1
FN7112.3
EL7513
White LED Step-Up Regulator
The EL7513 is a constant current
boost regulator specially designed for
driving white LEDs. It can drive 4
LEDs in series or up to 12 LEDs in parallel/series
configuration and achieves efficiency up to 91%.
The brightness of the LEDs is adjusted through a voltage
level on the CNTL pin. When the level falls below 0.1V, the
chip goes into shut-down mode and consumes less than
1A of supply current for V
IN
less than 5.5V.
The EL7513 is available in the 8-pin TSOT and 8-pin MSOP
packages. The TSOT package is just 1mm high, compared
to 1.45mm for the standard SOT23 package.
Features
2.6V to 13.2V input voltage
18V maximum output voltage
Drives up to 12 LEDs
1MHz switching frequency
Up to 91% efficiency
1A maximum shut-down current
Dimming control
8-pin TSOT and 8-pin MSOP packages
Applications
PDAs
Cellular phones
Digital cameras
White LED backlighting
Ordering Information
PART
NUMBER
PACKAGE
TAPE & REEL PKG. DWG. #
EL7513IWT-T7
8-Pin TSOT
7" (3K pcs)
MDP0049
EL7513IWT-T7A
8-Pin TSOT
7" (250 pcs)
MDP0049
EL7513IWTZ-T7
(Note)
8-Pin TSOT
(Pb-Free)
7" (3K pcs)
MDP0049
EL7513IWTZ-T7A
(Note)
8-Pin TSOT
(Pb-Free)
7" (250 pcs)
MDP0049
EL7513IY
8-Pin MSOP
-
MDP0043
EL7513IY-T7
8-Pin MSOP
7"
MDP0043
EL7513IY-T13
8-Pin MSOP
13"
MDP0043
NOTE: Intersil Pb-Free products employ special Pb-free material
sets; molding compounds/die attach materials and 100% matte tin
plate termination finish, which is 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-020B.
Data Sheet
April 16, 2004
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. 2004. All Rights Reserved. Elantec is a registered trademark of Elantec Semiconductor, Inc.
All other trademarks mentioned are the property of their respective owners.
2
Pinouts
Typical Connection
EL7513
(8-PIN TSOT)
TOP VIEW
EL7513
(8-PIN MSOP)
TOP VIEW
COMP
CNTL
VOUT
LX
VIN
CS
SGND
PGND
1
2
3
4
8
7
6
5
CS
VIN
PGND
SGND
CNTL
COMP
LX
VOUT
1
2
3
4
8
7
6
5
C
1
LX
VIN
VOUT
CS
PGND
SGND
CNTL
COMP
4.7F
C
3
0.1F
C
2
1F
L
33H
D
2.6V TO
5.5V
R
1
V
CTRL
5
EL7513
3
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
Absolute Maximum Ratings
(T
A
= 25C)
COMP, CNTL, CS to SGND. . . . . . . . . . . . . . . . . . . . . . -0.3V to +6V
V
IN
to SGND . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .+14V
V
OUT
to SGND . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .+19V
LX to PGND . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .+20V
SGND to PGND . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -0.3V to +0.3V
Storage Temperature . . . . . . . . . . . . . . . . . . . . . . . .-65C to +150C
Ambient Operating 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. This part is ESD sensitive. Handle with care.
Electrical Specifications
V
IN
= 3V, V
O
= 12V, C
1
= 4.7F, L = 33H, C
2
= 1F, C
3
= 0.1F, R
1
= 5
, T
A
= 25C,
Unless Otherwise Specified
PARAMETER
DESCRIPTION
CONDITIONS
MIN
TYP
MAX
UNIT
V
IN
Input Voltage
2.6
13.2
V
I
Q1
Total Input Current at Shut-down
V
CNTL
= 0V
1
A
I
Q1
Quiescent Supply Current at V
O
Pin
V
CNTL
= 1V, load disconnected
1
1.5
mA
I
COMP
COMP Pin Pull-up Current
COMP connected to SGND
11
20
A
V
COMP
COMP Voltage Swing
0.5
1.5
2.5
V
I
CNTL
CNTL Shut-down Current
CNTL = 0V
1
A
V
CNTL1
Chip Enable Voltage
240
mV
V
CNTL2
Chip Disable Voltage
100
mV
I
OUT_ACCURACY
V
CNTL
= 1V
V
CNTL
= 1V
14
15
16
mA
V
OUT1
Over-voltage Threshold
V
OUT
rising
17
18
19
V
V
OUT2
Over-voltage Threshold
V
OUT
falling, with resistive load
15
16
17.5
V
ILX
MOSFET Current Limit
500
mA
R
DS_ON
MOSFET On-resistance
0.7
I
LEAK
MOSFET Leakage Current
V
CNTL
= 0V, V
LX
= 12V
1
A
F
S
Switching Frequency
800
1000
1200
kHz
D
MAX
Maximum Duty Ratio
V
CNTL
= 2V, I
S
= 0
85
90
%
I
CS
CS Input Bias Current
1
A
I
O
/
V
IN
Line Regulation
V
IN
= 2.6V - 5.5V
0.03
%/V
Pin Descriptions
8-PIN TSOT 8-PIN MSOP
PIN NAME
DESCRIPTION
1
7
COMP
Compensation pin. A compensation cap (4700pF to 1F) is normally connected between this pin and
SGND.
2
8
CNTL
Control pin for dimming and shut-down. A voltage between 250mV and 5.5V controls the brightness,
and less than 100mV shuts down the converter.
3
5
VOUT
Output voltage sense. Use for over voltage protection.
4
6
LX
Inductor connection pin. The drain of internal MOSFET.
5
3
PGND
Power Ground pin. The source of internal MOSFET.
6
4
SGND
Signal Ground. Ground pin for internal control circuitry. Needs to connect to PGND at only one point.
7
1
CS
Current sense pin. Connect to sensing resistor to set the LED bias current.
8
2
VIN
Power supply for internal control circuitry.
EL7513
4
Block Diagram
REFERENCE
GENERATOR
1MHz
OSCILLATOR
THERMAL
SHUTDOWN
BOOST
I-SENSE
START-UP
CONTROL
+
+
-
+
+
PWM
SIGNAL
C
OUT
1F
I(LED)
OVER-VOLTAGE
PROTECTION
ERROR AMP
CNTL
COMP
V
IN
C
IN
4.7F
C
COMP
0.1F
SGND
C
S
PGND
LX
V
OUT
L
33H
2.6V TO
5.5V
5
V
CNTL
PWM
LOGIC
617K
50K
Typical Performance Curves
All performance curves and waveforms are taken with C
1
= 4.7F, C
2
= 1F, C
3
= 0.1F, L = 33F, V
IN
= 3.3V, V
CNTL
= 1V, R
1
= 5
, 4 LEDs in a
series; unless otherwise specified.
FIGURE 1. SWITCHING FREQUENCY vs V
IN
FIGURE 2. QUIESCENT CURRENT
1.05
1.04
1.02
1.01
1
2.5
3.5
4.5
V
IN
(V)
F
S
(MHz)
1.03
5.5
3
4
5
3.5
2
1
0
2.5
6.5
10.5
V
IN
(V)
I
IN
(A)
3
14.5
4.5
8.5
12.5
2.5
1.5
0.5
V
CNTL
=0V, 0.1V
WHITE LEDs DISCONNECTED
EL7513
5
FIGURE 3. I
LED
vs V
CNTL
FIGURE 4. I
LED
vs V
IN
FIGURE 5A. 2 LEDs IN A SERIES
FIGURE 5B. EFFICIENCY vs I
O
FIGURE 5.
FIGURE 6A. 3 LEDs IN A SERIES
FIGURE 6B. EFFICIENCY vs I
O
FIGURE 6.
Typical Performance Curves
(Continued)
All performance curves and waveforms are taken with C
1
= 4.7F, C
2
= 1F, C
3
= 0.1F, L = 33F, V
IN
= 3.3V, V
CNTL
= 1V, R
1
= 5
, 4 LEDs in a
series; unless otherwise specified.
0
5
10
15
20
25
30
35
0
0.5
1
1.5
2
2.5
V
CNTL
(V)
I
LED
(mA
)
14
14.2
14.4
14.6
14.8
15
15.2
15.4
15.6
15.8
16
2.5
3.5
4.5
5.5
V
IN
(V)
V
CNTL
=1V
I
LED
(mA)
3
4
5
LX
VIN
VOUT
CS
PGND
SGND
CNTL
COMP
4.7F
0.1F
1F
L
33H
BAT54HT1
V
IN
2
5
1
6
3
7
4
8
V
CTRL
5
2 LEDs IN A SERIES
90
85
80
75
70
5
10
15
20
25
30
I
O
(mA)
E
F
FICIE
NCY (
%
)
L=COILCRAFT LPO1704-333CM
V
IN
=4.2V
V
IN
=2.7V
LX
VIN
VOUT
CS
PGND
SGND
CNTL
COMP
4.7F
0.1F
1F
L
33H
BAT54HT1
V
IN
2
5
1
6
3
7
4
8
V
CTRL
5
3 LEDs IN A SERIES
90
85
80
75
70
5
10
15
20
25
30
I
O
(mA)
E
F
F
I
CIENCY (%
)
L=COILCRAFT LPO1704-333CM
V
IN
=4.2V
V
IN
=2.7V
EL7513
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