FAN5640S7X Datasheet, PDF (5/11 Pages) Fairchild Semiconductor – FAN5640 Dual High-Side Constant Current Source for High-Voltage Keypad LED Illumination

Typical Characteristics
Unless otherwise noted, C_IN = 4.7µF, V_EN=1.8V, T_A = 25°C, white LED with V_F=3.3V at I_OUT=10mA.
48.0
47.5
R_EXT = 500K
47.0
46.5
46.0
45.5
45.0
-40°C
44.5
44.0
43.5
43.0
6
8
10
12
14
Input Voltage (V)
+25°C
+85°C
16
18
20
Figure 4. Quiescent Current vs. Input Voltage
474.3
474.2
R_EXT = 500K
474.1
474.0
473.9
473.8
473.7
6
8
10 12 14 16 18 20 22
Input Voltage (V)
Figure 5. RSET Voltage vs. Input Voltage
10
V_EN = 0V
9
-40°C
+85°C
12
10
8
8
7
6
6
4
5 ^+25°C
2
4
0
6
8
10
12
14
16
18
20
0
1
2
3
4
5
Input Voltage (V)
Enable Voltage (V)
Figure 6. Shutdown Current vs. Input Voltage
Figure 7. Enable Input Current vs. Enable Voltage
2.0
1.8
1.6
1.4
1.2
1.0
0.8
0.6
0.4
0.2
0.0
0.5
5.5
10.5
15.5
20.5
25.5
LED Current (mA)
Figure 8. Dropout Voltage vs. LED Current
2.5
2.0 ^IOUT=25mA
1.5
1.0
0.5
0.0 ^IOUT=2.5mA
-40
-20
0
20
40
60
80
Temperature (°C)
Figure 9. Dropout Voltage vs. Temperature
© 2006 Fairchild Semiconductor Corporation
FAN5640 • Rev. 1.0.2
5
www.fairchildsemi.com