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http://www.belling.com.cn - 1- 9/18/2006 total 13 pages high efficiency, low supply current, multi-funtion step-up dc/dc controlle r BL8530C selection guide o BL8530C -- xx x xx outline o the BL8530C series are cmos-based pfm step-up dc-dc controller with low supply current and high output voltage accuracy. quiescent current drawn from power source is as low as 6ua. it is capable of delivering 500ma output current at 4.0v output with 2v input voltage. only four external components are necessary: an inductor, a schottky diode, an output filter capacitor and a nmosfet or a npn transistor all of these features make BL8530C series be suitable for the portable devices, which are supplied by a single battery to four-cell batteries. BL8530C has a drive pin (ext) fo r external transistor. so it is possible to load a large output current with a power transisto r which has a low saturation voltage. BL8530C integrates stable reference circuits and trimming technology, so it can afford high precision and low temperature-drift coefficient of the output voltage. BL8530C is available in sot-23-3 and sot-23-5 packages which are pb free. and in sot-23-5 the device can be switch on or of f easily by ce pin, to minimize the standby supply current. features o ? deliver 500ma at 4.0v output voltage with 2v input voltage ? the converter output voltage can be adjusted from 2.5v ?? 6.0v(in 0.1v step) ? output voltage accuracy ----------- 2 ? ? low temperature-drift coefficient of the output voltage------------------ 100ppm/ ?? ? only four external components are necessary: an inductor, a schottky diode, an output filter capacitor and a nmosfet or a npn transistor ? high power conversion efficiency---90 ? ? low quiescent current drawn from power source----------------------------------------- 6ua ? small package ----- sot-23-3 ? sot-23-5 applications o ? power source for pda ? dsc ? mp3 player ? electronic toy and wireless mouse ? power source for a single or dual-cell battery-powered equipments ? power source for led pin configurarion o function description o 1 o without enable circuit 2 o with enable circuit output voltage o 25 ?-?- 2.5v 30 ?-?- 3.0v ?-?- 60 ?-?- 6.0v (in 0.1 v step) package type o rn o sot-23-5 rm o sot-23-3
http://www.belling.com.cn - 2- 9/18/2006 total 13 pages BL8530C pin description: pin no. sot-23-3 sot-23-5 symbol description 1 4 vss ? gnd ? ground pin 2 2 vout output pin, power supply for internal circuits 3 5 ext switching pin - 3 nc - - 1 ce chip enable pin (active high) block diagram o fig 1 absolute maximum ratings input voltage range-----------------------------------------------------------------------------------0.3v~12v input voltage: v(ext)--------------------------------------------------------------------------------0.3v~(vout+0.3) ce pin voltage -----------------------------------------------------------------------------------------0.3v~(vout+0.3) ext pin output current -----------------------------------------------------------------------------0.7a maximum power dissipation, pd t=25 c sot-23-5---------------------------------------------------------------------------------------0.25w sot-23-3---------------------------------------------------------------------------------------0.15w maximum junction temperature ------------------------------------------------------------------150 c operating free-air temperature range ---------------------------------------------------------- -20~+80 c storage temperature range ----------------------------------------------------------------------- -40~125 c lead temperature and time -----------------------------------------------------------------------260 c,10s recommended operating conditions min nom max unit input voltage range 0.8 vout v inductor 10 27 100 h input capacitor 0 ?y 10 f output capacitor 47 100 220 f
http://www.belling.com.cn - 3- 9/18/2006 total 13 pages BL8530C vout pin filter capacitor 1 nf operating junction temperature -20 85 ?? *suggestion o use tantalum type capacitor to reduce the rippl e of the output voltage. use 1nf filter ceramic type capacitor to connect vout pin and gnd pin. the filt er capacitor is recommended as close as possible to vout pin and gnd pin. electrical characteristics default condition(unless otherwise provided): vin=0.6 ? vout, iout=10ma, temperature=25 ?? , use external circuit in test circuit list reference data symbol item test conditions min typ. max unit 2.45 2.5 2.55 2.646 2.7 2.754 2.94 3.0 3.06 3.234 3.3 3.366 3.528 3.6 3.672 3.92 4.0 4.08 4.9 5.0 5.1 vout output voltage 5.88 6.0 6.12 v vin input voltage 12 v iin input current * (no load) iout=0ma ? vin = vout*0.6 20 25 ua i dd quiescent current * no external component, vout =vout1.05 6 8 ua i standby chip leakage current v ce =0v 1 ua v ceh ce ?h? threshold voltage v ce o 0 2v 0.6 0.9 v v cel ce ?l? threshold voltage v ce o 2 0v 0.3 0.6 v fosc oscillator frequency vout=vout*0.96 test ext pin frequency 300 350 400 khz i ceh ce ?h? vout=v ce =6v -0.5 0 0.5 ua i cel ce ?l? vout=v ce =6v -0.5 0 0.5 ua 3.0v<=vout<=3.9v -21 ma 4.0v<=vout<=4.9v -35 ma i exth ext?h? output current 5.0v<=vout<=6.9v -41 ma 3.0v<=vout<=3.9v 23 ma 4.0v<=vout<=4.9v 25 ma i extl ext?h? output current 5.0v<=vout<=6.9v 31 ma duty oscillator duty cycle on ? vlx ? l ? ? side 70 75 80 ? efficiency 90 ? note o 1 ? diode o schottky type, such as o 1n5817, 1n5819, 1n5822 2 ? inductor o 27uh(r<0.5 ? ) 3 ? output capacitor o 100uf(tantalum type) 4 ? vout pin filter capacitor: 1nf(ceramic type) 5 ? input capacitor: 47uf
http://www.belling.com.cn - 4- 9/18/2006 total 13 pages BL8530C typical applications o (1) application with external nmosfet fig 2 (2) application with external npn transistor fig 3 note: r 1 =330 ? , c 1 =10nf. (r 1 can be calculated by load. if load is light r 1 ?s value can be added. if load is heavy r 1 ?s value can be smaller. ) detailed description the BL8530C series are boost structure, voltage-type pulse-frequency modulation(pfm) step-up dc-dc controller. only four external components are necessary: an inductor, a schottky diode, an output filter capacitor and a nmosfet or a npn transistor. the step-up dc-dc converter, constructed by BL8530C, can be adjusted from 2.5v to 6.0v, 0.1v step. by using the depletion technics, the quiescent current drawn from power source is lower than 8ua. the high efficiency device consists of resistors for output voltage detection and trimming, a start-up voltage circuit, an oscillator, a reference circuit, a pfm control circuit, a switch protection circuit and a driver transistor. BL8530C integrates pfm control system. this system controls fixed power switch on duty cycle frequency to stabilize output voltage by calculating results of other blocks which sense input voltage, output voltage, output current and load conditions. in pfm modulation system, the frequency and pulse width is fixed. the duty cycle is adjusted by ski pping pulses, so that switch on-time is changed based on the conditions such as input voltage, output current and load. the oscillate block inside BL8530C provides fixed frequency and pulse width wave. the reference circuit provides stable reference voltage to output stable output voltage. because internal trimming technology is used, the chip output change less than 2%. at the same time ? the problem of temperature-drift coefficient of output voltage is considered in design, so temperature-drift coefficient of output voltage is less than 100ppm/ ??? high-gain differential error amplifier guarantees stable output voltage at difference input voltage and load. in order to reduce ripple and noise, the error amplifier is designed with high band-with.
http://www.belling.com.cn - 5- 9/18/2006 total 13 pages BL8530C BL8530C has a drive pin (ext) for external transistor. so it is possible to load a large output current with a power transistor and a low saturation voltage. at very light load condition, the switch current and quiescent current of chip will effect efficiency certainly. so in very light load condition, the efficiency will drop. therefore, it is recommended that user use BL8530C in the condition of load current as large as several tens of ma to several hundreds of ma. selection of the external components thus it can be seen, the inductor, schottky diode and external nmosfet or npn transistor. affect the conversion efficiency greatly. the inductor and the capacitor also have great influence on the output voltage ripple of the converter. so it is necessary to choose a suitable inductor, a capacitor, an external nmosfet or npn transistor and a right schottky diode, to obtain high efficiency and low ripple. before discussion ? we define vout vin vout d ? . ? 1 ? inductor selection above all, we should define the minimum value of the inductor that can ensure the boost dc-dc to operate in the continuous current-mode condition. f r d d l l 2 ) 1 ( min 2 ? the above expression is got under conditions of continuous current mode, neglect schottky diode?s voltage, esr of both inductor and capacitor. the actual value is greater that it. if inductor?s value is less than lmin ? the efficiency of dc-dc converter will drop greatly, and the dc-dc circuit will not be stable. secondly, consider the ripple of the output voltage, lf vin d i ? = ? lf dvin r d vin ax l 2 ) 1 ( im 2 + ? = if inductor value is too small, the current ripple through it will be great. then the current through diode and power switch will be great. because the power switch on chip is not ideal switch, the energy of switch will improve. the efficiency will fall. thirdly ? in general, smaller inductor values supply more output current while larger values start up with lower input voltage and acquire high efficiency. an inductor value of 3uh to 1mh works well in most applications. if dc-dc converter delivers large output current (for example: output current is great than 50ma), large inductor value is recommended in order to improve efficiency. if dc-dc must output very large current at low input supply voltage, small inductor value is recommended. the esr of inductor will effect efficiency greatly. suppose esr value of inductor is r l ? r load is load resistor ? then the energy can be calculated by following expression o 2 ) 1 ( d r r load l ? ? for example: input 1.5v, output is 3.0v, r load =20 ? , r l =0.5 ? , the energy loss is 10%. consider all above ? inductor value of 47uh ? esr<0.5 ? is recommended in most applications. large value is recommended in high efficiency applications and smaller value is recommended ? 2 ? output capacitor selection ignore esr of capacitor ? the ripple of output voltage is:
http://www.belling.com.cn - 6- 9/18/2006 total 13 pages BL8530C cf r d vout vout r load = ? = so large value capacitor is needed to reduce ripple. but too large capacitor value will slow down system reaction and cost will improve. so 100uf capacitor is recommended. larger capacitor value will be used in large output current system. if output current is small (<10ma), small value is needed. consider esr of capacitor ? ripple will increase o vout r ax r r esr ? + = im ' when current is large, ripple caused by esr will be main factor. it may be greater than 100mv ? the esr will affects efficiency and increase energy loss. so low-esr capacitor (for example: tantalum capacitor) is recommend or connect two or more filter capacitors in parallel. ? 3 ? diode selection rectifier diode will affects efficiency greatly ? though a common diode (such as 1n4148) will work well for light load ? it will reduce about 5%~10% efficiency for heavy load ? for optimum performance, a schottky diode (such as 1n5817 ? 1n5819 ? 1n5822) is recommended. ? 4 ? input capacitor if supply voltage is stable, the dc-dc circuit can output low ripple, low noise and stable voltage without input capacitor. if voltage source is far away from dc-dc circuit, input capacitor value greater than 10uf is recommended. ? 5 ? vout~gnd filter capacitor because the chip?s switch current flows from vout pin, then through the chip into gnd pin. therefore if the output capacitor?s two pins were not very near the chip?s vout pin and gnd pin, vout ?s stable would be affected. user will found that the output voltage will drop when load grows up if the output capacitor?s two pin is not very near the chip?s vout pin and gnd pin. in this condition, 1nf ceramic capacitor is recommended at very near the chip?s vout pin and gnd pin. so in all BL8530C application, two capacitors are needed to obtain stable output voltage. the 100f tantalum output capacitor is recommended to stable output voltage nearby load. the 1nf vout pin to gnd pin ceramic filter capacitor is recommended to stable chip?s sense voltage. test circuits o ? 1 ? output voltage test circuit fig 4 ? 2 ? quiescent current test circuit
http://www.belling.com.cn - 7- 9/18/2006 total 13 pages BL8530C fig 5 ? 3 ? input current (no load) test circuit fig 6 ? 4 ? oscillator frequency and duty cycle test circuit fig 7 extend applications o (1) 12v step-up application fig 8
http://www.belling.com.cn - 8- 9/18/2006 total 13 pages BL8530C note: BL8530C?s output voltage is 6v. when the output current is small or no load, the output voltage will be unstable, use the r zd for flowing the bias current through the zener diode. for step-up application, a diode(for example: 1n4148) is needed as starter circuit. (2) step-down application fig 9 note: in step-down application, use starter circuit as above. 2.5v ? vzener ? vout. r st is needed for bias current of zener diode. this starter circuit also can be used in high voltage step-up application. (3) flyback step-up/step-down application fig 10 note: in step-down and step-up/step-down application, starter circuit in fig 8 is need. in step-up application, simpler starter circuit in fig 9 can be used.
http://www.belling.com.cn - 9- 9/18/2006 total 13 pages BL8530C typical characteristic o (recommended operating conditions: l=10uh, cin=47uf, cout=100uf, t opt =25 c. unless otherwise noted) BL8530C-302rn output voltage vs. output current 2.840 2.860 2.880 2.900 2.920 2.940 2.960 2.980 3.000 10 100 1000 iout(ma) vout(v) vin=1.5v vin=2v vin=2.5v BL8530C-402rn output voltage vs. output current 3.550 3.650 3.750 3.850 3.950 4.050 10 100 1000 iout(ma) vout(v) vin=1.5v vin=2.0v vin=2.5v vin=3.0v BL8530C-602rn output voltage vs. output current 5.300 5.400 5.500 5.600 5.700 5.800 5.900 6.000 6.100 10 100 1000 iout(ma) vout(v) vin=1.5v vin=2.0v vin=3.0v BL8530C-302rn efficiency vs. output current 30.00 40.00 50.00 60.00 70.00 80.00 90.00 100.00 10 100 1000 iout(ma) efficiency(%) vin=1.5v vin=2.0v vin=2.5v BL8530C-402rn efficiency vs. output current 78.00 80.00 82.00 84.00 86.00 88.00 90.00 92.00 94.00 96.00 10 100 1000 iout(ma) efficiency(%) vin=1.5v vin=2.0v vin=2.5v vin=3.0v BL8530C-602rn efficiency vs. output current 82.00 84.00 86.00 88.00 90.00 92.00 94.00 96.00 98.00 10 100 1000 iout(ma) efficiency(%) vin=1.5v vin=2.0v vin=3.0v 1.output voltage vs. output current 2.output voltage vs. output current 3.output voltage vs. output current 4.efficiency vs. output current 5.efficiency vs. output current 6.efficiency vs. output current
http://www.belling.com.cn - 10- 9/18/2006 total 13 pages BL8530C BL8530C-302rn ripple vs. output current 0 50 100 150 200 250 10 100 1000 iout(ma) vripple(mv) vin=1.5v vin=2.0v vin=2.5v BL8530C-402 ripple vs. output current 0 50 100 150 200 250 10 100 1000 iout(ma) vripple(mv) vin=1.5v vin=2.0v vin=2.5v vin=3.0v BL8530C-602rn ripple vs. output current 0 50 100 150 200 250 300 10 100 1000 iout(ma) vripple(mv) vin=1.5v vin=2.0v vin=3.0v 7.ripple vs. output current 8.ripple vs. output current 9.ripple vs. output current
http://www.belling.com.cn - 11- 9/18/2006 total 13 pages BL8530C package information o sot-23-3: package sot-23-3 devices per reel 3000 unit mm package dimension o taping specification o
http://www.belling.com.cn - 12- 9/18/2006 total 13 pages BL8530C taping reel dimension o sot-23-5: package sot-23-5 devices per reel 3000 unit mm package specification o
http://www.belling.com.cn - 13- 9/18/2006 total 13 pages BL8530C taping dimension o? m1 o standard type ? m2 o customized ? taping reel dimension o

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