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rev. 1.0 august 2011 www.aosmd.com page 1 of 14 AOZ1401DI li+ charger protection ic general description the aoz1401 is an integrated li+ charger protection ic that protects against input over-voltage, input over- current, and battery over-voltage conditions. when the device detects an input over-voltage condition, it disconnects output from input by turning off the internal mosfet switch, preventing damage of the charger. when the device detects a battery over-voltage condition, it also turns off the internal mosfet to prevent battery from being over-charged. in the case of an over- current condition, it limits the input current at the current limit level set by an external resistor, and if the over- current persists, it turns off the internal mosfet after a blanking period. the thermal shutdown feature adds another layer of protection. the fault status indicator provides status information about fault conditions to the host. the aoz1401 is available in a 2mm x 2mm 8-pin dfn package and is rated over a -40c to +85c ambient temperature range. features ? provides protection for three variables: ? input over-voltage ? user-programmable input over-current ? battery over-voltage ? 30v maximum input voltage ? supports up to 1.5a input current ? high immunity against false triggering due to voltage spikes ? robust against false triggering due to current transients ? thermal shutdown ? status indication, fault condition ? available in space-saving small 8 lead 2x2 dfn applications ? smart phones ? pdas ? mp3 players ? low-power handheld devices ? bluetooth headsets typical application charger end system ac adaptor 8 6 4 5 2 7 1 vin out vbat faultb enb vdc c1 1f r5 25k ilim gnd aoz1401 r3 47k r4 100k r2 47k r1 47k c2 1f
AOZ1401DI rev. 1.0 august 2011 www.aosmd.com page 2 of 14 ordering information all aos products are offered in packages with pb-free plating and compliant to rohs standards. parts marked as green products (with ?l? suffix) use reduced levels of halogens, and are also rohs compliant. please visit www.aosmd.com/web/quality/rohs_compliant.jsp for additional information. pin configuration pin description part number ambient temperature range package environmental AOZ1401DI -40c to +85c 2 x 2 dfn-8 rohs compliant 1 2 3 4 8 7 6 5 out ilim vbat enb top view (dfn 2x2) AOZ1401DI vin gnd nc faultb pin name pin number i/o description vin 1 i input power, connect to external dc supply. connect external 1 f (minimum) to gnd gnd 2 ground terminal nc 3 these pins may have internal circuits used for test purposes. do not make any external connections at these pins for normal operation. faultb 4 o open-drain output, device status. faultb = lo indicates that the input fet has been turned off due to input over-voltage or input over-current conditions, or because the battery voltage is outside safe limits. enb 5 i chip enable input. active low. when enb = hi, the input fet is off. internally pulled down. vbat 6 i battery voltage sense input. connect to pack positive terminal through a resistor. ilim 7 i/o input over-current threshold programming. connect a resistor to gnd to set the over-current threshold. out 8 o output terminal to the charging system. connect external 1 f capacitor (minimum) to gnd thermal pad there is an internal electrical connection between the exposed thermal pad and the gnd pin of the device. the thermal pad must be connected to the same potential as the gnd pin on the printed circuit board. do not use the thermal pad as the primary ground input for the device. gnd pin must be connected to ground at all times.
AOZ1401DI rev. 1.0 august 2011 www.aosmd.com page 3 of 14 absolute maximum ratings (1) note: 1. stresses beyond those listed under absolute maximum ratings may cause permanent damage to the device. these are stress ratings only, and functional operation of the device at these or any other conditions beyond those indicated under recommended operating conditions is not implied. exposure to absolute-maximum-rated conditions for extended periods may affect device reliability. all voltage values are with respect to the network ground terminal unless otherwise noted. recommended operating conditions parameter pin name rating input voltage vin (with respect to gnd) ?0.3v to 30v input voltage out(with respect to gnd) ?0.3v to 12v input voltage ilim, faultb, enb, vbat (with respect to gnd) ?0.3v to 7v input current vin 2.0a output current out 2.0a output sink current faultb 15ma junction temperature, t j ?40c to 150c storage temperature, t stg ?65c to 150c lead temperature (soldering, 10 seconds) 300c esd (human body model) 2kv esd (machine model) 200v parameter conditions min. max. units v vin vin voltage range 3.3 26 v i vin input current, vin pin 1.5 a i out current, out pin 1.5 a r ilim ocp programming resistor 15 90 k t j junction temperature 0 125 c
AOZ1401DI rev. 1.0 august 2011 www.aosmd.com page 4 of 14 electrical characteristics t a = 25c and vin = 5v, unless otherwise stated. specifications in bold are guaranteed by design for ambient temperature range of -40c to +85c symbol parameter test conditions min. typ. max. units vin v uvlo under-voltage lock-out, input power detected threshold enb = lo 2.6 2.7 2.8 v v hys-uvlo hysteresis on uvlo enb = lo 260 mv t dgl(pgood) deglitch time, input power detected status enb = lo 8 ms i dd operating current enb = lo, no load on out pin, vin = 5.0v, r ilim = 25k 400 500 a i stdby standby current enb = hi, r ilim = 25k 70 95 a input to output characteristics v do drop-out voltage vin to out enb = lo, i out = 1a 300 mv input over-voltage protection v ovp input over-voltage protection threshold enb = lo 5.67 5.85 6.00 v t pd(ovp) input ov propagation delay enb = lo 1 s v hys-ovp hysteresis on ovp enb = lo or hi 60 mv t on(ovp) recovery time from input over-voltage condition enb = lo 8 ms input over-current protection input over-current protection threshold range enb = lo 300 1500 ma i ocp input over-current protection threshold enb = lo, r ilim = 25k 930 1000 1070 ma k ilim current limit programming: i ocp = k ilim / r ilim 25 k t blank(ocp) blanking time, input over-current detected enb = lo 176 s t on(ocp) recovery time from input over-current condition enb = lo 64 ms battery over-range protection bv ovp battery over-voltage protection threshold enb = lo, vin > 4.4v 4.30 4.35 4.4 v v hys-bovp hysteresis on bv ovp enb = lo, vin > 4.4v 270 mv i vbat input bias current on vbat pin 20 na t dgl(bovp) deglitch time, battery over-voltage detected enb = lo 176 s thermal protection t j(off) thermal shutdown temperature 140 c
AOZ1401DI rev. 1.0 august 2011 www.aosmd.com page 5 of 14 functional block diagram figure 1. simplified block diagram t j(off-hys) thermal shutdown hysteresis 20 c logic levels on enb v il logic low input voltage 0 0.4 v v ih logic high input voltage 1.4 v i il enb = 0v 1 a i ih enb = 1.8v 15 a logic levels on faultb v ol output low voltage i sink = 5ma 0.2 v i hi-z leakage current v faultb = 5v 10 a electrical characteristics (continued) t a = 25c and vin = 5v, unless otherwise stated. specifications in bold are guaranteed by design for ambient temperature range of -40c to +85c symbol parameter test conditions min. typ. max. units vin enb 2.70v input ovp comp 5.85v bias gen control logic driver ocp battery ovp comp 4.35v out vbat faultb ilim uvlo comp
AOZ1401DI rev. 1.0 august 2011 www.aosmd.com page 6 of 14 functional characteristics vin vout iout vin vout vin vout vin vout iout vin vout iout vin vout iout figure 2. normal power-on showing soft-start, r out = 6.6 figure 3. ovp at power-on, v in = 0v to 9v figure 4. ovp response for input step, v in = 5v to 12v, figure 5. recovery from ovp, v in = 7.5v to 5v figure 6. ocp, powering up into a short circuit on out pin, ocp counter counts to 15 before switching off the device figure 7. ocp, r out switches from 6.6 to 3.3 , shows current limiting and soft-stop faultb faultb faultb faultb faultb
AOZ1401DI rev. 1.0 august 2011 www.aosmd.com page 7 of 14 functional characteristics (continued) typical operating characteristics vbat vout vbat vout figure 8. bat-ovp, v vbat steps from 4.2v to 4.4v figure 9. battery ovp and counter faultb t t faultb 2.40 2.45 2.50 2.55 2.60 2.65 2.70 2.75 2.80 -50 -30 -10 10 30 50 70 90 110 130 temp (c) uvlo (v) increasing decreasing increasing decreasing 0 50 100 150 200 250 300 -50 -30 -10 10 30 50 70 90 110 130 temp (c) drop-out voltage (v) 4v vin 5v vin 0 200 400 600 800 1000 1200 1400 1600 1800 0 20 40 60 80 100 rlim (kohm) ilim (ma) ilim(ma) figure 10. uvlo vs. temperature temp (c) figure 11. drop-out voltage vs. temperature figure 12. over-voltage protection vs. temperature figure 13. ilim vs. rlim 5.70 5.71 5.72 5.73 5.74 5.75 5.76 5.77 5.78 5.79 5.80 -50 -30 -10 10 30 50 70 90 110 130 over voltage protection (v)
AOZ1401DI rev. 1.0 august 2011 www.aosmd.com page 8 of 14 typical operating characteristics (continued) -50 -30 -10 10 30 50 70 90 110 over current battery over voltage protection (v) 0.70 0.75 0.80 0.85 0.90 0.95 1.00 1.05 1.10 1.15 1.20 temp (c) over current protection (a) 4.00 4.05 4.10 4.15 4.20 4.25 4.30 4.35 -50 -30 -10 10 30 50 70 90 110 130 temp (c) increasing decreasing 0.00 0.50 1.00 1.50 2.00 2.50 3.00 3.50 -50 -30 -10 10 30 50 70 90 110 130 temp (c) vbat leakage (na) 0 50 100 150 200 250 300 350 400 450 500 010203040 vin (v) iin (ua) en = l en = h figure 14. over-current protection vs. temperature figure 15. battery over voltage protection vs. temperature figure 16. vbat leakage current vs. temperature figure 17. supply current vs. input voltage leakage
rev. 1.0 august 2011 www.aosmd.com page 9 of 14 AOZ1401DI flow chart power down all ic functions off faultb = hi-z vin >v (uvlo) reset timers reset counters reset faultb = hi-z fet off enb = low vin v (ovp) i iocp v bat batovp t j t j (off) turn on fet faultb = hi-z go to reset turn off fet faultb = low turn off fet faultb = low incr bat counter turn off fet faultb = low incr ocp counter turn off fet faultb = low enb = hi count 15 enb = hi count 15 wait t on(ocp) go to reset any state if vin v (uvlo), go to power down any state if enb = hi, go to reset no yes no no yes yes yes no yes no no no no no yes yes yes no yes
AOZ1401DI rev. 1.0 august 2011 www.aosmd.com page 10 of 14 theory of operation the AOZ1401DI is an integrated li+ charger protection ic that protects against input over-voltage, input over- current, and battery over-voltage conditions. when the device detects an input over-voltage condition, it turns off the internal mosfet, preventing damage of the charger. when the device detects a battery over-voltage condition, it also turns off the internal mosfet to prevent battery from being over-charged. in the case of an over-current condition, it limits the input current at the current limit level set by an external resistor, and if the over-current persists, it turns off the internal mosfet after a blanking period. the thermal shutdown feature adds another layer of protection. the fault status indicator provides status information about fault conditions to the host. under-voltage lockout (uvlo) the under-voltage lockout (uvlo) circuit of AOZ1401DI monitors the input voltage and prevents the output mosfet from turning on until v in exceeds 2.7v. enable the enb pin is the on/off control for the output switch. when the enb pin is driven high, the internal fet is turned off. when the enb pin is low, the fet is turned on. input overvoltage protection the device continuously monitors the input voltage, the input current, and the battery voltage. if the input voltage rises above v ovp , the internal fet is turned off, removing power from the circuit. when the input voltage returns below v ovp , but above v uvlo , the fet is turned on again after a deglitch time of t on (ovp) to ensure that the input supply has stabilized. input overcurrent protection in the case of an over-current condition, AOZ1401DI limits the input current at the current limit level set by an external resistor, and if the over-current persists, it turns off the internal mosfet after a blanking period. the overcurrent threshold is programmed by a resistor r 5 (r ilim ) connected from the ilim pin to vss. figure 13 shows the ocp threshold as a function of r 5 (r ilim ), and may be approximated by the following equation: i ocp = 25 ?? r 5 (r ilim ) (current in a, resistance in k ). battery over-voltage protection the battery overvoltage threshold bvovp is internally set to 4.35v. if the battery voltage exceeds the bvovp threshold, the fet is turned off, and the faultb pin is driven low. faultb the faultb pin is an open drain output that is asserted low when either an input overvoltage, input overcurrent battery overvoltage, or thermal overload condition occurs. thermal shut-down protection the thermal overload protection of AOZ1401DI is engaged to protect the device from damage should the die temperature exceeds safe margins due to a short circuit, extreme loading or heating from external sources. application information input capacitor selection use a 1 f or larger capacitor for input bypassing. this will limit the input voltage drop during output transient conditions. 1 f capacitor should be adequate for most applications; however, higher capacitor values will further reduce the voltage drop. place the bypass capacitor as close to the in pins as feasibly possible. output capacitor selection use a 1 f or larger capacitor between the out and gnd pins. the capacitance does not affect the turn on slew rate; however, a larger capacitor will make the initial turn on transient smoother. selection of r 4 (r vbat ) direct-connecting battery to vbat is not recommended. the voltage at the in pin may appear on the vbat pin if ic fails. connecting the vbat pin through r 4 (r vbat ) prevents a large current from flowing into the battery in case of a failure of the ic, so choose r 4 (r vbat ) value in the range 100k to 470k . selection of r 3 (r en ), r 2 (r faultb ), and r 1 (r pu ) the enb pin can be used to enable and disable the ic. enb pin can be tied to ground or left un-connected, permanently enabling the device, if host is not presented. if host control is required, the enb pin should be connected to the host through as large a resistor as possible. the faultb pin is an open drain output that is asserted low when either an input overvoltage, input overcurrent battery overvoltage, or thermal overload condition occurs. if the application does not require monitoring of
AOZ1401DI rev. 1.0 august 2011 www.aosmd.com page 11 of 14 the faultb pin, it can be left unconnected. but if the faultb pin has to be monitored, it should be pulled high externally through r 1 (r pu ), and connected to the host through r 2 (r faultb ) prevents damage to the host controller if the AOZ1401DI fails. choose the resistors with high values, and values between 22k and 100k should be sufficient. pcb layout guidelines AOZ1401DI uses dfn 2x2 package with a thermal pad. the thermal pad should be thermally coupled with the pcb ground plane for good thermal performance, this will require a copper pad directly under the ic in most applications. this copper pad should be connected to the ground plane with an array of thermal vias. c in , c out , r ilim and r bat should be located close to the ic.
rev. 1.0 august 2011 www.aosmd.com page 12 of 14 AOZ1401DI package dimensions, dfn 2x2-8l top view bottom view side view recommended land pattern notes: 1. dimensions and tolerances conform to asme y14.5m-1994. 2. controlling dimension is millimeter, converted inch dimensions are not necessarily exact. 3. dimension b applied to metallized terminal and is measured between 0.10mm and 0.30mm from the terminal tip. if the terminal has the optional radius on the other end of the terminal, dimension b should not be measured in that radius area. 4. coplanarity ddd applies to the terminals and all other bottom surface metallization. symbols a a1 b c d d1 e e1 e l r aaa bbb ccc ddd dimensions in millimeters min. 0.70 0.00 0.18 1.35 0.75 0.20 nom. 0.75 0.02 0.25 0.20 ref. 2.00 bsc 1.50 2.00 bsc 0.90 0.50 bsc 0.30 0.20 0.15 0.10 0.10 0.08 max. 0.80 0.05 0.30 1.60 1.00 0.40 symbols a a1 b c d d1 e e1 e l r aaa bbb ccc ddd dimensions in inches min. 0.028 0.000 0.007 0.053 0.030 0.008 nom. 0.030 0.001 0.010 0.008 ref. 0.079 bsc 0.059 0.079 bsc 0.035 0.020 bsc 0.012 0.008 0.006 0.004 0.004 0.003 max. 0.031 0.002 0.012 0.063 0.039 0.016 unit: mm e d b e l d1 chamfer 0.2 x 45 a1 seating plane a 0.50 0.25 1.70 1.50 0.30 0.90 0.85 c e1 r bottom view pin #1 id option 2 pin #1 id option 1
rev. 1.0 august 2011 www.aosmd.com page 13 of 14 AOZ1401DI tape and reel dimensions, dfn 2x2-8l carrier tape reel leader / trailer & orientation tape size 8mm reel size ?180 m ?180.00 0.50 package dfn 2x2 a0 2.25 0.05 b0 2.25 0.05 k0 1.00 0.05 d0 1.50 +0.10/-0 d1 1.00 +0.25/-0 e 8.00 +0.30/-0.10 e1 1.75 0.10 e2 3.50 0.05 p0 4.00 0.10 p1 4.00 0.10 p2 2.00 0.10 t 0.254 0.02 n 60.0 0.50 w1 r m s k h n trailer tape 300mm min. components tape orientation in pocket leader tape 500mm min. p1 p0 unit: mm unit: mm a0 b0 t k0 p2 e e2 e1 d0 d1 feeding direction w1 8.4 +1.5/-0.0 h 13.0 0.20 s 1.5 min. k 13.5 min. r 3.0 0.50
rev. 1.0 august 2011 www.aosmd.com page 14 of 14 AOZ1401DI part marking af1a 9b12 part number code underscore denotes green product year code assembly lot code option code assembly location code week code AOZ1401DI (2 x 2 dfn) as used herein: 1. life support devices or systems are devices or systems which, (a) are intended for surgical implant into the body or (b) support or sustain life, and (c) whose failure to perform when properly used in accordance with instructions for use provided in the labeling, can be reasonably expected to result in a significant injury of the user. 2. a critical component in any component of a life support, device, or system whose failure to perform can be reasonably expected to cause the failure of the life support device or system, or to affect its safety or effectiveness. this data sheet contains preliminary data; supplementary data may be published at a later date. alpha & omega semiconductor reserves the right to make changes at any time without notice. life support policy alpha & omega semiconductor products are not authorized for use as critical components in life support devices or systems.

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