ts1537a/b 1-5 2003/12 rev. a ts1537a/b dual 1a low dropout posi tive voltage regulator dual output 3.3 with 2.5v or 1.8v low dropout voltage 1.3v max. general description the ts1537a & ts1537b are low dropout positive voltage regulators with minimum of 1a output current capability. the product is specifically designed to provide well-regulated supply for low voltage ic applications such as high-speed bus termination and low current 3.3v/2.5v (ts1537a) or 3.3v/1.8v(ts1537b) logic supply. this series are guaranteed to have less 1.4v dropout at full load current making it ideal to provide well regulated outputs dual channels with up to 12v input supply. this series is offered in 5-pin to-263-5l package. features ? low dropout performance 1.3v max. ? full current rating over line and temperature. ? fast transient response ? 2%total output regulation over line, load and temperature ? build-in thermal shutdown each channel ? output current limiting for each channel ? good noise rejection ? dual output channel 1=3.3v, ? channel 2=2.5v (ts1537a) or 1.8v (ts1537b) block diagram (each channel) ordering information part no. operating temp. (ambient) package ts1537acm5 TS1537BCM5 -0 ~ +85 o c to-263-5l note: ts1537a is ch1=3.3v, ch2=2.5v, ts1537b is ch1=3.3v, ch2=1.8v. absolute maximum rating input supply voltage vin 12 v operation input supply voltage vin (operate) 10 v power dissipation p d internally limited w operating junction temperature range t j 0 ~ +150 o c storage temperature range t stg -65 ~ +150 o c lead soldering temperature (260 o c) 10 s pin assignment: 1. input 2 2. input 1 3. ground 4. output 1 (3.3v) 5. output 2 (2.5v/1.8v)
ts1537a/b 2-5 2003/12 rev. a electrical characteristics ta = 25 o c, unless otherwise specified. parameter conditions min typ max unit ts1537a/b-vout 1 4.8v vin 7v, io=10ma 3.267 3.3 3.366 v ts1537a-vout 2 4v vin 7v, io=10ma 2.475 2.5 2.550 output voltage ts1537b-vout 2 4v vin 7v, io=10ma 1.782 1.8 1.836 v input supply voltage -- -- 10 v line regulation vout+1.5v vin 7v, io=10ma -- 0.015 0.2 % vout 1 vin=5v, 10ma io 1a load regulation (note 1,2) vout 2 vin=4v, 10ma io 1a -- 0.5 1.0 % dropout voltage io=1a, ? vout=0.1%vout -- 1.3 1.4 v minimum load current 0 o c tj 125 o c, (note 3) -- 8 10 ma thermal regulation ta=25 o c, 30ms pulse -- 0.008 0.04 ua current limit vin - vout=3v 1.1 -- -- a temperature stability io=10ma -- 0.5 -- % ripple rejection f = 120hz, io=1a cout=25uf, vin=vout + 3v -- 60 70 db thermal performance condition package type typ unit thermal resistance junction to ambient to-263-5l 85 o c/w note 1: see thermal regulation specification for changes in output voltage due to heating effects. line and load regulation are measured at a constant junction temperature by low duty cycle pulse testing. load regulation is measured at the output lead = 1/18? from the package. note 2: line and load regulation are guaranteed up to the maximum power dissipation of 15w. power dissipation is determined by the input / output voltage difference and the output current. guaranteed maximum power dissipation will not be available over the full input / output voltage range. note 3: quiescent current is defined as the minimum output current required to maintain the regulation.
ts1537a/b 3-5 2003/12 rev. a typical application circuit ?a? version ?b? version
ts1537a/b 4-5 2003/12 rev. a electrical characteristics curve (each channel) figure 1: dropout voltage v.s. output current figure 2: load regulation v.s. temp. figure 3: output change v.s. temp. figure 4: line regulation figure 5: line transient response figure 6: load transient response
ts1537a/b 5-5 2003/12 rev. a to-263-5l mechanical drawing b d c a j i h g f e to-263-5l dimension millimeters inches dim min max min max a 10.220 10.260 0.402 0.404 b 14.600 15.870 0.575 0.625 c 0.750 0.770 0.030 0.030 d 1.573 1.827 0.062 0.072 e 4.560 4.570 0.179 0.180 f 1.240 1.270 0.049 0.050 g 2.280 2.790 0.090 0.110 h 0.280 0.320 0.011 0.013 i 8.240 8.280 0.324 0.326 j 1.540 1.800 0.060 0.071
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