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LM2735_08 Datasheet, PDF (1/42 Pages) National Semiconductor (TI) – 520kHz/1.6MHz - Space-Efficient Boost and SEPIC DC-DC Regulator | |||
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September 10, 2008
LM2735
520kHz/1.6MHz â Space-Efficient Boost and SEPIC DC-DC
Regulator
General Description
The LM2735 is an easy-to-use, space-efficient 2.1A low-side
switch regulator ideal for Boost and SEPIC DC-DC regulation.
It provides all the active functions to provide local DC/DC
conversion with fast-transient response and accurate regula-
tion in the smallest PCB area. Switching frequency is inter-
nally set to either 520kHz or 1.6MHz, allowing the use of
extremely small surface mount inductor and chip capacitors
while providing efficiencies up to 90%. Current-mode control
and internal compensation provide ease-of-use, minimal
component count, and high-performance regulation over a
wide range of operating conditions. External shutdown fea-
tures an ultra-low standby current of 80 nA ideal for portable
applications. Tiny SOT23-5, LLP-6, and eMSOP-8 packages
provide space-savings. Additional features include internal
soft-start, circuitry to reduce inrush current, pulse-by-pulse
current limit, and thermal shutdown.
Features
â Input voltage range 2.7V to 5.5V
â Output voltage range 3V to 24V
â 2.1A switch current over full temperature range
â Current-Mode control
â Logic high enable pin
â Ultra low standby current of 80 nA in shutdown
â 170 m⦠NMOS switch
â ±2% feedback voltage accuracy
â Ease-of-use, small total solution size
Internal soft-start
Internal compensation
Two switching frequencies
520 kHz (LM2735-Y)
1.6 MHz (LM2735-X)
Uses small surface mount inductors and chip capacitors
Tiny SOT23-5, LLP-6, and eMSOP-8 packages
Applications
â LCD Display Backlighting For Portable Applications
â OLED Panel Power Supply
â USB Powered Devices
â Digital Still and Video Cameras
â White LED Current Source
â Automotive
Typical Boost Application Circuit
20215801
© 2008 National Semiconductor Corporation 202158
20215815
Efficiency vs Load Current VO = 12V
www.national.com
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