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? 2012 semtech corporation power management 1 SC4215J very low input /very low dropout 2 amp regulator with soft-start features input voltage as low as 1.4v 400mv dropout @ 2a adjustable output from 0.5v 1ms internal soft-start minimizes inrush current over current and over temperature protection enable function option 10a quiescent current in shutdown reverse blocking from output to input full industrial temperature range fully weee and rohs compliant applications telecom and networking cards motherboards and peripheral cards industrial applications wireless infrastructure medical equipment ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? description the SC4215J is a high performance positive voltage regu - lator designed for use in applications requiring very low input voltage and very low dropout voltage at up to 2 amperes. it operates with a vin as low as 1.4v, with output voltage programmable as low as 0.5v. the SC4215J fea - tures ultra low dropout, ideal for applications where vout is very close to vin. additionally, the SC4215J has an enable pin to further reduce power dissipation while shut down. the SC4215J provides excellent regulation over variations in line, load and temperature. the SC4215J is available in the soic-8-edp (exposed die pad) package. the output voltage can be set via an exter - nal divider or to a fxed setting of 0.5v depending upon how the fb pin is confgured. typical application circuit rev. 2.0 0 . 5 v 0 . 5 s c 4 2 1 5 j c 1 c 2 s c 4 2 1 5 j c 2 c 1 r 1 r 2 r 1 r 2 r 2
SC4215J 2 pin confguration marking information ordering information device package SC4215Jsetrt (1)(2) soic-8-edp SC4215Jevb evaluation board notes: (1) available in tape and reel only. a reel contains 2,500 devices. (2) available in lead-free package only. device is weee and rohs compliant and halogen free. s c 4 2 1 5 j
SC4215J 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 jedec standard jesd22-a114-b. (2) calculated from package in still air, mounted to x 4.5, 4 layer fr4 pcb with thermal vias under the exposed pad per jesd51 standards. absolute maximum ratings vin, en, vo, fb to gnd (v) . . . . . . . . . . . . . . . . . . -0. to +7.0 power dissipation . . . . . . . . . . . . . . . . . . . . . internally limited esd protection level (1) (kv) . . . . . . . . . . . . . . . . . . . . . . . . . . . 4 recommended operating conditions vin (v) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1.4 < v in < 6.0 junction temperature range (c) . . . . . . . . . -40 < t j < +125 maximum output current (a) . . . . . . . . . . . . . . . . . . . . . . . . . 2 thermal information thermal resistance, junction to ambient (2) (c/w) . . . . 6 thermal resistance, junc to case (2) (c/w) . . . . . . . . . . . . 5.5 maximum junction temperature (c) . . . . . . . . . . . . . . +150 storage temperature range (c) . . . . . . . . . . . . -65 to +150 peak ir refow temperature (10s to 0s) (c) . . . . . . +260 unless specifed: v en = v in , v fb = v o , v in = 1.40v to 6.0v, i o = 10a to 2a, t j = 25 c. values in bold apply over the full operating temperature range. parameter symbol conditions min typ max units v in operating range (1) 1.4 6.0 v quiescent current i q v in = . v, i o = 0a 3 ma v in = 6.0v, v en =0v 10 50 a dropout voltage (2)() v do i o =1a 1.4v v in < 1.6v 90 400 mv 1.6v v in 6.0v 200 i o =1.5a 1.4v v in < 1.6v 200 500 1.6v v in 6.0v 300 i o = 2a 1.4v v in < 1.6v 00 600 1.6v v in 6.0v 400 minimum load current (4) i o 10 a current limit i cl 2.1 4.4 a electrical characteristics
SC4215J 4 parameter symbol conditions min typ max units feedback reference voltage (2) v ref v in = . v, i o =10ma 0.495 0.500 0.505 v 0.490 0.510 0.485 0.515 line regulation i o = 10ma 0.2 %/v load regulation (5) i o = 10ma to 2a 0. % feedback pin current v fb = v ref 80 200 na en enable pin current i en v en = 0v, v in =.v 1.5 10 a enable pin threshold v ih v in =.v 1.6 v v il 0.4 over temperature protection high trip level t hi 160 o c hysteresis t hyst 10 o c soft-start soft-start time (6) t ss 0.7 1 ms electrical characteristics (continued) notes: (1) minimum v in = v out + v do or 1.4v, whichever is greater. (2) low duty cycle pulse testing with kelvin connections required. ( ) v do = v in -v o when v o decreases by 1.5% of its nominal output voltage with v in = v o +0.8v. (4) required to maintain regulation. voltage set resistors r 1 and r 2 are usually utilized to meet this requirement. (5) where the power dissipation does not exceed the maximum rating of the package. refer to figure 1 on page 8. (6) time taken for the output to rise from 0% to 95% of the programmed output voltage.
SC4215J 5 typical characteristics dropout voltage at v o = 3.3v current limit vs temperature dropout voltage at v o = 1.5v 0 .0 0 .5 1 .0 1 .5 2 .0 2 .5 3 .0 3 .5 -5 0 0 5 0 1 0 0 1 5 0 temperature ( o c) ilim (a) startup time vs temperature 0 2 0 0 4 0 0 6 0 0 8 0 0 1 0 0 0 1 2 0 0 -5 0 0 5 0 1 0 0 1 5 0 temperature ( o c) tss (us) en threshold vs v in power-supply ripple rejection vs frequency 0 .0 0 .4 0 .8 1 .2 1 .6 2 .0 1 .0 2 .0 3 .0 4 .0 5 .0 6 .0 input voltage v in (v) enable on threshold (v) -40 o c 25 o c 125 o c 0 1 0 2 0 3 0 4 0 5 0 6 0 7 0 1 0 0 .0 e+0 1 .0 e+3 1 0 .0 e+3 1 0 0 .0 e+3 1 .0 e +6 1 0 .0 e+6 frequency (hz) psrr(db) io= 2a io= 0.1a v in = 5.0v, v out = 3.3v 2 5 c 0 . 0 0 . 1 0 . 2 0 . 3 0 . 4 0 . 0 0 . 5 1 . 0 1 . 5 2 . 0 load current ( a ) d r o p o u t v o l t a g e ( v ) 1 2 5 c - 4 0 c 2 5 c 1 2 5 c - 4 0 c 0 . 0 0 . 1 0 . 2 0 . 3 0 . 4 d r o p o u t v o l t a g e ( v ) 0 . 0 0 . 5 1 . 0 1 . 5 2 . 0 load current ( a )
SC4215J 6 pin descriptions pin # pin name pin function 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 to the vin pin. 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 . also a minimum of 4.7uf ceramic capacitor should be placed directly at this pin. 6 vo regulator output pin. refer to the applications information section for output capacitor selection. 7 fb inverting input of the error amplifer. this pin is used to set the output voltage (see typical applica - tion circuits on page 1). 8 gnd ground pin. 1, 4, 5 nc no connection. thermal pad the exposed pad enhances thermal performance and is not electrically connected to gnd inside the package. it is recommended to connect the exposed pad to the ground plane. block diagram s s
SC4215J 7 applications information introduction the SC4215J 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. noise immunity in very electrically noisy environments, it is recommended that 0.1f ceramic capacitors be placed from vin to gnd and vo to gnd as close to the device pins as possible. 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. v o setting with external resistors the use of 1% resistors, and designing for a current fow f 10a is recommended to ensure a well regulated output (thus r 2 50k). a suitable value for r 2 can be chosen in the range of 1k to 50k. r 1 can then be calculated from. 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 up to 400kohms 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 large bulk capacitance f 10f/a (output load) should be placed close to the input supply pin of the SC4215J to ensure that v in does not drop below the minimum v in . also a minimum of 4.7f ceramic capacitor is recommended to be placed directly next to the vin pin. this allows for the ( ) 5( ) 5( ) 2 9 9 9 5 5 ? ? = ( ) 5( ) 5( ) 2 9 9 9 5 5 ? ? = device being some distance from any bulk capacitance on the rail. additionally, the input droop due to load tran - sients is reduced, improving load transient response. additional capacitance may be added if required by the application. output capacitor a minimum bulk capacitance of 10f/a (output load), along with a 0.1f ceramic decoupling capacitor is recom - mended. for v o less than 0.6v, a minimum bulk capaci - tance of 40f, along with a 0.1f ceramic decoupling capacitor is recommended. the use of multiple 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 SC4215J is extremely tolerant of output capacitor esr values and thus will also work comfortably with tantalum output capacitors. soft-start the soft-start is achieved by using a voltage ramp as the voltage reference for the internal error amplifer during startup. this voltage ramp is created by an internal current source charging an internal soft-start capacitor. when the voltage ramp reaches 500mv, the voltage reference for the internal error amplifer switches to the fxed 500mv v ref . thus, during soft-start, the output tracks the internal voltage ramp, which limits the input inrush current and provides a programmed soft-start profle for a wide range of applications. over-current and thermal shutdown the over-current protection and thermal shutdown func - tions protect the regulator against damage due to exces - sive power dissipation. the SC4215J is designed to current limit when the output current reashes a (typical). when the load exceeds a, the output voltage is reduced to maintain a constant current limit. the thermal shutdown function limits the junction tem - perature to a maximum of 160 o c (typical). thermal shut - down turns of the regulator as the junction temperature begins to exceed 160 o c . when the junction temperature
SC4215J 8 drops below 150 o c (typical), the regulator is turned on again. thermal considerations the power dissipation in the SC4215J 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 . figure 1. power derating curve applications information (cont.)
SC4215J 9 outline drawing soic-8-edp-2
SC4215J 10 land pattern soic-8-edp-2
semtech corporation power management products division 200 flynn road, camarillo, ca 9 012 phone: (805) 498-2111 fax: (805) 498- 804 www.semtech.com contact information SC4215J 11 ? semtech 2012 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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