LM2702 Datasheet | National Semiconductor

LM2702 TFT Panel Module November 2002 LM2702 TFT Panel Module General Description The LM2702 is a pact 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 170m A 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 600k Hz allowing for easy filtering and low noise. An external pensation pin gives the user flexibility in setting frequency pensation, 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 V amplifier and a Gamma buffer capable of supplying 50m A 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 600k Hz 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 V amplifier Gamma buffer 16 pin TSSOP package Applications n LCD Bias Supplies Typical Application Circuit © 2002 National Semiconductor Corporation DS200511 .national. Connection Diagram Top View 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 V+ V- V Delay Css VC FB GND SW VIN SWI SWO SWC AVIN GMA GMA+ V Amplifier positive input. V Amplifier negative input....