CS5203A-5 Datasheet PDF - ON Semiconductor
| Part Number | CS5203A-5 | |
| Description | 3.0 A Adjustable/ and Fixed 1.5 V/ 3.3 V and 5.0 V Linear Regulators | |
| Manufacturers | ON Semiconductor | |
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CS5203A−1, CS5203A−2,
CS5203A−3, CS5203A−5
3.0 A Adjustable, and
Fixed 1.5 V, 3.3 V and 5.0 V
Linear Regulators
The CS5203A series of linear regulators provides 3.0 A at
adjustable and fixed voltages with an accuracy of ±1.0% and ±2.0%
respectively. The adjustable version uses two external resistors to set
the output voltage within a 1.25 V to 13 V range.
The regulators are intended for use as post regulators and
microprocessor supplies. The fast loop response and low dropout
voltage make these regulators ideal for applications where low voltage
operation and good transient response are important.
The circuit is designed to operate with dropout voltages as low as
1.0 V depending on the output current level. The maximum quiescent
current is only 10 mA at full load.
The regulators are fully protected against overload conditions with
protection circuitry for Safe Operating Area (SOA), overcurrent and
thermal shutdown.
The CS5203A is pin compatible with the LT1085 family of linear
regulators but has lower dropout voltage.
The regulators are available in TO−220−3 and surface mount
D2PAK−3 packages.
Features
• Pb−Free Package is Available
• Output Current to 3.0 A
• Output Trimmed to ±1.0%
• Dropout Voltage 1.05 V @ 3.0 A
• Fast Transient Response
• Fault Protection Circuitry
♦ Thermal Shutdown
♦ Overcurrent Protection
♦ Safe Area Protection
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12 3
123
123
TO−220
THREE LEAD
T SUFFIX
CASE 221A
D2PAK−3
DP SUFFIX
CASE 418AB
D2PAK−3
(Short Lead)
DPS SUFFIX
CASE 418F
Adjustable
Output
Tab = VOUT
Pin 1. Adj
2. VOUT
3. VIN
Fixed
Output
Tab = VOUT
Pin 1. GND
2. VOUT
3. VIN
ORDERING INFORMATION
See detailed ordering and shipping information in the package
dimensions section on page 8 of this data sheet.
DEVICE MARKING INFORMATION
See general marking information in the device marking
section on page 8 of this data sheet.
VOUT
VIN
Thermal
Shutdown
Bandgap
Output
Current
Limit
− + Error
Amplifier
Adj
Figure 1. Block Diagram − CS5203A−1
© Semiconductor Components Industries, LLC, 2004
June, 2004 − Rev. 7
1
Publication Order Number:
CS5203A/D
|
| |
 
CS5203A−1, CS5203A−2, CS5203A−3, CS5203A−5
100
90
80
70
60
50
40
30
20
10
0
101
TCASE = 25°C
IOUT = 3.0 A
(VIN − VOUT) = 3.0 V
VRIPPLE = 1.6 VPP
CAdj = 25 mF
102 103
Frequency (Hz)
104
105
Figure 9. Ripple Rejection vs. Frequency
(Adjustable Versions)
APPLICATIONS INFORMATION
The CS5203A family of linear regulators provides fixed
or adjustable voltages at currents up to 3.0 A. The regulators
are protected against short circuit, and include thermal
shutdown and safe area protection (SOA) circuitry. The
SOA protection circuitry decreases the maximum available
output current as the input−output differential voltage
increases.
The CS5203A 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.
VIN
C1
VIN VOUT
CS5203A−1
Adj
VREF
R1
VOUT
C2
IAdj
CAdj
R2
Adjustable Operation
The adjustable regulator (CS5203A−1) has an output
voltage range of 1.25 V to 13 V. An external resistor divider
sets the output voltage as shown in Figure 10. The regulator
maintains a fixed 1.25 V (typical) reference between the
output pin and the adjust pin.
A resistor divider network R1 and R2 causes a fixed
current to flow to ground. This current creates a voltage
across R2 that adds to the 1.25 V across R1 and sets the
overall output voltage. The adjust pin current (typically
50 mA) also flows through R2 and adds a small error that
should be taken into account if precise adjustment of VOUT
is necessary.
The output voltage is set according to the formula:
ǒ ǓVOUT + VREF
R1 ) R2
R1
) IAdj
R2
The term IAdj × R2 represents the error added by the adjust
pin current.
R1 is chosen so that the minimum load current is at least
10 mA. R1 and R2 should be the same type, e.g. metal film
for best tracking over temperature. The adjust pin is
bypassed to improve the transient response and ripple
rejection of the regulator.
Figure 10. Resistor Divider Scheme for the
Adjustable Version
Stability Considerations
The output or compensation capacitor helps determine
three main characteristics of a linear regulator: satrtup delay,
load transient response and loop stability.
The capacitor value and type is based on cost, availability,
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 manufacturers data sheet
provides this information.
A 22 mF tantalum capacitor will work for most
applications, but with high current regulators such as the
CS5203A the transient response and stability improve with
higher values of capacitor. The majority of applications for
this regulator involve large changes in load current so the
output capacitor must supply the instantaneous load current.
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| Information | Total 10 Pages | |
| Link URL | [ Copy URL to Clipboard ] | |
| Download | [ CS5203A-5.PDF Datasheet ] | |
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Featured Datasheets
| Part Number | Description | MFRS |
| CS5203A-1 | The function is 3.0 A Adjustable/ and Fixed 1.5 V/ 3.3 V and 5.0 V Linear Regulators. ON Semiconductor | |
| CS5203A-2 | The function is 3.0 A Adjustable/ and Fixed 1.5 V/ 3.3 V and 5.0 V Linear Regulators. ON Semiconductor | |
| CS5203A-3 | The function is 3.0 A Adjustable/ and Fixed 1.5 V/ 3.3 V and 5.0 V Linear Regulators. ON Semiconductor | |
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