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L5973D Datasheet(PDF) 1 Page - STMicroelectronics |
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L5973D Datasheet(HTML) 1 Page - STMicroelectronics |
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1 / 21 page  January 2007 Rev 6 1/21 21 L5973AD 2A switch step down switching regulator General features ■ 2A Internal switch ■ Operating input voltage from 4V to 36V ■ 3.3V / (±2%) reference voltage ■ Output voltage adjustable from 1.235V to 35V ■ Low dropout operation: 100% duty cycle ■ 500KHz 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: chargers, car battery, DC-DC converters Description The L5973AD is a step down monolithic power switching regulator with a 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 high current level is also achieved thanks to an SO8 package with exposed frame, that allows to reduce the RthJA down to approximately 40°C/W. The device uses an internal P-Channel D-MOS transistor (with a typical of 200m Ω) as switching element to avoid the use of bootstrap capacitor and guarantee high efficiency. An internal oscillator fixes the switching frequency at 500KHz to minimize the size of external components. Having a minimum input voltage of 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. HSOP8 Exposed Pad www.st.com Test application circuit D03IN1453 8 4 5 1 7 L5973AD C1 10 µF 35V CERAMIC C2 330 µF 10V VOUT=3.3V VIN = 4V to 35V R1 5.6K R2 3.3K R3 4.7K C4 22nF C3 220pF 3 L1 15 µH D1 STPS340U COMP VCC OUT FB GND INH 2 6 3.3V SYNC. VREF |
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