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ap2331 0.2a single channel current-limited load switch ap2331 document number: ds35529 rev. 4 - 2 1 of 11 www.diodes.com may 2012 ? diodes incorporated new product description the ap2331 is single channel curr ent-limited integrated high-side power switches optimized for hot -swap applications. the devices have fast short-circuit response time for improved overall system robustness and provide a complete protection solution for application subject to heavy capacitiv e loads and the prospect of short circuit. it offers reverse-current blocking, ov er-current, over-temperature and short-circuit protection, as well as controlled rise time and under- voltage lockout functionality. the device is available in sot23 and sc59 packages. features ? input voltage range: 2.7v ? 5.2v ? fast short-circuit response time ? 0.4a accurate current limiting ? 250m? on-resistance ? reverse-current blocking ? built-in soft-start with 0.7ms typical turn-on time ? over-current protection ? over-voltage protection ? short-circuit and thermal protection ? esd protection: 3kv hbm, 300v mm ? ambient temperature range: -40c to +85c ? available in ?green? molding compound (no br, sb) ? totally lead-free & fully rohs compliant (notes 1 & 2) ? halogen and antimony free. ?green? device (note 3) ? ul recognized, file number e322375 ? iec60950-1 cb scheme certified pin assignments applications ? lcd tvs & monitors ? set-top-boxes, residential gateways ? laptops, desktops, servers ? printers, docking stations, hubs ? smart phones, e-readers notes: 1. no purposely added lead. fully eu directiv e 2002/95/ec (rohs) & 2011/6 5/eu (rohs 2) compliant. 2. see http://www.diodes.com for more in formation about diodes incorpor ated?s definitions of halogen- and antimony-free, "gree n" and lead-free. 3. halogen- and antimony-free "green? products are defined as those which contain <900ppm bromine, <900ppm chlorine (<1500ppm total br + cl) and <1000ppm antimony compounds typical application circuit 0.1f in gnd out power supply 2.7v to 5.2v load 0.1f (top view) (top view) sc59 sot23 in in gnd gnd out out
ap2331 0.2a single channel current-limited load switch ap2331 document number: ds35529 rev. 4 - 2 2 of 11 www.diodes.com may 2012 ? diodes incorporated new product pin descriptions pin name pin number descriptions gnd 1 gnd out 2 switch output pin in 3 voltage input pin absolute maximum ratings symbol parameter ratings units esd hbm human body model esd protection 3 kv esd mm machine model esd protection 300 v v in input voltage relative to gnd 6.5 v v out output voltage relative to gnd v in +0.3 v i load maximum continuous load current internal limited a t jmax maximum junction temperature 150 c t st storage temperature range (note 4) -65 to +150 c note: 4. ul recognized rating from -30c to +70c (diodes qualified t st from -65c to +150c) recommended operating conditions symbol parameter min max units v in input voltage relative to gnd 2.7 5.2 v i out output current 0 0.2 a t a operating ambient temperature -40 +85 c
ap2331 0.2a single channel current-limited load switch ap2331 document number: ds35529 rev. 4 - 2 3 of 11 www.diodes.com may 2012 ? diodes incorporated new product electrical characteristics (t a = 25c, v in = +5.0v, unless otherwise stated.) symbol parameter test conditions (note 5) min typ. max unit v uvlo input uvlo v in rising 2.35 2.65 v i q input quiescent current above uvlo, i out = 0 85 125 a i rev reverse leakage current v in = 0v, v out = 5v, i rev at v in 0.01 0.10 a r ds(on) switch on-resistance v in = 5v, i out = 0.2a 100 250 350 m ? i limit over-load current limit v in = 5v, v out = 4v 0.3 0.4 0.5 a i os short-circuit current out shorted to ground 0.3 0.4 0.5 a i rocp reverse-current trigger point v in = 5.0v, v out = 5.2v 0.20 0.25 a t trig deglitch time from reverse current trigger to mosfet turn off (note 6) 0.5 0.7 1.0 ms v ovp output over-voltage trip point (note 7) 5.3 5.6 v t ovp debounce time from output over-voltage to mosfet turn off 15 s v rec recovery after turn-off from rocp and ovp 101% v in t on output turn-on time (note 8) c l = 0.1f, r load = 20 ? (uvlo to 90% v out-nom ) 0.7 ms t shdn thermal shutdown threshold v in = 2.7v to 5.2v 150 c t hys thermal shutdown hysteresis 20 c ja thermal resistance junction-to-ambient (note 9) sot23 215 o c/w sc59 255 o c/w notes: 5. pulse-testing techniques maintain junction temperature close to ambient temper ature; thermal effects must be taken in to account separately. 6. when reverse current triggers at i rocp = 0.20a, the reverse current is continuously clamped at i rocp for 0.7ms deglitch time until mosfet is turned off. 7. during output over-voltage protection, the output draws approximately 60a current. 8. since the output turn-on slew rate is dependent on input su pply slew rate, this limit is only applicable for input supply slew rate between v in /0.2ms to v in /1ms. 9. device mounted on fr-4 substrate pcb, 2oz copper, with minimum recommended pad layout.
ap2331 0.2a single channel current-limited load switch ap2331 document number: ds35529 rev. 4 - 2 4 of 11 www.diodes.com may 2012 ? diodes incorporated new product typical performance characteristics uvlo increasing 1ms/div uvlo decreasing 5ms/div over-load current limit 5ms/div short-circuit current limit 100s/div deglitch time from reverse-current trigger to mosfet turn-off 200s/div reverse-current limit 200s/div 550 s 200m a
ap2331 0.2a single channel current-limited load switch ap2331 document number: ds35529 rev. 4 - 2 5 of 11 www.diodes.com may 2012 ? diodes incorporated new product typical performance characteristics (cont.) output over-voltage trip point 10ms/div output turn-on time 200s/div -40 -20 0 20 40 60 80 ambient temperature ( c) fig. 1 quiescent supply current vs. ambient temperature 0 20 40 60 80 100 120 140 v = 5.2v in v = 5v in v = 3.3v in v = 2.7v in supply current (a) -40 -20 0 20 40 60 80 ambient temperature ( c) fig. 2 short circuit current limit vs. ambient temperature 0.388 0.390 0.392 0.394 0.396 0.398 0.400 0.402 s h o r t c i r c u i t c u r r e n t (ma) 0.404 0.406 0.408 v = 2.7v in v = 3.3v in v = 5v, in v = 5.2v in c = 10f l 2.5 3.0 3.5 4.0 4.5 5.0 5.5 input voltage (v) fig. 3 output turn on-time vs. input voltage o u t p u t t u r n o n - t ime (ms) 0.20 0.25 0.30 0.35 0.40 0.45 c = 1f r = 5 l l v = 5.5v in v = 5v in v = 3.3v in v = 2.7v in -40 -20 0 20 40 60 80 ambient temperature ( c) fig. 4 switch on-resistance vs. ambient temperature 0 50 100 150 200 250 300 o n -s t a t e r esis t a n c e (m ) 350 400 450 500 ovp at 5.4v ovp recovery at 5.1v c l =0.1f rload=20 ?
ap2331 0.2a single channel current-limited load switch ap2331 document number: ds35529 rev. 4 - 2 6 of 11 www.diodes.com may 2012 ? diodes incorporated new product typical performance characteristics (cont.) -40 -20 0 20 40 60 80 ambient temperature ( c) fig. 5 current limit trip threshold vs. ambient temperature 0.388 0.390 0.392 0.394 0.396 0.398 0.400 0.402 s u p p l y c u r r en t (a) 0 50 100 150 200 250 300 r eve r se c u r r en t limi t (ma) 350 400 450 500 -40 -20 0 20 40 60 80 ambient temperature ( c) fig. 6 reverse current limit vs. ambient temperature v = 5v in v = 3.3v in v = 2.7v in
ap2331 0.2a single channel current-limited load switch ap2331 document number: ds35529 rev. 4 - 2 7 of 11 www.diodes.com may 2012 ? diodes incorporated new product application information under-voltage lockout (uvlo) under-voltage lockout function (uvlo) guarantees that the internal power switch is initially off during start-up. the uvlo functions only when the power supply has reached at least 2.5v (typ). whenever the input voltage falls below approximately 2.5v, the power switch is turned off. this facilitates the design of hot-insertion systems where it is not possible to turn off the power switch before input power is removed. over-current and short-circuit protection an internal sensing fet is empl oyed to check for over current conditions. unlike current-sense re sistors, sense fets do not increase the series resistance of the current path. when an over current condition is detected, the device maintains a constant output current and reduces the output voltage accordingly. complete shutdown occurs only if the fault stays long enough to activate thermal limiting. the different overload conditions and the corresponding response of the ap2331 are outlined below: s.no conditions explanation behavior of the ap2331 1 short-circuit condition at start-up output is shorted before input voltage is applied or before the part is powered up. the ic senses the short ci rcuit and immediately clamps output current to a certain safe level namely i limit 2 short-circuit or over current condition short-circuit or overload condition that occurs when the part is powered up and above uvlo. ? at the instance the overload occurs, higher current may flow for a very short period of time before the current limit function can react. ? after the current limit function has tripped (reached the over-current trip threshold), the device switches into current limiting mode and the current is clamped at i limit . 3 gradual increase from nominal operating current to i limit load increases gradually until the current-limit threshold. the current rises until i limit . once the threshold has been reached, the device switches into its current limiting mode and is clamped at i limit . reverse-current protection the usb specification does not a llow an output device to source current back into the usb port. in a normal mosfet switch, current will flow in reverse dire ction (from the output side to the input side) when the output side voltage is higher than the input side. a reverse current limit feature is implemented in the ap2331 to limit such back currents. revers e current limit is always active in ap2331. reverse current is limited at irocp level and when the fault exists for more than 700s, output device is disabled and shutdown. this is called the "deglitch time from reverse current trigger to mosfet turn off?. recovery from irocp occurs when the output voltage falls to 101% of input voltage. over-voltage protection the device has an output over-voltage protection that triggers when the output voltage reaches 5.3v(min). when this fault condition stays on for longer than 15s, (this is called the ?debounce time from output over-voltage to mosfet turn off?) output device is disabled and shut down. recovery from rovp occurs when the output voltage falls to 101% of input voltage. thermal protection thermal protection prevents the ic from damage when the die temperature exceeds safe margins. this mainly occurs when heavy-overload or short-circuit f aults are present for extended periods of time. the ap2331 impl ements a thermal sensing to monitor the operating junction temperature of the power distribution switch. once the die temperature rises to approximately +150c, the thermal protection feature gets activated as follows: the internal thermal sense circuitry turns the power switch off thus preventing the power switch from damage. hysteresis in the thermal sense ci rcuit allows the device to cool down to approximately +20c before the output is turned back on. this built-in thermal hysteresis feature is an excellent feature, as it avoids undesirable oscillations of the thermal protection circuit. the switch continues to cycle in this manner until the load fault is removed, resulting in a pulsed output. discharge function when input voltage falls below uv lo, the discharge function is active. the output capacitor is discharged through an internal nmos that has a discharge resistance of 800 ? . hence, the output voltage drops down to zero. the time taken for discharge is dependent on the rc time constant of the resistance and the output capacitor. discharge time is calculated when uvlo falling threshold is reached to output voltage reaching 300mv. power dissipation and junction temperature the low on-resistance of the internal mosfet allows the small surface-mount packages to pass large current. using the maximum operating ambient temperature (t a ) and r ds(on) , the power dissipation can be calculated by: p d = r ds(on) i 2 finally, calculate the junction temperature: t j = p d x r ja + t a where: t a = ambient temperature c r ja = thermal resistance p d = total power dissipation
ap2331 0.2a single channel curr ent-limited load switch ap2331 document number: ds35529 rev. 4 - 2 8 of 11 www.diodes.com may 2012 ? diodes incorporated new product ordering information (cont.) ap 2331 x - 7 7 : tape & reel package packing sa : sot23 w : sc59 device package code packaging (note 10) 7? tape and reel quantity part number suffix ap2331sa-7 sa sot23 3000/tape & reel -7 AP2331W-7 w sc59 3000/tape & reel -7 note: 10. pad layout as shown on diodes inc. suggested pad la yout document ap02001, which can be found on our website at http://www.diodes.com /datasheets/ap02001.pdf. marking information (1) sot23 device package identification code ap2331sa-7 sot23 kj (2) sc59 1 2 3 xx y w x ( top view ) xx : identification code w : week : a~z : 1~26 week; x : a~z : internal code y : year 0~9 a~z : 27~52 week; z represents 52 and 53 week device package identification code AP2331W-7 sc59 kn
ap2331 0.2a single channel curr ent-limited load switch ap2331 document number: ds35529 rev. 4 - 2 9 of 11 www.diodes.com may 2012 ? diodes incorporated new product package information (all dimensions in mm) package type: (1) sot23 (2) sc59 sot23 dim min max typ a 0.37 0.51 0.40 b 1.20 1.40 1.30 c 2.30 2.50 2.40 d 0.89 1.03 0.915 f 0.45 0.60 0.535 g 1.78 2.05 1.83 h 2.80 3.00 2.90 j 0.013 0.10 0.05 k 0.903 1.10 1.00 k1 - - 0.400 l 0.45 0.61 0.55 m 0.085 0.18 0.11 0 8 - all dimensions in mm sc59 dim min max typ a 0.35 0.50 0.38 b 1.50 1.70 1.60 c 2.70 3.00 2.80 d - - 0.95 g - - 1.90 h 2.90 3.10 3.00 j 0.013 0.10 0.05 k 1.00 1.30 1.10 l 0.35 0.55 0.40 m 0.10 0.20 0.15 n 0.70 0.80 0.75 0 8 - all dimensions in mm a m j l d f b c h k g k1 a m j l d b c h k g n
ap2331 0.2a single channel curr ent-limited load switch ap2331 document number: ds35529 rev. 4 - 2 10 of 11 www.diodes.com may 2012 ? diodes incorporated new product suggested pad layout (1) sot23 (2) sc59 dimensions value (in mm) z 2.9 x 0.8 y 0.9 c 2.0 e 1.35 dimensions value (in mm) z 3.4 x 0.8 y 1.0 c 2.4 e 1.35 x e y c z x e y c z
ap2331 0.2a single channel curr ent-limited load switch ap2331 document number: ds35529 rev. 4 - 2 11 of 11 www.diodes.com may 2012 ? diodes incorporated new product important notice diodes incorporated makes no warranty of any kind, express or implied, with regards to this document, including, but not limited to, the implied warranties of merchantability and fitness for a particular purpose (and their equivalents under the laws of any jurisdiction). diodes incorporated and its subsidiaries reserve the right to make modifications, enhancements, improvements, corrections or ot her changes without further notice to this document and any product described herein. diodes incorporated does not assume any liabi lity arising out of the application or use of this document or any product described herein; neither does diodes incorporated convey any license under its patent or trademark rights, nor the rights of others. any customer or user of this document or products desc ribed herein in such applications shall assume all risks of such use and will agree to hold diodes incorporated and all the companies whose products are represented on diodes incorporated website, harmless against all damages. diodes incorporated does not warrant or accept any liability whatsoever in respect of any products purchased through unauthoriz ed sales channel. should customers purchase or use diodes incorporated products for any unintended or unauthorized application, customers shall indemnify and hold diodes incorporated and its representatives harmless against all claims, damages, expenses, and attorney fee s arising out of, directly or indirectly, any claim of personal injury or death associated with such unintended or unauthorized a pplication. products described herein may be covered by one or more united states, international or foreign patents pending. product names and markings noted herein may also be covered by one or more united states, international or foreign trademarks. life support diodes incorporated products are specifically not authorized for use as critical components in life support devices or systems without the express written approval of the chief executive officer of diodes incorporated. as used herein: a. life support devices or systems are devices or systems which: 1. are intended to implant into the body, or 2. support or sustain life and whose failure to perform when properly used in accordance with instructions for use provided in the labeling can be reasonably expected to result in significant injury to the user. b. a critical component is any component in a life support device or system whose failure to perform can be reasonably expected to cause the failure of the life support device or to affect its safety or effectiveness. customers represent that they have all necessary expertise in the safety and regulatory ramifications of their life support dev ices or systems, and acknowledge and agree that they are solely responsible for all legal, regulatory and safety-related requirements concerning their products and any use of diodes incorporated products in such safety-critical, life support devices or systems, notwithstanding any devices- or systems-related information or support that may be provided by diodes incorporated. further, customers must fully indemnify diodes incorporated and its representatives against any damages arising out of the use of diodes incorporated products in such safety-critical, life support devices or systems. copyright ? 2012, diodes incorporated www.diodes.com

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