LM3310 Datasheet, PDF (1/25 Pages) National Semiconductor (TI) – Step-up PWM DC/DC Converter with Integrated Op-Amp and Gate Pulse Modulation Switch

August 2005
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 adjust-
able output voltage and features a low R_DSON internal switch
for maximum efficiency. The operating frequency is select-
able 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
n Boost converter with a 2A, 0.18Ω switch
n Boost output voltage adjustable up to 20V
n Operating voltage range of 2.5V to 7V
n 660kHz/1.28MHz pin selectable switching frequency
n Adjustable soft-start function
n Input undervoltage protection
n Over temperature protection
n Integrated Op-Amp
n Integrated gate pulse modulation (GPM) switch
n 24-Lead LLP package
Applications
n TFT Bias Supplies
n Portable Applications
Typical Application Circuit
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