EL7583

3-Channel DC/DC Converter

OVERVIEW

The EL7583 is a 3-channel DC/DC converter IC which is 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 470mA @ 12V, 370mA @ 15V from 5V supply. 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 EL7583 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 EL7583 is available in a standard 20 Ld TSSOP package and the Pb-free 20 Ld HTSSOP package. Both are specified for operation over the full -40°C to +85°C temperature range.

KEY FEATURES

  • TFT-LCD display supply
  • Boost regulator
  • VON charge pump
  • VOFF charge pump
  • 2.7V to 14V VIN supply
  • 5V < VBOOST < 17V
  • 5V < VON < 40V
  • -40V < VOFF < 0V
  • VBOOST = 12V @ 470mA
  • VBOOST = 15V @ 370mA
  • 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
  • Pb-free plus anneal available (RoHS compliant)

BLOCK DIAGRAM

 Block Diagram

PARAMETRICS

Parameters
EL7583
Basic Information
Production Status
Mass Production
Input Voltage Min (V)
2.7
Input Voltage Max (V)
14
VBOOST (min) (V)
5
VBOOST (max) (V)
17
Boost Current Limit (A)
1.75
On Voltage Min (V)
5
On Voltage Max (V)
40
Off Voltage Min (V)
-40
Qualification Level
Standard
Logic Voltage Min (V)
N/A
Logic Voltage Max (V)
N/A
# of VCOM
N/A
# of Gamma
N/A
Features
Adjustable frequency, adjustable soft-start
VBOOST (V)
5 to 17
Input Voltage Range (V)
2.7 to 14
VLOGIC (V)
N/A
VOFF/VN (V)
-40 to 0
On Voltage Range (V)
5 to 40
Can Sample
YES
Temperature Range
-40 to +85

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