제품 상세 정보

Function Protection Number of series cells (min) 4, 5, 6, 7, 8 Number of series cells (max) 5, 6, 7, 8 Features Cell balancing, FET drive, LDO output, Overvoltage Operating current (typ) (µA) 5 Rating Catalog Vin (max) (V) 50 Overvoltage protection 4.2 Operating temperature range (°C) -40 to 85 Battery overvoltage protection (min) (V) 4.15 Battery overvoltage protection (max) (V) 4.25
Function Protection Number of series cells (min) 4, 5, 6, 7, 8 Number of series cells (max) 5, 6, 7, 8 Features Cell balancing, FET drive, LDO output, Overvoltage Operating current (typ) (µA) 5 Rating Catalog Vin (max) (V) 50 Overvoltage protection 4.2 Operating temperature range (°C) -40 to 85 Battery overvoltage protection (min) (V) 4.15 Battery overvoltage protection (max) (V) 4.25
TSSOP (DBT) 38 62.08 mm² 9.7 x 6.4
  • 4-, 5-, 6-, 7-, or 8-Series Cell Protection
  • Individual Cell-Voltage Monitoring
  • Low-Side NMOS FET Drive for Charge and Discharge Control
  • Compatible With 1-mΩ Current-Sense Resistor
  • Supply-Voltage Range From 5.6 V to 40 V
  • Integrated 3.3-V Micro-Power LDO Regulator
  • Low Supply Current
    • Normal Mode: 50 µA, Typical
    • Shutdown Mode, LDO OFF: 5 µA, Typical
  • 38-Pin TSSOP Package
  • Internal 50-mA Automatic Cell Balancing
  • 4-, 5-, 6-, 7-, or 8-Series Cell Protection
  • Individual Cell-Voltage Monitoring
  • Low-Side NMOS FET Drive for Charge and Discharge Control
  • Compatible With 1-mΩ Current-Sense Resistor
  • Supply-Voltage Range From 5.6 V to 40 V
  • Integrated 3.3-V Micro-Power LDO Regulator
  • Low Supply Current
    • Normal Mode: 50 µA, Typical
    • Shutdown Mode, LDO OFF: 5 µA, Typical
  • 38-Pin TSSOP Package
  • Internal 50-mA Automatic Cell Balancing

The bq77908A is a battery protection and cell balancing device intended for Li-Ion and Li-Polymer battery packs.

The bq77908A monitors 4- to 8-series individual cell voltages and provides fast-acting outputs that may be used to drive N-channel MOSFETs to interrupt the power path. Activation delays and recovery methods for safety conditions are fully programmable in non-volatile memory.

Automatic cell balancing is provided using internal 50-mA cell circuits. A robust balancing algorithm ensures optimum performance by maintaining all cell voltages in balance. Balancing may be configured to operate at all times, only during charge, or can be disabled completely.

Additional advanced safety features of the bq77908A include the ability to control split power-path MOSFETs, an open-cell sense-line detection mechanism, and the ability to detect an open or shorted external temperature sensor fault condition.

Programmable Protection Functions

  • Wide range of programmable detection thresholds and delay times
  • Configurable for multiple cell types and application requirements:
    • Cell overvoltage
    • Cell undervoltage
    • Pack discharge overcurrent
    • Pack discharge short circuit
    • Pack charge short-circuit current
  • Variable gain (×1 or ×5) current-sense circuit
    • Compatible with a wide range of current-sense resistors (1-mΩ to 5-mΩ typical) sized for application requirements

Fixed Hardware Protection Functions

  • Preset overtemperature protections
  • Open-cell detection
  • Open and shorted thermistor detection
  • Brownout protection quickly shuts off FETs under low-battery conditions to minimize the risk of FET overheating

The bq77908A is a battery protection and cell balancing device intended for Li-Ion and Li-Polymer battery packs.

The bq77908A monitors 4- to 8-series individual cell voltages and provides fast-acting outputs that may be used to drive N-channel MOSFETs to interrupt the power path. Activation delays and recovery methods for safety conditions are fully programmable in non-volatile memory.

Automatic cell balancing is provided using internal 50-mA cell circuits. A robust balancing algorithm ensures optimum performance by maintaining all cell voltages in balance. Balancing may be configured to operate at all times, only during charge, or can be disabled completely.

Additional advanced safety features of the bq77908A include the ability to control split power-path MOSFETs, an open-cell sense-line detection mechanism, and the ability to detect an open or shorted external temperature sensor fault condition.

Programmable Protection Functions

  • Wide range of programmable detection thresholds and delay times
  • Configurable for multiple cell types and application requirements:
    • Cell overvoltage
    • Cell undervoltage
    • Pack discharge overcurrent
    • Pack discharge short circuit
    • Pack charge short-circuit current
  • Variable gain (×1 or ×5) current-sense circuit
    • Compatible with a wide range of current-sense resistors (1-mΩ to 5-mΩ typical) sized for application requirements

Fixed Hardware Protection Functions

  • Preset overtemperature protections
  • Open-cell detection
  • Open and shorted thermistor detection
  • Brownout protection quickly shuts off FETs under low-battery conditions to minimize the risk of FET overheating

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관심 가지실만한 유사 제품

open-in-new 대안 비교
비교 대상 장치와 유사한 기능
BQ77915 활성 자율 셀 밸런싱을 지원하는 3~5시리즈 적층형 초저전력 기본 보호기 This product is a 3-series to 5-series stackable ultra-low-power primary protector with autonomous cell balancing.

기술 자료

star =TI에서 선정한 이 제품의 인기 문서
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4개 모두 보기
유형 직함 날짜
* Data sheet bq77908A Multi-Cell Lithium-Ion/Polymer Precision Protector datasheet (Rev. A) 2014/09/22
Application note Programming Software for bq77910 and bq77908 2012/07/09
Application note bq77908/910 series FET Considerations (Rev. A) 2012/04/25
EVM User's guide bq77908AEVM Evaluation Module 2012/01/26

설계 및 개발

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TSSOP (DBT) 38 Ultra Librarian

주문 및 품질

포함된 정보:
  • RoHS
  • REACH
  • 디바이스 마킹
  • 납 마감/볼 재질
  • MSL 등급/피크 리플로우
  • MTBF/FIT 예측
  • 물질 성분
  • 인증 요약
  • 지속적인 신뢰성 모니터링
포함된 정보:
  • 팹 위치
  • 조립 위치

권장 제품에는 본 TI 제품과 관련된 매개 변수, 평가 모듈 또는 레퍼런스 디자인이 있을 수 있습니다.

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