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
2 High-efficiency DVS Buck converters
Wide load range Buck-Boost DC/DC converter
400 kHz I
2C-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-pin LLP package
Voltage and thermal supervisory circuits
Continuous battery voltage monitoring
Interrupt Request output with 8 sources
Description The LP3910 is a programmable system power management unit that is optimized for HDD-based Portable Media Players.
The LP3910 incorporates 2 low-dropout LDO voltage regulators, 2 integrated Buck DC/DC converters with Dynamic Voltage Scaling
(DVS), 1 wide load range Buck-Boost DC/DC converter with programmable output voltage, 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 LP3910 also incorporates some
advanced battery management functions such as battery temperature measurement, reverse current 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 Buck-Boost DC/DC converter targets the power management of Hard Disk Drives and maintains a typical operating voltage
of 3.3V ±5% with a battery voltage below or above this output level. The Buck-Boost output voltage can be selected to be as
low as 1.8V.
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
2C-compatible interface.
The LP3910 is available in a thermally-enhanced
6x6x0.8 mm 48-pin LLP package and operates over an ambient temperature range of –40°C to +85°C.
Key Specification
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
BUCK-Boost: 1000 mA, 1.8V–3.3V
50 mΩ battery path resistance
100 mA to 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
Hard drive-based media players
Portable gaming players
Portable navigation devices
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Also Recommended
| LP3913▲ | For Flash Based Media Players |
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Apps diagram
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LP3913
