LP3906 Datasheet, PDF (1/38 Pages) National Semiconductor (TI) – 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.
Key Specifications
Step-Down DC/DC Converter (Buck)
n 1.5A output current
n Programmable Vout from:
— Buck1 : 0.8V–2.0V
— Buck2 : 1.0V–3.5V
n Up to 96% efficiency
n 2 MHz PWM switching frequency
n ±3% output voltage accuracy
n Automatic soft start
Linear Regulators (LDO)
n Programmable V_OUT of 1.0V–3.5V
n ±3% output voltage accuracy
n 300 mA output currents
n 25 mV (typ) Dropout
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
Applications
n FPGA, DSP core power
n Applications processors
n Peripheral I/O power
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