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EL7583 Datasheet

3-Channel DC-DC Converter

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®
Data Sheet
July 24, 2003
EL7583
FN7335.2
3-Channel DC-DC Converter
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 20-pin TSSOP package and is
specified for operation over the full -40°C to +85°C
temperature range.
Ordering Information
PART
NUMBER
EL7583IR
EL7583IR-T7
EL7583IR-T13
PACKAGE
20-Pin TSSOP
20-Pin TSSOP
20-Pin TSSOP
TAPE &
REEL
-
7”
13”
PKG. DWG. #
MDP0044
MDP0044
MDP0044
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
Applications
• TFT-LCD panels
• PDAs
Pinout
EL7583
(20-PIN TSSOP)
TOP VIEW
VSSB 1
SS 2
FBB 3
VDDB 4
LX 5
LX 6
LX 7
DRVN 8
VDDN 9
FBN 10
20 ROSC
19 ENP
18 ENBN
17 VREF
16 PGND
15 PGND
14 DRVP
13 VDDP
12 FBP
11 VSSP
REFER TO PCB LAYOUT GUIDELINE
1
CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures.
1-888-INTERSIL or 321-724-7143 | Intersil (and design) is a registered trademark of Intersil Americas Inc.
Copyright © Intersil Americas Inc. 2003. All Rights Reserved. Elantec is a registered trademark of Elantec Semiconductor, Inc.
All other trademarks mentioned are the property of their respective owners.


Intersil Electronic Components Datasheet

EL7583 Datasheet

3-Channel DC-DC Converter

No Preview Available !

EL7583
Absolute Maximum Ratings (TA = 25°C)
VIN Input Voltage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .14V
VDDB, VDDP, VDDN . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .18V
LX Voltage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .18V
Maximum Continuous Output Current . . . . . . . . . . . . . . . . . . . . 0.5A
Storage Temperature . . . . . . . . . . . . . . . . . . . . . . . .-65°C to +150°C
Die Junction Temperature . . . . . . . . . . . . . . . . . . . . . . . . . . . . 125°C
Power Dissipation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . See Curves
Operating Ambient Temperature . . . . . . . . . . . . . . . .-40°C to +85°C
CAUTION: Stresses above those listed in “Absolute Maximum Ratings” may cause permanent damage to the device. This is a stress only rating and operation of the
device at these or any other conditions above those indicated in the operational sections of this specification is not implied.
IMPORTANT NOTE: All parameters having Min/Max specifications are guaranteed. Typ values are for information purposes only. Unless otherwise noted, all tests are
at the specified temperature and are pulsed tests, therefore: TJ = TC = TA
Electrical Specifications VIN = 3.3V, VBOOST = 12V, ROSC = 100k, TA = 25°C Unless Otherwise Specified
PARAMETER
DESCRIPTION
CONDITIONS
MIN TYP MAX UNIT
DC-DC BOOST CONVERTER
IQ1_B
Quiescent Current - Shut-down
ENBN = ENP = 0V
0.8 10 µA
IQ2_B
V(FBB)
Quiescent Current - Switching
Feedback Voltage
ENBN = VDDB
1.275
4.8
1.300
8
1.325
mA
V
VREF
VROSC
I(FBB)
Reference Voltage
Oscillator Set Voltage
Feedback Input Bias Current
1.260
1.260
1.310
1.325
0.1
1.360
1.390
V
V
µA
VDDB
Boost Converter Supply Range
2 17 V
DMAX
Maximum Duty Cycle
85 92
%
I(LX)MAX
Peak Internal FET Current
1.75 A
RDS-ON
Switch On Resistance
at VBOOST = 10V, I(LX) total = 350mA
0.22
ILEAK-SWITCH Switch Leakage Current
I(LX) total
1 µA
VBOOST
Output Range
VBOOST > VIN + VDIODE
5 17 V
VBOOST/VIN Line Regulation
2.7V < VIN < 13.2V, VBOOST = 15V
0.1 %
VBOOST/IO1 Load Regulation
50mA < IO1 < 250mA
0.5 %
FOSC-RANGE Frequency Range
ROSC range = 240kto 60k
200 1000 kHz
FOSC1
Switching Frequency
ROSC = 100k
620 680 750 kHz
POSITIVE REGULATED CHARGE PUMP (VON)
Most positive VON output depends on the magnitude of the VDDP input voltage (normally connected to VBOOST) and the external component
configuration (doubler or tripler)
VDDP
IQ1(VDDP)
IQ2(VDDP)
V(FBP)
Supply Input for Positive Charge Pump
Quiescent Current - Shut-down
Quiescent Current - Switching
Feedback Reference Voltage
Usually connected to VBOOST output
ENP = 0V
ENBN = ENP = VDDB
5
1.245
11.5
2.3
1.310
17
20
5
1.375
V
µA
mA
V
I(FBP)
Feedback Input Bias Current
0.1 µA
I(DRVP)
ILR_VON
FPUMP
RMS DRVP Output Current
Load Regulation
Charge Pump Frequency
VDDP = 12V
VDDP = 6V
5mA < IL < 15mA
Frequency set by ROSC - see boost section
60
15
-0.5 0.03 0.5
0.5*FOSC
mA
mA
%/mA
2


Part Number EL7583
Description 3-Channel DC-DC Converter
Maker Intersil Corporation
Total Page 15 Pages
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