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L7981A Datasheet(PDF) 1 Page - STMicroelectronics

No. de pieza L7981A
Descripción Electrónicos  3 A step-down switching regulator
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Fabricante Electrónico  STMICROELECTRONICS [STMicroelectronics]
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L7981A Datasheet(HTML) 1 Page - STMicroelectronics

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July 2010
Doc ID 15182 Rev 3
1/44
44
L7981
3 A step-down switching regulator
Features
3 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
Suitable for LED driving
Description
The L7981 is a step down switching regulator with
3.7 A (minimum) current limited embedded power
MOSFET, so it si able to deliver up to 3 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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