LP3913 Datasheet, PDF (1/6 Pages) Texas Instruments – Power Management IC for Flash Memory-Based Portable Media Players

ADVANCE INFORMATION
November 2006
LP3913
Power Management IC for Flash Memory Based Portable
Media Players
General Description
The LP3913 is a programmable system power management
unit that is optimized for Flash Memory based Portable Media
Players.
The LP3913 incorporates 2 low-dropout LDO voltage regula-
tors, 3 integrated Buck DC/DC converters with Dynamic Volt-
age Scaling (DVS), a 4-channel 8-bit A/D converter, and a
dual source Li-Ion/polymer battery charger. The charger has
the capability to charge and maintain a single cell battery from
a regulated wall adapter or USB power. When both USB and
adapter sources are present, then the adapter source takes
precedence and switching between USB and adapter power
sources is seamless. In addition, the battery charger supports
power routing, which allows system usage immediately after
an external power source has been detected. The LP3913
also incorporates some advanced battery management func-
tions such as battery temperature measurement, reverse cur-
rent blocking for USB, LED charger status indication,
thermally regulated internal power FETs, battery voltage
monitoring, over-current protection and a 10 hour safety
timer.
The 4-channel A/D converter measures the battery voltage
and charge current, which can be used for fuel gauging. Two
undedicated channels can be used to measure other analog
parameters such as discharge current, battery temperature,
keyboard resistor scanning and more.
The various IC parameters are programmable through a
400 kHz I²C compatible interface.
The LP3913 is available in a thermally-enhanced
6x6x0.8 mm 48 LLP package and operates over an ambient
temperature range of –40°C to +85°C.
Features
■ ^{2 low-dropout regulators -- LDO1 is used for general}
purpose applications, LDO2 is used for low-noise analog
applications. Both LDOs have programmable output
voltages.
■ ^{Green and Red LED charger status drivers}
■ ^{4-channel 8-bit dual slope a/d converter}
■ ^{3 High-efficiency DVS Buck converters}
■ ^{400 kHz I2C compatible interface}
■ ^{Linear constant-current / constant-voltage charger for}
single cell lithium-ion batteries
■ ^{USB and Adapter charging}
■ ^{System power supply management}
■ ^{6x6x0.8mm 48 LLP package}
■ ^{Voltage and thermal supervisory circuits}
■ ^{Continuous battery voltage monitoring}
■ ^{Interrupt Request output with 8 sources}
■ ^{LP3913 is pin for pin and software compatible with the}
LP3910 Hard Drive based PMIC
Key Specifications
■ ^{LDO1: 150 mA, 1.2V–3.3V}
■ ^{LDO2: 150 mA, 1.3V–3.3V}
■ ^{Buck1: 600 mA, 0.8V–2.0V}
■ ^{Buck2: 600 mA, 1.8V–3.3V}
■ ^{Buck3: 500 mA, 1.8V–3.3V}
■ ^{50 mΩ battery path resistance}
■ ^{100 mA–1000 mA full-rate charge current using wall}
adapter
■ ^{Selectable 0.05C and 0.1C EOC current}
■ ^{USB current limit of 100 mA, 500 mA, and 800 mA}
■ ^{USB pre-qual current of 50 mA}
■ ^{Selectable 4.1V, 4.2V or 4.38V battery termination}
voltages
■ ^{0.35% battery termination accuracy}
■ ^{±1 LSB INL/DNL on 8-bit a/d converter}
Applications
■ ^{Flash-based portable media players}
■ ^{Portable gaming devices}
■ ^{Portable navigation systems}
© 2006 National Semiconductor Corporation 300001
www.national.com