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L5972D Datasheet(PDF) 1 Page - STMicroelectronics |
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L5972D Datasheet(HTML) 1 Page - STMicroelectronics |
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1 / 15 page  October 2007 Rev 10 1/15 15 L5972D 2A switch step down switching regulator Features ■ 2A internal switch ■ Operating input voltage from 4.4V to 36V ■ Output voltage adjustable from 1.235V to 35V ■ Low dropout operation: 100% duty cycle ■ 250kHz Internally fixed frequency ■ Voltage feedforward ■ Zero load current operation ■ Internal current limiting ■ Protection against feedback disconnection ■ Thermal shutdown Applications ■ Consumer: STB, DVD, TV, VCR, car radio, LCD monitors ■ Networking: XDSL, modems, DC-DC modules ■ Computer: printers, audio/graphic cards, optical storage, hard disk drive ■ Industrial: changers, car battery, DC-DC converters Figure 1. Test application circuit Description The L5972D is a step down monolithic power switching regulator with a minimum switch current limit of 2A so it is able to deliver more than 1.5A DC current to the load depending on the application conditions. The output voltage can be set from 1.235V to 35V. The device uses an internal P-Channel D-MOS transistor (with a typical Rdson of 250m Ω) as switching element to minimize the size of the external components. An internal oscillator fixes the switching frequency at 250kHz. Having a minimum input voltage of 4.4V only, it is particularly suitable for 5V bus, available in all computer related applications. Pulse by pulse current limit with the internal frequency modulation offers an effective constant current short circuit protection. SO8 www.st.com D03IN1436 8 2 4 5 1 7 L5972D C1 10 µF 35V CERAMIC C2 100 µF 10V VOUT=3.3V VIN = 4.4V to 35V R1 5.6K R2 3.3K R3 4.7K C4 22nF C3 220pF 3 L1 33 µH 6 D1 STPS2L40U COMP VCC OUT FB GND |
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