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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 / 17 page  January 2008 Rev 16 1/17 17 L5973D 2.5 A switch step down switching regulator Features ■ 2.5 A internal switch ■ Operating input voltage from 4 V to 36 V ■ 3.3 V / (±2%) reference voltage ■ Output voltage adjustable from 1.235 V to 35 V ■ Low dropout operation: 100 % duty cycle ■ 250 kHz 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 L5973D is a step down monolithic power switching regulator with a minimum switch current limit of 2.5 A so it is able to deliver more than 2 A DC current to the load depending on the application conditions. The output voltage can be set from 1.235 V to 35 V. The high current level is also achieved thanks to an SO8 package with exposed frame, that allows to reduce the Rth(j-amb) down to approximately 40 °C/W. The device uses an internal P-channel D-MOS transistor (with a typical Rdson of 250 m Ω) as switching element to minimize the size of the external components. An internal oscillator fixes the switching frequency at 250 kHz. Having a minimum input voltage of 4 V only, it is particularly suitable for 5 V 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 D03IN1439 8 4 5 1 7 L5973D C1 10 µF 35V CERAMIC C2 330 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 15 µH D1 STPS340U COMP VCC OUT FB GND INH 2 6 3.3V SYNC. VREF |
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