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LP3925RME-E/NOPB

更新时间： 2024-11-15 11:58:07
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High Performance Power Management Unit for Handset Applications

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April 12, 2012  
LP3925  
High Performance Power Management Unit for Handset  
Applications  
General Description  
Features  
The LP3925 is designed to meet the power management re-  
quirements of the latest 3G/GSM/GPRS/EDGE cellular  
phones. The LP3925 PMU contains a single-input Li-Ion bat-  
tery charger, 14 low-dropout voltage regulators including 3  
wide-input, low-output, regulators, 3 buck regulators, a USB  
Transceiver, two comparators, two TCXO buffers, SIM level  
shifter, 12-bit ADC, real time clock, and backup battery charg-  
er. Programming is handled via an I2C-compatible high-speed  
Serial Interface allowing control of program on/off conditions  
and the output voltages of individual regulators, and to read  
status information of the PMU.  
Linear charger with single input  
■
USB or AC adapter input  
Power routing switch  
—
—
—
28V OVP on the charger input  
Three high-efficiency Synchronous Magnetic Buck  
Regulators, IOUT 800 mA each:  
■
■
2 regulators have DVS support  
High-efficiency ECO mode @ low IOUT  
Auto Mode ECO/PWM switch  
28V OVP on the charger input  
—
—
—
—
It can charge and maintain a single cell Li-Ion battery operat-  
ing from an AC adapter or USB power source.  
15 LDOs  
10 General-type Low-Noise LDOs  
8 x 300 mA  
2 x 80 mA  
—
The Li-Ion charger requires few external components and in-  
tegrates the power FET. Charging is thermally regulated to  
obtain the most efficient charging rate for a given ambient  
temperature.  
Three wide-input low-output (WILO) LDOs, all capable  
of supplying up to 300 mA  
—
A built-in Over-Voltage Protection (OVP) circuit at the charger  
input protects the PMU from input voltages up to +28V elim-  
inating the need for any external protection circuitry.  
1 micro-power LDO with IOUT 30 mA  
1 high-voltage USB LDO  
—
—
—
—
S/W controllable outputs  
Buck regulators have an automatic switch to ECO mode at  
low load conditions providing very good efficiency at low out-  
put currents.  
Outputs configurable for pulldown  
Two Comparators and Two TCXO Buffers  
■
■
■
Buck regulators have an automatic switch to ECO mode at  
low load conditions providing very good efficiency at low out-  
put currents.  
USB 2.0-compatible Transceiver (12 Mb/s)  
12-bit A/D Converter for battery management and external  
monitoring  
General-type “PERFECT” LDO regulators provide excellent  
PSRR and ULTRA LOW NOISE, 10 µV typ., ideally suited for  
supplying voltage to RF section.  
Two over-voltage protected outputs for USB transceivers  
Real time clock with two alarms  
■
■
■
■
■
■
■
■
■
SIM card level translator  
The real-time clock/calendar provides time interval informa-  
tion as well as two programmable alarms.  
Three controllable current sinks for Keypad LEDs  
Backup battery charger  
To accommodate different baseband requirements, the  
LP3925 PMU has different default voltage settings and start-  
up sequences. Two general-purpose comparators can be  
used for detecting external accessories like ear-phones etc.  
Power conversion and signal level shifting circuits are pro-  
vided to allow SIM interfacing.  
Thermal Shutdown with Early Warning Alarm  
Momentary Power Loss detection  
Interrupt Request to reduce S/W polling  
81-bump micro SMDxt package  
Key Specifications  
LOW PMU IQ in sleep mode  
■
■
■
■
■
■
50 mA to 1200 mA Charging Current from AC Adapter  
3.0V to 4.5V Battery Voltage  
150 mV typ. Dropout Voltage on LDOs @ 300 mA  
2% typ. Output Voltage accuracy on LDOs  
ULTRA LOW NOISE (10 µV typ.), ULTRA LOW IQ, remote  
capacitor General-type “PERFECT” LDOs  
3% accurate Buck regulators up to 90% efficient  
■
Applications  
GSM, GPRS, EDGE, CDMA & 3G Handsets  
■
© 2012 Texas Instruments Incorporated  
301204 SNVS672B  
www.ti.com  
 
 
 
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