NCP500 ON, NCP500 Datasheet - Page 15

• Manufacturer Part Number: NCP500
• Description: 150 mA CMOS Low Noise Low-Dropout Voltage Regulator
• Manufacturer: ON

Unregulated
Battery or
Input
Voltage
The NCP500 series can be current boosted with a PNP transis-
tor. Resistor R in conjunction with V
when the pass transistor begins conducting; this circuit is not
short circuit proof. Input/Output differential voltage minimum is
increased by V
OFF
R
1.0 mF
ON
Figure 30. Current Boost Regulator
Figure 27. Typical Application Circuit
Q1
BE
C1
of the pass resistor.
+
1
2
3
1
2
3
0.01
BE
0.1
10
1
of the PNP determines
0
5
4
5
4
UNSTABLE
STABLE
25
1.0 mF
Output
http://onsemi.com
+
I
O,
50
Figure 29. Stability
C2
V
out
Output Current (mA)
Input
NCP500
Q2
15
75
Unregulated
Battery or
Short circuit current limit is essentially set by the V
R1. I
Voltage
OFF
Figure 31. Current Boost Regulator with Short
C
T
V
R1
R2
A
SC
in
out
100
ON
= 40 C to 125 C
= up to 6.0 V
= ((V
= 1 mF to 10 mF
Figure 28. Typical Application Circuit
BEQ2
1.0 mF
C1
R3
125
+
− ib * R2) / R1) + I
Q1
Circuit Limit
150
1
2
3
1
2
3
O(max) Regulator
6
5
4
5
4
BE
of Q2 and
1.0 mF
+
C2
Output
V
out