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advanced analog technology, inc. ? x?w?t??ta?|3--?q ? ? advanced analog technology, inc . ? page 1 of 18 v 1.0 aat1109 details are subject to change without notice. one-channel step-up pwm controller features z under-voltage lockout (uvlo) protection z totem pole output z output short circuit protection z soft-start function z wide operating frequency ?g 10 khz to 1mhz z shutdown control z low dissipation current : typical 1.6ma in operation z sop-8 & tssop-8 package available pin configuration general description the aat1109 is a one-channel step-up pwm controller incorporating a soft-start and a short circuit protection (scp) function. this device consists of an on-chip voltage reference, error amplifier, pulse wi dth modulation controller, under-voltage lockout prot ection, soft-start, and short circuit protecti on circuits. switching frequency up to 1mhz is set by an external resistor and capacitor. soft-start time can be implemented by the scp capacitor. additionally, a chip-enable feature is also provided to power down and reduce the current supply to a 10
advanced analog technology, inc. ? x?w?t??ta?|3--?q ? ? advanced analog technology, inc . ? page 2 of 18 v 1.0 aat1109 pin description pin no. name i/o description 1 ce i chip enable input pin ?] internal pull "h" ?^ 2 scp i soft-start and sc p capacitor connection pin 3 dd v - power supply 4 out o totem pole type output pin 5 gnd - ground 6 osc o capacitor and resistor connection pin for setting the oscillation frequency 7 oe o output pin of error amplifier 8 i e i inverting input pin of error amplifier absolute maximum ratings characteristics symbol value unit supply voltage dd v 7 v output current o i 120 / 120 + ? ma operating free-air temperature range c t 20 ? + c o storage temperature range storage t 45 ? + c o power dissipation d p 500 mw recommended operating conditions symbol min max unit supply voltage dd v 2.6 6.5 v error amplifier input voltage i v 0.5 1.6 v oscillator (osc) capacitance osc c 100 10,000 pf oscillator (osc) resistance osc r 1.0 10.0 ? k oscillator (osc) frequency osc f 10 1,000 khz output current o i 30 / 30 ? + ma operating free-air temperature c t 20 ? + o
advanced analog technology, inc. ? x?w?t??ta?|3--?q ? ? advanced analog technology, inc . ? page 3 of 18 v 1.0 aat1109 electrical characteristics, dd v = 3.3v (unless otherwise specified) (see note 1) oscillator parameter symbol test condition min typ max unit oscillation frequency osc f osc c =270pf k ? 2 . 4 r osc = 400 500 600 khz frequency variation with temperature t f ? c 20 t o c ? = to c 85 o + 5 % frequency input stability v f ? 6.5v to 2.6v v dd = 1 % under-voltage protection parameter test condition min typ max unit upper threshold voltage uph v c 25 t c o = 2.12 2.47 2.85 v lower threshold voltage upl v c 25 t c o = 1.96 2.28 2.63 v hysteresis () upl uph v v ? hys v c 25 t c o = 0.19 v note 1: typical values of all parameters are specified at c 25 t c o = . short circuit protection control parameter test condition min typ max unit input threshold voltage 1 r v 1.160 1.262 1.360 v short-circuit detection threshold voltage 2 r v 1.160 1.262 1.360 v charging current scp i v 0 v scp = 15 . 2 ? ? 00 . 1 ? a soft-start parameter test condition min typ max unit charging current cs i v 0 v scp = 15 . 2 ? ? 00 . 1 ? a voltage at soft-start completion ts v 1.160 1.262 1.360 v shutdown control parameter test condition min typ max unit shutdown enable voltage se v 0.5 v shutdown release voltage sr v 2.0 v
advanced analog technology, inc. ? x?w?t??ta?|3--?q ? ? advanced analog technology, inc . ? page 4 of 18 v 1.0 aat1109 electrical characteristics, dd v = 3.3v (unless otherwise specified (see note 1) idle period adjustment section parameter test contion min typ max unit maximum duty cycle duty t pf 270 c osc = , ? = k 2 . 4 r osc , v 12 . 1 v oe = 75 85 93 % ea (error amplifier) parameter test condition min typ max unit input threshold voltage t v v 7 . 0 v oe = 1.249 1.262 1.275 v t v input stability v t v ? v 5 . 6 to 6 . 2 v dd = 2 8 mv t v variation with temperature t t v ? c 85 c to 20 t c o o + ? = 1 % input bias current b i 0.1 1.0 a + os v 1.4 1.7 output voltage swing ? os v 0.05 0.20 v output sink current + os i v 7 . 0 v oe = 3 20 ma output source current ? os i v 7 . 0 v oe = 45 ? ? a output section parameter test condition typ max unit high-level output voltage oh v ma 30 i o ? = 1.9 2.3 v low-level output voltage ol v ma 30 i o + = 0.8 1.2 v rise time rise t pf 000 , 1 c l = 100 ns fall time fall t pf 000 , 1 c l = 100 ns operating current parameter test condition min typ max unit off dd i ? output ?off? state 1.3 ma supply current on dd i ? ? = k 2 . 4 r osc 1.6 ma
advanced analog technology, inc. ? x?w?t??ta?|3--?q ? ? advanced analog technology, inc . ? page 5 of 18 v 1.0 aat1109 how to set the time const ant for soft-start and short circuit protection 1. soft-start aat1109 operates in soft-start mode. the pwm comparator monitors the voltage at soft-start setting and scp pin, which varies proportionally to each ot her. this proportion relation controls the on duty of the out pin and activates the so ft-start operation. in the soft-s tart mode, the voltage at scp pin ( scp v ) is input to the pwm comparator, so that th e on duty of the out pin is determined by the scp v. when the soft-started mode is completed, its setting voltage remains high and the circuit enters the output short circuit prot ection wait state while scp v remains low. soft-start time () () f c 84 0 t scp s . ~ sec 2. short circuit protection in response to a sudden drop of the switching regula tor output, the device locks the error amplifier, oe pin, at + os v , and starts feeding currents into the capacitor at scp pin to achieve in a voltage value of approximately 0.84v at this pin. this chain reaction protects the circuit by keeping the scp pin and output pin low. users could reverse this process by restarting the device. short circuit detection time () ( ) f c 84 0 t scp scp . ~ sec
advanced analog technology, inc. ? x?w?t??ta?|3--?q ? ? advanced analog technology, inc . ? page 6 of 18 v 1.0 aat1109 block diagram soft-start scp uvlo scp v dd out uvc latch uvc ie osc pwm comp. err-am p uvc osc scp comp. gnd oe chip enable v dd dtc 0.765v i ref ce ce ce ce ce dd v v 26 . 1 v ref v 26 . 1 v ref v 26 . 1 v ref ref v ce
advanced analog technology, inc. ? x?w?t??ta?|3--?q ? ? advanced analog technology, inc . ? page 7 of 18 v 1.0 aat1109 application circuit 1 boost (step-up)
advanced analog technology, inc. ? x?w?t??ta?|3--?q ? ? advanced analog technology, inc . ? page 8 of 18 v 1.0 aat1109 application circuit 2 (with charge pump) out n v v ? ? out p v * 3 v ? out v
advanced analog technology, inc. ? x?w?t??ta?|3--?q ? ? advanced analog technology, inc . ? page 9 of 18 v 1.0 aat1109 boost ?] step-up ?^ timing chart
advanced analog technology, inc. ? x?w?t??ta?|3--?q ? ? advanced analog technology, inc . ? page 10 of 18 v 1.0 aat1109 package dimension 8-pin sop dimensions in millimeters deminsions in inches symbols min typ max min typ max a 1.47 1.60 1.73 0.058 0.063 0.068 a1 0.10 --- 0.22 0.004 --- 0.008 a2 --- 1.45 --- --- 0.057 --- b 0.33 0.41 0.51 0.013 0.016 0.020 c 0.19 0.20 0.25 0.0075 0.008 0.0098 d 4.80 4.85 4.95 0.189 0.191 0.195 e 5.80 6.00 6.20 0.228 0.236 0.244 e1 3.80 3.90 4.00 0.150 0.154 0.157 e --- 1.27 --- --- 0.050 --- l 0.38 0.71 1.27 0.015 0.028 0.050 y --- --- 0.076 --- --- 0 0 --- 0 0 --- 0
advanced analog technology, inc. ? x?w?t??ta?|3--?q ? ? advanced analog technology, inc . ? page 11 of 18 v 1.0 aat1109 tape and reel 8-pin sop
advanced analog technology, inc. ? x?w?t??ta?|3--?q ? ? advanced analog technology, inc . ? page 12 of 18 v 1.0 aat1109 tape and reel 8-pin sop (cont.) note: 1. 10 sprocket hole pitch cumulative tolerance camber not to exceed 1 millimeter in 100 millimeters 3. material: anti-static black advantek polystyrene. 4. 0 a and 0 b are measured on a plane 0.3 millimeters above the bottom of the pocket. 5. 0 k is measured from a plane on the inside bottom of the pocket to the top surface of the carrier. 6. pocket position relative to sprocket hole is measured as true position of pocket, not pocket hole.
advanced analog technology, inc. ? x?w?t??ta?|3--?q ? ? advanced analog technology, inc . ? page 13 of 18 v 1.0 aat1 109 package dimension tssop-8
advanced analog technology, inc. ? x?w?t??ta?|3--?q ? ? advanced analog technology, inc . ? page 14 of 18 v 1.0 aat1 109 package dimension tssop-8 dimension in millimeters dimension in inches symbol min typ max min typ max a 1.05 1.10 1.20 0.041 0.043 0.047 a1 0.05 0.10 0.15 0.002 0.004 0.006 a2 ----- 1.00 1.05 ----- 0.039 0.041 b 0.25 ----- 0.30 0.010 ----- 0.012 c ----- 0.127 ----- ----- 0.005 ----- d 2.90 3.05 3.10 0.114 0.120 0.122 e 6.20 6.40 6.60 0.244 0.252 0.260 e1 4.30 4.40 4.50 0.169 0.173 0.177 e ----- 0.65 ----- ----- 0.026 ----- l 0.50 0.60 0.70 0.020 0.024 0.028 y ----- ----- 0.076 ----- ----- 0.003 o 0 o 4 o 8 o 0 o 4 o 8 note: 1. controlling dimension: millimeters. 2. lead frame material: olin c7025/eftec 64t. 3. dimension ?d? does not include mold flash, ti e bar burrs and gate burrs. mold flash, tie bar burrs and gate burrs shall not exceed 0.006? [0.15 millimeters] per end. dimension ?e1? does not include interlead flash. interlead flash shall not exceed 0.010? [0.25 millimeters] per side. 4. dimension ?b? does not include dambar protrusion. allowable dambar protrusion shall be 0.003? [0.08 millimeters] total in excess of the ?b ? dimension at maximum material condition. dambar cannot be located on the lower radius or the foot. minimum space between protrusion and an adjacent lead to be 0.0028? [0.07 millimeters]. 5. tolerance: 0.010? [0.25 millimeteres] unless otherwise specified. 6. otherwise dimension follow acceptable spec. 7. reference document: jedec spec mo-153.
advanced analog technology, inc. ? x?w?t??ta?|3--?q ? ? advanced analog technology, inc . ? page 15 of 18 v 1.0 aat1 109 tape and reel tssop-8
advanced analog technology, inc. ? x?w?t??ta?|3--?q ? ? advanced analog technology, inc . ? page 16 of 18 v 1.0 aat1 109 tape and reel tssop-8 (cont.) x.xxx x 0.0025 x.xxx 0.006 x.xx 0.025 x.x 0.10 x 0.25 unit: millimeters note: 1. 10 sprocket hole pitch cumulative tolerance
advanced analog technology, inc. ? x?w?t??ta?|3--?q ? ? advanced analog technology, inc . ? page 17 of 18 v 1.0 aat1 109 part marking sop8 top marking aat1109 xxxxxx sop8 back marking yyww part marking tssop8 top marking aat1109 xxxxxx tssop8 back marking yyww
advanced analog technology, inc. ? x?w?t??ta?|3--?q ? ? advanced analog technology, inc . ? page 18 of 18 v 1.0 aat1 109 ordering information

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