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advanced analog technology, inc. ? x?w?t??ta?|3--?q ? ? advanced analog technology, inc . ? page 1 of 21 v 0.1 aat1 401 details are subject to change without notice. four-channel digital still camera power supply features z complete pwm power control circuitry z input voltage range: 3.0v to 6.5v (ch1~ch4) z low start-up voltage: 1.4v (ch4) z separate on/off control for ch1~ch4 z supports synchronous boos t/buck rectification (ch1) z supports synchronous boost rectification (ch4) z supports boost/buck conversion (ch2) z supports boost conversion (ch3) z supports white led driver (ch3) z totem-pole output z short circuit protection z wide operating frequency: 100 khz to 1mhz z lqfp48 and vqfn40 package applications z camcorders z digital cameras z ccd imaging devices general description the AAT1401 provides an integrated four channel pulse-width-modulation (pwm ) solution for the power supply of dc-dc converter; this device offers system engineer flexibility to tailor-make the power supply circuitry for specific applica tions. each channel contains its own error amplifier, pwm comparator, dead-time control (dtc) and output driver. the under-voltage protection, oscillator, short circuit protection and voltage reference circuit are the common features for the four channels. in addition to a boost conversion, AAT1401 also has two synchronous rectification systems with alternatives of a synchronous boost or buck on channel one (ch1) and a boost or buck conversion on channel two (ch2) .
advanced analog technology, inc. ? x?w?t??ta?|3--?q ? ? advanced analog technology, inc . ? page 2 of 21 v 0.1 aat1 401 pin configuration AAT1401 1 AAT1401 1 (vqfn-40) (lqfp-48) function table condition channel status shdn ? sd ch1 ch2 ch3 ch4 ?lo? x off off off off sd1= ?lo? off sd1= ?hi? on sd2= ?lo? off sd2= ?hi? on sd3= ?lo? off sd3= ?hi? on sd4= ?lo? off ?hi? sd4= ?hi? on
advanced analog technology, inc. ? x?w?t??ta?|3--?q ? ? advanced analog technology, inc . ? page 3 of 21 v 0.1 aat1 401 pin description (vqfn-40) pin no name i/o function 1 mc1 i boost or buck select for ch1 2 sd1 i on/off control for ch1 3 sd4 i on/off control for ch4 4 shdn i power on/off control 5 ie1 i inverted input for error amplifier 1 (ea1) 6 ie4 i inverted input for error amplifier 4 (ea4) 7 dtc1 i dead time control of ch1 8 oe1 o output for error amplifier 1 (ea1) 9 dtc4 i dead time control of ch4 10 nc - 11 oe4 o output for error amplifier 4 (ea4) 12 rt - external frequency setting resistor 13 ct - external frequency setting capacitor 14 vb o reference voltage 2.77v output 15 gnd p ground 16 vdd p power supply 17 ref v o reference voltage 1.245v output 18 scp - short circuit protection capacitor connection pin 19 sd3 i on/off control for ch3 20 nc - 21 sd2 i on/off control for ch2 22 ie3a i inverted input 2 for error amplifier 3 (ea3) 23 ie3 i inverted input for error amplifier 3 (ea3) 24 ie2 i inverted input for error amplifier 2 (ea2) 25 oe3 o output for error amplifier 3 (ea3) 26 oe2 o output for error amplifier 2 (ea2) 27 dtc3 i dead time control of ch3 28 dtc2 i dead time control of ch2 29 mc2 i boost or buck select for ch2 30 nc - 31 out2 o ch2 totem pole type output 32 nc - 33 out3 o ch3 totem pole type output 34 out4_2 o ch4 synchronous rectifier side output 35 pgnd p output buffer ground 36 pvdd p output buffer power supply 37 out4_1 o ch4 totem pole type output 38 nc - 39 out1_1 o ch1 totem pole type output 40 out1_2 o ch1 synchronous rectifier side output
advanced analog technology, inc. ? x?w?t??ta?|3--?q ? ? advanced analog technology, inc . ? page 4 of 21 v 0.1 aat1 401 pin description (lqfp-48) pin no. name i/o function 1 nc - 2 nc - 3 mc1 i boost or buck select for ch1 4 sd1 i on/off control for ch1 5 sd4 i on/off control for ch4 6 shdn i power on/off control 7 ie1 i inverted input for error amplifier 1 (ea1) 8 ie4 i inverted input for error amplifier 4 (ea4) 9 dtc1 i dead time control of ch1 10 oe1 o output for error amplifier 1 (ea1) 11 dtc4 i dead time control of ch4 12 nc - 13 oe4 o output for error amplifier 4 (ea4) 14 rt - external frequency setting resistor 15 ct - external frequency setting capacitor 16 nc - 17 vb o reference voltage 2.77v output 18 nc - 19 gnd p ground 20 nc - 21 vdd p power supply 22 ref v o reference voltage 1.245v output 23 scp - short circuit protection capacitor connection pin 24 sd3 i on/off control for ch3 25 nc - 26 sd2 i on/off control for ch2 27 ie3a i inverted input 2 for error amplifier 3 (ea3) 28 ie3 i inverted input for error amplifier 3 (ea3) 29 ie2 i inverted input for error amplifier 2 (ea2) 30 oe3 o output for error amplifier 3 (ea3) 31 oe2 o output for error amplifier 3 (ea2) 32 dtc3 i dead time control of ch3 33 dtc2 i dead time control of ch2 34 mc2 i boost or buck select for ch2 35 nc - 36 nc - 37 out2 o ch2 totem pole type output 38 nc - 39 out3 o ch3 totem pole type output 40 nc - 41 out4_2 o ch4 synchronous rectifier side output 42 pgnd p output buffer ground 43 nc - 44 pvdd p output buffer power supply 45 out4_1 o ch4 totem pole type output 46 nc - 47 out1_1 o ch1 totem pole type output 48 out1_2 o ch1 synchronous rectifier side output
advanced analog technology, inc. ? x?w?t??ta?|3--?q ? ? advanced analog technology, inc . ? page 5 of 21 v 0.1 aat1 401 block diagram
advanced analog technology, inc. ? x?w?t??ta?|3--?q ? ? advanced analog technology, inc . ? page 6 of 21 v 0.1 aat1 401 absolute maximum ratings parameter symbol value unit supply voltage dd v 7 v input voltage ( ? ie , ? dtc , ? sd , shdn) i v dd v v output voltage o v dd v +0.3 v output current o i +20 ma output peak current ( w t2 ?? s, duty 5%) ?? opeak i +200 ma operating temperature range c t 20 ? + j storage temperature range storage t 45 ? + j recommended operating conditions parameter symbol min max unit startup supply voltage, ch4 dd v - 1.4 v supply voltage, dd v ( ch1~ch4) dd v 3.0 6.5 v input voltage, (ie1~ie4) i v 0.28 1.55 v output voltage o v 0 dd v v oscillator capacitor osc c 50 560 pf oscillator resistor (note 1) osc r 10 80 ? k oscillator frequency osc f 100 800 khz output current, (ch1~ch4) o i - 15 ma output current of error amplifier oe i - 60 ? operating free-air temperature c t 20 ? + j
advanced analog technology, inc. ? x?w?t??ta?|3--?q ? ? advanced analog technology, inc . ? page 7 of 21 v 0.1 aat1 401 electrical characteristics, dd v = 5.0v (unless otherwise specified) (see note 1) oscillator parameter symbol test condition min typ max unit frequency osc f osc c = 100pf , osc r = 35 k ? 450 500 550 khz ?hi? level output voltage osch v osc c = 100pf , osc r = 35 k ? 0.927 1.025 1.123 v ?lo? level output voltage oscl v osc c = 100pf , osc r = 35 k ? 0.274 0.323 0.371 v frequency change with dd v v f ? dd v = 3.0v to 6.5v, c t= 25 o c osc c = 100pf, osc r = 35 k ? - 1 5 % frequency change with c t t f ? - 1 - % under voltage protection parameter symbol test condition min typ max unit upper threshold voltage uph v c t= 25 o c 2.53 2.72 2.91 v lower threshold voltage upl v c t= 25 o c - 2.47 - v hysteresis ( uph v ? upl v) hys v c t= 25 o c - 0.25 - v short circuit protection control parameter symbol test condition min typ max unit input threshold voltage t v ch1,2,3,4 1.220 1.245 1.285 v latch reset voltage r v c t= 25 o c - 2.47 - v short-circuit detection threshold voltage tscd v 0.58 0.63 0.68 v scp terminal source current scp i 3.5 ? ? 1.5 ? a note 1: typical values of all parameters except for ref ref v v ? (dev) and t f ? are specified at c t =25 j .
advanced analog technology, inc. ? x?w?t??ta?|3--?q ? ? advanced analog technology, inc . ? page 8 of 21 v 0.1 aat1 401 electrical characteristics, 5.0v v dd = (unless otherwise specified (see note 1) (cont.) reference voltage parameter symbol test conditions min typ max unit reference voltage ref v ma 1 i ref ? = , c t= 25 o c 1.227 1.245 1.263 v short-circuit output current os i = ref v0 35 ? ? 8 ? ma input voltage regulation ri v ma 1 i ref ? = , v dd = 3.0v to 6.5v 10 ? ? = to 1 ? ? ? c t= 20 ? j to +85 j - 0.5 - % ea (error amplifier) parameter symbol test condition min typ max unit v th ch1,2,4, oe=0.7v 1.227 1.245 1.263 v th3 ch3 1.242 1.260 1.278 threshold voltage v th3a ch3 0.352 0.370 0.398 v input bias current ib i ch1,4, i v = 0.28v to 1.55v - 10 20 na input voltage range ir v ch1,4 0.28 - 1.55 v open-loop voltage gain vo a 65 83 - db unity-gain bandwidth 1 bw - 10 - mh z + os v 1.3 - - output voltage swing ? os v - - 0.2 v output sink current + os i oe=0.7v 2.5 5.0 - ma output source current ? os i oe=0.7v - 106 ? 60 ? a
advanced analog technology, inc. ? x?w?t??ta?|3--?q ? ? advanced analog technology, inc . ? page 9 of 21 v 0.1 aat1 401 electrical characteristics, dd v = 5.0v (unless otherwise specified) (see note 1) (cont.) dead-time control parameter test condition min typ max unit input bias current (dtc1~dtc4) bdtc i dtc v = 0.2v to 1.3v - - 200 na d0 v duty = 0%, osc f = 500khz 0.323 0.423 - input threshold voltage (dtc1,2,3) d100 v duty = 100%, osc f = 500khz - 1.125 1.225 v 0 d 4 v duty = 0%, osc f = 500khz 0.223 0.323 - input threshold voltage (dtc4) 100 d 4 v duty = 100%, osc f = 500khz - 1.025 1.125 v output stage parameter test condition min typ max unit 15ma i o ? = (ch1~ch3) - 18 30 r oh 15ma i o ? = (ch4) - 9 15 ? 15ma i o = (ch1~ch3) - 16 25 output on resistor r ol 15ma i o = (ch4) - 9 15 ? shutdown ( ? sd ) parameter test condition min typ max unit high level ? sd h sd active mode 1.4 - - v low level ? sd l sd stand-by mode - - 0.6 v input current ch1~ch4 - 10 20 na operating current parameter test condition min typ max unit off dd i ? shdn=0v - - 10 a ? shdn=?hi?; sd1~sd4= ?hi? - 4.8 7.0 ma
advanced analog technology, inc. ? x?w?t??ta?|3--?q ? ? advanced analog technology, inc . ? page 10 of 21 v 0.1 aat1 401 application circuit ch1 synchronous solution
advanced analog technology, inc. ? x?w?t??ta?|3--?q ? ? advanced analog technology, inc . ? page 11 of 21 v 0.1 aat1 401 application circuit ch1 non-synchronous solution
advanced analog technology, inc. ? x?w?t??ta?|3--?q ? ? advanced analog technology, inc . ? page 12 of 21 v 0.1 aat1 401 application circuit ch2 solution
advanced analog technology, inc. ? x?w?t??ta?|3--?q ? ? advanced analog technology, inc . ? page 13 of 21 v 0.1 aat1 401 application circuit ch3 solution
advanced analog technology, inc. ? x?w?t??ta?|3--?q ? ? advanced analog technology, inc . ? page 14 of 21 v 0.1 aat1 401 application circuit ch4 synchronous solution ch4 non-synchronous solution
advanced analog technology, inc. ? x?w?t??ta?|3--?q ? ? advanced analog technology, inc . ? page 15 of 21 v 0.1 aat1 401 operation conditi on setting
advanced analog technology, inc. ? x?w?t??ta?|3--?q ? ? advanced analog technology, inc . ? page 16 of 21 v 0.1 aat1 401 package dimension vqfn40 package
advanced analog technology, inc. ? x?w?t??ta?|3--?q ? ? advanced analog technology, inc . ? page 17 of 21 v 0.1 aat1 401 package dimension vqfn40 package (cont.)
advanced analog technology, inc. ? x?w?t??ta?|3--?q ? ? advanced analog technology, inc . ? page 18 of 21 v 0.1 aat1 401 package dimension (cont.) vqfn40 package (cont.) dimensions in millimeters dimensions in inches symbol min typ max min typ max a 0.80 0.90 1.00 0.031 0.035 0.039 a1 0.00 0.02 0.05 0 0.0008 0.0020 b 0.225 0.250 0.275 0.009 0.010 0.011 c 0.19 0.20 0.25 0.0075 0.0080 0.0100 d 5.90 6.00 6.10 0.232 0.236 0.240 d2 4.650 4.800 4.950 0.183 0.189 0.195 e 5.90 6.00 6.10 0.232 0.236 0.240 e2 4.650 4.800 4.950 0.183 0.189 0.195 e ----- 0.50 ----- ----- 0.020 ----- l 0.35 0.40 0.45 0.014 0.016 0.018 y 0 ----- 0.076 0 ----- 0.003 note: the terminal #1 identifier is a laser marked feature.
advanced analog technology, inc. ? x?w?t??ta?|3--?q ? ? advanced analog technology, inc . ? page 19 of 21 v 0.1 aat1 401 package dimension lqfp48 package
advanced analog technology, inc. ? x?w?t??ta?|3--?q ? ? advanced analog technology, inc . ? page 20 of 21 v 0.1 aat1 401 package dimension lqfp48 package (cont.)
advanced analog technology, inc. ? x?w?t??ta?|3--?q ? ? advanced analog technology, inc . ? page 21 of 21 v 0.1 aat1 401 package dimension lqfp48 package (cont.) dimensionin millimeters symbol min typ max a ----- ----- 1.60 a1 0.05 ----- 0.15 a2 1.35 1.40 1.45 b 0.17 0.22 0.27 c 0.09 ----- 0.20 e 8.80 9.00 9.20 e1 6.90 7.00 7.10 d 8.80 9.00 9.20 d1 6.90 7.00 7.10 e ----- 0.50 ----- l 0.45 0.60 0.75 l1 ----- 1.00 ----- c 0 o c 5 . 3 o c 0 . 7 o y 0 ----- 0.08

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