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pam3110 document number: dsxxxxx rev. 2 - 2 1 of 13 www.diodes.com september 2013 ? diodes incorporated pam3110 a product line o f diodes incorporated 1.5a low dropout voltage cmos regulator description the pam3110 is a 1.5a cmos ldo regulator that features a low quiescent current and low dropout voltages, as well as over temperature shutdown. the fixed output voltage of the pam3110 is set at the factory and trimmed to 1.5%. the pam3110 is stable with a ceramic output capacitor of 4.7f or higher. this family of regulators can provide either a stand-alone power supply solution or act as a post regulator for switch mode power supplies. they are particularly su itable for applications requiring low input and output voltages. pam3110 is available in sot-223, to-252 and to-263-2l package. features ? dsp, fpga and microprocessor power supplies ? output voltages:1.2v, 1.5v,1.8v, 2.5v 3.3v and 5.0v ? stable with a ceramic output capacitor ? dropout voltage: 400mv@1.5a ? low quiescent current ? over temperature shutdown ? short circuit protection ? low temperature coefficient ? pb-free packages applications ? dsp, fpga and microprocessor power supplies ? sata power supply ? lcd tv/monitors ? wireless devices ? communication devices ? portable electronics ? post regulator for sms pin assignments
pam3110 document number: dsxxxxx rev. 2 - 2 2 of 13 www.diodes.com september 2013 ? diodes incorporated pam3110 a product line o f diodes incorporated typical applications circuit pin configuration and description pin name pin number function sop-8(ep) w-dfn3x3-10 vin 3 7, 8, 9 supply input voltage. en 2 6 chip enable (active-high). ctrl 4 10 supply voltage of controlcircuitry. pok 1 5 power good open drain output. adj 7 4 set the output voltage by the feedback resistors. v o = 0.8v x (r1 + r2)/r2. vout 6 1, 2, 3 output voltage. nc 5 ? no internal connection. gnd 8, exposed pad (9) exposed pad (11) ground. the exposed pad must be soldered to a large pcb and connected to gnd formaximum powe r dissipation. functional block diagram
pam3110 document number: dsxxxxx rev. 2 - 2 3 of 13 www.diodes.com september 2013 ? diodes incorporated pam3110 a product line o f diodes incorporated absolute maximum ratings (@t a = +25c, unless otherwise specified.) these are stress ratings only and functional operation is not implied. exposure to absolute maximum ratings for prolonged time periods may affect device reliability. all voltages are with respect to ground. parameter rating unit input voltage 6 v storage temperature -65 to +150 c maximum junction temperature 150 c lead soldering temperature 300, (5sec) c recommended operating conditions (@t a = +25c, unless otherwise specified.) parameter rating unit supply voltage 2.5 to 5.5 v ambient temperature range -40 to +85 c junction temperature range -40 to +125 thermal information parameter symbol package max unit thermal resistance junction to case) jc sot-223 7 c/w to-252 7 to-263 7 thermal resistance (junction to ambient) ja sot-223 160 to-252 90 to-263 60 internal power dissipation (@t a = 25c) p d sot-223 625 mw to-252 1200 to-263 2000
pam3110 document number: dsxxxxx rev. 2 - 2 4 of 13 www.diodes.com september 2013 ? diodes incorporated pam3110 a product line o f diodes incorporated electrical characteristics (@t a = +25c, v in = v o +0.5v, v ctrl = v en = 5v, c in = c o = 10f, unless otherwise specified.) parameter symbol test conditions min typ max units input voltage range v in 2.5 5.5 v output voltage accuracy v o i o = 1ma to 1.5a -1.5 1.5 % dropout voltage v drop i o = 500ma v o 2.5v 200 mv i o = 1.5a v o 2.5v 400 short circuit current i sc v o < 0.3v 500 ma quiescent current i q i o = 0ma 75 150 a current limit i lim 2 a line regulation lnr v o 2.5v, i o = 10ma v in = v o +1.5v to v o +2.5v 0.5 1 %/v v o > 2.5v, i o = 10ma v in = v o +0.5v to v o +1.5v load regulation ldr i o = 1ma to 1.5a 0.5 1 % over temperature shutdown ots 160 c over temperature hysteresis oth 30 c temperature coefficient t c 40 ppm/c power supply ripple rejection psrr i o = 100ma f = 100hz 55 db f = 1khz 50 f = 10khz 35
pam3110 document number: dsxxxxx rev. 2 - 2 5 of 13 www.diodes.com september 2013 ? diodes incorporated pam3110 a product line o f diodes incorporated typical performance characteristics (@t a = +25c, c in =4.7f, c out = 4.7f, unless otherwise specified.)
pam3110 document number: dsxxxxx rev. 2 - 2 6 of 13 www.diodes.com september 2013 ? diodes incorporated pam3110 a product line o f diodes incorporated typical performance characteristics (cont.) (@t a = +25c, c in =4.7f, c out = 4.7f, unless otherwise specified.)
pam3110 document number: dsxxxxx rev. 2 - 2 7 of 13 www.diodes.com september 2013 ? diodes incorporated pam3110 a product line o f diodes incorporated application information the pam3110 family of low-dropout (ldo) regulators have several features that allow them to apply to a wide range of applicatio ns. the family operates with very low input voltage and low dropout voltage (t ypically 300mv at full load), making it an efficient stand-alone power supply or post regulator for battery or switch mode power supplies. the 1.5a output current make the pam3110 family suitable for powering many microprocessors and fpga supplies. external capacitor requirements a 4.7 f or larger ceramic input bypass capacitor, connected between v in and gnd and located close to the pam3110, is required for stability. a 4.7f minimum value capacitor from v o to gnd is also required. to improve transient response, noise rejection, and ripple rejection, an additional 1 0 f or larger, low esr capacitor is recommended at the output. a higher-value, low esr output capacitor may be necessary if large, fast-rise-time load transients are anticipated and the device is located severa l inches from the power source, especiall y if the minimum input voltage of 2.5v is used. regulator protection the pam3110 features internal current limiting, thermal protec tion and short circuit protection. during normal operation, the p am3110 limits output current to about 2a. when current limiting engages, the output voltage scales back linearly until the over current condi tion ends. while current limiting is designed to prevent gross device failure, ca re should be taken not to exc eed the power dissipation ratings of the package. if the temperature of the device exceeds +150c, thermal-protection circuitry will shut do wn. once the device has cooled down to a pproximately +30c below the high temp trip point, regulator operation resume s. the short circuit current of the pam3110 is about 0.5a when its output pin is shorted to ground. thermal information the amount of heat that an ldo linear regulator generates is: ?? i v v p o o in d ? ? all integrated circuits have a maximu m allowable junction temperature (t j(max ) above which normal operation is not assured. a system designer must design the operating environment so that the operating junction temperature (t j(max ) does not exceed the maximum junction temperature (t j(max ). the two main environmental variables that a designer can use to improve thermal perfo rmance are air flow and external heat s inks. the purpose of thi s information is to aid the designer in deter mining the proper operating environment for a linear regulator that is operating at a specific power level. in general, the maximum expected power (p d(max) ) consumed by a linear regulator is computed as: where: ? v i(avg) is the average input voltage. ? v o(avg) is the average output voltage. ? i o(avg) is the average output current. ? i (q) is the quiescent current. for most ldo regulators, the quiescent current is insignificant compared to the average output current; therefore, the term v i(avg) xi i (q) can be neglected. the operating junction temperature is computed by adding the ambient temperature (t a ) and the increase in temperature due to the regulator's power dissipation. the temperature rise is computed by multiplying the maximum expected power dissipation by the su m of the thermal resistances between the junction and the case r jc ), the case to heatsink (r cs ), and the heatsink to ambient (r sa ). thermal resistances are measures of how effectivel y an object dissipates heat. typically, the larger the device, the more surface area available for power dissipation so that the object?s thermal resistance will be lowers.
pam3110 document number: dsxxxxx rev. 2 - 2 8 of 13 www.diodes.com september 2013 ? diodes incorporated pam3110 a product line o f diodes incorporated ordering information part number output voltage marking package type standard package pam3110aba120r 1.2v p3110b axxyw sot-223 2500 units/tape&reel pam3110bba120r 1.2v p3110b bxxyw sot-223 2500 units/tape&reel pam3110ala120r 1.2v p3110b bxxyw to-252 2500 units/tape&reel pam3110bla120r 1.2v p3110b bxxyw to-252 2500 units/tape&reel pam3110amb120r 1.2v p3110b bxxyw to-263-2l 800 units/tape&reel pam3110bmb120r 1.2v p3110b bxxyw to-263-2l 800 units/tape&reel pam3110aba150r 1.5v p3110c axxyw sot-223 2500 units/tape&reel pam3110bba150r 1.5v p3110c bxxyw sot-223 2500 units/tape&reel pam3110ala150r 1.5v p3110c axxyw to-252 2500 units/tape&reel pam3110bla150r 1.5v p3110c bxxyw to-252 2500 units/tape&reel pam3110amb150r 1.5v p3110c axxyw to-263-2l 800 units/tape&reel pam3110bmb150r 1.5v p3110c bxxyw to-263-2l 800 units/tape&reel pam3110aba180r 1.8v p3110e axxyw sot-223 2500 units/tape&reel pam3110bba180r 1.8v p3110e bxxyw sot-223 2500 units/tape&reel pam3110ala180r 1.8v p3110e axxyw to-252 2500 units/tape&reel pam3110bla180r 1.8v p3110e bxxyw to-252 2500 units/tape&reel pam3110amb180r 1.8v p3110e axxyw to-263-2l 800 units/tape&reel pam3110bmb180r 1.8v p3110e bxxyw to-263-2l 800 units/tape&reel
pam3110 document number: dsxxxxx rev. 2 - 2 9 of 13 www.diodes.com september 2013 ? diodes incorporated pam3110 a product line o f diodes incorporated ordering information (cont.) part number output voltage marking package type standard package pam3110aba250r 2.5v p3110g axxyw sot-223 2500 units/tape&reel pam3110bba250r 2.5v p3110g bxxyw sot-223 2500 units/tape&reel pam3110ala250r 2.5v p3110g axxyw to-252 2500 units/tape&reel pam3110bla250r 2.5v p3110g bxxyw to-252 2500 units/tape&reel pam3110amb250r 2.5v p3110g axxyw to-263-2l 800 units/tape&reel PAM3110BMB250R 2.5v p3110g bxxyw to-263-2l 800 units/tape&reel pam3110abr330r 3.3v p3110k axxyw sot-223 2500 units/tape&reel pam3110bba330r 3.3v p3110k bxxyw sot-223 2500 units/tape&reel pam3110ala330r 3.3v p3110k axxyw to-252 2500 units/tape&reel pam3110bla330r 3.3v p3110k bxxyw to-252 2500 units/tape&reel pam3110amb330r 3.3v p3110k axxyw to-263-2l 800 units/tape&reel pam3110bmb330r 3.3v p3110k bxxyw to-263-2l 800 units/tape&reel pam3110aba500r 5.0v p3110l axxyw sot-223 2500 units/tape&reel pam3110bba500r 5.0v p3110l bxxyw sot-223 2500 units/tape&reel pam3110ala500r 5.0v p3110l axxyw to-252 2500 units/tape&reel pam3110bla500r 5.0v p3110l bxxyw to-252 2500 units/tape&reel pam3110amb500r 5.0v p3110l axxyw to-263-2l 800 units/tape&reel pam3110bmb500r 5.0v p3110l bxxyw to-263-2l 800 units/tape&reel
pam3110 document number: dsxxxxx rev. 2 - 2 10 of 13 www.diodes.com september 2013 ? diodes incorporated pam3110 a product line o f diodes incorporated marking information
pam3110 document number: dsxxxxx rev. 2 - 2 11 of 13 www.diodes.com september 2013 ? diodes incorporated pam3110 a product line o f diodes incorporated package outline dimensions (all dimensions in mm.) sot-223
pam3110 document number: dsxxxxx rev. 2 - 2 12 of 13 www.diodes.com september 2013 ? diodes incorporated pam3110 a product line o f diodes incorporated package outline dimensions (cont.) (all dimensions in mm.) to-252
pam3110 document number: dsxxxxx rev. 2 - 2 13 of 13 www.diodes.com september 2013 ? diodes incorporated pam3110 a product line o f diodes incorporated 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 rese rve the right to make modifications, enhanc ements, improvements, corrections or ot her changes without further notice to this document and any product descri bed herein. diodes incorporated does not assume any liability ari sing out of the application or use of this document or an y product described herein; neither does di odes incorporated convey any license under its patent or trademark rights, nor the rights of others. any customer or us er of this document or products described herein in such applica tions 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 w hatsoever in respect of any products purchased through unauthoriz ed sales channel. should customers purchase or use diodes inco rporated products for any unintended or una uthorized application, customers shall i ndemnify and hold diodes incorporated and its representativ es harmless against all claims, damages, expenses, and attorney fees arising out of, directly or indirectly, any claim of personal injury or death a ssociated with such unintended or unauthorized application. 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 component s in life support devices or systems without the express written approval of the chief executive offi cer of diodes incorporated. as used herein: a. life support devices or syst ems 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 proper ly 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 devic e or system whose failure to perform can be reasonably expect ed 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 ramifi cations of their life support dev ices or systems, and acknowledge and agree that they are solely responsible for all legal, regulatory and safety-rel ated requirements concerning the ir products and any use of diodes incorporated products in such safety-critical, life support devices or systems, notwithstanding any devices- or s ystems-related information or support that may be provided by diodes incorporated. further, customers must fully indemnify diodes incorporate d and its representatives against any damages arisi ng out of the use of diodes incorporated pr oducts in such safety-critical, life suppor t devices or systems. copyright ? 2012, diodes incorporated www.diodes.com

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