NCP3335A Ultra High Accuracy, Low Iq, 500 mA Low Dropout Regulator The NCP3335A is a high performance, low dropout regulator. With accuracy of ±0.9% over line and load and ultra−low quiescent current and noise it encompasses all of the necessary features required by today’s consumer electronics. This unique device is guaranteed to be stable without a minimum load current requirement and stable with any type of capacitor as small as 1.0 mF. The NCP3335A also comes equipped with sense and noise reduction pins to increase the overall utility of the device. The NCP3335A offers reverse bias protection. http://onsemi.com Micro8t DM SUFFIX CASE 846A DFN10 MN SUFFIX CASE 485C Features • • • • • • • • • • • • • High Accuracy Over Line and Load (+0.9% at 255C) Ultra−Low Dropout Voltage at Full Load (260 mV typ.) No Minimum Output Current Required for Stability Low Noise (35 mVrms w/10 nF Cnr and 56 mVrms w/out Cnr) Low Shutdown Current (0.07 mA) Reverse Bias Protected 2.6 V to 12 V Supply Range Thermal Shutdown Protection Current Limitation Requires Only 1.0 mF Output Capacitance for Stability Stable with Any Type of Capacitor (including MLCC) Available in 2.5 V, 2.85 V, 3.3 V, 5.0 V and Adjustable Output Voltages These are Pb−Free Devices Applications • • • • • • • • PCMCIA Card Cellular Phones Camcoders and Cameras Networking Systems, DSL/Cable Modems Cable Set−Top Box MP3/CD Players DSP Supply Displays and Monitors MARKING DIAGRAM 8 xxx AYWG G 1 1 3335A xxx ALYWG G Fixed Version Pin 1, 2. Vout 3. Sense 4. GND 5. NR 6. SD 7, 8. Vin Adj Version Pin 1, 2. Vout 3. Adj 4. GND 5. NR 6. SD 7, 8. Vin Fixed Version Pin 1, 2. Vout 3. Sense 4. GND 5, 6. NC 7. NR 8. SD 9, 10. Vin Adj Version Pin 1, 2. Vout 3. Adj 4. GND 5, 6. NC 7. NR 8. SD 9, 10. Vin Micro8 DFN10 xxx = LIQ for 2.5 V xxx = 25 for 2.5 V = LIR for 2.85 V = 285 for 2.85 V = LIS for 3.3 V = 33 for 3.3 V = LIT for 5.0 V = 50 for 5.0 V = LIO for Adj. = ADJ for Adj. A = Assembly Location L = Wafer Lot Y = Year W = Work Week G = Pb−Free Package (Note: Microdot may be in either location) ORDERING INFORMATION See detailed ordering and shipping information in the package dimensions section on page 13 of this data sheet. © Semiconductor Components Industries, LLC, 2006 April, 2006 − Rev. 3 1 Publication Order Number: NCP3335A/D NCP3335A Cnr (Optional) 5 NR SENSE 7 IN OUT IN OUT 2 8 Vin Vout 1 + Cin 1.0 mF 3 Cout 1.0 mF GND SD 6 + 4 ON OFF Figure 1. Typical Fixed Version Application Schematic (Micro8 Package) Cnr 10 nF (Optional) 5 NR OUT 7 OUT IN 8 Vin ADJ IN 2 1 3 R1 + Cin 1.0 mF SD 6 CADJ 68 pF Vout Cout 1.0 mF + R2 GND 4 ON OFF Figure 2. Typical Adjustable Version Application Schematic (Micro8 Package) http://onsemi.com 2 NCP3335A PIN FUNCTION DESCRIPTION Fixed Version Micro8 Pin No. DFN10 Pin No. Pin Name 1, 2 1, 2 Vout 3 3 SENSE 4 4 GND 5 7 NR Noise Reduction Pin. This is an optional pin used to further reduce noise. Description Regulated output voltage. Bypass to ground with Cout w 1.0 mF. For output voltage sensing, connect to Pins 1 and 2. Power Supply Ground 6 8 SD Shutdown pin. When not in use, this pin should be connected to the input pin. 7, 8 9, 10 Vin Power Supply Input Voltage − 5, 6 NC Not Connected − EPAD EPAD Exposed thermal pad should be connected to ground. Adjustable Version Vout Regulated output voltage. Bypass to ground with Cout w 1.0 mF. 3 Adj Adjustable pin; reference voltage = 1.25 V. 4 GND 5 7 NR Noise Reduction Pin. This is an optional pin used to further reduce noise. 6 8 SD Shutdown pin. When not in use, this pin should be connected to the input pin. 7, 8 9, 10 Vin Power Supply Input Voltage − 5, 6 NC Not Connected − EPAD EPAD 1, 2 1, 2 3 4 Power Supply Ground Exposed thermal pad should be connected to ground. MAXIMUM RATINGS Rating Symbol Value Unit Input Voltage Vin −0.3 to +16 V Output Voltage Vout −0.3 to Vin +0.3 or 10 V* V Shutdown Pin Voltage Vsh −0.3 to +16 V RqJA 238 °C/W Operating Junction Temperature Range, Micro8 TJ −40 to +150 °C Storage Temperature Range Tstg −50 to+150 °C Thermal Characteristics Thermal Resistance, Junction−to−Air Maximum ratings are those values beyond which device damage can occur. Maximum ratings applied to the device are individual stress limit values (not normal operating conditions) and are not valid simultaneously. If these limits are exceeded, device functional operation is not implied, damage may occur and reliability may be affected. NOTE: This device series contains ESD protection and exceeds the following tests: Human Body Model (HBM) JESD 22−A114−B Machine Model (MM) JESD 22−A115−A *Which ever is less. Reverse bias protection feature valid only if Vout − Vin ≤ 7 V. THERMAL CHARACTERISTICS Test Conditions (Typical Value) Min Pad Board (Note 1) 1, Pad Board (Note 1) Unit Junction−to−Air, qJA 264 174 °C/W Junction−to−Pin, yJL2 110 100 °C/W Junction−to−Air, qJA 215 66 °C/W Junction−to−Pin, yJL2 55 17 °C/W Characteristic Micro 8 10 Lead DFN EPad 1. As mounted on a 35 x 35 x 1.5 mm FR4 Substrate, with a single layer of a specified copper area of 2 oz (0.07 mm thick) copper traces and heat spreading area. JEDEC 51 specifications for a low and high conductivity test board recommend a 2 oz copper thickness. Test conditions are under natural convection or zero air flow. http://onsemi.com 3 NCP3335A ELECTRICAL CHARACTERISTICS − 2.5 V (Vout = 2.5 V typical, Vin = 2.9 V, TA = −40°C to +85°C, unless otherwise noted) Symbol Min Typ Max Unit Output Voltage (Accuracy) Vin = 2.9 V to 6.5 V, Iload = 0.1 mA to 500 mA, TJ = 25°C Characteristic Vout −0.9% 2.477 2.5 +0.9% 2.523 V Output Voltage (Accuracy) Vin = 2.9 V to 6.5 V, Iload = 0.1 mA to 500 mA, TJ = 0°C to +85°C Vout −1.4% 2.465 2.5 +1.4% 2.535 V Output Voltage (Accuracy), (Note 2) Vin = 2.9 V to 6.5 V, Iload = 0.1 mA to 500 mA, TJ = −40°C to +150°C Vout −1.5% 2.462 2.5 +1.5% 2.538 V Line Regulation Vin = 2.9 V to 12 V, Iload = 0.1 mA LineReg 0.04 mV/V Load Regulation Vin = 2.9 V, Iload = 0.1 mA to 500 mA LoadReg 0.04 mV/mA Dropout Voltage (See App Note) Iload = 500 mA (Note 3) Iload = 300 mA (Note 3) Iload = 50 mA Iload = 0.1mA VDO mV 340 230 110 10 Peak Output Current (See Figure 7) Ipk Short Output Current (See Figure 7) Isc Thermal Shutdown TJ Ground Current In Regulation Iload = 500 mA (Note 3) Iload = 300 mA (Note 3) Iload = 50 mA Iload = 0.1 mA 500 700 800 mA 900 mA °C 160 IGND 9.0 4.6 0.8 − In Dropout Vin = 2.4 V, Iload = 0.1 mA In Shutdown SD = 0 V IGNDsh Output Noise Cnr = 0 nF, Iload = 500 mA, f = 10 Hz to 100 kHz, Cout = 10 mF Cnr = 10 nF, Iload = 500 mA, f = 10 Hz to 100 kHz, Cout = 10 mF 0.07 14 7.5 2.5 190 mA 500 mA 1.0 mA Vnoise mVrms mVrms 56 35 Shutdown Threshold Voltage ON Threshold Voltage OFF mA 2.0 0.4 V V ISD 0.07 1.0 mA Output Current In Shutdown Mode, Vout = 0 V IOSD 0.07 1.0 mA Reverse Bias Protection, Current Flowing from the Output Pin to GND (Vin = 0 V, Vout_forced = 2.5 V) IOUTR 10 SD Input Current, VSD = 0 V to 0.4 V or VSD = 2.0 V to Vin 2. For output current capability for TJ < 0°C, please refer to Figure 9. 3. TA must be greater than 0°C. http://onsemi.com 4 mA NCP3335A ELECTRICAL CHARACTERISTICS − 2.85 V (Vout = 2.85 V typical, Vin = 3.25 V, TA = −40°C to +85°C, unless otherwise noted) Symbol Min Typ Max Unit Output Voltage (Accuracy) Vin = 3.25 V to 6.85 V, Iload = 0.1 mA to 500 mA, TJ = 25°C Characteristic Vout −0.9% 2.824 2.85 +0.9% 2.876 V Output Voltage (Accuracy) Vin = 3.25 V to 6.85 V, Iload = 0.1 mA to 500 mA, TJ = 0°C to +85°C Vout −1.4% 2.810 2.85 +1.4% 2.890 V Output Voltage (Accuracy) (Note 4) Vin = 3.25 V to 6.85 V, Iload = 0.1 mA to 500 mA, TJ = −40°C to +150°C Vout −1.5% 2.807 2.85 +1.5% 2.893 V Line Regulation Vin = 3.25 V to 12 V, Iload = 0.1 mA LineReg 0.04 mV/V Load Regulation Vin = 3.25 V, Iload = 0.1 mA to 500 mA LoadReg 0.04 mV/mA Dropout Voltage (See App Note) Iload = 500 mA Iload = 300 mA Iload = 50 mA Iload = 0.1mA VDO mV 340 230 110 10 Peak Output Current (See Figure 7) Ipk Short Output Current (See Figure 7) Isc Thermal Shutdown TJ Ground Current In Regulation Iload = 500 mA (Note 5) Iload = 300 mA Iload = 50 mA Iload = 0.1 mA 500 700 800 mA 900 mA °C 160 IGND In Dropout Vin = 2.75 V, Iload = 0.1 mA In Shutdown SD = 0 V IGNDsh Output Noise Cnr = 0 nF, Iload = 500 mA, f = 10 Hz to 100 kHz, Cout = 10 mF Cnr = 10 nF, Iload = 500 mA, f = 10 Hz to 100 kHz, Cout = 10 mF 9.0 4.6 0.8 − 14 7.5 2.5 190 − 500 mA 0.07 1.0 mA Vnoise mA mVrms mVrms 61 40 Shutdown Threshold Voltage ON Threshold Voltage OFF mA 2.0 0.4 V V ISD 0.07 1.0 mA Output Current In Shutdown Mode, Vout = 0 V IOSD 0.07 1.0 mA Reverse Bias Protection, Current Flowing from the Output Pin to GND (Vin = 0 V, Vout_forced = 2.85 V) IOUTR 10 SD Input Current, VSD = 0 V to 0.4 V or VSD = 2.0 V to Vin 4. For output current capability for TJ < 0°C, please refer to Figure 8. 5. TA must be greater than 0°C. http://onsemi.com 5 mA NCP3335A ELECTRICAL CHARACTERISTICS – 3.3 V (Vout = 3.3 V typical, Vin = 3.7 V, TA = −40°C to +85°C, unless otherwise noted) Symbol Min Typ Max Unit Output Voltage (Accuracy) Vin = 3.7 V to 7.3 V, Iload = 0.1 mA to 500 mA, TJ = 25°C Characteristic Vout −0.9% 3.270 3.3 +0.9% 3.330 V Output Voltage (Accuracy) Vin = 3.7 V to 7.3 V, Iload = 0.1 mA to 500 mA, TJ = 0°C to +85°C Vout −1.4% 3.254 3.3 +1.4% 3.346 V Output Voltage (Accuracy) Vin = 3.7 V to 7.3 V, Iload = 0.1 mA to 500 mA, TJ = −40°C to +150°C Vout −1.5% 3.250 3.3 +1.5% 3.350 V Line Regulation Vin = 3.7 V to 12 V, Iload = 0.1 mA LineReg 0.04 mV/V Load Regulation Vin = 3.7 V, Iload = 0.1 mA to 500 mA LoadReg 0.04 mV/mA Dropout Voltage (See App Note) Iload = 500 mA Iload = 300 mA Iload = 50 mA Iload = 0.1 mA VDO Peak Output Current (See Figure 7) Ipk Short Output Current (See Figure 7) Isc Thermal Shutdown TJ mV 340 230 110 10 Ground Current In Regulation Iload = 500 mA (Note 6) Iload = 300 mA Iload = 50 mA Iload = 0.1 mA 500 700 800 mA 900 mA °C 160 IGND In Dropout Vin = 3.2 V, Iload = 0.1 mA In Shutdown SD = 0 V IGNDsh Output Noise Cnr = 0 nF, Iload = 500 mA, f = 10 Hz to 100 kHz, Cout = 10 mF Cnr = 10 nF, Iload = 500 mA, f = 10 Hz to 100 kHz, Cout = 10 mF 9.0 4.6 0.8 − 14 7.5 2.5 190 mA − 500 mA 0.07 1.0 mA Vnoise mVrms mVrms 69 46 Shutdown Threshold Voltage ON Threshold Voltage OFF mA 2.0 0.4 V V ISD 0.07 1.0 mA Output Current In Shutdown Mode, Vout = 0 V IOSD 0.07 1.0 mA Reverse Bias Protection, Current Flowing from the Output Pin to GND (Vin = 0 V, Vout_forced = 3.3 V) IOUTR 10 SD Input Current, VSD = 0 V to 0.4 V or VSD = 2.0 V to Vin 6. TA must be greater than 0°C. http://onsemi.com 6 mA NCP3335A ELECTRICAL CHARACTERISTICS – 5.0 V (Vout = 5.0 V typical, Vin = 5.4 V, TA = −40°C to +85°C, unless otherwise noted) Symbol Min Typ Max Unit Output Voltage (Accuracy) Vin = 5.4 V to 9.0 V, Iload = 0.1 mA to 500 mA, TJ = 25°C Characteristic Vout −0.9% 4.955 5.0 +0.9% 5.045 V Output Voltage (Accuracy) Vin = 5.4 V to 9.0 V, Iload = 0.1 mA to 500 mA, TJ = 0°C to +85°C Vout −1.4% 4.930 5.0 +1.4% 5.070 V Output Voltage (Accuracy) Vin = 5.4 V to 9.0 V, Iload = 0.1 mA to 500 mA, TJ = −40°C to +150°C Vout −1.5% 4.925 5.0 +1.5% 5.075 V Line Regulation Vin = 5.4 V to 12 V, Iload = 0.1 mA LineReg 0.04 mV/V Load Regulation Vin = 5.4 V, Iload = 0.1 mA to 500 mA LoadReg 0.04 mV/mA Dropout Voltage (See App Note) Iload = 500 mA Iload = 300 mA Iload = 50 mA Iload = 0.1 mA VDO Peak Output Current (See Figure 7) Ipk Short Output Current (See Figure 7) Isc Thermal Shutdown TJ mV 340 230 110 10 Ground Current In Regulation Iload = 500 mA (Note 7) Iload = 300 mA (Note 7) Iload = 50 mA Iload = 0.1 mA 500 700 830 mA 930 mA °C 160 IGND In Dropout Vin = Vout −0.1 V, Iload = 0.1 mA In Shutdown SD = 0 V IGNDsh Output Noise Cnr = 0 nF, Iload = 500 mA, f = 10 Hz to 100 kHz, Cout = 10 mF Cnr = 10 nF, Iload = 500 mA, f = 10 Hz to 100 kHz, Cout = 10 mF 9.0 4.6 0.8 − 14 7.5 2.5 190 mA − 500 mA 0.07 1.0 mA Vnoise mVrms mVrms 93 58 Shutdown Threshold Voltage ON Threshold Voltage OFF mA 2.0 0.4 V V ISD 0.07 1.0 mA Output Current In Shutdown Mode, Vout = 0 V IOSD 0.07 1.0 mA Reverse Bias Protection, Current Flowing from the Output Pin to GND (Vin = 0 V, Vout_forced = 5.0 V) IOUTR 10 SD Input Current, VSD = 0 V to 0.4 V or VSD = 2.0 V to Vin 7. TA must be greater than 0°C. http://onsemi.com 7 mA NCP3335A ELECTRICAL CHARACTERISTICS – Adjustable (Vout = 1.25 V typical, Vin = 2.9 V, TA = −40°C to +85°C, unless otherwise noted) Symbol Min Typ Max Unit Reference Voltage (Accuracy) Vin = 2.9 V to Vout + 4.0 V, Iload = 0.1 mA to 500 mA, TJ = 25°C Characteristic Vref −0.9% 1.239 1.25 +0.9% 1.261 V Reference Voltage (Accuracy) Vin = 2.9 V to Vout + 4.0 V, Iload = 0.1 mA to 500 mA, TJ = 0°C to +85°C Vref −1.4% 1.233 1.25 +1.4% 1.268 V Reference Voltage (Accuracy) (Note 8) Vin = 2.9 V to Vout + 4.0 V, Iload = 0.1 mA to 500 mA, TJ = −40°C to +150°C Vref −1.5% 1.231 1.25 +1.5% 1.269 V Line Regulation Vin = 2.9 V to 12 V, Iload = 0.1 mA LineReg 0.04 mV/V Load Regulation Vin = 2.9 V, Iload = 0.1 mA to 500 mA LoadReg 0.04 mV/mA Dropout Voltage (See App Note), Vout = 2.5 V to 10 V Iload = 500 mA (Note 9) Iload = 300 mA Iload = 50 mA Iload = 0.1 mA VDO Peak Output Current (Note 9) (See Figure 7) Ipk mV 340 230 110 10 Vout ≤ 3.3 V Vout > 3.3 V Short Output Current (See Figure 7) Thermal Shutdown 500 Isc TJ Ground Current In Regulation Iload = 500 mA (Note 9) Iload = 300 mA (Note 9) Iload = 50 mA Iload = 0.1 mA 700 860 mA 900 990 mA °C 160 IGND In Dropout Vin = Vout −0.1 V, Iload = 0.1 mA In Shutdown SD = 0 V IGNDsh Output Noise Cnr = 0 nF, Iload = 500 mA, f = 10 Hz to 100 kHz, Cout = 10 mF Cnr = 10 nF, Iload = 500 mA, f = 10 Hz to 100 kHz, Cout = 10 mF 9.0 4.6 0.8 − 14 7.5 2.5 190 mA − 500 mA 0.07 1.0 mA Vnoise mVrms mVrms 38 26 Shutdown Threshold Voltage ON Threshold Voltage OFF 2.0 0.4 Vin ≤ 5.4 V Vin > 5.4 V mA V V ISD 0.07 1.0 5.0 mA Output Current In Shutdown Mode, Vout = 0 V IOSD 0.07 1.0 mA Reverse Bias Protection, Current Flowing from the Output Pin to GND (Vin = 0 V, Vout_forced = Vout (nom) ≤ 7 V) (Note 10) IOUTR 1.0 SD Input Current, VSD = 0 V to 0.4 V or VSD = 2.0 V to Vin 8. For output current capability for TJ < 0°C, please refer to Figure 9. 9. TA must be greater than 0°C. 10. Reverse bias protection feature valid only if Vout − Vin ≤ 7 V. http://onsemi.com 8 mA NCP3335A 400 12 350 250 200 150 6 300 mA 4 50 mA 100 2 50 50 mA 0 0 0 20 40 60 80 100 120 140 TJ (°C) 0 80 TJ (°C) Figure 3. Dropout Voltage vs. Temperature Figure 4. Ground Current vs. Temperature 1000 2.540 900 2.530 800 2.520 700 Ipk (mA), Isc (mA) 2.550 2.510 2.500 2.490 2.480 40 60 100 120 140 Isc Ipk 600 500 400 300 2.470 200 2.460 100 2.450 −40 −20 20 0 0 20 40 60 80 100 120 0 140 20 40 60 80 100 120 TJ (°C) TJ (°C) Figure 5. Output Voltage vs. Temperature Figure 6. Peak and Short Current vs. Temperature 0.97 Vout Vout (V) VOUT (V) 500 mA 8 300 mA IGND (mA) VDO (mV) 10 500 mA 300 Ipk Isc Iout (mA) (For specific values of Ipk and Isc, please refer to Figure 6) Figure 7. Output Voltage vs. Output Current http://onsemi.com 9 140 NCP3335A 0.8 0.8 0.7 0.7 0°C 0.6 0.6 −20°C −40°C IOUT, (A) IOUT (A) 0.5 0.4 0.3 0.1 3.5 3.4 3.3 3.2 3.1 3.0 2.9 2.8 2.7 2.6 2.5 VIN (V) VIN, (V) Figure 8. Output Current Capability for the 2.85 V Version Figure 9. Output Current Capability for the 2.5 V Version 450 NOISE DENSITY (nV/ǠHz) 500 90 80 70 50 mA 250 mA 50 500 mA 40 30 Vout = 2.5 V Cout = 10 mF TJ = 25°C Cout = 1.0 mF Cnr = 0 nF 400 350 250 200 Cout = 1.0 mF Cnr = 10 nF 150 100 Vout = 2.5 V Iout = 500 mA TJ = 25°C 0 0.1 1.0 10 0.01 100 Cout = 10 mF Cnr = 0 nF 300 50 Cout = 10 mF Cnr = 10 nF 0.1 1.0 10 F, FREQUENCY (kHz) F, FREQUENCY (kHz) Figure 10. Ripple Rejection vs. Frequency Figure 11. Output Noise Density 5.10 OUTPUT VOLTAGE, VOUT (V) 0 0.01 −20°C 0 100 10 −30°C 0.3 0.1 20 −40°C 0.4 0.2 0 3.85 3.75 3.65 3.55 3.45 3.35 3.25 3.15 3.05 2.95 2.85 RR, RIPPLE REJECTION (dB) 0.5 0.2 60 −10°C 0°C 5.05 5.00 4.95 VOUT = 5 V 4.90 4.85 −40 −15 10 35 60 85 110 135 150 TEMPERATURE (°C) Figure 12. Output Voltage vs. Temperature http://onsemi.com 10 100 NCP3335A 350 300 300 250 qJA (°C/W) 1 oz CF 200 2 oz CF 150 200 150 1 oz CF 100 100 2 oz CF 50 50 0 0 100 200 300 400 500 COPPER HEAT SPREADING AREA 600 700 0 100 (mm2) 200 Vin at Data Sheet Test Conditions, 25°C, 1 mF Capacitance 10 Unstable Area 5.0 Stable Area 0 100 200 300 400 500 OUTPUT CURRENT (mA) Figure 15. Stability with ESR vs. Iout 15 5 V, 0.1 mF 5 V, 10 mF 5 V, 1.0 mF 10 1.25 V, M8 5.0 Min ESR 0 0 100 400 500 600 700 (mm2) Figure 14. DFN 10 Self Heating Thermal Characteristic as a Function of Copper Area on the PCB 15 0 300 COPPER HEAT SPREADING AREA Figure 13. Micro 8 Self Heating Thermal Characteristic as a Function of Copper Area on the PCB MAXIMUM ESR (W) 0 ESR (W) qJA (°C/W) 250 200 300 400 OUTPUT CURRENT (mA) Figure 16. Output Current vs. ESR http://onsemi.com 11 500 NCP3335A APPLICATIONS INFORMATION Reverse Bias Protection is recommended to further reduce output noise and improve stability. Reverse bias is a condition caused when the input voltage goes to zero, but the output voltage is kept high either by a large output capacitor or another source in the application which feeds the output pin. Normally in a bipolar LDO all the current will flow from the output pin to input pin through the PN junction with limited current capability and with the potential to destroy the IC. Due to an improved architecture, the NCP3335A can withstand up to 7.0 V on the output pin with virtually no current flowing from output pin to input pin, and only negligible amount of current (tens of mA) flowing from the output pin to ground for infinite duration. Adjustable Operation The output voltage can be set by using a resistor divider as shown in Figure 2 with a range of 1.25 to 10 V. The appropriate resistor divider can be found by solving the equation below. The recommended current through the resistor divider is from 10 mA to 100 mA. This can be accomplished by selecting resistors in the kW range. As result, the Iadj*R2 becomes negligible in the equation and can be ignored. ǒ Ǔ Vout + 1.25 * 1 ) R1 ) Iadj * R2 R2 (eq. 1) Example: For Vout = 2.9 V, can use R1 = 36 kW and R2 = 27 kW. Input Capacitor An input capacitor of at least 1.0 mF, any type, is recommended to improve the transient response of the regulator and/or if the regulator is located more than a few inches from the power source. It will also reduce the circuit’s sensitivity to the input line impedance at high frequencies. The capacitor should be mounted with the shortest possible track length directly across the regular’s input terminals. ǒ Ǔ 1.25 * 1 ) 36 kW + 2.91 V 27 kW (eq. 2) Dropout Voltage The voltage dropout is measured at 97% of the nominal output voltage. Thermal Considerations Output Capacitor Internal thermal limiting circuitry is provided to protect the integrated circuit in the event that the maximum junction temperature is exceeded. This feature provides protection from a catastrophic device failure due to accidental overheating. This protection feature is not intended to be used as a substitute to heat sinking. The maximum power that can be dissipated, can be calculated with the equation below: The NCP3335A remains stable with any type of capacitor as long as it fulfills its 1.0 mF requirement. There are no constraints on the minimum ESR and it will remain stable up to an ESR of 5.0 W. Larger capacitor values will improve the noise rejection and load transient response. Noise Reduction Pin Output noise can be greatly reduced by connecting a 10 nF capacitor (Cnr) between the noise reduction pin and ground (see Figure 1). In applications where very low noise is not required, the noise reduction pin can be left unconnected. For the adjustable version, in addition to the 10 nF Cnr, a 68 pF capacitor connected in parallel with R1 (see Figure 2) PD + TJ(max) * TA RqJA (eq. 3) For improved thermal performance, contact the factory for the DFN package option. The DFN package includes an exposed metal pad that is specifically designed to reduce the junction to air thermal resistance, RqJA. http://onsemi.com 12 NCP3335A ORDERING INFORMATION Nominal Output Voltage Package Shipping † NCP3335ADM250R2G 2.5 V Micro8 (Pb−Free) 4000 / Tape & Reel NCP3335ADM285R2G 2.85 V Micro8 (Pb−Free) 4000 / Tape & Reel NCP3335ADM330R2G 3.3 V Micro8 (Pb−Free) 4000 / Tape & Reel NCP3335ADM500R2G 5.0 V Micro8 (Pb−Free) 4000 / Tape & Reel NCP3335ADMADJR2G Adj. Micro8 (Pb−Free) 4000 / Tape & Reel NCP3335AMN250R2G 2.5 V DFN10 (Pb−Free) 3000 / Tape & Reel NCP3335AMN285R2G 2.85 V DFN10 (Pb−Free) 3000 / Tape & Reel NCP3335AMN330R2G 3.3 V DFN10 (Pb−Free) 3000 / Tape & Reel NCP3335AMN500R2G 5.0 V DFN10 (Pb−Free) 3000 / Tape & Reel NCP3335AMNADJR2G Adj. DFN10 (Pb−Free) 3000 / Tape & Reel Device †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. *Please contact factory for other voltage options. http://onsemi.com 13 NCP3335A PACKAGE DIMENSIONS Micro8 CASE 846A−02 ISSUE G NOTES: 1. DIMENSIONING AND TOLERANCING PER ANSI Y14.5M, 1982. 2. CONTROLLING DIMENSION: MILLIMETER. 3. DIMENSION A DOES NOT INCLUDE MOLD FLASH, PROTRUSIONS OR GATE BURRS. MOLD FLASH, PROTRUSIONS OR GATE BURRS SHALL NOT EXCEED 0.15 (0.006) PER SIDE. 4. DIMENSION B DOES NOT INCLUDE INTERLEAD FLASH OR PROTRUSION. INTERLEAD FLASH OR PROTRUSION SHALL NOT EXCEED 0.25 (0.010) PER SIDE. 5. 846A−01 OBSOLETE, NEW STANDARD 846A−02. D HE PIN 1 ID E DIM A A1 b c D E e L HE e b 8 PL 0.08 (0.003) M T B S A S SEATING −T− PLANE 0.038 (0.0015) MILLIMETERS NOM MAX −− 1.10 0.08 0.15 0.33 0.40 0.18 0.23 3.00 3.10 3.00 3.10 0.65 BSC 0.40 0.55 0.70 4.75 4.90 5.05 MIN −− 0.05 0.25 0.13 2.90 2.90 A A1 L c SOLDERING FOOTPRINT* 8X 1.04 0.041 0.38 0.015 3.20 0.126 6X 8X 4.24 0.167 0.65 0.0256 5.28 0.208 SCALE 8:1 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. http://onsemi.com 14 INCHES NOM −− 0.003 0.013 0.007 0.118 0.118 0.026 BSC 0.021 0.016 0.187 0.193 MIN −− 0.002 0.010 0.005 0.114 0.114 MAX 0.043 0.006 0.016 0.009 0.122 0.122 0.028 0.199 NCP3335A PACKAGE DIMENSIONS DFN10 CASE 485C−01 ISSUE A D PIN 1 REFERENCE A B ÇÇÇÇ ÇÇÇÇ ÇÇÇÇ L1 E DETAIL A Bottom View (Optional) 0.15 C 2X TOP VIEW 0.15 C 2X DIM A A1 A3 b D D2 E E2 e K L L1 (A3) DETAIL B 0.10 C NOTES: 1. DIMENSIONING AND TOLERANCING PER ASME Y14.5M, 1994. 2. CONTROLLING DIMENSION: MILLIMETERS. 3. DIMENSION b APPLIES TO PLATED TERMINAL AND IS MEASURED BETWEEN 0.25 AND 0.30 MM FROM TERMINAL. 4. COPLANARITY APPLIES TO THE EXPOSED PAD AS WELL AS THE TERMINALS. 5. TERMINAL b MAY HAVE MOLD COMPOUND MATERIAL ALONG SIDE EDGE. MOLD FLASHING MAY NOT EXCEED 30 MICRONS ONTO BOTTOM SURFACE OF TERMINAL b. 6. DETAILS A AND B SHOW OPTIONAL VIEWS FOR END OF TERMINAL LEAD AT EDGE OF PACKAGE. EDGE OF PACKAGE A 10X 0.08 C SIDE VIEW D2 10X SEATING PLANE A1 C DETAIL A e L 1 MOLD CMPD 5 E2 10X K EXPOSED Cu A3 A1 DETAIL B Side View (Optional) 10 10X 6 b 0.10 C A B 0.05 C ÉÉ ÉÉ MILLIMETERS MIN MAX 0.80 1.00 0.00 0.05 0.20 REF 0.18 0.30 3.00 BSC 2.45 2.55 3.00 BSC 1.75 1.85 0.50 BSC 0.19 TYP 0.35 0.45 0.00 0.03 BOTTOM VIEW NOTE 3 The products described herein NCP3335A, may be covered by one or more of the following U.S. patents; 5,920,184, 5,966,004, and 5,834,926. There may be other patents pending. Micro8 is a trademark of International Rectifier. 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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