CS52015-3GST3 ONSEMI [ON Semiconductor], CS52015-3GST3 Datasheet - Page 4

• Manufacturer Part Number: CS52015-3GST3
• Description: 1.5 A, 3.3 V Fixed Linear Regulator
• Manufacturer: ONSEMI [ON Semiconductor]

voltage at currents up to 1.5 A. The regulator is protected
against overcurrent conditions and includes thermal
shutdown.
transistor and requires an output capacitor for stability. A
detailed procedure for selecting this capacitor is included in
the Stability Considerations section.
Stability Considerations
main characteristics of a linear regulator: start−up delay,
load transient response, and loop stability.
size and temperature constraints. A tantalum or aluminum
electrolytic capacitor is best, since a film or ceramic
capacitor with almost zero ESR can cause instability. The
aluminum electrolytic capacitor is the least expensive
solution. However, when the circuit operates at low
temperatures, both the value and ESR of the capacitor will
vary considerably. The capacitor manufacturer’s data sheet
provides this information.
applications, but with high current regulators such as the
CS52015−3 the transient response and stability improve
with higher values of capacitance. The majority of
applications for this regulator involve large changes in load
current so the output capacitor must supply the
instantaneous load current. The ESR of the output capacitor
causes an immediate drop in output voltage given by:
The CS52015−3 linear regulator provides a 3.3 V output
The CS52015−3 has a composite PNP−NPN output
The output compensation capacitor helps determine three
The capacitor value and type is based on cost, availability,
A 22 mF tantalum capacitor will work for most
−100
−200
1500
300
200
100
750
0
0
0
1
Figure 7. Transient Response
2
DV + DI
3
4
Time (mS)
C
OUT
5
ESR
= C
6
IN
= 22 mF Tantalum
7
APPLICATIONS INFORMATION
8
9
http://onsemi.com
10
4
output capacitor network consisting of several tantalum and
ceramic capacitors in parallel. This reduces the overall ESR
and reduces the instantaneous output voltage drop under
transient load conditions. The output capacitor network
should be as close to the load as possible for the best results.
Protection Diodes
regulator it is sometimes necessary to add protection diodes.
If the input voltage of the regulator gets shorted, the output
capacitor will discharge into the output of the regulator. The
discharge current depends on the value of the capacitor, the
output voltage and the rate at which V
CS52015−3 linear regulator, the discharge path is through a
large junction and protection diodes are not usually needed.
If the regulator is used with large values of output
capacitance and the input voltage is instantaneously shorted
to ground, damage can occur. In this case, a diode connected
as shown in Figure 9 is recommended.
For microprocessor applications it is customary to use an
When large external capacitors are used with a linear
0.100
0.075
0.050
0.025
0.000
Figure 9. Protection Diode Scheme for Large
V
IN
0
Figure 8. Load Regulation vs. Output
C
1
Output Capacitors
IN4002 (Optional)
V
CS52015−3
T
IN
CASE
Output Current (A)
GND
Current
= 125°C
V
OUT
1
T
CASE
IN
T
drops. In the
CASE
= 25°C
C
V
2
OUT
= 0°C
2