LP3913 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 I
2
C compatible interface.
The LP3913 is available in a thermally-enhanced
6x6x0.8 mm 48 LLP package and operates over an ambient
temperature range of 鈥?0擄C to +85擄C.
Features
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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 I
2
C 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
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Key Specifications
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LDO1: 150 mA, 1.2V鈥?.3V
LDO2: 150 mA, 1.3V鈥?.3V
Buck1: 600 mA, 0.8V鈥?.0V
Buck2: 600 mA, 1.8V鈥?.3V
Buck3: 500 mA, 1.8V鈥?.3V
50 m鈩?battery path resistance
100 mA鈥?000 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
鹵1 LSB INL/DNL on 8-bit a/d converter
Applications
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Flash-based portable media players
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Portable gaming devices
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Portable navigation systems
漏 2006 National Semiconductor Corporation
300001
www.national.com
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