BQ29707DSER - Li-Ion/Li-Po Single-Cell Battery Protector | TI
Teilenummer: BQ29707DSER ✓ Aktiv| Menge | Stückpreis | Gesamt |
|---|---|---|
| 1 | $0.48 | $0,48 |
| 10 | $0.42 | $4,20 |
| 100 | $0.32 | $32,00 |
| 500 | $0.27 | $135,00 |
| 1.000 | $0.22 | $220,00 |
| 3.000 | $0.18 | $540,00 |
BQ29707DSER Übersicht
A battery protection IC (often called a "secondary protector" or "battery management IC for protection") sits between a single Li-Ion/Li-Po cell and the host load. It continuously samples the cell voltage through Vdd and the pack current through the voltage drop across the external FETs (Vds sensing). When a fault threshold is crossed, the device latches off or releases the charge (CHG) and discharge (DSG) FET gates, isolating the cell to prevent fire, swelling, or capacity loss. The BQ2970 family is the cost-down alternative to TI's higher-feature fuel gauges such as the BQ28z610 and BQ34z100, and pairs naturally with the BQ27421-G1A gauge IC for smart-pack designs.
Key features include a 0 V charge-disabled function, a wide operating temperature range from -40 °C to +85 °C, factory-trimmed thresholds requiring no external programming resistors, and ultra-low quiescent current in both normal and power-down modes. The part offers overcurrent detection on both charge and discharge paths and dedicated short-circuit protection with sub-millisecond response, all on the same die.
Internally the BQ29707DSER uses a precision bandgap reference and a comparator ladder matched to the cell chemistry. The FET driver is a charge-pump architecture capable of holding the external N-FET gates above Vdd during normal operation while pulling them to ground rapidly when a fault is triggered. The result is a single-chip protector with predictable behavior across the full cell state-of-charge window.
Typical applications include single-cell smart-phone spare batteries, wearable packs, TWS earbud charging cases, IoT sensor nodes, and any compact single-cell Li-Po pack that previously used a discrete comparator + dual-FET protection circuit. The 6-WSON footprint suits 1S packs with board space below 4 mm x 4 mm.
When designing, ensure the external N-FETs are logic-level types with low gate threshold, and add an RC snubber on Vdd close to the IC to ride out load transients. The 0 V charge inhibit is factory-set and cannot be disabled; verify that it matches your charger requirements.
This page synthesizes distributor stock and pricing, drop-in pin-compatible alternatives, and practical layout notes not found in the manufacturer datasheet.
Drop-in-Alternativen für BQ29707DSER – gleiches Gehäuse, Pin-kompatibel. Bauteile mit anderem Gehäuse, die eine PCB-Überarbeitung erfordern, sind ausgeschlossen.
Schnellvergleichstool – Wählen Sie Alternativbauteile für den Direktvergleich:
BQ29700DSER
✅ Drop-In📋 Referenzalternative (nicht im Katalog)
BQ29706DSER
✅ Drop-In📋 Referenzalternative (nicht im Katalog)
BQ29704DSER
✅ Drop-In📋 Referenzalternative (nicht im Katalog)
BQ29702DSER
✅ Drop-In📋 Referenzalternative (nicht im Katalog)
R5400N110KA
✅ Drop-In📋 Referenzalternative (nicht im Katalog)
BQ29707DSER Technische Daten
| Battery Type | Li-Ion / Li-Polymer (single-cell) |
| Funktion | Voltage and current protection IC |
| Gehäuse | 6-WSON (DSE), 1.5 mm x 1.5 mm |
| Pin-Anzahl | 6 |
| Terminal Pitch | 0.5 mm |
| Max Seated Height | 0.8 mm |
| Betriebstemperatur | -40 °C to +85 °C |
| Nominal Cell Voltage | 3.6 V |
| Overcharge Detection | Factory-trimmed (BQ29707 variant) |
| 0 V Charge Disable | Yes |
| FET Type Controlled | External N-channel, charge + discharge |
| Short-Circuit Protection | Yes |
| Montageart | Surface Mount |
| RoHS-Status | Compliant |
BQ29707DSER Pin-Konfiguration
| Pin 1 | Vdd — Battery positive supply and cell voltage sense input |
| Pin 2 | NC — Not connected (per datasheet) |
| Pin 3 | GND — IC ground reference |
| Pin 4 | CHG — Charge FET gate drive output |
| Pin 5 | DSG — Discharge FET gate drive output |
| Pin 6 | V- — Battery pack negative sense (P- connection) |
Typische Anwendungen
BQ29707DSER ist geeignet für 7 Anwendungs: Wearable / TWS Earbud Battery Pack, IoT Sensor Node Li-Ion Pack, Smart-Phone Spare Battery Pack, Bluetooth Tracker Battery, Medical Sensor Patch Battery, Handheld Barcode Scanner Battery, Drone / UAV Li-Po Single-Cell Pack.
Wearable / TWS Earbud Battery Pack
The BQ29707DSER protects a single Li-Po cell inside wearable and TWS earbud charging cases where PCB area is dominated by the cell, not the protection circuit. Its 1.5 mm x 1.5 mm 6-WSON footprint fits inside a 4 mm x 4 mm BGA-style land pattern, leaving room for the cell tab. The factory-trimmed overcharge (4.3 V) and overdischarge (2.4 V) thresholds match standard Li-Po chemistry without external resistor selection. The chip drives two N-FETs that disconnect the pack from USB-C charging and the speaker driver load during a fault, preventing swelling or thermal runaway. Pair with TI BQ27421-G1A for fuel-gauging-aware smart packs.
Empfohlen
IoT Sensor Node Li-Ion Pack
Remote IoT sensor nodes powered by a single 14500 or 18650 Li-Ion cell rely on the BQ29707DSER for years of unattended operation. The IC's sub-microampere power-down quiescent current extends shelf life, while the -40 °C to +85 °C operating range covers outdoor enclosure environments. The chip monitors the cell through Vdd and external FET Vds, latches the discharge FET off when the cell drops below 2.4 V, and disables charging below 0 V to prevent copper-shuttle plating. The 6-WSON footprint lets the protection circuitry sit on a sliver of board next to the cell can.
Empfohlen
Smart-Phone Spare Battery Pack
Spare 1S Li-Po battery packs use the BQ29707DSER to ensure a cell sold to the consumer cannot be overcharged by a non-compliant USB charger. The IC's 0 V charge inhibit blocks trickle-charge attempts on a deeply discharged cell, while the overcurrent and short-circuit paths protect against fault conditions in the cable or load. The WSON-6 DSE package, with 0.5 mm pitch, is small enough to mount under the cell tab area in a slim pack form factor. TI's quality flow supports consumer-pack traceability requirements.
Empfohlen
Bluetooth Tracker Battery
Bluetooth asset trackers (e.g., key finders) run on a single Li-Po coin or pouch cell. The BQ29707DSER protects this cell against deep-discharge damage during long idle periods by latching DSG off at 2.4 V. The IC's wide operating temperature range handles temperature swings inside a car dashboard or warehouse. Its tiny WSON-6 footprint consumes less than 3 mm x 3 mm, leaving room for the BLE SoC, antenna, and piezo sounder on the same PCB. Factory-trimmed thresholds remove trim resistors and reduce BOM count by four parts.
Empfohlen
Medical Sensor Patch Battery
Single-use medical sensor patches - continuous glucose monitors, ECG patches, temperature sensors - use a primary Li-Po or Li-MnO2 cell with the BQ29707DSER as the overdischarge safeguard. The IC prevents the cell from dropping below the irreversible damage threshold, preserving diagnostic data integrity at end of life. The factory-trimmed 4.3 V overcharge threshold protects against inductive charging spikes from an external RF field. With the -40 °C to +85 °C range, the chip survives autoclave-style sterilization at the higher end and refrigerated storage at the lower end.
Empfohlen
Handheld Barcode Scanner Battery
Industrial handheld barcode scanners use a single Li-Ion 18650 or 21700 cell protected by the BQ29707DSER. The IC sustains high discharge-current pulses from the scanner's laser or imager without false-triggering the overcurrent comparator, then immediately latches the DSG FET if a true short-circuit occurs in the cable harness. The 6-WSON DSE package survives mechanical shock from drops up to 2 m thanks to its small mass and high lead-frame rigidity. Pair with TI BQ25703ARSNT for fast-charge-capable scanner docks.
Empfohlen
Drone / UAV Li-Po Single-Cell Pack
Micro-drones and indoor UAVs powered by a single Li-Po cell rely on the BQ29707DSER to cut off discharge when the cell drops below 3.0 V under high current draw, protecting the pack from catastrophic overdischarge during aggressive maneuvers. The IC's sub-millisecond short-circuit response protects the motor ESC and wiring harness from a prop-stop event. The 6-WSON footprint fits inside a 30 mm x 30 mm airframe, leaving more room for the flight controller and motors. Operating temperature covers cold-storage to summer-day flight envelopes.
Empfohlen
Zusammenfassung der empfohlenen Produkte
Technische Referenzdaten für BQ29707DSER – Vergleich, Designhinweise und Compliance-Informationen.
Auswahlhilfe
Vergleich mit Alternativen
| Parameter | Dieses Produkt | BQ29700DSER | BQ29706DSER | BQ29704DSER | BQ29702DSER | R5400N110KA |
|---|---|---|---|---|---|---|
| Package | 6-WSON (DSE) 1.5x1.5 mm | 6-WSON (DSE) - same | 6-WSON (DSE) - same | 6-WSON (DSE) - same | 6-WSON (DSE) - same | WSON-6 1.5x1.5 mm - same |
| Brand | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments | ABLIC |
| Battery Chemistry | Li-Ion / Li-Po | Li-FePO4 | Li-Ion / Li-Po | Li-Ion / Li-Po | Li-Ion / Li-Po | Li-Ion / Li-Po |
| Overcharge Threshold | 4.30 V | 3.75 V (Li-FePO4) | 4.30 V | 4.25 V | 4.35 V | 4.30 V |
| Overdischarge Threshold | 2.40 V | 2.00 V | 2.40 V | 2.40 V | 2.40 V | 2.50 V |
| 0 V Charge Disable | Yes | Yes | Yes | Yes | Yes | Yes |
| Operating Temperature | -40 °C to +85 °C | -40 °C to +85 °C | -40 °C to +85 °C | -40 °C to +85 °C | -40 °C to +85 °C | -40 °C to +85 °C |
| Pin Count | 6 | 6 | 6 | 6 | 6 | 6 |
Wichtigste Unterscheidungsmerkmale
- Factory-trimmed thresholds eliminate external programming resistors (vs. Discrete comparator + reference solution)
- Smaller package than legacy DW01A (vs. DW01A)
- Wide chemistry coverage within a single pinout (vs. BQ29700DSER (Li-FePO4))
Designhinweise
Place the BQ29707DSER within 3 mm of the cell positive and negative tabs. Use 0.5 mm pitch PCB traces with at least 0.1 mm spacing to handle the 6-WSON land pattern reliably at high-volume SMT. Add a 0.1 µF X7R bypass capacitor between Vdd (pin 1) and V- (pin 6), placed within 1 mm of the IC, to ride out load transients and prevent nuisance overcurrent triggering during inrush.
Route the CHG and DSG gate-drive traces (pins 4, 5) to the gates of external N-FETs with the shortest possible trace length, ideally less than 5 mm, to limit gate-loop inductance. Use a ground pour under the IC body to dissipate the thermal return path and to provide a Kelvin connection at the V- sense pin. Avoid running noisy switching currents near the Vdd sense trace to prevent false overcharge triggers during load transients.
Do NOT connect the IC to a charger without first verifying the 0 V charge inhibit behavior matches the charger startup. Some legacy chargers apply a trickle voltage that the BQ29707DSER will block, leaving the cell uncharged. Always select external N-FETs with gate threshold Vgs(th) below 2.5 V at the IC's Vdd of 3.0 V to ensure full enhancement during normal operation. FETs with higher Vgs(th) will cause excessive heating and voltage drop.
Compliance-Informationen
RoHS and REACH compliance per TI product page. Not AEC-Q100 qualified; for automotive battery protection see TI BQ7718 family. Lead-free reflow profile per JEDEC J-STD-020.
