LM3310_07 Datasheet, PDF (1/26 Pages) National Semiconductor (TI) – Step-Up PWM DC/DC Converter with Integrated Op-Amp and Gate Pulse Modulation Switch

November 26, 2007
LM3310
Step-Up PWM DC/DC Converter with Integrated Op-Amp
and Gate Pulse Modulation Switch
General Description
The LM3310 is a step-up DC/DC converter integrated with an
Operational Amplifier and a gate pulse modulation switch.
The boost (step-up) converter is used to generate an ad-
justable output voltage and features a low R_DSON internal
switch for maximum efficiency. The operating frequency is
selectable between 660kHz and 1.28MHz allowing for the use
of small external components. An external soft-start pin en-
ables the user to tailor the soft-start time to a specific appli-
cation and limit the inrush current. 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 LM3310 is available in a low profile 24-lead LLP
package.
Features
■ ^{Boost converter with a 2A, 0.18Ω 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}
■ ^{Integrated Op-Amp}
■ ^{Integrated gate pulse modulation (GPM) switch}
■ ^{24-Lead LLP package}
Applications
■ ^{TFT Bias Supplies}
■ ^{Portable Applications}
Typical Application Circuit
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