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
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.
