LP3906 Datasheet | National Semiconductor

Description The LP3906 is a multi-function, programmable Power Management Unit, optimized for low power FPGAs, Microprocessors and DSPs. This device integrates two highly efficient 1.5A Step-Down DC/DC converters with dynamic voltage management (DVM), two 300m A Linear Regulators and a 400k Hz I2C patible interface to allow a host controller access to the internal control registers of the LP3906. The LP3906 additionally features programmable power-on sequencing and is offered in a tiny 5 x 4 x 0.8mm LLP-24 pin package. Features n patible 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: - 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 VOUT of 1.0V- 3.5V n ± 3% output voltage accuracy n 300 m A output currents n 25 m V (typ) Dropout Applications n FPGA, DSP core power n Applications processors n Peripheral I/O power © 2006 National Semiconductor Corporation DS201978 .national. .. Typical Application Circuit FIGURE 1. Typical Application Circuit .national. .. (Continued) - For information about how schottky diodes can reduce noise in high load, high Vin applications, refer to "Buck Output Ripple Management" in the Application Notes section. FIGURE 2. Typical Application Circuit .national. .. Connection Diagram - Refer to Package Marking in Ordering Information Table Below FIGURE 3. 24-Lead LLP Package (Top View) Note: The physical placement of the package...