unisonic technologies co., ltd ucs1201 preliminary linear integrated circuit www.unisonic.com.tw 1 of 5 copyright ? 2013 unisonic technologies co., ltd qw-r103-066.a lo w voltage synchronous buck controller ? description the utc ucs1201 is a low voltage buck controller. it provides the control for a dc-dc power solution producing an output voltage as low as 0.980v ov er a wide current range. the utc ucs1201 operates at a default switching frequency of 200khz, but switching frequency is user-programmable with an additional resistor between r osc and ground. this device provides undervoltage lockout pr otection, soft-start, and is assembled in an sop-8 package. ? features * 0.980v1.0% reference voltage * 200ns transient response * soft-start * 200khz oscillator frequency (no external resistor required) * uvlo * ovp through synchronous mosfets * synchronous n-channel buck design sop-8 ? ordering information ordering number package packing lead free halogen free ucs1201l-s08-r ucs1201g-s08-r sop-8 tape reel UCS1201L-S08-T ucs1201g-s08-t sop-8 tube
ucs1201 preliminary linear integrated circuit unisonic technologies co., ltd 2 of 5 www.unisonic.com.tw qw-r103-066.a ? pin configuration ? pin description pin no. pin name description 1 v cc power supply input. 2 r osc frequency adjust pin. 3 nc no connect. 4 comp error amp output. 5 gate(h) high-side switch fet driver pin. 6 gate(l) low-side synchronous fet driver pin. 7 v fb feedback voltage 8 gnd ground ? block diagram v cc - + + - - + + - - + + - + - - + oscillator 200khz frequency adjust 0.465v 0.98v error amp 0.25v 8.5v/7.5v uvlo pwm comp latch latch gate(l) nc r osc gate(h) v fb comp driver gnd
ucs1201 preliminary linear integrated circuit unisonic technologies co., ltd 3 of 5 www.unisonic.com.tw qw-r103-066.a ? absolute maximum rating parameter symbol ratings unit operating junction temperature t j 150 c storage temperature range t stg -65~150 c notes: absolute maximum ratings are those values be yond which the device could be permanently damaged. absolute maximum ratings are stress ratings only and functional device oper ation is not implied. ? thermal data parameter symbol ratings unit junction to ambient ja 165 /w junction to case jc 48 /w ? maximum rating parameter symbol v max v min i source i sink ic power input v cc 20v -0.5v n/a 1.5a peak, 450ma dc compensation capacitor comp 6.0v -0.5v 10ma 10ma voltage feedback input v fb 6.0v -0.5v 1.0ma 1.0ma frequency adjust r osc 6.0v -0.5v 1.0ma 1.0ma high-side fet driver gate(h) 20v -0.5v, -2.0v for 50ns 1.5a peak, 200ma dc 1.5a peak, 200ma dc low-side fet driver gate(l) 20v -0.5v, -2.0v for 50ns 1.5a peak, 200ma dc 1.5a peak, 200ma dc ground gnd 0.5v -0.5v 1.5a peak, 450ma dc n/a
ucs1201 preliminary linear integrated circuit unisonic technologies co., ltd 4 of 5 www.unisonic.com.tw qw-r103-066.a ? electrical characteristics (0c2.0v 40 60 105 ns gate(l) to gate(h) delay t dl gate(l)<2.0v, gate(h)>2.0v 40 60 105 ns minimum pulse width t pulse gate(x)=4.0v 250 ns high voltage (ac) v h measure gate(l) or gate(h) 0.5nf ucs1201 preliminary linear integrated circuit unisonic technologies co., ltd 5 of 5 www.unisonic.com.tw qw-r103-066.a ? typical application circuit 12v d3 bas20ht1 r1 470 q3 mmbt3904lt1 d1 18v zener d2 bav99lt1 c4 1.0f l1 + c1 1000f/16v + c2 1000f/16v c3 0.1f r3 opition u1 v cc r osc nc comp gnd v fb gate(h) gate(l) c11 c10 4700pf r6 5.11k r5 3.32k 0.98v utc ucs1201 c9 0.01f q1 ut60n03 q2 ut110n03 4.7h + 1000f*2 2.5v/10a 104 0.1f c11 0.1f bzx84c18v l2 1.0h option v cc r osc nc comp gnd v fb gate(h) gate(l) 0.1f utc ucs1201 0.1f 12v 1000pf 2.26k 10k ut65n03 ut65n03 5v 1.4h 33f 56f 1.2v/10a utc assumes no responsibility for equipment failures that result from using products at values that exceed, even momentarily, rated values (such as maximum ratings, operating condition ranges, or other parameters) listed in products specifications of any and all utc products described or contained herein. utc products are not designed for use in life support appliances, devices or systems where malfunction of these products can be reasonably expected to result in personal injury. reproduction in whole or in part is prohibited without the prior written consent of the copyright owner. the information presented in this document does not form part of any quotation or contract, is believed to be accurate and reliable and may be changed without notice.
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