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LP3906 Datasheet

  • LP3906

  • Dual High-Current Step-Down DC/DC and Dual Linear Regulator ...

  • 38頁

  • NSC

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LP3906 Dual High-Current Step-Down DC/DC and Dual Linear Regulator with I2C Compatible
Interface
September 2006
LP3906
Dual High-Current Step-Down DC/DC and Dual Linear
Regulator with I2C Compatible Interface
General Description
The LP3906 is a multi-function, programmable Power Man-
agement Unit, optimized for low power FPGAs, Microproces-
sors and DSPs. This device integrates two highly efficient
1.5A 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
access to the internal control registers of the LP3906. The
LP3906 additionally features programmable power-on se-
quencing and is offered in a tiny 5 x 4 x 0.8mm LLP-24 pin
package.
Features
n
Compatible with advanced applications processors and
FPGAs
n
2 LDOs for powering Internal processor functions and
I/Os
n
High speed serial interface for independent control of
device functions and settings
n
Precision internal reference
n
Thermal overload protection
n
Current overload protection
n
24-lead 5 x 4 x 0.8 mm LLP package
n
Software Programmable Regulators
Key Specifications
Step-Down DC/DC Converter (Buck)
n
1.5A output current
n
Programmable Vout from:
鈥?Buck1 : 0.8V鈥?.0V
鈥?Buck2 : 1.0V鈥?.5V
n
Up to 96% efficiency
n
2 MHz PWM switching frequency
n
鹵
3% output voltage accuracy
n
Automatic soft start
Linear Regulators (LDO)
n
Programmable V
OUT
of 1.0V鈥?.5V
n
鹵
3% output voltage accuracy
n
300 mA output currents
n
25 mV (typ) Dropout
Applications
n
FPGA, DSP core power
n
Applications processors
n
Peripheral I/O power
漏 2006 National Semiconductor Corporation
DS201978
www.national.com

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