LM2711 Datasheet, PDF (1/20 Pages) National Semiconductor (TI) – TFT Panel Module

July 2003
LM2711
TFT Panel Module
General Description
The LM2711 is a compact bias solution for TFT displays. It
has a current mode PWM step-up DC/DC converter with a
1.4A, 0.17Ω internal switch. Capable of generating 8V at
300mA from a Lithium Ion battery, the LM2711 is ideal for
generating bias voltages for large screen LCD panels. The
LM2711 can be operated at switching frequencies of 600kHz
or 1.25MHz, allowing for easy filtering and low noise. An
external compensation pin gives the user flexibility in setting
frequency compensation, which makes possible the use of
small, low ESR ceramic capacitors at the output. The
LM2711 uses a patented internal circuitry to limit startup
inrush current of the boost switching regulator without the
use of an external softstart capacitor. An external softstart
pin enables the user to tailor the softstart to a specific
application. The LM2711 contains 4 Gamma buffers capable
of supplying 50mA source and sink. The TSSOP-20 package
ensures a low profile overall solution.
Features
n 1.4A, 0.17Ω, internal power switch
n V_IN operating range: 2.2V to 7.5V
n 600kHz/1.25MHz selectable frequency step-up DC/DC
converter
n 20 pin TSSOP package
n Inrush current limiting circuitry
n External softstart override
n 4 Gamma buffers
Applications
n LCD Bias Supplies
Typical Application Circuit
© 2003 National Semiconductor Corporation DS200468
20046831
www.national.com