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LM2702

National Semiconductor
Part Number LM2702
Manufacturer National Semiconductor
Description TFT Panel Module
Published Mar 22, 2005
Detailed Description LM2702 TFT Panel Module November 2002 LM2702 TFT Panel Module General Description The LM2702 is a compact bias solutio...
Datasheet PDF File LM2702 PDF File

LM2702
LM2702

Overview
LM2702 TFT Panel Module November 2002 LM2702 TFT Panel Module General Description The LM2702 is a compact bias solution for TFT displays.
It has a current mode PWM step-up DC/DC converter with a 2A, 0.
2Ω internal switch.
Capable of generating 8V at 170mA from a Lithium Ion battery, the LM2702 is ideal for generating bias voltages for large screen LCD panels.
The LM2702 operates at a switching frequency of 600kHz 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 LM2702 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 LM2702 has an internal controllable PMOS switch used for controlling the row driver voltages.
The switch can be controlled externally with a control pin and delay time.
The LM2702 contains a Vcom amplifier and a Gamma buffer capable of supplying 50mA source and sink.
The TSSOP-16 package ensures a low profile overall solution.
Features n n n n n n n n n n n 2A, 0.
2Ω, internal power switch VIN operating range: 2.
2V to 12V 600kHz switching frequency step-up DC/DC converter Inrush current limiting circuitry External softstart override Internal 7.
3Ω PMOS switch PMOS switch control pin PMOS switch delay pin Vcom amplifier Gamma buffer 16 pin TSSOP package Applications n LCD Bias Supplies Typical Application Circuit 20051131 © 2002 National Semiconductor Corporation DS200511 www.
national.
com LM2702 Connection Diagram Top View 20051104 TJMAX TSSOP 16 package = 125˚C, θJA = 120˚C/W (Note 1) Pin Description Pin 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 Name Vcom+ Vcom− Vcom Delay Css VC FB GND SW VIN SWI SWO SWC AVIN GMA GMA+ Vcom Amplifier positive input.
Vcom Amplifier negative input.
V...


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