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E-L5970D Datasheet(PDF) 1 Page - STMicroelectronics |
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E-L5970D Datasheet(HTML) 1 Page - STMicroelectronics |
1 / 16 page October 2007 Rev 16 1/16 16 L5970D Up to 1A step down switching regulator Features ■ Up to 1A output current ■ Operating input voltage from 4.4V to 36V ■ 3.3V / (±2%) reference voltage ■ Output voltage adjustable from 1.2V to 35V ■ Low dropout operation: 100% duty cycle ■ 250KHz Internally fixed frequency ■ Voltage feedforward ■ Zero load current operation ■ Internal current limiting ■ Inhibit for zero current consumption ■ Synchronization ■ 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 L5970D is a step down monolithic power switching regulator capable to deliver up to 1A at output voltages from 1.2V 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 D98IN954C 8 2 4 5 1 7 L5970D 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 6 D1 STPS2L40U 3.3V INH. SYNC. COMP VCC VREF OUT FB GND L1 33 µH |
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