
ADP3808
TABLE OF CONTENTS
Features..............................................................................................1
Applications.......................................................................................1
General Description.........................................................................1
Functional Block Diagram..............................................................1
Revision History...............................................................................2
Specifications.....................................................................................3
Absolute Maximum Ratings............................................................5
ESD Caution..................................................................................5
Pin Configuration and Function Descriptions.............................6
Typical Performance Characteristics.............................................7
Theory of Operation......................................................................10
Setting the Charge Current.......................................................10
Final Battery Voltage Control...................................................11
Oscillator and PWM..................................................................11
5.25 V Bootstrap Regulator.......................................................12
Bootstrapped Synchronous Driver...........................................12
System Current Sense ................................................................12
REVISION HISTORY
6/07—Revision 0: Initial Version
Rev. 0 | Page 2 of 16
LIMIT........................................................................................... 13
AC Adaptor Detection............................................................... 13
EN................................................................................................. 13
UVLO........................................................................................... 13
Loop Feed Forward.................................................................... 13
Application Information................................................................ 14
Design Procedure....................................................................... 14
Battery Voltage Settings............................................................. 14
Inductor Selection.................................................................. 14
Output Capacitor Selection.................................................. 14
Input Capacitor Ripple.......................................................... 14
Decoupling the VCC Pin ...................................................... 14
Current Sense Filtering.......................................................... 14
MOSFET Selection................................................................. 14
Outline Dimensions....................................................................... 15
Ordering Guide .......................................................................... 15