LP3925 Datasheet, PDF (2/51 Pages) Texas Instruments – High Performance Power Management Unit for Handset Applications

Table of Contents
General Description .............................................................................................................................. 1
Features .............................................................................................................................................. 1
Key Specifications ................................................................................................................................ 1
Applications ......................................................................................................................................... 1
Typical Application Diagram ................................................................................................................... 4
Pin Configuration .................................................................................................................................. 5
Package Marking Information ................................................................................................................. 6
Ordering Information ............................................................................................................................. 6
Pin Descriptions ................................................................................................................................... 7
Absolute Maximum Ratings .................................................................................................................... 9
Operating Ratings (Note 1, Note 2) ........................................................................................................... 9
General Electrical Characteristics ........................................................................................................... 9
Current Consumption .......................................................................................................................... 10
Device Operating Modes ..................................................................................................................... 11
Startup and Shutdown Sequences ........................................................................................................ 13
Enable Control ................................................................................................................................... 14
Multifunctional Pins ............................................................................................................................. 14
Single-Input Linear Charger with PMOS Routing Switch ........................................................................... 15
GENERAL CHARGER CONTROL ................................................................................................. 15
CHARGER INPUT DETECTION AND LIMITS ................................................................................. 15
SYSTEM SUPPLY FUNCTION ..................................................................................................... 15
BATTERY CHARGING FUNCTION ............................................................................................... 16
CC TO CV MODE TRANSITION ................................................................................................... 16
END-OF-CHARGE AND RESTART ............................................................................................... 16
POWER ROUTING SWITCH ........................................................................................................ 16
OPERATION WITHOUT BATTERY ............................................................................................... 16
HIGH-CURRENT MODE .............................................................................................................. 16
CHARGER ELECTRICAL CHARACTERISTICS .............................................................................. 21
Buck Information ................................................................................................................................ 22
BUCK CIRCUIT OPERATION ....................................................................................................... 22
PWM OPERATION ...................................................................................................................... 22
INTERNAL SYNCHRONOUS RECTIFICATION .............................................................................. 22
CURRENT LIMITING ................................................................................................................... 22
ECO MODE OPERATION ............................................................................................................ 22
BUCK OUTPUT VOLTAGE SELECTION ........................................................................................ 23
EXTERNAL COMPONENT SELECTION ........................................................................................ 24
DVS CONTROL .......................................................................................................................... 24
BUCK TYPICAL PERFORMANCE PLOTS ..................................................................................... 25
BUCK ELECTRICAL CHARACTERISTICS ..................................................................................... 27
LDO Information ................................................................................................................................. 28
GENERAL-TYPE “PERFECT” LDOs .............................................................................................. 28
WILO-TYPE LDOs ....................................................................................................................... 28
MICRO-PWR LDO ....................................................................................................................... 28
USB LDO ................................................................................................................................... 28
GENERAL LDO ELECTRICAL CHARACTERISTICS ....................................................................... 28
WILO-TYPE LDO ELECTRICAL CHARACTERISTICS ..................................................................... 29
MICRO-PWR LDO ELECTRICAL CHARACTERISTICS .................................................................... 30
USB LDO ELECTRICAL CHARACTERISTICS ................................................................................ 30
USB Transceiver ................................................................................................................................ 31
USB TRANSCEIVER ................................................................................................................... 31
USB CHARGER DETECTION ....................................................................................................... 31
USB CHARGER DETECTION ELECTRICAL CHARACTERISTICS .................................................... 35
USB TRANSCEIVER ELECTRICAL CHARACTERISTICS ................................................................ 35
TCXO Buffers .................................................................................................................................... 36
TCXO BUFFER ELECTRICAL CHARACTERISTICS ........................................................................ 36
Backup Battery Charger ...................................................................................................................... 37
MOMENTARY POWER LOSS ...................................................................................................... 37
32.768 kHz CRYSTAL OSCILLATOR ............................................................................................. 37
BACKUP BATTERY CHARGER ELECTRICAL CHARACTERISTICS ................................................. 37
Real Time Clock ................................................................................................................................. 38
USIM Interface ................................................................................................................................... 39
USIM LEVEL TRANSLATOR ELECTRICAL CHARACTERISTICS ..................................................... 39
FIGURE 21. SIM Interface Level Shifters ........................................................................................ 40
Comparators ...................................................................................................................................... 40
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