View YB1696_714145.PDF datasheet online --- IC-ON-LINE

Datasheet File OCR Text:

YB1696 150khz, 3a pwm buck switching regulator YB1696 mrev.1.1 www.yobon.com.tw 1 description the YB1696 series are monolithic integrated circuits that provide all the active functions for a step-down dc/dc converter, capable of driving a 3a load without additional transistor component. requiring a minimum number of external component, the board space can be saved easily. the external shutdown function can be controlled by ttl logic level and then come into standby mode. the internal compensation makes feedback control have good line and load regulation without external design. r egarding protected function, thermal shutdown is to prevent over temperature oper ating from damage, and current limit is against over current operating of the output switch. the YB1696 series operates at a switching frequency of 150khz thus allowing smaller sized filter components than what would be needed with lower frequency swit ching regulators. other features in clude a guaranteed + 4% tolerance on output voltage under specified input voltage and output load conditions, and + 15% on the oscillator frequency. the output version included fixed 5v and an adjustable type. the package is available in a standard 5-lead to-263(s). typical application circuit features ? 5v and adjustable output versions ? adjustable version output voltage range, 1.23v to 28v + 4% max over line and load condition ? available in to263-5l packages ? voltage mode non-synchronous pwm control ? thermal-shutdown and current-limit protection ? on/off shutdown control input ? input voltage range up to 32v ? output load current: 3a ? 150 khz fixed frequency internal oscillator ? low power standby mode ? built-in switching transistor on chip applications ? simple high-efficiency step-down regulator ? efficient preregulator for linear regulators ? on-card switching regulators ? positive to negative converter ? battery charger
YB1696 150khz, 3a pwm buck switching regulator YB1696 mrev.1.1 www.yobon.com.tw 2 pin configuration pin description table 1 pin name pin function vin operating voltage input output switching output gnd ground fb output voltage feedback control sd on/off shutdown
YB1696 150khz, 3a pwm buck switching regulator YB1696 mrev.1.1 www.yobon.com.tw 3 ordering information marking information absolute maximum ratings YB1696-50 : for fixed output voltage of 5.0v YB1696-adj : for external adjustable version YB1696-50 : for fixed output voltage of 5.0v YB1696-adj : for external adjustable version symbol parameter rating unit v cc supply voltage +34 v v sd on/off pin input voltage -0.3 to +25 v v fb feedback pin voltage -0.3 to +25 v v out output voltage to ground -1 v p d power dissipation internally limited w t st storage temperature -65 to +150 o c t op operating temperat ure -40 to +125 o c v op operating voltage +4.5 to +25 v
YB1696 150khz, 3a pwm buck switching regulator YB1696 mrev.1.1 www.yobon.com.tw 4 electrical characteristics symbol parameter conditions min. typ. max. unit 60 i b feedback bias current v fb =1.3v (adjustable version only) 40 100 na 127 150 173 f osc oscillator frequency 110 173 khz 1.4 v sat saturation voltage i out =3a no outside circuit v fb =0v force driver on 1.3 1.5 v max. duty cycle(on) v fb =0v force driver on 100 dc min. duty cycle(off) v fb =12v force driver off 0 % 5.5 i cl current limit peak current no outside circuit v fb =0 force driver on 3.6 4.5 6.5 a output = 0 no outside circuit v fb =12 force driver off 200 ua i l output = 1 output leakage current v in =32v 2 60 ma i q quiescent current v fb =12 force driver off 5 10 ma 250 i stby standby quiescent current on/off pin=5v v in =24v 150 300 ua v il low (regulator on) - 0.6 v ih on/off pin logic input threshold voltage high (regulator off) 2.0 1.3 - v i h on/off pin logic input current v logic =2.5v (off) 15 25 i l on/off pin input current v logic =0.5v (on) 0.02 5 ua jc thermal resistance junction to case 3.5 o c/w ja thermal resistance with copper area of approximately 3 in 2 junction to ambient 23 o c/w unless otherwise s p ecified, v in =12v for 3.3v, 5v, ad j ustable version. i l o ad =0.3 a
YB1696 150khz, 3a pwm buck switching regulator YB1696 mrev.1.1 www.yobon.com.tw 5 symbol parameter conditions typ. limit unit fb v output feedback 5v < v in < 32v 0.2a < i load < 3a v out programmed for 3v 1.23 1.193/ 1.18 1.267/ 1.28 v v min v max YB1696_adj efficiency v in = 12v, i load =3a 73 % out v output voltage 8v < v in < 32v 0.2a < i load < 3a 5 4.8/ 4.75 5.2/ 5.25 v v min v max YB1696_50 efficiency v in = 12v, i load =3a 80 %
YB1696 150khz, 3a pwm buck switching regulator YB1696 mrev.1.1 www.yobon.com.tw 6 typical characteristics typical performance characteristics normalized output voltage 4.90 4.95 5.00 5.05 5.10 -50-25 025 5075100125 output voltage change v in =20v, i load =3a normalized at t j =25 o c junction temperature( o c) junction temperature( o c) switch current limit (a) switch current limit 0.0 5.0 10.0 15.0 20.0 25.0 -50 -25 0 25 50 75 100 125 junction temperature( o c) supply current (ma) operating quiescent current junction temperature( o c) efficiency (%) efficiency 70 75 80 85 90 95 810152025 30 35 40 5v 3.3v 3a load 1.2 1.3 1.4 1.5 1.6 1.7 2.0 3 45 switch current(a) saturation voltage (v) 1 2 3 1 : -40 o c 2 : 25 o c 3 : 125 o c switch saturation voltage 4.0 4.5 5.0 5.5 6.0 -50 -25 0 25 50 75 100 125 v in =12v, v out =5v supply volotage (v) current (ua) 0.0 40.0 80.0 120.0 160.0 200.0 shutdown quiescent current 10 20 30 40 v on/off =5v 1 : -40 o c 2 : 25 o c 3 : 125 o c 1 3 2 switch on switch off 100
YB1696 150khz, 3a pwm buck switching regulator YB1696 mrev.1.1 www.yobon.com.tw 7 junction temperature( o c) bias current (na) feedback pin bias current 1.4 5 10152022232425 on/off pin voltage (v) current (ua) on/off pin current (sinking) 0.0 30.0 60.0 90.0 120.0 150.0 v in =40v -40 o c t j 125 o c ? 0.0 10.0 20.0 30.0 40.0 50.0 -50 -25 0 25 50 75 100 125 adjustable version only 0.0 1.0 2.0 3.0 4.0 5.0 -50 -25 0 25 50 75 100 125 junction temperature ( o c) supply voltage (v) minimum operating supply voltage v out =1.23v i load =120ma junction temperature ( o c) threshold voltage (v) on/off threshold voltage 0.0 1.0 2.0 3.0 4.0 5.0 -50 -25 0 25 50 75 100 125 switch frequency junction temperature ( o c) frequency (khz) 0.0 50.0 100.0 150.0 200.0 -50 -25 0 25 50 75 100 125
YB1696 150khz, 3a pwm buck switching regulator YB1696 mrev.1.1 www.yobon.com.tw 8 functional block diagram current source bias 1.235v reference 2.5v regulator 150khz osc. start up + + _ + _ thermal limit pre-driver comp comp gnd output v in sd fb 220mv 200mv 3a switch + _ _ amp comp typical application circuit
YB1696 150khz, 3a pwm buck switching regulator YB1696 mrev.1.1 www.yobon.com.tw 9 function description pin functions +v in this is the positive in put supply for the ic switching regulator. a suitable input bypass capacitor must be present at this pin to minimize voltage transients and to supply the switching currents needed by the regulator. ground circuit ground. output internal switch. the voltage at this pin switches between (+v in ? v sat ) and approximately ? 0.5v, with a duty cycle of approximately v out / v in . to minimize coupling to sensitive ci rcuitry, the pc board copper area connected to this pin should be kept a minimum. feedback senses the regulat ed output voltage to complete the feedback loop. on /off allows the switching r egulator circuit to be shutdown using logic level signals thus dropping the total input supply current to approximately 150ua. pull ing this pin below a threshold voltage of approximately 1.3v turns the regulator on, and pulling this pin above 1.3v (up to a maximum of 25v) shuts the regulator down. if this shutdown feature is not needed, the on /off pin can be wired to the ground pin or it can be left open, in either case th e regulator will be in the on condition. thermal considerations the YB1696 is available in a 5-pin surface mount to-263. the to-263 surface mount package tab is designed to be soldered to the copper on a printed circuit board. the copper and the board are the heat sink for this package and the other heat pr oducing components, such as the catch diode and inductor. the pc board copper area that the package is soldered to should be at least 0.8 in 2 , and ideally should have 2 or more square inches of 2 oz. additional copper area improves the thermal characteristics, but with copper areas greater than approximately 6 in 2 , only small improvements in heat dissipation are realized. if further thermal improvements are needed, double side d, multilayer pc board with large copper areas and/or airflow are recommended. the YB1696 (to-263 package) junction temperature rise above ambient temperature with a 2a load for various input and output voltages. this data was taken with the circuit operating as a buck switching regulator with all components mounted on a pc board to simulate the junction temperature under actual operating conditions. this curve can be
YB1696 150khz, 3a pwm buck switching regulator YB1696 mrev.1.1 www.yobon.com.tw 10 used for a quick check for the approximate junction temperature fo r various conditions, but be aware that ther e are many factors that can affect the j unction temperature. when load currents higher than 3a are used, double sided or multilayer pc boards with large copper ar eas and/or airflow might be needed, especially for high ambient temperatures and high output voltages. for the best thermal performance, wide copper traces and generous amounts of printed circuit board copper should be used in the board layout. (once exception to this is the output (swit ch) pin, which should not have large areas of copper.) large areas of copper provid e the best transfer of heat (lower thermal resistance) to the surrounding air, and moving air lowers the thermal resistance even further. package thermal resistance and junction temperature rise numbers are all approximate, and there are many factors that will affect these numbers. some of these factors include board size, shape, thickness, position, location, and even board temperature. other factors are, trace width, total printed circuit copper area, copper thickness, single or double-sided, multilayer board and the amount of solder on the board. the effe ctiveness of the pc board to dissipate heat also depends on the size, quantity and spacing of other components on the board, as well as whether the surroundi ng air is still or moving. furthermore, some of these components such as the catch diode will add heat to the pc board and the heat can vary as the input voltage changes. for the inductor, depending on the physical size, type of core material and the dc resistance, it could either act as a heat sink taking heat away from the board, or it could add heat to the board.
YB1696 150khz, 3a pwm buck switching regulator YB1696 mrev.1.1 www.yobon.com.tw 11 package information to263-5l a c2 c e l2 e b d l f l1 dimensions in millimeters dimensions in inches symbol min. max. min. max. a 4.38 4.78 0.172 0.188 b 0.72 0.92 0.028 0.036 c 0.36 0.41 0.014 0.016 c2 1.18 1.38 0.046 0.055 d 8.23 8.63 0.324 0.340 e 9.96 10.36 0.392 0.407 e 1.60 1.80 0.062 0.071 f 6.80 7.20 0.267 0.283 l 15.14 15.74 0.596 0.620 l1 2.28 2.79 0.089 0.110 l2 1.40 1.80 0.055 0.071

▲Up To Search▲

Price & Availability of YB1696

	To Download YB1696 Datasheet File
If you can't view the Datasheet, Please click here to try to view without PDF Reader .