pam3116 document number: dsxxxxx rev. 1 - 0 1 of 10 www.diodes.com october 2012 ? diodes incorporated pam3116 a product line o f diodes incorporated 1.5a low dropout voltage cmos regulator description the pam3116 is a 1.5a cmos ldo regulator that features a low quiescent current and low dropout voltages, as well as over temperature shutdown. the pam3116 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. pam3116 is available in sop-8 package. features ? high output current up to 1.5a ? output voltage available in adj(0.8v) ? stable with a ceramic output capacitor ? dropout voltage: 300mv@1.5a, vo = 3.3v ? low quiescent current ? over temperature shutdown ? short circuit protection ? low temperature coefficient ? standard sop-8 packages ? pb-free package pin assignments applications ? lcd tv/monitors ? set-top box ? iphone charger ? communication devices typical applications circuit v out = 0.8 x (1+r1/r2)
pam3116 document number: dsxxxxx rev. 1 - 0 2 of 10 www.diodes.com october 2012 ? diodes incorporated pam3116 a product line o f diodes incorporated pin description pin name pin number function sop-8 vin 2 supply input voltage. en 3 chip enable adj 6 set the output voltage by the feedback resistors. vout 7 output voltage. nc 1, 5, 8 no internal connection. gnd 4 ground functional block diagram 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 6.5 v output pin voltage -0.3 to v in +0.3 v en, adj, output sense pin voltage -0.3 to v in +0.3 v maximum output current p d /(v in ?v o ) ? storage temperature -65 to +150 c maximum junction temperature 150 c lead soldering temperature 300, (5sec) c
pam3116 document number: dsxxxxx rev. 1 - 0 3 of 10 www.diodes.com october 2012 ? diodes incorporated pam3116 a product line o f diodes incorporated recommended operating conditions (@t a = +25c, unless otherwise specified.) parameter rating unit maximum supply voltage 6 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 sop-8 11 c/w thermal resistance (junction to ambient) ja sop-8 90 internal power dissipation p d sop-8 1100 mw electrical characteristics (@t a = +25c, v in = v o +1v, c in = 4.7f, c o = 4.7f, unless otherwise specified.) parameter symbol test conditions min typ max units input voltage range v in 2.5 6.0 v output voltage range v o 0.8 5 v adj reference voltage v ref i o = 1ma 0.788 0.8 0.812 v output voltage accuracy v o i o = 1ma -1.5 1.5 % output current i o v o > 0.8v 1500 ma output current limit i lim v o > 0.8v 1500 2500 ma short circuit current i sc i o = 0ma 700 ma dropout voltage v drop i o = 1.5a 0.8v v o < 2.5v 1700 mv v o 2.5v 300 400 quiescent current i q i o = 0ma 90 150 a line regulation lnr i o = 1ma, v in = v o +1 to v o +2 -0.4 0.4 %/v load regulation ldr i o = 1ma to 1500ma -1.0 0.2 +1.0 % temperature coefficient t c 40 ppm/c over temperature shutdown ots i o = 1ma 150 c over temperature hysteresis oth i o = 1ma 40 c power supply ripple rejection psrr i o = 100ma, v o = 1.2ma f = 100hz 70 db f = 1khz 65 f = 10khz 50 output noise vn f = 10hz to 100khz, i o = 10ma 50 v rms en input high threshold v eh v in = 2.5v to 5v 1.5 v en input low threshold v el v in = 2.5v to 5v 0.3 v en input high bias current i eh v en = 5v, v in = 5v 0.5 a en input low bias current i el v en = 0v, v in = 5v 0.5 a shutdown current i sd v en = 0v 1 a
pam3116 document number: dsxxxxx rev. 1 - 0 4 of 10 www.diodes.com october 2012 ? diodes incorporated pam3116 a product line o f diodes incorporated typical performance characteristics (@t a = +25c, c in =2.2f, c o = 4.7f, unless otherwise specified.)
pam3116 document number: dsxxxxx rev. 1 - 0 5 of 10 www.diodes.com october 2012 ? diodes incorporated pam3116 a product line o f diodes incorporated typical performance characteristics (cont.) (@t a = +25c, c in =4.7f, c o = 4.7f, unless otherwise specified.)
pam3116 document number: dsxxxxx rev. 1 - 0 6 of 10 www.diodes.com october 2012 ? diodes incorporated pam3116 a product line o f diodes incorporated typical performance characteristics (cont.) (@t a = +25c, c in =4.7f, c o = 4.7f, unless otherwise specified.)
pam3116 document number: dsxxxxx rev. 1 - 0 7 of 10 www.diodes.com october 2012 ? diodes incorporated pam3116 a product line o f diodes incorporated application information the pam3116 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 (typ ically 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 pam3116 family suitable for powering many microprocessors and fpga suppl ies. the pam3116 fa mily also has low output noise (typically 50 vrms with 4.7 f output capacitor), making it ideal for use in telecom equipment. external capacitor requirements a 4.7 f or larger ceramic input bypass capacitor, connected between v in and gnd and located close to the pam3116, 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 high er-value, low esr output capacitor may be necessary if large , fast-rise-time load transients are anticipated and the device is located several inches fr om the power source, especially if th e minimum input voltage of 2.5v is used. regulator protection the pam3116 features internal current limiti ng, thermal protection and short circuit pr otection. during normal operation, the p am3116 limits output current to about 2.5a. when current limiting engages, the ou tput voltage scales back linearly until the over current con dition ends. while current limiting is designed to prevent gross device failure, care should be taken not to exc eed the power dissipation ratings of the package. if the temperature of the device exceeds +150c, th ermal-protection circuitry will shut down. once the device has cooled down to appro ximately +40c below the high temp trip point, regulator operation resumes. t he short circuit current of the pam3116 is about 0.7a when its ou tput 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 ) does not exceed the maximum junction temperature (t j(max) ). the two main environmental variables that a designer can use to improve thermal per formance are air flow and external heat s inks. the purpose of thi s information is to aid the designer in det ermining 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 cu rrent is insignificant compared to the av erage output current; therefore, the term v i(avg) xi 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 effectiv ely 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.
pam3116 document number: dsxxxxx rev. 1 - 0 8 of 10 www.diodes.com october 2012 ? diodes incorporated pam3116 a product line o f diodes incorporated application information (cont.) setting the output voltage the internal reference is 0.8v (typical). the output voltage is calculated as below: ? ? ? ? ? ? + = 2 r 1 r 1 x 8 . 0 v o the output voltage is given by table 1. table 1: resistor selection for output voltage setting. v o r1 r2 1.2v 56k 110k 1.5v 130k 150k 1.8v 150k 120k 2.5v 215k 100k 3.3v 374k 120k 5.0v 620k 120k ordering information part number output voltage marking package type standard package PAM3116BLBADJR adjustable p3116 xxxyw sop-8 2500 units/tape&reel
pam3116 document number: dsxxxxx rev. 1 - 0 9 of 10 www.diodes.com october 2012 ? diodes incorporated pam3116 a product line o f diodes incorporated marking information package outline dimensions (all dimensions in mm.)
pam3116 document number: dsxxxxx rev. 1 - 0 10 of 10 www.diodes.com october 2012 ? diodes incorporated pam3116 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 reserve the right to ma ke modifications, enhancements, im provements, corrections or ot her changes without further notice to this document and any product described herein. diodes incorporated does not assume any liability ari sing 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 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 incorporat ed 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 wh atsoever in respect of any products purchased through unauthoriz ed sales channel. should customers purchase or use diodes inco rporated products for any unintended or unauthorized application, customers shall i ndemnify and hold diodes incorporated and its representat ives 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. this document is written in english but may be translated into mu ltiple languages for reference. only the english version of t his document is the final and determinative format released by diodes incorporated. life support diodes incorporated products are specifically not authorized for use as critical comp onents 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 inst ructions 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 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 the ir products and any use of diodes incorporated products in such safety-critica l, 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 incorporate d and its representatives against any damages arising out of the use of diodes incorporated products in such safety-critical, life suppor t devices or systems. copyright ? 2012, diodes incorporated www.diodes.com
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