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? 2015 semtech corporation power management 1 SC4212B very low input /very low dropout 1 amp regulator features input voltage range from 1.6v to 6.0v 150mv maxi mum dropout @ 1a adjustable output from 0.5v with 1% accuracy 12a quiescent current in shutdown enable input 250s internal soft-start over current and over temperature protection reverse blocking from output to input full industrial temperature range 3mm x 3mm x 1mm mlpd-8 package fully weee and rohs compliant applications telecom and networking cards motherboards and peripheral cards industrial applications wireless infrastructure medical equipment ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? description the SC4212B is a high performance linear voltage regula - tor designed for applications requiring very low dropout voltage at load currents up to 1 ampere. it operates with vin as low as 1.6v and up to 6v, making it useful for a wide range of different applications and rails. the output voltage is programmable down to 0.5v, set via an external resistor divider, or to a fxed setting of 0.5v depending upon how the fb pin is confgured. the SC4212B has an enable pin to further reduce power dissipation while shut down. protection features include over current protection, over temperature protection and reverse blocking from output to input. the SC4212B is available in a 3mm x 3mm mlpd-8 package. typical application circuit rev. 2.0 s c 4 2 1 2 b c 1 c 2 v in e n v o f b g n d e n v in v o v o = 0 . 5 v s c 4 2 1 2 b c 1 c 2 v in e n v o f b g n d e n v in v o r 1 r 2 v o = 0 . 5 ( r 1 + r 2 ) r 2 c 3 r 2 * c 3 is a placeholder
SC4212B 2 pin confguration marking information ordering information device package SC4212Bmltrc (1)(2) 3mm x 3mm x 1mm mlpd-8 SC4212Bevb evaluation board notes: (1) available in tape and reel only. a reel contains 3,000 devices. (2) available in lead-free package only. device is weee and rohs compliant and halogen free. 3mm x 3mm x 1mm mlpd-8 ja = 36.3c/w yyww = datecode ( example : 1352 ) xxxx = semtech lot no. ( example : 2932 ) 212b yyww xxxx nc gnd fb vo nc 8 7 6 5 1 2 3 4 en vin nc top view
SC4212B 3 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. notes: (1) tested according to standard ansi/esda/jedec js-001-2012. (2) tested according to standard jesd-c101e. (3) 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. absolute maximum ratings vin, vo to gnd (v) . . . . . . . . . . . . . . . . . . . . . . . . . . -0.3 to 6.5 en to gnd (v) . . . . . . . . . . . . . . . . . . . . . . . . . -0.3 to vin + 0.3 fb to gnd (v) . . . . . . . . . . . . . . . . . . . . . . . . . -0.3 to vin + 0.3 power dissipation . . . . . . . . . . . . . . . . . . . . . internally limited esd protection level hbm (1) (kv) . . . . . . . . . . . . . . . . . . . 4 esd protection level cdm (2) (kv) . . . . . . . . . . . . . . . . . . . 1 recommended operating conditions vin (v) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1.6 v in 6.0 junction temperature range (c) . . . . . . . . . -40 t j +125 output current range . . . . . . . . . . . . . . . . . . . 50 a i o 1a thermal information unless noted otherwise t j = 25 c for typical, -40 c < t j < 125 c for min and max. v en = v in , v fb = v o , v in = 1.6v to 6.0v, c in =10f, c out =10f. parameter symbol conditions min typ max units vin v in operating range (1) 1.6 6.0 v quiescent current i q v in = 3.3v, i o = 0a 325 680 a i o = 1a 2 ma v en =0v 12 50 a feedback feedback voltage (2) v fb i o = 10ma to 1a 0.495 0.500 0.505 v feedback pin current i fb v fb = v out 80 200 na vo line regulation (2) i o = 10ma 0.01 0.2 %/v load regulation (2) i o = 10ma to 1a 0.21 1.0 % electrical characteristics thermal resistance, junction to ambient (3) ( c/w ) . . 36.3 thermal resistance, junction to case ( c/w ) . . . . . . . . 3.77 storage temperature ( c ) . . . . . . . . . . . . . . . . . . . -65 to +150 peak ir reflow temperature ( 10s to 30s ) . . . . . . . . . . +260
SC4212B 4 parameter symbol conditions min typ max units dropout voltage (3) v do i o =0.5a 1.6v v in < 2.2v 86 mv 2.2v v in 6.0v 75 i o = 1a 1.6v v in < 2.2v 175 2.2v v in 6.0v 150 current limit i cl 1.2 2.6 a en enable pin current i en v en = 0v, v in = 1.6v to 6.0v 1.5 10 a v en = v in 80 200 na enable pin threshold v ih v in = 1.6v to 6.0v 1.2 v v il 0.4 over temperature protection high trip level t hi 150 o c hysteresis t hyst 10 o c electrical characteristics (continued) notes: (1) minimum v in = v out + v do or 1.6v, whichever is greater. (2) low duty cycle pulse testing with kelvin connections required. (3) v do = v in - v o when v fb = gnd.
SC4212B 5 pin descriptions pin # pin name pin function 1, 4, 5 nc no connection. do not connect to any node electrically. 2 en enable input. driving this pin high turns on the regulator. driving this pin low shuts of the regula - tor. if not driven from a control circuit, tie this pin directly to the vin pin, or via a resistor up to 400k. 3 vin input supply pin. a large bulk capacitance should be placed close to this pin to ensure that the input supply does not sag below the minimum v in . 6 vo regulator output pin. refer to the applications information section for output capacitor selection. 7 fb input of the error amplifer. this pin is used to set the output voltage (see typical application circuits on page 1). 8 gnd ground pin. thermal pad the exposed pad enhances thermal performance and is not electrically connected inside the pack - age. it is recommended to connect the exposed pad to the ground plane using multiple vias. block diagram o ve r - cu rre n t a n d th e rm a l sh u td o w n c ircu itry e n a b le c ircu itry r e ve rse p o la rity p ro te ctio n c ircu itry v r e f c ircu itry g n d f b v o v in e n
SC4212B 6 typical characteristics dropout voltage at vin = 1.6v dropout voltage at vin = 6.0v dropout voltage at vin = 2.2v current limit threshold input under-voltage lockout threshold shutdown current 1a 0.5a 0.5a 1a 0.5a 1a vin rising threshold vin falling threshold vin = 6.0v vin = 3.3v vin = 1.6v unless noted otherwise c in =10f/10v x7r 0805, c out =10f/10v x7r 0805.
SC4212B 7 typical characteristics (continued) quiescent current enable rising threshold output rise time enable falling threshold power supply ripple rejection output spectral noise density vin = 1.8v, vo = 0.5v rl = 50 unless noted otherwise c in =10f/10v x7r 0805, c out =10f/10v x7r 0805. io = 0a
SC4212B 8 introduction the SC4212B 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 area. additional features include an enable pin to allow for a very low power consumption in standby mode, and a fully adjustable output. v o setting: v o = v ref by connecting the fb pin directly to the vo pin, the output voltage will be regulated to the 0.5v internal reference. in this confguration, r2 should be 10k. v o setting with external resistors the use of 1% resistors, and designing for a current fow 50a is recommended to ensure a well regulated output (thus r 2 10k). r 1 can then be calculated from r 1 = r 2 (v o -v ref )/v ref enable pulling this pin below 0.4v turns the regulator of, reduc - ing the quiescent current to a fraction of its operating value. driving this pin high enables the regulator. a pull up resistor 400k should be connected from this pin to the vin pin in applications where the enable pin is not driven from a control circuit. input capacitor a 10f x5r or x7r ceram ic capacitor, along with a 0.1f ceramic decoupling capacitor is recommended to be placed directly next to the vin pin. this allows for the device being some distance from the input source, reduc - ing the input droop due to load transients and improving load transient response. additional capacitance may be needed if large step, fast di/dt load transients are required or the ldo is located far away from the input source. output capacitor a 10f or larger x5r or x7r ceramic capacitor, along with a 0.1f ceramic decoupli ng capacitor is recommended. over-current and thermal shutdown the over-current protection and thermal shutdown func - tions protect the regulator against damage due to exces - sive power diss ipation. the SC4212B is designed to current limit when the output current reaches 1.6a (typical). when the load exceeds 1.6a, the output voltage is reduced to maintain a constant curren t limit. the thermal shutdown function limits the junction tem - perature to a maximum of 150 o c (typical). thermal shut - down turns of the regulator as the junction temperature reaches the high trip level of 150 o c . when the junction temperature drops below 140 o c (typical), the regulator is turned on once again. thermal considerations the power dissipation in the SC4212B is given by the fol - lowing equation: p d i o (v in - v o ) the allowable power dissipation will be dependant upon the thermal impedance achieved in the application. the derating curve below is valid for the thermal impedance specifed in the thermal information section on page 3. applications information figure 1. power derating curve
SC4212B 9 outline drawing 3mm x 3mm mlpd-8
SC4212B 10 land pattern 3mm x 3mm mlpd-8 x p z y h k g (c ) c o n t r o l l in g d im e n s io n s a r e in m il l im e t e r s (a n g l e s in d e g r e e s ). 1 . 3 . f a il u r e t o d o s o m a y c o m p r o m is e t h e t h e r m a l a n d /o r f u n c t io n a l p e r f o r m a n c e o f t h e d e v ic e . s h a l l b e c o n n e c t e d t o a s y s t e m g r o u n d p l a n e . t h e r m a l v ia s in t h e l a n d p a t t e r n o f t h e e x p o s e d p a d .0 30 .1 46 (.1 1 6) .1 02 .0 87 .0 67 0 .75 3 .70 (2 .9 5) 2 .20 2 .58 1 .70 0 .40 0 .65 .0 26 .0 16 t h is l a n d p a t t e r n is f o r r e f e r e n c e p u r p o s e s o n l y . c o n s u l t y o u r m a n u f a c t u r in g g r o u p t o e n s u r e y o u r c o m p a n y 's m a n u f a c t u r in g g u id e l in e s a r e m e t . n o t e s : 2 . in c h e s d im e n s io n s p z x y c g h k d im m il lim e t e r s
semtech corporation power management products division 200 flynn road, camarillo, ca 93012 phone: (805) 498-2111 fax: (805) 498-3804 www.semtech.com contact information SC4212B 11 ? semtech 2015 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 conse - quence of its use. publication thereof does not convey nor imply any license under patent or other industrial or intellec - tual 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 semtech and its ofcers, employees, subsidiaries, afliates, and distributors harmless against all claims, costs damages and attorney fees which could arise. notice: all referenced brands, product names, service names and trademarks are the property of their respective owners.

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