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EL1848
Absolute Maximum Ratings (T A = 25°C)
COMP, CNTL, CS to SGND. . . . . . . . . . . . . . . . . . . . . . -0.3V to +6V
V IN to SGND . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .+14V
V OUT to SGND . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .+14V
LX to PGND . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .+16V
SGND to PGND . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -0.3V to +0.3V
Storage Temperature . . . . . . . . . . . . . . . . . . . . . . . .-65°C to +150°C
Ambient Operating Temperature . . . . . . . . . . . . . . . .-40°C to +85°C
Power Dissipation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . See Curves
Operating Junction Temperature . . . . . . . . . . . . . . . . . . . . . . . 125°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. This part is ESD sensitive. Handle with care.
IMPORTANT NOTE: All parameters having Min/Max specifications are guaranteed. Typ values are for information purposes only. Unless otherwise noted, all tests areat
the specified temperature and are pulsed tests, therefore: T J = T C = T A
Electrical Specifications
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.
PARAMETER
DESCRIPTION
CONDITIONS
MIN
TYP
MAX
UNIT
V IN
I Q1
Input Voltage
Total Input Current at Shut-down
V CNTL = 0V
2.6
13.2
1
V
μA
I Q1
I COMP
V COMP
I CNTL
Quiescent Supply Current at V O Pin
COMP Pin Pull-up Current
COMP Voltage Swing
CNTL Shut-down Current
V CNTL = 1V, load disconnected
COMP connected to SGND
CNTL = 0V
0.5
1
11
1.5
1.5
20
2.5
1
mA
μA
V
μA
V CNTL1
V CNTL2
Chip Enable Voltage
Chip Disable Voltage
240
100
mV
mV
I OUT_ACCURACY V CNTL = 1V
V CNTL = 1V
14
15
16
mA
V OUT1
V OUT2
Over-voltage Threshold
Over-voltage Threshold
V OUT rising
V OUT falling, with resistive load
13
11
14
12
15
13
V
V
ILX
R DS_ON
MOSFET Current Limit
MOSFET On-resistance
400
0.7
mA
?
I LEAK
MOSFET Leakage Current
V CNTL = 0V, V LX = 12V
1
μA
F S
Switching Frequency
800
1000
1200
kHz
D MAX
I CS
? I O / ? V IN
Maximum Duty Ratio
CS Input Bias Current
Line Regulation
V CNTL = 2V, I S = 0
V IN = 2.6V - 5.5V
85
90
0.03
1
%
μA
%/V
Pin Descriptions
PIN NUMBER
1
2
3
4
5
6
7
8
PIN NAME
COMP
CNTL
VOUT
LX
PGND
SGND
CS
VIN
3
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.
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