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LP3907SQX-PXPP Datasheet

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LP3907 Dual High-Current Step-Down DC/DC and Dual Linear Regulator with I2C Compatible
Interface
December 12, 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 I
2
C 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. Package options include a tiny 4 x 4 x 0.8mm LLP
24鈥損in package and an even smaller 2.5 x 2.5mm micro SMD
25-bump package.
Features
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Compatible with advanced applications processors and
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FPGAs
2 LDOs for powering Internal processor functions and I/Os
High speed serial interface for independent control of
device functions and settings
Precision internal reference
Thermal overload protection
Current overload protection
24-lead 4 脳 4 脳 0.8mm LLP or 25鈥揵ump 2.5 x 2.5mm micro
SMD package
Software Programmable Regulators
External Power-on-reset function for Buck1 and Buck2
(i.e., Power Good with delay function)
Undervoltage lock out detector to monitor input supply
voltage
Key Specifications
Step-Down DC/DC Converter (Buck)
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1A/600mA output current
鈻?/div>
Programmable V
OUT
from:
鈥?/div>
Buck1 : 0.8V鈥?.0V @ 1A
鈥?/div>
Buck2 : 1.0V鈥?.5V @ 600mA
鈻?/div>
Up to 96% efficiency
鈻?/div>
2.1MHz PWM switching frequency
鈻?/div>
PWM - PFM automatic mode change under low loads
鈻?/div>
鹵3% output voltage accuracy
鈻?/div>
Automatic soft start
Linear Regulators (LDO)
鈻?/div>
Programmable V
OUT
of 1.0V鈥?.5V
鈻?/div>
鹵3% output voltage accuracy
鈻?/div>
300mA output current
鈻?/div>
30mV (typ) dropout
Applications
鈻?/div>
FPGA, DSP core power
鈻?/div>
Applications processors
鈻?/div>
Peripheral I/O power
漏 2007 National Semiconductor Corporation
300178
www.national.com

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