power management 1 sc4212 very low input /very low dropout 1amp regulator with enable april 27, 2010 features ? input voltage as low as 1.5v ? 400mv dropout @ 1a ? adjustable output from 0.5v ? over current and over temperature protection ? enable pin ? 10a quiescent current in shutdown ? low reverse leakage (output to input) ? full industrial temperature range ? available in mlpd-8 pb-free package, fully weee and rohs compliant applications ? telecom/networking cards ? motherboards/peripheral cards ? industrial applications ? wireless infrastructure ? set top boxes ? medical equipment ? notebook computers description the sc4212 is a high performance positive voltage regu - lator designed for applications requiring very low input voltage and very low dropout voltage at up to 1 ampere. it operates with a vin as low as 1.5v, with output voltage programmable as low as 0.5v. the sc4212 features ultra low dropout, ideal for applications where vout is very close to vin. additionally, the sc4212 has an enable pin to further reduce power dissipation while shutdown. the sc4212 provides excellent regulation over variations in line, load and temperature. the sc4212 is available in a 3 x 3 mlpd-8 package. the output voltage can be set via external divider or to a fixed setting of 0.5v depending upon how the fb pin is configured. typical application circuit 1 vout vout vout vout fb fbfb fb gnd gnd gnd gnd vin vinvin vin en enen en sc4212 sc4212 sc4212 sc4212 c1 c1c1 c1 vin vinvin vin enable enable enable enable c2 c2c2 c2 vout vout vout vout r1 r1r1 r1 r2 r2r2 r2 ( ) ( ) volts r r r vout 2 2 1 5.0 + = vout vout vout vout fb fbfb fb gnd gnd gnd gnd vin vinvin vin en enen en sc4212 sc4212 sc4212 sc4212 c1 c1c1 c1 vin vinvin vin enable enable enable enable c2 c2c2 c2 vout vout vout vout v vout 5.0 =
sc4212 2 pin confguration marking information ordering information part number package sc4212mltrt (1)(2) 3mm x 3mm x 1mm mlpd-8 SC4212EVB evaluation board notes: (1) only available in tape and reel packaging. a reel contains 3000 devices. (2) pb-free product. this product is fully weee and rohs compliant. ja = 36.3c/w 3mm x 3mm x 1mm mlpd-8 1 2 3 4 8 7 6 5 t top view nc en vin nc gnd fb vout nc marking for the 3 x 3mm mlpd 8ld lead package: yyww = datecode ( example : 0952 ) xxxx = semtech lot no. ( example : e901 )
sc4212 3 notes: (1)calculated from package in still air, mounted to 3 x 4.5, 4 layer fr4 pcb with thermal vias under the exposed pad per jesd51 standards. (2)tested according to jedec standard jesd22-a114-b. unless specifed otherwise: fb = v out , en = vin = , 1.5v to 5.5v, i out = 10 a to 1a, t a = +25c for typ , -40 to +85 c for min and max, t j < 125c . electrical characteristics absolute maximum ratings vin to gnd ............... -0.3v to 7v en, fb, vout ...... -0.3v to vin +0.3v esd rating (2) ......... 3.5kv recommended operating conditions thermal resistance, junction to ambient (1) .. 36.3c/w thermal resistance, junction to case............. 3.77c/w operation ambient temperature range...-40 to +85c operation junction temperature range ..-40 to+125c storage temperature ......-65 to +150c peak ir reflow temperature (10s to 30s)........+260 thermal information parameter symbol conditions min typ max units input supply input supply voltage v in 1.5 5.5 v quiescent current i q v in = 3.3v, i out = 0a 3 ma vin = 5.5v, en = 0v 15 a output output voltage (1) vout vin = 3.3v, i out = 10ma, t a = 25 c -2% vout +2% v 1.5v < vin < 5.5v, i out = 10ma -3% +3% line regulation (1) reg (line) i out = 10ma 0.20 0.40 %/v load regulation (1) reg (load) i out = 10ma to1a 0.50 1.50 %/a minimum load current (3) i out vin = vout + 0.5v 10 a current limit i cl 1.10 1.5 a dropout voltage (1)(2) v do i out = 500ma, t a = 25c 100 250 mv i out = 500ma 300 i out = 1a, t a = 25 c 200 400 i out = 1a 500 supply input voltage ...... 1.5 to 5.5v maximum output current .............. 1a junction temperature ..... -40 to +125c exceeding the above specifcations may result in permanent damage to the device or device malfunction. operation outside of the parameters specifed in the electrical characteristics section is not recommended.
sc4212 4 electrical characteristics (continued) parameter symbol conditions min typ max units feedback reference voltage (1) v ref vin = 3.3v, fb = vout , i out = 10ma, t a = 25c 0.495 0.500 0.505 v 0.490 0.510 feedback pin current i fb fb = v ref 80 200 na enable enable input high current i en en = 0v, vin = 3.3v 1.5 10.0 a enable input threshold v ih vin = 3.3v 1.6 v v il vin = 3.3v 0.5 over temperature protection high trip level t ot 160 c hysteresis t ot_hys 10 c notes: (1) low duty cycle pulse testing with kelvin connections required. (2) v do = vin - vout when vout decreases by 1.5% of its nominal output voltage when vin = vout + 0.8v. (3) required to maintain regulation. voltage set resistors r1 and r2 are usually utilized to meet this requirement.
sc4212 5 typical characteristics typixcal droop voltage at vin = 1.5 v 0 50 100 150 200 250 300 350 400 450 0.0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1.0 iout (a) droop voltage (m v) t a = 125 c t a = 25 c t a = -40 c typical dropout voltage at vin = 1.5 v dropout voltage (mv) i out (a) i out (a) reference vs temperature 495 496 497 498 499 500 501 502 503 504 505 -50 -25 0 25 50 75 100 125 vin = 5.5v temperature (oc) reference voltage vs. junction temperature reference voltage (mv) t j (oc) reference vs temperature 498 499 500 501 502 503 504 505 506 -50 -25 0 25 50 75 100 125 temperature (oc) vin = 1.5v reference voltage (mv) t j (oc) reference voltage vs. junction temperature stability curve, cout = 10 f stability curve, cout = 100 f i out (a) i out (a) typical dropout voltage at vin = 5.0 v dropout voltage (mv) typixcal droop voltage at vin = 5.0 v 0 50 100 150 200 250 300 350 0.0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1.0 iout (a) droop voltage (mv) t a = 125 c t a = 25 c t a = -40 c
sc4212 6 pin descriptions pin # pin name pin function 1,4,5 nc no connect. 2 en enable input. pulling this pin below 0.5v turns the regulator of, reducing the quiescent current to a frac - tion of its operating value. the device will be enabled if this pin is left open. connect to vin if the enable feature is not being used. 3 vin input voltage pin. for regulation at full load, the input to this pin must between ( vout + 0.5v ) and 5.5v. minimum vin = 1.5v . a large bulk capacitance should be placed close to this pin to ensure that the input supply does not sag below 1.5v. also a minimum of 4.7f ceramic capacitor should be placed directly at this pin. 6 vout this pin is the power output of this device. a minimum 10f capacitor should be placed directly at this pin. 7 fb when this pin is connected to the vout pin , the output voltage will be set to 0.5v . if external feedback resistors are used , the output voltage will be determined by the resistor ratio (see application circuits on page1): 8 gnd reference ground. the gnd pin and the thermal pad must be connected together at the ic. t thermal pad thermal pad for heatsinking purposes. not connected internally. connect to ground plane using multiple vias. block diagram volts r ) r (r 0.5 v 2 2 1 out + ? = r 1 : the resistor connected from vout to fb. r 2 : the resistor connected from fb to gnd. 5 5 4 4 3 3 2 2 1 1 d d c c b b a a vpump vin vin vin vout title size document number rev date: sheet of a 1 1 friday, april 30, 2010 title size document number rev date: sheet of <doc> <revcode> <title> a 1 1 friday, april 30, 2010 title size document number rev date: sheet of <doc> <revcode> <title> a 1 1 friday, april 30, 2010 reference thermal shutdown reverse voltage shutdown 1.5ua 0.5v fb gnd vout vin en - + - + - + - + rsense rsense + - + -
<br> sc4212 7 applications information introduction the sc4212 is intended for applications where high current capability and very low dropout voltage are required. it provides a very simple, low cost solution that uses very little pcb real estate. additional features include an enable pin to allow for a very low power con - sumption standby mode, and a fully adjustable output. component selection input capacitor : a large bulk capacitance of 10 f should be placed close to the input supply pin of the sc4212 to ensure that vin does not sag below 1.5v. also a minimum 4.7f ceramic capacitor is recommended to be placed directly next to the vin pin. this allows for the device being some distance fromany bulk ca - pacitance on the rail. additionally, input droop due to load transients is reduced, improving load transient response. additional capacitance may be added if re - quired by the application. output capacitor: a minimum bulk capacitance of 10f, along with a 0.1f ceramic decoupling capacitor is recommended. increasing the bulk capacitance will improve the overall transient response.the use of mul - tiple lower value ceramic capacitors in parallel to achieve the desired bulk capacitance will not cause stability issues. although designed for use with ceramic output capacitors, the sc4212 is extremely tolerant of output capacitor esr values and thus will also work comfortably with tantalum output capacitors. noise immunity: in very electrically noisy environments, it is recommended that 0.1 f ceramic capacitors be placed from vin to gnd and vout to gnd as close to the device pins as possible. external voltage selection resistors: the use of 1% resistors designed for a current flow 10 a is recom - mended to ensure a well-regulated output (thus r2 50k ? ). enable: pulling the en pin below 0.5v turns the regula - tor off, reducing the quiescent current to a fraction of its operating value. a pull up resistor up to 400k should be connected from the en pin to the vin pin in appli ca tion where an input voltage of < 1.9v is required. for applica - tions with input voltages higher than 1.9v, the en pin could be left open or connected to vin. thermal considerations the power dissipation in the sc4212 is approximately equal to the product of the output current and the input to output voltage differenti al: the absolute worst-case dissipation is given by: q(max) (max) out(max) (min) (max) o(max) i vin i ) vout (vin p ? + ? ? = for a typical scenario, vin = 3.3v 5%, vout = 2.8v and i out = 1a, therefore: vin (max) = 3.465v, vout (min) = 2.744v and i q(max) = 3ma thus p d(max) = 0.731w. using this figure, and assuming t a(max) = 70c, we can calculate the maximum thermal impedance allowable to maintain t j 125c: w c 75 0.731w c 70 c 125 p t t r o(max) a(max) j(max) a)(max) th(j = ? ? ? ? ? ? ? = ? ? ? ? ? ? ? ? ? = ? t his should be achievable with the 3mm x 3mm mlpd-8 package using pcb copper area to aid in conducting the heat away, such as one square inch of copper connected to the ground pins of the device. internal ground/power planes and air flow will also assist in removing heat. for higher ambient tempertures it may be necessary to use additional copper area. out o i vout) (vin p ? ? =
<br> sc4212 8 x p z y h k g (c) controlling dimensions are in millimeters (angles in degrees). 1. 3. failure to do so may compromise the thermal and/or functional performance of the device. shall be connected to a system ground plane. thermal vias in the land pattern of the exposed pad .030 .146 (.116) .102 .087 .067 0.75 3.70 (2.95) 2.20 2.58 1.70 0.40 0.65 .026 .016 this land pattern is for reference purposes only. consult your manufacturing group to ensure your company's manufacturing guidelines are met. notes: 2. inches dimensions p z x y c g h k dim millimeters outline drawing 3mm x 3mm mlpd-8 land pattern 3mm x 3mm mlpd-8
<br> contact information semtech corporation power management products division 200 flynn road, camarillo, ca 93012 phone: (805) 498-2111 fax: (805) 498-3804 www.semtech.com sc4212 9 ? semtech 2010 all rights reserved. reproduction in whole or in part is prohibited without the prior written consent of the copyright owner. the information presented in this document does not form part of any quotation or contract, is believed to be accurate and reliable and may be changed without notice. no liability will be accepted by the publisher for any consequence of its use. publication thereof does not convey nor imply any license under patent or other industrial or intellectual property rights. semtech assumes no responsibility or liability whatsoever for any failure or unexpected operation resulting from misuse, neglect improper installation, repair or improper handling or unusual physical or electrical stress including, but not limited to, exposure to parameters beyond the specifed maximum ratings or operation outside the specifed range. semtech products are not designed, intended, authorized or warranted to be suitable for use in life- support applications, devices or systems or other critical applications. inclusion of semtech products in such applications is understood to be undertaken solely at the customers own risk. should a customer purchase or use semtech products for any such unauthorized application, the customer shall indemnify and hold sem - tech and its ofcers, employees, subsidiaries, afliates, and distributors harmless against all claims, costs damages and attorney fees which could arise.
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