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LM3311 Datasheet

  • LM3311

  • Step-Up PWM DC/DC Converter with Integrated LDO, Op-Amp, and...

  • 29頁

  • NSC

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LM3311 Step-Up PWM DC/DC Converter with Integrated LDO, Op-Amp, and Gate Pulse
Modulation Switch
September 2005
LM3311
Step-Up PWM DC/DC Converter with Integrated LDO,
Op-Amp, and Gate Pulse Modulation Switch
General Description
The LM3311 is a step-up DC/DC converter integrated with
an LDO, an Operational Amplifier, and a gate pulse modu-
lation switch. The boost (step-up) converter is used to gen-
erate an adjustable output voltage and features a low R
DSON
internal switch for maximum efficiency. The operating fre-
quency is selectable between 660kHz and 1.28MHz allowing
for the use of small external components. An external soft-
start pin enables the user to tailor the soft-start time to a
specific application and limit the inrush current. The LDO
also has an adjustable output voltage and is stable using
ceramic output capacitors. The Op-Amp is capable of
sourcing/sinking 135mA of current (typical). The gate pulse
modulation switch can operate with a VGH voltage of 5V to
30V. The LM3311 is available in a low profile 24-lead LLP
package.
Features
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n
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Boost converter with a 2A, 0.18鈩?switch
Boost output voltage adjustable up to 20V
Operating voltage range of 2.5V to 7V
660kHz/1.28MHz pin selectable switching frequency
Adjustable soft-start function
Input undervoltage protection
Over temperature protection
Adjustable low dropout linear regulator (LDO)
Integrated Op-Amp
Integrated gate pulse modulation (GPM) switch
24-Lead LLP package
Applications
n
TFT Bias Supplies
n
Portable Applications
Typical Application Circuit
20126331
漏 2005 National Semiconductor Corporation
DS201263
www.national.com

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