View NCP1400A_5880566.PDF datasheet online --- IC-ON-LINE

Datasheet File OCR Text:

? semiconductor components industries, llc, 2004 october, 2004 ? rev. 10 1 publication order number: NCP1400A/d 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 startup 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 ? extremely low startup 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 typical applications ? cellular telephones ? pagers ? personal digital assistants ? electronic games ? digital cameras ? camcorders ? handheld instruments ? white led torch light thin sot23?5 sn suffix case 483 1 5 pin connections and marking diagram 1 3 gnd ce 2 out nc 4 lx 5 xxxyw (top view) xxx = marking y = year w = work week see detailed ordering and shipping information in the ordering information section on page 2 of this data sheet. ordering information http://onsemi.com 1 3 gnd ce 2 out nc 4 lx 5 NCP1400A v out v in figure 1. typical step?up converter application
NCP1400A http://onsemi.com 2 ordering information device output voltage switching frequency marking package shipping 2 NCP1400Asn19t1 1.9 v dai thin sot23?5 NCP1400Asn19t1g 1.9 v dai thin sot23?5 (pb?free) NCP1400Asn22t1 2.2 v dcn thin sot23?5 NCP1400Asn22t1g 2.2 v dcn thin sot23?5 (pb?free) NCP1400Asn25t1 2.5 v dav thin sot23?5 NCP1400Asn25t1g 2.5 v dav thin sot23?5 (pb?free) NCP1400Asn27t1 2.7 v daa NCP1400Asn30t1 3.0 v 180 khz dab thin sot23 5 3000 / tape & reel ( 7 inch reel ) NCP1400Asn33t1 3.3 v daj thin sot23?5 (7 inch reel) NCP1400Asn38t1 3.8 v dbk NCP1400Asn38t1g 3.8 v dbk thin sot23?5 (pb?free) NCP1400Asn45t1 4.5 v dbl thin sot23?5 NCP1400Asn45t1g 4.5 v dbl thin sot23?5 (pb?free) NCP1400Asn50t1 5.0 v dad thin sot23?5 NCP1400Asn50t1g 5.0 v dad thin sot23?5 (pb?free) note: the ordering information lists seven standard output voltage device options. additional devices with output voltage rangin g from 1.8 v to 5.0 v in 100 mv increments can be manufactured. contact your on semiconductor representative for availability. 2for 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 symbol value unit power supply voltage (pin 2) v out -0.3 to 6.0 v input/output pins lx (pin 5) lx peak sink current v lx i lx ?0.3 to 6.0 400 v ma ce (pin 1) input voltage range input current range v ce i ce ?0.3 to 6.0 ?150 to 150 v ma thermal resistance junction to air r ja 250 c/w operating ambient temperature range (note 2) t a -40 to +85 c operating junction temperature range t j -40 to +125 c storage temperature range t stg -55 to +150 c maximum ratings are those values beyond which device damage can occur. maximum ratings applied to the device are individual str ess limit values (not normal operating conditions) and are not valid simultaneously. if these limits are exceeded, device functional operation i s 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. p d t j(max) t a r ja 3. latchup current maximum rating: 150 ma per jedec standard: jesd78. 4. moisture sensitivity level (msl): 1 per ipc/jedec standard: j?std?020a.
NCP1400A http://onsemi.com 3 electrical characteristics (for all values t a = 25 c, unless otherwise noted.) characteristic symbol min typ max unit oscillator frequency (v out = v set x 0.96, note 5) f osc 144 180 216 khz frequency temperature coefficient (t a = ?40 c to 85 c) f ? 0.11 ? %/ c maximum pwm duty cycle (v out = v set x 0.96) d max 68 75 82 % minimum startup voltage (i o = 0 ma) v start ? 0.8 0.95 v minimum startup voltage temperature coefficient (t a = ?40 c to 85 c) v start ? ?1.6 ? mv/ c minimum operation hold voltage (i o = 0 ma) v hold 0.3 ? ? v soft?start time (v out 0.8 v) t ss 0.5 2.0 ? ms lx (pin 5) lx pin on?state sink current (v lx = 0.4 v) device suffix: 19t1 22t1 25t1 27t1 30t1 33t1 38t1 45t1 50t1 i lx 80 80 80 100 100 100 100 100 100 90 90 120 125 130 135 145 155 160 ? ? ? ? ? ? ? ? ? ma voltage limit (v out = v ce = v set x 0.96, v lx al'' side) v lxlim 0.65 0.8 1.0 v off?state leakage current (v lx = 5.0 v, t a = ?40 c to 85 c) i lkg ? 0.5 1.0 a ce (pin 1) ce input voltage (v out = v set x 0.96) high state, device enabled low state, device disabled v ce(high) v ce(low) 0.9 ? ? ? ? 0.3 v ce input current (note 6) high state, device enabled (v out = v ce = 5.0 v) low state, device disabled (v out = 5.0 v, v ce = 0 v) i ce(high) i ce(low) ?0.5 ?0.5 0 0.15 0.5 0.5 a 5. v set means setting of output voltage. 6. ce pin is integrated with an internal 150 na pullup current source.
NCP1400A http://onsemi.com 4 electrical characteristics (continued) (for all values t a = 25 c, unless otherwise noted.) characteristic unit max typ min symbol total device output voltage (v in = 0.7 x v out , i o = 10 ma) device suffix: 19t1 22t1 25t1 27t1 30t1 33t1 38t1 45t1 50t1 v out 1.853 2.145 2.438 2.633 2.925 3.218 3.705 4.3875 4.875 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 v output voltage temperature coefficient (t a = ?40 c to +85 c) device suffix: 19t1 22t1 25t1 27t1 30t1 33t1 38t1 45t1 50t1 v out ? ? ? ? ? ? ? ? ? 100 100 100 100 100 100 150 150 150 ? ? ? ? ? ? ? ? ? ppm/ c operating current 2 (v out = v ce = v set +0.5 v, note 5) i dd2 ? 7.0 15 a off?state current (v out = 5.0 v, v ce = 0 v, t a = ?40 c to +85 c, note 6) i off ? 0.6 1.5 a operating current 1 (v out = v ce = v set x 0.96, f osc = 180 khz) device suffix: 19t1 22t1 25t1 27t1 30t1 33t1 38t1 45t1 50t1 i dd1 ? ? ? ? ? ? ? ? ? 23 27 32 32 37 37 44 53 70 50 60 60 60 60 60 65 75 100 a 5. v set means setting of output voltage. 6. ce pin is integrated with an internal 150 na pullup current source.
NCP1400A http://onsemi.com 5 100 60 80 40 20 0 20 0 40 60 80 100 3.0 3.2 2.6 2.8 2.4 3.4 60 0 2.0 100 1.9 40 20 i o , output current (ma) v out , output voltage (v) 1.8 i o , output current (ma) figure 2. NCP1400Asn19t1 output voltage vs. output current figure 3. NCP1400Asn30t1 output voltage vs. output current v out , output voltage (v) 0 6.0 5.5 5.0 80 60 40 4.5 4.0 3.5 20 100 figure 4. NCP1400Asn50t1 output voltage vs. output current i o , output current (ma) figure 5. NCP1400Asn19t1 efficiency vs. output current i o , output current (ma) efficiency (%) v out , output voltage (v) figure 6. NCP1400Asn30t1 efficiency vs. output current i o , output current (ma) figure 7. NCP1400Asn50t1 efficiency vs. output current i o , output current (ma) efficiency (%) efficiency (%) 2.1 060 40 20 80 100 080 60 40 20 100 080 60 40 100 20 20 80 40 0 100 080 60 40 20 100 v in = 1.5 v 1.7 1.6 60 80 v in = 0.9 v v in = 1.2 v v in = 1.5 v v in = 0.9 v v in = 1.2 v v in = 2.0 v v in = 1.5 v v in = 0.9 v v in = 1.2 v v in = 1.5 v v in = 0.9 v v in = 2.0 v v in = 3.0 v v in = 1.2 v v in = 0.9 v v in = 2.0 v v in = 2.5 v v in = 1.5 v v in = 3.0 v v in = 0.9 v v in = 2.0 v v in = 1.5 v NCP1400Asn19t1 l = 22 h t a = 25 c NCP1400Asn30t1 l = 22 h t a = 25 c NCP1400Asn50t1 l = 22 h t a = 25 c NCP1400Asn19t1 l = 22 h t a = 25 c NCP1400Asn50t1 l = 22 h t a = 25 c NCP1400Asn30t1 l = 22 h t a = 25 c
NCP1400A http://onsemi.com 6 1.0 0.8 0.6 0.4 0.2 0 100 80 60 40 20 0 100 80 60 40 20 0 1.0 0.8 0.6 0.4 0.2 0 1.0 0.8 0.6 0.4 0.2 0 1.5 80 70 3.5 60 50 4.0 3.0 2.5 4.5 v out , output voltage (v) i dd1 , operating current ( a) 40 30 20 10 0 2.0 t a , ambient temperature ( c) figure 8. NCP1400Asnxxt1 operating current (i dd1 ) vs. output voltage figure 9. NCP1400Asn30t1 current consumption vs. temperature i dd1 , operating current ( a) figure 10. NCP1400Asn50t1 current consumption vs. temperature t a , ambient temperature ( c) figure 11. NCP1400Asn19t1 v lx voltage limit vs. temperature t a , ambient temperature ( c) v lxlim , v lx , voltage limit (v) i dd1 , operating current ( a) figure 12. NCP1400Asn30t1 v lx voltage limit vs. temperature t a , ambient temperature ( c) figure 13. NCP1400Asn50t1 v lx voltage limit vs. temperature t a , ambient temperature ( c) v lxlim , v lx , voltage limit (v) v lxlim , v lx , voltage limit (v) 5.5 ?50 50 75 25 0 100 ?25 ?50 50 75 25 0 100 ?25 ?50 50 75 25 0 100 ?25 ?50 50 75 25 0 100 ?25 ?50 50 75 25 0 100 ?25 5.0 NCP1400Asnxxt1 l = 10 h t a = 25 c NCP1400Asn30t1 v out = 3.0 v x 0.96 open?loop test NCP1400Asn50t1 v out = 5.0 v x 0.96 open?loop test NCP1400Asn19t1 v out = 1.9 v x 0.96 NCP1400Asn30t1 v out = 3.0 v x 0.96 NCP1400Asn50t1 v out = 5.0 v x 0.96
NCP1400A http://onsemi.com 7 d max , maximum duty cycle (%) 4.8 4.7 4.6 4.9 5.0 5.1 80 70 60 90 100 200 150 100 50 0 250 300 2.9 2.8 2.7 3.0 3.1 3.2 t a , ambient temperature ( c) v out , output voltage (v) t a , ambient temperature ( c) figure 14. NCP1400Asn30t1 output voltage vs. temperature figure 15. NCP1400Asn50t1 output voltage vs. temperature v out , output voltage (v) figure 16. NCP1400Asn30t1 oscillator frequency vs. temperature t a , ambient temperature ( c) figure 17. NCP1400Asn50t1 oscillator frequency vs. temperature t a , ambient temperature ( c) f osc , oscillator frequency (khz) f osc , oscillator frequency (khz) figure 18. NCP1400Asn30t1 maximum duty cycle vs. temperature t a , ambient temperature ( c) figure 19. NCP1400Asn50t1 maximum duty cycle vs. temperature t a , ambient temperature ( c) ?50 50 75 25 0 100 ?25 ?50 50 75 25 0 100 ?25 ?50 50 75 25 0 100 ?25 ?50 50 100 25 0 ?25 200 150 100 50 0 250 300 ?50 50 75 25 010 0 ?25 50 40 75 80 70 60 90 100 ?50 50 100 25 0 ?25 50 40 75 NCP1400Asn30t1 v out = 3.0 v x 0.96 open?loop test NCP1400Asn30t1 l = 10 h i o = 4.0 ma v in = 1.2 v NCP1400Asn50t1 l = 10 h i o = 4.0 ma v in = 1.2 v NCP1400Asn50t1 v out = 5.0 v x 0.96 open?loop test NCP1400Asn50t1 v out = 5.0 v x 0.96 open?loop test NCP1400Asn30t1 v out = 3.0 v x 0.96 open?loop test d max , maximum duty cycle (%)
NCP1400A http://onsemi.com 8 0.6 0.4 0.2 0.8 1.0 0.0 120 80 40 160 200 180 140 100 220 260 t a , ambient temperature ( c) t a , ambient temperature ( c) figure 20. NCP1400Asn30t1 startup/hold voltage vs. temperature figure 21. NCP1400Asn50t1 startup/hold voltage vs. temperature figure 22. NCP1400Asn30t1 lx pin on?state current vs. temperature t a , ambient temperature ( c) figure 23. NCP1400Asn50t1 lx pin on?state current vs. temperature t a , ambient temperature ( c) figure 24. NCP1400Asnxxt1 lx pin on?state current vs. output voltage v out , output voltage (v) ?50 25 050 ?25 75 100 ?50 50 25 0 ?25 75 100 ?50 0 ?25 25 50 75 100 140 120 100 80 160 180 60 i lx , lx pin on?state current (ma) v start , v hold , startup and hold voltage (v) 3.0 2.0 1.0 1.5 3.5 3.0 4.0 4.0 5.0 0 5.5 4.5 5.0 figure 25. NCP1400Asnxxt1 lx switch on?resistance vs. output voltage r ds(on) , lx switch on?resistance ( ) 0.6 0.4 0.2 0.8 1.0 0.0 ?50 25 050 ?25 75 100 2.5 2.0 1.5 3.5 3.0 4.0 5.5 4.5 5.0 2.5 2.0 NCP1400Asn30t1 l = 22 h c out = 10 f i o = 0 ma NCP1400Asn50t1 v lx = 0.4 v NCP1400Asn50t1 l = 22 h c out = 10 f i o = 0 ma NCP1400Asn30t1 v lx = 0.4 v NCP1400Asnxxt1 v lx = 0.4 v t a = 25 c NCP1400Asnxxt1 v lx = 0.4 v t a = 25 c v out , output voltage (v) v start , v hold , startup and hold voltage (v) i lx , lx pin on?state current (ma) i lx , lx pin on?state current (ma) v start v hold v start v hold
NCP1400A http://onsemi.com 9 02025 15 10 5.0 30 80 60 40 20 0 1.6 0.6 0 1.6 1.4 1.2 1.0 0.8 0.6 0 80 60 40 20 0 80.0 60.0 40.0 20.0 0 1.6 1.4 1.2 1.0 i o , output current (ma) v start /v hold , startup/hold voltage (v) 0.8 0.6 0.4 0.2 0 i o , output current (ma) figure 26. NCP1400Asn19t1 operation startup/hold voltage vs. output current figure 27. NCP1400Asn30t1 operation startup/hold voltage vs. output current figure 28. NCP1400Asn50t1 operation startup/hold voltage vs. output current i o , output current (ma) figure 29. NCP1400Asn19t1 ripple voltage vs. output current i o , output current (ma) v ripple , ripple voltage (mv) v start /v hold , startup/hold voltage (v) figure 30. NCP1400Asn30t1 ripple voltage vs. output current i o , output current (ma) figure 31. NCP1400Asn50t1 ripple voltage vs. output current i o , output current (ma) 020 15 10 25 5.0 30 015300 60 40 100 20 0 60 100 20 0 80 60 40 100 20 80 0.4 0.2 1.4 1.0 1.2 0.8 0.4 0.2 5.0 10 20 25 40 80 v start /v hold , startup/hold voltage (v) NCP1400Asn19t1 l = 22 h c out = 68 f t a = 25 c NCP1400Asn30t1 l = 22 h c out = 68 f t a = 25 c NCP1400Asn19t1 l = 22 h c out = 68 f t a = 25 c NCP1400Asn50t1 l = 22 h c out = 68 f t a = 25 c NCP1400Asn30t1 l = 22 h c out = 68 f t a = 25 c NCP1400Asn50t1 l = 22 h c out = 68 f t a = 25 c v start v in = 0.9 v v in = 1.2 v v hold v start v hold v start v hold v in = 1.5 v v in = 0.9 v v in = 3.0 v v in = 1.5 v v in = 2.0 v v in = 0.9 v v in = 1.5 v v in = 1.5 v v in = 2.0 v v ripple , ripple voltage (mv) v ripple , ripple voltage (mv)
NCP1400A http://onsemi.com 10 v out = 3.0 v, v in = 1.2 v, i o = 10 ma., l = 22 h, c out = 68 f 1. v lx , 2.0 v/div 2. v out , 20 mv/div, ac coupled 3. i l , 100 ma/div figure 32. operating waveforms (medium load) 2 s/div v out = 3.0 v, v in = 1.2 v, i o = 25 ma., l = 22 h, c out = 68 f 1. v lx , 2.0 v/div 2. v out , 20 mv/div, ac coupled 3. i l , 100 ma/div figure 33. operating waveforms (heavy load) 2 s/div v in = 1.2 v, l = 22 h 1. v out = 1.9 v (ac coupled), 50 mv/div 2. i o = 3.0 ma to 30 ma figure 34. NCP1400Asn19t1 load transient response v in = 1.2 v, l = 22 h 1. v out = 1.9 v (ac coupled), 50 mv/div 2. i o = 30 ma to 3.0 ma figure 35. NCP1400Asn19t1 load transient response v in = 1.5 v, l = 22 h 1. v out = 3.0 v (ac coupled), 50 mv/div 2. i o = 3.0 ma to 30 ma figure 36. NCP1400Asn30t1 load transient response v in = 1.5 v, l = 22 h 1. v out = 3.0 v (ac coupled), 50 mv/div 2. i o = 30 ma to 3.0 ma figure 37. NCP1400Asn30t1 load transient response
NCP1400A http://onsemi.com 11 v in = 1.5 v, l = 22 h 1. v out = 5.0 v (ac coupled), 50 mv/div 2. i o = 3.0 ma to 30 ma figure 38. NCP1400Asn50t1 load transient response v in = 1.5 v, l = 22 h 1. v out = 5.0 v (ac coupled), 50 mv/div 2. i o = 30 ma to 3.0 ma figure 39. NCP1400Asn50t1 load transient response - + voltage reference phase compensation soft?start pwm controller 180 khz oscillator driver v lx limiter lx 5 power switch 1 ce gnd 4 nc 3 out 2 error amp figure 40. representative block diagram pin function description pin # symbol pin description 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. 2 out output voltage monitor pin and also the power supply pin for the device. 3 nc no internal connection to this pin. 4 gnd ground pin. 5 lx external inductor connection pin to power switch drain.
NCP1400A http://onsemi.com 12 detailed operating description operation 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 a (v out = 2.7 v), and can be further reduced to about 1.5 a when the chip is disabled (v ce 0.3 v). soft?start 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 startup 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 (v out ) the v out 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. compensation 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 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 aon''. 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.
NCP1400A http://onsemi.com 13 application circuit information figure 41. typical step?up converter application 1 3 gnd ce 2 out nc 4 lx 5 NCP1400A v out v in c1 10 f l1 d1 c2 68 f 22 h step?up converter design equations general step?up dc?dc converter designed to operate in discontinuous conduction mode can be defined by: calculation equation d t on t i pk v in t on l i o (v in ) 2 (t on ) 2 f 2l(v out v f v in ) d ? duty cycle i pk ? peak inductor current i o ? desired dc output current v in ? nominal operating dc input voltage v out ? desired dc output voltage v f ? diode forward voltage assume saturation voltage of the internal fet switch is negligible. external component selection inductor inductance values between 18 h and 27 h 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 , 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. diode 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, v f , 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, v f 0.3 v small reverse leakage current fast reverse recovery time/switching speed rated current larger than peak inductor current, i rated i pk reverse voltage larger than output voltage, v reverse v out input capacitor 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 f 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 f to 68 f low esr (0.15 to 0.30 ) tantalum capacitor should be appropriate.
NCP1400A http://onsemi.com 14 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 20 mm 23 mm 23 mm figure 42. NCP1400A pwm step?up dc?dc converter evaluation board silkscreen figure 43. NCP1400A pwm step?up dc?dc converter evaluation board artwork (component side) 1
NCP1400A http://onsemi.com 15 components supplier parts supplier part number description phone inductor, l1 sumida electric co. ltd. cr54-220mc inductor 22 h/1.11 a (852) 2880-6688 schottky diode, d1 on semiconductor corp. mbr0520lt1 schottky power rectifier (852) 2689-0088 output capacitor, c2 kemet electronics corp. t494d686k010as low esr tantalum capacitor 68 f/10 v (852) 2305?1168 input capacitor, c1 kemet electronics corp. t491c106k016as low profile tantalum capacitor 10 f/16 v (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 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 low resistance conducting paths should be used for the power carrying traces to reduce power loss so as to improve 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 the output capacitor should be placed close to the output terminals to obtain better smoothing effect on the output ripple. tp2 tp3 tp1 tp4 v out gnd v in gnd c1 10 f/16 v l1 22 h NCP1400A u1 jp1 enable c2 68 f/10 v on off 1 2 3 5 4 d1 mbr0520lt1 ce out nc gnd lx figure 44. NCP1400A evaluation board schematic diagram
NCP1400A http://onsemi.com 16 package dimensions thin sot23?5 sn suffix case 483?02 issue c 0.7 0.028 1.0 0.039 mm inches scale 10:1 0.95 0.037 2.4 0.094 1.9 0.074 soldering footprint* *for additional information on our pb?free strategy and soldering details, please download the on semiconductor soldering and mounting techniques reference manual, solderrm/d. 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. dim min max min max inches millimeters 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 0.05 (0.002) 123 54 s a g l b d h c k m j __ _ _ on semiconductor and are registered trademarks of semiconductor components industries, llc (scillc). scillc reserves the right to mak e changes without further notice to any products herein. scillc makes no warranty, representation or guarantee regarding the suitability of its products for an y 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 wi thout limitation special, consequential or incidental damages. atypicalo parameters which may be provided in scillc data sheets and/or specifications can and do vary in different application s and actual performance may vary over time. all operating parameters, including atypicalso 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 sit uation 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, af filiates, and distributors harmless against all claims, costs, damages, and expenses, and reasonable attorney fees arising out of, direct ly 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 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 NCP1400A/d literature fulfillment : literature distribution center for on semiconductor p.o. box 61312, phoenix, arizona 85082?1312 usa phone : 480?829?7710 or 800?344?3860 toll free usa/canada fax : 480?829?7709 or 800?344?3867 toll free usa/canada 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.

▲Up To Search▲

Price & Availability of NCP1400A

	To Download NCP1400A Datasheet File
If you can't view the Datasheet, Please click here to try to view without PDF Reader .