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 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
CNTL_HYS
Input Voltage
V
IN
= 3V, V
O
= 12V, C
1
= 4.7µF, C
2
= 1µF, C
3
= 0.1µF, R
1
= 5Ω, 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
25
V
CNTL
= 1V
V
OUT
rising
V
OUT
falling
13.9
17.5
17
500
1
V
CNTL
= 0V, V
LX
= 12V
800
V
CNTL
= 2V, I
S
= 0
85
1000
90
1
V
IN
= 2.6V - 5.5V
0.05
1
1200
15
18.5
18
16.1
19.5
19
2
10
1.5
2.5
1
TYP
MAX
13.2
1
4
UNIT
V
µA
mA
µA
V
µA
mV
mV
mV
mA
V
V
mA
Ω
µA
kHz
%
µA
%/V
Shut-down Supply Current
Quiescent Current
COMP Pin Pull-up Current
COMP Voltage Swing
CNTL Shut-down Current
Chip Enable Voltage
Chip Disable Voltage
Chip Disable Hysteresis 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-PIN TSOT 8-PIN MSOP
1
2
3
4
5
6
7
8
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.
京公网安备 11010802033920号
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