5_V_TO_4_V_CONVERTER

Published:2009/7/13 2:57:00 Author:May | From:SeekIC

Generating a 4-V supply voltage for some of the new microprocessors from a 5-V main requires a low-voltage-loss capability in an efficient switching power supply. The LTC1147L circuit shown provides this capability in only 0.6 in2 of board space. The LTC1147L is a high-efficiency step-down switching regulator controller that provides gate drive control for an external P-channel MOSFET switch. Up to 100 percent duty cycle is possible with the LTC1147L, allowing the output voltage to be close to the input voltage. This device uses a constant off-time architecture and can operate at switching frequencies eiceeding 400 kHz. The LTC1147L is an adjustable device, with the output voltage set by an external resiator divider network. Maximum load current is set by the value of the current sense resistor R2.



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