LP3907 Datasheet, PDF (1/44 Pages) National Semiconductor (TI) – 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 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. Package options include a tiny 4 x 4 x 0.8mm LLP
24–pin package and an even smaller 2.5 x 2.5mm micro SMD
25-bump package.
Key Specifications
Step-Down DC/DC Converter (Buck)
■ ^{1A/600mA output current}
■ ^{Programmable V}_OUT ^from:
— Buck1 : 0.8V–2.0V @ 1A
— Buck2 : 1.0V–3.5V @ 600mA
■ ^{Up to 96% efficiency}
■ ^{2.1MHz PWM switching frequency}
■ ^{PWM - PFM automatic mode change under low loads}
■ ^{±3% output voltage accuracy}
■ ^{Automatic soft start}
Features
■ ^{Compatible with advanced applications processors and}
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 × 4 × 0.8mm LLP or 25–bump 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
Applications
■ ^{FPGA, DSP core power}
■ ^{Applications processors}
■ ^{Peripheral I/O power}
Linear Regulators (LDO)
■ ^{Programmable V}_OUT ^{of 1.0V–3.5V}
■ ^{±3% output voltage accuracy}
■ ^{300mA output current}
■ ^{30mV (typ) dropout}
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