www. b elling .com . cn 1 dual 1 a low dropout regulator b l 1118 description BL1118 is a dual channel low - dropou t regulator that delivers a maximum current of 1 a for each individual output. typical dropout voltage at 1a load current is 1.3v. each individual output voltage can be set independently as fixed voltage ( e . g 1.2v, 1.8v, 2.5v, 3.3v, 5v ) or a djustable output which can provide an output voltage from 1.25 to 12 v with two external resistors . the output accuracy of each channel is set within 2% by trimming. BL1118 offers thermal shut down and current limit function s to ensure reliability of device and power syste m. package input/output pin configuration can be customized on demand ( i.e both output can share one input to save one input capacitor and corresponding pcb real estate) . BL1118 is available in lead (pb) - free e so p - 8 (with exposed pad for heat dissipation) package . features ? dual channel output with each individual output can be either fixed output version or adjustable version. ? maximum output current for each channel is 1a ? range of operation input voltage: max 12v ? standby current of each output : 2ma (typ.) ? line regulation: 0. 1 %/v (typ.) ? load regulation: 10mv (typ.) ? environment temperature: - 20 ? c ~85 ? c ? c ompatible with tantalum capacitor, electrolytic capacit or and mlcc . applications ? power management for computer mother board, graphic card ? lcd monitor and lcd tv ? dvd decode board ? adsl modem ? post regulators for switching supplies typical application fig.1. typical application of BL1118 BL1118 g n d / a d j v i n 1 g n d / a d j v i n 2 v o u t 2 v o u t 2 v o u t 1 v o u t 1 v i n 1 v i n 2 v o u t 1 v o u t 2 l c 1 1 1 8 c i n 1 1 0 u f c i n 2 r 1 r 2 1 0 u f c o u t 1 1 0 u f c o u t 2 1 0 u f 1 2 3 4 5 6 7 8
www. b elling .com . cn 2 b l1118 ordering information BL1118 1 2 3 4 5 code description 1 temperature&rohs : c: - 40~85 ? c , pb free rohs std. 2 package type: s 8: e so p - 8 3 packing type: tr: tape&reel (standard) 4 ch1 output voltage: e.g. 33 = 3.3 v ad = adj 5 ch 2 output voltage: e.g. 33 = 3.3 v ad = adj marking descripton marking BL1118 c s 8tr 1118 p r oduct code llll l ot n o. xxyy xx vo1 output voltage yy vo2 output voltage pin configuration pin symbol description 1 gnd ground 2 vin1 channel 1 input 3 gnd ground 4 vin2 channel 2 input 5 vout2 channel 2 output 6 vout2 channel 2 output 7 vout1 channel 1 output 8 vout1 channel 1 output absolute maximum rating parameter value max input voltage 12 v operating junction temperature(tj) 125 ? c ambient temperature(ta) - 2 0 ? c - 85 ? c package thermal resistance ( ? jc) e so p8 10 ? c / w storage temperature(ts) - 40 ? c - 150 ? c lead temperature & time 260 ? c ,10s note: 1) exceed these limits to damage to the device. 2) exposure to absolute maximum rating conditions may affect device reliability. recommended work conditions parameter value input voltage range max. 12 v ambient temperature - 2 0 ? c 85 ? c
www. b elling .com . cn 3 b l1118 electrical characteristics *for each individual channel output t est conditions: cin= 0. 1uf, cout= 10 uf, t a =25 ? c, unless otherwise specified. symbol parameter conditions min typ max unit vref reference voltage BL1118 - adj 1.225 1.25 1.275 v 10maiout1a , vin=3.25v vout output voltage BL1118 - 1.2v 1.176 1.2 1.224 v 0iout1a , vin=3.2v BL1118 - 1.8v 1.764 1.8 1.836 v 0iout1a , vin=3.8v BL1118 - 2.5v 2.45 2.5 2.55 v 0iout1a , vin=4.5v BL1118 - 3.3v 3.234 3.3 3.366 v 0iout1a , vin=5.3v BL1118 - 5.0v 4.9 5 5.1 v 0iout1a , vin=7.0v vout line regulation BL1118 - 1.2v 0.1 0.2 %/v iout=10ma, 2.7v vin 1 0 v BL1118 - adj 0.1 0.2 %/v iout=10ma, 2.75v vin 12v BL1118 - 1.8v 0.1 0.2 %/v iout=10ma, 3.3v vin 12v BL1118 - 2.5v 0.1 0.2 %/v iout=10ma, 4.0v vin 12v BL1118 - 3.3v 0.1 0.2 %/v iout=10ma, 4.8v vin 12v BL1118 - 5.0v 0.1 0.2 %/v iout=10ma, 6.5v vin 12v vout load regulation BL1118 - adj 10 30 mv vin =2.7 5 v, 10ma iout 1a BL1118 - adj 10 30 mv vin =2.75v, 10ma iout 1a BL1118 - 1.8v 10 30 mv vin=3.3v, 10ma iout 1a BL1118 - 2.5v 10 30 mv vin=4.0v, 10ma iout 1a BL1118 - 3.3v 10 30 mv vin=4.8v, 10ma iout 1a BL1118 - 5.0v 10 30 mv vin=6.5v, 10ma iout 1a
www. b elling .com . cn 4 b l1118 electrical characteristics continued symbol parameter conditions min typ max unit vdrop dropout voltage iout=100ma 1.23 1.3 v iout=1a 1.3 1.5 v i limit current limit vin - vout=2v, tj=25c 1 a i min minimum load current BL1118 - adj 2 10 ma iq quiescent current BL1118 - 1.2v, vin =10v 2 5 ma BL1118 - 1.8v, vin =12v 2 5 ma BL1118 - 2.5v,vin =12v 2 5 ma BL1118 - 3.3v, vin =12v 2 5 ma bl11 18 - 5.0v, vin =12v 2 5 ma i adj adjust pin current BL1118 - adj 55 120 ua vin =5v, 10ma iout 1a ichange iadj change BL1118 - adj 0.2 10 ua vin =5v, 10ma iout 1a v/t temperature coefficient 100 ppm ? j a junction - ambient thermal resistance e sop - 8 63 c/w note: 1) all test are conducted under ambient temperature 25 c and within a short period of time 20ms 2 ) load current smaller than minimum load current of BL1118 - adj will lead to unstable or oscillation output.
www. b elling .com . cn 5 b l1118 block diagram fig.2 block diagram for each individual channel detailed description BL1118 is a series of dual channel low - dropout regulator that delivers a maximum current of 1a for each individual output. typical dropout voltage at 1a load current is 1.3v. each individual output voltage can be set independently as fixed voltage (i.e . 1. 2v, 1.8v, 2.5v, 3.3v, 5v) or adjustable output which can provide an output voltage ranges from 1.25 to 12 v with two external resistors . the output accuracy of each channel is set within 2% by trimming. the device has build - in modules including start - up ci rcuit, bias circuit, bandgap, thermal shutdown, current limit, power transistors and driver circuit. t hermal shut down and current limit functions ensure reliability of device and power system. the bandgap module provides stable reference voltage whose temperature coefficient is compensated by careful design considerations. the temperature coefficient is under 100 ppm/ c . t he accuracy of output voltage is guaranteed by trimming technique. package input/o utput pin configuration can be customized on demand ( i.e both output can share one input to save one input capacitor and corresponding pcb real estate). BL1118 is available in lead (pb) - free e sop - 8 package.
www. b elling .com . cn 6 b l1118 typical application fig . 3 . typical application schematic of BL1118 BL1118 has both fixed voltage version ( 1.2v, 1.8v, 2.5v, 3.3v, 5v ) and adjustable voltage version . the input and output capacitors of each channel can be either tantalum, e lectrolytic or ceramic capacitor. figure 3 shows both fixed voltage and adjustable voltage application schematic. channel 1 (designated as pin 1 \ 2 \ 7 \ 8) is a typical application of fixed voltage. channel 2 (designated as pin 3 \ 4 \ 5 \ 6) is the schematic of adjustable version appl ication . the adjustable version provides a 1.25v reference voltage with regard to its adj pin (shown as pin 5 \ 6 as its output and pin3 as its adjustable pin in fig.3). the output voltage of adjustable version follows the equation: v o ut = 1.25 ? (1+r 2 /r 1 )+i adj ? r 2 . we can ignore i adj because i adj (about 50ua) is much less than the current of r1 ( in the order of several milliamps ). 1) to meet the minimum load current (>10ma) requirement, r1 is recommended to be 125ohm or lower. 2) using a bypass capacitor (c adj ) between the adj pin and ground can improve ripple rejection . this bypass capacitor prevents ripple from being amplified as the output voltage is increased. the impedance of c adj should be less than r1 to prevent ripple from being amplified. as r1 is n ormally in the range of 100~500, the value of c adj should satisfy this equation: 1/(2 ? ? f ripple ? c adj )BL1118 can be calculated as power dissipation = (vin1 - vout1)iout1+ (vin2 - vout2)iout2 for proper function and safe operation of the device, power dissipation is recommended to be limited within 2w. BL1118 g n d / a d j v i n 1 g n d / a d j v i n 2 v o u t 2 v o u t 2 v o u t 1 v o u t 1 v i n 1 v i n 2 v o u t 1 v o u t 2 l c 1 1 1 8 c i n 1 1 0 u f c i n 2 r 1 r 2 1 0 u f c o u t 1 1 0 u f c o u t 2 1 0 u f 1 2 3 4 5 6 7 8
www. b elling .com . cn 7 b l1118 typical performance characteristics t=25 c unless specified. line regulation load regulation dropout voltage thermal performance with otp adj vout vs. vin adj dropout vs. iout adj vout vs. temp adj vout vs. iout 0 0.3 0.6 0.9 1.2 1.5 0 2 4 6 8 10 12 14 vout(v) vin (v) lc1117 - adj vout vs. vin 0 0.3 0.6 0.9 1.2 1.5 0 0.2 0.4 0.6 0.8 1 1.2 vout(v) iout (a) lc1117 - adj vout vs. iout 0 0.3 0.6 0.9 1.2 1.5 0 0.2 0.4 0.6 0.8 1 1.2 dropout voltage (v) iout (a) lc1117 - adj dropout vs. iout 0 0.3 0.6 0.9 1.2 1.5 - 50 0 50 100 150 200 vout(v) temperature ( ? c) lc1117 - adj vout vs. temp
www. b elling .com . cn 8 b l1118 package outline package e sop - 8 devices per reel 2500pcs unit mm package specification
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