NCP1400ASN22T1G

NCP1400A 100 mA, Fixed Frequency PWM Step−Up Micropower Switching Regulator The NCP1400A series are micropower step−up DC to DC converters that are specifically 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 0.2 V. With only four external components, this series allows a simple means to implement highly efficient converters that are capable of up to 100 mA of output current. Each device consists of an on−chip fixed frequency oscillator, pulse width modulation controller, phase compensated error amplifier that ensures converter stability with discontinuous mode operation, soft−start, voltage reference, 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 NCP1400A device series are available in the Thin SOT23−5 package with seven standard regulated output voltages. Additional voltages that range from 1.8 V to 4.9 V in 100 mV steps can be manufactured. Features http://onsemi.com 5 1 THIN SOT23−5 SN SUFFIX CASE 483 PIN CONNECTIONS AND MARKING DIAGRAM CE OUT 1 xxxYW 2 3 (Top View) xxx = Marking Y = Year W = Work Week 5 LX • Extremely Low Start−Up Voltage of 0.8 V • Operation Down to Less than 0.2 V • Only Four External Components for Simple Highly Efficient • • • • • • • • • • • • • Converters Up to 100 mA Output Current Capability Fixed Frequency Pulse Width Modulation Operation Phase Compensated Error Amplifier for Stable Converter Operation Chip Enable Power Down Capability for Extended Battery Life Pb−Free Packages are Available NC 4 GND ORDERING INFORMATION See detailed ordering and shipping information in the ordering information section on page 2 of this data sheet. Typical Applications Cellular Telephones Pagers Personal Digital Assistants Electronic Games Digital Cameras Camcorders Handheld Instruments White LED Torch Light VIN CE 1 OUT 2 NC 3 NCP1400A LX 5 VOUT GND 4 Figure 1. Typical Step−Up Converter Application © Semiconductor Components Industries, LLC, 2004 1 June, 2004 − Rev. 9 Publication Order Number: NCP1400A/D NCP1400A ORDERING INFORMATION Device NCP1400ASN19T1 NCP1400ASN19T1G NCP1400ASN22T1 NCP1400ASN22T1G NCP1400ASN25T1 NCP1400ASN25T1G NCP1400ASN27T1 NCP1400ASN30T1 NCP1400ASN33T1 NCP1400ASN38T1 NCP1400ASN45T1 NCP1400ASN50T1 NCP1400ASN50T1G NOTE: Output Voltage 1.9 V 1.9 V 2.2 V 2.2 V 2.5 V 2.5 V 2.7 V 3.0 V 3.3 V 3.8 V 4.5 V 5.0 V 5.0 V 180 KHz Switching Frequency Marking DAI DAI DCN DCN DAV DAV DAA DAB DAJ DBK DBL DAD DAD Thin SOT23−5 3000 / Tape & Reel (7 Inch Reel) (7 Inch Reel) Package Shipping† The ordering information lists seven standard output voltage device options. Additional devices 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. †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. ABSOLUTE MAXIMUM RATINGS Rating Power Supply Voltage (Pin 2) Input/Output Pins LX (Pin 5) LX Peak Sink Current CE (Pin 1) Input Voltage Range Input Current Range Symbol VOUT VLX ILX Value −0.3 to 6.0 −0.3 to 6.0 400 Unit V ÁÁÁÁ Á Á ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ ÁÁ ÁÁ Á Á ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ Á ÁÁ ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ Á ÁÁ ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ Á ÁÁ ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ Á ÁÁ ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ Á ÁÁ ÁÁ Á ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ ÁÁ ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ Á ÁÁ ÁÁÁÁ Á Á ÁÁ ÁÁ Á ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ Á ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ Á ÁÁ Á ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ Á ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ Á ÁÁ ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ ÁÁ V mA V mA VCE ICE −0.3 to 6.0 −150 to 150 250 Thermal Resistance Junction to Air RqJA 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 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. 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. http://onsemi.com 2 NCP1400A ELECTRICAL CHARACTERISTICS (For all values TA = 25°C, unless otherwise noted.) Characteristic OSCILLATOR Frequency (VOUT = VSET x 0.96, Note 5) Frequency Temperature Coefficient (TA = −40°C to 85°C) Maximum PWM Duty Cycle (VOUT = VSET x 0.96) Minimum Start−up Voltage (IO = 0 mA) Minimum Start−up Voltage Temperature Coefficient (TA = −40°C to 85°C) Minimum Operation Hold Voltage (IO = 0 mA) Soft−Start Time (VOUT u 0.8 V) LX (PIN 5) LX Pin On−State Sink Current (VLX = 0.4 V) Device Suffix: 19T1 22T1 25T1 27T1 30T1 33T1 38T1 45T1 50T1 Voltage Limit (VOUT = VCE = VSET x 0.96, VLX “L’’ Side) Off−State Leakage Current (VLX = 5.0 V, TA = −40°C to 85°C) 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 = 5.0 V) Low State, Device Disabled (VOUT = 5.0 V, VCE = 0 V) 5. VSET means setting of output voltage. 6. CE pin is integrated with an internal 150 nA pull−up current source. V VCE(high) VCE(low) ICE(high) ICE(low) 0.9 − −0.5 −0.5 − − 0 0.15 − 0.3 mA 0.5 0.5 ILX 80 80 80 100 100 100 100 100 100 0.65 − 90 90 120 125 130 135 145 155 160 0.8 0.5 − − − − − − − − − 1.0 1.0 mA fOSC Df DMAX Vstart DVstart Vhold tSS 144 − 68 − − 0.3 0.5 180 0.11 75 0.8 −1.6 − 2.0 216 − 82 0.95 − − − kHz %/°C % V mV/°C V ms Symbol Min Typ Max Unit VLXLIM ILKG V mA http://onsemi.com 3 NCP1400A ELECTRICAL CHARACTERISTICS (continued) (For all values TA = 25°C, unless otherwise noted.) Characteristic TOTAL DEVICE Output Voltage (VIN = 0.7 x VOUT, IO = 10 mA) Device Suffix: 19T1 22T1 25T1 27T1 30T1 33T1 38T1 45T1 50T1 Output Voltage Temperature Coefficient (TA = −40°C to +85°C) Device Suffix: 19T1 22T1 25T1 27T1 30T1 33T1 38T1 45T1 50T1 Operating Current 2 (VOUT = VCE = VSET +0.5 V, Note 5) Off−State Current (VOUT = 5.0 V, VCE = 0 V, TA = −40°C to +85°C, Note 6) Operating Current 1 (VOUT = VCE = VSET x 0.96, fOSC = 180 kHz) Device Suffix: 19T1 22T1 25T1 27T1 30T1 33T1 38T1 45T1 50T1 5. VSET means setting of output voltage. 6. CE pin is integrated with an internal 150 nA pull−up current source. VOUT 1.853 2.145 2.438 2.633 2.925 3.218 3.705 4.3875 4.875 DVOUT − − − − − − − − − − − 100 100 100 100 100 100 150 150 150 7.0 0.6 − − − − − − − − − 15 1.5 1.9 2.2 2.5 2.7 3.0 3.3 3.8 4.5 5.0 1.948 2.255 2.563 2.768 3.075 3.383 3.895 4.6125 5.125 ppm/°C V Symbol Min Typ Max Unit IDD2 IOFF IDD1 mA mA mA − − − − − − − − − 23 27 32 32 37 37 44 53 70 50 60 60 60 60 60 65 75 100 http://onsemi.com 4 NCP1400A 2.1 VOUT, OUTPUT VOLTAGE (V) VOUT, OUTPUT VOLTAGE (V) 3.4 2.0 VIN= 1.5 V 1.9 VIN= 0.9 V 1.8 NCP1400ASN19T1 L = 22 mH TA = 25°C 0 20 40 60 80 100 VIN= 1.2 V 3.2 VIN= 2.0 V 3.0 VIN= 0.9 V 2.8 NCP1400ASN30T1 L = 22 mH TA = 25°C 0 20 40 60 80 100 VIN= 1.2 V VIN= 1.5 V 1.7 2.6 1.6 2.4 IO, OUTPUT CURRENT (mA) IO, OUTPUT CURRENT (mA) Figure 2. NCP1400ASN19T1 Output Voltage vs. Output Current 6.0 VOUT, OUTPUT VOLTAGE (V) 100 Figure 3. NCP1400ASN30T1 Output Voltage vs. Output Current 5.5 VIN= 3.0 V 5.0 VIN= 0.9 V 4.5 NCP1400ASN50T1 L = 22 mH TA = 25°C 0 20 40 60 80 100 VIN= 1.5 V VIN= 2.0 V EFFICIENCY (%) 80 VIN= 1.5 V 60 VIN= 0.9 V 40 NCP1400ASN19T1 L = 22 mH TA = 25°C 0 20 40 60 80 100 VIN= 1.2 V 4.0 20 3.5 0 IO, OUTPUT CURRENT (mA) IO, OUTPUT CURRENT (mA) Figure 4. NCP1400ASN50T1 Output Voltage vs. Output Current 100 VIN= 2.5 V EFFICIENCY (%) EFFICIENCY (%) 80 VIN= 2.0 V 60 VIN= 0.9 V VIN= 1.2 V VIN= 1.5 V 80 100 Figure 5. NCP1400ASN19T1 Efficiency vs. Output Current VIN= 3.0 V VIN= 0.9 V VIN= 1.5 V VIN= 2.0 V 60 40 NCP1400ASN30T1 L = 22 mH TA = 25°C 0 20 40 60 80 100 40 NCP1400ASN50T1 L = 22 mH TA = 25°C 0 20 40 60 80 100 20 20 0 0 IO, OUTPUT CURRENT (mA) IO, OUTPUT CURRENT (mA) Figure 6. NCP1400ASN30T1 Efficiency vs. Output Current Figure 7. NCP1400ASN50T1 Efficiency vs. Output Current http://onsemi.com 5 NCP1400A 80 IDD1, OPERATING CURRENT (mA) 70 60 50 40 30 20 10 0 1.5 2.0 2.5 3.0 3.5 4.0 4.5 5.0 5.5 NCP1400ASNXXT1 L = 10 mH TA = 25°C IDD1, OPERATING CURRENT (mA) 100 80 60 40 NCP1400ASN30T1 VOUT = 3.0 V x 0.96 Open−loop Test −25 0 25 50 75 100 20 0 −50 VOUT, OUTPUT VOLTAGE (V) TA, AMBIENT TEMPERATURE (°C) Figure 8. NCP1400ASNXXT1 Operating Current (IDD1) vs. Output Voltage 100 IDD1, OPERATING CURRENT (mA) VLXLIM, VLX, VOLTAGE LIMIT (V) 1.0 Figure 9. NCP1400ASN30T1 Current Consumption vs. Temperature 80 0.8 60 0.6 40 NCP1400ASN50T1 VOUT = 5.0 V x 0.96 Open−loop Test −25 0 25 50 75 100 0.4 20 0.2 NCP1400ASN19T1 VOUT = 1.9 V x 0.96 0 −50 −25 0 25 50 75 100 0 −50 TA, AMBIENT TEMPERATURE (°C) TA, AMBIENT TEMPERATURE (°C) Figure 10. NCP1400ASN50T1 Current Consumption vs. Temperature 1.0 VLXLIM, VLX, VOLTAGE LIMIT (V) VLXLIM, VLX, VOLTAGE LIMIT (V) 1.0 Figure 11. NCP1400ASN19T1 VLX Voltage Limit vs. Temperature 0.8 0.8 0.6 0.6 0.4 NCP1400ASN30T1 VOUT = 3.0 V x 0.96 0.4 NCP1400ASN50T1 VOUT = 5.0 V x 0.96 0.2 0.2 0 −50 −25 0 25 50 75 100 0 −50 −25 0 25 50 75 100 TA, AMBIENT TEMPERATURE (°C) TA, AMBIENT TEMPERATURE (°C) Figure 12. NCP1400ASN30T1 VLX Voltage Limit vs. Temperature Figure 13. NCP1400ASN50T1 VLX Voltage Limit vs. Temperature http://onsemi.com 6 NCP1400A 3.2 VOUT, OUTPUT VOLTAGE (V) VOUT, OUTPUT VOLTAGE (V) 5.1 3.1 5.0 3.0 4.9 2.9 NCP1400ASN30T1 L = 10 mH IO = 4.0 mA VIN = 1.2 V −25 0 25 50 75 100 4.8 NCP1400ASN50T1 L = 10 mH IO = 4.0 mA VIN = 1.2 V −25 0 25 50 75 100 2.8 4.7 2.7 −50 4.6 −50 TA, AMBIENT TEMPERATURE (°C) TA, AMBIENT TEMPERATURE (°C) Figure 14. NCP1400ASN30T1 Output Voltage vs. Temperature fOSC, OSCILLATOR FREQUENCY (kHz) fOSC, OSCILLATOR FREQUENCY (kHz) 300 250 200 150 100 50 0 −50 NCP1400ASN30T1 VOUT = 3.0 V x 0.96 Open−loop Test −25 0 25 50 75 100 300 250 200 150 100 50 0 −50 Figure 15. NCP1400ASN50T1 Output Voltage vs. Temperature NCP1400ASN50T1 VOUT = 5.0 V x 0.96 Open−loop Test −25 0 25 50 75 100 TA, AMBIENT TEMPERATURE (°C) TA, AMBIENT TEMPERATURE (°C) Figure 16. NCP1400ASN30T1 Oscillator Frequency vs. Temperature 100 DMAX, MAXIMUM DUTY CYCLE (%) DMAX, MAXIMUM DUTY CYCLE (%) 90 80 70 60 50 40 −50 NCP1400ASN30T1 VOUT = 3.0 V x 0.96 Open−loop Test −25 0 25 50 75 100 100 90 80 70 60 50 40 −50 Figure 17. NCP1400ASN50T1 Oscillator Frequency vs. Temperature NCP1400ASN50T1 VOUT = 5.0 V x 0.96 Open−loop Test −25 0 25 50 75 100 TA, AMBIENT TEMPERATURE (°C) TA, AMBIENT TEMPERATURE (°C) Figure 18. NCP1400ASN30T1 Maximum Duty Cycle vs. Temperature Figure 19. NCP1400ASN50T1 Maximum Duty Cycle vs. Temperature http://onsemi.com 7 NCP1400A Vstart, Vhold, STARTUP AND HOLD VOLTAGE (V) Vstart, Vhold, STARTUP AND HOLD VOLTAGE (V) 1.0 Vstart 0.8 1.0 Vstart 0.8 NCP1400ASN50T1 L = 22 mH COUT = 10 mF IO = 0 mA 0.6 0.4 NCP1400ASN30T1 L = 22 mH COUT = 10 mF IO = 0 mA 0.6 0.4 Vhold 0.2 0.2 Vhold 0.0 −50 −25 0 25 50 75 100 0.0 −50 −25 0 25 50 75 100 TA, AMBIENT TEMPERATURE (°C) TA, AMBIENT TEMPERATURE (°C) Figure 20. NCP1400ASN30T1 Startup/Hold Voltage vs. Temperature ILX, LX PIN ON−STATE CURRENT (mA) ILX, LX PIN ON−STATE CURRENT (mA) 200 260 Figure 21. NCP1400ASN50T1 Startup/Hold Voltage vs. Temperature 160 220 120 180 80 NCP1400ASN30T1 VLX = 0.4 V 40 −50 −25 0 25 50 75 100 140 NCP1400ASN50T1 VLX = 0.4 V 100 −50 −25 0 25 50 75 100 TA, AMBIENT TEMPERATURE (°C) TA, AMBIENT TEMPERATURE (°C) Figure 22. NCP1400ASN30T1 LX Pin On−State Current vs. Temperature ILX, LX PIN ON−STATE CURRENT (mA) 180 160 140 120 100 80 60 1.5 NCP1400ASNXXT1 VLX = 0.4 V TA = 25°C RDS(on), LX SWITCH ON−RESISTANCE (W) 5.0 Figure 23. NCP1400ASN50T1 LX Pin On−State Current vs. Temperature 4.0 3.0 2.0 NCP1400ASNXXT1 VLX = 0.4 V TA = 25°C 2.0 2.5 3.0 3.5 4.0 4.5 5.0 5.5 1.0 0 1.5 2.0 2.5 3.0 3.5 4.0 4.5 5.0 5.5 VOUT, OUTPUT VOLTAGE (V) VOUT, OUTPUT VOLTAGE (V) Figure 24. NCP1400ASNXXT1 LX Pin On−State Current vs. Output Voltage Figure 25. NCP1400ASNXXT1 LX Switch On−Resistance vs. Output Voltage http://onsemi.com 8 NCP1400A Vstart/Vhold, STARTUP/HOLD VOLTAGE (V) Vstart/Vhold, STARTUP/HOLD VOLTAGE (V) 1.6 1.4 1.2 1.0 0.8 0.6 0.4 0.2 0 0 5.0 10 15 20 25 30 IO, OUTPUT CURRENT (mA) Vhold NCP1400ASN19T1 L = 22 mH COUT = 68 mF TA = 25°C Vstart 1.6 1.4 1.2 1.0 0.8 0.6 0.4 0.2 0 0 5.0 10 15 NCP1400ASN30T1 L = 22 mH COUT = 68 mF TA = 25°C 20 25 30 Vstart Vhold IO, OUTPUT CURRENT (mA) Figure 26. NCP1400ASN19T1 Operation Startup/Hold Voltage vs. Output Current Vstart/Vhold, STARTUP/HOLD VOLTAGE (V) 1.6 1.4 Vstart 1.2 1.0 0.8 0.6 0.4 0.2 0 0 5.0 10 15 NCP1400ASN50T1 L = 22 mH COUT = 68 mF TA = 25°C 20 25 30 Vhold Vripple, RIPPLE VOLTAGE (mV) 80.0 Figure 27. NCP1400ASN30T1 Operation Startup/Hold Voltage vs. Output Current 60.0 NCP1400ASN19T1 L = 22 mH COUT = 68 mF TA = 25°C 40.0 VIN= 1.2 V VIN= 1.5 V 20.0 VIN= 0.9 V 0 0 20 40 60 80 100 IO, OUTPUT CURRENT (mA) IO, OUTPUT CURRENT (mA) Figure 28. NCP1400ASN50T1 Operation Startup/Hold Voltage vs. Output Current 80 Vripple, RIPPLE VOLTAGE (mV) Vripple, RIPPLE VOLTAGE (mV) VIN= 2.0 V 60 VIN= 1.5 V 80 Figure 29. NCP1400ASN19T1 Ripple Voltage vs. Output Current 60 NCP1400ASN50T1 L = 22 mH COUT = 68 mF TA = 25°C VIN= 0.9 V VIN= 2.0 V 40 VIN= 1.5 V NCP1400ASN30T1 L = 22 mH COUT = 68 mF TA = 25°C 40 60 80 100 40 VIN= 1.5 V 20 VIN= 3.0 V VIN= 0.9 V 20 0 0 20 0 0 20 40 60 80 100 IO, OUTPUT CURRENT (mA) IO, OUTPUT CURRENT (mA) Figure 30. NCP1400ASN30T1 Ripple Voltage vs. Output Current Figure 31. NCP1400ASN50T1 Ripple Voltage vs. Output Current http://onsemi.com 9 NCP1400A 2 ms/div VOUT = 3.0 V, VIN = 1.2 V, IO = 10 mA., L = 22 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 = 25 mA., L = 22 mH, COUT = 68 mF 1. VLX, 2.0 V/div 2. VOUT, 20 mV/div, AC coupled 3. IL, 100 mA/div Figure 32. Operating Waveforms (Medium Load) Figure 33. Operating Waveforms (Heavy Load) VIN = 1.2 V, L = 22 mH 1. VOUT = 1.9 V (AC coupled), 50 mV/div 2. IO = 3.0 mA to 30 mA VIN = 1.2 V, L = 22 mH 1. VOUT = 1.9 V (AC coupled), 50 mV/div 2. IO = 30 mA to 3.0 mA Figure 34. NCP1400ASN19T1 Load Transient Response Figure 35. NCP1400ASN19T1 Load Transient Response VIN = 1.5 V, L = 22 mH 1. VOUT = 3.0 V (AC coupled), 50 mV/div 2. IO = 3.0 mA to 30 mA VIN = 1.5 V, L = 22 mH 1. VOUT = 3.0 V (AC coupled), 50 mV/div 2. IO = 30 mA to 3.0 mA Figure 36. NCP1400ASN30T1 Load Transient Response http://onsemi.com 10 Figure 37. NCP1400ASN30T1 Load Transient Response NCP1400A VIN = 1.5 V, L = 22 mH 1. VOUT = 5.0 V (AC coupled), 50 mV/div 2. IO = 3.0 mA to 30 mA VIN = 1.5 V, L = 22 mH 1. VOUT = 5.0 V (AC coupled), 50 mV/div 2. IO = 30 mA to 3.0 mA Figure 38. NCP1400ASN50T1 Load Transient Response Figure 39. NCP1400ASN50T1 Load Transient Response OUT 2 ERROR AMP VLX LIMITER LX 5 + − NC 3 DRIVER POWER SWITCH PHASE COMPENSATION PWM CONTROLLER VOLTAGE REFERENCE GND 4 SOFT−START 180 kHz OSCILLATOR 1 CE Figure 40. Representative Block Diagram PIN FUNCTION DESCRIPTION ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ Á Á ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ Á Á Á Á Á ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ Á Á ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ Á Á ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ Á ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ ÁÁÁÁÁÁÁÁÁÁ Á ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ Á Á Á Á ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ ÁÁÁÁÁÁÁÁÁÁ ÁÁ ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ Á Á ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ Á Á ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ ÁÁÁÁÁÁÁÁÁ 1 CE Chip Enable Pin (1) The chip is enabled if a voltage equal to or greater than 0.9 V is applied. (2) The chip is disabled if a voltage less than 0.3 V is applied. (3) The chip is enabled if this pin is left floating. Output voltage monitor pin and also the power supply pin for the device. No internal connection to this pin. Ground pin. 2 3 4 5 OUT NC GND LX External inductor connection pin to power switch drain. Pin # Symbol Pin Description http://onsemi.com 11 NCP1400A DETAILED OPERATING DESCRIPTION Operation Compensation The NCP1400A series are monolithic power switching regulators optimized for applications where power drain must be minimized. These devices operate as fixed frequency, voltage mode boost regulator and is designed to operate in the discontinuous conduction mode. Potential applications include low powered consumer products and battery powered portable products. The NCP1400A series are low noise fixed frequency voltage−mode PWM DC−DC converters, and consist of soft−start circuit, feedback resistor, reference voltage, oscillator, loop compensation network, PWM control circuit, current limit circuit and power switch. Due to the on−chip feedback resistor and loop compensation network, the system designer can get the regulated output voltage from 1.8 V to 5.0 V with a small number of external components. The quiescent current is typically 32 mA (VOUT = 2.7 V), and can be further reduced to about 1.5 mA when the chip is disabled (VCE t 0.3 V). Soft Start The device is designed to operate in discontinuous conduction mode. An internal compensation circuit was designed to guarantee stability over the full input/output voltage and full output load range. Stability cannot be guaranteed in continuous conduction mode. Current Limit The NCP1400A 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 PWM controller block to terminate the output switch conduction. The current limit threshold is typically set at 350 mA. Enable/Disable Operation There is a soft start circuit in NCP1400A. 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. Oscillator The oscillator frequency is internally set to 180 kHz at an accuracy of "20% and with low temperature coefficient of 0.11%/°C. Figures 16 and 17 illustrate oscillator frequency versus temperature. Regulated Converter Voltage (VOUT) The VOUT is set by an internal feedback resistor network. This is trimmed to a selected voltage from 1.8 V to 5.0 V range in 100 mV steps with an accuracy of "2.5%. Note: When the duty cycle is less than about 12%, the regulator will skip switching cycles to maintain high efficiency at light loads. The regulated output will be raised by 3 to 4% under this condition. The NCP1400A series offer IC shutdown mode by chip enable pin (CE pin) to reduce current consumption. An internal 150 nA pull−up current source 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 to 0.9 V to pin CE as this voltage will place the IC into an undefined state and the IC may drain excessive current from the supply. http://onsemi.com 12 NCP1400A APPLICATION CIRCUIT INFORMATION L1 VIN C1 10 mF CE 1 OUT 2 NC 3 22 mH NCP1400A D1 VOUT LX 5 C2 68 mF GND 4 Figure 41. Typical Step−Up Converter Application Step−up Converter Design Equations Diode General step−up DC−DC converter designed to operate in discontinuous conduction mode can be defined by: Calculation D Equation t on T IPK IO V int on L (V in) 2(t on) 2f 2L(V out ) V F * V in) D − Duty cycle IPK − Peak inductor current IO − Desired dc output current VIN − Nominal operating dc input voltage VOUT − Desired dc output voltage VF − Diode forward voltage Assume saturation voltage of the internal FET switch is negligible. External Component Selection Inductor The diode is the largest 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 t 0.3 V Small reverse leakage current Fast reverse recovery time/switching speed Rated current larger than peak inductor current, Irated u IPK Reverse voltage larger than output voltage, Vreverse u VOUT Input Capacitor ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ Á Á ÁÁÁÁÁÁÁÁÁÁÁÁ Á Á Á Á ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ Á ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ Á ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ Á ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ ÁÁÁÁÁÁ Inductance values between 18 mH and 27 mH are the best suitable values for NCP1400A. In general, smaller inductance values can provide larger peak inductor current and output current capability, and lower conversion efficiency, and vice versa. Select an inductor with smallest possible DCR, usually less than 1.0 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. The inductor selected should be able to handle the worst case peak inductor current without saturation. 13 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 Equivalent Series Resistance (ESR) Tantalum or ceramic capacitor with value of 10 mF should be suitable. 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 mF to 68 mF low ESR (0.15 W to 0.30 W) Tantalum capacitor should be appropriate. http://onsemi.com NCP1400A An evaluation board of NCP1400A has been made in the small size of 23 mm x 20 mm and is shown in Figures 42 and 43. 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 1 23 mm Figure 42. NCP1400A PWM Step−up DC−DC Converter Evaluation Board Silkscreen 20 mm 23 mm Figure 43. NCP1400A PWM Step−up DC−DC Converter Evaluation Board Artwork (Component Side) http://onsemi.com 14 NCP1400A Components Supplier Parts Inductor, L1 Supplier Sumida Electric Co. Ltd. Part Number CR54−220MC MBR0520LT1 Description Inductor 22 mH/1.11 A Phone (852) 2880−6688 (852) 2689−0088 (852) 2305−1168 (852) 2305−1168 Á Á Á Á Á ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ Á Á Á Á Á Á Á Á ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ Á Á ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ ÁÁÁÁÁ Á Á Á Á ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ Á ÁÁÁÁÁÁ Á Á Á Á ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ Á Á Á ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ Á Á Á Á ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ Á Á Á Schottky Diode, D1 ON Semiconductor Corp. Schottky Power Rectifier Output Capacitor, C2 Input Capacitor, C1 KEMET Electronics Corp. KEMET Electronics Corp. T494D686K010AS T491C106K016AS Low ESR Tantalum Capacitor 68 mF/10 V Low Profile Tantalum Capacitor 10 mF/16 V 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 44, 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. TP2 VOUT C2 68 mF/10 V TP3 GND JP1 Enable On Off D1 MBR0520LT1 L1 22 mH TP1 VIN CE 1 OUT 2 NC 3 NCP1400A U1 LX 5 C1 10 mF/16 V TP4 GND GND 4 Figure 44. NCP1400A Evaluation Board Schematic Diagram http://onsemi.com 15 NCP1400A PACKAGE DIMENSIONS THIN SOT23−5 SN SUFFIX CASE 483−01 ISSUE B 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. 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 1.05 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 D 5 1 2 4 3 S B L G A J C 0.05 (0.002) H K M SOLDERING FOOTPRINT* 1.9 0.074 0.95 0.037 2.4 0.094 1.0 0.039 0.7 0.028 SCALE 10:1 mm inches Figure 45. THIN SOT23−5/TSOP−5/SC59−5 *For additional information on our Pb−Free strategy and soldering details, please download the ON Semiconductor Soldering and Mounting Techniques Reference Manual, SOLDERRM/D. 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. http://onsemi.com 16 NCP1400A/D