View L6924D_392135.PDF datasheet online --- IC-ON-LINE

Datasheet File OCR Text:

L6924D
Li-Ion/Li-Polymer Battery Charger System with Integrated Power Switch
DATA BRIEF
Features
Fully integrated solution with Power pass 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 Programmable charge current Programmable Pre-Charge voltage threshold 1% output voltage accuracy Status outputs to drive LEDs or Host Processor interface Programmable charge timer and charge end current Small VFQFPN package (3mm x 3mm) Low thermal resistance: 80C/W Charge current thermal loop
VFQFPN 16

Description
The L6924D is a fully monolithic linear battery charger, ideal for coke and graphite anode single cell Li-Ion packs that allows a charge management system in a very compact application. It is the ideal way for space limited applications, like PDA's, hand held, cellular phones and digital cameras. It is realized in BCD6 technology and, in a small VFQFPN 3x3 16 pins package, that integrates all the power elements (the Power pass MOSFET, the reverse blocking diode and the sense resistor). The maximum application flexibility of the L6924D, is given by the possibility of programming all the features (like pre-charging current, charging current, the pre-charging voltage threshold, the end of charge current threshold and the charging time). When a real basic external wall adapter is used, the L6924D works in Linear Mode and charges the battery in a CC/CV (Constant current/ Constant voltage) profile.
Applications

PDA's Handheld Devices Cellular Phones Digital Cameras Stand-alone Chargers Usb Powered Chargers Mp3 Players
Order codes
Part number L6924D Package VFQFPN 16 Packing Tube
July 2005
CD00061067
Rev 1 1/5
www.st.com
5
For further information contact your local STMicroelectronics sales office.
L6924D
However, when a current-limited adapter is used, the device works in Quasi Pulse Mode thanks to its low input voltage. The device has an operating input voltage ranging from 2.5V to 14V. On the L6924D is possible to select the output voltage (4.1V-4.2V) with 1% voltage accuracy. This allows to use both coke and graphite anode cells. The L6924D offers two open collector outputs, for diagnostic purpose, which can be used to drive two external LEDs, or to communicate with a host microcontroller. Moreover, the voltage across the resistor connected between IEND and GND gives the status about the charging current (working as a gas gauge) and some eventual faults, like battery over temperature, the battery absence and the over time charge. Figure 1. Basic Application Diagram
R3 NTC
CHARGER
VIN VINSNS TPRG
VREF
TH
VOUT VOSNS IEND
BATTERY Li-Ion cell
C1
C2
C3
L6924D
IPRG VPRE
ST1 ST2 ON OFF SHDN GND
IPRE VOPRG
Figure 2.
Demo Board Layout
2/5
CD00061067
L6924D
1 Package information
1
Figure 3.
Package information
VFQFPN 16 (3mmx3mm) Mechanical Data & Package Dimensions
mm DIM. MIN. A A1 A2 A3 b D D2 E E2 e L ddd 0.180 2.875 0.250 2.875 0.250 0.450 0.300 0.800 TYP. 0.900 0.020 0.650 0.250 0.230 3.000 0.700 3.000 0.700 0.500 0.400 0.300 3.125 1.250 3.125 1.250 0.550 0.500 0.080 0.007 0.113 0.010 0.113 0.010 0.018 0.012 MAX. 1.000 0.050 1.000 MIN. 0.031 TYP. 0.035 MAX. 0.039 inch
OUTLINE AND MECHANICAL DATA
0.0008 0.0019 0.025 0.01 0.009 0.118 0.027 0.118 0.027 0.020 0.016 0.012 0.123 0.050 0.123 0.050 0.022 0.020 0.003 0.039
VFQFPN-16 (3x3x1.0mm) Very Fine Quad Flat Package No lead
7185330 D
CD00061067
3/5
2 Revision history
L6924D
2
Revision history
Date 12-July-2005 Revision 1 Initial release. Changes
4/5
CD00061067
L6924D
Information furnished is believed to be accurate and reliable. However, STMicroelectronics assumes no responsibility for the consequences of use of such information nor for any infringement of patents or other rights of third parties which may result from its use. No license is granted by implication or otherwise under any patent or patent rights of STMicroelectronics. Specifications mentioned in this publication are subject to change without notice. This publication supersedes and replaces all information previously supplied. STMicroelectronics products are not authorized for use as critical components in life support devices or systems without express written approval of STMicroelectronics. The ST logo is a registered trademark of STMicroelectronics. All other names are the property of their respective owners (c) 2005 STMicroelectronics - All rights reserved STMicroelectronics group of companies Australia - Belgium - Brazil - Canada - China - Czech Republic - Finland - France - Germany - Hong Kong - India - Israel - Italy - Japan Malaysia - Malta - Morocco - Singapore - Spain - Sweden - Switzerland - United Kingdom - United States of America www.st.com
CD00061067
5/5

▲Up To Search▲

Price & Availability of L6924D

	To Download L6924D Datasheet File
If you can't view the Datasheet, Please click here to try to view without PDF Reader .