EL7581

Features:

·TFT/LCD display supply
- Boost regulator
-V_ON charge pump
-V_OFF charge pump
·2.7V to 14V VIN supply
·5V < V_BOOST < 17V
·5V < V_ON < 40V
·-40V < V_OFF < 0V
·V = 12V_BOOST @ 720mA
·V = 15V_BOOST @ 570mA
·High frequency, small inductor DC-DC boost circuit
·Over 90% efficient DC-DC boost converter capability
·Adjustable frequency
·Adjustable soft-start
·Adjustable outputs
·Small parts count




Application

·TFT-LCD panels
·PDAs




Pinout






Specifications

V_IN Input Voltage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .14V
V_DDB , V_DDP , V_DDN . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .18V
LX Voltage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .18V
Maximum Continuous Output Current. . . . . . . . . . . . . . . . . . . . . .1A
Storage Temperature. . . . . . . . . . . . . . . . . . . . . . . .-65 to +150
Die Junction Temperature . . . . . . . . . . . . . . . . . . . . . . . . . . . .125
Power Dissipation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . See Curves
Operating Ambient Temperature . . . . . . . . . . . . . . . .-40 to +85

Description

The EL7581 is a 3-channel DC-DC converter IC designed primarily for use in TFT-LCD applications. It features a PWM boost converter with 2.7V to 14V input capability and 5V to 17V output, which powers the column drivers and provides up to 720mA @12V, 570mA @ 15V from 5V input. A pair of charge pump control circuits provide regulated outputs of VON and VOFF supplies at 8V to 40V and -5V to -40V, respectively, each at up to 60mA. The EL7581 features adjustable switching frequency, adjustable soft start, and a separate output VON enable control to allow selection of supply start-up sequence. An over-temperature feature is provided to allow the IC to be automatically protected from excessive power dissipation. The EL7581 is available in a 20-pin HTSSOP package and is specified for operation over the full -40oC to +85oC temperature range.