LP8765-E Datasheet, PDF (1/5 Pages) Texas Instruments – High Performance Power Management Unit for Handset Applications

LP8765-E PRODUCT BRIEF
June 11, 2012
High Performance Power Management Unit for Handset
Applications
General Description
The LP8765 is a complete Power Management Unit (PMU)
designed for handset applications. The LP8765 PMU con-
tains a 28V Over-Voltage Protection (OVP) single-input linear
Li-Ion battery charger, backup battery charger, 10 low-
dropout voltage regulators including 4 A-type LDOs, 4 D-type
LDOs, one LILO LDO and one 28V OVP LDO, 2 high-effi-
ciency buck regulators, 2 comparators, 3 current sinks, 12-bit
ADC, real-time clock, 32 KHz OSC and one 2.5V reference
output voltage. Programming is handled via a high-speed se-
rial interface to program on/off conditions and output voltages
of individual regulators, and to read status information of the
PMU.
The LP8765 can safely charge and maintain a single cell Li-
Ion battery operating from an AC adapter or USB power
source.
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.
A built-in OVP circuit at the charger inputs protects the PMU
from input voltages up to +28V, eliminating the need for any
external protection circuitry.
Buck regulators have an automatic switch to PFM mode at
low-load conditions providing very good efficiency at low-out-
put currents.
A-type LDO regulators provide excellent PSRR and very low
noise, 10 µV typ., ideally suited for supplying voltage to RF
section.
The real-time clock/calendar provides time interval informa-
tion as well as two programmable alarms.
The current sink provides 4-bit current resolution with 6-bit
PWM dimming, up to 120 mA maximum load current.
Two general-purpose comparators can be used for detecting
external accessories like ear plugs, etc.
Notice: This document is not a datasheet. For more in-
formation regarding this product or to order samples,
please contact your local Texas Instruments sales office
or visit http://www.ti.com.
Features
■ ^{Linear Li-Ion Battery Charger with Single Input}
50 mA to 1200 mA Charging Current
4.05V to 4.75V Termination Voltage
28V OVP on the VIN_CHG Input
Charging from either AC Adaptor or USB
■ ^{Two Synchronous Magnetic Buck Regulators}
I_OUT 600 mA and 500 mA
High-efficiency PFM mode @ low I_OUT
Auto-Mode PFM/PWM Switch
Programmable Peak Switching Current Limit
Low-Inductance 2.2 µH @2 MHz Switching Frequency
3% Accurate Buck Regulators up to 90% Efficiency
■ ^LDOs
4 x A-type LDOs (3 x 200 mA, 1 x 100 mA)
4 x D-type LDOs (2 x 200 mA, 1 x 300 mA, 1 x 400 mA)
1 x LILO LDO (1 x 300 mA)
1 x 28V OVP LDO for USB Transceiver (1 x 10 mA)
10 µV noise on A-type LDOs
2% typ. Output Voltage Accuracy on LDOs
■ ^{12-bit A/D Converter}
■ ^{Three Controllable Current Sinks}
■ ^{Two Comparators}
■ ^{Interrupt Request to Reduce S/W Polling}
■ ^{32.786 KHz OSC}
■ ^{Real-Time Clock with Two Programmable Alarms}
■ ^{Thermal Shutdown with Early Warning Alarm}
■ ^{49-bump micro SMD package 3.7 x 3.7 mm, 0.5 mm pitch}
Applications
■ ^{GSM, GPRS, EDGE, CDMA & 3G Handsets}
© 2012 Texas Instruments Incorporated 301620 SNOSBA6F
www.ti.com