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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.
Features
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D2PAK D2T SUFFIX CASE 936A Tab = Ground Pin 1. Shutdown 2. Vin 3. Ground 4. Vout 5. Soft-Start
* * * * * * * * * * * *
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 0C to 125C Junction Temperature Range Pb-Free Packages are Available Microprocessor Power Supplies SMPS Post Regulation Battery Chargers DSP Power Supplies
MARKING DIAGRAM
Applications
NC P631GD2T AWLYWWG
2 INPUT Cin 1 NCP631 3 Shutdown
4 5 Cs Cout Vout 3.47
NCP631GD2T = Device Code A = Assembly Location WL = Wafer Lot Y = Year WW = Work Week G = Pb-Free Package
ORDERING INFORMATION
Device NCP631GD2TR4 Package D2PAK D2PAK (Pb-Free) NCP631GD2T NCP631GD2TG D2PAK D2PAK (Pb-Free) For information on tape and reel specifications, including part orientation and tape sizes, please refer to our Tape and Reel Packaging Specifications Brochure, BRD8011/D. 50 Units / Tube 50 Units / Tube Shipping 800/Tape & Reel 800/Tape & Reel
Figure 1. Typical Application Circuit
NCP631GD2TR4G
(c) Semiconductor Components Industries, LLC, 2006
1
April, 2006 - Rev. 5
Publication Order Number: NCP631/D
NCP631
PIN DESCRIPTION
Pin No. 1 Symbol Shutdown Description 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. Positive Power Supply Input Voltage Power Supply Ground
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2 Vin 3, Tab 4 5 Ground Vout Regulated Output Voltage Soft-Start 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
Symbol Vin Enable Vout
Value 9.0
Unit V V V
Input Voltage (Note 1) Shutdown Voltage Output Voltage Power Dissipation and Thermal Characteristics Case 936A (D2PAK) Power Dissipation (Note 2) Thermal Resistance, Junction-to-Ambient Thermal Resistance, Junction-to-Case Operating Junction Temperature Range Storage Temperature Range
-0.3 to 7 -0.3 to Vin + 0.3
PD RqJA RqJC TJ Tstg
Internally Limited 45 5.0 -40 to 125 -55 to 150
W C/W C/W C C
Stresses exceeding Maximum Ratings may damage the device. Maximum Ratings are stress ratings only. Functional operation above the Recommended Operating Conditions is not implied. Extended exposure to stresses above the Recommended Operating Conditions may affect device reliability. 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 RqJA
VIN THERMAL SHUTDOWN
VOUT
+ - - + SHUTDOWN - + VREF2 Soft-Start GND VREF1 (Band Gap) ~ 1.25 V
Figure 2. Simplified Block Diagram
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NCP631
ELECTRICAL CHARACTERISTICS (Cin = 68 mF, Cout = 47 + 470 mF, Vin = Vout + 1.5 V, Iout = 10 mA, for typical value TJ = 25C, for
min and max values TJ = 0C to 125C unless otherwise noted.) Characteristic Output Voltage (Vin = 5.0 V to 7.0 V, Iout = 10 mA to 3.0 A, TJ = 25C) (Vin = 5.0 V to 7.0 V, Iout = 10 mA to 3.0 A, TJ = 0C to 125C) Line Regulation (TJ = 25C) (Note 3) (Vin = Vout + 1.5 V to 7.0 V) (Vin = Vout + 1.5 V to 7.0 V, TJ = 0C to 125C) Load Regulation (TJ = 25C) (Note 3) (Iout = 10 mA to 3.0 A, TJ = 25C) (Iout = 10 mA to 3.0 A, TJ = 0C to 125C) Dropout Voltage (Measured at Vout - 2%) (Iout = 300 mA) (Iout = 3.0 A) Ground Pin Current in Normal Mode (Iout = 300 mA) (Iout = 3.0 A) Ground Pin Current in Shutdown Mode (Vshutdown < 0.8) Peak Output Limit Internal Current Limitation Thermal Shutdown Shutdown Input Threshold Voltage (Voltage Increasing, Output Turns On, Logic High) (Voltage Decreasing, Output Turns Off, Logic Low) Shutdown Input Low Current (Vin = 0.8 V), (Negative Current Flows out of Pin) Shutdown Input High Current (Vin = 2.0 V), (Negative Current Flows out of Pin) Ripple Rejection (Cout = 100 mF, f = 1.0 kHz) Soft-Start Pin Current Vtth(shutdown) 2.0 - IIL IIH RR - ISS - 76 11 - - mA -10 -10 - - -2.0 -2.0 - 0.8 - - mA mA dB Symbol Vadj 3.418 3.383 Regline - - Regload - - Vin-Vout - - IGnd - - IGnd - Iout 3.0 - - 40 - 5.2 155 75 - - - A A C V 0.4 1.0 1.0 2.0 mA 0.75 1.0 1.0 1.25 mA 0.01 0.06 - - V 0.02 0.06 - - % 3.470 - 3.522 3.557 % Min Typ Max Unit V
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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NCP631
3.485 Vout, OUTPUT VOLTAGE (V) 3.480 3.475 3.470 3.465 3.460 3.455 3.450 3.445 -40 -15 10 35 60 85 110 130 Isc, SHORT CIRCUIT CURRENT LIMIT (A) 8 7 6 5 4 3 2 1 0 -40 -15 10 35 60 85 110 130
TA, AMBIENT TEMPERATURE (C)
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 Vin - Vout, DROPOUT (V) 0.8 0.6 Iout = 300 mA 0.4 0.2 0 -40 Iout = 3.0 A
1.2 1.0 0.8 0.6 0.4 0.2 0 -40 Iout = 3.0 A
Iout = 300 mA
-15
10
35
60
85
110
130
-15
10
35
60
85
110
130
TA, AMBIENT TEMPERATURE (C)
TA, AMBIENT TEMPERATURE (C)
Figure 5. Dropout Voltage vs. Temperature
50 IGND, GROUND CURRENT (mA)
Figure 6. Ground Current vs. Temperature
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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NCP631
1.200 1.000 NOISE VALUE (mV) 0.800 0.600 0.400 0.200 0.000 1 10 100 1,000 10,000 100,000 1,000,000 f, FREQUENCY (Hz) 120 100 80 40 40 20 0 10 Vin = 5.0 V + 0.5 Vpp Cout = 100 mF, Al Electrolytic Iout = 10 mA
Vin = 4.47 V Cout = 33 mF Cin = 100 mF Iout = 10 mA
RIPPLE REJECTION (dB)
100
1,000 f, FREQUENCY (Hz)
10,000
100,000
Figure 8. Noise Characterization
Figure 9. Ripple Rejection vs. Frequency
Vin, INPUT VOLTAGE (V)
7 6 5
Vin, INPUT VOLTAGE (V) Cin = 68 mF, Al Electrolytic Cout = 33 mF, Al Electrolytic Iout = 200 mA OUTPUT VOLTAGE DEVIATION (mV)
7 6 5
OUTPUT VOLTAGE DEVIATION (mV)
50 40 30 20 10 0 0 100 200 300 TIME (mS) 400 500 600
60 40 20 0 Cin = 1.0 mF Cout = 33 mF, Al Electrolytic Iout = 200 mA
-20 -40 0 10 20 30 TIME (mS) 40 50 60
Figure 10. Line Transient
Figure 11. Line Transient
Iout, OUTPUT CURRENT (A)
4.5 3.0 1.5 Iout = 100 mA to 3.0 A 0
OUTPUT VOLTAGE DEVIATION (mV)
0 -50 -100 -150 0 10 20 Cin = 68 mF, Al Electrolytic Cout = 33 mF, Al Electrolytic Vin = 5.0 V 30 TIME (mS) 40 50 60
Figure 12. Load Transient
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NCP631
APPLICATIONS INFORMATION
Input Capacitor
The minimum capacitance required for stability is a 68 mF aluminum electrolytic or tantalum capacitor. The maximum ESR allowed for stability is 5.0 W. 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.
Output Capacitor
Where:
Iss + 11 mA Cs + 10 nF (typ) Vref + 1.2 V Vout + 3.47 V
(eq. 2)
Output current limitation during start-up:
V Iout + out * Cout * Iss Vref Cs
(eq. 3)
A minimum output capacitor value of 33 mF 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 W 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.
Soft-Start Function
An example for Cout = 500 mF, 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
(eq. 5)
Slope of the output voltage during startup (Shutdown pin goes from low to high) can be adjusted by value of Cs capacitor. The basic formula for this function is:
dV + Iss + Iout * Vref dt Cs Cout Vout
SHUTDOWN VOLTAGE (V) 2 (eq. 1)
An example for Cs = 10 nF:
Ts + 1.2 * 10E * 9 + 1.09 ms 11E * 6
(eq. 6)
0 2
Vcs, SOFT-START CAPACITOR VOLTAGE (V) Vout, OUTPUT VOLTAGE (V)
1
0 4
2
0 Vin = 5.5 V, Rout = 6.0 W, Cs = 10 nF Cout = 385 mF + 33 mF + 22 mF 3 2 1 0 0 0.2 0.4 0.6 0.8 1.0 TIME (mS) 1.2 1.4 1.6 1.8 2.0
Iout, OUTPUT CURRENT (A)
Figure 13. Typical Soft-Start Condition
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NCP631
Reverse Current
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.
Thermal Considerations
substitute for proper heatsinking. The maximum device power dissipation can be calculated by:
PD + TJ(max) * TA RqJA
(eq. 7)
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 155C, 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
TAPE AND REEL SPECIFICATION
SOP Description D2PAK Leads 5 Package Length 9.2 mm Package Width 10 mm
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, RqJA, by utilizing the printed circuit board copper as a heat dissipater. Figure 13 shows typical RqJA 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 RqJA 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.
Package Thickness 4.4 mm
Reel Quantity 800
Tape Pitch 16 mm
Tape Width 24 mm
Vendor P/N DDPAK-B
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NCP631
2.0 0.1 0.30 $ 0.05 R 0.3 MAX 4.0 0.1 See Note #2 1.55 0.05 1.50 MIN B 1.75 0.1
0.70 Max 20 Max 2.40 Max 9.00 11.15 A 4.70 K0 SECTION B-B A0 16.00 A0 = 10.60 0.15 B0 = 16.50 0.15 K0 = 4.90 0.15 B A
11.5 0.1 B0 24.0 0.3
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
Nominal Hub Depth 4 mm 8 mm 16 mm 28 mm
W1 +3
-2
W2MAX 7.1 11.1 19.1 31.1
4.4 8.4 16.4 28.4
Figure 15. Reel Dimensions
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NCP631
PACKAGE DIMENSIONS
D2PAK 5 CASE 936A-02 ISSUE C
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. 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
-T- A K B
12345 OPTIONAL CHAMFER
TERMINAL 6
E
U V
S H M L
D 0.010 (0.254)
M
T
N G R
P
C
DIM A B C D E G H K L M N P R S U V
SOLDERING FOOTPRINT*
8.38 0.33
1.702 0.067 10.66 0.42 1.016 0.04
3.05 0.12 16.02 0.63
SCALE 3:1
mm inches
*For additional information on our Pb-Free strategy and soldering details, please download the ON Semiconductor Soldering and Mounting Techniques Reference Manual, SOLDERRM/D.
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 and its officers, employees, subsidiaries, affiliates, and distributors harmless against all claims, costs, damages, and expenses, and reasonable attorney fees arising out of, directly or indirectly, any claim of personal injury or death associated with such unintended or unauthorized use, even if such claim alleges that SCILLC was negligent regarding the design or manufacture of the part. SCILLC is an Equal Opportunity/Affirmative Action Employer. This literature is subject to all applicable copyright laws and is not for resale in any manner.
PUBLICATION ORDERING INFORMATION
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NCP631/D

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