Battery charger system with integrated power switch for Li-Ion/Li-Polymer

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  • The L6924D is a fully monolithic battery charger dedicated to single-cell Li-Ion/Polymer battery packs. It is the ideal solution for space-limited applications, like handheld equipment, and digital cameras. It integrates all of the power elements (the power MOSFET, reverse blocking diode and the sense resistor) in a small VFQFPN16 (3 x 3 mm) package. When an external voltage-regulated wall adapter is used, the L6924D 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. The L6924D allows the user to program many parameters, such as pre-charge current, fast-charge current, pre-charge voltage threshold, end-of-charge current threshold, and charge timer. The L6924D 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 L6924D also provides very flexible control of the charge process termination and gas gauge capability, as well as other functions, such as checking for battery presence, and monitoring and protecting the battery from unsafe thermal conditions.

    Key Features

    • Fully integrated solution, with a power MOSFET, reverse blocking diode, sense resistor, and thermal protection
    • Ideal for coke and graphite anode single-cell LI-ION packs
    • Both linear and quasi-pulse operation
    • Closed loop thermal control
    • USB BUS-compatible
    • Programmable charge current up to 1 A
    • Programmable pre-charge current
    • Programmable end-of-charge current
    • Programmable pre-charge voltage threshold
    • Programmable charge timer
    • Programmable output voltage at 4.1 V and 4.2 V, with ± 1 % output voltage accuracy
    • (NTC) or (PTC) thermistor interface for battery temperature monitoring and protection
    • Flexible charge process termination
    • 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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Part Number
Package
Packing Type
Marketing Status
Budgetary Price (US$)*
Quantity
ECCN (US)
Country of Origin
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L6924D013TR VFQFPN 16 3x3x1.0 Tape And Reel
Active
0.75 10000 EAR99 PHILIPPINES Check Availability

Distributor availability ofL6924D013TR

Distributor Name
Region Stock Min. Order Third party link
DIGIKEY WORLDWIDE 5506 1 Order Now
MOUSER WORLDWIDE 9239 1 Order Now
Farnell Element14 EUROPE 2460 1 Order Now

Distributor reported inventory date: 2019-07-16

Distributor Name

DIGIKEY

Stock

5506

Min.Order

1

Region

WORLDWIDE Order Now

MOUSER

Stock

9239

Min.Order

1

Region

WORLDWIDE Order Now

Farnell Element14

Stock

2460

Min.Order

1

Region

EUROPE Order Now

Distributor reported inventory date: 2019-07-16

Buy now

L6924D013TR

Package

VFQFPN 16 3x3x1.0

Packing Type

Tape And Reel

Unit Price (US$)

0.75*

Distributor availability ofL6924D013TR

Distributor Name
Region Stock Min. Order Third party link
DIGIKEY WORLDWIDE 5506 1 Order Now
MOUSER WORLDWIDE 9239 1 Order Now
Farnell Element14 EUROPE 2460 1 Order Now

Distributor reported inventory date: 2019-07-16

Distributor Name

DIGIKEY

Stock

5506

Min.Order

1

Region

WORLDWIDE Order Now

MOUSER

Stock

9239

Min.Order

1

Region

WORLDWIDE Order Now

Farnell Element14

Stock

2460

Min.Order

1

Region

EUROPE Order Now

Distributor reported inventory date: 2019-07-16

Marketing Status

Active

Unit Price (US$)

0.75

Quantity

10000

ECCN (US)

EAR99

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

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Part Number Marketing Status Package Grade RoHS Compliance Grade Material Declaration**
L6924D013TR
Active
VFQFPN 16 3x3x1.0 Industrial Ecopack2

L6924D013TR

Package:

VFQFPN 16 3x3x1.0

Material Declaration**:

PDF XML

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.