1
Rev. 3/11/02
SP29300/01/02/03 3A Low Dropout Voltage Regulator
Copyright 2002 Sipex Corporation
3A High Current, Low Dropout Voltage Regulator
Adjustable & Fixed Output, Fast Response Time
SPX29300/01/02/03
DESCRIPTION
FEATURES
s
Adjustable Output Down To 1.25V
s
1% Output Accuracy
s
Output Current of 3A
s
Low Dropout Voltage of 550mV @
3A
s
Extremely Tight Load and Line
Regulation
s
Extremely Fast Transient Response
s
Reverse-Battery Protection
s
Zero Current Shutdown (5 pin version)
s
Error Flag Signal Output for Out of
Regulation State (5 pin version)
s
Standard TO-220 and TO-263
Packages
The SPX29300/01/02/03 are 3A, highly accurate voltage regulators with a low drop out
voltage of 550mV dropout (typical) @ 3A. These regulators are specifically designed for low
voltage 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 SPX29300/01/02/03 are offered in 3 & 5-pin TO-220 & TO-263 packages. For a 1.5A
version, refer to the SPX29150 data sheet.
APPLICATIONS
s
Powering VGA & Sound Card
s
Power PCTM Supplies
s
SMPS Post Regulator
s
High Efficiency "Green" Computer
Systems
s
High Efficiency Linear Power Supplies
s
Constant Current Regulators
s
Adjustable Power Supplies
s
Battery Charger
Figure 1. Fixed Output Linear Regulator
Figure 2. Adjustable Output Linear Regulator
SPX29302
V
OUT
V
IN
GND
ADJ
1
2
3
4
5
R1
R2
6.8F
+
+
10F
SPX29300
V
OUT
V
IN
6.8F
+
+
10F
1
2
3
Rev. 3/11/02
SP29300/01/02/03 3A Low Dropout Voltage Regulator
Copyright 2002 Sipex Corporation
2
ABSOLUTE MAXIMUM RATINGS
Lead Temperature (soldering, 5 seconds) ................260
C
Storage Temperature Range........................-65
C to +150
C
Operating Junction Temperature Range......-40
C to +125
C
Input Voltage (Note 7) .................................................... 16V
ELECTRICAL CHARACTERISTICS
(Note 1) at V
IN
=V
OUT
+ 1V and I
OUT
= 10mA, C
IN
= 6.8
F, C
OUT
= 10
F, T
A
= 25
C, unless otherwise specified. The Boldface
applies over the junction temperature range.
SPX29300/01
PARAMETER
CONDITIONS
TYP
MIN
MAX
UNITS
Fixed Voltage Options
1.8V Version
Output Voltage
I
OUT
= 10mA
1.800
1.782
1.818
V
10mA
I
OUT
3A, 2.8V
V
IN
16V
1.800
1.764
1.836
2.5V Version
Output Voltage
I
OUT
= 10mA
2.500
2.475
2.525
V
10mA
I
OUT
3A, 3.5V
V
IN
16V
2.500
2.450
2.550
3.3V Version
Output Voltage
I
OUT
= 10mA
3.300
3.267
3.333
V
10mA
I
OUT
3A, 4.3V
V
IN
16V
3.300
3.234
3.366
5.0V Version
Output Voltage
I
OUT
= 10mA
5.000
4.950
5.050
V
10mA
I
OUT
3A, 6.0V
V
IN
16V
5.000
4.900
5.100
All Voltage Options
SPX29300/01/02/03
Line Regulation
I
OUT
=10mA,(V
OUT
+1V)
V
IN
16V
0.5
%
Load Regulation
V
IN
=V
OUT
+1V, 10mA
I
OUT
I
FL
(Note 2)
0.2
1
%
V/
T
V
OUT
Temp Coefficient (Note 6)
20
100
ppm/
C
Dropout Voltage, except
I
OUT
=100mA
50
175
mV
1.8V, (Note 3)
I
OUT
=1.5A
250
I
OUT
=3.0A
550
750
Ground Current
I
OUT
=1.5A
16
55
mA
(Note 5)
I
OUT
=3.0A
66
Ground Pin Current
V
IN
=0.5V less than specified V
OUT,
0.9
mA
at Dropout
I
OUT
=10mA
Current Limit
V
OUT
=0V (Note 4)
4.5
3.0
A
Output Noise Voltage
C
L
=10
F
400
V
RMS
(10Hz to 100kHz)
I
L
=100mA
C
L
=33
F
260
Reference Voltage
Adjustable version only
1.240
1.228
1.252
V
1.215
1.265
Reference Voltage
Adjustable version only (Note 8)
1.203
1.277
V
Adjust Pin Bias Current
40
80
nA
120
Reference Voltage
(Note 7)
20
ppm/
C
Temp. Coeff.
Adjust Pin Bias
0.1
nA/
C
Current Temp. Coeff.
3
Rev. 3/11/02
SP29300/01/02/03 3A Low Dropout Voltage Regulator
Copyright 2002 Sipex Corporation
ELECTRICAL CHARACTERISTICS
at V
IN
=V
OUT
+ 1V and I
OUT
= 10mA, C
IN
= 6.8
F, C
OUT
= 10
F, T
A
= 25
C, unless otherwise specified. The Boldface applies
over the junction temperature range. Adjustable versions are set to 5.0V.
PARAMETER
CONDITIONS
TYP
MIN
MAX
UNITS
FLAG OUTPUT (ERROR COMPARATOR)
SPX29301/03
Output Leakage
V
OH
=16V
0.01
1
A
Current
2
Output Low Voltage
Device set for 5V,V
IN
=4.5V, I
OL
=250
A
220
300
mV
400
Upper Threshold
Device set for 5V, (Note 9)
60
40
mV
Voltage
25
Lower Threshold
Device set for 5V, (Note 9)
75
95
mV
Voltage
140
Hysteresis
Device set for 5V, (Note 9)
15
mV
ENABLE Input
SPX29301/02
Input Logic Voltage
Low (OFF)
V
IN
<10V
0.8
V
High (ON)
2.4
ENABLE Input Pin
V
EN
=16V
100
600
A
750
V
EN
=0.8V
1
A
2
Regulator Output
(Note 10)
10
500
A
Current in Shutdown
Thermal Resistance
TO-200 Junction to Case, at Tab
3
C/W
TO-220 Junction to Ambient
60
TO-263Junction to Case, at Tab
3
TO-263 Junction to Ambient
60
NOTES:
Note 1: Maximum positive supply voltage of 20V must be of limited duration (<100m_) < 1%. The maximum continuous supply voltage is 16V.
Note 2: Full load current (I
FL
) is defined as 3.0A.
Note 3: Dropout voltage is defined as the input to output differential when the output voltage drops to 99% of its nominal value.
Note 4: 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 5: 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 6: Output voltage temperature coefficient is defined as the worst case voltage change divided by the total temperature range
Note 7: Thermal regulation is defined as the change in output voltage at time T after a change in power dissipation is applied, excluding load / line regulation effects.
Specifications for a 200mA load pulse as V
IN
= 20V (a 4W pulse) for t = 10ms.
Note 8: V
REF
V
OUT
(V
IN
-1), 2.3V
V
IN
16V, 10mA
I
L
I
FL
, T
j
< T
jmax
.
Note 9: 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. Threshold 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 10: V
EN
0.8V and V
IN
16V, V
OUT
= 0.
Reference
Thermal
Shutdown
EN
IN
OUT
ADJ
GND
O.V
I
LIMIT
28V
R1*
R2*
1.180V
1.240V
+
+
-
-
FLAG
BLOCK DIAGRAM
Rev. 3/11/02
SP29300/01/02/03 3A Low Dropout Voltage Regulator
Copyright 2002 Sipex Corporation
4
TYPICAL PERFORMANCE CHARACTERISTICS
Figure 3. Dropout Voltage vs Load Current
Figure 4. Line Regulation
Figure 5. Ground Current vs Load Current
Figure 6. Load Regulation
Figure 7. Enable Threshold vs Temperature
0
200
400
600
800
1000
0
1.0
2.0
3.0
IL (A)
3.3V Device
CL = 10F
Vdropout (mV)
1200
Vin = 3.2V
85C
25C
2.460
2.470
2.480
2.490
2.500
2.510
2.520
2.530
2.540
4
6
8
10
12
14
16
Vin (V)
2.5V Device
IL = 10mA
CL = 10F
Vout (V)
0.0
10.0
20.0
30.0
40.0
50.0
60.0
70.0
80.0
0
1.0
2.0
3.0
IL (A)
3.3V Device
Vin = 4.3V
CL = 10F
Ignd (mA)
85C
25C
3.280
3.285
3.290
3.295
3.300
3.305
3.310
0
1.0
2.0
3.0
IL (A)
Vin = 4.3V
CL = 10F
3.3V Device
Vout (V )
1.2
1.3
-40
-20
0
20
40
60
80
100
120
Temperature (
o
C)
3.3V Device
Vth (V)
1.4
1.5
1.6
1.7
1.8
1.9
5
Rev. 3/11/02
SP29300/01/02/03 3A Low Dropout Voltage Regulator
Copyright 2002 Sipex Corporation
APPLICATION INFORMATION
The SPX29300/01/02/03 incorporates protec-
tion against over-current faults, reversed load
insertion, over temperature operation, and
positive and negative transient voltage.
Thermal Considerations
Although the SPX29300/01/02/03 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 flow through the lowest
resistance path, the junction-to-case path. In
order to insure the best thermal flow of the
component, proper mounting is required.
TO-220 Design Example:
Assume that V
IN
= 10V, V
OUT
= 5V, I
OUT
=
1.5A, T
A
= 50
C,
HA
= 1
C/W,
CH
= 2
C/W,
and
JC
= 3C
/W, where:
T
A
= ambient temperature,
HA
= heatsink to ambient thermal
resistance
CH
= case to heatsink thermal
resistance
JC
= junction to case thermal
resistance
The power calculated under these conditions
is:
P
D
= (V
IN
V
OUT
) * I
OUT
= 7.5W.
And the junction temperature is calculated as
T
J
= T
A
+ P
D
* (
HA
+
CH
+
JC
) or
T
J
= 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 10
F alumi-
num capacitor will guarantee stability over all
load conditions. A tantalum capacitor is
recommended if a faster load transient
response is needed. If the power source has a
high AC impedance, a 0.1
F ceramic capaci-
tor between input & ground is recommended.
Minimum Load Current
To ensure a proper behavior of the regulator
under light load, a minimum load of 5mA for
SPX29300/01/02/03 is required.
Adjustable Regulator Design
The SPX29302/03 are adjustable regulators
that can be programmed to any value between
1.25V and 16V using 2 resistors, R1 and R2.
The relationship between the resistors is:
R1 = R2(Vout/1.240-1).
Error Flag
The SPX29301/03 features an error flag that
indicates either an over current or under
voltage condition. The flag output goes low,
sinking 10mA when either condition occurs.
Enable Input
The SPX29301/02 have an Enable function
that switches the regulator on and off. Their
thresholds are TTL compatible. When the
regulator is active, approximately 20 uA flows
through the Enable pin.
Typical Application Circuits
Figure 1 represents at typical fixed output
regulator. Figure 2 represents an adjustable
output regulator. The values of R1 and R2 set
the output voltage value as follows:
V
OUT
=V
REF
* [1 + (R1/R2)].
For best results, the total series resistance
should be small enough to pass a minimum
regulator load current of 5 mA. A minimum
value of 10kohms is recommended for R2
with a range between 10kohms and 47 kohms.
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