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. http://onsemi.com MARKING DIAGRAMS Features • • • • • • • • 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 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 Typical Applications • • • • • • • • • • • • • (Note: Microdot may be in either location) Servers ASIC Power Supplies Post Regulation for Power Supplies Constant Current Source DTV LCD Monitors Networking Equipment Battery Powered Systems Motherboards Peripheral Cards Set Top Boxes Medical Equipment Notebook Computers © Semiconductor Components Industries, LLC, 2007 March, 2007 − Rev. 1 AYM 566xx G G SOT−223 CASE 318E PIN CONNECTIONS Vin 1 GND 2 Vout 3 GND ORDERING INFORMATION See detailed ordering and shipping information in the package dimensions section on page 9 of this data sheet. 1 Publication Order Number: NCP566/D NCP566 PIN DESCRIPTION ÁÁÁÁÁÁÁÁÁ ÁÁÁÁÁÁÁÁÁ ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ ÁÁÁÁÁÁÁÁÁ ÁÁÁÁÁÁÁÁÁ ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ ÁÁÁÁÁÁÁÁÁ ÁÁÁÁÁÁÁÁÁ ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ ÁÁÁÁÁÁÁÁÁ ÁÁÁÁÁÁÁÁÁ ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ Pin No. Symbol 1 Vin 2, Tab Ground 3 Vout Description Positive Power Supply Input Voltage Power Supply Ground Regulated Output Voltage MAXIMUM RATINGS Rating Symbol Value Unit Input Voltage (Note 1) Vin 9.0 V Output Pin Voltage Vout −0.3 to Vin + 0.3 V Thermal Characteristics (Notes 2, 3) Thermal Resistance, Junction−to−Ambient Thermal Resistance, Junction−to−Pin RqJA RqJP 107 12 Operating Junction Temperature Range TJ −40 to 150 °C Operating Ambient Temperature Range TA −40 to 125 °C Storage Temperature Range Tstg −55 to 150 °C °C/W 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 Voltage Vref = 0.9 V Reference Output Block Stage Vout R1 R2 GND GND Cin − 4.7 mF to 150 mF recommended Cout − 2.2 mF to 150 mF recommended See more details in Applications Information section Figure 1. Typical Schematic http://onsemi.com 2 Cout NCP566 ELECTRICAL CHARACTERISTICS (Vin = Vout + 1.6 V, for typical values TJ = 25°C, for min/max values TJ = −40°C to +125°C, (Note 4) unless otherwise noted.) Characteristic Symbol Min Typ Max Unit Output Voltage (10 mA < Iout < 1.5 A; 2.8 V < Vin < 9.0 V; TJ = −10 to 105°C) 1.2 V version Vout 1.176 (−2%) 1.2 1.224 (+2%) V Output Voltage (10 mA < Iout < 1.5 A; 2.8 V < Vin < 9.0 V; TJ = −40 to 125°C) 1.2 V version Vout 1.164 (−3%) 1.2 1.236 (+3%) V Output Voltage (10 mA < Iout < 1.5 A; 3.4 V < Vin < 9.0 V; TJ = −10 to 105°C) 1.8 V version Vout 1.764 (−2%) 1.8 1.836 (+2%) V Output Voltage (10 mA < Iout < 1.5 A; 3.4 V < Vin < 9.0 V; TJ = −40 to 125°C) 1.8 V version Vout 1.746 (−3%) 1.8 1.854 (+3%) V Output Voltage (10 mA < Iout < 1.5 A; 4.1 V < Vin < 9.0 V; TJ = −10 to 105°C) 2.5 V version Vout 2.450 (−2%) 2.5 2.550 (+2%) V Output Voltage (10 mA < Iout < 1.5 A; 4.1 V < Vin < 9.0 V; TJ = −40 to 125°C) 2.5 V version Vout 2.425 (−3%) 2.5 2.575 (+3%) V Line Regulation (Iout = 10 mA) Regline − 0.02 − % Load Regulation (10 mA < Iout < 1.5 A) Regload − 0.04 − % Dropout Voltage (Iout = 1.5 A) (Note 5) Vdo − 0.9 1.3 V Current Limit Ilim 1.6 3.5 − A Ripple Rejection (120 Hz; Iout = 1.5 A) RR − 85 − dB Ripple Rejection (1 kHz; Iout = 1.5 A) RR − 75 − dB − 160 − °C Ground Current (Iout = 1.5 A) Iq − 1.5 3.0 mA Output Noise Voltage (f = 100 Hz to 100 kHz, Iout = 1.5 A) Vn − 37 − mVrms Thermal Shutdown 4. Refer to Application Information section for capacitor details. 5. Dropout voltage is a measurement of the minimum input/output differential at full load. http://onsemi.com 3 NCP566 TYPICAL CHARACTERISTICS 1.820 VOUT, OUTPUT VOLTAGE (V) VOUT, OUTPUT VOLTAGE (V) 2.53 2.52 2.51 2.50 2.49 Vout = 2.5 V Iout = 10 mA 2.48 2.47 −50 −25 0 25 50 100 75 125 1.815 1.810 1.805 1.800 1.795 1.790 Vout = 1.8 V Iout = 10 mA 1.785 1.780 −50 150 −25 TJ, JUNCTION TEMPERATURE (°C) 1.205 1.200 1.195 1.190 Vout = 1.2 V Iout = 10 mA 0 50 25 75 100 125 150 ISC, SHORT CIRCUIT CURRENT LIMIT (A) 1.210 125 150 3.70 3.65 3.60 3.55 3.50 −50 −25 0 25 50 75 100 125 TJ, JUNCTION TEMPERATURE (°C) Figure 5. Short Circuit Current Limit vs. Temperature 1.2 1.0 Iout = 1.5 A 0.8 0.6 Iout = 50 mA 0.4 0.2 −25 100 3.75 Figure 4. Output Voltage vs. Temperature 0 −50 75 3.80 TJ, JUNCTION TEMPERATURE (°C) Vin − Vout, DROPOUT VOLTAGE (V) VOUT, OUTPUT VOLTAGE (V) 1.215 −25 50 Figure 3. Output Voltage vs. Temperature 1.220 1.180 −50 25 TJ, JUNCTION TEMPERATURE (°C) Figure 2. Output Voltage vs. Temperature 1.185 0 0 25 50 75 100 125 TJ, JUNCTION TEMPERATURE (°C) Figure 6. Dropout Voltage vs. Temperature http://onsemi.com 4 150 150 NCP566 TYPICAL CHARACTERISTICS 1.80 IGND, GROUND CURRENT (mA) IGND, GROUND CURRENT (mA) 1.70 1.65 1.60 1.55 1.50 1.45 Iout = 1.5 A 1.40 −50 1.75 1.70 1.65 1.60 1.55 −25 0 50 100 25 75 125 TJ, JUNCTION TEMPERATURE (°C) 0 150 Figure 7. Ground Current vs. Temperature 300 600 900 1200 Iout, OUTPUT CURRENT (mA) Figure 8. Ground Current vs. Output Current 1000 100 Vout = 2.5 V 90 Unstable 100 80 Cout = 10 mF Cout = 2.2 mF 70 60 ESR (W) RIPPLE REJECTION (dB) 1500 50 40 10 1 Cout = 150 mF Iout = 1.5 A 30 Stable 0.1 20 10 0 10 0.01 100 1000 10000 F, FREQUENCY (Hz) 100000 1000000 0 250 500 750 1000 1250 1500 OUTPUT CURRENT (mA) 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 http://onsemi.com 5 NCP566 TYPICAL CHARACTERISTICS Vout = 1.2 V Vout = 1.2 V Figure 14. Load Transient from 1.5 A to 10 mA 140 140 120 120 NOISE DENSITY (nV/√Hz) NOISE DENSITY (nV/√Hz) Figure 13. Load Transient from 1.5 A to 10 mA 100 80 60 40 Vout = 1.2 V Iout = 10 mA 20 0 100 80 60 40 Vout = 1.2 V Iout = 1.5 A 20 0 0 10 20 30 40 50 60 70 80 90 100 0 f, FREQUENCY (kHz) 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 http://onsemi.com 6 NCP566 150 mF should cover most of the applications. The higher capacitance the better load transient response. When a high value capacitor is used, a low value capacitor is also recommended to be put in parallel. The NCP566 is optimized 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 load 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. 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 Typical values of parameters in Electrical Characteristics section and in Typical Characteristics section were measured with input and output capacitors equal to 150 mF unless otherwise noted. 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. The range of 4.7 mF to 150 mF should cover most of the applications. The higher capacitance the lower change of input voltage due to line and load transients. 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 range of 2.2 mF to Load Transient Measurement 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. GEN Vout −VCC Vin Pulse V NCP566 RL Evaluation Board GND + + GND Scope Voltage Probe Figure 17. Schematic for Transient Response Measurement http://onsemi.com 7 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. 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 + TJ(max) * TA RqJA 200 Protection Diodes 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. 180 qJA (°C/W) 160 140 120 100 1 oz Cu 80 60 2 oz Cu 40 0 50 100 150 200 250 300 350 400 450 500 COPPER HEAT−SPREADER AREA (mm sq) Figure 19. Thermal Resistance 1N4002 (Optional) VIN VOUT VIN CIN VOUT NCP566 COUT GND Figure 18. Protection Diode for Large Output Capacitors http://onsemi.com 8 NCP566 ORDERING INFORMATION Device NCP566ST12T3G NCP566ST18T3G NCP566ST25T3G Nominal Output Voltage* Package Shipping † 1.2 V SOT−223 (Pb−Free) 4000 / Tape & Reel 1.8 V SOT−223 (Pb−Free) 4000 / Tape & Reel 2.5 V SOT−223 (Pb−Free) 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. http://onsemi.com 9 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 E 3 b e1 e 0.08 (0003) C q A DIM A A1 b b1 c D E e e1 L1 HE q A1 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 SCALE 6:1 mm Ǔ ǒinches *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. 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