L6924U

Active

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

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  • 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)

Circuit Diagram

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Quality and Reliability

Part Number Marketing Status Package Grade RoHS Compliance Grade Material Declaration**
L6924UTR
Active
VFQFPN 16 3x3x1.0 Industrial Ecopack2

L6924UTR

Package:

VFQFPN 16 3x3x1.0

Material Declaration**:

Marketing Status

Active

Package

VFQFPN 16 3x3x1.0

Grade

Industrial

RoHS Compliance Grade

Ecopack2

(**) 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.

Sample & Buy

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Marketing Status
ECCN (US)
ECCN (EU)
Packing Type
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Temperature (°C) Country of Origin
Budgetary Price (US$)*/Qty
min
max
L6924UTR Available at 6 distributors

Distributor availability ofL6924UTR

Distributor Name
Region Stock Min. Order Third party link
DIGIKEY WORLDWIDE 4261 1 Order Now
ARROW EUROPE 8000 0 Order Now
Newark Element14 AMERICA 100 0 Order Now
ARROW AMERICA 362 1 Order Now
MOUSER WORLDWIDE 4293 1 Order Now
Farnell Element14 EUROPE 212 1 Order Now

Distributor reported inventory date: 2020-10-20

Distributor Name

DIGIKEY

Stock

4261

Min.Order

1

Region

WORLDWIDE Order Now

ARROW

Stock

8000

Min.Order

0

Region

EUROPE Order Now

Newark Element14

Stock

100

Min.Order

0

Region

AMERICA Order Now

ARROW

Stock

362

Min.Order

1

Region

AMERICA Order Now

MOUSER

Stock

4293

Min.Order

1

Region

WORLDWIDE Order Now

Farnell Element14

Stock

212

Min.Order

1

Region

EUROPE Order Now

Distributor reported inventory date: 2020-10-20

Buy Direct
Active
EAR99 NEC Tape And Reel VFQFPN 16 3x3x1.0 -40 85 PHILIPPINES 0.775 / 1k

L6924UTR

Marketing Status

Active

ECCN (US)

EAR99

Budgetary Price (US$)*/Qty

0.775 / 1k

Distributor availability ofL6924UTR

Distributor Name
Region Stock Min. Order Third party link
DIGIKEY WORLDWIDE 4261 1 Order Now
ARROW EUROPE 8000 0 Order Now
Newark Element14 AMERICA 100 0 Order Now
ARROW AMERICA 362 1 Order Now
MOUSER WORLDWIDE 4293 1 Order Now
Farnell Element14 EUROPE 212 1 Order Now

Distributor reported inventory date: 2020-10-20

Distributor Name

DIGIKEY

Stock

4261

Min.Order

1

Region

WORLDWIDE Order Now

ARROW

Stock

8000

Min.Order

0

Region

EUROPE Order Now

Newark Element14

Stock

100

Min.Order

0

Region

AMERICA Order Now

ARROW

Stock

362

Min.Order

1

Region

AMERICA Order Now

MOUSER

Stock

4293

Min.Order

1

Region

WORLDWIDE Order Now

Farnell Element14

Stock

212

Min.Order

1

Region

EUROPE Order Now

Distributor reported inventory date: 2020-10-20

ECCN (EU)

NEC

Packing Type

Tape And Reel

Package

VFQFPN 16 3x3x1.0

Operating Temperature (°C)

(min)

-40

(max)

85

Budgetary Price (US$)* / Qty

0.775 / 1k

Country of Origin

PHILIPPINES

(*) 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