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1
FN7335.3
EL7583
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 V
ON
and V
OFF
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 V
ON
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 -40C to +85C
temperature range.
Ordering Information
PART
NUMBER
PACKAGE
TAPE &
REEL
PKG. DWG. #
EL7583IR
20-Pin TSSOP
-
MDP0044
EL7583IR-T7
20-Pin TSSOP
7"
MDP0044
EL7583IR-T13
20-Pin TSSOP
13"
MDP0044
EL7583IRZ
(See Note)
20-Pin TSSOP
(Pb-free)
-
MDP0044
EL7583IRZ-T7
(See Note)
20-Pin TSSOP
(Pb-free)
7"
MDP0044
EL7583IRZ-T13
(See Note)
20-Pin TSSOP
(Pb-free)
13"
MDP0044
NOTE: Intersil Pb-free products employ special Pb-free material sets;
molding compounds/die attach materials and 100% matte tin plate
termination finish, which are RoHS compliant and compatible with
both SnPb and Pb-free soldering operations. Intersil Pb-free products
are MSL classified at Pb-free peak reflow temperatures that meet or
exceed the Pb-free requirements of IPC/JEDEC J STD-020.
Features
TFT-LCD display supply
- Boost regulator
- V
ON
charge pump
- V
OFF
charge pump
2.7V to 14V V
IN
supply
5V < V
BOOST
< 17V
5V < V
ON
< 40V
-40V < V
OFF
< 0V
V
BOOST
= 12V @ 470mA
V
BOOST
= 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 available (RoHS compliant)
Applications
TFT-LCD panels
PDAs
Pinout
EL7583
(20-PIN TSSOP)
TOP VIEW
ROSC
ENP
ENBN
VREF
PGND
PGND
DRVP
VDDP
FBP
VSSP
VSSB
SS
FBB
VDDB
LX
LX
LX
DRVN
VDDN
FBN
REFER TO PCB LAYOUT GUIDELINE
1
2
3
4
16
15
14
13
5
6
7
12
11
9
8
10
20
19
18
17
Data Sheet
February 4, 2005
CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures.
1-888-INTERSIL or 1-888-352-6832
|
Intersil (and design) is a registered trademark of Intersil Americas Inc.
Copyright Intersil Americas Inc. 2003, 2005. All Rights Reserved
All other trademarks mentioned are the property of their respective owners.
Absolute Maximum Ratings
(T
A
= 25C)
V
IN
Input Voltage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .14V
V
DDB
, V
DDP
, V
DDN
18V
LX Voltage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .18V
Maximum Continuous Output Current . . . . . . . . . . . . . . . . . . . . 0.5A
Storage Temperature . . . . . . . . . . . . . . . . . . . . . . . .-65C to +150C
Die Junction Temperature . . . . . . . . . . . . . . . . . . . . . . . . . . . . 125C
Power Dissipation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . See Curves
Operating Ambient Temperature . . . . . . . . . . . . . . . .-40C to +85C
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.
2
FN7335.3
February 4, 2005
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: T
J
= T
C
= T
A
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Electrical Specifications
V
IN
= 3.3V, V
BOOST
= 12V, R
OSC
=
100k
, T
A
= 25C 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
A
IQ2_B
Quiescent Current - Switching
ENBN = V
DDB
4.8
8
mA
V(FBB)
Feedback Voltage
1.275
1.300
1.325
V
V
REF
Reference Voltage
1.260
1.310
1.360
V
V
ROSC
Oscillator Set Voltage
1.260
1.325
1.390
V
I(FBB)
Feedback Input Bias Current
0.1
A
V
DDB
Boost Converter Supply Range
2
17
V
D
MAX
Maximum Duty Cycle
85
92
%
I(LX)
MAX
Peak Internal FET Current
1.75
A
R
DS-ON
Switch On Resistance
at V
BOOST
= 10V, I(LX) total = 350mA
0.22
I
LEAK-SWITCH
Switch Leakage Current
I(LX) total
1
A
V
BOOST
Output Range
V
BOOST
> V
IN
+ V
DIODE
5
17
V
V
BOOST
/
V
IN
Line Regulation
2.7V < V
IN
< 13.2V, V
BOOST
= 15V
0.1
%
V
BOOST
/
I
O1
Load Regulation
50mA < I
O1
< 250mA
0.5
%
F
OSC-RANGE
Frequency Range
R
OSC
range = 240k
to 60k
200
1000
kHz
F
OSC1
Switching Frequency
R
OSC
= 100k
620
680
750
kHz
POSITIVE REGULATED CHARGE PUMP (V
ON
)
Most positive V
ON
output depends on the magnitude of the V
DDP
input voltage (normally connected to V
BOOST
) and the external component
configuration (doubler or tripler)
V
DDP
Supply Input for Positive Charge Pump
Usually connected to V
BOOST
output
5
17
V
IQ1(V
DDP
)
Quiescent Current - Shut-down
ENP = 0V
11.5
20
A
IQ2(V
DDP
)
Quiescent Current - Switching
ENBN = ENP = V
DDB
2.3
5
mA
V(FBP)
Feedback Reference Voltage
1.245
1.310
1.375
V
I(FBP)
Feedback Input Bias Current
0.1
A
I(DRVP)
RMS DRVP Output Current
V
DDP
= 12V
60
mA
V
DDP
= 6V
15
mA
ILR_V
ON
Load Regulation
5mA < I
L
< 15mA
-0.5
0.03
0.5
%/mA
F
PUMP
Charge Pump Frequency
Frequency set by R
OSC
- see boost section
0.5*F
OSC
EL7583
3
FN7335.3
February 4, 2005
NEGATIVE REGULATED CHARGE PUMP (V
OFF
)
Most negative V
OFF
output depends on the magnitude of the V
DDN
input voltage (normally connected to V
BOOST
) and the external component
configuration (doubler or tripler)
V
DDN
Supply Input for Negative Charge Pump
Usually connected to V
BOOST
output
5
17
V
IQ1(V
DDN
)
Quiescent Current - Shut-down
ENBN = 0V
1.2
10
A
IQ2(V
DDN
)
Quiescent Current - Switching
ENBN = V
DDB
2.3
5
mA
V(FBN)
Feedback Reference Voltage
-80
0
+80
mV
I(FBN)
Feedback Input Bias Current
Magnitude of input bias
0.1
A
I(DRVN)
RMS DRVN Output Current
V
DDN
= 12V
60
mA
V
DDN
= 6V
15
mA
ILR_V
OFF
Load Regulation
-15mA < I
L
< -5mA
-0.5
0.03
0.5
%/mA
F
PUMP
Charge Pump Frequency
Frequency set by R
OSC
- see boost section
0.5*F
OSC
ENABLE CONTROL LOGIC
V
HI-ENX
Enable Input High Threshold
x = "BN", "P"
1.6
V
V
LO-ENX
Enable Input Low Threshold
x = "BN", "P"
0.8
V
IL(EN"X")
Logic Low Bias Current
X = "BN", "P" = 0V
0.1
A
IL(ENBN)
Logic High Bias Current
ENBN = 5V
7.5
15
A
IL(ENP)
Logic High Bias Current
ENP = 5V
3.3
7.5
A
OVER-TEMPERATURE PROTECTION
T
OT
Over-temperature Threshold
130
C
T
HYS
Over-temperature Hysteresis
40
C
Electrical Specifications
V
IN
= 3.3V, V
BOOST
= 12V, R
OSC
=
100k
, T
A
= 25C Unless Otherwise Specified (Continued)
PARAMETER
DESCRIPTION
CONDITIONS
MIN
TYP
MAX
UNIT
EL7583
Pin Descriptions
I = Input, O = Output, S = Supply
PIN NUMBER
PIN NAME
PIN TYPE
PIN FUNCTION
1
VSSB
S
Ground for DC/DC boost and reference circuits; chip substrate
2
SS
I
Soft-start input; the capacitor connected to this pin sets the current limited start time
3
FBB
I
Voltage feedback input for boost circuit; determines boost output voltage, V
BOOST
4
VDDB
S
Positive supply input for DC/DC boost circuits
5
LX
O
Boost regulator inductor drive connected to drain of internal NFET
6
LX
O
Boost regulator inductor drive connected to drain of internal NFET
7
LX
O
Boost regulator inductor drive connected to drain of internal NFET
8
DRVN
O
Driver output for the external generation of negative charge pump voltage, V
OFF
9
VDDN
S
Positive supply for input for V
OFF
generator
10
FBN
I
Voltage feedback input to determine negative charge pump output, V
OFF
11
VSSP
S
Negative supply pin for both the positive and negative charge pumps
12
FBP
I
Voltage feedback to determine positive charge pump output, V
ON
13
VDDP
S
Positive supply input for V
ON
generator
14
DRVP
O
Voltage driver output for the external generation of positive charge pump, V
ON
15
PGND
O
Power ground, connected to source of internal NFET
16
PGND
O
Power ground, connected to source of internal NFET
17
VREF
I
Voltage reference for charge pump circuits; decouple to ground
18
ENBN
I
Enable pin for boost (V
BOOST
generation) and negative charge pump (V
OFF
generation);
active high
19
ENP
I
Enable for DRVP (V
ON
generation); active high
20
ROSC
I
Connected to an external resistor to ground; sets the switching frequency of the DC/DC
boost
4
FN7335.3
February 4, 2005
EL7583
5
FN7335.3
February 4, 2005
Typical Performance Curves
FIGURE 1. EFFICIENCY vs I
OUT
0
100
200
300
400
500
600
700
800
95
90
85
80
75
70
65
60
55
50
I
OUT
(mA)
E
F
F
I
CIENCY (%
)
V
IN
=3.3V
FREQ=1MHz
15V
12V
9V
5V
FIGURE 2. EFFICIENCY vs I
OUT
0
100
200
300
400
500
600
700
800
95
90
85
80
75
70
65
60
I
OUT
(mA)
E
F
F
I
CIENCY (%
)
V
IN
=5V
FREQ=1MHz
15V
12V
9V
FIGURE 3.
0
100
200
300
400
500
600
700
800
95
90
85
80
75
70
65
60
I
OUT
(mA)
EFF
I
CIENCY (%
)
V
IN
=3.3V
FREQ=700kHz
15V
12V
9V
5V
EFFICIENCY vs I
OUT
FIGURE 4.
0
100
200
300
400
500
600
700
800
95
90
85
80
75
65
60
I
OUT
(mA)
EFF
I
CIENCY (%
)
V
IN
=5V
FREQ=700kHz
15V
12V
9V
70
EFFICIENCY vs I
OUT
FIGURE 5.
970
968
966
964
962
3
3.5
6
V
DDB
(V)
FREQUE
N
C
Y
(k
Hz
)
4.5
965
963
5.5
969
4
5
967
R
OSC
= 61.9k
F
S
vs V
DDB
FIGURE 6.
1.27
1.26
1.25
-50
150
TEMPERATURE (C)
VOL
T
AG
E (
V
)
50
1.265
0
100
1.255
V
REF
vs TEMPERATURE
EL7583
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