1
REV B 06/05/08 SP29150/51/52/53 1.5A Low Dropout Voltage Regulator © Copyright 2008 Exar Corporation
FOR SIPEX
APPROVAL
1.5A Low Dropout Voltage Regulator
SPX29150/51/52/53
DESCRIPTION
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
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 specically 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.
APPLICATIONS
■ Powering VGA and Sound Cards
■ LCD Monitors
■ USB Power Supplies
■ PowerPC™ Supplies
■ SMPS Post Regulators
■ High-efciency “Green” Computer
Systems
■ High-efciency Linear Power Supplies
■ Portable Instrumentation
■ Constant Current Regulators
■ Adjustable Power Supplies
■ Battery Chargers
Figure 1. Fixed Output Linear Regulator Figure 2. Adjustable Output Linear Regulator
TYPICAL APPLICATION CIRCUITS
SPX29152
V
OUT
V
IN
GND ADJ
1
23
4
5R1
R2
6.8µF
+ + 10µF
SPX29150
V
OUT
V
IN
6.8µF
++10µF
1
2
3
2
Rev B 06/05/08 SP29150/51/52/53 1.5A Low Dropout Voltage Regulator © Copyright 2008 Exar Corporation
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 ELECTRICAL CHARACTERISTICS
at VIN=VOUT + 1V and IOUT = 10mA, CIN = 6.8µF, COUT = 10µF, TA = 25°C, unless otherwise specied. The Boldface
applies over the junction temperature range. Adjustable versions are set to 5.0V.
PARAMETER CONDITIONS Typ SPX29150/51
Min Max Units
1.8V Version
Output Voltage IOUT = 10mA
10mA ≤ IOUT ≤ 1.5A, 2.5V ≤ VIN ≤ 16V 1.8
1.8 1.782
1.764 1.818
1.836 V
2.5V Version
Output Voltage IOUT = 10mA
10mA ≤I≤IIOUT≤1.5A, 3.5V≤V1.5A, 3.5V≤V≤VVIN ≤16V16V 2.5
2.5 2.475
2.450 2.525
2.550 V
3.3V Version
Output Voltage IOUT = 10mA
10mA ≤I≤IIOUT≤1.5A, 4.3V≤V1.5A, 4.3V≤V≤VVIN ≤16V16V 3.3
3.3 3.267
3.234 3.333
3.366 V
5.0V Version
Output Voltage IOUT = 10mA
10mA ≤I≤IIOUT≤1.5A, 6.0V≤V1.5A, 6.0V≤V≤VVIN ≤16V16V 5.0
5.0 4.950
4.900 5.050
5.100 V
All Voltage Options
SPX29150/51/52/53
Line Regulation IO = 10mA, (VOUT + 1V) ≤ V≤ V VIN ≤ 16V 16V 0.1 0.5 %
Load Regulation VIN = VOUT + 1V, 10mA ≤ IOUT≤ IFULL-
LOAD 0.2 1 %
∆V Output Voltage
Temperature Coefcient
13 100 ppm/°C
∆T
Dropout Voltage (Note 1)
(except 1.8V version)
IO = 100mA 70 200
mVIO = 750mA 230
IO = 1.5A 390 600
Ground Current (Note 3) IO = 750mA, VIN = VOUT, +1V
IO = 1.5A 12
45 25 mA
IGNDDO Ground Pin Cur-
rent at Dropout VIN = 0.1V less than specied VOUT
IOUT = 10mA 0.9 mA
Current Limit VOUT = 0.0V (Note 2) 2.2 1.7 A
Output Noise Voltage
(10Hz to 100kHz)
IL = 100mA
CL = 10µF
CL = 33µF
400
260 µVRMS
Reference Voltage Adjustable version only 1.240 1.228
1.215 1.252
1.265 V
Reference Voltage Adjustable version only (Note 8) 1.203 1.277
Adjust Pin
Bias Current 40 80
120 nA
Reference Voltage Tem-
perature
Coefcient
(Note 4) 13 ppm/°C
Adjust Pin Bias
Current Temperature
Coefcient 0.1 nA/°C
Flag Output (Error Comparator) SPX29151/53
Output Leakage Current VOH=16V 0.1 1.00
2.00 UA
Output Low Voltage Device set for 5V, VIN=4.5V,
IOL=250µA 200 300
400 mV
3
REV B 06/05/08 SP29150/51/52/53 1.5A Low Dropout Voltage Regulator © Copyright 2008 Exar Corporation
FOR SIPEX
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NOTES:
Note 1: Dropout voltage is dened as the input to output differential when the output voltage drops to 99% of its nominal value.
Note 2: VIN = VOUT (NOMINAL) +1V. For example, use VIN = 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 dened 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 amplier gain = VOUT/VREF = (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 VOUT as VOUT is varied, with the dropout warning occurring at typically 5% below nominal, 7.7% guaranteed.
Note 6: VEN ≤ 0.8V and VIN ≤ 16V, VOUT = 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: VREF ≤ VOUT ≤ (VIN-1), 2.5V≤VIN ≤ 16V, 10mA ≤ IL ≤ IFL, TJ < TJMAX.
Reference
Thermal
shutdown
EN
IN OUT
ADJ
GND
O.v
I
LIMIT
28v R1*
R2*
1.180v 1.240v
++
- -
FLAG
BLOCK DIAGRAM
ELECTRICAL CHARACTERISTICS CONT'D
PARAMETER CONDITIONS Typ SPX29150/51
Min Max Units
Upper Threshold
Voltage Device set for 5V (Note 5) 60 40
25 mV
Lower Threshold
Voltage Device set for 5V (Note 5) 75 95
140 mV
Hysteresis Device set for 5V (Note 5) 15 mV
ENABLE input
SPX29151/52
Input Logic Voltage
Low (OFF)
High (ON) VIN < 10V 2.4V 0.8 V
Enable Input Pin Input
Current VEN=16V 100 600
750 µA
VEN=0.8V 1
2µA
Regulator Output Cur-
rent in Shutdown (Note 6) 10 500 µA
Thermal Resistance
TO-220 Junction to Case, at Tab
TO-220 Junction to Ambient
TO-263 Junction to Case, at Tab
TO-263 Junction to Ambient
3
30
3
32 °C/W
4
REV B 06/05/08 SP29150/51/52/53 1.5A Low Dropout Voltage Regulator © Copyright 2008 Exar Corporation
TYPICAL PERFORMANCE CHARACTERISTICS
Figure 3. Line Regulation Figure 4. Load Regulation
Figure 5. Ground Current vs Load Current Figure 6. Ground Current vs Input Voltage
Figure 7. Ground Current vs Load Current in Dropout Figure 8. Dropout Voltage vs Load Current
3.280
3.285
3.290
3.295
3.300
3.305
3.310
3.315
3.320
4 6 8 10 12 14 16
Vin (V)
3.3V Device
IL = 10mA
CL = 10uF
Vout (V)
3.280
3.285
3.290
3.295
3.300
3.305
3.310
00.25
0.5
0.75
1
1.25 1.5
IL (A)
Vin = 4.3V
CL = 10µF
3.3V Device
Vout (V )
0.0
10.0
20.0
30.0
40.0
50.0
60.0
70.0
80.0
0 0.25 0.5 0.75 1 1.25 1.5
IL (A)
3.3V Device
Vin = 4.3V
CL = 10uF
Ignd (mA)
180
200
220
240
260
280
300
4 6 8 10 12 14 16
Vin (V)
3.3V Device
IL = 10mA
CL = 10uF
Ignd (uA)
0
10
20
30
40
50
60
70
80
90
100
0 0.25 0.5 0.75 1 1.25 1.5
IL (A)
3.3V Device
Vin = 3.2V
CL = 10uF
Ignd (mA)
0
100
200
300
400
500
600
0 0.25 0.5 0.75 1 1.25 1.5
IL (A)
3.3V Device
CL = 10uF
Vdropout (mV)
5
REV B 06/05/08 SP29150/51/52/53 1.5A Low Dropout Voltage Regulator © Copyright 2008 Exar Corporation
FOR SIPEX
APPROVAL
Figure 9. Ground Current vs Temperature Figure 10. Output Voltage vs Temperature at
at ILOAD=10mA ILOAD=10mA
Figure 11. Ground Current vs Temperature at
ILOAD=500mA
Figure 13. Ground Current vs Temperature at
ILOAD=1.5A
TYPICAL PERFORMANCE CHARACTERISTICS
180
190
200
210
220
230
240
250
260
270
280
-40 -20 0 20 40 60 80 100 120
Temperature (oC)
3.3V Device
Vin = 4.3V
IL = 10mA
CL = 10uF
Ignd (uA)
5.00
5.20
5.40
5.60
5.80
6.00
6.20
6.40
6.60
6.80
7.00
-40 -20 0 20 40 60 80 100 120
Temperature (
o
C)
3.3V Device
Vin = 4.3V
IL = 500mA
CL = 10uF
Ignd (mA)
36.0
38.0
40.0
42.0
44.0
46.0
48.0
50.0
52.0
-40 -20 0 20 40 60 80 100 120
Temperature (
o
C)
3.3V Device
Vin = 4.3V
IL = 1.5A
CL = 10uF
Ignd (mA)
70
75
80
85
90
95
100
-40 -20 0 20 40 60 80 100 120
Temperature (oC)
3.3V Device
Vin = 3.2V
IL = 1.5A
CL = 10µF
Ignd (mA)
Figure 12. Ground Current vs Temperature in
Dropout at ILOAD=750mA
Figure 14. Ground Current vs Temperature in
Dropout at ILOAD=1.5A
20
21
22
23
24
25
26
27
28
29
30
-40 -20 0 20 40 60 80 100 120
Temperature (oC)
3.3V Device
Vin = 3.2V
IL = 750mA
CL = 10µF
Ignd (mA)
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REV B 06/05/08 SP29150/51/52/53 1.5A Low Dropout Voltage Regulator © Copyright 2008 Exar Corporation
Figure 15. Dropout Voltage vs Temperature at
ILOAD=750mA
Figure 17. ENABLE Current vs Temperature at Figure 18. ENABLE Threshold vs Temperature
VEN=16V
TYPICAL PERFORMANCE CHARACTERISTICS
150
170
190
210
230
250
270
290
310
330
350
-40 -20 0 20 40 60 80 100 120
Temperature (
o
C)
3.3V Device
IL = 750mA
CL = 10uF
Vdropout (mV)
320
340
360
380
400
420
440
460
480
500
-40 -20 0 20 40 60 80 100 120
Temperature (
o
C)
3.3V Device
IL = 750mA
CL = 10uF
Vdropout (mV)
Figure 16. Dropout Voltage vs Temperature at
ILOAD=1.5A
0
5
10
15
20
25
30
35
-40
-20
0
20
40
60
80
100
120
Temperature (
o
C)
I (uA)
3.3V Device
EN
1.00
1.10
1.20
1.30
1.40
1.50
1.60
1.70
1.80
1.90
2.00
-40
-20
0
20
40
60
80
100
120
Temperature (
o
C)
Vth (V)
3.3V Device
7
REV B 06/05/08 SP29150/51/52/53 1.5A Low Dropout Voltage Regulator © Copyright 2008 Exar Corporation
FOR SIPEX
APPROVAL
The SPX29150/51/52/53 incorporates pro-
tection against over-current faults, reversed
load insertion, over temperature operation,
and positive and negative transient volt-
ages.
Thermal Considerations
Although the SPX29150/51/52/53 offers
limiting circuitry for overload conditions, it is
still necessary to insure that the maximum
junction temperature is not exceeded in the
application. Heat will ow through the lowest
resistance path, the junction-to-case path.
In order to insure the best thermal ow of
the component, proper mounting is required.
Consult the heatsink manufacturer for ther-
mal resistance and heat sink design.
TO-220 Design Example:
Assume that VIN = 10V, VOUT = 5V, IOUT =
1.5A, TA = 50°C, θH= 1°C/W, θCH= 2°C/W,
and θJC= 3C°/W, where:
TA = ambient temperature,
θHA = heatsink to ambient thermal resis-
tance
θCH = case to heatsink thermal resistance
θJC = junction to case thermal resistance
The power calculated under these condi-
tions is:
PD = (VIN – VOUT) * IOUT = 7.5W.
And the junction temperature is calculated
as
TJ = TA + PD * (θHA + θCH + θJC) or
SPX29150
V
OUT
V
IN
6.8µF++10µF
Figure 19. Fixed Output Linear Regulator Figure 20. Adjustable Output Linear Regulator
TJ = 50 + 7.5 * (1+2+3) = 95°C
Reliable operation is insured.
Capacitor Requirements
The output capacitor is needed to insure
stability and minimize the output noise. The
value of the capacitor varies with the load.
However, a minimum value of 10µF alumi-
num capacitor will guarantee stability over all
load conditions. A tantalum capacitor is rec-
ommended if a faster load transient response
is needed. If the power source has a high
AC impedance, a 0.1µF ceramic capacitor
between input & ground is recommended.
The output capacitors maximum ESR value
for stable operation is 0.33ohms.
Minimum Load Current
To ensure proper behavior of the regulator
under light loads, a minimum load of 5mA
for SPX29150/51/52/53 is required.
Typical Application Circuits
Figure 19 represents a typical xed output
regulator. Figure 20 represents an adjustable
output regulator. The values of R1 and R2
set the output voltage value as follows: VOUT
=VREF * [1 + (R1/R2)]. A minimum value of
10kΩ is recommended for R2 with a range
between 10kΩ and 47kΩ.
APPLICATION INFORMATION
SPX29152
V
OUT
V
IN
GND ADJ
1
23
4
5R1
R2
6.8µF
+ + 10µF
8
REV B 06/05/08 SP29150/51/52/53 1.5A Low Dropout Voltage Regulator © Copyright 2008 Exar Corporation
PACKAGE PINOUTS
*Tab is internally connected to GND
TO-263-3 Package (T)
V
OUT
GNDV
IN
Front View
1 2 3
OUTPUT
TO-263-5 Package (T5)
Top View
4 5321
GND
FLAG
1)
3)
4)
5)
2)INPUT
ENABLE
GND
ADJUST
1)
3)
4)
5)
2) INPUT
ENABLE
GND
ADJUST
1)
3)
4)
5)
2) INPUT
FLAG
OUTPUT OUTPUT
SPX29151 SPX29152 SPX29153
Front View
TO-220-3Package (U)
V
IN
V
OUT
GND
TO-220-5Package (U5)
Top View
1 2 3 4 5
OUTPUT
GND
FLAG
1)
3)
4)
5)
2)INPUT
ENABLE
OUTPUT
GND
ADJUST
1)
3)
4)
5)
2) INPUT
ENABLE
OUTPUT
GND
ADJUST
1)
3)
4)
5)
2) INPUT
FLAG
SPX29151 SPX29152 SPX29153
321
9
REV B 06/05/08 SP29150/51/52/53 1.5A Low Dropout Voltage Regulator © Copyright 2008 Exar Corporation
FOR SIPEX
APPROVAL
PACKAGE: 3 PIN TO-263
MIN NOM MAX MIN NOM MAX
A 0.160 -0.190 4.06 - 4.83
A1 0.000 -0.010 0.00 -0.25
b0.020 -0.039 0.51 -0.99
b2 0.045 - 0.070 1.14 - 1.78
c0.015 -0.029 0.38 - 0.74
c2 0.045 - 0.065 1.14 - 1.65
D 0.330 -0.380 8.38 -9.65
D1 0.270 - - 6.86 - -
E 0.380 - 0.420 9.65 - 10.67
E1 0.245 - - 6.22 - -
e
H 0.575 - 0.625 14.61 - 15.88
L0.070 - 0.110 1.78 - 2.79
L1 - - 0.066 - - 1.68
L3
O0˚ - 8˚ 0˚ - 8˚
Inches
Controlling Dimension
Millimeters
Conversion Factor:
1 Inch = 25.40 mm
EXAR Pkg Signoff Date/Rev: JL Aug5-05 / Rev A
0.25 BSC.010 BSC
SYMBOL
3 Pin TO-263 JEDEC TO-263 Variation AA
2.54 BSC.100 BSC
DETAIL C
L
Gauge Plane
A1
Seating
Plane
L3
θ
c
C2
A
H
Seating
Plane
Chamfer
Optional
SIDE VIEW
See Detail C
E1
D1
(L1)
Thermal
Pad
BACK
VIEW
L1
FRONT VIEW
E
D
b2
e
b
E/2
1 2 3
10
REV B 06/05/08 SP29150/51/52/53 1.5A Low Dropout Voltage Regulator © Copyright 2008 Exar Corporation
PACKAGE: 5 PIN TO-263
(L1)
E1
D1
Thermal
Pad
BACK VIEW
E
D
L1
e
b
123
E/2
FRONT VIEW
45
DETAIL C
L
Gauge Plane
A1
Seating
Plane
L3
θ
c
C2
A
H
Seating
Plane
See Detail C
Chamfer
Optional
SIDE VIEW
SYMBOL MIN NOM MAX MIN NOM MAX
A 0.160 -0.190 4.06 - 4.83
A1 0.000 -0.010 0.00 -0.25
b0.020 -0.039 0.51 -0.99
c0.015 -0.029 0.38 - 0.74
c2 0.045 - 0.065 1.14 - 1.65
D 0.330 -0.380 8.38 -9.65
D1 0.270 - - 6.86 - -
E 0.380 - 0.420 9.65 - 10.67
E1 0.245 - - 6.22 - -
e
H 0.575 - 0.625 14.61 - 15.88
L0.070 - 0.110 1.78 - 2.79
L1 - - 0.066 - - 1.68
L3
O0˚ - 8˚ 0˚ - 8˚
EXAR Pkg Signoff Date/Rev: JL Jun12-06 / Rev B
.067 BSC
.010 BSC
1.702 BSC
0.254 BSC
5 Pin TO-263 JEDEC TO-263 Variation BA
Dimensions in Inches:
Controlling Dimension
Dimensions in Millimeters
Conversion Factor:
1 Inch = 25.40 mm
11
Rev B 06/05/08 SP29150/51/52/53 1.5A Low Dropout voltage Regulator © Copyright 2008 Exar Corporation
foR SiPex
APPRovAL
PACKAGE: 3 PIN TO-220
EXAR CORPORATION
12
Rev B 06/05/08 SP29150/51/52/53 1.5A Low Dropout voltage Regulator © Copyright 2008 Exar Corporation
PACKAGE: 5 PIN TO-220
11
Rev B 06/05/08 SP29150/51/52/53 1.5A Low Dropout voltage Regulator © Copyright 2008 Exar Corporation
foR SiPex
APPRovAL
PACKAGE: 3 PIN TO-220