Datasheet

UNISONIC TECHNOLOGIES CO., LTD
278RXX
LINEAR INTEGRATED CIRCUIT
4 TERMINAL 2A OUTPUT
LOW DROP VOLTAGE
REGULATOR

DESCRIPTION
1
The UTC 278RXX Series are Low Drop Voltage Regulator
suitable for various electronic equipments.
It provides constant voltage power source with TO-220F-4
terminal lead full molded PKG. The Regulator has multi function
such as over current protection, overheat protection and ON/OFF
control.

TO-220F-4
FEATURES
* 2.0A Output Low Drop Voltage Regulator.
* Built in ON/OFF Control Terminal.
* Built in Over Current Protection, Over Heat Protection Function.

ORDERING INFORMATION
Note:
Ordering Number
Lead Free
Halogen Free
278RXXL-TF4-T
278RXXG-TF4-T
xx: Output Voltage, refer to Marking Information.
278RXXL-TF4-T
Package
Packing
TO-220F-4
Tube
(1)Packing Type
(1) T: Tube
(2)Package Type
(2) TF4: TO-220F-4
(3)Green Package
(3) L: Lead Free, G: Halogen Free and Lead Free
(4)Voltage Code
(4) XX: Refer to Marking Information
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
LINEAR INTEGRATED CIRCUIT
MARKING INFORMATION
PACKAGE
VOLTAGE CODE
TO-220F-4
05: 5.0V
08: 8.0V
12: 12V
33: 3.3V

PIN CONFIGURATION

PIN DESCRIPTION
PIN NO.
1
2
3
4
PIN NAME
VIN
VOUT
GND
Control
MARKING
DESCRIPTION
Input DC supply voltage
Output voltage pin
Ground pin for the IC
ON/OFF control pin
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
LINEAR INTEGRATED CIRCUIT
BLOCK DIAGRAM
VIN 1
2 VO
BANDGAP
REFERENCE
Control 4
ASO
PROTECTION
OUTPUT ON/OFF
CONTROL
OVER HEAT
PROTECTION
3
GND
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
LINEAR INTEGRATED CIRCUIT
ABSOLUTE MAXIMUM RATING (TA=25°C, unless otherwise specified)
PARAMETER
SYMBOL
REMARK
RATINGS
UNIT
Input Voltage
VIN
35
V
ON/OFF Control Voltage
VC
35
V
Output Current
IO
2
A
Power Dissipation 1
PD1
No heatsink
1.5
W
Power Dissipation 2
PD2
with heatsink
15
W
Junction Temperature
TJ
125
°C
Operating Temperature
TOPR
-20~80
°C
Storage Temperature
TSTG
-30~125
°C
Soldering Temperature (10sec)
TSOL
260
°C
Note: Absolute maximum ratings are those values beyond which the device could be permanently damaged.
Absolute maximum ratings are stress ratings only and functional device operation is not implied.

ELECTRICAL CHARACTERISTICS (TA=25°C, IO=1.0A, unless otherwise specified)
For 278R05 (VIN=7V)
PARAMETER
Output Voltage
Load Regulation
Line Regulation
Temperature Coefficient of Output Voltage
Ripple Rejection
Drop Out Voltage (Note)
Output ON State for Control Voltage
Output ON State for Control Current
Output OFF State for Control Voltage
Output OFF State for Control Current
Quiescent Current
SYMBOL
VO
Reg Load
Reg Line
TC VO
R·R
VD
VC(ON)
IC(ON)
VC(OFF)
IC(OFF)
IQ
For 278R08 (VIN=10V)
PARAMETER
Output Voltage
Load Regulation
Line Regulation
Temperature Coefficient of Output Voltage
Ripple Rejection
Drop Out Voltage (Note)
Output ON State for Control Voltage
Output ON State for Control Current
Output OFF State for Control Voltage
Output OFF State for Control Current
Quiescent Current
SYMBOL
VO
Reg Load
Reg Line
TC VO
R·R
VD
VC(ON)
IC(ON)
VC(OFF)
IC(OFF)
IQ
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TEST CONDITIONS
MIN
4.875
IO=5mA~2A
VIN=6~12V
TJ=0~125°C
45
IO=2A
TYP
MAX
5.0
5.125
0.1
2.0
0.5
2.5
±0.02 ±0.05
55
0.5
2.0
VC=2.7V
20
0.8
-0.4
10
VC=0.4V
IO=0
TEST CONDITIONS
MIN
7.800
IO=5mA~2A
VIN=9~15V
TJ=0~125°C
45
IO=2A
TYP
MAX
8.0
8.200
0.1
2.0
0.5
2.5
±0.02 ±0.05
55
0.5
2.0
VC=2.7V
VC=0.4V
IO=0
20
0.8
-0.4
10
UNIT
V
%
%
%/°C
dB
V
V
μA
V
mA
mA
UNIT
V
%
%
%/°C
dB
V
V
μA
V
mA
mA
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LINEAR INTEGRATED CIRCUIT
ELECTRICAL CHARACTERISTICS (Cont.)
For 278R12 (VIN=18V)
PARAMETER
Output Voltage
Load Regulation
Line Regulation
Temperature Coefficient of Output Voltage
Ripple Rejection
Drop Out Voltage (Note)
Output ON State for Control Voltage
Output ON State for Control Current
Output OFF State for Control Voltage
Output OFF State for Control Current
Quiescent Current
SYMBOL
VO
Reg Load
Reg Line
TC VO
R·R
VD
VC(ON)
IC(ON)
VC(OFF)
IC(OFF)
IQ
TEST CONDITIONS
MIN
11.70
IO=5mA~2A
VIN=13~29V
TJ=0~125°C
45
IO=2A
TYP
MAX
12.0
12.30
0.1
2.0
0.5
2.5
±0.02 ±0.05
55
0.5
2.0
VC=2.7V
VC=0.4V
IO=0
20
0.8
-0.4
10
For 278R33 (VIN=5V)
PARAMETER
SYMBOL
TEST CONDITIONS
MIN
TYP
MAX
Output Voltage
VO
3.218
3.3
3.383
Load Regulation
Reg Load IO=5mA~2A
0.1
2.0
Line Regulation
Reg Line VIN=6~12V
0.5
2.5
±0.02 ±0.05
Temperature Coefficient of Output Voltage
TC VO
TJ=0~125°C
R·R
Ripple Rejection
45
55
Drop Out Voltage (Note)
VD
IO=2A
0.5
Output ON State for Control Voltage
VC(ON)
2.0
Output ON State for Control Current
IC(ON)
VC=2.7V
20
Output OFF State for Control Voltage
VC(OFF)
0.8
Output OFF State for Control Current
IC(OFF)
VC=0.4V
-0.4
Quiescent Current
IQ
IO=0
10
Note: Input voltage shall be the value when output voltage is 95% in comparison with the initial value.
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UNIT
V
%
%
%/°C
dB
V
V
μA
V
mA
mA
UNIT
V
%
%
%/°C
dB
V
V
μA
V
mA
mA
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QW-R102-048.D
278RXX

LINEAR INTEGRATED CIRCUIT
TEST CIRCUIT
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
LINEAR INTEGRATED CIRCUIT
TYPICAL APPLICATION CIRCUIT
VIN
1
2
VO
CO
Specific IC
L
o
a
d
3
4
ON/OFF
Signal
High or Open:Output ON
Low :Output OFF
CMOS or TTL
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TYPICAL CHARACTERISTICS
Dynamic Load Response
Dynamic Load Response
CH1: 2V/div)
CH2: 20mV
VIN=5V, IO=5mA~3A,
Ton=10ms, Toff=10ms
CH1=VIN
0
CH2=VOUT
CH3: 2.5A/div
CH3: 2.5A/div
CH1: 2V/div)
CH2: 20mV
VIN=5V, IO=5mA~2A,
Ton=10ms, Toff=10ms
CH3=IO
0
0
10
Time (2ms/div)
20
CH1=VIN
0
CH2=VOUT
CH3=IO
0
0
Power Supply Rejection
CH2=VOUT
VIN=5V, △Vip=0.5V(rms), f=1KHz
0
5
Time (1ms/div)
10
CH1: 500mV/div
0
20
CH1=VIN
0
CH2: 10mV/div
CH1: 500mV/div
0
10
Time (2ms/div)
Power Supply Rejection
CH1=VIN
CH2: 10mV/div

LINEAR INTEGRATED CIRCUIT
0
CH2=VOUT
VIN=5V, △Vip=0.5V(rms), f=1KHz
0
5
Time (1ms/div)
10
UTC assumes no responsibility for equipment failures that result from using products at values that
exceed, even momentarily, rated values (such as maximum ratings, operating condition ranges, or
other parameters) listed in products specifications of any and all UTC products described or contained
herein. UTC products are not designed for use in life support appliances, devices or systems where
malfunction of these products can be reasonably expected to result in personal injury. Reproduction in
whole or in part is prohibited without the prior written consent of the copyright owner. The information
presented in this document does not form part of any quotation or contract, is believed to be accurate
and reliable and may be changed without notice.
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www.unisonic.com.tw
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