LP3907 Datasheet | National Semiconductor

Description The LP3907 is a multi-function, programmable Power Management Unit, optimized for low power FPGAs, microprocessors and DSPs. This device integrates two highly efficient 1A/ 600m A 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 LP3907. The LP3907 additionally features programmable power-on sequencing and a tiny 4 x 4 x 0.8mm 24- pin LLP pin package. Features - patible 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 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) - 1A/600m A output current - Programmable VOUT from: - Buck1 : 0.8V- 2.0V @ 1A - Buck2 : 1.0V- 3.5V @ 600m A - Up to 96% efficiency - 2.1MHz PWM switching frequency - PWM - PFM automatic mode change under low loads - ±3% output voltage accuracy - Automatic soft start Linear Regulators (LDO) - Programmable VOUT of 1.0V- 3.5V - ±3% output voltage accuracy - 300m A output current .. - 30m V (typ) dropout - - - - - - Applications - FPGA, DSP core power - Applications processors - Peripheral I/O power © 2007 National Semiconductor Corporation .national. Typical Application Circuit FIGURE 1. Application Circuit .. .national. .....