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rev. 1.1 august 2012 www.aosmd.com page 1 of 12 AOZ2003 3a ultra low dropout linear regulator general description the AOZ2003 is a 3a ultra low dropout linear regulator designed for desktop motherboard, graphic card and notebook applications. this device needs dual supplies, a control voltage for the control circuitry and an input voltage for power conversion. the AOZ2003 delivers high-current and ultra low-drop output voltage for applications where v out is very close to v in . the AOZ2003 features comprehensive control and protection functions: a power on reset (por) circuit for monitoring both control and power inputs for proper operation; an en input for enabling or disabling the device, a power ok with time delay for indicating the output voltage status, a current limit function, and a thermal shutdown function. the AOZ2003 is available in exposed pad so-8 package. features ? ultra low dropout linear regulator ? 1.35v~5.5v vin supply voltage with external control voltage ? dropout voltage (typical): ??? 180mv @ 2a ??? 270mv @ 3a ? high accuracy output voltage + 1.5% ? enable and power good ? vout pull low resistance when disabled ? current limiting protection ? thermal shutdown protection ? output voltage adjustable ? small footprint exposed pad so-8 package ? green product and rohs compliant applications ? desktop, notebook pcs ? workstations ? graphic cards ? low voltage logic supplies ? gaming ? smps post regulators typical application en pok vout vin gnd fb AOZ2003 c1 optional c2 1f co 22f pok en cntl 1.072v 1.8v 5v r3 5.1k c3 10f r2 12k r1 4k v in v out v cntl 3 6 7 1 2 4 8
AOZ2003 rev. 1.1 august 2012 www.aosmd.com page 2 of 12 ordering information aos green products use reduced levels of halogens, and are also rohs compliant. please visit www.aosmd.com/media/aosgreenpolicy.pdf for additional information. pin configuration pin description part number ambient temperature range package environmental AOZ2003pi -40 c to +85 c epad so-8 green product pin number pin name pin function 1 pok power ok indication. this pin is an open -drain output and is set high impedance once vout reaches 90% of its rating voltage. 2 en enable input. pulling this pin below 0.8v turns the regulator off, reducing the quiescent current to a fraction of its operating value. 3 vin input voltage. this is the drain input to the power device that supply current to the output pin. large bulk capacitors with low esr shou ld be placed physically close to this pin o prevent the input rail from dropping during large load transient. a 10 f ceramic capacitor is recommended at this pin. 4 vcntl supply input for control circuit. this pin pr ovides bias voltage to the control circuitry and driver for the pass transistor. the driving capability of output current is proportioned to the vcntl. for the device to regulate, the voltage on this pin must be at least 3v greater than the output voltage, and no less than vcntl_min. 5 nc not internally connected. 6 vout output voltage. this pin is power output of the device. a pul l low resistance exists when the device is disabled by pulling low the en pin. 7 fb feedback voltage. this pin is the inverting inp ut to the error amplifier. a resistor divider from the output to gnd is used to set the r egulation voltage as vout=0.8x(r1+r2)/r2 (v) 8 gnd ground. exposed pad gnd ground. the exposed pad acts t he dominant power dissipation path and should be soldered to well design pcb pads. pok 1 gnd 8 en 2 fb 7 vin 3 vout 6 vcntl 4 nc 5 exposed pad gnd epad so-8 (top view)
AOZ2003 rev. 1.1 august 2012 www.aosmd.com page 3 of 12 block diagram softstart & control logic fb 0.8v vref vout pok en vcntl vin otp por gnd 90% vref 0.1v delay ocp
AOZ2003 rev. 1.1 august 2012 www.aosmd.com page 4 of 12 absolute maximum ratings exceeding the absolute maxi mum ratings may damage the device. note: 1. devices are inherently esd s ensitive, handling precautions are required. human body model rating: 1.5k ? in series with 100pf. recommended operating conditions the device is not guaranteed to operate beyond the recommended operating conditi ons.electrical characteristics electrical characteristics t a = 25 c, v in = 1.7v, v cntl = v en = 5v, c in = c out = 10 ? f, unless otherwise specif ied. specifications in bold indicate a temperature of -40c to +85c. parameter rating vin 1v to 6v vcntl 3v to 6v vout 0.8v to 6v other pins -0.3v to 6v esd rating (1) 2kv parameter rating supply voltage (v in ) 1.35v to 5v supply control voltage (v cntl ) 3v to 5v junction temperature (t j ) -40c to +125c ambient temperature (t a ) -40c to +85c power dissipation (p d )2w package thermal resistance epad so-8 ( ? ja )50c/w symbol parameter conditions min. typ. max. units input stage v in input voltage range i out = 100ma 1.35 5.5 v v cntl input control voltage 3 5.5 v v por por 2.4 2.7 3 v v uvlo_hys under-voltage lockout hysteresis 300 mv i cntl input supply current en = in, v out = v fb , no load 0.5 1 ma en = agnd 20 ? a v fb feedback reference voltage t a = 25 oc, no load 0.788 0.800 0.812 v i fb feedback bias current 0.02 ? a regulation ? v fb line regulation (v in )v in = 1.4v to 5v, i out = 100ma, v out = 1.2 v 0.015 0.15 % / ? v line regulation (v cntl )v cntl = 3v to 5v, i out = 100ma, v out = 1.2v 0.015 0.15 % / ? v load regulation v in = 1.8v, i out = 100ma to 3a, v out = 1.2v 0.45 1.5 % v drop (1) drop voltage i out = 300ma, v en = v cntl = 5v, v out = 1.2v 50 75 mv i out = 2a, v en = v cntl = 5v, v out = 1.2v 180 250 mv i out = 3a, v en = v cntl = 5v, v out = 1.2v 270 350 mv r pull-down v out pull-down 90 ?
AOZ2003 rev. 1.1 august 2012 www.aosmd.com page 5 of 12 note: 1. the dropout voltage is defined as v in - v out , which is measured when v out is v out - 100mv. 2. the current limit was measured by the co nstant current limit value when vout is shorted directly. it is noted that the outpu t capacitor current was not included. enable / pok v en_hi enable high level 1.2 v v en_low disable low level 0.2 v i en enable bias current v en = 5.5v 12 ? a v pok_th pok threshold v in = v en =v cntl = 5v, no load, v out = 1.2 v 90 % v pok_hys pok hysteresis v in = v en =v cntl = 5v, no load, v out = 1.2 v 10 % t pok_on pok time delay (on) v in = v en =v cntl = 5v, no load, v fb > 90%*v ref 2ms t pok_off pok time delay (off) v in = v en =v cntl = 5v, no load, v fb < 10%*v ref 50 ? s v pok_low pok pull-low voltage pok sink current = 5ma 0.45 v protection i lim (2) current limit 3.2 4 a i sc short circuit current v out < 0.1v 1.4 a t sd thermal shutdown threshold 160 oc ? t sd thermal shutdown hysteresis 30 oc thermal shutdown temperature reset v out < 0.1v 100 oc symbol parameter conditions min. typ. max. units electrical characteristics (continued) t a = 25 c, v in = 1.7v, v cntl = v en = 5v, c in = c out = 10 ? f, unless otherwise specif ied. specifications in bold indicate a temperature of -40c to +85c.
AOZ2003 rev. 1.1 august 2012 www.aosmd.com page 6 of 12 5ms /div 5ms /div v in line transient response (0a) v in line transient response (3a) load transient response 2ms/ div 2ms /div i o (1a/div) v o(ac) (10mv/div) i o (1a/div) v o(ac) (10mv/div) v o (50mv/div) v in (1v/div) v o (50mv/div) v in (1v/div) i o (2a/div) v en (1v/div) v o (1v/div) v pok (2v/div) load transient response 1ms /div 500s /div start-up from enable start-up from v in v o v pok 800s i o (2a/div) v en (1v/div) v o (1v/div) v pok (2v/div) v o v pok 1.5ms functional characteristics
AOZ2003 rev. 1.1 august 2012 www.aosmd.com page 7 of 12 400s /div 20ms /div over temperature protection (v in = 3.3v) current limit short current protection 10s/ div 500s /div i o (2a/div) v in (1v/div) v o (500mv/div) i o (2a/div) v in (1v/div) v o (1v/div) i o (1a/div) v o (200mv/div) start-up from v cntl i o (2a/div) v cntl (5v/div) v o (1v/div) v pok (1v/div) 1ms functional characteristics (continued)
AOZ2003 rev. 1.1 august 2012 www.aosmd.com page 8 of 12 temperature (c) load (a) voltage drop (mv) short circuit current (a) v cntl standby current (a) reference voltage (v) 0 0.5 1.0 1.5 2.0 2.5 3.0 85c 25c -40c 300 250 200 150 100 50 0 -40 -20 0 20 40 60 80 2.0 1.9 1.7 1.8 1.5 1.6 1.4 1.2 1.3 1.0 1.1 temperature (c) -40 -20 0 20 40 60 80 10 9 7 8 5 6 4 2 3 0 1 temperature (c) -40 -20 0 20 40 60 80 0.830 0.825 0.815 0.820 0.805 0.810 0.800 0.790 0.795 0.780 0.785 v cntl por voltage (v) temperature (c) -40 -20 0 20 40 60 80 2.90 2.85 3.00 2.95 2.75 2.80 2.65 2.70 2.60 2.50 2.55 2.40 2.45 dropout voltage vs. load current short circuit vs. temperature v cntl standby current vs. temperature v cntl por threshold voltage vs. temperature reference voltage vs. temperature typical performance characteristics circuit of typical application. t a = 25c, v in = 1.8v, v cntl = 5v, v out = 1.2v, unless otherwise specified.
AOZ2003 rev. 1.1 august 2012 www.aosmd.com page 9 of 12 application information output voltage setting the output voltage can be set by the output voltage divider. typically, the adjustable range of the output voltage is from 1v to (v in - v drop ). the output voltage is set by (1). supply voltage (vcntl) supply voltage is used to provide the power for the internal circuits. for the device to regulate, the voltage on this pin must be at least 3v greater than the output voltage, and no less than v cntl_min . a 0.1 f or more ceramic capacitor close to the pin is required to filter the control voltage. enable (en) the en pin is used to turn o ff the regulator by pulling this pin below 0.8v. when the linear regulator is operated in the disable mode, the quiescent current can be limited below several ten micro-amp level. input / output capacitor a 10 f or more capacitances for the input side (vin) is necessary. this not only decouples the noise from input side, but also keeps the input impedance as low as possible. in addition, a 22 f or more capacitances for the vin above 4.5v is recommended for much lower input impedance. a 10 f output capacitor is typically used with a 0.1 f ceramic capacitor for the output terminal (vout). internal type-ii compensation network allows lower esr capacitors without stability problem. power ok (pok) the pok pin is used to provide a logic signal to notice that the regulator works well. when the output voltage through the voltage divider is regulated above 90% of reference voltage, this pin will be as a high impedance status due to the open-drain output. an external pull-up resister is necessary to provide high-level signal. the sink capability of the pok pin is limited below 5ma. typically, a 5.1k ? resister for the 5v is recommended. over temperature protection (otp) it is recommended that the junction temperature can be kept below the recommended operation condition 125 degree for maximum reliability. this power dissipation is conducted through the package into the ambient environment, and, in the process, the temperature of the die (t j ) rises above ambient. v out 0.8 v r 1 r 2 + r 2 --------------------- - ? =
AOZ2003 rev. 1.1 august 2012 www.aosmd.com page 10 of 12 package dimensions, so-8 ep1 notes: 1. package body sizes exclude mold flash and gate burrs. 2. dimension l is measured in gauge plane. 3. tolerance 0.10mm unless otherwise specified. 4. controlling dimension is millimeter, converted inch dimensions are not necessarily exact. 5. die pad exposure size is according to lead frame design. 6. followed from jedec ms-012 symbols a a1 a2 b c d d0 d1 e e e1 e2 e3 l y | l1Cl1' | l1 dimensions in millimeters recommended land pattern min. 1.40 0.00 1.40 0.31 0.17 4.80 3.20 3.10 5.80 3.80 2.21 0.40 0 d0 unit: mm nom. 1.55 0.05 1.50 0.406 4.96 3.40 3.30 6.00 1.27 3.90 2.41 0.40 ref 0.95 3 0.04 1.04 ref max. 1.70 0.10 1.60 0.51 0.25 5.00 3.60 3.50 6.20 4.00 2.61 1.27 0.10 8 0.12 dimensions in inches d1 e1 e e3 e2 note 5 l1' l1 l gauge plane 0.2500 c d 7 (4x) b 3.70 2.20 2.87 2.71 5.74 1.27 0.80 0.635 e a1 a2 a symbols a a1 a2 b c d d0 d1 e e e1 e2 e3 l y | l1Cl1' | l1 min. 0.055 0.000 0.055 0.012 0.007 0.189 0.126 0.122 0.228 0.150 0.087 0.016 0 nom. 0.061 0.002 0.059 0.016 0.195 0.134 0.130 0.236 0.050 0.153 0.095 0.016 ref 0.037 3 0.002 0.041 ref max. 0.067 0.004 0.063 0.020 0.010 0.197 0.142 0.138 0.244 0.157 0.103 0.050 0.004 8 0.005
AOZ2003 rev. 1.1 august 2012 www.aosmd.com page 11 of 12 tape and reel dimensions, so-8 ep1 carrier tape reel tape size 12mm reel size ?330 m ?330.00 0.50 package so-8 (12mm) a0 6.40 0.10 b0 5.20 0.10 k0 2.10 0.10 d0 1.60 0.10 d1 1.50 0.10 e 12.00 0.10 e1 1.75 0.10 e2 5.50 0.10 p0 8.00 0.10 p1 4.00 0.10 p2 2.00 0.10 t 0.25 0.10 n ?97.00 0.10 k0 unit: mm b0 g m w1 s k h n w v r trailer tape 300mm min. or 75 empty pockets components tape orientation in pocket leader tape 500mm min. or 125 empty pockets a0 p1 p2 feeding direction p0 e2 e1 e d0 t d1 w 13.00 0.30 w1 17.40 1.00 h ?13.00 +0.50/-0.20 k 10.60 s 2.00 0.50 g r v leader/trailer and orientation unit: mm
AOZ2003 rev. 1.1 august 2012 www.aosmd.com page 12 of 12 part marking z2003pi fay part number code assembly lot code year & week code wlt fab & assembly location AOZ2003pi (so-8 ep1) 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. legal disclaimer alpha and omega semiconductor makes no representations or warranties with respect to the accuracy or completeness of the information provided herein and take s no liabilities for the cons equences of use of such information or any product described herein. alpha and omega semiconductor reserves the right to make changes to such information at any time without further notice. this do cument does not constitute the grant of any intellectual property rights or representation of non-infringement of any third party?s intellectual property rights. life support policy alpha and omega semiconductor products are not authorized for use as critical components in life support devices or systems.

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