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NCP566 1.5 A Low Dropout Linear Regulator
The NCP566 low dropout linear regulator will provide 1.5 A at a fixed output voltage. The fast loop response and low dropout voltage make this regulator ideal for applications where low voltage and good load transient response are important. Device protection includes current limit, short circuit protection, and thermal shutdown.
Features http://onsemi.com MARKING DIAGRAMS
AYM 566xx G G 1 xx = Voltage Rating 12 = 1.2 V 18 = 1.8 V 25 = 2.5 V A = Assembly Location Y = Year M = Date Code G = Pb-Free Package (Note: Microdot may be in either location)
* * * * * * * * * * * *
Ultra Fast Transient Response (t1.0 ms) Low Ground Current (1.5 mA @ Iout = 1.5 A) Low Dropout Voltage (0.9 V @ Iout = 1.5 A) Low Noise (37 mVrms) 1.2 V, 1.8 V, 2.5 V Fixed Output Versions. Other Fixed Voltages Available on Request Current Limit Protection Thermal Shutdown Protection These are Pb-Free Devices
SOT-223 CASE 318E
Typical Applications
Servers ASIC Power Supplies Post Regulation for Power Supplies Constant Current Source
PIN CONNECTIONS
Vin GND Vout
1 2 3 GND
ORDERING INFORMATION
See detailed ordering and shipping information in the package dimensions section on page 9 of this data sheet.
(c) Semiconductor Components Industries, LLC, 2007
1
March, 2007 - Rev. 0
Publication Order Number: NCP566/D
NCP566
PIN DESCRIPTION
Pin No. 1 Symbol Vin Description Positive Power Supply Input Voltage Power Supply Ground
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2, Tab 3 Ground Vout Regulated Output Voltage
MAXIMUM RATINGS
Rating
Symbol Vin Vout RqJA RqJP TJ TA Tstg
Value 9.0
Unit V V
Input Voltage (Note 1) Output Pin Voltage Thermal Characteristics (Notes 2, 3) Thermal Resistance, Junction-to-Ambient Thermal Resistance, Junction-to-Pin Operating Junction Temperature Range Operating Ambient Temperature Range Storage Temperature Range
-0.3 to Vin + 0.3 107 12 -40 to 150 -40 to 125 -55 to 150
C/W
C 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: TJ(max) * TA PD + RqJA 3. As measured using a copper heat spreading area of 50 mm2, 1 oz copper thickness.
Vin
Cin 150mF
Voltage Vref = 0.9 V Reference Output Block Stage R1 R2
Vout
Cout 150mF
GND GND
Figure 1. Typical Schematic
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NCP566
ELECTRICAL CHARACTERISTICS (Vin = Vout + 1.6 V, for typical values TJ = 25C, for min/max values TJ = -40C to +125C, Cin = Cout = 150 mF unless otherwise noted.)
Characteristic Output Voltage (10 mA < Iout < 1.5 A; 2.8 V < Vin < 9.0 V; TJ = -10 to 105C) 1.2 V version Output Voltage (10 mA < Iout < 1.5 A; 2.8 V < Vin < 9.0 V; TJ = -40 to 125C) 1.2 V version Output Voltage (10 mA < Iout < 1.5 A; 3.4 V < Vin < 9.0 V; TJ = -10 to 105C) 1.8 V version Output Voltage (10 mA < Iout < 1.5 A; 3.4 V < Vin < 9.0 V; TJ = -40 to 125C) 1.8 V version Output Voltage (10 mA < Iout < 1.5 A; 4.1 V < Vin < 9.0 V; TJ = -10 to 105C) 2.5 V version Output Voltage (10 mA < Iout < 1.5 A; 4.1 V < Vin < 9.0 V; TJ = -40 to 125C) 2.5 V version Line Regulation (Iout = 10 mA) Load Regulation (10 mA < Iout < 1.5 A) Dropout Voltage (Iout = 1.5 A) (Note 4) Current Limit Ripple Rejection (120 Hz; Iout = 1.5 A) Ripple Rejection (1 kHz; Iout = 1.5 A) Thermal Shutdown Ground Current (Iout = 1.5 A) Output Noise Voltage (f = 100 Hz to 100 kHz, Iout = 1.5 A) Iq Vn Symbol Vout Vout Vout Vout Vout Vout Regline Regload Vdo Ilim RR RR Min 1.176 (-2%) 1.164 (-3%) 1.764 (-2%) 1.746 (-3%) 2.450 (-2%) 2.425 (-3%) - - - 1.6 - - - - - Typ 1.2 1.2 1.8 1.8 2.5 2.5 0.02 0.04 0.9 3.5 85 75 160 1.5 37 Max 1.224 (+2%) 1.236 (+3%) 1.836 (+2%) 1.854 (+3%) 2.550 (+2%) 2.575 (+3%) - - 1.3 - - - - 3.0 - Unit V V V V V V % % V A dB dB C mA mVrms
4. Dropout voltage is a measurement of the minimum input/output differential at full load.
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NCP566
TYPICAL CHARACTERISTICS
2.53 VOUT, OUTPUT VOLTAGE (V) 2.52 2.51 2.50 2.49 2.48 2.47 -50 -25 Vout = 2.5 V Iout = 10 mA 0 25 50 75 100 125 150 VOUT, OUTPUT VOLTAGE (V) 1.820 1.815 1.810 1.805 1.800 1.795 1.790 1.785 1.780 -50 -25 0 25 50 75 Vout = 1.8 V Iout = 10 mA 100 125 150
TJ, JUNCTION TEMPERATURE (C)
TJ, JUNCTION TEMPERATURE (C)
Figure 2. Output Voltage vs. Temperature
3.80 3.75 3.70 3.65 3.60 3.55 3.50 -50
Figure 3. Output Voltage vs. Temperature
VOUT, OUTPUT VOLTAGE (V)
1.215 1.210 1.205 1.200 1.195 1.190 1.185 1.180 -50 -25 0 25 50 75 Vout = 1.2 V Iout = 10 mA 100 125 150
ISC, SHORT CIRCUIT CURRENT LIMIT (A)
1.220
-25
0
25
50
75
100
125
150
TJ, JUNCTION TEMPERATURE (C)
TJ, JUNCTION TEMPERATURE (C)
Figure 4. Output Voltage vs. Temperature
1.2 Vin - Vout, DROPOUT VOLTAGE (V) 1.0
Figure 5. Short Circuit Current Limit vs. Temperature
Iout = 1.5 A 0.8 0.6 0.4 0.2 0 -50 Iout = 50 mA
-25
0
25
50
75
100
125
150
TJ, JUNCTION TEMPERATURE (C)
Figure 6. Dropout Voltage vs. Temperature
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NCP566
TYPICAL CHARACTERISTICS
1.70 IGND, GROUND CURRENT (mA) 1.65 1.60 1.55 1.50 1.45 Iout = 1.5 A 1.40 -50 -25 0 50 100 25 75 125 TJ, JUNCTION TEMPERATURE (C) 150 IGND, GROUND CURRENT (mA) 1.80
1.75
1.70
1.65
1.60 1.55 0 300 600 900 1200 Iout, OUTPUT CURRENT (mA) 1500
Figure 7. Ground Current vs. Temperature
Figure 8. Ground Current vs. Output Current
100 90 RIPPLE REJECTION (dB) 80 70
1000
Unstable 100 ESR (W) Iout = 1.5 A 10 Stable 1 100 1000 10000 F, FREQUENCY (Hz) 100000 1000000 0 250 500 750 1000 Vout = 2.5 V Cout = 10 mF 1250 1500 OUTPUT CURRENT (mA)
60 50 40 30 20 10 0 10
Figure 9. Ripple Rejection vs. Frequency
Figure 10. Output Capacitor ESR Stability vs. Output Current
Vout = 1.2 V
Vout = 1.2 V
Figure 11. Load Transient from 10 mA to 1.5 A
Figure 12. Load Transient from 10 mA to 1.5 A
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NCP566
TYPICAL CHARACTERISTICS
Vout = 1.2 V
Vout = 1.2 V
Figure 13. Load Transient from 1.5 A to 10 mA
140 120 NOISE DENSITY (nV/Hz) 100 80 60 40 20 0 0 10 20 30 40 50 60 70 80 90 100 f, FREQUENCY (kHz) Vout = 1.2 V Iout = 10 mA NOISE DENSITY (nV/Hz) 140 120 100 80 60 40 20 0 0
Figure 14. Load Transient from 1.5 A to 10 mA
Vout = 1.2 V Iout = 1.5 A 10 20 30 40 50 60 70 80 90 100
f, FREQUENCY (kHz)
Figure 15. Noise Density vs. Frequency
Figure 16. Noise Density vs. Frequency
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NCP566
APPLICATION INFORMATION The NCP566 low dropout linear regulator provides fixed voltages at currents up to 1.5 A. It features ultra fast transient response and low dropout voltage. These devices contain output current limiting, short circuit protection and thermal shutdown protection.
Input, Output Capacitor and Stability
for use with a 150 mF OSCON 16SA150M type in parallel with a 10 mF OSCON 10SL10M type from Sanyo. The 10 mF capacitor is used for best AC stability while 150 mF capacitor is used for achieving excellent output transient response. The output capacitors should be placed as close as possible to the output pin of the device. If not, the excellent load transient response of NCP566 will be degraded.
Load Transient Measurement
An input bypass capacitor is recommended to improve transient response or if the regulator is located more than a few inches from the power source. This will reduce the circuit's sensitivity to the input line impedance at high frequencies and significantly enhance the output transient response. Different types and different sizes of input capacitors can be chosen dependent on the quality of power supply. A 150 mF OSCON 16SA150M type from Sanyo should be adequate for most applications. The bypass capacitor should be mounted with shortest possible lead or track length directly across the regulator's input terminals. The output capacitor is required for stability. The NCP566 remains stable with ceramic, tantalum, and aluminum- electrolytic capacitors with a minimum value of 1.0 mF with ESR between 50 mW and 2.5 W. The NCP566 is optimized
GEN
Large load current changes are always presented in microprocessor applications. Therefore good load transient performance is required for the power stage. NCP566 has the feature of ultra fast transient response. Its load transient responses in Figures 11 through 14 are tested on evaluation board shown in Figure 17. The evaluation board consists of NCP566 regulator circuit with decoupling and filter capacitors and the pulse controlled current sink to obtain load current transitions. The load current transitions are measured by current probe. Because the signal from current probe has some time delay, it causes un-synchronization between the load current transition and output voltage response, which is shown in Figures 11 through 14.
Vout -VCC Vin Pulse +
NCP566 Evaluation Board GND
V RL
+ GND Scope Voltage Probe
Figure 17. Schematic for Transient Response Measurement
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NCP566
PCB Layout Considerations Thermal Considerations
Good PCB layout plays an important role in achieving good load transient performance. Because it is very sensitive to its PCB layout, particular care has to be taken when tackling Printed Circuit Board (PCB) layout. For microprocessor applications it is customary to use an output capacitor network consisting of several capacitors in parallel. This reduces the overall ESR and reduces the instantaneous output voltage drop under transient load conditions. The output capacitor network should be as close as possible to the load for the best results.
Protection Diodes
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. This feature provides protection from a catastrophic device failure due to accidental overheating. It is not intended to be used as a substitute for proper heat sinking. The maximum device power dissipation can be calculated by:
PD +
200 180 160 qJA (C/W) 140 120 100 1 oz Cu 80 60 40 0 50 100 150 200 250 300 350 400 450 500 COPPER HEAT-SPREADER AREA (mm sq) 2 oz Cu
TJ(max) * TA RqJA
When large external capacitors are used with a linear regulator it is sometimes necessary to add protection diodes. If the input voltage of the regulator gets shorted, the output capacitor will discharge into the output of the regulator. The discharge current depends on the value of the capacitor, the output voltage and the rate at which Vin drops. In the NCP566 linear regulator, the discharge path is through a large junction and protection diodes are not usually needed. If the regulator is used with large values of output capacitance and the input voltage is instantaneously shorted to ground, damage can occur. In this case, a diode connected as shown in Figure 18 is recommended.
1N4002 (Optional) VIN VIN CIN NCP566 GND VOUT COUT VOUT
Figure 19. Thermal Resistance
Figure 18. Protection Diode for Large Output Capacitors
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NCP566
ORDERING INFORMATION
Device NCP566ST12T3G NCP566ST18T3G NCP566ST25T3G Nominal Output Voltage* 1.2 V 1.8 V 2.5 V Package SOT-223 (Pb-Free) SOT-223 (Pb-Free) SOT-223 (Pb-Free) Shipping 4000 / Tape & Reel 4000 / Tape & Reel 4000 / Tape & Reel
*For other fixed output versions, please contact the factory. 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.
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NCP566
PACKAGE DIMENSIONS
SOT-223 (TO-261) CASE 318E-04 ISSUE L
D b1
NOTES: 1. DIMENSIONING AND TOLERANCING PER ANSI Y14.5M, 1982. 2. CONTROLLING DIMENSION: INCH.
4
HE
1
2
3
E
b e1 e q C
A 0.08 (0003) A1
DIM A A1 b b1 c D E e e1 L1 HE
q
MIN 1.50 0.02 0.60 2.90 0.24 6.30 3.30 2.20 0.85 1.50 6.70 0
MILLIMETERS NOM MAX 1.63 1.75 0.06 0.10 0.75 0.89 3.06 3.20 0.29 0.35 6.50 6.70 3.50 3.70 2.30 2.40 0.94 1.05 1.75 2.00 7.00 7.30 10 -
MIN 0.060 0.001 0.024 0.115 0.009 0.249 0.130 0.087 0.033 0.060 0.264 0
INCHES NOM 0.064 0.002 0.030 0.121 0.012 0.256 0.138 0.091 0.037 0.069 0.276 -
MAX 0.068 0.004 0.035 0.126 0.014 0.263 0.145 0.094 0.041 0.078 0.287 10
L1
SOLDERING FOOTPRINT*
3.8 0.15 2.0 0.079
2.3 0.091
2.3 0.091
6.3 0.248
2.0 0.079 1.5 0.059
mm inches
SCALE 6:1
*For additional information on our Pb-Free strategy and soldering details, please download the ON Semiconductor Soldering and Mounting Techniques Reference Manual, SOLDERRM/D. The product described herein (NCP566), may be covered by one or more of the following U.S. patents: 5,920,184; 5,834,926. There may be other patents pending.
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
LITERATURE FULFILLMENT: Literature Distribution Center for ON Semiconductor P.O. Box 5163, Denver, Colorado 80217 USA Phone: 303-675-2175 or 800-344-3860 Toll Free USA/Canada Fax: 303-675-2176 or 800-344-3867 Toll Free USA/Canada Email: orderlit@onsemi.com N. American Technical Support: 800-282-9855 Toll Free USA/Canada Europe, Middle East and Africa Technical Support: Phone: 421 33 790 2910 Japan Customer Focus Center Phone: 81-3-5773-3850 ON Semiconductor Website: www.onsemi.com Order Literature: http://www.onsemi.com/orderlit For additional information, please contact your local Sales Representative
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NCP566/D

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