advanced power electronics corp. features description input voltage : 1.2v to 12v low quiescent current : 17ua (typ.) low saturation voltage : 200mv typical at 300ma 350ma typical switching current limiting high output voltage : up to 34v low profile sot-23-5l pb-free packaging halogen free product data and specifications subject to change without notice typical application 20130108v1.1 APE1910 step-up pfm dc/dc converter 1 the APE1910 is a pulse frequency modulation (pfm) dc/dc converter. it is low quiescent current 30ua and shutdown current less 1ua. the APE1910 feature a wide input voltage. the operating voltage is ranged from 1.2v to 12v. it also feature low quiescent current, switching current limiting, low temperature coefficient. smaller package size and fewer tiny external components are required in the application to save space and lower cost. APE1910 is available in sot-23-5l c1 4.7uf/25v APE1910 sw gnd fb en vin l1 22uh' 1 2 c3 4.7u/50v vout=30v r2 200k vout= vfb x (1 + r3/r2) vin=5v r1 100k vfb=1.23v, r2 suggest 100k~300k c2 option d1 b140 1 2 r3 4.7m figure 2. vcc=1.2~2.5v/ vout=3.3v for 1 or 2 cells to 3.3v boos t converter figure 1. vcc=5v/ vout=30v for lce.oled bias supply r1 100k vout=vfb x (1 + r3/r2) c4 10pf vfb=1.23v, r2 suggest 100k~300k r3 202k d1 b140 1 2 c2 option c1 4.7uf/25v l1 10uh 1 2 r2 120k vout=3.3v c3 4.7u/50v APE1910 sw gnd fb en vin vin=1.2v~2.5v
advanced power electronics corp. APE1910 absolute maximum ratings v in pin voltage(v in ) --------------------------------------- - 15v sw voltage(v sw ) ------------------------------------------ - 36v feedback pin voltage(v fb ) ----------------------------- - v in en pin voltage(v en ) -------------------------------------- - 15v maximum junction temperature(t j ) ----------------- - 150c storage temperature range(t st ) --------------------- -40c to 150c operating temperature range(t op ) ------------------ -40c to 125c power dissipation(p d ) ------------------------------------ - 0.4w thermal resistance from junction to case(rth jc ) 110c/w 250c/w note. rth ja is measured with the pcb copper area of approximately 1 in 2 (multi-layer) that need connect to gnd pin of the APE1910 package / ordering information electrical specifications (v in =5v, v out =12v, t a =25 , unless otherwise specified) parameter sym test condition min typ max units input voltage v in 1.2 - 12 v quiesceint current i ccq v fb =1.5v, not switching - 17 30 ua shutdown current i sd v en =0v - - 1 ua feedback voltage v fb 1.205 1.23 1.255 v feedback bias current i fb v fb =1.23v - 30 80 na line regulation v line 1.2vAPE1910x v in en sw gnd fb top view sot-23-5l 1 2 3 4 5
advanced power electronics corp. APE1910 block diagram application information capacitor selection inductor selection diode selection pcb layout guide 3 current-limit reference - + - + 400ns one shot v ref 1.23v v in 5 3 fb r c c c feedback comparator a1 1sw q1 2gnd 4 en shutdown current-limit comparator driver the small size of ceramic capacitors makes them ideal for APE1910 applications. x5r and x7r types are recommended because they retain thei r capacitance over wider voltage and temperature ranges than other types such as y5v or z5u. a 4.7uf input capacitor and a 4.7uf output capacitor are sufficient for most APE1910 applications. a 10uh inductor is recommended for most APE1910 applications. although small size and high efficiency are major concerns, the inductor should have low core losses and low dcr (copper wire resistance). schottky diodes with higher current ratings usually have lower forward voltage drop, larger diode capacitance and fast reverse recovery, it is the ideal choices fo r APE1910 applications. the forward voltage drop of a schottky diode represents the conduction losses in the system, while the diode capacitance (c t or c d ) represents the switching losses. for diode selection, both forward voltage drop and diode capacitance need to be considered. when laying out the pc board, the following suggestions should be taken to ensure proper operation of the APE1910. these items are also illustrated graphically in below. 1. the power traces, including the gnd trace, the sw trace and the v cc trace should be kept short, direct and wide to allow large current flow. put enough multiply-layer pads when they need to change the trace layer. 2. connect the input capacitor c1 to the v cc pin as closely as possible to get good powe r filter effect. 3. do not trace signal line under inductor.
advanced power electronics corp. APE1910 typical performance characteristics 4 15 16 17 18 19 20 21 22 23 24 25 135791113 vin (v) quiescent current (ua) vin vs quiescent current 15 16 17 18 19 20 21 22 23 24 25 -50 -25 0 25 50 75 100 temperature () quiescent current (ua) temperature vs quiescent current vin=12v vin=5v vin=1.2v 0 5 10 15 20 25 30 35 40 024681012 shutdown pin voltage (v) shutdown pin current (ua) shutdown pin voltage vs shutdwon pin current 1.205 1.21 1.215 1.22 1.225 1.23 1.235 1.24 1.245 1.25 1.255 -50 -25 0 25 50 75 100 temperature () feedback voltage (v) temperature vs feedback voltage 0 10 20 30 40 50 60 70 80 90 0 5 10 15 20 25 30 35 load current (ma) efficiency (% ) vin=2.5v vin=4.2v vin=3.3v
advanced power electronics corp. APE1910 marking information sot-23-5l 5 b1yws part number : b1 year : a = 2010 1 = 2011 week: a~z : 01~26 a~z : 27~52 id code : internal
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