CS52015-1GDP3 CHERRY [Cherry Semiconductor Corporation], CS52015-1GDP3 Datasheet - Page 4

• Manufacturer Part Number: CS52015-1GDP3
• Description: 1.5A Adjustable Linear Regulator
• Manufacturer: CHERRY [Cherry Semiconductor Corporation]

The CS52015-1 linear regulator provides adjustable volt-
ages at currents up to 1.5A. The regulator is protected
against overcurrent conditions and includes thermal
shutdown.
The CS52015-1 has a composite PNP-NPN output transistor
and requires an output capacitor for stability. A detailed
procedure for selecting this capacitor is included in the
Stability Considerations section.
The 52015-1 has an output voltage range of 1.25V to 5.5V.
An external resistor divider sets the output voltage as
shown in Figure 1. The regulator maintains a fixed 1.25V
(typical) reference between the output pin and the adjust
pin.
A resistor divider network R1 and R2 causes a fixed cur-
rent to flow to ground. This current creates a voltage
across R2 that adds to the 1.25V across R1 and sets the
overall output voltage. The adjust pin current (typically
Transient Response
Adjust Pin Current vs. Temperature
1500
-100
-200
70.0
65.0
60.0
55.0
50.0
45.0
40.0
200
100
750
0
0
0
0
10
1
20
2
I
O
30
Adjustable Operation
= 10mA
3
40
50
4
Temperature (°C)
60
Time mS
5
V
C
C
70
OUT
OUT
Adj
6
=0.1mF
80
=3.3V
=C
IN
90 100
=22mF Tantalum
7
Typical Performance Characteristics
8
Applications Information
110 120 130
9
10
4
Short Circuit Current vs V
50µA) also flows through R2 and adds a small error that
should be taken into account if precise adjustment of V
is necessary.
The output voltage is set according to the formula:
The term I
pin current.
R1 is chosen so that the minimum load current is at least
2mA. R1 and R2 should be the same type, e.g. metal film
for best tracking over temperature. While not required, a
bypass capacitor from the adjust pin to ground will
improve ripple rejection and transient response. A 0.1µF
tantalum capacitor is recommended for Òfirst cutÓ design.
Type and value may be varied to obtain optimum perfor-
mance vs price.
Ripple Rejection vs. Frequency
85
75
65
55
45
35
25
15
3.5
3.3
3.1
2.9
2.7
2.5
2.3
2.1
1.9
1.7
1.5
10
V
1.0
1
OUT
Adj
1.5
´ R2 represents the error added by the adjust
T
I
(V
V
C
= V
OUT
CASE
RIPPLE
Adj
IN
2.0
10
Ð V
= 0.1mF
= 1.5A
REF
2
= 25°C
OUT
= 1.0V
2.5
IN
´
) = 3V
-V
(
3.0
Frequency (Hz)
PP
OUT
R1 + R2
10
V
R1
3
3.5
IN
- V
4.0
OUT
)
10
+ I
(V)
4
4.5
Adj
5.0
´ R2
10
5.5
5
6.0
6.5
10
6
OUT
7.0