The LP3907 is a multi-function, programmable power management unit (PMU) optimized for low-power FPGAs, microprocessors, and DSPs. This device integrates two highly efficient 1-A, 600-mA step-down DC-DC converters with dynamic voltage scaling (DVS), two 300-mA linear regulators, and a 400-kHz I2C interface to allow a host controller access to the internal control registers of the device. The LP3907 additionally features programmable power-on sequencing.
Features include programmable power-on sequencing, communication control (I2C), dynamic voltage scaling, overcurrent protection, Power Good, synchronous rectification, thermal shutdown, and undervoltage lockout. For applications requiring light loads, the high-efficiency synchronous switching buck regulators enter PFM mode and operate with reduced switching frequency and supply current to maintain high efficiency at very light loads.
For all available packages, see the orderable addendum at the end of the data sheet.
Input Voltage Range: 2.8 V to 5.5 V
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
Software Programmable Regulators
External Power-On-Reset Function for Buck1 and Buck2 (Power Good with Delay Function)
Undervoltage Lockout Detector to Monitor Input Supply Voltage
Programmable VOUT from:
Buck1 : 0.8 V–2 V at 1 A
Buck2 : 1 V–3.5 V at 600 mA
Up to 96% Efficiency
2.1-MHz PWM Switching Frequency
PWM-to-PFM Automatic Mode Change
Under Low Loads
±3% Output Voltage Accuracy
Automatic Soft Start
Programmable VOUT of 1 V to 3.5 V
(except , , and options)
