ON NCP631 3.0 a linear voltage regulator with soft start Datasheet

NCP631
3.0 A Linear Voltage
Regulator with Soft Start
The NCP631 is a low dropout positive voltage regulator that is
capable of providing a guaranteed output current of 3.0 A with a
maximum dropout voltage of 1.25 V at 3.0 A over temperature. The
NCP631 is currently offered as a fixed voltage version at 3.47 V. On
chip trimming adjusts the reference/output voltage to within 1.5%
accuracy. The soft start function allows control of start up times. This
prevents current spikes at start up due to output capacitor in-rush
current. Internal protection features consist of output foldback current
limiting, and thermal shutdown. The NCP631 is available in D2PAK
package.
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D2PAK
D2T SUFFIX
CASE 936A
1
5
Tab = Ground
Pin 1. Shutdown
2. Vin
3. Ground
4. Vout
5. Soft Start
Features
•
•
•
•
•
•
•
Output Current of 3.0 A
1.25 V Maximum Dropout Voltage at 3.0 A Over Temperature
Voltage on Shutdown Pin is TTL compatible
Reference/Output Voltage Trimmed to 1.5 %
Current Limit Protection
Thermal Shutdown Protection
0°C to 125°C Junction Temperature Range
MARKING
DIAGRAM
Applications
•
•
•
•
Microprocessor Power Supplies
SMPS Post Regulation
Battery Chargers
DSP Power Supplies
2
INPUT
Cin
1
NC
P631GD2T
AWLYWW
4
NCP631
3
5
Cout
Cs
Vout
3.47
ORDERING INFORMATION
Shutdown
Figure 1. Typical Application Circuit
 Semiconductor Components Industries, LLC, 2003
April, 2003 - Rev. 3
NCP631 = Specific Device Code
A
= Assembly Location
WL = Wafer Lot
Y
= Year
WW = Work Week
1
Device
VOUT
Package
Shipping
NCP631GD2TR4
3.47
D2PAK
800/Tape
& Reel
Publication Order Number:
NCP631/D
NCP631
PIN DESCRIPTION
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Pin No.
Symbol
Description
1
Shutdown
This input is used to place the NCP631 into shutdown mode. The NCP631 is active when a voltage greater than
2.0 V is applied. The NCP631 will be placed into a shutdown mode when a voltage less then 0.8 V is applied. If left
unused then connect the pin high.
2
Vin
3, Tab
Ground
4
Vout
5
Soft Start
Positive Power Supply Input Voltage
Power Supply Ground
Regulated Output Voltage
Soft start capacitor is placed from this pin to ground. Refer to applications information section on Page 6 for
proper capacitor selection.
MAXIMUM RATINGS
Rating
Input Voltage (Note 1)
Shutdown Voltage
Symbol
Value
Unit
Vin
9.0
V
Enable
-0.3 to 7
V
Output Voltage
Vout
-0.3 to Vin + 0.3
V
Power Dissipation and Thermal Characteristics
Case 936A (D2PAK)
Power Dissipation (Note 2)
Thermal Resistance, Junction-to-Ambient
Thermal Resistance, Junction-to-Case
PD
RJA
RJC
Internally Limited
45
5.0
W
°C/W
°C/W
Operating Junction Temperature Range
TJ
-40 to 125
°C
Storage Temperature Range
Tstg
-55 to 150
°C
1. This device series contains ESD protection and exceeds the following tests:
Human Body Model JESD 22-A114-B
Machine Model JESD 22-A115-A
2. The maximum package power dissipation is:
T (max) TA
PD J
RJA
VIN
VOUT
THERMAL
SHUTDOWN
+
−−
+
SHUTDOWN
VREF1
(Band Gap)
~ 1.25 V
−
+
VREF2
SOFT START
GND
Figure 2. Simplified Block Diagram
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2
NCP631
ELECTRICAL CHARACTERISTICS (Cin = 68 F, Cout = 47 + 470 F, Vin = Vout + 1.5 V, Iout = 10 mA, for typical value TJ = 25°C, for
min and max values TJ = 0°C to 125°C unless otherwise noted.)
Symbol
Min
Typ
Max
3.418
3.383
3.470
-
3.522
3.557
-
0.02
0.06
-
-
0.01
0.06
-
-
0.75
1.0
1.0
1.25
-
0.4
1.0
1.0
2.0
-
40
75
3.0
-
-
A
Internal Current Limitation
-
5.2
-
A
Thermal Shutdown
-
155
-
°C
2.0
-
-
0.8
Characteristic
Output Voltage
(Vin = 5.0 V to 7.0 V, Iout = 10 mA to 3.0 A, TJ = 25°C)
(Vin = 5.0 V to 7.0 V, Iout = 10 mA to 3.0 A, TJ = 0°C to 125°C)
Vadj
Line Regulation (TJ = 25°C) (Note 3)
(Vin = Vout + 1.5 V to 7.0 V)
(Vin = Vout + 1.5 V to 7.0 V, TJ = 0°C to 125°C)
Regline
Load Regulation (TJ = 25°C) (Note 3)
(Iout = 10 mA to 3.0 A, TJ = 25°C)
(Iout = 10 mA to 3.0 A, TJ = 0°C to 125°C)
Regload
Dropout Voltage (Measured at Vout – 2%)
(Iout = 300 mA)
(Iout = 3.0 A)
Vin-V out
Ground Pin Current in Normal Mode
(Iout = 300 mA)
(Iout = 3.0 A)
IGnd
Ground Pin Current in Shutdown Mode
(Vshutdown < 0.8)
IGnd
Peak Output Limit
Iout
Shutdown Input Threshold Voltage
(Voltage Increasing, Output Turns On, Logic High)
(Voltage Decreasing, Output Turns Off, Logic Low)
Unit
V
%
%
V
mA
A
Vtth(shutdown)
V
Shutdown Input Low Current (Vin = 0.8 V), (Negative Current Flows out of Pin)
IIL
-10
-2.0
-
A
Shutdown Input High Current (Vin = 2.0 V), (Negative Current Flows out of Pin)
IIH
-10
-2.0
-
A
Ripple Rejection
(Cout = 100 F, f = 1.0 kHz)
RR
-
76
-
Soft Start Pin Current
ISS
-
11
-
dB
A
3. Low duty cycle pulse techniques are used during testing to maintain the junction temperature as close to ambient as possible.
4. Line regulation is defined as the change in output voltage for a change in input voltage. Load regulation is defined as the change in output
voltage for a change in output load current at a constant temperature. The limits for line and load regulation are contained within the reference
voltage specification, Vadj. Typical numbers are included in the specification for line and load regulation.
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3
Vout, OUTPUT VOLTAGE (V)
3.485
3.480
3.475
3.470
3.465
3.460
3.455
3.450
3.445
-40
-15
10
35
85
60
110
130
Isc, SHORT CIRCUIT CURRENT LIMIT (A)
NCP631
6
5
4
3
2
1
0
-40
-15
10
35
60
85
110
130
TA, AMBIENT TEMPERATURE (°C)
Figure 3. Output Voltage vs. Temperature
Figure 4. Short Circuit Limit vs. Temperature
1.2
IGND, GROUND CURRENT (mA)
1.0
0.8
Iout = 3.0 A
0.6
Iout = 300 mA
0.4
0.2
-15
10
35
60
110
85
130
1.0
0.8
Iout = 3.0 A
0.6
0.4
Iout = 300 mA
0.2
0
-40
10
-15
35
60
85
110
TA, AMBIENT TEMPERATURE (°C)
TA, AMBIENT TEMPERATURE (°C)
Figure 5. Dropout Voltage vs. Temperature
Figure 6. Ground Current vs. Temperature
50
IGND, GROUND CURRENT (A)
Vin - Vout, DROPOUT (V)
7
TA, AMBIENT TEMPERATURE (°C)
1.2
0
-40
8
40
30
Vshutdown = 0 V
20
10
0
-40
-15
10
35
60
85
110
130
TA, AMBIENT TEMPERATURE (°C)
Figure 7. Ground Pin Current in Shutdown Mode
vs. Temperature
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130
1.200
120
1.000
100
RIPPLE REJECTION (dB)
NOISE VALUE (V)
NCP631
0.800
0.600
0.400
Vin = 4.47 V
Cout = 33 F
Cin = 100 F
Iout = 10 mA
0.200
80
40
40
20
0
10
0.000
1
10
100
1,000
10,000
Vin = 5.0 V + 0.5 Vpp
Cout = 100 F, Al Electrolytic
Iout = 10 mA
100,000 1,000,000
100
Vin, INPUT
VOLTAGE (V)
6
5
OUTPUT VOLTAGE
DEVIATION (mV)
50
Cin = 68 F, Al Electrolytic
Cout = 33 F, Al Electrolytic
Iout = 200 mA
20
10
7
6
5
60
Cin = 1.0 F
Cout = 33 F, Al Electrolytic
Iout = 200 mA
40
20
0
-20
0
100
200
300
500
400
-40
600
0
10
20
TIME (S)
3.0
1.5
Iout = 100 mA to 3.0 A
0
0
-50
Cin = 68 F, Al Electrolytic
Cout = 33 F, Al Electrolytic
Vin = 5.0 V
-100
0
40
Figure 11. Line Transient
4.5
-150
30
TIME (S)
Figure 10. Line Transient
Iout, OUTPUT
CURRENT (A)
0
100,000
Figure 9. Ripple Rejection vs. Frequency
7
OUTPUT VOLTAGE
DEVIATION (mV)
OUTPUT VOLTAGE
DEVIATION (mV)
Vin, INPUT
VOLTAGE (V)
Figure 8. Noise Characterization
30
10,000
f, FREQUENCY (Hz)
f, FREQUENCY (Hz)
40
1,000
10
20
30
40
TIME (S)
Figure 12. Load Transient
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5
50
60
50
60
NCP631
APPLICATIONS INFORMATION
Input Capacitor
Where:
The minimum capacitance required for stability is a 68 F
aluminum electrolytic or tantalum capacitor. The maximum
ESR allowed for stability is 5.0 . The capacitor should be
place as close as possible to the input of the device.
The placement of a ceramic capacitor in parallel is not
recommend due to possible instabilities.
Iss 11 A
Cs 10 nF (typ)
Vref 1.2 V
Vout 3.47 V
Output current limitation during start-up:
A minimum output capacitor value of 33 F is required for
stability. The type of capacitor can be aluminum electrolytic
or tantalum capacitor. ESR can vary up to a maximum of
2.0 for stability. The capacitor should be placed as close
as possible to the output of the device.
The placement of a ceramic capacitor in parallel is not
recommend due to possible instabilities.
(eq. 3)
An example for Cout = 500 F, Cs = 10 nF:
Iout 3.47 * 500E 6 * 11E 6 1.59 A (eq. 4)
1.2
10E 9
Time when the output voltage will reach target value can be
determined by:
Ts Vref * Cs
Iss
Soft Start Function
(eq. 5)
An example for Cs = 10 nF:
Slope of the output voltage during start-up (Shutdown pin
goes from low to high) can be adjusted by value of Cs
capacitor. The basic formula for this function is:
SHUTDOWN
VOLTAGE (V)
V
Iout out * Cout * Iss
Vref
Cs
Output Capacitor
dV Iss Iout * Vref
dt
Cs
Cout Vout
(eq. 2)
Ts 1.2 * 10E 9 1.09 ms
11E 6
(eq. 6)
(eq. 1)
2
0
Vcs, SOFT-START
CAPACITOR
VOLTAGE (V)
2
1
0
Vout, OUTPUT
VOLTAGE (V)
4
2
Iout, OUTPUT
CURRENT (A)
0
Vin = 5.5 V, Rout = 6.0 , Cs = 10 nF
Cout = 385 F + 33 F + 22 F
3
2
1
0
0
0.2
0.4
0.6
0.8
1.0
TIME (mS)
1.2
Figure 13. Typical Soft Start Condition
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6
1.4
1.6
1.8
2.0
NCP631
Reverse Current
substitute for proper heatsinking. The maximum device
power dissipation can be calculated by:
Some situations might occur were the output pin is raised
to a voltage while the input pin is at zero volts. This situation
will not damage the device.
If the output voltage is raised to a higher voltage than the
input voltage a diode is recommended from output to input
with the anode connect to the output pin.
PD TJ(max) TA
RJA
(eq. 7)
The devices are available in surface mount D2PAK
package. The package has an exposed metal tab that is
specifically designed to reduce the junction to air thermal
resistance, RJA, by utilizing the printed circuit board
copper as a heat dissipater. Figure 13 shows typical RJA
values that can be obtained from a square pattern using
economical single sided 2.0 ounce copper board material.
The final product thermal limits should be tested and
quantified in order to insure acceptable performance and
reliability. The actual RJA can vary considerably from the
graphs shown. This will be due to any changes made in the
copper aspect ratio of the final layout, adjacent heat sources,
and air flow.
Thermal Considerations
This series contains an internal thermal limiting circuit
that is designed to protect the regulator in the event that the
maximum junction temperature is exceeded. When
activated, typically at 155°C, the regulator output switches
off and then back on as the die cools. As a result, if the device
is continuously operated in an overheated condition, the
output will appear to be oscillating. This feature provides
protection from a catastrophic device failure due to
accidental overheating. It is not intended to be used as a
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NCP631
TAPE AND REEL SPECIFICATION
SOP
Description
Leads
Package
Length
Package
Width
Package
Thickness
Reel
Quantity
Tape
Pitch
Tape
Width
Vendor P/N
5
9.2 mm
10 mm
4.4 mm
800
16 mm
24 mm
DDPAK- B
D2PAK
∅ 1.55 ±0.05
2.0 ±0.1
0.30 0.05
4.0 ±0.1
See Note #2
R 0.3 MAX
1.75 ±0.1
∅ 1.50 MIN
B
0.70 Max
11.5 ±0.1
20°
Max
2.40
Max
B0
9.00
11.15
A
B
16.00
4.70
K0
24.0 ±0.3
A
A0 = 10.60 ±0.15
B0 = 16.50 ±0.15
K0 = 4.90 ±0.15
SECTION B-B
A0
ALL DIMENSIONS IN MILLIMETERS
0.30 0.05
SECTION A-A
1.00
NOTES:
1. A0 & B0 MEASURED AT 0.3 mm ABOVE BASE OF POCKET
2. 10 PITCHES CUMULATIVE TOTAL ±0.2 mm
Figure 14. Package Carrier Dimensions
Figure 15. Reel Dimensions
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Nominal
Hub Depth
W1 +3
4 mm
4.4
7.1
8 mm
8.4
11.1
16 mm
16.4
19.1
28 mm
28.4
31.1
W2MAX
-2
NCP631
PACKAGE DIMENSIONS
D2PAK
D2T SUFFIX
CASE 936A-02
ISSUE B
-TOPTIONAL
CHAMFER
A
TERMINAL 6
E
U
S
K
B
NOTES:
1. DIMENSIONING AND TOLERANCING PER ANSI
Y14.5M, 1982.
2. CONTROLLING DIMENSION: INCH.
3. TAB CONTOUR OPTIONAL WITHIN DIMENSIONS A
AND K.
4. DIMENSIONS U AND V ESTABLISH A MINIMUM
MOUNTING SURFACE FOR TERMINAL 6.
5. DIMENSIONS A AND B DO NOT INCLUDE MOLD
FLASH OR GATE PROTRUSIONS. MOLD FLASH
AND GATE PROTRUSIONS NOT TO EXCEED 0.025
(0.635) MAXIMUM.
V
H
1 2 3 4 5
M
D
0.010 (0.254)
M
T
L
P
N
G
DIM
A
B
C
D
E
G
H
K
L
M
N
P
R
S
U
V
R
C
RECOMMENDED FOOTPRINT
8.38
0.33
1.702
0.067
10.66
0.42
16.02
0.63
3.05
0.12
SCALE 3:1
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9
1.016
0.04
mm inches
INCHES
MIN
MAX
0.386
0.403
0.356
0.368
0.170
0.180
0.026
0.036
0.045
0.055
0.067 BSC
0.539
0.579
0.050 REF
0.000
0.010
0.088
0.102
0.018
0.026
0.058
0.078
5 REF
0.116 REF
0.200 MIN
0.250 MIN
MILLIMETERS
MIN
MAX
9.804 10.236
9.042
9.347
4.318
4.572
0.660
0.914
1.143
1.397
1.702 BSC
13.691 14.707
1.270 REF
0.000
0.254
2.235
2.591
0.457
0.660
1.473
1.981
5 REF
2.946 REF
5.080 MIN
6.350 MIN
NCP631
ON Semiconductor and
are registered trademarks of Semiconductor Components Industries, LLC (SCILLC). SCILLC reserves the right to make
changes without further notice to any products herein. SCILLC makes no warranty, representation or guarantee regarding the suitability of its products for any
particular purpose, nor does SCILLC assume any liability arising out of the application or use of any product or circuit, and specifically disclaims any and all
liability, including without limitation special, consequential or incidental damages. “Typical” parameters which may be provided in SCILLC data sheets and/or
specifications can and do vary in different applications and actual performance may vary over time. All operating parameters, including “Typicals” must be
validated for each customer application by customer’s technical experts. SCILLC does not convey any license under its patent rights nor the rights of others.
SCILLC products are not designed, intended, or authorized for use as components in systems intended for surgical implant into the body, or other applications
intended to support or sustain life, or for any other application in which the failure of the SCILLC product could create a situation where personal injury or death
may occur. Should Buyer purchase or use SCILLC products for any such unintended or unauthorized application, Buyer shall indemnify and hold SCILLC
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For additional information, please contact your local
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10
NCP631/D
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