EL7586A

TFT-LCD Power Supply

Product Status: Mass Production

OVERVIEW

The EL7586 and EL7586A represent multiple output regulators for use in all large panel, TFT-LCD applications. Both feature a single boost converter with an integrated 2A FET, two positive LDOs for VON and VLOGIC generation, and a single negative LDO for VOFF generation. The boost converter can be programmed to operate in either P-mode or PI-mode for improved load regulation.

Both EL7586 and EL7586A also integrate fault protection for all four channels. Once a fault is detected, the device is latched off until the input supply or EN is cycled. EL7586 also features an integrated start-up sequence for VBOOST /VLOGIC , VOFF , then VON or for VLOGIC , VOFF , VBOOST , and VON . The latter requires a single external transistor. The timing of the start-up sequence is set using an external capacitor.

EL7586A features an immediately-enabled VLOGIC output which is independent of EN input. The VLOGIC output will be switched off if a fault is detected and the power supply needs to be recycled to reset this condition.

Both the EL7586 and EL7586A are pin-compatible, come in the 20 Ld 4x4 QFN package, and are specified for operation over the -40°C to +85°C temperature range.

KEY FEATURES

  • 2A current limit FET options
  • 3V to 5V input
  • Up to 20V boost out
  • 1% regulation on all outputs
  • VLOGIC-VOFF-VBOOST-VON or VBOOST/VLOGIC-VOFF-VON sequence control
  • VLOGIC is on from start-up for EL7586A
  • Programmable sequence delay
  • Fully fault protected
  • Thermal shutdown
  • Internal soft-start
  • 20 Ld 4x4 QFN packages
  • Pb-free plus anneal available (RoHS compliant)

BLOCK DIAGRAM

 Block Diagram

PARAMETRICS

Parameters
EL7586A
Basic Information
Production Status
Mass Production
Input Voltage Min (V)
3
Input Voltage Max (V)
5.5
VBOOST (min) (V)
5.5
VBOOST (max) (V)
20
Boost Current Limit (A)
2
On Voltage Min (V)
5
On Voltage Max (V)
32
Off Voltage Min (V)
-15
Qualification Level
Standard
Logic Voltage Min (V)
1.2
Logic Voltage Max (V)
3.3
# of VCOM
N/A
# of Gamma
N/A
Features
Start-up sequencing (exc. VLOGIC), fault protection
VBOOST (V)
5.5 to 20
Input Voltage Range (V)
3 to 5.5
VLOGIC (V)
1.2 to 3.3
VOFF/VN (V)
-15 to 0
On Voltage Range (V)
5 to 32
Temperature Range
-40 to +85

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