High Efficiency Switch Mode Li-Ion Battery Charger - ON Semiconductor
Description
ADP3808A
High Efficiency Switch Mode Li-Ion Battery Charger
The ADP3808A is a complete Li-Ion battery charging controller for 3− or 4−cell battery packs.
The device combines accurate final battery charge voltage control with constant current control to simplify the implementation of constant-current, constant-voltage (CCCV) chargers.
The final battery charge voltage is programmable between 4.
0 V to 4.
5 V per cell, allowing the charging of various cell types.
The charge current is programmable over a wide range from trickle charging to full charging.
The system current sense amplifier includes an ac adapter detection output to signal that the adapter is connected.
The bootstrapped synchronous driver controls two N−channel MOSFET transistors for high efficiency charging at a low system cost.
The ADP3808A is specified over the extended commercial temperature range of 0°C to 100°C and is available in a 24−lead LFCSP package.
Features
• Selectable 3−Cell or 4−Cell Operation • Adjustable 4.
0 V to 4.
5 V Per Cell • High End-of-Charge Voltage Accuracy
♦ ±0.
4% @ 25°C ♦ ±0.
6% @ 5°C to 55°C ♦ ±0.
8% @ 0°C to 100°C
• Programmable Charge Current, Including Trickle Charge • Bootstrapped Synchronous Drive for External N−Channel MOSFETs • Programmable Oscillator Frequency • This is a Pb−Free Device
Applications
• Portable Computers • Portable Equipment
BATADJ 7 EN 8
COMP 9 AGND 10
BAT 11 CELLSEL 12
http://onsemi.
com
LFCSP24 CASE 932AG
MARKING DIAGRAM
ADP 3808A
JPZ #YYWW
xx
= Device Code
#
= Pb−Free Package
YYWW = Date Code
PIN ASSIGNMENT
24 SYSP 23 SYSM 22 VCC 21 SW 20 DRVH 19 BST
ISYS 1 LIMSET 2
LIMIT 3 EXTPWR 4
RT 5 REFIN 6
ADP3808A
TOP VIEW
(Not to Scale)
18 DRVREG 17 DRVL 16 PGND 15 CSP 14 CSM 13 CSADJ
ORDERING INFORMATION
Device*
Package Shipping†
ADP3808AJCPZ−RL LFCSP24 5000/Tape & Reel
*The “Z’ suffix indicates Pb−Free package.
†For information on tape and reel specifications,
including part orientation and tape sizes, please refer to our Tape and Reel Pac...
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