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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.
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Micro8t DM SUFFIX CASE 846A
* * * * * * * * * * * * * * * * * * * * *
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 PCMCIA Card Cellular Phones Camcoders and Cameras Networking Systems, DSL/Cable Modems Cable Set-Top Box MP3/CD Players DSP Supply Displays and Monitors
DFN10 MN SUFFIX CASE 485C
MARKING DIAGRAM
Fixed Version Pin 1, 2. Vout 3. Sense 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. NR 6. SD 7, 8. Vin Adj Version Pin 1, 2. Vout 3. Adj 4. GND 5, 6. NC 7. NR 8. SD 9, 10. Vin
8 xxx AYWG G 1
1
Applications
3335A xxx ALYWG G
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.
(c) Semiconductor Components Industries, LLC, 2006
1
April, 2006 - Rev. 3
Publication Order Number: NCP3335A/D
NCP3335A
5 NR
Cnr (Optional)
SENSE 7 8 IN + Cin 1.0 mF SD 6 ON OFF GND 4 IN OUT
3 2
Vin
OUT 1 Cout 1.0 mF +
Vout
Figure 1. Typical Fixed Version Application Schematic (Micro8 Package)
5 NR
Cnr 10 nF (Optional) 2 1 3 R1 CADJ 68 pF Cout 1.0 mF + Vout
OUT 7 8 IN + Cin 1.0 mF SD 6 ON OFF GND 4 IN OUT ADJ
Vin
R2
Figure 2. Typical Adjustable Version Application Schematic (Micro8 Package)
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NCP3335A
PIN FUNCTION DESCRIPTION Fixed Version
Micro8 Pin No. 1, 2 3 4 5 6 7, 8 - - DFN10 Pin No. 1, 2 3 4 7 8 9, 10 5, 6 EPAD Pin Name Vout SENSE GND NR SD Vin NC EPAD 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 Noise Reduction Pin. This is an optional pin used to further reduce noise. Shutdown pin. When not in use, this pin should be connected to the input pin. Power Supply Input Voltage Not Connected Exposed thermal pad should be connected to ground.
Adjustable Version
1, 2 3 4 5 6 7, 8 - - 1, 2 3 4 7 8 9, 10 5, 6 EPAD Vout Adj GND NR SD Vin NC EPAD Regulated output voltage. Bypass to ground with Cout w 1.0 mF. Adjustable pin; reference voltage = 1.25 V. Power Supply Ground Noise Reduction Pin. This is an optional pin used to further reduce noise. Shutdown pin. When not in use, this pin should be connected to the input pin. Power Supply Input Voltage Not Connected Exposed thermal pad should be connected to ground.
MAXIMUM RATINGS
Rating Input Voltage Output Voltage Shutdown Pin Voltage Thermal Characteristics Thermal Resistance, Junction-to-Air Symbol Vin Vout Vsh RqJA TJ Tstg Value -0.3 to +16 -0.3 to Vin +0.3 or 10 V* -0.3 to +16 238 -40 to +150 -50 to+150 Unit V V V C/W C C
Operating Junction Temperature Range, Micro8 Storage Temperature Range
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) Characteristic Micro 8 Junction-to-Air, qJA Junction-to-Pin, yJL2 10 Lead DFN EPad Junction-to-Air, qJA Junction-to-Pin, yJL2 215 55 66 17 C/W C/W 264 110 174 100 C/W C/W Min Pad Board (Note 1) 1, Pad Board (Note 1) Unit
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.
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NCP3335A
ELECTRICAL CHARACTERISTICS - 2.5 V (Vout = 2.5 V typical, Vin = 2.9 V, TA = -40C to +85C, unless otherwise noted)
Characteristic Output Voltage (Accuracy) Vin = 2.9 V to 6.5 V, Iload = 0.1 mA to 500 mA, TJ = 25C Output Voltage (Accuracy) Vin = 2.9 V to 6.5 V, Iload = 0.1 mA to 500 mA, TJ = 0C to +85C Output Voltage (Accuracy), (Note 2) Vin = 2.9 V to 6.5 V, Iload = 0.1 mA to 500 mA, TJ = -40C to +150C Line Regulation Vin = 2.9 V to 12 V, Iload = 0.1 mA Load Regulation Vin = 2.9 V, Iload = 0.1 mA to 500 mA Dropout Voltage (See App Note) Iload = 500 mA (Note 3) Iload = 300 mA (Note 3) Iload = 50 mA Iload = 0.1mA Peak Output Current (See Figure 7) Short Output Current (See Figure 7) Thermal Shutdown Ground Current In Regulation Iload = 500 mA (Note 3) Iload = 300 mA (Note 3) Iload = 50 mA Iload = 0.1 mA In Dropout Vin = 2.4 V, Iload = 0.1 mA In Shutdown SD = 0 V 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 Shutdown Threshold Voltage ON Threshold Voltage OFF SD Input Current, VSD = 0 V to 0.4 V or VSD = 2.0 V to Vin Output Current In Shutdown Mode, Vout = 0 V Reverse Bias Protection, Current Flowing from the Output Pin to GND (Vin = 0 V, Vout_forced = 2.5 V) 2. For output current capability for TJ < 0C, please refer to Figure 9. 3. TA must be greater than 0C. ISD IOSD IOUTR IGNDsh Vnoise 56 35 2.0 0.4 0.07 0.07 10 1.0 1.0 0.07 Symbol Vout Vout Vout LineReg LoadReg VDO 340 230 110 10 Ipk Isc TJ IGND 9.0 4.6 0.8 - 14 7.5 2.5 190 500 1.0 mA mA mA mA mVrms mVrms V V mA mA mA 160 500 700 800 900 mA mA C Min -0.9% 2.477 -1.4% 2.465 -1.5% 2.462 Typ 2.5 2.5 2.5 0.04 0.04 Max +0.9% 2.523 +1.4% 2.535 +1.5% 2.538 Unit V V V mV/V mV/mA mV
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NCP3335A
ELECTRICAL CHARACTERISTICS - 2.85 V (Vout = 2.85 V typical, Vin = 3.25 V, TA = -40C to +85C, unless otherwise noted)
Characteristic Output Voltage (Accuracy) Vin = 3.25 V to 6.85 V, Iload = 0.1 mA to 500 mA, TJ = 25C Output Voltage (Accuracy) Vin = 3.25 V to 6.85 V, Iload = 0.1 mA to 500 mA, TJ = 0C to +85C Output Voltage (Accuracy) (Note 4) Vin = 3.25 V to 6.85 V, Iload = 0.1 mA to 500 mA, TJ = -40C to +150C Line Regulation Vin = 3.25 V to 12 V, Iload = 0.1 mA Load Regulation Vin = 3.25 V, Iload = 0.1 mA to 500 mA Dropout Voltage (See App Note) Iload = 500 mA Iload = 300 mA Iload = 50 mA Iload = 0.1mA Peak Output Current (See Figure 7) Short Output Current (See Figure 7) Thermal Shutdown Ground Current In Regulation Iload = 500 mA (Note 5) Iload = 300 mA Iload = 50 mA Iload = 0.1 mA In Dropout Vin = 2.75 V, Iload = 0.1 mA In Shutdown SD = 0 V 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 Shutdown Threshold Voltage ON Threshold Voltage OFF SD Input Current, VSD = 0 V to 0.4 V or VSD = 2.0 V to Vin Output Current In Shutdown Mode, Vout = 0 V Reverse Bias Protection, Current Flowing from the Output Pin to GND (Vin = 0 V, Vout_forced = 2.85 V) 4. For output current capability for TJ < 0C, please refer to Figure 8. 5. TA must be greater than 0C. ISD IOSD IOUTR IGNDsh Vnoise 61 40 2.0 0.4 0.07 0.07 10 1.0 1.0 Symbol Vout Vout Vout LineReg LoadReg VDO 340 230 110 10 Ipk Isc TJ IGND 9.0 4.6 0.8 - - 0.07 14 7.5 2.5 190 500 1.0 mA mA mA mA mVrms mVrms V V mA mA mA 160 500 700 800 900 mA mA C Min -0.9% 2.824 -1.4% 2.810 -1.5% 2.807 Typ 2.85 2.85 2.85 0.04 0.04 Max +0.9% 2.876 +1.4% 2.890 +1.5% 2.893 Unit V V V mV/V mV/mA mV
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NCP3335A
ELECTRICAL CHARACTERISTICS - 3.3 V (Vout = 3.3 V typical, Vin = 3.7 V, TA = -40C to +85C, unless otherwise noted)
Characteristic Output Voltage (Accuracy) Vin = 3.7 V to 7.3 V, Iload = 0.1 mA to 500 mA, TJ = 25C Output Voltage (Accuracy) Vin = 3.7 V to 7.3 V, Iload = 0.1 mA to 500 mA, TJ = 0C to +85C Output Voltage (Accuracy) Vin = 3.7 V to 7.3 V, Iload = 0.1 mA to 500 mA, TJ = -40C to +150C Line Regulation Vin = 3.7 V to 12 V, Iload = 0.1 mA Load Regulation Vin = 3.7 V, Iload = 0.1 mA to 500 mA Dropout Voltage (See App Note) Iload = 500 mA Iload = 300 mA Iload = 50 mA Iload = 0.1 mA Peak Output Current (See Figure 7) Short Output Current (See Figure 7) Thermal Shutdown Ground Current In Regulation Iload = 500 mA (Note 6) Iload = 300 mA Iload = 50 mA Iload = 0.1 mA In Dropout Vin = 3.2 V, Iload = 0.1 mA In Shutdown SD = 0 V 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 Shutdown Threshold Voltage ON Threshold Voltage OFF SD Input Current, VSD = 0 V to 0.4 V or VSD = 2.0 V to Vin Output Current In Shutdown Mode, Vout = 0 V Reverse Bias Protection, Current Flowing from the Output Pin to GND (Vin = 0 V, Vout_forced = 3.3 V) 6. TA must be greater than 0C. ISD IOSD IOUTR IGNDsh Vnoise 69 46 2.0 0.4 0.07 0.07 10 1.0 1.0 Symbol Vout Vout Vout LineReg LoadReg VDO 340 230 110 10 Ipk Isc TJ IGND 9.0 4.6 0.8 - - 0.07 14 7.5 2.5 190 500 1.0 mA mA mA mA mVrms mVrms V V mA mA mA 160 500 700 800 900 mA mA C Min -0.9% 3.270 -1.4% 3.254 -1.5% 3.250 Typ 3.3 3.3 3.3 0.04 0.04 Max +0.9% 3.330 +1.4% 3.346 +1.5% 3.350 Unit V V V mV/V mV/mA mV
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NCP3335A
ELECTRICAL CHARACTERISTICS - 5.0 V (Vout = 5.0 V typical, Vin = 5.4 V, TA = -40C to +85C, unless otherwise noted)
Characteristic Output Voltage (Accuracy) Vin = 5.4 V to 9.0 V, Iload = 0.1 mA to 500 mA, TJ = 25C Output Voltage (Accuracy) Vin = 5.4 V to 9.0 V, Iload = 0.1 mA to 500 mA, TJ = 0C to +85C Output Voltage (Accuracy) Vin = 5.4 V to 9.0 V, Iload = 0.1 mA to 500 mA, TJ = -40C to +150C Line Regulation Vin = 5.4 V to 12 V, Iload = 0.1 mA Load Regulation Vin = 5.4 V, Iload = 0.1 mA to 500 mA Dropout Voltage (See App Note) Iload = 500 mA Iload = 300 mA Iload = 50 mA Iload = 0.1 mA Peak Output Current (See Figure 7) Short Output Current (See Figure 7) Thermal Shutdown Ground Current In Regulation Iload = 500 mA (Note 7) Iload = 300 mA (Note 7) Iload = 50 mA Iload = 0.1 mA In Dropout Vin = Vout -0.1 V, Iload = 0.1 mA In Shutdown SD = 0 V 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 Shutdown Threshold Voltage ON Threshold Voltage OFF SD Input Current, VSD = 0 V to 0.4 V or VSD = 2.0 V to Vin Output Current In Shutdown Mode, Vout = 0 V Reverse Bias Protection, Current Flowing from the Output Pin to GND (Vin = 0 V, Vout_forced = 5.0 V) 7. TA must be greater than 0C. ISD IOSD IOUTR IGNDsh Vnoise 93 58 2.0 0.4 0.07 0.07 10 1.0 1.0 Symbol Vout Vout Vout LineReg LoadReg VDO 340 230 110 10 Ipk Isc TJ IGND 9.0 4.6 0.8 - - 0.07 14 7.5 2.5 190 500 1.0 mA mA mA mA mVrms mVrms V V mA mA mA 160 500 700 830 930 mA mA C Min -0.9% 4.955 -1.4% 4.930 -1.5% 4.925 Typ 5.0 5.0 5.0 0.04 0.04 Max +0.9% 5.045 +1.4% 5.070 +1.5% 5.075 Unit V V V mV/V mV/mA mV
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NCP3335A
ELECTRICAL CHARACTERISTICS - Adjustable (Vout = 1.25 V typical, Vin = 2.9 V, TA = -40C to +85C, unless otherwise noted)
Characteristic Reference Voltage (Accuracy) Vin = 2.9 V to Vout + 4.0 V, Iload = 0.1 mA to 500 mA, TJ = 25C Reference Voltage (Accuracy) Vin = 2.9 V to Vout + 4.0 V, Iload = 0.1 mA to 500 mA, TJ = 0C to +85C Reference Voltage (Accuracy) (Note 8) Vin = 2.9 V to Vout + 4.0 V, Iload = 0.1 mA to 500 mA, TJ = -40C to +150C Line Regulation Vin = 2.9 V to 12 V, Iload = 0.1 mA Load Regulation Vin = 2.9 V, Iload = 0.1 mA to 500 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 Peak Output Current (Note 9) (See Figure 7) Short Output Current (See Figure 7) Thermal Shutdown Ground Current In Regulation Iload = 500 mA (Note 9) Iload = 300 mA (Note 9) Iload = 50 mA Iload = 0.1 mA In Dropout Vin = Vout -0.1 V, Iload = 0.1 mA In Shutdown SD = 0 V 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 Shutdown Threshold Voltage ON Threshold Voltage OFF SD Input Current, VSD = 0 V to 0.4 V or VSD = 2.0 V to Vin Output Current In Shutdown Mode, Vout = 0 V Reverse Bias Protection, Current Flowing from the Output Pin to GND (Vin = 0 V, Vout_forced = Vout (nom) 7 V) (Note 10) 8. For output current capability for TJ < 0C, please refer to Figure 9. 9. TA must be greater than 0C. 10. Reverse bias protection feature valid only if Vout - Vin 7 V. Vin 5.4 V Vin > 5.4 V ISD IOSD IOUTR IGNDsh Vnoise 38 26 2.0 0.4 0.07 0.07 1.0 1.0 5.0 1.0 Vout 3.3 V Vout > 3.3 V Symbol Vref Vref Vref LineReg LoadReg VDO 340 230 110 10 Ipk Isc TJ IGND 9.0 4.6 0.8 - - 0.07 14 7.5 2.5 190 500 1.0 mA mA mA mA mVrms mVrms V V mA mA mA 160 500 700 860 900 990 mA mA C Min -0.9% 1.239 -1.4% 1.233 -1.5% 1.231 Typ 1.25 1.25 1.25 0.04 0.04 Max +0.9% 1.261 +1.4% 1.268 +1.5% 1.269 Unit V V V mV/V mV/mA mV
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NCP3335A
400 350 300 VDO (mV) 250 200 150 100 50 0 0 20 40 60 80 TJ (C) 100 120 140 50 mA 2 50 mA 0 0 20 40 60 80 TJ (C) 100 120 140 500 mA 300 mA 12 10 8 IGND (mA) 6 300 mA 4 500 mA
Figure 3. Dropout Voltage vs. Temperature
Figure 4. Ground Current vs. Temperature
2.550 2.540 2.530 Ipk (mA), Isc (mA) 2.520 VOUT (V) 2.510 2.500 2.490 2.480 2.470 2.460 2.450 -40 -20 0 20 40 60 80 100 120 140
1000 900 800 700 600 500 400 300 200 100 0 0 20 40 60 80 TJ (C) 100 120 140 TJ (C) Ipk Isc
Figure 5. Output Voltage vs. Temperature
Figure 6. Peak and Short Current vs. Temperature
0.97 Vout
Vout (V) Ipk Isc Iout (mA) (For specific values of Ipk and Isc, please refer to Figure 6)
Figure 7. Output Voltage vs. Output Current
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NCP3335A
0.8 0.7 0.6 -20C 0.5 IOUT (A) 0.4 0.3 0.2 0.1 0 3.85 3.75 3.65 3.55 3.45 3.35 3.25 3.15 3.05 2.95 2.85 VIN (V) -40C IOUT, (A) 0.5 0.4 0.3 0.2 0.1 0 3.5 3.4 3.3 3.2 3.1 3.0 2.9 2.8 2.7 2.6 2.5 VIN, (V) -30C -20C -40C 0C 0.8 0.7 0.6 0C -10C
Figure 8. Output Current Capability for the 2.85 V Version
Figure 9. Output Current Capability for the 2.5 V Version
100 RR, RIPPLE REJECTION (dB) 90 80 70 60 50 40 30 20 10 Vout = 2.5 V Cout = 10 mF TJ = 25C 0.1 1.0 F, FREQUENCY (kHz) 10 100 500 mA 250 mA 50 mA NOISE DENSITY (nV/ Hz)
500 450 400 350 300 250 200 150 100 50 0 Vout = 2.5 V Iout = 500 mA TJ = 25C 0.01 0.1 Cout = 1.0 mF Cnr = 10 nF Cout = 10 mF Cnr = 10 nF 1.0 10 100 Cout = 1.0 mF Cnr = 0 nF Cout = 10 mF Cnr = 0 nF
0 0.01
F, FREQUENCY (kHz)
Figure 10. Ripple Rejection vs. Frequency
Figure 11. Output Noise Density
5.10 OUTPUT VOLTAGE, VOUT (V)
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
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NCP3335A
350 300 250 qJA (C/W) 200 150 100 50 0 0 100 200 300 400 500 600 (mm2) 700 COPPER HEAT SPREADING AREA 2 oz CF qJA (C/W) 1 oz CF 300 250 200 150 1 oz CF 100 2 oz CF 50 0 0 100 200 300 400 500 600 (mm2) 700 COPPER HEAT SPREADING AREA
Figure 13. Micro 8 Self Heating Thermal Characteristic as a Function of Copper Area on the PCB
Figure 14. DFN 10 Self Heating Thermal Characteristic as a Function of Copper Area on the PCB
15 Vin at Data Sheet Test Conditions, 25C, 1 mF Capacitance MAXIMUM ESR (W) 10
Unstable Area 5.0
Stable Area 0 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 ESR (W)
1.25 V, M8 5.0 Min ESR
0 0 100 200 300 400 500 OUTPUT CURRENT (mA)
Figure 16. Output Current vs. ESR
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NCP3335A
APPLICATIONS INFORMATION
Reverse Bias Protection
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.
Input Capacitor
is recommended to further reduce output noise and improve stability.
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.
Vout + 1.25 * 1 ) R1 ) Iadj * R2 R2
(eq. 1)
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.
Output Capacitor
Example: For Vout = 2.9 V, can use R1 = 36 kW and R2 = 27 kW.
1.25 * 1 ) 36 kW + 2.91 V 27 kW Dropout Voltage
(eq. 2)
The voltage dropout is measured at 97% of the nominal output voltage.
Thermal Considerations
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
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:
PD + TJ(max) * TA RqJA
(eq. 3)
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)
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.
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NCP3335A
ORDERING INFORMATION
Device NCP3335ADM250R2G NCP3335ADM285R2G NCP3335ADM330R2G NCP3335ADM500R2G NCP3335ADMADJR2G NCP3335AMN250R2G NCP3335AMN285R2G NCP3335AMN330R2G NCP3335AMN500R2G NCP3335AMNADJR2G Nominal Output Voltage 2.5 V 2.85 V 3.3 V 5.0 V Adj. 2.5 V 2.85 V 3.3 V 5.0 V Adj. Package Micro8 (Pb-Free) Micro8 (Pb-Free) Micro8 (Pb-Free) Micro8 (Pb-Free) Micro8 (Pb-Free) DFN10 (Pb-Free) DFN10 (Pb-Free) DFN10 (Pb-Free) DFN10 (Pb-Free) DFN10 (Pb-Free) Shipping 4000 / Tape & Reel 4000 / Tape & Reel 4000 / Tape & Reel 4000 / Tape & Reel 4000 / Tape & Reel 3000 / Tape & Reel 3000 / Tape & Reel 3000 / Tape & Reel 3000 / Tape & Reel 3000 / Tape & Reel
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.
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NCP3335A
PACKAGE DIMENSIONS
Micro8 CASE 846A-02 ISSUE G
D
HE
E
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. 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 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
PIN 1 ID
e b 8 PL 0.08 (0.003)
M
TB
S
A
S
-T- PLANE 0.038 (0.0015) A1
SEATING
DIM A A1 b c D E e L HE
MAX 0.043 0.006 0.016 0.009 0.122 0.122 0.028 0.199
A c L
SOLDERING FOOTPRINT*
8X
1.04 0.041
0.38 0.015
8X
3.20 0.126
4.24 0.167
5.28 0.208
6X
0.65 0.0256
SCALE 8:1
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.
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NCP3335A
PACKAGE DIMENSIONS
DFN10 CASE 485C-01 ISSUE A
D
A B
EDGE OF PACKAGE
E
L1 DETAIL A Bottom View (Optional)
PIN 1 REFERENCE 2X 2X
0.15 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. DIM A A1 A3 b D D2 E E2 e K L L1 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
0.15 C 0.10 C
10X
0.08 C SIDE VIEW A1 C
10X
L
1
E2
10X
K
A1
DETAIL B Side View (Optional)
10 10X 6
b BOTTOM VIEW
0.10 C A B 0.05 C
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. This literature is subject to all applicable copyright laws and is not for resale in any manner.
PUBLICATION ORDERING INFORMATION
LITERATURE FULFILLMENT: N. American Technical Support: 800-282-9855 Toll Free Literature Distribution Center for ON Semiconductor USA/Canada P.O. Box 61312, Phoenix, Arizona 85082-1312 USA Phone: 480-829-7710 or 800-344-3860 Toll Free USA/Canada Japan: ON Semiconductor, Japan Customer Focus Center 2-9-1 Kamimeguro, Meguro-ku, Tokyo, Japan 153-0051 Fax: 480-829-7709 or 800-344-3867 Toll Free USA/Canada Phone: 81-3-5773-3850 Email: orderlit@onsemi.com ON Semiconductor Website: http://onsemi.com Order Literature: http://www.onsemi.com/litorder For additional information, please contact your local Sales Representative.
http://onsemi.com
15
EE EE EE
CCCC CCCC CCCC
DETAIL B
TOP VIEW
(A3) A
SEATING PLANE
D2 e
5
DETAIL A EXPOSED Cu MOLD CMPD
A3
NCP3335A/D

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