NCP551 Product Preview 150 mA CMOS Low Iq Low-Dropout Voltage Regulator The NCP551 series of fixed output low dropout linear regulators are designed for handheld communication equipment and portable battery powered applications which require low quiescent. The NCP551 series features an ultra–low quiescent current of 4.0 µA. Each device contains a voltage reference unit, an error amplifier, a PMOS power transistor, resistors for setting output voltage, current limit, and temperature limit protection circuits. The NCP551 has been designed to be used with low cost ceramic capacitors and requires a minimum output capacitor of 0.1 µF. The device is housed in the micro–miniature TSOP–5 surface mount package. Standard voltage versions are 1.5, 1.8, 2.5, 2.7, 2.8, 3.0, 3.3, and 5.0 V. Other voltages are available in 100 mV steps. Features Low Quiescent Current of 4.0 µA Typical Excellent Line and Load Regulation Maximum Operating Voltage of 12 V Low Output Voltage Option High Accuracy Output Voltage of 2.0% Industrial Temperature Range of –40°C to 85°C 5 1 TSOP–5 SN SUFFIX CASE 483 PIN CONNECTIONS AND MARKING DIAGRAM Vin 1 Gnd 2 Enable 3 5 Vout 4 N/C xxxYW • • • • • • http://onsemi.com xxx = Version Y = Year W = Work Week Typical Applications • Battery Powered Instruments • Hand–Held Instruments • Camcorders and Cameras (Top View) ORDERING INFORMATION See detailed ordering and shipping information in the package dimensions section on page 10 of this data sheet. Vin 1 5 Thermal Shutdown Vout Driver w/ Current Limit Enable ON 3 OFF Gnd 2 Figure 1. Representative Block Diagram This document contains information on a product under development. ON Semiconductor reserves the right to change or discontinue this product without notice. Semiconductor Components Industries, LLC, 2001 June, 2001 – Rev. 0 1 Publication Order Number: NCP551/D NCP551 ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ ÁÁÁÁÁ ÁÁÁÁÁÁ ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ ÁÁÁÁÁ ÁÁÁÁÁÁ ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ ÁÁÁÁÁ ÁÁÁÁÁÁ ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ ÁÁÁÁÁ ÁÁÁÁÁÁ ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ ÁÁÁÁÁ ÁÁÁÁÁÁ ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ ÁÁÁÁÁ ÁÁÁÁÁÁ ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ ÁÁÁÁÁ ÁÁÁÁÁÁ ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ ÁÁÁÁÁ ÁÁÁÁÁÁ ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ PIN FUNCTION DESCRIPTION Pin No. Pin Name Description 1 Vin Positive power supply input voltage 2 Gnd Power supply ground 3 Enable 4 N/C No Internal Connection 5 Vout Regulated output voltage This input is used to place the device into low–power standby. When this input is pulled low, the device is disabled. If this function is not used, Enable should be connected to Vin. MAXIMUM RATINGS ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ ÁÁÁÁÁÁ ÁÁÁÁÁÁÁÁ ÁÁÁÁ ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ ÁÁÁÁÁÁ ÁÁÁÁÁÁÁÁ ÁÁÁÁ ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ ÁÁÁÁÁÁ ÁÁÁÁÁÁÁÁ ÁÁÁÁ ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ ÁÁÁÁÁÁ ÁÁÁÁÁÁÁÁ ÁÁÁÁ ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ ÁÁÁÁÁÁ ÁÁÁÁÁÁÁÁ ÁÁÁÁ ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ ÁÁÁÁÁÁ ÁÁÁÁÁÁÁÁ ÁÁÁÁ ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ ÁÁÁÁÁÁ ÁÁÁÁÁÁÁÁ ÁÁÁÁ ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ ÁÁÁÁÁÁ ÁÁÁÁÁÁÁÁ ÁÁÁÁ ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ ÁÁÁÁÁÁ ÁÁÁÁÁÁÁÁ ÁÁÁÁ Rating Symbol Value Unit Input Voltage Vin 0 to 12 V Enable Voltage VEN –0.3 to Vin +0.3 V Output Voltage Vout –0.3 to Vin +0.3 V Power Dissipation and Thermal Characteristics Power Dissipation Thermal Resistance, Junction–to–Ambient PD RθJA Internally Limited 250 W °C/W Operating Junction Temperature TJ +125 °C Operating Ambient Temperature TA –40 to +85 °C Storage Temperature Tstg –55 to +150 °C Tsolder 10 sec Lead Soldering Temperature @ 260°C 1. This device series contains ESD protection and exceeds the following tests: Human Body Model 2000 V per MIL–STD–883, Method 3015 Machine Model Method 200 V 2. Latch up capability (85°C) 100 mA DC with trigger voltage. http://onsemi.com 2 NCP551 ELECTRICAL CHARACTERISTICS (Vin = Vout(nom.) + 1.0 V, VEN = Vin, Cin = 1.0 µF, Cout = 1.0 µF, TJ = 25°C, unless otherwise noted.) Characteristic Symbol Output Voltage (TA = 25°C, Iout = 10 mA) 1.5 V 1.8 V 2.5 V 2.7 V 2.8 V 3.0 V 3.3 V 5.0 V Vout Output Voltage (TA = –40°C to 85°C, Iout = 10 mA) 1.5 V 1.8 V 2.5 V 2.7 V 2.8 V 3.0 V 3.3 V 5.0 V Vout Min Typ Max 1.455 1.746 2.425 2.646 2.744 2.94 3.234 4.90 1.5 1.8 2.5 2.7 2.8 3.0 3.3 5.0 1.545 1.854 2.575 2.754 2.856 3.06 3.366 5.10 1.440 1.728 2.400 2.619 2.716 2.910 3.201 4.850 1.5 1.8 2.5 2.7 2.8 3.0 3.3 5.0 1.560 1.872 2.600 2.781 2.884 3.09 3.399 5.150 Unit V V Line Regulation (Vin = Vout + 1.0 V to 12 V, Iout = 10 mA) Regline – 10 30 mV Load Regulation (Iout = 10 mA to 150 mA) Regload – 40 65 mV Output Current 1.5 V, 1.8 V (Vin = 4.0 V) 2.5 V, 2.7 V, 2.8 V, 3.0 V (Vin = 5.0 V) 3.3 V (Vin = 6.0 V) 5.0 V (Vin = 8.0 V) Io(nom.) 150 150 150 150 – – – – – – – – Dropout Voltage (Iout = 10 mA, Measured at Vout –3.0%) 1.5 V, 1.8 V, 2.5 V 2.7 V, 2.8 V, 3.0 V, 3.3 V, 5.0 V Vin–Vout – – 130 40 220 150 – – 0.1 4.0 1.0 8.0 – 100 – 1.3 – – – – 0.3 160 160 160 160 350 350 350 350 600 600 600 600 Quiescent Current (Enable Input = 0 V) (Enable Input = Vin, Iout = 1.0 mA to Io(nom.)) IQ Output Voltage Temperature Coefficient Tc Enable Input Threshold Voltage (Voltage Increasing, Output Turns On, Logic High) (Voltage Decreasing, Output Turns Off, Logic Low) mA mV µA V Vth(en) Output Short Circuit Current 1.5 V, 1.8 V (Vin = 4.0 V) 2.5 V, 2.7 V, 2.8 V, 3.0 V (Vin = 5.0 V) 3.3 V (Vin = 6.0 V) 5.0 V (Vin = 8.0 V) mA Iout(max) 3. Maximum package power dissipation limits must be observed. TJ(max) TA PD RJA 4. Low duty cycle pulse techniques are used during testing to maintain the junction temperature as close to ambient as possible. http://onsemi.com 3 ppm/°C NCP551 DEFINITIONS Load Regulation Line Regulation The change in output voltage for a change in output current at a constant temperature. The change in output voltage for a change in input voltage. The measurement is made under conditions of low dissipation or by using pulse technique such that the average chip temperature is not significantly affected. Dropout Voltage The input/output differential at which the regulator output no longer maintains regulation against further reductions in input voltage. Measured when the output drops 3% below its nominal. The junction temperature, load current, and minimum input supply requirements affect the dropout level. Line Transient Response Typical over and undershoot response when input voltage is excited with a given slope. Thermal Protection Internal thermal shutdown circuitry is provided to protect the integrated circuit in the event that the maximum junction temperature is exceeded. When activated at typically 160°C, the regulator turns off. This feature is provided to prevent failures from accidental overheating. Maximum Power Dissipation The maximum total dissipation for which the regulator will operate within its specifications. Quiescent Current The quiescent current is the current which flows through the ground when the LDO operates without a load on its output: internal IC operation, bias, etc. When the LDO becomes loaded, this term is called the Ground current. It is actually the difference between the input current (measured through the LDO input pin) and the output current. Maximum Package Power Dissipation The maximum power package dissipation is the power dissipation level at which the junction temperature reaches its maximum operating value, i.e. 125°C. Depending on the ambient power dissipation and thus the maximum available output current. http://onsemi.com 4 Iout, OUTPUT CURRENT (mA) Iout = 3.0 mA – 150 mA 150 Vout = 2.8 V Cout = 10 µA 0 OUTPUT VOLTAGE DEVIATION (mV) OUTPUT VOLTAGE DEVIATION (mV) Iout, OUTPUT CURRENT (mA) NCP551 0 –500 –1000 0 1 2 3 4 5 6 7 8 9 Iout = 3.0 mA – 150 mA Vout = 2.8 V Cout = 10 µA 150 0 1000 500 0 –500 0 1 2 3 4 TIME (ms) Iout, OUTPUT CURRENT (mA) Iout = 3.0 mA – 150 mA Vout = 3.3 V Cout = 10 µA 0 1000 500 0 –500 0 1 2 3 4 5 6 7 8 9 9 –500 –1000 0 1 2 3 4 5 6 7 8 9 TIME (ms) Figure 5. Load Transient Response ON Vin, INPUT VOLTAGE (V) 8 6 4 Vin = 3.8 V to 4.8 V Vout = 2.8 V Cout = 1 F Iout = 10 mA OUTPUT VOLTAGE DEVIATION (mV) VOLTAGE (V) DEVIATION (mV) 8 0 Figure 4. Load Transient Response OFF 200 7 Iout = 3.0 mA – 150 mA Vout = 3.3 V Cout = 10 µA 150 TIME (ms) 400 6 Figure 3. Load Transient Response OFF OUTPUT VOLTAGE DEVIATION (mV) OUTPUT VOLTAGE DEVIATION (mV) Iout, OUTPUT CURRENT (mA) Figure 2. Load Transient Response ON 150 5 TIME (ms) 6 4 Vin = 3.8 V to 4.8 V Vout = 2.8 V Cout = 1 F Iout = 100 mA 400 200 0 –200 0 –400 –200 –600 –400 0 200 400 600 800 1000 1200 1400 1600 0 200 400 600 800 1000 1200 1400 TIME (s) TIME (s) Figure 6. Line Transient Response Figure 7. Line Transient Response http://onsemi.com 5 1600 4 Vin = 3.8 V to 4.8 V Vout = 2.8 V Cout = 1 F Iout = 150 mA 400 200 0 –200 Vin, INPUT VOLTAGE (V) 6 –400 200 0 –600 200 400 600 800 1000 1200 1400 0 1600 400 600 800 1000 1200 1400 1600 Figure 8. Line Transient Response Figure 9. Line Transient Response Vin = 4.3 V to 5.3 V Vout = 3.3 V Cout = 1 F Iout = 100 mA 600 400 200 0 –200 OUTPUT VOLTAGE DEVIATION (mV) 800 Vin, INPUT VOLTAGE (V) TIME (s) 4 6 4 Vin = 4.3 V to 5.3 V Vout = 3.3 V Cout = 1 F Iout = 150 mA 600 400 200 0 –200 –400 –400 –600 –600 100 300 500 700 900 1100 1300 1500 1700 1900 0 400 800 1200 1600 TIME (s) TIME (s) Figure 10. Line Transient Response Figure 11. Line Transient Response 2000 3 ENABLE VOLTAGE (V) 3 2 1 0 3 Vin = 4.3 V Vout = 3.3 V RO = 3.3 K VEN = 2.0 V 2 1 Vout, OUTPUT VOLTAGE (V) ENABLE VOLTAGE (V) 200 TIME (s) 6 Vout, OUTPUT VOLTAGE (V) Vin = 4.3 V to 5.3 V Vout = 3.3 V Cout = 1 F Iout = 10 mA –400 0 Vin, INPUT VOLTAGE (V) 4 –200 –600 OUTPUT VOLTAGE DEVIATION (mV) 6 400 OUTPUT VOLTAGE DEVIATION (mV) OUTPUT VOLTAGE DEVIATION (mV) Vin, INPUT VOLTAGE (V) NCP551 Co = 1 F Co = 10 F 0 0 200 400 600 800 1000 1200 1400 1600 1800 2000 2 1 0 3 Vin = 3.8 V Vout = 2.8 V RO = 2.8 K VEN = 2.0 V 2 1 Co = 1 F Co = 10 F 0 0 TIME (s) 200 400 600 800 1000 1200 1400 1600 1800 2000 TIME (s) Figure 12. Turn–On Response Figure 13. Turn–On Response http://onsemi.com 6 NCP551 3.35 3.45 Vout = 3.3 V 3.3 GROUND CURRENT (A) GROUND CURRENT (A) Vout = 2.8 V 3.25 3.2 3.15 3.1 3.05 25 50 100 75 125 3.3 3.25 3.2 150 0 25 50 75 100 125 Iout, OUTPUT CURRENT (mA) Iout, OUTPUT CURRENT (mA) Figure 14. Ground Pin Current versus Output Current Figure 15. Ground Pin Current versus Output Current 3 150 3.5 Vout, OUTPUT VOLTAGE (VOLTS) Vout, OUTPUT VOLTAGE (VOLTS) 3.35 3.15 0 2.5 2 Vin = 0 V to 12 V Vout(nom) = 2.8 V Iout = 10 mA Cin = 1 F Cout = 1 F VEN = Vin 1.5 1 0.5 0 3 2.5 Vin = 0 V to 12 V Vout = 3.3 V Iout = 10 mA Cin = 1 F Cout = 1 F VEN = Vin 2 1.5 1 0.5 0 0 2 4 8 6 10 12 0 2 4 8 6 10 12 Vin, INPUT VOLTAGE (VOLTS) Vin, INPUT VOLTAGE (VOLTS) Figure 16. Output Voltage versus Input Voltage Figure 17. Output Voltage versus Input Voltage 4 4 3.5 3.5 GROUND PIN CURRENT (A) GROUND PIN CURRENT (A) 3.4 3 2.5 2 1.5 Vout(nom) = 2.8 V Iout = 25 mA 1 0.5 3 2.5 2 1.5 Vout(nom) = 3.3 V Iout = 25 mA 1 0.5 0 0 0 2 4 6 8 10 12 0 14 2 4 6 8 10 12 Vin, INPUT VOLTAGE (VOLTS) Vin, INPUT VOLTAGE (VOLTS) Figure 18. Ground Pin Current versus Input Voltage Figure 19. Ground Pin Current versus Input Voltage http://onsemi.com 7 14 NCP551 APPLICATIONS INFORMATION Thermal A typical application circuit for the NCP551 series is shown in Figure 20. As power across the NCP551 increases, it might become necessary to provide some thermal relief. The maximum power dissipation supported by the device is dependent upon board design and layout. Mounting pad configuration on the PCB, the board material, and also the ambient temperature effect the rate of temperature rise for the part. This is stating that when the NCP551 has good thermal conductivity through the PCB, the junction temperature will be relatively low with high power dissipation applications. The maximum dissipation the package can handle is given by: Input Decoupling (C1) A 0.1 µF capacitor either ceramic or tantalum is recommended and should be connected close to the NCP551 package. Higher values and lower ESR will improve the overall line transient response. Output Decoupling (C2) The NCP551 is a stable Regulator and does not require any specific Equivalent Series Resistance (ESR) or a minimum output current. Capacitors exhibiting ESRs ranging from a few mΩ up to 3.0 Ω can thus safely be used. The minimum decoupling value is 0.1 µF and can be augmented to fulfill stringent load transient requirements. The regulator accepts ceramic chip capacitors as well as tantalum devices. Larger values improve noise rejection and load regulation transient response. PD If junction temperature is not allowed above the maximum 125°C, then the NCP551 can dissipate up to 400 mW @ 25°C. The power dissipated by the NCP551 can be calculated from the following equation: Enable Operation Ptot [Vin * Ignd (Iout)] [Vin Vout] * Iout The enable pin will turn on or off the regulator. These limits of threshold are covered in the electrical specification section of this data sheet. If the enable is not used then the pin should be connected to Vin. or P Vout * Iout VinMAX tot Ignd Iout Hints If a 150 mA output current is needed then the ground current from the data sheet is 4.0 µA. For an NCP551SN30T1 (3.0 V), the maximum input voltage will then be 5.6 V. Please be sure the Vin and Gnd lines are sufficiently wide. When the impedance of these lines is high, there is a chance to pick up noise or cause the regulator to malfunction. Set external components, especially the output capacitor, as close as possible to the circuit, and make leads as short as possible. Battery or Unregulated Voltage TJ(max) TA RJA Vout + + C1 ON OFF Figure 20. Typical Application Circuit http://onsemi.com 8 C2 NCP551 Input R1 Input Q1 Q1 R2 R Output 1 1.0 µF R3 5 Output 1 1.0 µF 2 3 Q2 1.0 µF 4 5 1.0 µF 2 3 Figure 21. Current Boost Regulator 4 Figure 22. Current Boost Regulator with Short Circuit Limit The NCP551 series can be current boosted with a PNP transistor. Resistor R in conjunction with VBE of the PNP determines when the pass transistor begins conducting; this circuit is not short circuit proof. Input/Output differential voltage minimum is increased by VBE of the pass resistor. Short circuit current limit is essentially set by the VBE of Q2 and R1. ISC = ((VBEQ2 – ib * R2) / R1) + IO(max) Regulator Output Input 1 5 1.0 µF 1.0 µF 2 Enable 3 Input 4 R Output 1 1.0 µF 1.0 µF 5 1.0 µF 2 3 4 11 V 2 3 1 5 1.0 µF R Output Q1 4 C Figure 24. Input Voltages Greater than 12 V Figure 23. Delayed Turn–on A regulated output can be achieved with input voltages that exceed the 12 V maximum rating of the NCP551 series with the addition of a simple pre–regulator circuit. Care must be taken to prevent Q1 from overheating when the regulated output (Vout) is shorted to Gnd. If a delayed turn–on is needed during power up of several voltages then the above schematic can be used. Resistor R, and capacitor C, will delay the turn–on of the bottom regulator. http://onsemi.com 9 NCP551 MINIMUM RECOMMENDED FOOTPRINT FOR SURFACE MOUNTED APPLICATIONS Surface mount board layout is a critical portion of the total design. The footprint for the semiconductor packages must be the correct size to insure proper solder connection interface between the board and the package. With the correct pad geometry, the packages will self align when subjected to a solder reflow process. 0.094 2.4 0.037 0.95 0.074 1.9 0.037 0.95 0.028 0.7 0.039 1.0 inches mm TSOP–5 (Footprint Compatible with SOT23–5) ORDERING INFORMATION Device NCP551SN15T1 NCP551SN18T1 NCP551SN25T1 NCP551SN27T1 NCP551SN28T1 NCP551SN30T1 NCP551SN33T1 NCP551SN50T1 Nominal Output Voltage Marking Package Shipping 1.5 1.8 2.5 2.7 2.8 3.0 3.3 5.0 LAO LAP LAQ LAR LAS LAT LAU LAV TSOP–5 3000 Units/7″ Tape & Reel Additional voltages in 100 mV steps are available upon request by contacting your ON Semiconductor representative. http://onsemi.com 10 NCP551 PACKAGE DIMENSIONS TSOP–5 SN SUFFIX PLASTIC PACKAGE CASE 483–01 ISSUE A NOTES: 1. DIMENSIONING AND TOLERANCING PER ANSI Y14.5M, 1982. 2. CONTROLLING DIMENSION: MILLIMETER. 3. MAXIMUM LEAD THICKNESS INCLUDES LEAD FINISH THICKNESS. MINIMUM LEAD THICKNESS IS THE MINIMUM THICKNESS OF BASE MATERIAL. D S 5 4 1 2 3 B L G A J C 0.05 (0.002) H M K http://onsemi.com 11 DIM A B C D G H J K L M S MILLIMETERS MIN MAX 2.90 3.10 1.30 1.70 0.90 1.10 0.25 0.50 0.85 1.00 0.013 0.100 0.10 0.26 0.20 0.60 1.25 1.55 0 10 2.50 3.00 INCHES MIN MAX 0.1142 0.1220 0.0512 0.0669 0.0354 0.0433 0.0098 0.0197 0.0335 0.0413 0.0005 0.0040 0.0040 0.0102 0.0079 0.0236 0.0493 0.0610 0 10 0.0985 0.1181 NCP551 ON Semiconductor and are 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. 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: [email protected] JAPAN: ON Semiconductor, Japan Customer Focus Center 4–32–1 Nishi–Gotanda, Shinagawa–ku, Tokyo, Japan 141–0031 Phone: 81–3–5740–2700 Email: [email protected] ON Semiconductor Website: http://onsemi.com For additional information, please contact your local Sales Representative. N. American Technical Support: 800–282–9855 Toll Free USA/Canada http://onsemi.com 12 NCP551/D