FAIRCHILD KA278RA05C

www.fairchildsemi.com
KA278RXXC-Series
2A Output Low Dropout Voltage Regulators
Features
Description
KA278RXXC-series (33/05/51/09/12)
The KA278RXXC is a low-dropout voltage regulator suitable for various electronic equipments. It provides
constant voltage power source with TO-220-4 lead full mold
package. The dropout voltage of KA278RXXC is below
0.5V in full rated current(2A). This regulator has various
functions such as a peak current protection, a thermal shut
down, an overvoltage protection .
• 2A/3.3V, 5V, 5.1V, 9V, 12V output low dropout voltage
regulator
• TO-220 full-mold package (4pin)
• Overcurrent protection, thermal shutdown
• Overvoltage protection, short circuit protection
• With output disable function
TO-220F-4L
KA278RA05C
•
•
•
•
•
•
Nominal 5V output without adjusting
Output adjustable between 1.25V and 32V
2A output low dropout voltage regulator
TO-220 full-mold package (4pin)
Overcurrent protection, thermal shutdown
Overvoltage protection, short circuit protection
1
1.Vin 2. Vo 3. GND 4. Vdis - KA278RXXC(33/05/51/09/12)
1.Vin 2. Vo 3. GND 4. Vadj - KA278RA05C
Internal Block Diagram
Vin
Q1
1
OVERVOLTAGE
PROTECTION
THERMAL SHUTDOWN
BANDGAP REFERENCE
2
-
SOA PROTECTION
HIGH / LOW
+
Q1
1
BANDGAP REFERENCE
R1
4
Vin
THERMAL SHUTDOWN
+
Vdis
Vo
2 Vo
OVERVOLTAGE
PROTECTION
Rin
+
SOA PROTECTION
OUTPUT
ON / OFF
4
Vadj
R2
1.4V
SHORTCIRCUIT
PROTECTION
SHORTCIRCUIT
PROTECTION
3
3
GND
GND
(KA278R33/05/51/09/12C)
Rref
(KA278RA05C)
Rev. 1.0.2
©2005 Fairchild Semiconductor Corporation
KA278RXXC-SERIES
Absolute Maximum Ratings
KA278RXXC, KA278RA05C
Parameter
Symbol
Value
Unit
Remark
Vin
35
V
-
Vdis
35
V
-
Io
2.0
A
-
Power dissipation 1
Pd1
1.5
W
No heatsink
Power dissipation 2
Pd2
15
W
With heatsink
Tj
150
°C
-
Operating temperature
Topr
-20 ~ 80
°C
-
Thermal resistance, junction-to case (note2)
Rθjc
2.9
°C/W
-
Thermal resistance, junction-to-air (note2)
Rθja
48.51
°C/W
-
Input voltage
Disable voltage
KA278RXXC
Output current
Junction temperature
2
KA278RXXC-SERIES
Electrical Characteristics
(Vin=Note3, Io=1.0A, Ta=25°C , unless otherwise specified)
Parameter
Output voltage
Symbol
Conditions
Min.
Typ.
Max.
KA278R33C
-
3.22
3.3
3.38
KA278R05C
-
4.88
5
5.12
KA278R51C
-
4.98
5.1
5.22
KA278R09C
Vo
-
8.78
9
9.22
KA278R12C
-
11.7
12
12.3
-
0.1
2.0
V
Load regulation
Rload
Line regulation
Rline
Note4
-
0.5
2.5
%
RR
Note1
45
55
-
dB
Vdrop
Io = 2A
-
-
0.5
V
2.0
-
-
V
0.8
V
Ripple rejection ratio
Dropout voltage
5mA < Io < 2A
Unit
%
Disable voltage high
KA278RXXC
VdisH
Output active
Disable voltage low
KA278RXXC
VdisL
Output disabled
-
-
Disable bias current high KA278RXXC
IdisH
Vdis = 2.7V
-
-
20
µA
Disable bias current low
IdisL
Vdis = 0.4V
-
-
-0.4
mA
Io = 0A
-
-
10
mA
1.24
1.27
1.30
V
KA278RXXC
Quiescent current
Reference voltage
Iq
KA278RA05C
Vref
-
Note:
1.These parameters, although guaranteed, are not 100% tested in production.
2. Junction -to -case thermal resistance test environments.
-. Pneumatic heat sink fixture.
-. Clamping pressure 60psi through 12mm diameter cylinder.
-. Thermal grease applied between PKG and heat sink fixture.
3. KA278R33C : Vin = 5V
KA278R05C : Vin = 7V
KA278R09C : Vin = 11V
KA278R12C : Vin = 15V
4. KA278R33C : Vin =4 to 10V
KA278R05C, KA278R51C : Vin=6 to 12V
KA278R09C : Vin=10 to 25V
KA278R12C : Vin = 13V to 29V
3
KA278RXXC-SERIES
Typical Performance Characteristics
KA278R33C
100
Quiescent current Iq(mA)
4.50
3.75
RL=
3.00
8
Output voltage Vo(V)
5.25
2.25
RL=3.3Ω
1.50
80
60
40
20
RL= ∞
0.75
0
0
0
2
4
6
8
0
5
10
10
15
20
Input voltage Vin(V)
Input voltage Vin (V)
Figure 2. Quiescent Current vs. Input Voltage
5.25
3.36
4.50
3.34
Output voltage Vo(V)
Output voltage Vo(V)
Figure 1. Output Voltage vs. Input Voltage
3.75
3.00
2.25
1.50
3.32
3.30
3.28
3.26
3.24
0.75
0
0
0.5
1
1.5
2
2.5
3.22
-25
3
0
Disable voltage Vdis (V)
Figure 3. Output Voltage vs. Disable Voltage
75
25
50
TEMPERATURE Tj(oC)
100
125
Figure 4. Output Voltage vs. Temperature(Tj)
0.70
0.65
8
Drop out voltage Vdrop [V]
Quiescent current Iq(mA)
10
6
4
2
0
-25
0
25
50
75
100
125
Junction temperature Tj(oC)
Figure 5. Quiescent Current vs. Temperature(Tj)
4
0.60
0.55
0.50
2.0A
0.45
0.40
0.35
0.30
-25
0
25
50
75
100
125
Junction Temp Tj [℃]
Figure 6. Dropout Voltage vs.Junction Temperature
KA278RXXC-SERIES
Typical Performance Characteristics (Continued)
100
Relative output voltage(%)
Power dissipation PD(W)
20
15
10
5
0
-25
80
60
40
20
0
0
75
25
50
TEMPERATURE Tj(oC)
100
125
Figure 7. Power Dissipation vs. Temperature(Tj)
0
1.0
2.0
3.0
4.0
5.0
6.0
Output Current(A)
Figure 8. Overcurrent Protection Characteristics
(Typical Value)
Output peak current Iop (A)
4.75
4.50
4.25
4.00
3.75
3.50
0
1
2
3
4
5
6
Input-output differential voltage Vin-Vo (V)
Figure 9. Output Peak Currenrt vs.
Input-Output Differential Voltage
5
KA278RXXC-SERIES
Typical Performance Characteristics(Continued)
KA278R05C
7
Quiescent current Iq(mA)
100
5
RL=
8
Output voltage Vo(V)
120
6
4
RL=2.5Ω
3
2
80
60
40
20
RL= ∞
1
0
0
5
0
10
0
5
15
10
15
20
Input voltage Vin(V)
Input voltage Vin (V)
Figure 2. Quiescent Current vs. Input Voltage
7
5.06
6
5.04
Output voltage Vo(V)
Output voltage Vo(V)
Figure 1. Output Voltage vs. Input Voltage
5
4
3
2
1
0
5.02
5.00
4.98
4.96
4.94
0
0.5
1
1.5
2
2.5
4.92
-25
3
0
Disable voltage Vdis (V)
100
125
Figure 4. Output Voltage vs. Temperature(Tj)
0.70
8
0.65
Drop out voltage Vdrop [V]
Quiescent current Iq(mA)
Figure 3. Output Voltage vs. Disable Voltage
75
25
50
TEMPERATURE Tj(oC)
6
4
2
0
0.60
0.55
0.50
0.40
0.35
0.30
-25
-25
0
25
50
75
100
125
2.0A
0.45
0
25
50
75
100
125
Junction Temp Tj [℃]
Junction temperature Tj(oC)
Figure 5. Quiescent Current vs. Temperature(Tj)
6
Figure 6. Dropout Voltage vs.Junction Temperature
KA278RXXC-SERIES
Typical Performance Characteristics (Continued)
Relative output voltage(%)
Power dissipation PD(W)
20
15
10
5
0
-25
80
60
40
20
0
0
75
25
50
TEMPERATURE Tj(oC)
100
125
Figure 7. Power Dissipation vs. Temperature(Tj)
0
1.0
2.0
3.0
4.0
5.0
6.0
Output Current(A)
Figure 8. Overcurrent Protection Characteristics
(Typical Value)
Output peak current Iop (A)
4.75
4.50
4.25
4.00
3.75
3.50
0
1
2
3
4
5
6
Input-output differential voltage Vin-Vo (V)
Figure 9. Output Peak Currenrt vs.
Input-Output Differential Voltage
7
KA278RXXC-SERIES
Typical Performance Characteristics (Continued)
KA278R51C
7
Quiescent current Iq(mA)
100
5
RL=
8
Output voltage Vo(V)
120
6
4
RL=2.5Ω
Ω
3
2
80
60
40
20
RL= ∞
1
0
0
5
0
10
0
5
15
10
15
20
Input voltage Vin(V)
Input voltage Vin (V)
Figure 2. Quiescent Current vs. Input Voltage
7
5.16
6
5.14
Output voltage Vo(V)
Output voltage Vo(V)
Figure 1. Output Voltage vs. Input Voltage
5
4
3
2
1
5.12
5.10
5.08
5.06
5.04
0
0
0.5
1
1.5
2
2.5
5.02
-25
3
0
Disable voltage Vdis (V)
Figure 3. Output Voltage vs. Disable Voltage
75
25
50
TEMPERATURE Tj(oC)
100
125
Figure 4. Output Voltage vs. Temperature(Tj)
10
0.65
8
Drop out voltage Vdrop [V]
Quescent current Iq(mA)
0.70
6
4
2
0
-25
0
25
50
75
100
125
Junction temperature Tj(oC)
Figure 5. Quiescent Current vs. Temperature(Tj)
8
0.60
0.55
0.50
2.0A
0.45
0.40
0.35
0.30
-25
0
25
50
75
100
125
Junction Temp Tj [℃]
Figure 6. Dropout Voltage vs. Junction Temperature
KA278RXXC-SERIES
Typical Performance Characteristics (Continued)
100
Relative output voltage(%)
Power dissipation PD(W)
20
15
10
5
80
60
40
20
0
-25
0
0
1.0
Figure 7. Power Dissipation vs. Temperature(Tj)
5.0
6.0
30
25
20
15
10
5
0
-5
-10
-15
-20
-25
Output Voltage
Deviation (mV)
Ripple Rejection RR (dB)
60
50
Input Voltage (V)
40
30
20
Tj = 25 oC
VIN = 7V
IO =1A
∆VIN = 0.5Vrms
10
0.1
10
1
100
8
7
5
0
15
45
Output peak current Iop (A)
Output Voltage
Deviation (V)
4.75
2.0
4.50
4.25
4.00
3.75
3.50
0
35
Figure 10. Line Transient Response
Figure 9. Ripple Rejection vs. Input Ripple Frequency
3.0
2.5
2.0
1.5
1.0
0.5
0.0
-0.5
-1.0
-1.5
-2.0
-2.5
25
Time (µs)
Input Ripple Frequency (KHz)
Output Current (A)
4.0
Figure 8. Overcurrent Protection Characteristics
(Typical value)
70
0
3.0
2.0
Output Current(A)
TEMPERATURE Tj(oC)
0
10
20
30
40
0
1
2
3
4
5
6
Input-output differential voltage Vin-Vo (V)
Time (µs)
Figure 11. Load Transient Response
Figure 12. Output Peak Currenrt vs.
Input-Output Differential Voltage
9
KA278RXXC-SERIES
Typical Performance Characteristics (Continued)
KA278R09C
10
8
Quiescent current Iq(mA)
100
RL=
8
Output voltage Vo(V)
120
6
4
RL=4.5Ω
2
80
60
40
20
RL= ∞
0
0
10
5
0
15
0
20
5
10
15
20
Input voltage Vin(V)
Input voltage Vin (V)
Figure 1. Output Voltage vs. Input Voltage
Figure 2. Quiescent Current vs. Input Voltage
9.12
Output voltage Vo(V)
Output voltage Vo(V)
10
8
6
4
2
9.08
9.04
9.00
8.96
8.92
8.88
0
0
0.5
1
1.5
2
2.5
8.84
-25
3
0
Disable voltage Vdis (V)
Figure 3. Output Voltage vs. Disable Voltage
75
25
50
TEMPERATURE Tj(oC)
100
125
Figure 4. Output Voltage vs. Temperature(Tj)
0.70
0.65
8
Drop out voltage Vdrop [V]
Quescent current Iq(mA)
10
6
4
2
0
0.60
0.55
0.50
0.40
0.35
0.30
-25
-25
0
25
50
75
100
125
2.0A
0.45
0
25
50
75
100
125
Junction Temp Tj [℃]
Junction temperature Tj(oC)
Figure 5. Quiescent Current vs. Temperature(Tj)
Figure 6. Dropout Voltage vs.Junction Temperature
10
KA278RXXC-SERIES
Typical Performance Characteristics (Continued)
100
Relative output voltage(%)
Power dissipation PD(W)
20
15
10
5
0
-25
80
60
40
20
0
0
75
25
50
TEMPERATURE Tj(oC)
100
125
Figure 7. Power Dissipation vs. Temperature(Tj)
0
1.0
2.0
3.0
4.0
5.0
6.0
Output Current(A)
Figure 8. Overcurrent Protection Characteristics
(Typical Value)
Output peak current Iop (A)
4.75
4.50
4.25
4.00
3.75
3.50
0
1
2
3
4
5
6
Input-output differential voltage Vin-Vo (V)
Figure 9. Output Peak Currenrt vs.
Input-Output Differential Voltage
11
KA278RXXC-SERIES
Typical Performance Characteristics (Continued)
120
15.0
100
RL=
Quiescent current Iq(mA)
12.5
8
Output voltage Vo(V)
KA278R12C
10.0
RL= 6Ω
7.5
5.0
80
60
40
20
RL= ∞
2.5
0
0
0
5
10
15
20
0
5
10
15
20
Input voltage Vin(V)
25
Input voltage Vin (V)
Figure 2. Quiescent Current vs. Input Voltage
15.0
Output voltage Vo(V)
Output voltage Vo(V)
Figure 1. Output Voltage vs. Input Voltage
12.5
10.0
7.5
12.04
12.02
12.00
11.98
11.96
5.0
11.94
2.5
0
0
0.5
1
1.5
2
2.5
3
11.92
-25
0
Disable voltage Vdis (V)
Figure 3. Output Voltage vs. Disable Voltage
75
25
50
TEMPERATURE Tj(oC)
100
125
Figure 4. Output Voltage vs. Temperature(Tj)
10
0.65
8
Drop out voltage Vdrop [V]
Quiescent current Iq(mA)
0.70
6
4
2
0
-25
0
25
50
75
100
125
Junction temperature Tj(oC)
Figure 5. Quiescent Current vs. Temperature(Tj)
12
0.60
0.55
0.50
2.0A
0.45
0.40
0.35
0.30
-25
0
25
50
75
100
125
Junction Temp Tj [℃]
Figure 6. Dropout Voltage vs.Junction Temperature
KA278RXXC-SERIES
Typical Performance Characteristics (Continued)
100
Relative output voltage(%)
Power dissipation PD(W)
20
15
10
5
0
-25
80
60
40
20
0
0
75
25
50
TEMPERATURE Tj(oC)
0
100
125
Figure 7. Power Dissipation vs. Temperature(Tj)
1.0
2.0
3.0
4.0
5.0
6.0
Output Current(A)
Figure 8. Overcurrent Protection Characteristics
(Typical Value)
Output peak
peak current
current Iop
Iop (A)
(A)
Output
4.75
4.75
4.50
4.50
4.25
4.25
4.00
4.00
3.75
3.75
3.50
3.50
00
11
22
33
44
55
66
Input-output
Input-outputdifferential
differential voltage
voltageVin-Vo
Vin-Vo(V)
(V)
Figure 9. Output Peak Currenrt vs.
Input-Output Differential Voltage
13
KA278RXXC-SERIES
Typical Performance Characteristics (Continued)
KA278RA05C
7
Quiescent current Iq(mA)
100
5
RL=
8
Output voltage Vo(V)
120
6
4
RL=2.5Ω
Ω
3
2
80
60
40
20
RL= ∞
1
0
0
5
0
10
0
5
15
10
15
20
Input voltage Vin(V)
Input voltage Vin (V)
Figure 1. Output Voltage vs. Input Voltage
Figure 2. Quiescent Current vs. Input Voltage
10
Quiescent current Iq(mA)
Output voltage Vo(V)
5.06
5.04
5.02
5.00
4.98
4.96
8
6
4
2
4.94
4.92
-25
0
0
75
25
50
TEMPERATURE Tj(oC)
100
125
50
75
100
Tj(oC
125
)
20
Power dissipation PD(W)
0.65
Drop out voltage Vdrop [V]
25
Figure 4. Quiescent Current vs. Temperature(Tj)
0.70
0.60
0.55
0.50
2.0A
0.45
0.40
0.35
0
25
50
75
100
125
Junction Temp Tj [℃]
Figure 5. Dropout Voltage vs.Junction Temperature
14
0
Junction temperature
Figure 3. Output Voltage vs. Temperature(Tj)
* Fixed Mode (Vo=5V)
0.30
-25
-25
15
10
5
0
-25
0
75
25
50
TEMPERATURE Tj(oC)
100
125
Figure 6. Power Dissipation vs. Temperature(Tj)
KA278RXXC-SERIES
Typical Performance Characteristics (Continued)
4.75
80
Output peak current Iop (A)
Relative output voltage(%)
100
60
40
20
4.50
4.25
4.00
3.75
3.50
0
0
1.0
2.0
3.0
4.0
5.0
6.0
0
1
2
3
4
5
6
Input-output differential voltage Vin-Vo (V)
Output Current(A)
Figure 7. Overcurrent Protection
Characteristics(Typical value)
Figure 8. Output Peak Currenrt vs.
Input-Output Differential Voltage
15
KA278RXXC-SERIES
Typical Application
KA278R33/05/51/09/12C
Vo
Vin
1
2
+
+
3
GND
4
Vdis
Disable Signal
Figure 1. Application Circuit
• Ci is required if regulator is located at an appreciable distance from power supply filter.
• Co improves stability and transient response.(Co > 47µF)
KA278RA05
Output
Input
Vo 2
1 Vin
KA278RA05
GND
Ci
3
R3
Vadj 4
Co
RL
R4
R1//R3
) R1 = 1.8kΩ , R2 = 0.6kΩ
R2//R4
Vo = 1.25 ( 1 +
Figure 2. Application Circuit (Adjustable Mode)
• Ci is required if regulator is located at an appreciable distance from power supply filter.
• Co improves stability and transient response.(CO > 47µF)
25
20
Variation(%)
15
10
5
0
-5
-10
-50
-25
0
50
25
75
100
125
Junction temperature Tj(℃)
Figure 3. Internal Resistor(R1,R2) Variation vs. Temperature(Tj)
Output = 5V
Input
Vo
1 Vin
2
KA278RA05
Ci
GND
3
Vadj
4
Co
RL
Figure 4. Application Circuit (Fixed Mode)
16
KA278RXXC-SERIES
Mechanical Dimensions
Package
Dimensions in millimeters
TO-220F-4L
17
KA278RXXC-SERIES
Mechanical Dimensions (Continued)
Package
Dimensions in millimeters
TO-220F-4L(Forming)
18
KA278RXXC-SERIES
Mechanical Dimensions (Continued)
Package
Dimensions in millimeters
TO-220F-4L(Short Lead)
NOTE
1. THESE DIMENSIONS DO NOT INCLUDE MOLD PROTRUSION.
2. ( ) IS REFERENCE
3. [ ] IS ASS'Y OUT QUALITY
TITLE
PKG OUTLINE
TO-220F-4L , SHORT LEAD
TOLERANCE
UNIT
mm
DWG. NO.
N/A
D
SCALE
5:1
SPEC NO.
19
KA278RXXC-SERIES
Ordering Information
Product Number
Package
Operating Temperature
KA278R33CTU
KA278R05CTU
KA278R51CTU
KA278R09CTU
TO-220F-4L
KA278R12CTU
KA278RA05CTU
KA278R33CYDTU
-20°C to +80°C
KA278R05CYDTU
KA278R09CYDTU
TO-220F-4L(Forming)
KA278R12CYDTU
KA278RA05CYDTU
KA278R33CTSTU
KA278R05CTSTU
TO-220F-4L(Short Lead)
KA278R12CTSTU
DISCLAIMER
FAIRCHILD SEMICONDUCTOR RESERVES THE RIGHT TO MAKE CHANGES WITHOUT FURTHER NOTICE TO ANY
PRODUCTS HEREIN TO IMPROVE RELIABILITY, FUNCTION OR DESIGN. FAIRCHILD DOES NOT ASSUME ANY
LIABILITY ARISING OUT OF THE APPLICATION OR USE OF ANY PRODUCT OR CIRCUIT DESCRIBED HEREIN; NEITHER
DOES IT CONVEY ANY LICENSE UNDER ITS PATENT RIGHTS, NOR THE RIGHTS OF OTHERS.
LIFE SUPPORT POLICY
FAIRCHILD’S PRODUCTS ARE NOT AUTHORIZED FOR USE AS CRITICAL COMPONENTS IN LIFE SUPPORT DEVICES
OR SYSTEMS WITHOUT THE EXPRESS WRITTEN APPROVAL OF THE PRESIDENT OF FAIRCHILD SEMICONDUCTOR
CORPORATION. As used herein:
1. Life support devices or systems are devices or systems
which, (a) are intended for surgical implant into the body,
or (b) support or sustain life, and (c) whose failure to
perform when properly used in accordance with
instructions for use provided in the labeling, can be
reasonably expected to result in a significant injury of the
user.
2. A critical component in any component of a life support
device or system whose failure to perform can be
reasonably expected to cause the failure of the life support
device or system, or to affect its safety or effectiveness.
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2/18/05 0.0m 001
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 2005 Fairchild Semiconductor Corporation