SECOS SQ2143

SQ2143
CMOS Positive
Voltage Regulator
Elektronische Bauelemente
RoHS Compliant Product
Description
The SQ2143 series of positive,linear regulators feature low quiescent
current (35µA typ.) with low dropout voltage, making them ideal
for battery applications. These rugged devices have both Thermal Shutdown,
and Current Fold-back to prevent device failure under the "Worst" of
operating conditions.
The SQ2143 is stable with an output capacitance of 2.2µF or greater.
Features
* High Accurate ± 1.5%
* Over-Temperature Shutdown
* Adjustable Output Voltage
* Very Low Dropout Voltage
* Low Temperature Coefficient
* Short Circuit Current Fold-back
* Guaranteed 300mA output
REF.
A
B
C
D
E
F
Millimeter
Min.
Max.
2.70
3.10
2.60
3.00
1.40
1.80
0.30
0.55
0
0.10
0°
10°
REF.
G
H
I
J
K
L
Dimensions
Millimeter
1.90 REF.
1.20 REF.
0.12 REF.
0.37 REF.
0.60 REF.
0.95 REF.
* Current Limiting
Applications
D
* PC Peripherals
* Wireless Devices
* Portable Electronics
* Battery Powered Widgets
* Electronic Scales
Functional Block Diagram
* Instrumentation
* Cordless Phones
Typical Application Circuit
SQ2143
http://www.SeCoSGmbH.com/
01-Jun-2002 Rev. A
Any changing of specification will not be informed individual
Page 1 of 8
SQ2143
CMOS Positive
Elektronische Bauelemente
Voltage Regulator
Absolute Maximum Ratings
Parameter
Ratings
Symbol
Input Voltage
VIN
Output Current
IOUT
Input, Output Voltage
V
PD/(VIN-VO)
mA
V
GND-0.3 to VIN+0.3
Topr
Operating Ambient Temperature
o
T=100 C)
C
o
C
-40~+125
150
Tj Max.
Max. Junction Temperature
Thermal Resistance
o
-40~+85
Tj
Junction Temperature
Power Dissipation (
EDS Classification
Unit
8
θja
260
PD
380
B
o
C
o
C /W
mW
o
Electrical Characteristics Ta=25 C unless otherwise noted
Parameter
Symbol
Min.
-1.5%
Output Voltage
VO
Ground Pin Current
Output Current
IGND
_
Io
Current Limit
ILIM
Load Regulation
Dropout Voltage
REGLOAD
VDROPOUT
Input Voltage
REGLINE
VIN
Over Temperature Shutdown
OTS
Over Temperature Hystersis
Output Voltage
Temperature Coefficient
Short Circuit Current 2
OTH
Power Supply Rejection
Output Voltage Noise
EN Input Threshold
EN Input Bias Current
TC
ISC
PSRR
eN
VEH
VEL
IEH
IEL
_
Max.
1.5%
300
_
_
300
450
_
0.2
1
%
_
1300
400
300
mV
_
_
_
_
_
_
_
1
Note
0.15
0.02
0.1
_
7
mA
o
_
30
_
ppm/ oC
_
150
300
mA
_
60
_
_
_
50
_
20
_
_
30
_
2
0
_
_
_
_
_
_
0.5
ISD
_
Shutdown Output Voltage
Vo,SD
0
_
_
VIN
0.4
0.1
0.5
2.0V <VON(NOM) ≤ 2.8V
Vo=VON(NOM)-2%
2.8V<VON(NOM)<3.8V
Vo<2.0V
Vo≥ 2.0V
Io=5mA
VIN=VOUT(T)+1
to VOUT(T)+2
C
C
VIN=5V,VOUT<0.8V
f=100Hz
dB
f=1kHz
f=10kHz
uVrms
Co=2.2uF
VIN=5V
Io=100mA
Co=2.2uF
f=10Hz~100kHz
Io=10mA
CBYP=0uF
V
VIN=2.7V to 7V
uA
VEN=VIN,VIN=2.7V to 7V
VEN=0V,VIN=2.7V to 7V
1
uA
VIN=5V,Vo=0V,VEN<VEL
0.1
V
Io=35uA ,VEN<VEL
85
% VON(NOM)
% VON(NOM)
Output Under Voltage
VUV
_
Output Over Voltage
VOV
115
ADJ Input Bias Current
IADJ
_
1.0
_
ADJ Reference Voltage
VREF
1.2
1.215
1.23
_
V IN=5V,Io>1.2
VIN=5V,Io=1mA~300mA
1.5V< VON(NOM) ≤ 2.0V Io=300mA
V
_
150
V IN=5V,Io>1.2
%
30
_
VIN=5V,Io=1mA~300mA
mA
o
Shutdown Supply Current
Note:
uA
_
_
VIN=5V,Io=1mA
V
_
_
Condition
Unit
35
_
Line Regulation
Typ.
_
uA
V
1.VIN(MON)=VOUT+VDROPOUT
2.To prevent the Short Current protection feature from being prematurely activated,
the input voltage must be applied before a current source loas is applied.
http://www.SeCoSGmbH.com/
01-Jun-2002 Rev. A
Any changing of specification will not be informed individual
Page 2 of 8
SQ2143
CMOS Positive
Elektronische Bauelemente
Voltage Regulator
Ordering Information(contd.)
Part Number
Marking
SQ2143-AD
3DAD2
XXXX
Output Voltage
Part Number
Marking
Output Voltage
Adjustable
Detailed Description
The SQ2143 of COMS regulators contain a PMOS pass transistor,voltage reference, error amplifier,over-current protection and
thermal shutdown and Power Good function. 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.
o
Over-current and Thermal shutdown circuits become active when the junction temperature exceeds150 C, or the current exceeds 300mA.
During thermal shutdown, the output voltage remains low. Normal operation is restored when the junction temperature drops below 120oC.
The SQ2143 switches from voltage mode to current mode when the load exceeds the rated output current. This prevents over-stress.
The SQ2143 also incorporates current fold-back to reduce power dissipation when the output is short circuited.This feature becomes active
when the output drops below 0.8 volts, and reduces the current flow by 65%. Full current is restored when the voltage exceeds 0.8 volts.
External Capacitors
The SQ2143 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 Elertrolytic 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 0.1 uF ceramic capacitor with a
10 uF 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 close proximity to the pins. A "Quiet" ground termination is desirable . The 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.
ht tp://www.SeCoSGmbH.com/
01-Jun-2002 Rev. A
Any changing of specification will not be informed individual
Page 3 of 8
SQ2143
Elektronische Bauelemente
CMOS 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 8
SQ2143
Elektronische Bauelemente
http://www.SeCoSGmbH.com/
01-Jun-2002 Rev. A
CMOS Positive
Voltage Regulator
Any changing of specification will not be informed individual
Page 5 of 8
SQ2143
Elektronische Bauelemente
ht tp://www.SeCoSGmbH.com/
01-Jun-2002 Rev. A
CMOS Positive
Voltage Regulator
Any changing of specification will not be informed individual
Page 6 of 8
SQ2143
CMOS Positive
Elektronische Bauelemente
Voltage Regulator
External Resistor Divider Table
R1(K Ohm)
1
2
Vout
5
10
20
50
100
200
500
1000
R2(K Ohm)=(1.215*R1(K Ohm))/(VOUT-1.215)
1.30
14.29
28.59
71.47
142.94
285.88
714.71
1.35
9.00
18.00
45.00
90.00
180.00
450.00
1.40
6.57
13.14
32.84
65.68
131.35
328.38
1.45
5.17
10.34
25.85
51.70
103.40
258.51
517.02
1.50
4.26
8.53
21.32
42.63
85.26
213.16
426.32
852.63
1.55
3.63
7.25
18.13
36.27
72.54
181.34
362.69
725.37
1.60
3.16
6.31
15.78
31.56
63.12
157.79
315.58
631.17
1.65
2.79
5.59
13.97
27.93
55.86
139.66
279.31
558.62
1.70
2.51
5.01
12.53
25.05
50.10
125.26
250.52
501.03
1.75
2.27
4.54
11.36
22.71
45.42
113.55
227.10
454.21
1.80
2.08
4.15
10.38
20.77
41.54
103.85
207.69
415.38
1.85
1.91
3.83
9.57
19.13
38.27
95.67
191.34
382.68
1.90
1.77
3.55
8.87
17.74
35.47
88.69
177.37
354.74
1.95
1.65
3.31
8.27
16.53
33.06
82.65
165.33
330.61
826.53
2.00
1.55
3.10
7.74
15.48
30.96
77.39
154.78
309.55
773.89
2.05
1.46
2.91
7.28
14.55
29.10
72.75
145.51
291.02
727.54
2.10
1.37
2.75
6.86
13.73
27.46
68.64
137.29
274.58
686.44
2.15
1.30
2.60
6.50
12.99
25.99
64.97
129.95
259.89
649.73
2.20
1.23
2.47
6.17
12.34
24.67
61.68
123.35
246.70
616.75
2.25
1.71
2.35
5.87
11.74
23.48
58.70
117.39
234.78
586.96
2.30
1.12
2.24
5.60
11.20
22.40
55.99
111.98
223.96
559.91
2.35
1.07
2.14
5.35
10.70
21.41
53.52
107.05
214.10
535.24
2.40
1.03
2.05
5.13
10.25
20.51
51.27
102.53
205.06
512.66
2.45
0.98
1.97
4.92
9.84
19.68
49.19
98.38
196.76
491.90
2.50
0.95
1.89
4.73
9.46
18.91
47.28
94.55
189.11
472.76
2.55
0.91
1.82
4.55
9.10
18.20
45.51
91.01
182.02
455.06
2.60
0.88
1.75
4.39
8.77
17.55
43.86
87.73
175.45
438.63
877.26
2.65
0.85
1.69
4.23
8.47
16.93
42.33
84.67
169.34
423.34
846.69
2.70
0.82
1.64
4.09
8.18
16.36
40.91
81.82
163.64
409.09
818.18
2.75
0.79
1.58
3.96
7.92
15.83
39.58
79.15
158.31
395.77
791.53
2.80
0.77
1.53
3.83
7.67
15.33
38.33
76.66
153.31
383.28
766.56
2.85
0.74
1.49
3.72
7.43
14.86
37.16
74.13
148.62
371.56
743.12
2.90
0.72
1.44
3.61
7.21
14.42
36.05
72.11
144.21
360.53
721.07
2.95
0.70
1.40
3.50
7.00
14.01
35.01
70.03
140.06
350.14
700.29
3.00
0.68
1.36
3.40
6.81
13.61
34.03
68.07
136.13
340.34
680.67
3.05
0.66
1.32
3.31
6.62
13.24
33.11
66.21
132.43
331.06
662.13
3.10
0.64
1.29
3.22
6.45
12.89
32.23
64.46
128.91
322.28
644.56
3.15
0.63
1.26
3.14
6.28
12.56
31.40
62.79
125.58
313.95
627.91
3.20
0.61
1.22
3.06
6.12
12.24
30.60
61.21
122.42
306.05
612.09
3.25
0.60
1.19
2.99
5.97
11.94
29.85
59.71
119.41
298.53
597.05
3.30
0.58
1.17
2.91
5.83
11.65
11.65
58.27
116.55
291.37
582.73
ht tp://www.SeCoSGmbH.com/
01-Jun-2002 Rev. A
Any changing of specification will not be informed individual
Page 7of 8
SQ2143
CMOS Positive
Elektronische Bauelemente
Voltage Regulator
External Resistor Divider Table
R1(K Ohm)
1
2
Vout
5
10
20
50
100
200
500
1000
R2(K Ohm)=(1.215*R1(K Ohm))/(VOUT-1.215)
3.35
0.57
1.14
2.85
5.69
11.38
28.45
56.91
113.82
284.54
569.09
3.40
0.56
1.11
2.78
5.56
11.12
27.80
55.61
111.21
278.03
556.06
3.45
0.54
1.09
2.72
5.44
10.87
27.18
54.36
108.72
271.81
543.62
3.50
0.53
1.06
2.66
5.32
10.63
26.59
53.17
106.35
265.86
531.73
3.55
0.52
1.04
2.60
5.20
10.41
26.02
52.03
104.07
260.17
520.34
3.60
0.51
1.02
2.55
5.09
10.19
25.47
50.94
101.89
254.72
509.43
3.65
0.50
1.00
2.49
4.99
9.98
24.95
49.90
99.79
249.49
498.97
3.70
0.49
0.98
2.44
4.89
9.78
24.45
48.89
97.79
244.47
488.93
3.75
0.48
0.96
2.40
4.79
9.59
23.96
47.93
95.86
239.64
479.29
3.80
0.47
0.94
2.35
4.70
9.40
23.50
47.00
94.00
235.01
470.02
3.85
0.46
0.92
2.31
4.61
9.22
23.06
46.11
92.22
230.55
461.10
3.90
0.45
0.91
2.26
4.53
90.5
22.63
45.25
90.50
226.26
452.51
3.95
0.44
0.89
2.22
4.44
8.88
22.21
44.42
88.85
222.12
444.24
4.00
0.44
0.87
2.18
4.36
8.73
21.81
43.63
87.25
218.13
436.27
4.05
0.43
0.86
2.14
4.29
8.57
21.43
42.86
85.71
214.29
428.57
4.10
0.42
0.84
2.11
4.21
8.42
21.06
42.11
84.23
210.57
421.14
4.15
0.41
0.83
2.07
4.14
8.28
20.70
41.40
82.79
206.98
413.97
4.20
0.41
0.81
2.04
4.07
8.14
20.35
40.70
81.41
203.52
407.04
4.25
0.40
0.80
2.00
4.00
8.01
20.02
40.03
80.07
200.16
400.33
4.30
0.39
0.79
1.97
3.94
7.88
19.69
39.38
78.77
196.92
393.84
4.35
0.39
0.78
1.97
3.88
7.75
19.38
38.76
77.51
193.78
387.56
4.40
0.38
0.76
1.91
3.81
7.63
19.07
38.15
76.30
190.74
381.48
4.45
0.38
0.75
1.88
3.76
7.51
18.78
37.56
75.12
187.79
375.58
4.50
0.37
0.74
1.85
3.70
7.40
18.49
36.99
73.97
184.93
369.86
4.55
0.36
0.73
1.82
3.64
7.29
18.22
36.43
72.86
182.16
364.32
4.60
0.36
0.72
1.79
3.59
7.18
17.95
35.89
71.79
179.47
358.94
4.65
0.35
0.71
1.77
3.54
7.07
17.69
35.37
70.74
176.86
353.71
4.70
0.35
0.70
1.74
3.49
6.97
17.43
34.86
69.73
174.32
348.64
4.75
0.34
0.69
1.72
3.44
6.87
17.19
34.37
68.74
171.85
343.71
4.80
0.34
0.68
1.69
3.39
6.78
16.95
33.89
67.78
169.46
338.91
4.85
0.33
0.67
1.67
3.34
6.69
16.71
33.43
66.85
167.13
334.25
4.90
0.33
0.66
1.65
3.30
6.59
16.49
32.97
65.94
164.86
329.72
4.95
0.33
0.65
1.63
3.25
6.51
16.27
32.53
65.06
162.65
325.30
5.00
0.32
0.64
1.61
3.21
6.42
16.05
32.10
64.02
160.50
321.00
Note: Small load (greater than 2mA) is necessary as R1 or R2 is large than 50Kohm. Otherwise, output voltage probably cannot be
pulled down to 0V on disable mode
http://www.SeCoSGmbH.com/
01-Jun-2002 Rev. A
Any changing of specification will not be informed individual
Page 8 of 8