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L5987TR Datasheet(PDF) 1 Page - STMicroelectronics |
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L5987TR Datasheet(HTML) 1 Page - STMicroelectronics |
1 / 42 page Preliminary Data This is preliminary information on a new product now in development or undergoing evaluation. Details are subject to change without notice. August 2008 Rev 1 1/42 42 L5987 3 A step-down switching regulator Features ■ 3 A DC output current ■ 2.9 V to 18 V input voltage ■ Output voltage adjustable from 0.6 V ■ 250 kHz switching frequency, programmable up to 1 MHz ■ Internal soft-start and inhibit ■ Low dropout operation: 100 % duty cycle ■ Voltage feed-forward ■ Zero load current operation ■ Over current 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 L5987 is a step down switching regulator with 3.5 A (minimum) current limited embedded power MOSFET, so it is able to deliver up to 3 A current to the load depending on the application conditionals Section 5.7 and Section 5.8). The input voltage can range from 2.9 V to 18 V, while the output voltage can be set starting from 0.6 V to VIN. Having a minimum input voltage of 2.9 V, the device is suitable also for 3.3 V bus. 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 package with exposed pad allow reducing the RthJA down to 60 °C/W and 40 °C/W respectively. HSOP8 exposed pad VFQFPN8 3x3 mm www.st.com Figure 1. Application circuit |
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