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LP3907 Datasheet, PDF (1/42 Pages) National Semiconductor (TI) – Dual High-Current Step-Down DC/DC and Dual Linear Regulator with I2C Compatible Interface | |||
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August 2007
LP3907
Dual High-Current Step-Down DC/DC and Dual Linear
Regulator with I2C Compatible Interface
General Description
The LP3907 is a multi-function, programmable Power Man-
agement Unit, optimized for low power FPGAs, microproces-
sors and DSPs. This device integrates two highly efficient 1A/
600mA step-down DC/DC converters with dynamic voltage
management (DVM), two 300mA linear regulators and a
400kHz I2C compatible interface to allow a host controller ac-
cess to the internal control registers of the LP3907. The
LP3907 additionally features programmable power-on se-
quencing and a tiny 4 x 4 x 0.8mm 24âpin LLP pin package.
Key Specifications
Step-Down DC/DC Converter (Buck)
â 1A/600mA output current
â Programmable VOUT from:
â Buck1 : 0.8Vâ2.0V @ 1A
â Buck2 : 1.0Vâ3.5V @ 600mA
â Up to 96% efficiency
â 2.1MHz PWM switching frequency
â PWM - PFM automatic mode change under low loads
â ±3% output voltage accuracy
â Automatic soft start
Features
â Compatible with advanced applications processors and
FPGAs
â 2 LDOs for powering Internal processor functions and I/Os
â High speed serial interface for independent control of
device functions and settings
â Precision internal reference
â Thermal overload protection
â Current overload protection
â 24-lead 4 Ã 4 Ã 0.8mm LLP package
â Software Programmable Regulators
â External Power-on-reset function for Buck1 and Buck2
(i.e., Power Good with delay function)
â Undervoltage lock out detector to monitor input supply
voltage
Applications
â FPGA, DSP core power
â Applications processors
â Peripheral I/O power
Linear Regulators (LDO)
â Programmable VOUT of 1.0Vâ3.5V
â ±3% output voltage accuracy
â 300mA output current
â 30mV (typ) dropout
© 2007 National Semiconductor Corporation 300178
www.national.com
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