SECOS SSC2156

SSC2156
600mA CMOS
Elektronische Bauelemente
Positive Voltage Regulator
RoHS Compliant Product
Description
The SSC2156 positive,linear regulators feature low ground
current (30µA typ.) with low dropout voltage, making them ideal
for battery applications. The space-saving SOP-8 package is
attractive for "Pocket" and "Hand Held" applications.These
rugged devices have both Thermal Shutdown and Current
Fold-back to prevent device failure under the "Worst" of operating
conditions. The SSC2156 is stable with an output capacitance
of 2.2µF or greater.
Features
* Low Temperature Coefficient
* Over-Temperature Shutdown
* User Adjustable Output Voltages
* Very Low Dropout Voltage
* Accurate to within 1.5%
* Guaranteed 600mA output
* Current Limiting
* Power-Saving Shutdown Mode
* Short Circuit Current Fold-back
REF.
A
B
C
D
E
F
Millimeter
Min.
Max.
5.80
4.80
3.80
0
0.40
0.19
6.20
5.00
4.00
8
0.90
0.25
REF.
M
H
L
J
K
G
Millimeter
Min.
Max.
0.10
0.25
0.35
0.49
1.35
1.75
0.375 REF.
45
1.27 TYP.
Applications
* PC Peripherals
* Wireless Devices
* Portable Electronics
* Battery Powered Widgets
* Instrumentation
Functional Block Diagram
* Cordless Phones
Typical Application Circuit
SSC2156
VOUT=1.215*(1+R1/R2)
C2 is unnecessary if R1 or R2 < 20KΩ
R1 and R2 usd resistance vlaue within 1% accuracy
for correct VOUT
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01-Jun-2002 Rev. A
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Page 1 of 7
SSC2156
600mA CMOS
Elektronische Bauelemente
Positive Voltage Regulator
Absolute Maximum Ratings
Parameter
VIN
Output Current
IOUT
Output Voltage
VOUT
Operating Ambient Temperature
Topr
Max. Junction Temperature
T=100 C)
V
PD/(VIN-VO)
mA
V
o
C
-40~+85
o
C
-40~+125
150
Tj Max.
o
Unit
8
Gnd-0.3 to VIN+0.3
Tj
Junction Temperature
Power Dissipation (
Ratings
Symbol
Input Voltage
o
C
mW
810
PD
EDS Classification
B
o
Electrical Characteristics Ta=25 C unless otherwise noted
Parameter
Symbol
1
Typ.
VOUT (T)
2
Output Voltage
VOUT (E)
-1.5%
Output Current
IO
600
_
Current Limit
ILIM
600
800
Load Regulation
Dropout Voltage
REGLOAD
VDROPOUT
Ground Pin Current
Line Regulation
IGND
REGLINE
Input Voltage
Over Temperature Shutdown
Over Temperature Hystersis
Output Voltage
Temperature Coefficient
Power Supply Rejection
_
0.2
_
_
_
_
_
_
_
30
_
_
EN Input Threshold
EN Input Bias Current
Unit
V
1.5%
_
_
mA
mA
1
%
800
mV
600
_
_
0.15
0.02
0.1
uA
%
_
7
OTS
_
150
_
o
o
OTH
TC
PSRR
_
30
_
_
30
_
_
50
_
20
15
_
eN
_
30
_
VEH
2
_
VEL
IEH
0
_
_
IEL
_
_
30
_
_
VIN
0.4
0.1
0.5
VO>1.2V
VIN=VOUT(T)+2V,IO=1mA~600mA
2.0V<VOUT(T) ≤ 2.8V
Io=600mA
Vo=VOUT(E)-2%
VIN=VOUT(T)+2V,IO=1mA~600mA
Io=1mA
VOUT(T)< 2.0V
VIN=VOUT(T)+ 1
2.0V≥VOUT(T)
to VOUT(T)+2
V
C
C
ppm/ oC
_
_
IO=1mA,VIN=VOUT(T)+2V
VO>1.2V
2.8V<VOUT(T)
Note
3
Condition
1.5V<VOUT(T) ≤ 2.0V
1400
VIN
_
Output Voltage Noise
Max.
Min.
f=1kHz
dB
uVrms
V
uA
Short Circuit Current
ISC
_
Shutdown Supply Current
ISD
_
300
600
mA
ADJ Reference Voltage
VREF
1.203
1.215
1.227
V
f=10kHz
IO=100mA
Co=2.2uF
f=100kHz
f=10Hz~100kHz, Io=10mA
CO=2.2uF
VIN=2.7V to 7V
VEN=VIN,VIN=2.7V~7V
VEN=0V,VIN=2.7V~7V
VIN=VOUT(T)+1V,VO<0.8V
VIN=5V,VO=0,VEN<VEL
Note 1: VOUT (E) =Effective Output Voltage (i.e. the output voltage when "VOUT (T) +2.0V" is provided at the VIN pin while maintaining a
certain IOUT value).
2: VOUT (T) =Specified Output Voltage
3: VIN (MIN) =VOUT+V DROPOUT
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01-Jun-2002 Rev. A
Any changing of specification will not be informed individual
Page 2 of 7
SSC2156
600mA CMOS
Elektronische Bauelemente
Positive Voltage Regulator
Ordering Information(contd.)
Part Number
SSC2156-AD
Marking
Output Voltage
6EAD2
XXXX
Adjustable
Part Number
Marking
Output Voltage
Detailed Description
The SSC2156 of COMS regulators contain a PMOS pass transistor,voltage reference, error amplifier,over-current protection and thermal
shutdown.The P-channel pass transistor receives data from the error amplifier, over-current shutdown, and thermal protection circuits.
During normal operation, the error amplifier compares the output voltage to a precision reference. Over-current and Thermal shutdown circuits
o
become active when the junction temperature exceeds150 C, or the current exceeds 600mA. During thermal shutdown, the output voltage
remains low. Normal operation is restored when the junction temperature drops below 120o C. The SSC2156 switches from voltage mode
when the load exceeds the rated output current.This prevents over-stress. The SSC2156 also incorporates current fold-back to reduce
power dissipation when the output is short circuited. This feature becomes active when the output drops below 0.8V, and reduces the
current flow by 65%. Full current is restored when the voltage exceeds 0.8V.
External Capacitors
The SSC2156 is stable with an output capacitance to ground of 2.2uF or greater. Ceramic capacitors have the lowest ESR, and will
offer the best AC performance. Conversely, Aluminum Electrolytic capacitors exhibit the highest ESR, resulting in the poorest AC
response. Unfortunately, large value ceramic capacitors are comparatively expensive. One option is to parallel a 0.1uF ceramic
capacitor with a 10uF Aluminum Electrolytic. The benefit is low ESR, high capacitance, and low overall cost. A second capacitor is
recommended between the input and ground to stabilize VIN. The input capacitor should be at least 0.1uF to have a beneficial
effect. All capacitors should be placed in closed proximity to the pins. A "Quiet" ground termination is desirable. This can be
achieved with a "Star" connection.
Enable
The Enable pin normally floats high. When actively, pulled low, the PMOS pass transistor shuts off, and all internal circuits are powered
down. In this state, the quiescent current is less than 1uA. This pin behaves much like an electronic switch.
ADJ
The ADJ pin is the positive input to the error amplifier which, due to the PMOS pass element inversion, means it is actually the negative
input of the LDO feedback loop. The feedback works to keep the voltage at the ADJ pin 1.215V with respect to ground. Since the internal
circutry at the ADJ pin is essentially an ESD protected CMOS gate the input current at the ADJ pin is virtually zero.
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01-Jun-2002 Rev. A
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Page 3 of 7
SSC2156
600mA CMOS
Elektronische Bauelemente
Positive Voltage Regulator
Characteristics Curve
http://www.SeCoSGmbH.com/
01-Jun-2002 Rev. A
Any changing of specification will not be informed individual
Page 4 of 7
SSC2156
600mA CMOS
Elektronische Bauelemente
http://www.SeCoSGmbH.com/
01-Jun-2002 Rev. A
Positive Voltage Regulator
Any changing of specification will not be informed individual
Page 5 of 7
SSC2156
600mA CMOS
Elektronische Bauelemente
Positive Voltage Regulator
External Resistor Divider Table
R1(K Ohm)
1
2
VOUT
3
4
5
6
7
8
9
10
R2(K Ohm)=(1.215*R1(K Ohm))/(VOUT-1.215)
1.30
14.29
28.59
42.88
57.18
71.47
85.76
100.06
114.35
128.65
142.94
1.35
9.00
18.00
27.00
36.00
45.00
54.00
63.00
72.00
81.00
90.00
1.40
6.57
13.14
19.70
26.27
32.84
39.41
45.97
52.54
59.11
65.68
1.45
5.17
10.34
15.51
20.68
25.85
31.02
36.19
41.36
46.53
51.70
1.50
4.26
8.53
12.79
17.05
21.32
25.58
29.84
34.11
38.37
42.63
1.55
3.63
7.25
10.88
14.51
18.13
21.76
25.39
29.01
32.64
36.27
1.60
3.16
6.31
9.47
12.62
15.78
18.94
22.09
25.25
28.40
31.56
1.65
2.79
5.59
8.38
11.17
13.97
16.76
19.55
22.34
25.14
27.93
1.70
2.51
5.01
7.52
10.02
12.53
15.03
17.54
20.04
22.55
25.05
1.75
2.27
4.54
6.81
9.08
11.36
13.63
15.90
18.17
20.44
22.71
1.80
2.08
4.15
6.23
8.31
10.38
12.46
14.54
16.62
18.69
20.77
1.85
1.91
3.83
5.74
7.65
9.57
11.48
13.39
15.31
17.22
19.13
1.90
1.77
3.55
5.32
7.09
8.87
10.64
12.42
14.19
15.96
17.74
1.95
1.65
3.31
4.96
6.61
8.27
9.92
11.57
13.22
14.88
16.53
2.00
1.55
3.10
4.64
6.19
7.74
9.29
10.83
12.38
13.93
15.48
2.05
1.46
2.91
4.37
5.82
7.28
8.73
10.19
11.64
13.10
14.55
2.10
1.37
2.75
4.12
5.49
6.86
8.24
9.61
10.98
12.36
13.73
2.15
1.30
2.60
3.90
5.20
6.50
7.80
9.10
10.40
11.70
12.99
2.20
1.23
2.47
3.70
4.93
6.17
7.40
8.63
9.87
11.10
12.34
2.25
1.71
2.35
3.52
4.70
5.87
7.04
8.22
9.39
10.57
11.74
2.30
1.12
2.24
3.36
4.48
5.60
6.72
7.84
8.96
10.08
11.20
2.35
1.07
2.14
3.21
4.28
5.35
6.42
7.49
8.56
9.63
10.70
2.40
1.03
2.05
3.08
4.10
5.13
6.15
7.18
8.20
9.23
10.25
2.45
0.98
1.97
2.95
3.94
4.92
5.90
6.89
7.87
8.85
9.84
2.50
0.95
1.89
2.84
3.78
4.73
5.67
6.62
7.56
8.51
9.46
2.55
0.91
1.82
2.73
3.64
4.55
5.46
6.37
7.28
8.19
9.10
2.60
0.88
1.75
2.63
3.51
4.39
5.26
6.14
7.02
7.90
8.77
2.65
0.85
1.69
2.54
3.39
4.23
5.08
5.93
6.77
7.62
8.47
2.70
0.82
1.64
2.45
3.27
4.09
4.91
5.73
6.55
7.36
8.18
2.75
0.79
1.58
2.37
3.17
3.96
4.75
5.54
6.33
7.12
7.92
2.80
0.77
1.53
2.30
3.07
3.83
4.60
5.37
6.13
6.90
7.67
2.85
0.74
1.49
2.23
2.97
3.72
4.46
5.20
5.94
6.69
7.43
2.90
0.72
1.44
2.16
2.88
3.61
4.33
5.05
5.77
6.49
7.21
2.95
0.70
1.40
2.10
2.80
3.50
4.20
4.90
5.60
6.30
7.00
3.00
0.68
1.36
2.04
2.72
3.40
4.08
4.76
5.45
6.13
6.81
3.05
0.66
1.32
1.99
2.65
3.31
3.97
4.63
5.30
5.96
6.62
3.10
0.64
1.29
1.93
2.58
3.22
3.87
4.51
5.16
5.80
6.45
3.15
0.63
1.26
1.88
2.51
3.14
3.77
4.40
5.02
5.65
6.28
3.20
0.61
1.22
1.84
2.45
3.06
3.67
4.28
4.90
5.51
6.12
3.25
0.60
1.19
1.79
2.39
2.99
3.58
4.18
4.78
5.37
5.97
3.30
0.58
1.17
1.75
2.33
2.91
3.50
4.08
4.66
5.24
5.83
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01-Jun-2002 Rev. A
Any changing of specification will not be informed individual
Page 6 of 7
SSC2156
600mA CMOS
Elektronische Bauelemente
Positive Voltage Regulator
External Resistor Divider Table
R1(K Ohm)
1
2
VOUT
3
4
5
6
7
8
9
10
R2(K Ohm)=(1.215*R1(K Ohm))/(VOUT-1.215)
3.35
0.57
1.14
1.71
2.28
2.85
3.41
3.98
4.55
5.12
5.69
3.40
3.45
0.56
1.11
1.67
2.22
2.78
3.34
3.89
4.45
5.00
5.56
0.54
1.09
1.63
2.17
2.72
3.26
3.81
4.35
4.89
5.44
3.50
0.53
1.06
1.60
2.13
2.66
3.19
3.72
4.25
4.79
5.32
3.55
0.52
1.04
1.56
2.08
2.60
3.12
3.64
4.16
4.68
5.20
3.60
0.51
1.02
1.53
2.04
2.55
3.06
3.57
4.08
4.58
5.09
3.65
0.50
1.00
1.50
2.00
2.49
2.99
3.49
3.99
4.49
4.99
3.70
0.49
0.98
1.47
1.96
2.44
2.93
3.42
3.91
4.40
4.89
3.75
0.48
0.96
1.44
1.92
2.40
2.88
3.36
3.83
4.31
4.79
3.80
0.47
0.94
1.41
1.88
2.35
2.82
3.29
3.76
4.23
4.70
3.85
0.46
0.92
1.38
1.84
2.31
2.77
3.23
3.69
4.15
4.61
3.90
0.45
0.91
1.36
1.81
2.26
2.72
3.17
3.62
4.07
4.53
3.95
0.44
0.89
1.33
1.78
2.22
2.67
3.11
3.55
4.00
4.44
4.00
0.44
0.87
1.31
1.75
2.18
2.62
3.05
3.49
3.93
4.36
4.05
0.43
0.86
1.29
1.71
2.14
2.57
3.00
3.43
3.86
4.29
4.10
0.42
0.84
1.26
1.68
2.11
2.53
2.95
3.37
3.79
4.21
4.15
0.41
0.83
1.24
1.66
2.07
2.48
2.90
3.31
3.73
4.14
4.20
0.41
0.81
1.22
1.63
2.04
2.44
2.85
3.26
3.66
4.07
4.25
0.40
0.80
1.20
1.60
2.00
2.40
2.80
3.20
3.60
4.00
4.30
0.39
0.79
1.18
1.58
1.97
2.36
2.76
3.15
3.54
3.94
4.35
0.39
0.78
1.16
1.55
1.94
2.33
2.71
3.10
3.49
3.88
4.40
0.38
0.76
1.14
1.53
1.91
2.29
2.67
3.05
3.43
3.81
4.45
0.38
0.75
1.13
1.50
1.88
2.25
2.63
3.00
3.38
3.76
4.50
0.37
0.74
1.11
1.48
1.85
2.22
2.59
2.96
3.33
3.70
4.55
0.36
0.73
1.09
1.46
1.82
2.19
2.55
2.91
3.28
3.64
4.60
0.36
0.72
1.08
1.44
1.79
2.15
2.51
2.87
3.23
3.59
4.65
0.35
0.71
1.06
1.41
1.77
2.12
2.48
2.83
3.18
3.54
4.70
0.35
0.70
1.05
1.39
1.74
2.09
2.44
2.79
3.14
3.49
4.75
0.34
0.69
1.03
1.37
1.72
2.06
2.41
2.75
3.09
3.44
4.80
0.34
0.68
1.02
1.36
1.69
2.03
2.37
2.71
3.05
3.39
4.85
0.33
0.67
1.00
1.34
1.67
2.01
2.34
2.67
3.01
3.34
4.90
0.33
0.66
0.99
1.32
1.65
1.98
2.31
2.64
2.97
3.30
4.95
0.33
0.65
0.98
1.30
1.63
1.95
2.28
2.60
2.93
3.25
5.00
0.32
0.64
0.96
1.28
1.61
1.93
2.25
2.57
2.89
3.21
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01-Jun-2002 Rev. A
Any changing of specification will not be informed individual
Page 7of 7