lp8765rlx National Semiconductor Corporation, lp8765rlx Datasheet - Page 2

• Manufacturer Part Number: lp8765rlx
• Description: High Performance Power Management Unit For Handset Applications
• Manufacturer: National Semiconductor Corporation

www.national.com
General Description .............................................................................................................................. 1
Features .............................................................................................................................................. 1
Applications ......................................................................................................................................... 1
General Typical Application Diagram ....................................................................................................... 3
Device Pin Diagram .............................................................................................................................. 4
Package Marking Information ................................................................................................................. 4
Ordering Information ............................................................................................................................. 4
LP8765 Pin Descriptions ........................................................................................................................ 5
Device Operation Description ................................................................................................................. 6
Support Functions ............................................................................................................................... 10
Absolute Maximum Ratings .................................................................................................................. 11
Operating Ratings
Thermal Properties ............................................................................................................................. 11
General Electrical Characteristics ......................................................................................................... 11
Linear Li-Ion Battery Charger with Single Input ....................................................................................... 13
Buck Converters ................................................................................................................................. 15
LDO's ............................................................................................................................................... 18
A/D Converter .................................................................................................................................... 21
Real-Time Clock ................................................................................................................................. 22
Backup Battery Charger ...................................................................................................................... 23
32.768 kHz Crystal Oscillator ............................................................................................................... 23
Comparators ...................................................................................................................................... 24
3 Current Sinks .................................................................................................................................. 25
I
Physical Dimensions ........................................................................................................................... 27
2
C-Compatible Serial Bus Interface ...................................................................................................... 26
OPERATION MODES .................................................................................................................... 6
POWER-ON AND POWER-OFF SEQUENCES ................................................................................. 8
REFERENCE ............................................................................................................................. 10
OSCILLATOR ............................................................................................................................. 10
REFERENCE VOLTAGE (2.5V) .................................................................................................... 10
OPERATING VOLTAGE MONITOR ............................................................................................... 10
THERMAL SHUTDOWN .............................................................................................................. 10
CHARGER FUNCTION ................................................................................................................ 13
END-OF-CHARGE (EOC) FUNCTION ........................................................................................... 13
EOC & BATTERY DEFAULT SETTING .......................................................................................... 13
HIGH-CURRENT MODE .............................................................................................................. 13
CIRCUIT OPERATION ................................................................................................................. 15
PWM OPERATION ...................................................................................................................... 15
PFM OPERATION ....................................................................................................................... 15
INTERNAL SYNCHRONOUS RECTIFICATION .............................................................................. 16
CURRENT LIMITING ................................................................................................................... 16
SOFT-START ............................................................................................................................. 16
LOW-DROPOUT OPERATION ..................................................................................................... 16
A/D CONVERTER DATA AND CONTROL REGISTERS ................................................................... 21
MEASUREMENT RESULT CALCULATION .................................................................................... 21
WORKING RANGE AND ACCURACY ........................................................................................... 21
S&H .......................................................................................................................................... 21
RTC UNLOCK FUNCTION ........................................................................................................... 22
SINK DRIVERS ........................................................................................................................... 25
INTERFACE BUS OVERVIEW ...................................................................................................... 26
DATA TRANSACTIONS ............................................................................................................... 26
START AND STOP ...................................................................................................................... 26
ACKNOWLEDGE CYCLE ............................................................................................................. 26
(Note
1,
Note
2)
......................................................................................................... 11
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