LP3918 Datasheet, PDF (1/39 Pages) National Semiconductor (TI) – Battery Charge Management and Regulator Unit

LP3918
www.ti.com
SNVS476D – AUGUST 2007 – REVISED MAY 2013
LP3918 Battery Charge Management and Regulator Unit
Check for Samples: LP3918
FEATURES
1
•2 Fully Integrated Li-Ion Battery Charger with
Thermal Regulation
• USB Charge Mode
• 7 Low Noise LDO’s
– 2 x 300 mA
– 3 x 150 mA
– 2 x 80 mA
• I2C Compatible Interface for Controlling LDO
Outputs and Charger Operation
• Thermal Shutdown
• Under Voltage Lockout
• 25-Bump Thin DSBGA Package 2.5 x 2.5 mm
• Options Available on Request, Please Contact
Sales Office for Further Information;
– Level Detect on HF_PWR & PWR_ON
– LDO Charging Mode
– Custom Default Settings on Charger, and
LDO O/P's.
APPLICATIONS
• CDMA Phone Handsets
• Low Power Wireless Handsets
• Handheld Information Appliances
• Personal Media Players
• Digital Cameras
KEY SPECIFICATIONS
• 50mA to 950mA Programmable Charge
Current
• 3.0V to 5.5V Input Voltage Range
• 200mV Typ. Dropout Voltage on 300 mA LDO’s
• 2% (Typ) Output Voltage Accuracy on LDO’s
DESCRIPTION
The LP3918 is a fully integrated charger and multi-
regulator unit designed for CDMA cellular phones.
The LP3918 contains a Li-Ion battery charger, 7 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 also to read status information from
the PMU.
The Li-Ion charger integrates a power FET, reverse
current blocking diode, sense resistor with current
monitor output, and requires only a few external
components. Charging is thermally regulated to
obtain the most efficient charging rate for a given
ambient temperature.
LDO regulators provide high PSRR and low noise
ideally suited for supplying power to both analog and
digital loads.
Functional Block Diagram
AC Adapter
Li - Ion Charger
+-
I/O
Interface
of
Baseband
Processor
Ichg
Monitor
Serial
Interface
Control
7 x LDO
BB Processor
Power Domains
Memory
RF
Peripheral
Devices
Figure 1. Simplified Functional Block Diagram
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Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.
All trademarks are the property of their respective owners.
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.
Copyright © 2007–2013, Texas Instruments Incorporated
On products compliant to MIL-PRF-38535, all parameters are
tested unless otherwise noted. On all other products, production
processing does not necessarily include testing of all parameters.