SECOS S5U2188

S5U2188
1.5A CMOS
Low Dropout Voltage Regulator
Elektronische Bauelemente
RoHS Compliant Product
Description
The S5U2188 of positive,linear regulators feature low quiescent
current (45µA typ.) with low dropout voltage, making them ideal
for battery applications. Output voltage are set at the factory and
trimmed to 1.5% accuracy.These rugged devices have both
Thermal Shutdown and Current Fold-back to prevent device failure
under the "Worst" of operating conditions.The S5U2188 is stable
with an output capacitance of 4.7µF or greater.
Features
REF.
* Low Temperature Coefficient
* Over-Temperature Shutdown
* Adjustable Version
* Very Low Dropout Voltage
* High Accurate ± 1.5%
A
b
L4
c
L1
E
Millimeter
Min.
Max.
4.40
4.80
0.66
0.91
0.00
0.30
0.36
0.5
2.29
2.79
9.80
10.4
REF.
c2
L2
e
L
Millimeter
Min.
Max.
1.25
1.45
1.27 REF.
8.6
9.0
1.70 REF.
14.6
15.8
0˚
8˚
* Short Circuit Current Fold-back
* Guaranteed 1.5A output
* Current Limiting
* Power-Saving Shutdown Mode
Applications
* PC Peripherals
* Wireless Devices
* Portable Electronics
* Battery Powered Widgets
* Instrumentation
Functional Block Diagram
Typical Application Circuit
S5U2188
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01-Jun-2002 Rev. A
Any changing of specification will not be informed individual
Page 1 of 7
S5U2188
1.5A CMOS
Elektronische Bauelemente
Low Dropout Voltage Regulator
Absolute Maximum Ratings
Parameter
Ratings
Symbol
Unit
Input Voltage
VIN
8
V
Output Current
IOUT
PD/(VIN-VO)
mA
Output Voltage
VOUT
Operating Ambient Temperature
Topr
Max. Junction Temperature
o
Output Voltage
Symbol
VOUT (E)
Output Current
Current Limit
Load Regulation
IO
ILIM
REGLOAD
(Note1)
unless otherwise
Condition
Min
Typ
Max
Unit
VEN=VEHmin, IO=1mA
-1.5%
VOUT(T)
1.5%
V
VOUT>1.2V
1.5
-
-
A
VOUT>1.2V
1.5
2.0
-
A
-1
0.2
1
%
-
-
1300
-
-
800
-
-
600
45
-
IO=1mA to 1.5A
1.5V<VOUT(T)
Ground Pin Current
Line Regulation
Input Voltage
Over Temperature Shutdown
Over Temperature Hysterisis
Output Voltage
Temperature Coefficient
Short Circuit Current
ADJ Input Bias Current
Minimum Load Current
ADJ Reference Voltage
Power Supply Rejection
Output Voltage Noise
EN Input Threshold
EN Input Bias Current
Shutdown Supply Current
C
W
B
Electrical Characteristics VIN=VOUT(T)+2V, VEN=VIN, TA=25
Dropout Voltage
C
o
3.0
PD
EDS Classification
Parameter
C
o
-40~+125
150
Tj Max.
T=100 C)
V
o
-40~+85
Tj
Junction Temperature
Power Dissipation (
Gnd-0.3~VIN+0.3
VDROPOUT
2.0V
IO=1.5A
2.0V<VOUT(T) 2.8V
VO=VOUT(E)-2%
2.8V<VOUT(T)
(Note2)
IGND
IO=1mA~1.5A
-
VOUT(T)<2.0V
IO=1mA
2.0V
VOUT(T)<4.0V
VIN=VOUT(T)+1
to
(T)+1 to
VOUT(T)+2
4.0V VOUT(T)
-0.15
-
0.15
REGLINE
-0.1
0.02
0.1
-0.4
-
0.4
mV
A
%
VIN
OTS
OTH
Note3
-
7
-
150
-
-
30
-
TC
-
30
-
ppm/
-
750
-
mA
ISC
IADJ
IMin
VREF
PSRR
eN
VEH
VEL
IEH
IEL
ISD
VOUT<0.4V
VIN=5V, VADJ=1.242V
Io=100mA
Co=4.7 F ceramic
V
-
1
-
A
1
-
-
mA
V
1.223
1.242
1.261
f=1kHz
-
50
-
f=10kHz
-
20
-
-
30
-
Vrms
2.0
-
VIN
V
0
-
0.4
V
f=10Hz~100kHz
Co=4.7 F
Io=10mA,
VIN=2.7V to 7V
VIN=2.7V to 7V
dB
VIN=7V
-
-
0.1
A
VEN= 0V, VIN=7V
-
-
0.5
A
VIN=5V, VOUT=0V, VEN=0V
-
0.5
2
A
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) =V OUT+VDROPOUT
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01-Jun-2002 Rev. A
Any changing of specification will not be informed individual
Page 2 of 7
S5U2188
1.5A CMOS
Elektronische Bauelemente
Low Dropout Voltage Regulator
Ordering Information(contd.)
Part Number
Marking
Output Voltage
8HAD2
XXXX
Adjustable
S5U 2188-AD
Part Number
Marking
Output Voltage
Detailed Description
The S5U2188 of COMS regulator contains a PMOS pass transistor, voltage reference, error amplifier, overcurrent 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 become active when the junction temperature exceeds
140 , or the current exceeds 2.2A. During thermal shutdown, the output voltage remains low. Normal
operation is restored when the junction temperature drops below 120 .
The S5U2188 behaves like a current source when the load reaches 2.2A. However, if the load impedance
drops below 0.3 , the current drops back to 600mA to prevent excessive power dissipation. Normal operation
is restored when the load resistance exceeds 0.75 .
External Capacitors
The S5U2188 is stable with an output capacitance to ground of 4.7 F 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 0.1 F ceramic capacitor with a 10 F 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 0.1 F to have a beneficial effect.
All capacitors should be placed in close proximity to the pins. A “Quiet” ground termination is desirable. This
can be achieved with a “Star” connection.
Enable
When pulled low, the PMOS pass transistor shuts off, and all internal circuits are powered down. In this state,
the quiescent current is less than 1 A. This pin behaves much like an electronic switch.
100k resistor is necessary between VEN source and EN pin when VEN is higher than VIN.
(Note: there is no internal pull-up for EN PIN)
Adjustable Version
The adjustable version uses external feedback resistors to generate an output voltage anywhere from 1.5V to
5.0V. Vadj is trimmed to 1.242V and Vout is given by the equation:
VOUT=Vadj * (1+R1/R2)
Feedback resistors R1 and R2 should be high enough to keep quiescent current low, but increasing R1+R2 will
reduce stability. In general, R1 and R2 in the 10’s of k will produce adequate stability, given reasonable
layout precautions. To improve stability characteristics, keep parasitic on the ADJ pin to minimum, and lower
R1 and R2 values.
ht tp://www.SeCoSGmbH.com/
01-Jun-2002 Rev. A
Any changing of specification will not be informed individual
Page 3 of 7
S5U2188
Elektronische Bauelemente
1.5A CMOS
Low Dropout Voltage Regulator
Characteristics Curve
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01-Jun-2002 Rev. A
Any changing of specification will not be informed individual
Page 4 of 7
S5U2188
Elektronische Bauelemente
1.5A CMOS
Low Dropout Voltage Regulator
115
85
55
25
-5
-45
http://www.SeCoSGmbH.com/
01-Jun-2002 Rev. A
Any changing of specification will not be informed individual
Page 5 of 7
S5U2188
Elektronische Bauelemente
ht tp://www.SeCoSGmbH.com/
01-Jun-2002 Rev. A
1.5A CMOS
Low Dropout Voltage Regulator
Any changing of specification will not be informed individual
Page 6 of 7
S5U2188
1.5A CMOS
Elektronische Bauelemente
Low Dropout Voltage Regulator
External Resistor Divider Table
R1(kΩ )
VOUT
1
2
1.30
21.41
1.35
11.50
1.40
1.45
5
10
20
50
R1(kΩ)
VOUT
1
42.83 107.07 214.14 428.28 1070.7
3.20
0.63
1.27
3.17
6.34
12.69
31.72
23.00
57.50 115.00 230.00 575.00
3.25
0.62
1.24
3.09
6.19
12.37
30.93
7.86
15.72
39.30
78.61 157.22 393.04
3.30
0.60
1.21
3.02
6.03
12.07
30.17
5.97
11.94
29.86
59.71 119.42 298.56
3.35
0.59
1.18
2.95
5.89
11.78
29.46
1.50
4.81
9.63
24.07
48.14
96.28 240.70
3.40
0.58
1.15
2.88
5.76
11.51
28.78
1.55
4.03
8.06
20.16
40.32
80.65 201.62
3.45
0.56
1.13
2.81
5.63
11.25
28.13
1.60
3.47
6.94
17.35
34.69
68.39 173.46
3.50
0.55
1.10
2.75
5.50
11.00
27.50
1.65
3.04
6.09
15.22
30.44
60.88 152.21
3.55
0.54
1.08
2.69
5.38
10.76
26.91
1.70
2.71
5.42
13.56
27.12
54.24 135.59
3.60
0.53
1.05
2.63
5.27
10.53
26.34
1.75
2.44
4.89
12.22
24.45
48.90 122.24
3.65
0.52
1.03
2.58
5.16
10.32
25.79
1.80
2.23
4.45
11.13
22.26
44.52 111.29
3.70
0.51
1.01
2.53
5.05
10.11
25.26
1.85
2.04
4.09
10.21
20.43
40.86 102.14
3.75
0.50
0.99
2.48
4.95
9.90
24.76
1.90
1.89
3.78
9.44
18.88
37.75
94.38
3.80
0.49
0.97
2.43
4.86
9.71
24.28
1.95
1.75
3.51
8.77
17.54
35.08
87.71
3.85
0.48
0.95
2.38
4.76
9.52
23.81
2.00
1.64
3.28
8.19
16.39
32.77
81.93
3.90
0.47
0.93
2.34
4.67
9.35
23.36
2.05
1.54
3.07
7.69
15.37
30.74
76.86
3.95
0.46
0.92
2.29
4.59
9.17
22.93
2.10
1.45
2.90
7.24
14.48
28.95
72.38
4.00
0.45
0.90
2.25
4.50
9.01
22.52
2.15
1.37
2.74
6.84
13.68
27.36
68.39
4.05
0.44
0.88
2.21
4.42
8.85
22.12
2.20
1.30
2.59
6.48
12.96
25.93
64.82
4.10
0.43
0.87
2.17
4.35
8.69
21.73
2.25
1.23
2.46
6.16
12.32
24.65
61.61
4.15
0.43
0.85
2.14
4.27
8.54
21.35
2.30
1.17
2.35
5.87
11.74
23.48
58.70
4.20
0.42
0.84
2.10
4.20
8.40
20.99
2.35
1.12
2.24
5.60
11.21
22.42
56.05
4.25
0.41
0.83
2.06
4.13
8.26
20.64
2.40
1.07
2.15
5.36
10.73
21.45
53.63
4.30
0.41
0.81
2.03
4.06
8.12
20.31
2.45
1.03
2.06
5.14
10.28
20.56
51.41
4.35
0.40
0.80
2.00
4.00
7.99
19.98
2.50
0.99
1.97
4.94
9.87
19.75
49.36
4.40
0.39
0.79
1.97
3.93
7.87
19.66
2.55
0.95
1.90
4.75
9.50
18.99
47.48
4.45
0.39
0.77
1.94
3.87
7.74
19.36
2.60
0.91
1.83
4.57
9.15
18.29
45.73
4.50
0.38
0.76
1.91
3.81
7.62
19.06
2.65
0.88
1.76
4.41
8.82
17.64
44.11
4.55
0.38
0.75
1.88
3.75
7.51
18.77
2.70
0.85
1.70
4.26
8.52
17.04
42.59
4.60
0.37
0.74
1.85
3.70
7.40
18.49
2.75
0.82
1.65
4.12
8.24
16.47
41.18
4.65
0.36
0.73
1.82
3.64
7.29
18.22
2.80
0.80
1.59
3.99
7.97
15.94
39.86
4.70
0.36
0.72
1.80
3.59
7.18
17.96
2.85
0.77
1.54
3.86
7.72
15.45
38.62
4.75
0.35
0.71
1.77
3.54
7.08
17.70
2.90
0.75
1.50
3.75
7.49
14.98
37.45
4.80
0.35
0.70
1.75
3.49
6.98
17.45
2.95
0.73
1.45
3.64
7.27
14.54
36.36
4.85
0.34
0.69
1.72
3.44
6.88
17.21
3.00
0.71
1.41
3.53
7.06
14.13
35.32
4.90
0.34
0.68
1.70
3.40
6.79
16.98
3.05
0.69
1.37
3.43
6.87
13.74
34.35
4.95
0.33
0.67
1.67
3.35
6.70
16.75
3.10
0.67
1.34
3.34
6.68
13.37
33.42
5.00
0.33
0.66
1.65
3.30
6.61
16.52
3.15
0.65
1.30
3.25
6.51
13.02
32.55
R2(kΩ)=(1.242*R1(k Ω))/(VOUT-1.242)
2
5
10
20
50
R2(kΩ)=(1.242*R1(k Ω))/(VOUT-1.242)
Note: Small load (greater than 2mA) is necessary as R1 or R2 is larger than 50kΩ. Otherwise, output voltage probably can not be pulled
down to 0V on disable mode.
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01-Jun-2002 Rev. A
Any changing of specification will not be informed individual
Page 7 of 7