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Electrical Characteristics
V IN = 6V to 20V, T A = -40°C to +85°C, unless otherwise noted. Typical values are at T A = 25°C, V IN = 14V, I LED = 15mA.
Symbol
Parameter
Condition
Min.
Typ.
Max.
Unit
Power Supplies
V IN
Input Voltage Range
6
20
V
I Q
I SD
V EN
I EN
Quiescent Current
Shutdown Supply Current
Enable High-Level Input Voltage
Enable Low-Level Input Voltage
Enable Input Current
Measured at GND pin, V IN = 20V
Measured at GND pin, V IN = 6V
V IN = 20V, EN = GND
V IN = 6V, EN = GND
EN = 5V
EN=GND
1.2
48
44
8
5
9
0.1
65
55
13
8
0.4
15
1.0
μA
μA
V
μA
Regulation
Channel 2 Current Limit
I LIM1
I LIM2
Channel 1 Current Limit (2)
(2)
30
30
mA
mA
? I OUT
Output Current Accuracy
2.5mA < I OUT ≤ 5mA (3)
5mA < I OUT ≤ 25mA (3)
-15
-10
+15
+10
%
I MATCH
Channel-to-Channel Current Matching (4)
-3
+3
%
V DO
V REF
I MIRROR
Output Dropout Voltage
Reference Voltage
Current Mirror Ratio
V IN – V OUT at 90% I OUT
Programmed I OUT = 25mA
V IN – V OUT at 90% I OUT
Programmed I OUT = 2.5mA
I OUT / I RSET
1.80
0.43
475
275
2.50
0.60
V
mV
Power Supply Current Dependency V OUT = V IN – 2V
? I OUT / ? V IN
(5)
0.5
2.0
%/V
T ON
TSD
Turn-On Time
Thermal Shutdown Protection
V IN =14V , I OUT =12.5mA (6)
Rising Temperature
Hysteresis
5
150
20
8
μs
°C
Notes:
2. If only one channel is needed, IOUT1 can be tied to IOUT2 to boost maximum current to 50mA.
3. R EXT resistor tolerance adds to the specification limit of the pin RSET to determine overall current accuracy.
4. Matching defined as [(I OUT1 -I OUT2 )/(I OUT1 +I OUT2 )]×100.
5. V OUT is the total voltage drop across the LED string.
6. Measured from EN crossing 1.8V to output current reaching 90% of target I OUT .
? 2006 Fairchild Semiconductor Corporation
FAN5640 ? Rev. 1.0.2
4
www.fairchildsemi.com
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