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NCP1402 200 mA, PFM Step-Up Micropower Switching Regulator
The NCP1402 series are monolithic micropower step-up DC to DC converter that are specially designed for powering portable equipment from one or two cell battery packs.These devices are designed to start-up with a cell voltage of 0.8 V and operate down to less than 0.3 V. With only three external components, this series allow a simple means to implement highly efficient converters that are capable of up to 200 mA of output current at Vin = 2.0 V, VOUT = 3.0 V. Each device consists of an on-chip PFM (Pulse Frequency Modulation) oscillator, PFM controller, PFM comparator, soft-start, voltage reference, feedback resistors, driver, and power MOSFET switch with current limit protection. Additionally, a chip enable feature is provided to power down the converter for extended battery life. The NCP1402 device series are available in the Thin SOT-23-5 package with five standard regulated output voltages. Additional voltages that range from 1.8 V to 5.0 V in 100 mV steps can be manufactured.
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5 1 SOT23-5 (TSOP-5, SC59-5) SN SUFFIX CASE 483
PIN CONNECTIONS AND MARKING DIAGRAM
CE OUT NC 1 xxxYW 2 3 5 LX
* * * * * * * * * * * * * * * * *
Extremely Low Start-Up Voltage of 0.8 V Operation Down to Less than 0.3 V High Efficiency 85% (Vin = 2.0 V, VOUT = 3.0 V, 70 mA) Low Operating Current of 30 mA (VOUT = 1.9 V) Output Voltage Accuracy 2.5% Low Converter Ripple with Typical 30 mV Only Three External Components Are Required Chip Enable Power Down Capability for Extended Battery Life Micro Miniature Thin SOT-23-5 Packages Cellular Telephones Pagers Personal Digital Assistants (PDA) Electronic Games Portable Audio (MP3) Camcorders Digital Cameras Handheld Instruments
4
GND
xxx = Marking Y = Year W = Work Week (Top View)
ORDERING INFORMATION
See detailed ordering and shipping information in the ordering information section on page 3 of this data sheet.
Typical Applications
(c) Semiconductor Components Industries, LLC, 2003
1
November, 2003 - Rev. 5
Publication Order Number: NCP1402/D
NCP1402
Vin CE 1 OUT NCP1402 2 NC 3 LX 5
VOUT
GND 4
Figure 1. Typical Step-Up Converter Application
OUT 2
VLX LIMITER
LX 5
DRIVER NC 3 - + VOLTAGE REFERENCE GND 4 PFM COMPARATOR PFM CONTROLLER POWER SWITCH
SOFT-START PFM OSCILLATOR
1 CE
Figure 2. Representative Block Diagram PIN FUNCTION DESCRIPTIONS
Pin # 1 Symbol CE Pin Description Chip Enable pin Chi in () (1) The chip is enabled if a voltage which is equal to or greater than 0.9 V is applied g q g (2) Th hi i di bl d ( ) The chip is disabled if a voltage which is less than 0.3 V is applied l hi h i l h i li d (3) The chip will be enabled if it is left floating Output voltage monitor pin, also the power supply pin of the device No internal connection to this pin Ground pin External inductor connection pin to power switch drain
2 3 4 5
OUT NC GND LX
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NCP1402
ORDERING INFORMATION
Device NCP1402SN19T1 NCP1402SN27T1 NCP1402SN30T1 NCP1402SN33T1 NCP1402SN40T1 NCP1402SN50T1 Output Voltage 1.9 V 2.7 V 3.0 V 3.3 V 4.0 V 5.0 V Device Marking DAU DAE DAF DAG DCR DAH SOT23-5 3000 Units Per Reel Package Shipping
NOTE: The ordering information lists five standard output voltage device options. Additional device with output voltage ranging from 1.8 V to 5.0 V in 100 mV increments can be manufactured. Contact your ON Semiconductor representative for availability.
ABSOLUTE MAXIMUM RATINGS
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Power Supply Voltage (Pin 2) Input/Output Pins LX (Pin 5) LX Peak Sink Current CE (Pin 1) Input Voltage Range Input Current Range VOUT VLX ILX 6.0 V -0.3 to 6.0 400 V mA V mA VCE ICE -0.3 to 6.0 -150 to 150 250 Thermal Resistance Junction to Air RJA TA TJ C/W C C C Operating Ambient Temperature Range (Note 2) Operating Junction Temperature Range Storage Temperature Range -40 to +85 -40 to +125 -55 to +150 Tstg NOTES: 1. This device series contains ESD protection and exceeds the following tests: Human Body Model (HBM) 2.0 kV per JEDEC standard: JESD22-A114. Machine Model (MM) 200 V per JEDEC standard: JESD22-A115. 2. The maximum package power dissipation limit must not be exceeded. TJ(max) * TA PD + RqJA 3. Latch-up Current Maximum Rating: 150 mA per JEDEC standard: JESD78. 4. Moisture Sensitivity Level: MSL 1 per IPC/JEDEC standard: J-STD-020A.
Rating
Symbol
Value
Unit
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NCP1402
ELECTRICAL CHARACTERISTICS (For all values TA = 25C, unless otherwise noted.)
Characteristic OSCILLATOR Switch On Time (current limit not asserted) Switch Minimum Off Time Maximum Duty Cycle Minimum Start-up Voltage (IO = 0 mA) Minimum Start-up Voltage Temperature Coefficient (TA = -40C to 85C) Minimum Operation Hold Voltage (IO = 0 mA) Soft-Start Time (VOUT u 0.8 V) LX (PIN 5) Internal Switching N-Channel FET Drain Voltage LX Pin On-State Sink Current (VLX = 0.4 V) Device Suffix: 19T1 27T1 30T1 33T1 40T1 50T1 Voltage Limit Off-State Leakage Current (VLX = 6.0 V, TA = -40C to 85C) CE (PIN 1) CE Input Voltage (VOUT = VSET x 0.96) High State, Device Enabled Low State, Device Disabled CE Input Current (Note 6) High State, Device Enabled (VOUT = VCE = 6.0 V) Low State, Device Disabled (VOUT = 6.0 V, VCE = 0 V) TOTAL DEVICE Output Voltage Device Suffix: 19T1 27T1 30T1 33T1 40T1 50T1 Output Voltage Temperature Coefficient (TA = -40C to +85C) Device Suffix: 19T1 27T1 30T1 33T1 40T1 50T1 Operating Current 2 (VOUT = VCE = VSET +0.5 V, Note 5) Off-State Current (VOUT = 5.0 V, VCE = 0 V, TA = -40C to +85C, Note 6) Operating Current 1 (VOUT = VCE = VSET x 0.96) Device Suffix: 19T1 27T1 30T1 33T1 40T1 50T1 5. VSET means setting of output voltage. 6. CE pin is integrated with an internal 10 M pull-up resistor. VOUT 1.853 2.632 2.925 3.218 3.900 4.875 DVOUT - - - - - - IDD2 IOFF IDD1 - - - - - - 30 39 42 45 55 70 50 60 60 60 100 100 - - 150 150 150 150 150 150 13 0.6 - - - - - - 15 1.0 A A A 1.9 2.7 3.0 3.3 4.0 5.0 1.948 2.768 3.075 3.383 4.100 5.125 ppm/C V V VCE(high) VCE(low) ICE(high) ICE(low) 0.9 - -0.5 -0.5 - - 0 0.15 - 0.3 A 0.5 0.5 VLX ILX 110 130 130 130 130 130 VLXLIM ILKG 0.45 - 145 180 190 200 210 215 0.65 0.5 - - - - - - 0.9 1.0 V A - - 6.0 V mA ton toff DMAX Vstart DVstart Vhold tSS 3.6 1.0 70 - - 0.3 0.3 5.5 1.45 78 0.8 -1.6 - 2.0 7.6 1.9 85 0.95 - - - ms ms % V mV/C V ms Symbol Min Typ Max Unit
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NCP1402
2.1 VOUT, OUTPUT VOLTAGE (V) VOUT, OUTPUT VOLTAGE (V) NCP1402SN19T1 L = 47 H TA = 25C 4.0 NCP1402SN30T1 L = 47 H TA = 25C Vin = 2.5 V 3.0 Vin = 0.9 V 2.5 Vin = 1.2 V Vin = 1.5 V Vin = 2.0 V
2.0
3.5
1.9 Vin = 0.9 V 1.8 Vin = 1.2 V Vin = 1.5 V
1.7
2.0
1.6 0 20 40 60 80 100 120 140 160 180 200 IO, OUTPUT CURRENT (mA)
1.5
0
20
40
60
80
100 120 140 160 180 200
IO, OUTPUT CURRENT (mA)
Figure 3. NCP1402SN19T1 Output Voltage vs. Output Current
Figure 4. NCP1402SN30T1 Output Voltage vs. Output Current
6.0 VOUT, OUTPUT VOLTAGE (V) Vin = 4.0 V 5.0 Vin = 1.2 V Vin = 0.9 V 3.0 Vin = 2.0 V Vin = 3.0 V EFFICIENCY (%) Vin = 1.5 V 4.0
100
80
Vin = 1.5 V
60 Vin = 0.9 V 40 NCP1402SN19T1 L = 47 H TA = 25C 0 20 40 60 80 100 120 140 160 180 200 Vin = 1.2 V
2.0
NCP1402SN50T1 L = 47 H TA = 25C 0 20 40 60 80 100 120 140 160 180 200
20
1.0 IO, OUTPUT CURRENT (mA)
0 IO, OUTPUT CURRENT (mA)
Figure 5. NCP1402SN50T1 Output Voltage vs. Output Current
100 Vin = 2.5 V 80 EFFICIENCY (%) EFFICIENCY (%) Vin = 2.0 V 60 Vin = 0.9 V 40 Vin = 1.2 V Vin = 1.5 V 80 100
Figure 6. NCP1402SN19T1 Efficiency vs. Output Current
Vin = 4.0 V Vin = 3.0 V Vin = 1.2 V 60 Vin = 0.9 V 40 NCP1402SN50T1 L = 47 H TA = 25C 0 20 40 60 80 100 120 140 160 180 200 Vin = 1.5 V Vin = 2.0 V
20
NCP1402SN30T1 L = 47 H TA = 25C 0 20 40 60 80 100 120 140 160 180 200
20 0
0 IO, OUTPUT CURRENT (mA)
IO, OUTPUT CURRENT (mA)
Figure 7. NCP1402SN30T1 Efficiency vs. Output Current
Figure 8. NCP1402SN50T1 Efficiency vs. Output Current
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NCP1402
3.2 VOUT, OUTPUT VOLTAGE (V)
2.1 VOUT, OUTPUT VOLTAGE (V) 2.0
3.1
1.9
3.0
1.8
2.9
1.7
NCP1402SN19T1 VOUT = 1.9 V x 0.96 Open-Loop Test -25 0 25 50 75 100
2.8
NCP1402SN30T1 VOUT = 3.0 V x 0.96 Open-Loop Test -25 0 25 50 75 100
1.6 -50
2.7 -50
TEMPERATURE (C)
TEMPERATURE (C)
Figure 9. NCP1402SN19T1 Output Voltage vs. Temperature
Figure 10. NCP1402SN30T1 Output Voltage vs. Temperature
5.2 IDD1, OPERATING CURRENT 1 (mA) VOUT, OUTPUT VOLTAGE (V) NCP1402SN50T1 VOUT = 5.0 V x 0.96 Open-Loop Test
100 NCP1402SN19T1 VOUT = 1.9 V x 0.96 Open-Loop Test
5.1
80
5.0
60
4.9
40
4.8
20
4.7 -50
-25
0
25
50
75
100
0 -50
-25
0
25
50
75
100
TEMPERATURE (C)
TEMPERATURE (C)
Figure 11. NCP1402SN50T1 Output Voltage vs. Temperature
100 IDD1, OPERATING CURRENT 1 (mA) NCP1402SN30T1 VOUT = 3.0 V x 0.96 Open-Loop Test 100
Figure 12. NCP1402SN19T1 Operating Current 1 vs. Temperature
IDD1, OPERATING CURRENT 1 (mA)
80
80
NCP1402SN50T1 VOUT = 5.0 V x 0.96 Open-Loop Test
60
60
40
40
20
20
0 -50
-25
0
25
50
75
100
0 -50
-25
0
25
50
75
100
TEMPERATURE (C)
TEMPERATURE (C)
Figure 13. NCP1402SN30T1 Operating Current 1 vs. Temperature
Figure 14. NCP1402SN50T1 Operating Current 1 vs. Temperature
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NCP1402
7.5 ton, SWITCH ON TIME (s) 7.5
7.0
ton, SWITCH ON TIME (s)
7.0
6.5
6.5
6.0
6.0
5.5
NCP1402SN19T1 VOUT = 1.9 V x 0.96 Open-Loop Test -25 0 25 50 75 100
5.5
NCP1402SN30T1 VOUT = 3.0 V x 0.96 Open-Loop Test -25 0 25 50 75 100
5.0 -50
5.0 -50
TEMPERATURE (C)
TEMPERATURE (C)
Figure 15. NCP1402SN19T1 Switch On Time vs. Temperature
Figure 16. NCP1402SN30T1 Switch On Time vs. Temperature
6.5
toff, MINIMUM SWITCH OFF TIME (s)
7.0 ton, SWITCH ON TIME (s)
1.9
1.8
6.0
1.7
5.5
1.6
5.0
NCP1402SN50T1 VOUT = 5.0 V x 0.96 Open-Loop Test -25 0 25 50 75 100
1.5 1.4 -50
NCP1402SN19T1 VOUT = 1.9 V x 0.96 Open-Loop Test -25 0 25 50 75 100
4.5 -50
TEMPERATURE (C)
TEMPERATURE (C)
Figure 17. NCP1402SN50T1 Switch On Time vs. Temperature
1.8 1.8
Figure 18. NCP1402SN19T1 Minimum Switch Off Time vs. Temperature
toff, MINIMUM SWITCH OFF TIME (s)
toff, MINIMUM SWITCH OFF TIME (s)
1.7
1.7
1.6
1.6
1.5
1.5
1.4
NCP1402SN30T1 VOUT = 3.0 V x 0.96 Open-Loop Test -25 0 25 50 75 100
1.4
NCP1402SN50T1 VOUT = 5.0 V x 0.96 Open-Loop Test -25 0 25 50 75 100
1.3 -50
1.3 -50
TEMPERATURE (C)
TEMPERATURE (C)
Figure 19. NCP1402SN30T1 Minimum Switch Off Time vs. Temperature
Figure 20. NCP1402SN50T1 Minimum Switch Off Time vs. Temperature
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NCP1402
100 DMAX, MAXIMUM DUTY CYCLE (%) 90 80 70 60 50 40 -50 NCP1402SN19T1 VOUT = 1.9 V x 0.96 Open-Loop Test -25 0 25 50 75 100 DMAX, MAXIMUM DUTY CYCLE (%) 100 90 80 70 60 50 40 -50 NCP1402SN30T1 VOUT = 3.0 V x 0.96 Open-Loop Test -25 0 25 50 75 100
TEMPERATURE (C)
TEMPERATURE (C)
Figure 21. NCP1402SN19T1 Maximum Duty Cycle vs. Temperature
Figure 22. NCP1402SN30T1 Maximum Duty Cycle vs. Temperature
90 80 70 60 50 40 -50 NCP1402SN50T1 VOUT = 5.0 V x 0.96 Open-Loop Test -25 0 25 50 75 100
ILX, LX PIN ON-STATE CURRENT (mA)
100 DMAX, MAXIMUM DUTY CYCLE (%)
200
180
160
140 NCP1402SN19T1 VOUT = 1.9 V x 0.96 VLX = 0.4 V Open-Loop Test -25 0 25 50 75 100
120
100 -50
TEMPERATURE (C)
TEMPERATURE (C)
Figure 23. NCP1402SN50T1 Maximum Duty Cycle vs. Temperature
250 300
Figure 24. NCP1402SN19T1 LX Pin On-State Current vs. Temperature
ILX, LX PIN ON-STATE CURRENT (mA)
230
ILX, LX PIN ON-STATE CURRENT (mA)
275
210
250
190 NCP1402SN30T1 VOUT = 3.0 V x 0.96 VLX = 0.4 V Open-Loop Test -25 0 25 50 75 100
225 NCP1402SN50T1 VOUT = 5.0 V x 0.96 VLX = 0.4 V Open-Loop Test -25 0 25 50 75 100
170
200
150 -50
175 -50
TEMPERATURE (C)
TEMPERATURE (C)
Figure 25. NCP1402SN30T1 LX Pin On-State Current vs. Temperature
Figure 26. NCP1402SN50T1 LX Pin On-State Current vs. Temperature
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NCP1402
1.0 VLXLIM, VLX VOLTAGE LIMIT (V) VLXLIM, VLX VOLTAGE LIMIT (V) 1.0
0.8
0.8
0.6
0.6
0.4
0.4
0.2 NCP1402SN19T1 Open-Loop Test 0.0 -50 -25 0 25 50 75 100
0.2 NCP1402SN30T1 Open-Loop Test 0.0 -50 -25 0 25 50 75 100
TEMPERATURE (C)
TEMPERATURE (C)
Figure 27. NCP1402SN19T1 VLX Voltage Limit vs. Temperature
Figure 28. NCP1402SN30T1 VLX Voltage Limit vs. Temperature
RDS(on), SWITCH-ON RESISTANCE ()
1.0 VLXLIM, VLX VOLTAGE LIMIT (V)
4.0 3.5 3.0 2.5 2.0 1.5 1.0 -50 NCP1402SN19T1 VOUT = 1.9 V x 0.96 VLX = 0.4 V Open-Loop Test -25 0 25 50 75 100
0.8
0.6
0.4
0.2 NCP1402SN50T1 Open-Loop Test 0.0 -50 -25 0 25 50 75 100
TEMPERATURE (C)
TEMPERATURE (C)
Figure 29. NCP1402SN50T1 VLX Voltage Limit vs. Temperature
3.0 2.5 2.0 1.5 1.0 0.5 0.0 -50 NCP1402SN30T1 VOUT = 3.0 V x 0.96 VLX = 0.4 V Open-Loop Test -25 0 25 50 75 100 3.0 2.5 2.0 1.5 1.0 0.5 0.0 -50
Figure 30. NCP1402SN19T1 Switch-on Resistance vs. Temperature
RDS(on), SWITCH-ON RESISTANCE ()
RDS(on), SWITCH-ON RESISTANCE ()
NCP1402SN50T1 VOUT = 5.0 V x 0.96 VLX = 0.4 V Open-Loop Test -25 0 25 50 75 100
TEMPERATURE (C)
TEMPERATURE (C)
Figure 31. NCP1402SN30T1 Switch-on Resistance vs. Temperature
Figure 32. NCP1402SN50T1 Switch-on Resistance vs. Temperature
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NCP1402
Vstart/Vhold, STARTUP/HOLD VOLTAGE (V) Vstart/Vhold, STARTUP/HOLD VOLTAGE (V) 1.0 Vstart 0.8 1.0 Vstart 0.8
0.6
0.4
NCP1402SN19T1 L = 22 H COUT = 10 F IO = 0 mA
0.6
0.4
NCP1402SN30T1 L = 22 H COUT = 10 F IO = 0 mA
0.2
Vhold
0.2
Vhold
0.0 -50
-25
0
25
50
75
100
0.0 -50
-25
0
25
50
75
100
TEMPERATURE (C)
TEMPERATURE (C)
Figure 33. NCP1402SN19T1 Startup/Hold Voltage vs. Temperature
Figure 34. NCP1402SN30T1 Startup/Hold Voltage vs. Temperature
Vstart/Vhold, STARTUP/HOLD VOLTAGE (V)
1.0 Vstart 0.8 NCP1402SN50T1 L = 22 H COUT = 10 F IO = 0 mA
Vstart/Vhold, STARTUP/HOLD VOLTAGE (V)
2.0
1.5
Vstart
0.6
1.0
Vhold
0.4
0.5
0.2
Vhold
NCP1402SN19T1 L = 47 H COUT = 68 F TA = 25C 0 10 20 30 40 50 60 70 80 90 100
0.0 -50
0.0 IO, OUTPUT CURRENT (mA)
-25
0
25
50
75
100
TEMPERATURE (C)
Figure 35. NCP1402SN50T1 Startup/Hold Voltage vs. Temperature
Vstart/Vhold, STARTUP/HOLD VOLTAGE (V) Vstart/Vhold, STARTUP/HOLD VOLTAGE (V)
Figure 36. NCP1402SN19T1 Startup/Hold Voltage vs. Output Current
2.0
2.0
1.5
Vstart
1.5 Vstart 1.0
1.0 Vhold 0.5 NCP1402SN30T1 L = 47 H COUT = 68 F TA = 25C 0 10 20 30 40 50 60 70 80 90 100
0.5
Vhold
NCP1402SN50T1 L = 47 H COUT = 68 F TA = 25C 20 30 40 50 60 70 80 90 100
0.0 IO, OUTPUT CURRENT (mA)
0.0 0 10 IO, OUTPUT CURRENT (mA)
Figure 37. NCP1402SN30T1 Startup/Hold Voltage vs. Output Current
Figure 38. NCP1402SN50T1 Startup/Hold Voltage vs. Output Current
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NCP1402
5 ms/div VOUT = 1.9 V, Vin = 1.2 V, IO = 30 mA, L = 47 mH, COUT = 68 mF 1. VLX, 1.0 V/div 2. VOUT, 20 mV/div, AC coupled 3. IL, 100 mA/div
5 ms/div VOUT = 1.9 V, Vin = 1.2 V, IO = 70 mA, L = 47 mH, COUT = 68 mF 1. VLX, 1.0 V/div 2. VOUT, 20 mV/div, AC coupled 3. IL, 100 mA/div
Figure 39. NCP1402SN19T1 Operating Waveforms (Medium Load)
Figure 40. NCP1402SN19T1 Operating Waveforms (Heavy Load)
2 ms/div VOUT = 3.0 V, Vin = 1.2 V, IO = 30 mA, L = 47 mH, COUT = 68 mF 1. VLX, 2.0 V/div 2. VOUT, 20 mV/div, AC coupled 3. IL, 100 mA/div
2 ms/div VOUT = 3.0 V, Vin = 1.2 V, IO = 70 mA, L = 47 mH, COUT = 68 mF 1. VLX, 2.0 V/div 2. VOUT, 20 mV/div, AC coupled 3. IL, 100 mA/div
Figure 41. NCP1402SN30T1 Operating Waveforms (Medium Load)
Figure 42. NCP1402SN30T1 Operating Waveforms (Heavy Load)
2 ms/div VOUT = 5.0 V, Vin = 1.5 V, IO = 30 mA, L = 47 mH, COUT = 68 mF 1. VLX, 2.0 V/div 2. VOUT, 20 mV/div, AC coupled 3. IL, 100 mA/div
2 ms/div VOUT = 5.0 V, Vin = 1.5 V, IO = 60 mA, L = 47 mH, COUT = 68 mF 1. VLX, 2.0 V/div 2. VOUT, 20 mV/div, AC coupled 3. IL, 100 mA/div
Figure 43. NCP1402SN50T1 Operating Waveforms (Medium Load) http://onsemi.com
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Figure 44. NCP1402SN50T1 Operating Waveforms (Heavy Load)
NCP1402
Vin = 1.2 V, L = 47 mH, COUT = 68 mF 1. VOUT = 1.9 V (AC coupled), 100 mV/div 2. IO = 0.1 mA to 80 mA
Vin = 1.2 V, L = 47 mH, COUT = 68 mF 1. VOUT = 1.9 V (AC coupled), 100 mV/div 2. IO = 80 mA to 0.1 mA
Figure 45. NCP1402SN19T1 Load Transient Response
Figure 46. NCP1402SN19T1 Load Transient Response
Vin = 1.5 V, L = 47 mH, COUT = 68 mF 1. VOUT = 3.0 V (AC coupled), 100 mV/div 2. IO = 0.1 mA to 80 mA
Vin = 1.5 V, L = 47 mH, COUT = 68 mF 1. VOUT = 3.0 V (AC coupled), 100 mV/div 2. IO = 80 mA to 0.1 mA
Figure 47. NCP1402SN30T1 Load Transient Response
Figure 48. NCP1402SN30T1 Load Transient Response
Vin = 2.4 V, L = 47 mH, COUT = 68 mF 1. VOUT = 5.0 V (AC coupled), 100 mV/div 2. IO = 0.1 mA to 80 mA
Vin = 2.4 V, L = 47 mH, COUT = 68 mF 1. VOUT = 5.0 V (AC coupled), 100 mV/div 2. IO = 80 mA to 0.1 mA
Figure 49. NCP1402SN50T1 Load Transient Response
Figure 50. NCP1402SN50T1 Load Transient Response
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NCP1402
100 Vripple, RIPPLE VOLTAGE (mV) Vripple, RIPPLE VOLTAGE (mV) NCP1402SN19T1 L = 47 H COUT = 68 mF TA = 25C 100 NCP1402SN30T1 L = 47 H COUT = 68 mF TA = 25C Vin = 2.0 V Vin = 0.9 V 40 Vin = 1.2 V Vin = 1.5 V Vin = 2.5 V
80
80
60 Vin = 1.5 V
60
40
Vin = 1.2 V
20 Vin = 0.9 V 0 0 20 40 60 80 100 120 140 160 180 200 IO, OUTPUT CURRENT (mA)
20
0 0 20 40 60 80 100 120 140 160 180 200 IO, OUTPUT CURRENT (mA)
Figure 51. NCP1402SN19T1 Ripple Voltage vs. Output Current
Figure 52. NCP1402SN30T1 Ripple Voltage vs. Output Current
100 Vin = 4.0 V Vin = 2.0 V Vin = 3.0 V IDD1, OPERATING CURRENT 1 (mA) Vripple, RIPPLE VOLTAGE (mV)
100
80 Vin = 1.5 V Vin = 1.2 V 40
80 85C 60 -40C 40 NCP1402SNXXT1 VOUT = VSET x 0.96 Open-loop Test 1 2 3 4 5 6 25C
60
20 Vin = 0.9 V 0 0 20 40 60 80
NCP1402SN50T1 L = 47 H COUT = 68 mF TA = 25C 100 120 140 160 180 200
20
0 IO, OUTPUT CURRENT (mA) VOUT, OUTPUT VOLTAGE (V)
Figure 53. NCP1402SN50T1 Ripple Voltage vs. Output Current
Figure 54. NCP1402SNXXT1 Operating Current 1 vs. Output Voltage
RDS(ON), SWITCH-ON RESISTANCE (W)
ILX, LX PIN ON-STATE CURRENT (mA)
300 -40C 260
3.5 NCP1402SNXXT1 VOUT = VSET x 0.96 VLX = 0.4 V Open-loop Test
3.0
220
25C 85C NCP1402SNXXT1 VOUT = VSET x 0.96 VLX = 0.4 V Open-loop Test 1 2 3 4 5 6
2.5 85C 2.0 25C 1.5 -40C
180
140
100 VOUT, OUTPUT VOLTAGE (V)
1.0 1 2 3 4 5 6 VOUT, OUTPUT VOLTAGE (V)
Figure 55. NCP1402SNXXT1 Pin On-state Current vs. Output Voltage
Figure 56. NCP1402SNXXT1 Switch-On Resistance vs. Output Voltage
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NCP1402
Iin(no load), NO LOAD INPUT CURRENT (A) NCP1402SNXXT1 L = 47 H IO = 0 mA TA = 25C IO(max), MAX. OUTPUT CURRENT (mA) 150 5.0 V 125 100 3.3 V 75 50 25 0 0 1 2 3 4 5 6 Vin, INPUT VOLTAGE (V) 3.0 V 2.7 V 1.9 V 400 3.0 V 300 2.7 V 3.3 V 5.0 V
200
1.9 V
100
0 0 1 2 3
NCP1402SNXXT1 L = 47 H TA = 25C 4 5
Vin, INPUT VOLTAGE (V)
Figure 57. NCP1402SNXXT1 No Load Input Current vs. Input Voltage
Figure 58. NCP1402SNXXT1 Maximum Output Current vs. Input Voltage
DETAILED OPERATING DESCRIPTION
Operation Soft Start
The NCP1402 series are monolithic power switching regulators optimized for applications where power drain must be minimized. These devices operate as variable frequency, voltage mode boost regulators and designed to operate in continuous conduction mode. Potential applications include low powered consumer products and battery powered portable products. The NCP1402 series are low noise variable frequency voltage-mode DC-DC converters, and consist of soft-start circuit, feedback resistor, reference voltage, oscillator, PFM comparator, PFM control circuit, current limit circuit and power switch. Due to the on-chip feedback resistor network, the system designer can get the regulated output voltage from 1.8 V to 5 V with a small number of external components. The operating current is typically 30 mA (VOUT = 1.9 V), and can be further reduced to about 0.6 mA when the chip is disabled (VCE < 0.3 V). The NCP1402 operation can be best understood by examining the block diagram in Figure 2. PFM comparator monitors the output voltage via the feedback resistor. When the feedback voltage is higher than the reference voltage, the power switch is turned off. As the feedback voltage is lower than reference voltage and the power switch has been off for at least a period of minimum off-time decided by PFM oscillator, the power switch is then cycled on for a period of on-time also decided by PFM oscillator, or until current limit signal is asserted. When the power switch is on, current ramps up in the inductor, storing energy in the magnetic field. When the power switch is off, the energy in the magnetic field is transferred to output filter capacitor and the load. The output filter capacitor stores the charge while the inductor current is high, then holds up the output voltage until next switching cycle.
There is a soft start circuit in NCP1402. When power is applied to the device, the soft start circuit pumps up the output voltage to approximately 1.5 V at a fixed duty cycle, the level at which the converter can operate normally. What is more, the start-up capability with heavy loads is also improved.
Regulated Converter Voltage (VOUT)
The VOUT is set by an internal feedback resistor network. This is trimmed to a selected voltage from 1.8 to 5.0 V range in 100 mV steps with an accuracy of $2.5%.
Current Limit
The NCP1402 series utilizes cycle-by-cycle current limiting as a means of protecting the output switch MOSFET from overstress and preventing the small value inductor from saturation. Current limiting is implemented by monitoring the output MOSFET current build-up during conduction, and upon sensing an overcurrent conduction immediately turning off the switch for the duration of the oscillator cycle. The voltage across the output MOSFET is monitored and compared against a reference by the VLX limiter. When the threshold is reached, a signal is sent to the PFM controller block to terminate the power switch conduction. The current limit threshold is typically set at 350 mA.
Enable / Disable Operation
The NCP1402 series offer IC shut-down mode by chip enable pin (CE pin) to reduce current consumption. An internal pull-up resistor tied the CE pin to OUT pin by default i.e. user can float the pin CE for permanent "On". When voltage at pin CE is equal or greater than 0.9 V, the chip will be enabled, which means the regulator is in normal operation. When voltage at pin CE is less than 0.3 V, the chip is disabled, which means IC is shutdown. Important: DO NOT apply a voltage between 0.3 V and 0.9 V to pin CE as this is the CE pin's hyteresis voltage range. Clearly defined output states can only be obtained by applying voltage out of this range.
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NCP1402
APPLICATIONS CIRCUIT INFORMATION
L1 Vin C1 10 mF CE 47 mH D1 LX 5 VOUT C2 68 mF
1 OUT NCP1402 2 NC 3
GND 4
Figure 59. Typical Application Circuit Step-up Converter Design Equations
NCP1402 step-up DC-DC converter designed to operate in continuous conduction mode can be defined by:
Calculation L Equation
vM
Vin2 VOUT IOmax
IPK
(Vin * Vs)ton ) I min L (ton ) toff)IO (Vin * VS)ton * 2L toff (Vin * Vs)ton (VOUT ) VF * Vin) (IL * IO)toff [ DQ ) (IL * IO)ESR COUT
enough to maintain low ripple. Low inductance values supply higher output current, but also increase the ripple and reduce efficiency. Note that values below 27 mH is not recommended due to NCP1402 switch limitations. Higher inductor values reduce ripple and improve efficiency, but also limit output current. The inductor should have small DCR, usually less than 1 W to minimize loss. It is necessary to choose an inductor with saturation current greater than the peak current which the inductor will encounter in the application.
Diode
Imin
toff DQ Vripple *NOTES: - IPK Imin - - IO IOmax - IL - - Vin VOUT - - VF - VS DQ - Vripple - ESR - M -
Peak inductor current Minimum inductor current Desired dc output current Desired maximum dc output current Average inductor current Nominal operating dc input voltage Desired dc output voltage Diode forward voltage Saturation voltage of the internal FET switch Charge stores in the COUT during charging up Output ripple voltage Equivalent series resistance of the output capacitor An empirical factor, when VOUT 3.0 V, M = 8 x 10-6, otherwise M = 5.3 x 10-6.
The diode is the main source of loss in DC-DC converters. The most importance parameters which affect their efficiency are the forward voltage drop, VF, and the reverse recovery time, trr. The forward voltage drop creates a loss just by having a voltage across the device while a current flowing through it. The reverse recovery time generates a loss when the diode is reverse biased, and the current appears to actually flow backwards through the diode due to the minority carriers being swept from the P-N junction. A Schottky diode with the following characteristics is recommended: Small forward voltage, VF < 0.3 V Small reverse leakage current Fast reverse recovery time/ switching speed Rated current larger than peak inductor current, Irated > IPK Reverse voltage larger than output voltage, Vreverse > VOUT
Input Capacitor
EXTERNAL COMPONENT SELECTION
Inductor
The NCP1402 is designed to work well with a 47 mH inductor in most applications. 47 mH is a sufficiently low value to allow the use of a small surface mount coil, but large
The input capacitor can stabilize the input voltage and minimize peak current ripple from the source. The value of the capacitor depends on the impedance of the input source used. Small ESR (Equivalent Series Resistance) Tantalum or ceramic capacitor with value of 10 mF should be suitable.
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NCP1402
Output Capacitor
The output capacitor is used for sustaining the output voltage when the internal MOSFET is switched on and smoothing the ripple voltage. Low ESR capacitor should be used to reduce output ripple voltage. In general, a 47 uF to 68 uF low ESR (0.15 W to 0.30 W) Tantalum capacitor should be appropriate. For applications where space is a critical factor, two parallel 22 uF low profile SMD ceramic capacitors can be used.
An evaluation board of NCP1402 has been made in the size of 23 mm x 20 mm only, as shown in Figures 60 and 61. Please contact your ON Semiconductor representative for availability. The evaluation board schematic diagram, the artwork and the silkscreen of the surface-mount PCB are shown below:
20 mm
23 mm
Figure 60. NCP1402 PFM Step-Up DC-DC Converter Evaluation Board Silkscreen
20 mm
23 mm
Figure 61. NCP1402 PFM Step-Up DC-DC Converter Evaluation Board Artwork (Component Side)
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NCP1402
Components Supplier
Parts Inductor, L1 Schottky Diode, D1 Output Capacitor, C2 Input Capacitor, C1 Supplier Sumida Electric Co. Ltd. ON Semiconductor Corp. KEMET Electronics Corp. KEMET Electronics Corp. Part Number CD54-470L MBR0520LT1 T494D686K010AS T491C106K016AS Description Inductor 47 mH / 0.72 A Schottky Power Rectifier Low ESR Tantalum Capacitor 68 mF / 10 V Low Profile Tantalum Capacitor 10 mF / 16 V Phone (852)-2880-6688 (852)-2689-0088 (852)-2305-1168 (852)-2305-1168
PCB Layout Hints
Grounding
One point grounding should be used for the output power return ground, the input power return ground, and the device switch ground to reduce noise as shown in Figure 62, e.g. : C2 GND, C1 GND, and U1 GND are connected at one point in the evaluation board. The input ground and output ground traces must be thick enough for current to flow through and for reducing ground bounce.
Power Signal Traces
efficiency (short and thick traces for connecting the inductor L can also reduce stray inductance), e.g. : short and thick traces listed below are used in the evaluation board: 1. Trace from TP1 to L1 2. Trace from L1 to Lx pin of U1 3. Trace from L1 to anode pin of D1 4. Trace from cathode pin of D1 to TP2
Output Capacitor
Low resistance conducting paths should be used for the power carrying traces to reduce power loss so as to improve
The output capacitor should be placed close to the output terminals to obtain better smoothing effect on the output ripple.
TP1 Vin
L1 47 H + On Off CE 1 OUT NCP1402 2 NC 3 LX 5 D1 MBR0520LT1 +
TP2 Vout
C1 10 F/16 V
JP1 Enable
C2 68 F/10 V TP3 GND
TP4 GND
GND 6
Figure 62. NCP1402 Evaluation Board Schematic Diagram
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NCP1402
PACKAGE DIMENSIONS
SOT23-5 (TSOP-5, SC59-5) SN SUFFIX CASE 483-02 ISSUE C
D
5 1 2 4 3 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. 4. A AND B DIMENSIONS DO NOT INCLUDE MOLD FLASH, PROTRUSIONS, OR GATE BURRS. MILLIMETERS INCHES DIM MIN MAX MIN MAX A 2.90 3.10 0.1142 0.1220 B 1.30 1.70 0.0512 0.0669 C 0.90 1.10 0.0354 0.0433 D 0.25 0.50 0.0098 0.0197 G 0.85 1.05 0.0335 0.0413 H 0.013 0.100 0.0005 0.0040 J 0.10 0.26 0.0040 0.0102 K 0.20 0.60 0.0079 0.0236 L 1.25 1.55 0.0493 0.0610 M 0_ 10 _ 0_ 10 _ S 2.50 3.00 0.0985 0.1181
S
B
L G A J C 0.05 (0.002) H K M
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 Japan: ON Semiconductor, Japan Customer Focus Center 2-9-1 Kamimeguro, Meguro-ku, Tokyo, Japan 153-0051 Phone: 81-3-5773-3850 ON Semiconductor Website: http://onsemi.com Order Literature: http://www.onsemi.com/litorder For additional information, please contact your local Sales Representative.
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NCP1402/D

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