LP3923_15 Datasheet, PDF (1/37 Pages) Texas Instruments – Cellular Phone Power Management Unit

LP3923
www.ti.com
SNVS567B – APRIL 2010 – REVISED MAY 2013
LP3923 Cellular Phone Power Management Unit
Check for Samples: LP3923
FEATURES
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•2 Integrated Li-Ion Battery Charger with Power
FET, Thermal Regulation and 28V OVP
• Six Low-Noise LDOs, Two LILO LDOs
– 3 x 300 mA
– 4 x 150 mA
– 1 x 80 mA
• One High Efficiency Synchronous Magnetic
Buck Regulators, I_OUT 700 mA
– High Efficiency PFM Mode @low I_OUT
– Auto Mode PFM/PWM Switch
– Low Inductance 2.2 µH @ 2 MHz Clock
• I²C-compatible Interface for Controlling LDO
Outputs and Charger Operation
• Thermal Shutdown with Early Warning Alarm
• Under-Voltage Lockout
• 30-bump 3.0 x 2.5 mm DSBGA Package
APPLICATIONS
• Cellular Handsets
KEY SPECIFICATIONS
• 50 mA to 1200 mA Charging Current
• 3.0V to 5.5V Input Voltage Range
• 135 mV typ. Dropout Voltage @ 300 mA LDOs
• 2% (typ.) Output Voltage accuracy on LDOs
• 700 mA (typ.) Buck Regulator
DESCRIPTION
The LP3923 is a fully Integrated Power Management
Unit (PMU) designed for CDMA cellular phones.
The LP3923 PMU contains a fully integrated Li-Ion
battery charger with power FET and over-voltage-
protection (OVP), one Buck regulator, 8 low-noise
low-dropout (LDO) voltage regulators, and a high-
speed serial interface to program on/off conditions
and output voltages of individual regulators, and to
read status information of the PMU. Two LILO (low-
input, low-output) type LDOs with separate power
input provide an application option for pre-regulated
high efficient power management for longer battery
life.
System Diagram
AC Adapter/
USB
I/O
Interface
of
Baseband
Processor
Li - Ion Charger
Ichg
Monitor
Serial
Interface
Control
Buck
8 x LDO
+-
BB Processor
Power Domains
Memory
RF
Peripheral
Devices
1
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2
PRODUCTION DATA information is current as of publication date.
Products conform to specifications per the terms of the Texas
Instruments standard warranty. Production processing does not
necessarily include testing of all parameters.
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