advanced power electronics corp. APE8876 1.6x linear fan driver with vout fully on control features descriptioon low dropout voltage: 200mv@0.6a vo follows 1.6 times of vset pin to turn vo fully on stable with low esr ceramic capacitors current-limit and thermal shutdown protection tsot-26 & so-8 pb-free package ordering / package information data and specifications subject to change without notice 1 201103042 typical application the APE8876 is a low dropout linear regulator which is designed to power a dc fan and delivers up to 600ma output current. the output voltage follows the 1.6 times of vset voltage and typical dropout voltage is only 200mv (typical) at 600ma output current. the vset voltage can form 0.1v to 3.3v to guarantee vout 1.6 times of vset. a fon pin turns vout output fully on when given low. the features of current limit (with fold back current) and over temperature protection protect the device against current over-loads and over temperature. the APE8876 is available in a tsot-26 & so-8 package. fon c1 2.2uf vout=1.6 x v set vin=5v u1 APE8876 vin gnd vset fon vo c2 2.2uf fon vset fan (top view) tsot-26 3 2 6 4 1 vout gnd vin 5 vset gnd fon ( top view ) 1 2 3 4 8 7 6 5 vout so-8 vin fon gnd vset gnd gnd gnd package type ty : tsot-26 m : so-8 APE8876x
advanced power electronics corp. APE8876 absolute maximum ratings (at t a =25 o c) vin supply voltage (v in ) ------------------------- - -0.3 to 6.5v fon voltage (v fon ) -------------------------------- - -0.3 to vin vset voltage (v set ) ------------------------------- -0.3 to vin power dissipation (p d ) ---------------------------- - internally limited storage temperature range (t st ) ------------- - -65 to +150c junction temperature range (t j ) -------------- -40 to +125c operating temperature range (t op ) ---------- - -40 to +85c tsot-26 50c/w so-8 25c/w tsot-26 100c/w so-8 70c/w note: rth ja is measured with the pcb copper area approximately 1.5 in 2 (multi-layer) that connect to gnd pins. (v set = 2v, v in = 5v, i out = 0.5a, c in =c out =2.2uf, t a =25 o c unless otherwise specified) parameter sym test condition min typ max units vin supply voltage range v in 4.5 - 6 v quiescent current i ccq no load - 50 80 ua output voltage/v set voltage v o /v set v in =5.5v, v set =1v~3.3v 1.552 1.6 1.648 v/v line regulation v in =4.5v to 5.5v - 0.2 0.5 % load regulation i out =10ma ~ 0.6a - 30 60 mv dropout voltage v drop i out =0.6a, v set =3.3v - 200 320 mv current limit i limt 700 - - ma short circuit current i short vo<0.6v - 250 - ma vset voltage range v set 0.1 - 3.3 v vset pin current i set v set =5v - 80 200 na v fon-h normal operating 2 - - v v fon-l regulator fully on - - 0.8 v i fonh = v in - 0.003 0.1 i fonl = 0v - 1 5 thermal shutdown temp t sd - 150 - c thermal shutdown hysteresis - 30 - c pin bias current a 2 electrical specifications thermal resistance from junction to ambient(rth ja ) thermal resistance from junction to case(rth jc ) pin logic threshold voltage fon fon fon fon
advanced power electronics corp. APE8876 pin descriptions pin symbol pin description vin ic power supply pin. fon input. pulling this pin below 0.4v turns the regulator fully on. internally pulled high. this pin sets the output voltage. its voltage can form 0.1v to 3.3v to guarantee vout 1.6 times of vset gnd ground pin vout output pin. its voltage is 1.6 times of vset block diagram function descriptions output voltage regulation fully-on control 3 vset fon the output voltage is set by vset voltage. vout output voltage follows the 1.6 times of vset voltage until it reaches vin voltage. if the fon pin logic level smaller than 0.8v, the output voltage can be promoted near to vin voltage. otherwise, vout is normal operating by fon larger than 2.0v. current limit and short protection - + vin vout gnd error amp thermal shutdown v o fully on logic vset fon
advanced power electronics corp. APE8876 function descriptions current-limit short current protection thermal shutdown application information capacitor selection thermal considerations 4 the APE8876 monitors the current via the output pmos and limits the maximum current to prevent load and APE8876 from damages during overload or short circuit conditions. when the output voltage drops below 0.6v (typical), which is caused by over load or short circuit, the fold back current limit circuitry limits the output current to 250ma. the fold back current limit is used to reduce the power dissipation during short circuit condition. a thermal shutdown circuit limits the junction temperature of APE8876. when the j unction temperature exceeds +150c, a thermal sensor turns off the output pmos, allowing the device to cool down. the regulator regulates the output again through initiation of a new soft-start cycle after the junction temperature cools by 30c, resulting in a pulsed output during continuous thermal overload conditions. normally, use a 2.2f capacitor on the input and a 2.2f capacitor on the output of the APE8876. in order to insure the circuit stability, the proper output capacitor value should be larger than 1uf. with x5r and x7r dielectrics, 2.2uf is sufficient at all operating temperatures. the APE8876 series can deliver a current of up to 600ma over the full operating j unction temperature range. however, the maximum output current must be dated at higher ambient temperature to ensure the junction temperature does not exceed 125 c. with all possible conditions, the junction temperature must be within the range specified under operating conditions. power dissipation can be calculated based on the output current and the voltage drop across regulator. p d = (v in - v out ) i o the final operating junction temperature for any set of conditions can be estimated by the following thermal equation: p d (max) = (t j (max) - t a ) / rth ja where t j (max) is the maximum junction temperature of the die (125c) and t a is the maximum ambient temperature. the junction to ambient thermal resistance (rth ja ) for tsot-26 package at recommended minimum footprint is 100c/w.
advanced power electronics corp. APE8876 function descriptions pcb layout pcb layout guide 5 1. please place the input capacitors close to the vin 2. ceramic capacitors for load must be placed near the load as close as possible 3. to place APE8876 and output capacitors near the load is good for performance. 4. large current paths that vin and output lines must have wide tracks. 5. gnd connect large copper area can reduced ic temperature. (top view) (bottom view)
advanced power electronics corp. APE8876 typical performance characteristics 6
advanced power electronics corp. APE8876 typical performance characteristics 7 fully on line transient line transient
advanced power electronics corp. APE8876 typical performance characteristics 8 power on
advanced power electronics corp. APE8876 marking information tsot-26 so-8 9 hdyws part number : hd year : a = 2010 1 = 2011 week: a~z : 01~26 a~z : 27~52 id code : internal 8876m ywwsss part number date code (ywwsss) y last digit of the year ww week sss sequence package code
package outlines e1 e e e1 b d a a1 a2 y l1 r l c l2 a - - 1.10 - - 0.043 a1 0.00 - 0.10 0 - 0.004 a2 0.70 0.90 1.00 0. 028 0.035 0.039 b 0.30 0.40 0.50 0. 012 0.016 0.020 c 0.08 0.14 0.20 0. 003 0.006 0.008 d 2.80 2.90 3.00 0. 110 0.114 0.118 e 2.60 2.80 3.00 0. 102 0.110 0.118 e1 1.50 1.60 1.70 0. 059 0.063 0.067 e 0.95 bsc. 0.037 bsc. e1 1.90 bsc. 0.075 bsc. l 0.30 0.45 0.60 0. 012 0.018 0.024 l1 0.60 ref. 0.024 ref. l2 0.25 bsc. 0.010 bsc. y - - 0.10 - - 0.004 r 0.10 - - 0.004 - - 0 o - 8 o 0 o - 8 o jedec outline: mo-193 aa
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