requires no external clock or configuration pins.

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 BQ29717DSER, BQ29716DSER offers higher discharge overcurrent immunity but less over-discharge headroom, while BQ29718DSER improves fault sensitivity at the expense of robustness in noisy power environments - selection depends on specific battery chemistry, FET R_DS(on), and system-level fault tolerance requirements.

Availability

BQ29717DSER is available at Aetrix Electronics and suitable for mobile handsets, tablet PCs, and handheld data terminals requiring stable component supply, factory-programmed protection consistency, and long-term lifecycle support.

Supply support for BQ29717DSER 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 expertise in battery management solutions.

The BQ297xx family is designed specifically for cost-sensitive, space-constrained single-cell Li-ion/Li-polymer battery packs - delivering integrated, factory-configured protection with minimal external components and ultra-low quiescent current.

FAQ

What protection functions does the BQ29717DSER provide?

The BQ29717DSER provides five core hardware-based protections: overcharge detection (4.425 V), over-discharge detection (2.500 V), charge overcurrent detection (–0.100 V), discharge overcurrent detection (0.130 V), and load short-circuit detection (0.5 V). All thresholds and associated delay timers are factory-programmed and non-adjustable. The BQ29717DSER executes these protections autonomously without host intervention, driving external CHG and DSG FETs to isolate the battery when faults occur.

What is the package type and pin count of the BQ29717DSER?

The BQ29717DSER is housed in a 6-pin WSON (DSE) package measuring 1.50 mm × 1.50 mm × 0.75 mm with wettable flanks. Its pinout consists of BAT (supply input), VSS (ground), V– (negative sense input), COUT (charge FET gate drive), DOUT (discharge FET gate drive), and NC (no connection). This compact, surface-mount package supports high-density PCB layouts in portable electronics.

Does the BQ29717DSER support zero-voltage charging?

Yes, the BQ29717DSER supports zero-voltage charging functionality. It allows charging of fully depleted cells when the battery voltage is near 0 V, provided the charger voltage applied to the BAT pin is ≥1.7 V. This feature is enabled by internal circuitry that bypasses normal UVP lockout under controlled conditions, helping recover cells that would otherwise be unusable - a critical capability for consumer devices with long shelf life requirements.

What are the supply current specifications for the BQ29717DSER in active and shutdown modes?

The BQ29717DSER draws 4 µA typical current in NORMAL operating mode (at 3.8 V BAT, 25°C) and only 100 nA in Shutdown mode. These ultra-low quiescent currents minimize parasitic battery drain during system standby or storage, directly extending operational lifetime and shelf life. The device automatically enters Shutdown mode when BAT falls below the power-on reset threshold (~1.2 V), and resumes NORMAL operation upon valid supply restoration.

How does the BQ29717DSER detect overcurrent conditions?

The BQ29717DSER detects overcurrent by measuring the voltage drop (V_DS) across external CHG and DSG FETs using its differential V– and VSS inputs. For discharge overcurrent, it monitors V– relative to VSS (0.130 V threshold); for charge overcurrent, it monitors VSS relative to V– (–0.100 V threshold). This V_DS-based method eliminates the need for external sense resistors, reduces BOM cost and board area, and achieves ±10 mV accuracy at 25°C - enabling precise current limiting using only the FET's intrinsic R_DS(on).