CAUTION: Do not operate at or near the maximum ratings listed for extended periods of time. Exposure to such conditions may adversely impact product reliability and
result in failures not covered by warranty.
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
PARAMETER
V
IN
I
Q1
I
Q1
I
COMP
V
COMP
I
CNTL
V
CNTL1
V
CNTL2
V
IN
= 3V, V
O
= 12V, C
1
= 4.7µF, L = 33µH, C
2
= 1µF, C
3
= 0.1µF, R
1
= 5, T
A
=+ 25°C,
Unless Otherwise Specified.
DESCRIPTION
CONDITIONS
MIN
2.6
V
CNTL
= 0V
V
CNTL
= 1V, load disconnected
COMP connected to SGND
0.5
CNTL = 0V
240
100
V
CNTL
= 1V
V
OUT
rising
V
OUT
falling, with resistive load
14
17
15
500
0.7
V
CNTL
= 0V, V
LX
= 12V
800
V
CNTL
= 2V, I
S
= 0
85
1000
90
1
V
IN
= 2.6V - 5.5V
0.03
1
1200
15
18
16
16
19
17.5
1
11
1.5
TYP
MAX
13.2
1
1.5
20
2.5
1
UNIT
V
µA
mA
µA
V
µA
mV
mV
mA
V
V
mA
µA
kHz
%
µA
%/V
Input Voltage
Total Input Current at Shut-down
Quiescent Supply Current at V
O
Pin
COMP Pin Pull-up Current
COMP Voltage Swing
CNTL Shut-down Current
Chip Enable Voltage
Chip Disable Voltage
I
OUT_ACCURACY
V
CNTL
= 1V
V
OUT1
V
OUT2
ILX
R
DS_ON
I
LEAK
F
S
D
MAX
I
CS
I
O
/V
IN
Over-voltage Threshold
Over-voltage Threshold
MOSFET Current Limit
MOSFET On-resistance
MOSFET Leakage Current
Switching Frequency
Maximum Duty Ratio
CS Input Bias Current
Line Regulation
Pin Descriptions
8 LD TSOT
1
2
3
4
5
6
7
8
8 LD MSOP
7
8
5
6
3
4
1
2
PIN NAME
COMP
CNTL
VOUT
LX
PGND
SGND
CS
VIN
DESCRIPTION
Compensation pin. A compensation cap (4700pF to 1µF) is normally connected between this pin and
SGND.
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.
Output voltage sense. Use for over voltage protection.
Inductor connection pin. The drain of internal MOSFET.
Power Ground pin. The source of internal MOSFET.
Signal Ground. Ground pin for internal control circuitry. Needs to connect to PGND at only one point.
Current sense pin. Connect to sensing resistor to set the LED bias current.
Power supply for internal control circuitry.
FN7112 Rev 5.00
December 22, 2008
Page 3 of 12
EL7513
Block Diagram
2.6V TO
5.5V
C
IN
4.7µF
REFERENCE
GENERATOR
1MHz
OSCILLATOR
THERMAL
SHUTDOWN
OVER-VOLTAGE
PROTECTION
V
OUT
LX
PWM
LOGIC
I(LED)
C
OUT
1µF
L
33µH
V
IN
COMP
C
COMP
0.1µF
+
+
+
BOOST
I-SENSE
START-UP
CONTROL
PGND
C
S
5
PWM
SIGNAL
617k
50k
ERROR AMP
+
-
V
CNTL
CNTL
SGND
Typical Performance Curves
All performance curves and waveforms are taken with C
1
= 4.7µF, C
2
= 1µF, C
3
= 0.1µF, L = 33µF, V
IN
= 3.3V, V
CNTL
= 1V, R
1
= 5, 4 LEDs in a
series; unless otherwise specified.
1.05
1.04
1.03
1.02
1.01
1.00
2.5
3.5
3.0
2.5
F
S
(MHz)
I
IN
(µA)
2.0
1.5
1.0
0.5
3.0
3.5
4.0
V
IN
(V)
4.5
5.0
5.5
0
2.5
4.5
6.5
8.5
V
IN
(V)
10.5
12.5
14.5
V
CNTL
= 0V, 0.1V
WHITE LEDs DISCONNECTED
FIGURE 1. SWITCHING FREQUENCY vs V
IN
FIGURE 2. QUIESCENT CURRENT
FN7112 Rev 5.00
December 22, 2008
Page 4 of 12
EL7513
Typical Performance Curves
(Continued)
All performance curves and waveforms are taken with C
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