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L7980A Datasheet(PDF) 1 Page - STMicroelectronics |
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L7980A Datasheet(HTML) 1 Page - STMicroelectronics |
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1 / 44 page  December 2010 Doc ID 15181 Rev 4 1/44 44 L7980 2 A step-down switching regulator Features ■ 2 A DC output current ■ 4.5 V to 28 V input voltage ■ Output voltage adjustable from 0.6 V ■ 250 kHz switching frequency, programmable up to 1 MHz ■ Internal soft-start and enable ■ Low dropout operation: 100% duty cycle ■ Voltage feed-forward ■ Zero load current operation ■ Overcurrent and thermal protection ■ VFQFPN3x3-8L and HSOP8 package Applications ■ Consumer: STB, DVD, DVD recorder, car audio, LCD TV and monitors ■ Industrial: PLD, PLA, FPGA, chargers ■ Networking: XDSL, modems, DC-DC modules ■ Computer: Optical storage, Hard disk drive, Printers, Audio/graphic cards ■ LED driving Description The L7980 is a step down switching regulator with 2.5 A (minimum) current limited embedded power MOSFET, so it is able to deliver up to 2 A current to the load depending on the application conditions. The input voltage can range from 4.5 V to 28 V, while the output voltage can be set starting from 0.6 V to VIN. Requiring a minimum set of external components, the device includes an internal 250 kHz switching frequency oscillator that can be externally adjusted up to 1 MHz. The QFN and the HSOP packages with exposed pad allow reducing the RthJA down to 60 °C/W and 40 °C/W respectively. Figure 1. Application circuit HSOP8 exposed pad VFQFPN8 3x3 www.st.com |
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