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LM1770TMFX Datasheet

  • LM1770TMFX

  • SOT-23 Synchronous Buck Controller

  • 14頁

  • NSC

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LM1770 SOT-23 Synchronous Buck Controller
September 2005
LM1770
SOT-23 Synchronous Buck Controller
General Description
The LM1770 is an efficient synchronous buck switching con-
troller in a tiny SOT23 package. The constant on-time control
scheme provides a simple design free of compensation com-
ponents, allowing minimal component count and board
space. It also incorporates a unique input feed-forward to
maintain a constant frequency independent of the input volt-
age. The LM1770 is optimized for a low voltage input range
of 2.8V to 5.5V and can provide an adjustable output as low
as 0.8V. Driving an external high side PFET and low side
NFET it can provide efficiencies as high as 95%.
Three versions of the LM1770 are available depending on
the switching frequency desired for the application. Nominal
switching frequencies are in the range of 100kHz to
1000kHz.
Features
n
n
n
n
n
n
n
n
Input voltage range of 2.8V to 5.5V
0.8V reference voltage
No compensation required
Constant frequency across input range
Low quiescent current of 400碌A
Internal soft-start
Short circuit protection
Tiny SOT-23 package
Applications
n
Simple To Design, High Efficiency Step Down Switching
Regulators
n
Set-Top Boxes
n
Cable Modems
n
Printers
n
Digital Video Recorders
n
Servers
Typical Application Circuit
20166201
漏 2005 National Semiconductor Corporation
DS201662
www.national.com

LM1770TMFX 產(chǎn)品屬性

  • National Semiconductor (TI)

  • 2.8 V to 5.5 V

  • 0.8 V to 4.5 V

  • 4 A

  • 1

  • + 125 C

  • SMD/SMT

  • SOT-23

  • - 40 C

  • Reel

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