USB compatible battery charger system with integrated power switch for Li-Ion/Li-Polymer

The L6924U is a fully monolithic battery charger that safely charges single-cell Li-Ion/Polymer battery from either a USB power source or an AC adapter. In USB mode, the L6924U supports both low-power and high-power mode. Alternatively the device can charge from an AC wall adapter. The ideal solution for space-limited portable products integrates the power MOSFET, reverse blocking diode, sense resistor and thermal protection into a compact VFQFPN16 package. When an external voltage regulated adapter or USB port is used, the L6924U works in linear mode, and charges the battery in a constant current constant voltage (CC/CV) profile. Moreover, when a current-limited adapter is used, the device can operate in quasi-pulse mode, dramatically reducing the power dissipation. Regardless of the charging approach, a closed-loop thermal control avoids device overheating. The device has an operating input voltage ranging from 2.5 V to 12 V and it allows the user to program many parameters, such as fast-charge current, end-of-charge current threshold, and charge timer. The L6924U offers two open collector outputs for diagnostic purposes, which can be used to either drive two external LEDs or communicate with a host microcontroller. Finally, the L6924U also provides other features like gas gauge function, checks for battery presence, and monitors and protects the battery from unsafe thermal conditions.

Key Features

  • Fully integrated solution, with power MOSFET, reverse blocking diode, sense resistor, and thermal protection
  • Charges single-cell Li-Ion batteries from selectable AC adapter or USB input
  • Programmable charge current up to 1 A in AC adapter mode
  • Programmable charging current in USB mode for both high-power and low-power inputs
  • 4.2 V output voltage with ± 1 % accuracy
  • Linear or quasi-pulse operating mode
  • Closed-loop thermal control
  • Programmable end-of-charge current
  • Programmable charge timer
  • (NTC) or (PTC) thermistor interface for battery temperature monitoring and protection
  • Status outputs to drive LEDs or to interface with a host processor
  • Small VFQFPN 16-lead package (3 x 3 mm)

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リソース

技術文書

製品スペック
Description バージョン サイズ
DS5829 DS5829: USB compatible battery charger system with integrated power switch for Li-Ion/Li-Polymer 3.0 1 MB
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Publications and Collaterals

セレクションガイド
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Linear and Switching Voltage Regulators Selection Guide 3.0 370 KB
パンフレット
Description バージョン サイズ
Brochure Power management guide 09.2017 2 MB

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サンプル & 購入

製品型番 パッケージ Packing Type Marketing Status Unit Price (US$) * 数量 ECCN (EU) ECCN (US) Country of Origin More info Order from ST Order from Distributors
L6924UTR VFQFPN 16 3x3x1.0 Tape And Reel Active 0.775 1000 NEC EAR99 PHILIPPINES MORE INFO DISTRIBUTOR AVAILABILITY
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(*) Suggested Resale Price per unit (USD) for BUDGETARY USE ONLY. For quotes, prices in local currency, please contact your local ST Sales Office  or our Distributors

品質 & 信頼性

製品型番 Marketing Status パッケージ Grade RoHS Compliance Grade Material Declaration**
L6924UTR アクティブVFQFPN 16 3x3x1.0IndustrialEcopack2 0 0
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(**) The Material Declaration forms available on st.com may be generic documents based on the most commonly used package within a package family. For this reason, they may not be 100% accurate for a specific device. Please contact our sales support for information on specific devices.

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