TPS5140PAGRG4 Description
To supply the voltage rails required by notebook peripheral components, the TPS5140PAGRG4 is a dc/dc controller that combines three synchronous-buck controllers and one nonsynchronous 12-V boost converter on a single chip. To drive less expensive N-channel power MOSFETs, high-side and low-side synchronous rectifier drivers are integrated on the same chip. The N channel power MOSFET is part of the nonsynchronous boost converter, which also provides 120 mA for the PCMCIA power supply. Two of the synchronous-buck controllers work 180 degrees out of phase, independently controlling the outputs, while the third controller lowers the input current ripple and permits a smaller input capacitance to minimize the cost of the power supply.
TPS5140PAGRG4 Features
High-Speed Error Amplifier
4.5 V – 28 V Input Voltage Range
Programmable Short Circuit Protection
5 V and 3.3 V LinearPWM Mode Control
Over Voltage and Under Voltage Protection
Power Good With Programmable Delay Time
Synchronous-Buck Operation for High Efficiency
Step-Down Controller Output Voltages Adjustable Down to 1.2 V
Auto PWM/SKIP Mode for High Efficiency Under All Load Conditions
Separate Standby Control and Over Current Protection for Each Channel
Three Independent Step-Down DC/DC Controllers and One 12-V Boost DC/DC Converter
TPS5140PAGRG4 Applications
Industrial
Automotive
Communications equipment
