L5987 Datasheet | STMicroelectronics

.. 3 A step-down switching regulator Preliminary Data Features - - - - - - - - - - 3 A DC output current 2.9 V to 18 V input voltage Output voltage adjustable from 0.6 V 250 k Hz 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 VFQFPN8 3x3 mm HSOP8 exposed pad 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 ponents, the device includes an internal 250 k Hz switching frequency oscillator that can be externally adjusted up to 1 MHz. The QFN and the HSOP package with exposed pad allow reducing the Rth JA down to 60 °C/W and 40 °C/W respectively. Applications - Consumer: STB, DVD, DVD recorder, car audio, LCD TV and monitors Industrial: PLD, PLA, FPGA, chargers Networking: XDSL, modems, DC-DC modules puter: Optical storage, hard disk drive, printers, audio/graphic cards LED driving Application circuit - - - - Figure 1. August 2008 Rev 1 1/42 .st. 42 This is preliminary information on a new product now in development or undergoing evaluation. Details are subject to change without notice. .. Contents - L5987A Contents 1 Pin settings - - -...