Maximum mileage for mobile processors
The LP3971 power-management IC from
National Semiconductor solves the
power-supply requirements of mobile
application processors by combining six
linear regulators and three DC/DC
magnetic buck regulators in one device
that achieves ±3% output-voltage
accuracy for all channels.
Building on technology from the National LP3970,
the LP3971 targets mobile devices using Marvell,
Freescale or Samsung processors. The three onchip
buck regulators deliver high current to the
CPU and I/Os, while the six LDOs are available for
powering the real-time clock, processor
peripherals and other I/O domains. The LP3971
also provides a backup-battery charger featuring
an automatic switch for lithium-manganese coincell
batteries and supercapacitors.
The LP3971 implements an I2C interface to
enable software control of regulator functions
and settings, allowing designers to apply Dynamic
Voltage Scaling (DVS) to optimise performance
and energy efficiency.
FEATURES
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- Precision internal reference
- Integrated protection circuitry
- Programmable output voltages: 0.725V to 3.3V
- 1.6A digital outputs
- Rated LDO outputs:
30mA, 150mA, 300mA, 370mA
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APPLICATIONS
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- Handheld devices
- POS terminals
- Portable navigation systems
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