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L5987

STMicroelectronics
Part Number L5987
Manufacturer STMicroelectronics
Description 3A step-down switching regulator
Published Jul 9, 2009
Detailed Description www.DataSheet4U.com L5987 3 A step-down switching regulator Preliminary Data Features ■ ■ ■ ■ ■ ■ ■ ■ ■ ■ 3 A DC outp...
Datasheet PDF File L5987 PDF File

L5987
L5987

Overview
www.
DataSheet4U.
com L5987 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 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 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 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.
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 Application circuit ■ ■ ■ ■ Figure 1.
August 2008 Rev 1 1/42 www.
st.
com 42 This is preliminary information on a new product now in development or undergoing evaluation.
Details are subject to change without notice.
www.
DataSheet4U.
com Contents L5987 - L5987A Contents 1 Pin settings .
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4 1.
1 1.
2 Pin connection .
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4 Pin description .
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