Data Sheet

LP2951 — Adjustable Micro-Power Voltage Regulator
© 2002 Fairchild Semiconductor Corporation www.fairchildsemi.com
LP2951 Rev. 1.1.1 5
Typical Application
Figure 10. Adjustable Regulator
Figure 11. Fixed Output 5 V
Note:
6. C
O
is required between the output and ground for stability at output voltages of 5 V or more. Since I
FB
is controlled to
less than 40 nA, the error associated with this term is negligible in most applications. At lower output voltage, more
capacitance is required. without this capacitance the part oscillates.
SHUTDOWN
V
O
= V
REF
(1+ R
1
/
R
2
)+I
FB
R
1
V
OUT
V
IN
R
2
R
1
Co
1
μ
F
KA78RLOOD
V
IN
8
V
OUT
1
FB
7
V
REF
GND
4
5
3
ERROR
ERROR
SD
LP2951
* Pin2 and Pin 6
are left open
(6)
SHUTDOWN
V
OUT
V
IN
R
2
R
1
Co
1
μ
F
KA78RLOOD
V
IN
8
V
OUT
1
FB
7
V
REF
GND
4
5
3
ERROR
ERROR
SD
LP2951
TAP
6
Program
2
(6)