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advanced analog technology, inc. ? x?w?t??ta?|3--?q ? ? advanced analog technology, inc . ? page 1 of 17 v 1.0 aat1110 details are subject to change without notice one-channel step-down pwm controller features z under-voltage lockout (uvlo) protection z totem pole output z output short circuit protection z incorporates 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 dd v general description the aat1110 is a one-channel step-down pwm controller incorporating a soft-start function and a short circuit protection (scp) function. each device consists of an on-chip voltage reference, error amplifier, pulse wi dth modulation controller, under-voltage protection, soft -start, and short circuit protection circuits. switc hing frequencies up to 1mhz are set by an external resistor and capacitor. soft-start time can be implemented by the scp capacitor. additionally, a chip enabled feature is provided to power down and reduce the supply current to 10 a
advanced analog technology, inc. ? x?w?t??ta?|3--?q ? ? advanced analog technology, inc . ? page 2 of 17 v 1.0 aat1110 pin description pin no name i/o description 1 ce i chip enable input pin ?] internal pull "h" ?^ 2 scp - soft-start and sc p capacitor connection pin 3 dd v - power supply 4 out o totem-type output pin 5 gnd - ground 6 osc o capacitor and resistor connection pin for setting the oscillation frequency 7 oe o error amplifier output pin 8 ie i error amplifier inverting input pin absolute maximum ratings characteristics symbol value unit supply voltage dd v 7 v output current o i 120 ? ? ? recommended operati ng conditions characteristics symb ol min max unit supply voltage, dd v dd v 2.6 6.5 v error amplifier input voltage i v 0.5 1.6 v osc capacitor osc c 100 10,000 pf osc resistor osc r 1.0 10.0 ? k oscillator frequency osc f 10 1,000 khz output current o i - +30/ 30 ? ma operating free-air temperature c t 20 ?
advanced analog technology, inc. ? x?w?t??ta?|3--?q ? ? advanced analog technology, inc . ? page 3 of 17 v 1.0 aat1110 electrical characteristics, dd v = 3.3v (unless otherwise specified) (see note 1) oscillator parameter test condition min typ max unit oscillation frequency osc f osc c = 270pf, osc r= 4.2 ? ? 5 % frequency input stability v f ? dd v = 2.6v to 6.5v 1 % under-voltage protection parameter test condition min typ max unit upper threshold voltage uph v c t= 25 o c 2.12 2.47 2.85 v lower threshold voltage upl v c t= 25 o c 1.96 2.28 2.63 v hysteresis ( uph v ? upl v) hys v c t= 25 o c 0.19 v note1: typical values of all parameters are specified at c t =25 o c 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 detect threshold voltage tscd v 1.160 1.262 1.360 v charging current scp i scp v=0v 15 . 2 ? ? 00 . 1 ? a soft-start parameter test condition min typ max unit charging current cs i scp v=0v 15 . 2 ? ? 00 . 1 ? a 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 17 v 1.0 aat1110 electrical characteristics, dd v = 3.3v (unless otherwise specified) (see note 1) ea (error amplifier) parameter test condition min typ max unit input threshold voltage t v oe v = 0.7v 1.249 1.262 1.275 v t v input stability v t v ? dd v = 2.6 to 6.5v - 2 8 mv t v variation with temperature t t v ? c t= 20 ? + os v 1.4 1.7 - output voltage swing ? os v - 0.05 0.20 v output sink current + os i oe v =0.7v 3 20 - ma output source current ? os i oe v =0.7v 45 ? ? - a output section parameter test condition min typ max unit high-level output voltage oh v i o = 30 ? operating current parameter test condition min typ max unit off dd i ? output ?off? state - 1.3 - ma supply current on dd i ? r t =4.2 ?
advanced analog technology, inc. ? x?w?t??ta?|3--?q ? ? advanced analog technology, inc . ? page 5 of 17 v 1.0 aat1110 how to set the time cons tant for soft-start and short circuit protection 1. soft-start at power on, the aat1110 operates in soft-start mode. the capacitor scp c connected to scp pin starts charging at a constant current. in the so ft-start mode, the voltage at scp pin ( scp v ) is input to the pwm comparator, so that the on duty of the out pin is controlled by the scp v . at completion of the soft-start operation, the voltage at the scp pin stays low; the input from soft-start circuit to the pwm comparator stays high, and enters the short circuit protection waiting state. soft-start time ) f ( c 84 . 0 ~ (sec) t scp s 2. short circuit protection if the switching regulator output suddenly drops due to loading effect, the error amplifier output will be fixed at + om v and capacitor scp c will start charging. when the voltage at the scp pin reaches approximately 1.26v, the output pin will set low and scp pin will remain low. once the protection circuit starts operating, the circuit can be recovered by setting the power supply. short circuit detection time ) f ( c 84 . 0 ~ (sec) t scp scp
advanced analog technology, inc. ? x?w?t??ta?|3--?q ? ? advanced analog technology, inc . ? page 6 of 17 v 1.0 aat1110 block diagram soft-start scp v ref uvlo ce scp v dd out uvc latch uvc v ref 1.26v ie osc pwm comp. err-amp uvc osc v dd scp comp. gnd oe v ref 1.26v chip enable v dd v ref 1.26v i ref ce ce ce ce ce
advanced analog technology, inc. ? x?w?t??ta?|3--?q ? ? advanced analog technology, inc . ? page 7 of 17 v 1.0 aat1110 application circuit buck (step-down) dd v dd v scp c dd v dd v
advanced analog technology, inc. ? x?w?t??ta?|3--?q ? ? advanced analog technology, inc . ? page 8 of 17 v 1.0 aat1110 buck (step-down) timing chart 2.47v lockout free output scp 1.262v osc oe ldle period setting voltage reference input for short circuit soft-start setting voltage t scp t s output short circuit soft-start out put short circuit dd v
advanced analog technology, inc. ? x?w?t??ta?|3--?q ? ? advanced analog technology, inc . ? page 9 of 17 v 1.0 aat1110 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 10 of 17 v 1.0 aat1110 tape and reel 8-pinsop
advanced analog technology, inc. ? x?w?t??ta?|3--?q ? ? advanced analog technology, inc . ? page 11 of 17 v 1.0 aat1110 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 12 of 17 v 1.0 aat1110 package dimension tssop-8
advanced analog technology, inc. ? x?w?t??ta?|3--?q ? ? advanced analog technology, inc . ? page 13 of 17 v 1.0 aat1110 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, tie ba r burrs and gate burrs. mold flash, tie bar b u 0.006? [0.15 millimeters] per end. dimension ?e1? does not include interlead flash. interlead fl a millimeters] per side. 4. dimension ?b? does not include dambar protrusion. allowable dambar protrusion shall be 0.0 0 ?b? dimension at maximum material condition. dambar cannot be located on the lower radius o 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 14 of 17 v 1.0 aat1110 tape and reel tssop-8
advanced analog technology, inc. ? x?w?t??ta?|3--?q ? ? advanced analog technology, inc . ? page 15 of 17 v 1.0 aat1110 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 16 of 17 v 1.0 aat1110 part marking sop8 top marking aat1110 xxxxxx sop8 back marking yyww part marking tssop8 top marking aat1110 xxxxxx tssop8 back marking yyww
advanced analog technology, inc. ? x?w?t??ta?|3--?q ? ? advanced analog technology, inc . ? page 17 of 17 v 1.0 aat1110 ordering information

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