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電池充電器 IC

BQ21040

現行

單芯、0.8-A 鋰離子和鋰聚合物電池充電器

立即訂購
產品規格表

現在提供此產品的更新版本

open-in-new 比較替代產品
功能相同，但針腳輸出與所比較的裝置不同。
BQ25170 現行 適用於單節鋰離子和磷酸鐵鋰電池的 800mA 線性電池充電器 BQ25170 comes with lower quiescent current and flexible charge voltage.

BQ21040

現行
產品規格表 立即訂購

產品詳細資料

Rating Catalog Number of series cells 1 Cell chemistry Li-Ion/Li-Polymer Charge current (max) (A) 0.8 Features BAT temp thermistor monitoring (hot/cold profile), Input OVP Vin (min) (V) 3.5 Vin (max) (V) 6.45 Absolute max Vin (max) (V) 30 Control topology Linear Battery charge voltage (min) (V) 4.2 Battery charge voltage (max) (V) 4.2 Control interface Standalone (RC-Settable) Operating temperature range (°C) 0 to 125
Rating Catalog Number of series cells 1 Cell chemistry Li-Ion/Li-Polymer Charge current (max) (A) 0.8 Features BAT temp thermistor monitoring (hot/cold profile), Input OVP Vin (min) (V) 3.5 Vin (max) (V) 6.45 Absolute max Vin (max) (V) 30 Control topology Linear Battery charge voltage (min) (V) 4.2 Battery charge voltage (max) (V) 4.2 Control interface Standalone (RC-Settable) Operating temperature range (°C) 0 to 125
SOT-23 (DBV) 6 8.12 mm² (2.9 mm × 2.8 mm)
  • Charging
    • 1% Charge Voltage Accuracy
    • 10% Charge Current Accuracy
    • Low Battery Leakage Current (1 µA)
    • Programmable Charge Current using External Resistor up to 800 mA
    • 4.2-V Li-Ion and Li-Pol Charger
  • Protection
    • 30-V Input Rating; with 6.6-V Input Overvoltage Protection
    • Input Voltage Dynamic Power Management
    • 125°C Thermal Regulation; 150°C Thermal Shutdown Protection
    • OUT Short-Circuit Protection and ISET Short Detection
    • Overtemperature Sensing Protection Through NTC
    • Fixed 10-Hour Safety Timer
  • System
    • Status Indication – Charging/Done
    • Available in Small SOT-23 Package
  • Charging
    • 1% Charge Voltage Accuracy
    • 10% Charge Current Accuracy
    • Low Battery Leakage Current (1 µA)
    • Programmable Charge Current using External Resistor up to 800 mA
    • 4.2-V Li-Ion and Li-Pol Charger
  • Protection
    • 30-V Input Rating; with 6.6-V Input Overvoltage Protection
    • Input Voltage Dynamic Power Management
    • 125°C Thermal Regulation; 150°C Thermal Shutdown Protection
    • OUT Short-Circuit Protection and ISET Short Detection
    • Overtemperature Sensing Protection Through NTC
    • Fixed 10-Hour Safety Timer
  • System
    • Status Indication – Charging/Done
    • Available in Small SOT-23 Package

The bq21040 device is a highly integrated Li-Ion and Li-Pol linear battery charger device targeted at space-limited portable applications. The device operates from either a USB port or AC adapter. The high input voltage range with input overvoltage protection supports low-cost unregulated adapters.

The bq21040 has a single power output that charges the battery. A system load can be placed in parallel with the battery as long as the average system load does not keep the battery from charging fully during the 10 hour safety timer.

The battery is charged in three phases: conditioning, constant current and constant voltage. In all charge phases, an internal control loop monitors the IC junction temperature and reduces the charge current if an internal temperature threshold is exceeded.

The charger power stage and charge current sense functions are fully integrated. The charger function has high accuracy current and voltage regulation loops, charge status display, and charge termination. The pre-charge current and termination current threshold are fixed to 20% and 10%, respectively. The fast charge current value is programmable through an external resistor.

The bq21040 device is a highly integrated Li-Ion and Li-Pol linear battery charger device targeted at space-limited portable applications. The device operates from either a USB port or AC adapter. The high input voltage range with input overvoltage protection supports low-cost unregulated adapters.

The bq21040 has a single power output that charges the battery. A system load can be placed in parallel with the battery as long as the average system load does not keep the battery from charging fully during the 10 hour safety timer.

The battery is charged in three phases: conditioning, constant current and constant voltage. In all charge phases, an internal control loop monitors the IC junction temperature and reduces the charge current if an internal temperature threshold is exceeded.

The charger power stage and charge current sense functions are fully integrated. The charger function has high accuracy current and voltage regulation loops, charge status display, and charge termination. The pre-charge current and termination current threshold are fixed to 20% and 10%, respectively. The fast charge current value is programmable through an external resistor.
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重要文件 類型 標題 格式選項 下載最新的英文版本 日期
* 資料表 bq21040 0.8-A, Single-Input, Single Cell Li-Ion and Li-Pol Battery Charger datasheet (Rev. D) PDF | HTML 2019/1/8
應用說明 Temperature Sensing Without an Adaptor Present on the BQ21040 PDF | HTML 2022/9/15
應用說明 BQ2404x, BQ2405x, and BQ2409x Frequently Asked Questions 2019/2/25
類比設計期刊 2Q 2016 Analog Applications Journal Issue 2016/4/26
類比設計期刊 Battery-charging considerations for low-power applications 2016/4/26

設計與開發

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開發板

BQ21040EVM-777 — BQ21040 0.8A 單輸入單節鋰離子電池充電器評估模組

bq2404x 系列裝置為高度整合的鋰離子線性充電器，專為空間有限的攜帶型應用設計。該裝置可由 USB 連接埠或交流電源適配器供電，並具有單一電源輸出用以充電電池。系統負載可與電池並聯，只要平均系統負載不會在 10 小時安全計時器期間阻止電池完全充電。充電器的功率階段及充電電流感測功能皆已完全整合。充電器功能包含高精度的電流及電壓調節迴路、充電狀態顯示以及充電終止。bq24040 的預充電電流與終止電流閾值可透過外接電阻進行設定。快速充電電流值亦可透過外接電阻進行調整。
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