SPX29150/51/52/53
1.5A Low Dropout Voltage Regulator
FEATURES
■ Adjustable Output Down to 1.25V
■ 1% Output Accuracy
■ Output Current of 1.5A
■ Low Dropout Voltage of 390mV @ 1.5A
■ Extremely Tight Load and Line
Regulation
■ Extremely Fast Transient Response
■ Reverse-Battery Protection
■ Zero Current Shutdown (5 pin version)
■ Error Flag Signal Output for Out of
Regulation State (5 pin version)
■ Standard TO-220 and TO-263
Packages
APPLICATIONS
■ Powering VGA and Sound Cards
■ LCD Monitors
■ USB Power Supplies
■ PowerPC™ Supplies
■ SMPS Post Regulators
■ High-efficiency “Green” Computer
Systems
■ High-efficiency Linear Power Supplies
■ Portable Instrumentation
■ Constant Current Regulators
■ Adjustable Power Supplies
■ Battery Chargers
DESCRIPTION
The SPX29150/51/52/53 are 1.5A, highly accurate voltage regulators with a low dropout
voltage of 390mV (typical) @ 1.5A. These regulators are specifically designed for low volt-
age applications that require a low dropout voltage and a fast transient response. They are
fully fault protected against over-current, reverse battery, and positive and negative voltage
transients. On-chip trimming adjusts the reference voltage to 1% initial accuracy. Other
features in the 5 pin versions include Enable and Error Flag.
The SPX29150/51/52/53 is offered in 3-pin and 5-pin TO-220 & TO-263 packages. For a 3A
version, refer to the SPX29300 data sheet.
TYPICAL APPLICATION CIRCUITS
V
IN
+
6.8µ F
1
SPX29150
3
2
+
10µ F
V
OUT
V
IN
+
6.8µ F
1
SPX29152
4
2
GND
R2
3
5
ADJ
V
OUT
+
R1 10µ F
Figure 1. Fixed Output Linear Regulator
REV B 06/05/08
Figure 2. Adjustable Output Linear Regulator
© Copyright 2008 Exar Corporation
SP29150/51/52/53 1.5A Low Dropout Voltage Regulator
1
ABSOLUTE MAXIMUM RATINGS
Storage Temperature Range........................-65°C to +150°C
Operating Junction Temperature Range......-40°C to +125°C
Input Voltage (Note 7)......................................................16V
at V
IN
=V
OUT
+ 1V and I
OUT
= 10mA, C
IN
= 6.8µF, C
OUT
= 10µF, T
A
= 25°C, unless otherwise specified. The
Boldface
applies over the junction temperature range. Adjustable versions are set to 5.0V.
SPX29150/51
PARAMETER
CONDITIONS
Typ
Units
Min
Max
1.8V Version
I
OUT
= 10mA
1.8
1.782
1.818
Output Voltage
V
10mA ≤ I
OUT
≤ 1.5A, 2.5V ≤ V
IN
≤ 16V
1.8
1.764
1.836
2.5V Version
I
OUT
= 10mA
2.5
2.475
2.525
Output Voltage
V
10mA ≤I
OUT
≤1.5A, 3.5V≤V
IN
≤16V
I
1.5A,
≤V
16V
V
2.5
2.450
2.550
3.3V Version
I
OUT
= 10mA
3.3
3.267
3.333
Output Voltage
V
10mA ≤I
OUT
≤1.5A, 4.3V≤V
IN
≤16V
I
1.5A,
≤V
16V
V
3.3
3.234
3.366
5.0V Version
I
OUT
= 10mA
5.0
4.950
5.050
Output Voltage
V
10mA ≤I
OUT
≤1.5A, 6.0V≤V
IN
≤16V
I
1.5A,
≤V
16V
V
5.0
4.900
5.100
All Voltage Options
SPX29150/51/52/53
Line Regulation
I
O
= 10mA, (V
OUT
+ 1V) ≤ V
IN
≤
16V
V
16V
0.1
0.5
%
V
IN
= V
OUT
+ 1V, 10mA ≤ I
OUT
≤ I
FULL
-
Load Regulation
0.2
1
%
LOAD
ELECTRICAL CHARACTERISTICS
∆V
∆T
Dropout Voltage (Note 1)
(except 1.8V version)
Ground Current (Note 3)
I
GNDDO
Ground Pin Cur-
rent at Dropout
Current Limit
Output Noise Voltage
(10Hz to 100kHz)
I
L
= 100mA
Reference Voltage
Output Voltage
Temperature Coefficient
I
O
= 100mA
I
O
= 750mA
I
O
= 1.5A
I
O
= 750mA, V
IN
= V
OUT
, +1V
I
O
= 1.5A
V
IN
= 0.1V less than specified V
OUT
I
OUT
= 10mA
V
OUT
= 0.0V (Note 2)
C
L
= 10µF
C
L
= 33µF
Adjustable version only
13
70
230
390
12
45
0.9
2.2
400
260
1.240
1.228
1.215
1.203
1.7
100
200
ppm/°C
mV
600
25
mA
mA
A
µV
RMS
1.252
1.265
1.277
80
120
V
Reference Voltage
Adjustable version only (Note 8)
Adjust Pin
Bias Current
Reference Voltage Tem-
perature
(Note 4)
Coefficient
Adjust Pin Bias
Current Temperature
Coefficient
Flag Output (Error Comparator) SPX29151/53
Output Leakage Current
Output Low Voltage
Rev B 06/05/08
40
13
nA
ppm/°C
0.1
nA/°C
V
OH
=16V
Device set for 5V, V
IN
=4.5V,
I
OL
=250µA
0.1
200
1.00
2.00
300
400
UA
mV
SP29150/51/52/53 1.5A Low Dropout Voltage Regulator
© Copyright 2008 Exar Corporation
2
ELECTRICAL CHARACTERISTICS CONT'D
PARAMETER
Upper Threshold
Voltage
Lower Threshold
Voltage
Hysteresis
ENABLE input
SPX29151/52
Input Logic Voltage
Low (OFF)
High (ON)
Enable Input Pin Input
Current
V
IN
< 10V
V
EN
=16V
V
EN
=0.8V
Regulator Output Cur-
rent in Shutdown
(Note 6)
TO-220 Junction to Case, at Tab
TO-220 Junction to Ambient
Thermal Resistance
TO-263 Junction to Case, at Tab
TO-263 Junction to Ambient
100
CONDITIONS
Device set for 5V (Note 5)
Device set for 5V (Note 5)
Device set for 5V (Note 5)
Typ
60
75
15
SPX29150/51
Min
Max
40
25
95
140
Units
mV
mV
mV
2.4V
0.8
600
750
1
2
V
µA
µA
µA
10
3
30
3
32
500
°C/W
NOTES:
Note 1: Dropout voltage is defined as the input to output differential when the output voltage drops to 99% of its nominal value.
Note 2: V
IN
= V
OUT
(NOMINAL) +1V. For example, use V
IN
= 4.3V for a 3.3V regulator. Employ pulse-testing procedures to minimize temperature rise.
Note 3: Ground pin current is the regulator quiescent current. The total current drawn from the source is the sum of the load current to the ground
current.
Note 4: Thermal regulation is defined as the change in the output voltage at a time T after a change in power dissipation is applied, excluding load or line
regulation effects.
Note 5: Comparator threshold is expressed in terms of a voltage differential at the Adjust terminal below the nominal reference voltage measured 6V
input. To express these thresholds in terms of output voltage change, multiply the error amplifier gain = V
OUT
/V
REF
= (R1 + R2)/R2. For example, at
a programmable output voltage of 5V, the Error output is guaranteed to go low when the output drops by 95mVx 5V/ 1.240V = 38mV. Thresholds
remain constant as a percent of V
OUT
as V
OUT
is varied, with the dropout warning occurring at typically 5% below nominal, 7.7% guaranteed.
Note 6: V
EN
≤ 0.8V and V
IN
≤ 16V, V
OUT
= 0.
Note 7: Maximum positive supply voltage of 20V must be of limited duration (<100m_) < 1%. The maximum continuous supply voltage is 16V.
Note 8: V
REF
≤ V
OUT
≤ (V
IN
-1), 2.5V≤V
IN
≤ 16V, 10mA ≤ I
L
≤ I
FL
, T
J
< T
JMAX
.
BLOCK DIAGRAM
OUT
IN
O.v
I
LIMIT
FLAG
+
-
1.180v
Reference
1.240v
+
-
28v
R1*
ADJ
EN
Thermal
shutdown
R2*
GND
REV B 06/05/08
SP29150/51/52/53 1.5A Low Dropout Voltage Regulator
© Copyright 2008 Exar Corporation
3
TYPICAL PERFORMANCE CHARACTERISTICS
3.310
3.305
3.300
3.295
3.290
3.3V Device
IL = 10mA
CL = 10uF
3.320
3.315
3.310
Vout (V)
3.305
3.300
3.295
3.290
3.285
3.280
4
6
8
10
Vin (V)
12
14
16
Vout (V )
3.285
3.280
3.3V Device
Vin = 4.3V
CL = 10µF
0
0.75
0.25
0.5
1
1.25
1.5
IL (A)
Figure 3. Line Regulation
Figure 4. Load Regulation
80.0
70.0
60.0
300
280
260
Ignd (mA)
Ignd (uA)
50.0
40.0
30.0
20.0
10.0
0.0
0
0.25
0.5
0.75
IL (A)
1
1.25
1.5
240
220
200
180
4
6
8
10
Vin (V)
12
14
16
3.3V Device
IL = 10mA
CL = 10uF
3.3V Device
Vin = 4.3V
CL = 10uF
Figure 5. Ground Current vs Load Current
Figure 6. Ground Current vs Input Voltage
600
100
90
80
500
Vdropout (mV)
Ignd (mA)
70
60
50
40
30
20
10
0
0
0.25
0.5
0.75
IL (A)
1
1.25
1.5
3.3V Device
Vin = 3.2V
400
300
200
3.3V Device
CL = 10uF
100
0
0
0.25
0.5
0.75
IL (A)
1
CL = 10uF
1.25
1.5
Figure 7. Ground Current vs Load Current in Dropout
Figure 8. Dropout Voltage vs Load Current
REV B 06/05/08
SP29150/51/52/53 1.5A Low Dropout Voltage Regulator
© Copyright 2008 Exar Corporation
4
TYPICAL PERFORMANCE CHARACTERISTICS
280
270
260
250
3.320
3.310
3.300
3.290
Vout
Ignd (uA)
240
230
220
210
200
190
180
-40
-20
0
20
40
60
Temperature (
o
C)
80
100
120
3.280
3.270
3.260
3.250
3.240
3.230
3.220
-40
-20
0
20
40
60
Temperature (
o
C)
80
100
120
3.3V Device
Vin = 4.3V
IL = 10mA
CL = 10uF
3.3V Device
Vin = 4.3V
IL = 10mA
CL = 10uF
Figure 9. Ground Current vs Temperature
at I
LOAD
=10mA
7.00
6.80
6.60
6.40
Figure 10. Output Voltage vs Temperature at
I
LOAD
=10mA
30
29
Ignd (mA)
6.20
6.00
5.80
5.60
5.40
5.20
5.00
-40
-20
0
20
40
60
Temperature (
o
C)
80
Ignd (mA)
3.3V Device
Vin = 4.3V
IL = 500mA
CL = 10uF
28
27
26
25
24
23
22
21
3.3V Device
Vin = 3.2V
IL = 750mA
CL = 10µF
100
120
20
-40
-20
0
20
40
60
Temperature (
o
C)
80
100
120
Figure 11. Ground Current vs Temperature at
I
LOAD
=500mA
52.0
50.0
48.0
Ignd (mA)
Figure 12. Ground Current vs Temperature in
Dropout at I
LOAD
=750mA
100
95
90
Ignd (mA)
85
80
75
70
-40
-20
0
20
40
60
Temperature (
o
C)
80
100
120
3.3V Device
Vin = 3.2V
IL = 1.5A
CL = 10µF
46.0
44.0
42.0
40.0
38.0
36.0
-40
-20
0
20
40
60
(
o
C)
80
100
120
3.3V Device
Vin = 4.3V
IL = 1.5A
CL = 10uF
Temperature
Figure 13. Ground Current vs Temperature at
I
LOAD
=1.5A
Figure 14. Ground Current vs Temperature in
Dropout at I
LOAD
=1.5A
REV B 06/05/08
SP29150/51/52/53 1.5A Low Dropout Voltage Regulator
© Copyright 2008 Exar Corporation
5
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