fn9235 rev 1.00 page 1 of 10 march 11, 2008 fn9235 rev 1.00 march 11, 2008 isl9008 low noise ldo with low i q and high psrr datasheet isl9008 is a high performance single low noise, high psrr ldo that delivers a continuous 150ma of load current. it has a low standby current and is stable with 1f of mlcc output capacitance with an esr of up to 200m ? . the isl9008 has a high psrr of 65db and output noise less than 45v rms . when coupled with a no load quiescent current of 45a (typical), an d 0.5a shutdown current, the isl9008 is an ideal choice for portable wireless equipment. the isl9008 comes in severa l fixed voltage options with 1.8% output voltage accuracy over temperature, line and load. other output voltage op tions are available on request. pinout isl9008 (5 ld sc-70) top view features ? high performance ldo wi th 150ma continuous output ? excellent transient respons e to large current steps ? excellent load regulation: < 0.1% voltage change acro ss full range of load current ? high psrr: 65db @ 1khz ? wide input voltage cap ability: 2.3v to 6.5v ? very low quiescent current: 45a ? low dropout voltage: typically 200mv @ 150ma ? low output noise: typically 45vrms @ 100a (1.5v) ? stable with 1f to 4.7f ceramic capacitors ? shutdown pin turns off ldo with 1a (max) standby current ? soft-start limits input c urrent surge during enable ? current limit and overheat protection ? 1.8% accuracy over all operating conditions ? 5 ld sc-70 package ? -40c to +85c operating temperature range ? pb-free (rohs compliant) applications ? pdas, cell phones and smart phones ? portable instruments, mp3 players ? handheld devices including medical handhelds vin gnd en vo nc 1 2 3 5 4 n o t r e c o m m e n d e d f o r n ew d e s i g n s r e c o m m e n d e d r e p l a c e m e n t p a r t i s l 9 0 0 8 a
isl9008 fn9235 rev 1.00 page 2 of 10 march 11, 2008 ordering information part number (notes 1, 2) part marking vo voltage (note 3) temp. range (c) package (pb-free) tape and reel package drawing isl9008ienz -t cbb 3.3v -40 to +85 5 ld sc-70 tape and reel p5.049 isl9008iemz -t cay 3.0v -40 to +85 5 ld sc-70 tape and reel p5.049 isl9008iekz -t caw 2.85v -40 to +85 5 ld sc-70 tape and reel p5.049 isl9008iejz -t cav 2.8v -40 to +85 5 ld sc-70 tape and reel p5.049 isl9008iehz -t cat 2.75v -40 to +85 5 ld sc-70 tape and reel p5.049 isl9008iefz -t cas 2.5v -40 to +85 5 ld sc-70 tape and reel p5.049 isl9008iecz -t car 1.8v -40 to +85 5 ld sc-70 tape and reel p5.049 isl9008iebz -t cap 1.5v -40 to +85 5 ld sc-70 tape and reel p5.049 notes: 1. please refer to tb347 for de tails on reel specifications 2. for other output voltages, contact intersil marketing. 3. these intersil pb-free plasti c packaged products employ speci al pb-free material sets; molding compounds/die attach material s and 100% matte tin plate plus anneal - e3 termi nation finish, which is rohs co mpliant and compatible with both snpb and pb-free soldering ope rations. intersil pb-free products are msl classified at pb-free peak re flow temperatures that meet or exceed the pb-free requirements of ipc/jedec j std-020.
isl9008 fn9235 rev 1.00 page 3 of 10 march 11, 2008 absolute maximum ratings thermal information supply voltage (vin) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . +7.1v v o pin . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . +3.6v all other pins . . . . . . . . . . . . . . . . . . . . . . . . . -0.3v to (vin + 0.3v) recommended operating conditions ambient temperature range (t a ) . . . . . . . . . . . . . . .-40c to +85c supply voltage (vin) . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2.3 to 6.5v thermal resistance (note 4) ? ja (c/w) 5 ld sc-70 package . . . . . . . . . . . . . . . . . . . . . . . . 565 junction temperature range . . . . . . . . . . . . . . . . .-4 0c to +125c operating temperature range . . . . . . . . . . . . . . . . .-4 0c to +85c storage temperature range . . . . . . . . . . . . . . . . . .-6 5c to +150c pb-free reflow profile . . . . . . . . . . . . . . . . . . . . . . . . .see link below http://www.intersil.com/pbfree/pb-freereflow.asp caution: do not operate at or near the maximum ratings listed fo r extended periods of time. exposure to such conditions may adv ersely impact product reliability and result in failures not covered by warranty. note: 4. ? ja is measured in free air with the component mounted on a high e ffective thermal conductivity t est board with direct attach f eatures. see tech brief tb379. 5. limits established by characte rization and are not production tested. electrical specifications unless otherwise noted, all parameters are guaranteed over the operational supply voltage and temperature range of the device as follows: t a = -40c to +85c; v in = (v o +0.5v) to 6.5v with a minimum v in of 2.3v; c in = 1f; c o = 1f parameter symbol test conditions min (note 7 typ max (note 7) units dc characteristics supply voltage v in 2.3 6.5 v ground current i dd quiescent condition: i o = 0a 45 65 a shutdown current i dds 0.5 1.2 a uvlo threshold v uv+ 1.9 2.1 2.3 v v uv- 1.6 1.8 2.0 v regulation voltage accuracy initial accuracy at v in = v o + 0.5v, i o = 10ma, t j = +25c -0.7 +0.7 % v in = v o + 0.5v to 6.5v, i o = 10a to150ma, t j =+ 25c -0.8 +0.8 % v in = v o + 0.5v to 6.5v, i o = 10a to 150ma, t j = -40c to +125c -1.8 +1.8 % maximum output current i max continuous 150 ma internal current limit i lim 175 265 355 ma drop-out voltage (note 6) v do1 i o = 150ma; v o ? 2.5v 300 500 mv v do2 i o = 150ma; 2.5v ? v o ? 2.8v 250 400 mv v do3 i o = 150ma; 2.8v ? v o 200 325 mv thermal shutdown temperature t sd+ 140 c t sd- 110 c ac characteristics ripple rejection (note 6) i o = 10ma, v in = 2.8v(min), v o = 1.8v @ 1khz 65 db @ 10khz 45 db @ 100khz 35 db output noise voltage (note 6) v o = 1.5v, t a = +25c bw = 10hz to 100khz, i o = 100a 45 v rms bw = 10hz to 100khz, i o = 10ma 65 v rms device start-up characteristics device enable time t en time from assertion of the enx pin to when the output voltage reaches 95% of the vo(nom) 250 500 s
isl9008 fn9235 rev 1.00 page 4 of 10 march 11, 2008 ldo soft-start ramp rate t ssr slope of linear portion of ldo output voltage ramp during start -up 30 60 s/v en pin characteristics input low voltage v il -0.3 0.4 v input high voltage v ih 1.4 v in + 0.3 v input leakage current i il , i ih 0.1 a pin capacitance c pin informative 5 pf notes: 6. vox = 0.98*vox(nom); valid for vox greater than 1.85v 7. parts are 100% tested at +25c. temperature limits establishe d by characterization and are not production tested. electrical specifications unless otherwise noted, all parameters are guaranteed over the operational supply voltage and temperature range of the device as follows: t a = -40c to +85c; v in = (v o +0.5v) to 6.5v with a minimum v in of 2.3v; c in = 1f; c o = 1f (continued) parameter symbol test conditions min (note 7 typ max (note 7) units typical performance curves figure 1. output voltage vs input voltage (3.3v output) figure 2. output voltage change (%) vs input voltage (3.3v output) figure 3. output vo ltage vs load current figure 4. output voltage vs temperature output voltage, vo (%) input voltage (v) -0.6 -0.2 0.2 0.6 -0.8 3.8 4.2 6.2 5.8 6.6 3.4 4.6 5.0 5.4 -0.4 0.0 0.4 0.8 v o = 3.3v +85 ? c -40 ? c +25 ? c i load = 0ma output voltage change (%) input voltage (v) vo = 3.3v i o = 0ma i o = 75ma i o = 150ma +25c 0.2 0.1 0.0 -0.1 -0.2 -0.3 -0.4 3.3 3.8 4.3 4.8 5.3 5.8 6.3 load current - i o (ma) output voltage change (%) +85c -40c +25c 1.0 0.8 0.6 0.4 0.2 0.0 -0.2 -0.4 -0.6 -0.8 -1.0 0 25 50 75 100 125 150 175 v in = 3.8v v o = 3.3v 0.04 0.06 -0.06 -0.10 -25 0 25 85 -40 temperature ( ? c) output voltage (%) -0.02 0.00 0.02 0.08 0.10 -0.04 -0.08 55 v in = 3.8v v o = 3.3v i o = 0ma i o = 75ma i o = 150ma
isl9008 fn9235 rev 1.00 page 5 of 10 march 11, 2008 figure 5. dropout voltage vs input voltage (3.3v output) figure 6. dropout voltage vs input voltage (2.8v output) figure 7. dropout voltage vs load current figure 8. dropout voltage vs load current figure 9. ground current vs input voltage figure 10. ground current vs load typical performance curves (continued) output voltage, vo (v) input voltage (v) 3.4 3.3 3.2 3.1 3.0 2.9 2.8 2.7 2.6 2.5 2.4 2.3 2.6 3.1 3.6 4.1 4.6 5.1 5.6 6.1 6.6 i o = 150ma i o = 0ma i o = 75ma v o = 3.3v +25c input voltage (v) output voltage, vo (v) v o = 2.8v 2.9 2.8 2.7 2.6 2.5 2.4 2.3 2.5 3.0 3.5 4.0 4.5 5.0 5.5 6.0 6.5 i o = 150ma i o = 0ma i o = 75ma +25c output load (ma) v o = 2.8v v o = 3.3v drop out voltage, v do (mv) 250 200 150 100 50 0 0 25 50 75 100 125 150 175 100 125 150 175 75 25 0 25 50 75 100 125 150 175 0 output load (ma) drop out voltage, v do (mv) vo = 3.3v +85 ? c +25 ? c -40 ? c 225 50 200 15 30 45 60 90 0 2.5 3.5 5.0 input voltage (v) ground current (a) 75 1.5 2.0 3.0 4.0 4.5 -40 ? c +85 ? c 6.0 5.5 6.5 i o = 0a v o = 3.3v +25 ? c 100 20 0 25 50 75 100 125 0 load current (ma) ground current (a) 175 150 v o = 3.3v v in = 3.8v 40 60 80 120 140 +85 ? c -40 ? c +25 ? c
isl9008 fn9235 rev 1.00 page 6 of 10 march 11, 2008 figure 11. ground current vs temperature figure 12. turn on/turn off response figure 13. line transient response, 3.3v output figure 14. line transient response, 2.8v output figure 15. load transient response figure 16. psrr vs frequency typical performance curves (continued) 55 35 -20 0 20 60 -40 temperature ( ? c) ground current (a) 75 85 95 65 45 -30 -10 10 40 30 50 70 105 115 80 90 il = 150ma il = 75ma il = 0ma v in = 3.8v v o = 3.3v 1 3 0 2 0 100 200 300 400 500 600 700 800 0 time (s) vo(v) ven (v) 5 v o = 3.3v v in = 5.0v i l = 150ma c l = 1f 900 1000 400s/div v o = 3.3v i load = 150ma 3.6v 4.3v 10mv/div c load = 1f c byp = 0.01f 400s/div v o = 2.8v i load = 150ma 3.5v 4.2v 10mv/div c load = 1f c byp = 0.01f 1.0 ms/div vo (10mv/div) i load 100ma 100a v in = 3.8v v o = 3.3v 0.1k 1k 10k 100k 1m frequency (hz) 10 20 30 40 50 60 80 psrr (db) v in = 3.9v v o = 1.8v c byp = 0.1f c load = 1f 50ma 10ma 70
isl9008 fn9235 rev 1.00 page 7 of 10 march 11, 2008 pin description typical application figure 17. spectral noise density vs frequency typical performance curves (continued) spectral noise density (v/ ? hz ) 2.0 1.0 0.1 0.01 0.001 10 100 1k 10k 100k 1m frequency (hz) v in = 3.9v v o = 1.8v c byp = 0.1f c in = 1f c load = 1f 100a 10ma pin number pin name description 1 vin supply voltage/ldo input: connect a 1f capacitor to gnd. 2 gnd gnd is the connection to system ground. connect to pcb grou nd plane. 3 en output enable. when this si gnal goes high, the ldo is turned on. 4 nc no connect 5 vo ldo output: connect a 1f capacitor of value to gnd c1, c2: 1f x5r ceramic capacitor isl9008 vin gnd vo nc 5 4 1 2 vin (2.3 to 5v) vout c1 c2 en 3 enable off on c3: 0.1f x5r ceramic capacitor
isl9008 fn9235 rev 1.00 page 8 of 10 march 11, 2008 block diagram vo gnd bandgap and temperature sensor uvlo vin sd voltage and reference generator 1.0v 0.94v 0.9v gnd short circuit, thermal protection, soft-start control logic + -
fn9235 rev 1.00 page 9 of 10 march 11, 2008 isl9008 intersil products are manufactured, assembled and tested utilizing iso9001 quality systems as noted in the quality certifications found at www.intersil.com/en/suppor t/qualandreliability.html intersil products are sold by description on ly. intersil may modify the circuit design an d/or specifications of products at any time without notice, provided that such modification does not, in intersil's sole judgment, affect the form, fit or function of the product. accordingly, the reader is cautioned to verify that datasheets are current before placing orders. information fu rnished by intersil is believed to be accu rate and reliable. however, no responsib ility is assumed by intersil or its subsidiaries for its use; nor for any infrin gements of patents or other rights of third parties which may result from its use. no license is granted by implication or otherwise under any patent or patent rights of intersil or its subsidiaries. for information regarding intersil corporation and its products, see www.intersil.com for additional products, see www.intersil.com/en/products.html ? copyright intersil americas ll c 2006-2008. all rights reserved. all trademarks and registered trademarks are the property of their respective owners. functional description the isl9008 contains all circui try required to implement a high performance ldo. high performance is achieved through a circuit that deliver s fast transient response to varying load conditions. in a quiescent condition, the isl9008 adjusts its biasing to achieve the lowest standby current consumption. the device also integr ates current limit protection, smart thermal shutdown protection, and soft-start. smart thermal shutdown protects the device aga inst overheating. soft-start minimizes start-up input cu rrent surges without causing excessive device turn-on time. power control the isl9008 has an enable pin, (en), to control power to the ldo output. when en is low, the device is in shutdown mode. in this condition, all on-ch ip circuits are off, and the device draws minimum current, typically less than 0.3a. when the en pin goes high, the d evice first polls the output of the uvlo detector to ensure that vin voltage is at least 2.1v (typical). once verified, the device initiates a start-up sequence. during the start-up s equence, trim settings are first read and latched. then, s equentially, the bandgap, reference voltage and current generation circuitry turn-on. once the references are stable, the ldo powers-up. during operation, whenever th e vin voltage drops below about 1.84v, the isl9008 imme diately disables the ldo output. when vin rises back above 2.1v (assuming the en pin is high), the device re-init iates its start- up sequence and ldo operation resu mes automatically. reference generation the reference generation ci rcuitry includes a trimmed bandgap, a trimmed voltage reference divider, a trimmed current reference generator , and an rc noise filter. the bandgap generates a zero te mperature coefficient (tc) voltage for the regulator r eference and other voltage references required for current generation and over-temperature detection. a current generator provides references required for adaptive biasing as well as references fo r ldo output current limit and thermal shutdown determination. ldo regulation and programmable output divider the ldo regulator is impl emented with a high-gain operational amplifier driving a pmos pass transistor. the design of the isl90 08 provides a regulat or that has low quiescent current, fast trans ient response, and overall stability across all operating and load current conditions. ldo stability is guaranteed for a 1f to 4.7f output capacitor that has a tolerance better than 20% and esr less than 200m ? . the design is performance-optimized for a 1f capacitor. unless limited by the application, use of an output capacitor value above 4.7f is not recommended as ldo performance improvement is minimal. soft-start circuitry integrated into each ldo lim its the initia l ramp-up rate to about 30s/v to minimize current surge. the isl9008 provides short-circuit protection by limiting the output current to about 200ma (typ). the ldo uses an independently tr immed 1v reference as its input. an internal resi stor divider drops t he ldo output voltag e down to 1v. this is compared to the 1v reference for regulation . the resistor division ratio is programmed in the factory. overheat detection the bandgap outputs a proportion al-to-temperature current that is indicative of the temp erature of the silicon. this current is compared with refer ences to determine if the device is in danger of damage due to overheating. when the die temperature reache s about +140c, the ldo momentarily shuts down until the die cools sufficiently. in the overheat condition, if the ldo sources more than 50ma it will be shut off. once the die temperature falls back below about +110c, the disabled ldo is re-enabled and soft-start automatically takes place.
isl9008 fn9235 rev 1.00 page 10 of 10 march 11, 2008 small outline transistor plastic packages (sc70-5) d e 1 e e1 c l c c l e b c l a2 a a1 c l 0.20 (0.008) m 0.10 (0.004) c c -c- seating plane 4 5 123 view c view c l r1 r 4x ? 1 4x ? 1 gauge plane l1 seating ? l2 c plane c base metal with c1 b1 plating b 0.4mm 0.75mm 0.65mm 2.1mm typical recommended land pattern p5.049 5 lead small outline transistor plastic package symbol inches millimeters notes min max min max a 0.031 0.043 0.80 1.10 - a1 0.000 0.004 0.00 0.10 - a2 0.031 0.039 0.80 1.00 - b 0.006 0.012 0.15 0.30 - b1 0.006 0.010 0.15 0.25 c 0.003 0.009 0.08 0.22 6 c1 0.003 0.009 0.08 0.20 6 d 0.073 0.085 1.85 2.15 3 e 0.071 0.094 1.80 2.40 - e1 0.045 0.053 1.15 1.35 3 e 0.0256 ref 0.65 ref - e1 0.0512 ref 1.30 ref - l 0.010 0.018 0.26 0.46 4 l1 0.017 ref. 0.420 ref. - l2 0.006 bsc 0.15 bsc ? 0 o 8 o 0 o 8 o - n5 55 r 0.004 - 0.10 - r1 0.004 0.010 0.15 0.25 rev. 3 7/07 notes: 1. dimensioning and tolerances per asme y14.5m-1994. 2. package conforms to eiaj sc70 and jedec mo-203aa. 3. dimensions d and e1 are exclusiv e of mold flash, protrusions, or gate burrs. 4. footlength l measured at reference to gauge plane. 5. ?n? is the number of terminal positions. 6. these dimensions apply to the flat section of the lead between 0.08mm and 0.15mm from the lead tip. 7. controlling dimension: millime ter. converted inch dimen- sions are for reference only.
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