PRODUCT SPECIFICATION
RC4190
L
x
D1
2N2907
VOUT = 5V
1.0 mH
+VS
4
CF
VBAT
L
x
5
6
37K
13K
2.4K
4190
VFB
2.2M
7
IC
C
x
GND
1/3 4025
2
3
V
c
C
x
15K
2N3904
65-2679
Figure 15. Battery Back-Up Circuit
L
x
1N914
VOUT = 9V
To 7V
9V to 2.2V
1.0 mH
VBAT
R1
1M
R2
110K
4
x
5
+V
s
CF
50µF
6
1
L
IC
7
4190
VFB
LBR
GND
R3
25K
C
R4*
910K
x
2
3
R5*
260K
C
x
50 pF
* Optional
65-2680
Figure 16. 9.0V Battery Life Extender
L
x
1N914
VOUT = 9V
3V to 9V
VBAT
1.0 mH
R1
1M
R2
77K
4
x
5
+V
s
CF
6
1
L
µ
F
50
IC
7
4190
VFB
LBR
R3
13K
C
GND
R4*
910
x
2
3
R5*
260K
C
x
50 pF
* Optional
65-2682
Figure 17. Bootstrapped Operation (Step-Up)
12
RAYTHEON [ RAYTHEON COMPANY ]
