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ap7335a 300ma, low quiescent cu rrent, fast transient low dropout linear regulator ap7335a document number: ds35267 rev. 2 - 2 1 of 12 www.diodes.com october 2011 ? diodes incorporated new product description the ap7335a is a 300ma, 5.0v fixed output voltage, low dropout linear regulator with 1% output voltage accuracy. the device included pass element, error amplifier, band-gap, current limit and thermal shutdo wn circuitry. the device is turned on when en pin is set to logic high level. the characteristics of low dropout voltage and low quiescent current make it suitable for low power applications, for example, battery powered devices. the typical quiescent current is 35 a. built-in current-limit and thermal-shutdown functions prevent ic from damage in fault conditions. this device is only available as 5.0v fixed version. please contact your local sales office for any other voltage options. the ap7335a is packaged in sot25 and u-dfn2020-6. applications ? smart phones ? mp3/mp4 ? battery-powered devices ? bluetooth headset ? battery charger ? lcd tv ? multifunction monitors pin assignments features ? 300ma low dropout regulator with en ? very low i q 35a ? fixed output at 5.0v o v in min 5.5v ? high psrr: 65db at 1khz ? fast start-up time 220s ? stable with low esr, 1f ceramic output capacitor ? excellent load/line transient response ? low dropout 150mv at 300ma ? current limit and short circuit protection ? thermal shutdown protection ? ambient temperature range -40oc to 85c ? sot25, and u-dfn2020-6 available in ?green? molding compound (no br, sb) ? lead free finish/ rohs compliant (note 1) note: 1. eu directive 2002/95/ec (rohs). all applicable rohs exemptions applied. please visit our website at http://www.di odes.com/product s/lead_free.html . typical application circuit 1uf in gnd en out enable 1uf v in v out ap7335 fixed output in gnd en out nc 1 2 34 5 out nc nc in gnd en 6 5 4 3 1 2 sot25 (fixed output) u-dfn2020-6 (fixed output)
ap7335a 300ma, low quiescent cu rrent, fast transient low dropout linear regulator ap7335a document number: ds35267 rev. 2 - 2 2 of 12 www.diodes.com october 2011 ? diodes incorporated new product pin descriptions pin name pin number description sot25 (fixed) u-dfn2020-6 (fixed) in 1 3 voltage input pin. bypass to ground through at least 1f mlcc capacitor gnd 2 2 ground en 3 1 enable input, active high adj - - output feedback pin nc 4 5, 6 no connection out 5 4 voltage output pin. bypass to ground through 1f mlcc capacitor functional block diagram in en gnd out gate driver 0.8v current limit and thermal shutdown fixed version r r
ap7335a 300ma, low quiescent cu rrent, fast transient low dropout linear regulator ap7335a document number: ds35267 rev. 2 - 2 3 of 12 www.diodes.com october 2011 ? diodes incorporated new product absolute maximum ratings symbol parameter ratings unit esd hbm human body model esd protection 2000 v esd mm machine model esd protection 200 v v in input voltage 6.5 v out, en voltage v in + 0.3 v continuous load current per channel internal limited t st storage temperature range -65 to 150 c t j maximum junction temperature 150 c stresses greater than the 'absolute maximum ratings' specified a bove, may cause permanent damage to the device. these are stres s ratings only; functional operation of the device at these or any ot her conditions exceeding those indicated in this specification is not implied. device reliability may be affected by exposure to absolute maximum rating conditions for extended periods of time. recommended operating conditions symbol parameter min max unit v in input voltage (note 3) 2 (note 3) 6 v i out output current (note 2) 0 300 ma t a operating ambient temperature -40 85 c notes: 2. the device maintains a stable, regul ated output voltage without a load current. 3. v in(min) = 5.5v for 5.0v, v out at 300ma i out
ap7335a 300ma, low quiescent cu rrent, fast transient low dropout linear regulator ap7335a document number: ds35267 rev. 2 - 2 4 of 12 www.diodes.com october 2011 ? diodes incorporated new product electrical characteristics (t a = 25 o c, v in = 5.5 to 6v, c in = 1 f, c out = 1 f, v en = 2v, unless otherwise stated) symbol parameter test conditions min typ. max unit v out output voltage accuracy t a = -40 o c to 85 o c, i out = 10% of i out-max -1 1 % v out / v in /v line regulation v in = 5.5v to 6v, v en = v in , i out = 1ma 0.02 0.20 %/v v out /v out load regulation v in = 5.5v to 6v, i out = 1ma to 300ma -0.6 0.6 % v dropout dropout voltage (note 4) i out = 300ma 150 200 mv i q input quiescent current v en = v in , i out = 0ma 35 80 a i shdn input shutdown current v en = 0v, i out = 0ma 0.1 1 a i leak input leakage current v en = 0v, out grounded 0.1 1 a t st start-up time v en = 0v to 2.0v in 1 s, i out = 300ma 220 s psrr psrr v in = 5.5v dc + 0.5v ppac , f = 1khz, i out = 50ma 65 db i short short-circuit current v in = v in-min to v in-max , v out < 0.2v (fixed) or 160 ma i limit current limit v in = v in-min to v in-max , v out /r out = 1.2a 400 650 ma v il en input logic low voltage v in = v in-min to v in-max 0.4 v v ih en input logic high voltage v in = v in-min to v in-max 1.4 v i en en input current v in = 0v or v in-max -1 1 a t shdn thermal shutdown threshold 145 c t hys thermal shutdown hysteresis 15 c ja thermal resistance junction-to-ambient sot25 (note 5) 187 o c/w u-dfn2020-6 (note 5) 251 notes: 4. dropout voltage is the voltage diff erence between the input and th e output at which the output voltage drops 2% below its nominal value. 5. test condition for all packages: device mounted on fr-4 substrate pc board, 1oz copper, with minimum recommended pad layout .
ap7335a 300ma, low quiescent cu rrent, fast transient low dropout linear regulator ap7335a document number: ds35267 rev. 2 - 2 5 of 12 www.diodes.com october 2011 ? diodes incorporated new product typical performance characteristics start-up time time (4 0 s/div) start-up time time (4 0 s/div) line transient response time (40 s/div) line transient response time (40 s/div) load transient response time (100 s/div) load transient response time (100 s/div) v out =5.0v (2v/div) with no load v en =0 to 2v (1v/div) v in =5.5v c in =c out =1 f v in =5.5v to 6.0v (1v/div) tr=tf=2 s c in =none, c out =1 f v out =5.0v (10mv/div) i out =30ma(50ma/div) i out =300ma(200ma/div) v out =5.0v (10mv/div) v in =5.5v to 6.0v (1v/div) tr=tf=2 s c in =none, c out =1 f v en =0 to 2v (1v/div) v in =5.5v c in =c out =1 f v out =5.0v (2v/div) with 300ma load v in =v en =5.5v c in =c out =1 f tr=tf=1 s v in =v en =5.5v c in =c out =1 f tr=tf=1 s v out =5.0v (100mv/div) i out =10ma to 300ma (200ma/div) v out =5.0v (100mv/div) i out =10ma to 150ma (200ma/div)
ap7335a 300ma, low quiescent cu rrent, fast transient low dropout linear regulator ap7335a document number: ds35267 rev. 2 - 2 6 of 12 www.diodes.com october 2011 ? diodes incorporated new product typical performance characteristics (cont.) dropout voltage vs output current 0 50 100 150 200 0 50 100 150 200 250 300 output current(ma) dropout voltage(mv) current limit vs temperature 400 500 600 700 800 -50 -25 0 25 50 75 100 125 temperature( ) current limit(ma) short-circuit current vs temperature 100 125 150 175 200 -50 -25 0 25 50 75 100 125 temperature( ) short-circuit current(ma) psrr 0 10 20 30 40 50 60 70 80 0.1 1 10 100 frequency(khz) psrr(db) v in =5.5v v in =5.5v v out =5.0v i out =50ma i out =300ma -45c v out =5.0v 90c 25c v in =5.5v+0.5v ppac v out =5.0v c in =none, c out =1 f t a =25c
ap7335a 300ma, low quiescent cu rrent, fast transient low dropout linear regulator ap7335a document number: ds35267 rev. 2 - 2 7 of 12 www.diodes.com october 2011 ? diodes incorporated new product application note input capacitor a 1 f ceramic capacitor is recommended between in and gnd pins to decouple input power supply glitch and noise. the amount of the capacitance may be increased without limit. this input capacitor must be located as close as possible to the device to assure input stability and reduce noise. for pcb layout, a wide copper trace is required for both in and gnd pins. a lower esr capacitor type allows the use of less capacitance, while higher esr type requires more capacitance. output capacitor the output capacitor is requir ed to stabilize and improve the transient response of t he ldo. the ap7335a is stable with very small ceramic output capacitors. using a ceramic capacitor value that is at least 1 f with esr > 15m ? on the output ensures stability. higher capacitance values help to improve line and load transient response. the output capacitance may be increased to keep low undershoot and overshoot. output capacitor must be placed as close as possible to out and gnd pins. region of stable c out esr vs. load current 0.001 0.01 0.1 1 10 100 0 50 100 150 200 250 300 load current (ma) c out esr ( ? ) no load stability no minimum load is required to keep the device stable. the device will remain stable and regulated in no load condition. on/off input operation the ap7335a is turned on by setting the en pin high, and is turned off by pulling it low. if this feature is not used, the en pin should be tied to in pin to keep the regulator output on at all time. to ensure proper operation, the signal source used to drive the en pin must be able to swing above and below the specified turn-on/off voltage thresholds listed in the electrical characteristics section under v il and v ih . current limit protection when output current at out pin is higher than current limit threshold, the curr ent limit protection will be triggered and clamp the output current to approximately 650ma to prevent over-current and to protect the regulator from damage due to overheating. short circuit protection when out pin is short-circuit to gnd, short circuit protection will be triggered and clamp the output current to approximately 160ma. th is feature protects the regulator from over-current and damage due to overheating. thermal shutdown protection thermal protection disables the output when the junction temperature rises to approximately +145c, allowing the device to cool down. when the junction temperature reduces to approximately +130c the output circuitry is enabled again. depending on power dissipation, thermal resistance, and ambient temperature, the thermal protection circuit may cycle on and off. this cycling limits the heat dissipation of the regulator, protecting it from damage due to overheating. ultra fast start-up after enabled, the ap7335a is able to provide full power in as little as tens of microseconds, typically 220s, without sacrificing low ground current. this feature will help load circuitry move in and out of standby mode in real time, eventually extend battery life for mobile phones and other portable devices. fast transient response fast transient response ldo can extend battery life. tdma-based cell phone protocols such as global system for mobile communications (gsm) have a transmit/receive duty factor of only 12.5 percent, enabling power savings by putting much of the baseband circuitry into standby mode in between transmit cycles. in baseband circuits, the load often transitions virtually instantaneously from 100a to 100ma. to meet this load requirement, the ldo must react very quickly without a large voltage drop or overs hoot ? a requirement that cannot be met with conventional, general-purpose ldo. the ap7335a?s fast transient response from 0 to 300ma provides stable voltage supply for fast dsp and gsm chipset with fast changing load. low quiescent current the ap7335a, consuming only around 35a for all input range, provides great power saving in portable and low power applications. unstable range unstable range stable range v in =5.5v c in =c out =1 f
ap7335a 300ma, low quiescent cu rrent, fast transient low dropout linear regulator ap7335a document number: ds32259 rev. 2 - 2 8 of 12 www.diodes.com october 2011 ? diodes incorporated new product application note (cont.) power dissipation the device power dissipation and proper sizing of the thermal plane that is connected to the thermal pad is critical to avoid thermal shutdown and ensure reliable operation. power dissipation of the device depends on input voltage and load conditions and can be calculated by: p d = (v in - v out ) x i out the maximum power dissipation, handled by the device, depends on the maximum junction to ambient thermal resistance, maximum ambient temperature, and maximum device junction temperature, which can be calculated by the following equation: p d (max@t a ) = ja r ) a t-c145( + ordering information ? ap 7335 a - xx x x - x packing package 7: tape & reel 50 : 5.0v output sn : u-dfn2020-6 ap7335a - xx x - x packing package 7 : tape & reel 50 : 5.0v output w : sot25 device package code packaging (note 6) 7?/13? tape and reel quantity part number suffix ap7335a-xxw-7 w sot25 3000/tape & reel -7 ap7335a-xxsn-7 sn u-dfn2020-6 3000/tape & reel -7 note: 6. pad layout as shown on diodes inc. suggested pad layout document ap02001, which can be found on our website at http://www.diodes .com/datasheets/ap02001.pdf.
ap7335a 300ma, low quiescent cu rrent, fast transient low dropout linear regulator ap7335a document number: ds35267 rev. 3 - 2 9 of 12 www.diodes.com october 2011 ? diodes incorporated new product marking information (1) sot25 1 2 3 5 7 4 xx y w x ( top view ) xx : identification code w : week : a~z : 1~26 week; x : a~z : g = green y : year 0~9 a~z : 27~52 week; z represents 52 and 53 week device package identification code ap7335a-50 sot25 tp (2) u-dfn2020-6 y : year : 0~9 ( top view ) y w x xx xx : identification code x : a~z : g = green w : week : a~z : 1~26 week; a~z : 27~52 week; z represents 52 and 53 week device package identification code ap7335a-50 u-dfn2020-6 tp
ap7335a 300ma, low quiescent cu rrent, fast transient low dropout linear regulator ap7335a document number: ds35267 rev. 3 - 2 10 of 12 www.diodes.com october 2011 ? diodes incorporated new product package outline dimensions (cont.) (1) package type: sot25 (2) package type: u-dfn2020-6 sot25 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 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 u-dfn2020-6 dim min max typ a 0.57 0.63 0.60 a1 0 0.05 0.03 a3 ? ? 0.15 b 0.20 0.30 0.25 d 1.95 2.075 2.00 d2 1.45 1.65 1.55 e ? ? 0.65 e 1.95 2.075 2.00 e2 0.76 0.96 0.86 l 0.30 0.40 0.35 all dimensions in mm seating plane d2 d e pin#1 id l b d2/2 e2 e a1 a a3 a m j l d b c h k n
ap7335a 300ma, low quiescent cu rrent, fast transient low dropout linear regulator ap7335a document number: ds35267 rev. 3 - 2 11 of 12 www.diodes.com october 2011 ? diodes incorporated new product taping orientation (note 7) for u-dfn2020-6 note: 7. the taping orientation of the other package type c an be found on our website at h ttp://www.diodes.c om/datasheets/ap 02007.pdf.
ap7335a 300ma, low quiescent cu rrent, fast transient low dropout linear regulator ap7335a document number: ds35267 rev. 3 - 2 12 of 12 www.diodes.com october 2011 ? 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 ? 2011, diodes incorporated www.diodes.com

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