www. belling .com .cn 1 +12v, 30ma flash memory programming supply BL8052 description the BL8052 is a regulated +12v, 30ma - output, chargepump dc - dc converter. it provides the necessary +12v 5% output to program byte - wide flash memories, and requires no inductors to deliver a guaranteed 30ma output from inputs as low as 4.75v. it fits into less than 0.1in2 of board space. the BL8052 is a pin - compatible upgrade to the BL8052 , and is recommended for new designs. the BL8052 offers lower quiescent and shutdow n currents, and guarantees the output current over all temperature ranges. the BL8052 is the first charge - pump boost converter to provide a regulated +12v output. it requires only a few inexpensive capacitors, and the entire circuit is completely surface - m ountable. a logic - controlled shutdown pin that interfaces directly with microprocessors reduces the supply current to only 0. 3 a. the BL8052 comes in 8 - pin narrow so and dip packages. features ? regulated +12v 5% output voltage ? 4.5v to 5.5v supply voltage range ? fits in 0.1in2 ? guaranteed 30ma output ? no inductor uses only 4 capacitors ? 9 5a quiescent current ? logic - controlled 0. 3 a shutdown ? 8 - pin narrow so and dip packages applications ? +12v flash memory programming supplies ? compact +12v op - amp supplies ? switching mosfets in low - voltage systems ? dual - output +12v and +20v supplies typical application pin out & marking bl8 052 bl80 5 2
www. belling .com .cn 2 BL8052 absolute maximum rating parameter value max input voltage 6 v shdn 0.3v~(vin+0.3v) iout continuous 50ma max operating junction temperature(tj) 125 ? c ambient temperature(ta) - 40 ? c C 85 ? c thermal resistance : ja 150 c/w storage temperature(ts) - 40 ? c - 150 ? c lead temperature & time 260 ? c, 10s note: exceed these limits to damage to the device. exposure to absolute maximum rating conditions may affect device reliability. r ecommended work conditions parameter value input voltage range max. 6 v operating junction t emperature(t j ) - 20 ? c C 125 ? c electrical characteristics for each channel ( v cc = 4. 5v to 5.5v , t a =25 ? c , unless otherwise noted ) symbol parameter conditions min typ max unit vcc breakdown supply voltage no load, v shdn =0v 9.4 v vout output voltage shdn =0v 95 500 ua shutdown current no load, v shdn =vcc 0.3 10 ua f osc oscillator frequency vcc=4v, iout=30ma 620 khz power efficiency vcc=5v, iout=30ma 76.4 % r sw vcc to vout switch impedance vcc=v shdn =5v iout=77ua 2.6 k ohm iout=37ua 2.7 v ih shutdown input threshold 2.4 2.5 v v il 1.3 shdn pin current vcc=5v, v shdn =0v 0 ua vcc=v shdn =5v 0
www. belling .com .cn 3 BL8052 pin description pin # name description 1 c1 - negative terminal for the first chargepump capacitor 2 c1+ positive terminal for the first chargepump capacitor 3 c2 - negative terminal for the second charge - pump capacitor 4 c2+ positive terminal for the second charge - pump capacitor 5 vcc supply voltage 6 vout +12v output voltage. vout = vcc when in shutdown mode. 7 gnd ground 8 shdn active - high cmos - logic level shutdown input. shdn is internally pulled up to vcc. connect to gnd for normal peration. in shutdown mode, the charge pumps are turned off and vout = vcc. block diagram c3 must be placed as close to the device aspossible and could be omitted if very low outputnoise performance are not required. figure1 block diagram
www. belling .com .cn 4 BL8052 typical performance characteristics ( tested under ta=25 ? c, unless otherwise specified ) load transient response c1: output voltage ripple, vcc=5.0v c4: output current, iout=0ma to 30ma line transient response c1: output voltage ripple c3: supply voltage, vcc=4.5v to 5.5v, iout=10ma 0 10 20 30 40 50 60 70 80 90 0 10 20 30 40 50 60 efficiency(%) iout(ma) efficiency vs. load current vcc=5.5v vcc=5v vcc=4.75v vcc=4.5v vcc=3.2v 0 2 4 6 8 10 12 14 0 10 20 30 40 50 60 vout(v) iout(ma) output voltage vs. output current vcc=5.5v vcc=5v vcc=4.75v vcc=4.5v vcc=3.2v
www. belling .com .cn 5 BL8052 detailed description BL8052 is a charge - pump ic. it can provide a 12v regulated output 30ma from voltage input as low as 4.75 without any inductors. it is useful for a wide range of applications and its performances makes it ideal for flash memory programming supply. figure 1 is a simplified block diagram of BL8052 . when the s1 switches are closed and the s2 switches are open, capacitors c1 and c2 are charged up to vcc. and then the s1 switches are opened and the s2 switches are closed, capacitors c1 and c2 are connected in series between vcc and vout. a feedback scheme adjusts the output voltage to 12v 5%. a good layout design is strongly recommended for noise re ason. very short connections to the capacitors should be used for best performance. c3 and c4 must have low esr in order to minimize the output ripple. c1 and c2 should use ceramic or tantalum capacitors in the 0.22f to 1.0f range. package outline package sop8 devices per reel 2500 unit mm package specification
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