SC724/SC725 2A Low Vin, Very Low Ron Load Switch POWER MANAGEMENT Features Description Input Voltage Range – 1.1V to 3.6V 2A Continuous Output Current Ultra-Low Ron – 36mΩ Automatic Output Discharge Circuit Fast Turn-on Option With No Output Discharge Circuit – SC724 Extended Soft Start Option With Automatic Output Discharge Circuit – SC725 Low Quiescent Current – 0.81µA(Typ.) Low Shutdown Current < 1µA – SC724 1.1V Logic Level Enable Compatible With CMOS/GPIO Control Hardened ESD Protection 3kV Package: CSP – 0.76mm × 0.76mm, 0.4mm Pitch Applications The SC724/SC725 is a low input voltage, very low Ron load switch designed for use in battery powered applications. Very low quiescent current of less than 2µA, and a low shutdown current of less than 1µA (SC724) reduces power loss during Standby and Off states. A logic level Enable allows low voltage on/off control down to 1.1V. The SC724 provides a quick turn on time, while the SC725 provides a longer soft start to limit inrush current. The SC725 also features an automatic discharge circuit which discharges the output when the part is disabled. The SC724/SC725 is offered in an ultra-small 4-bump 0.76mm × 0.76mm Chip Scale Package (CSP) which enables very small board area implementations. The SC724/SC725 has an operating ambient temperature range of -40°C to +85°C. SC724/SC725 offers an alternative bump connection pattern to SC724/SC725. Please go to Semtech.com website for details. Smart Phones Tablet PCs GPS Devices Battery Powered Equipment Other Portable Device Automatic Rising Time Discharge Device Package SC724 CSP No 3µs(Typ.) SC725 CSP Yes 140µs(Typ.) Typical Application Circuit SUPPLY VIN 1µF ENABLE Rev. 2.0 1µF SC724 / SC725 EN LOAD VOUT GND © 2014 Semtech Corporation SC724/SC725 Pin Configuration Ordering Information T O P V IE W (B U M P S O N T H E B O T T O M ) A1 A2 B1 B2 Device Package SC724CSTRT CSP 0.76mm×0.76mm 4-bump SC725CSTRT CSP 0.76mm×0.76mm 4-bump SC724EVB Evaluation Board SC725EVB Evaluation Board Notes: (1) Available in tape and reel only. A reel contains 5,000 devices. (2) Lead-free packaging only. Device is WEEE and RoHS compliant, and halogen free. CSP 0.76x0.76, 4 Bump Pin Descriptions Pin # Pin Name A1 VIN Input Voltage. B1 EN Enable input. A 5.0MΩ internal resistor is connected from this pin to GND. Drive HIGH to turn on the switch; drive LOW to turn off the switch. When the EN pin is floated, the switch is OFF. A2 VOUT Output Voltage. B2 GND Ground. Pin Function SC724/SC725 Marking Information(SC724) Marking Information(SC725) Marking for the 0.76 x 0.76 mm CSP 4 Lead Package : Marking for the 0.76 x 0.76 mm CSP 4 Lead Package : O = Pin 1 ID O = Pin 1 ID nn = Part No. Code (Example: AR) - Reference Part No. nn = Part No. Code (Example: AT) - Reference Part No. SC724/SC725 Absolute Maximum Ratings Recommended Operating Conditions VIN to GND (V) . . . . . . . . . . . . . . . . . . . . . . . . . . . . -0.3 to +4.3 Ambient Temperature Range (°C). . . . . . . . . -40 < TA < +85 EN to GND (V). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -0.3 to +4.3 VVIN (V). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1.1 to 3.6 OUT to GND (V) . . . . . . . . . . . . . . . . . . . . . . . . . .-0.3 to +VVIN Maximum Output Current (A). . . . . . . . . . . . . . . . . . . . . . . . . 2 ESD Protection Level (kV) . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3 (1) Thermal Information Thermal Resistance, Junction to Ambient(2) (°C/W) . . . 160 Maximum Junction Temperature (°C). . . . . . . . . . . . . . . +125 Storage Temperature Range (°C). . . . . . . . . . . . . -65 to +150 Peak IR Reflow Temperature (10s to 30s) (°C) . . . . . . . . +260 Exceeding the above specifications may result in permanent damage to the device or device malfunction. Operation outside of the parameters specified in the Electrical Characteristics section is not recommended. NOTES: (1) Tested according to JEDEC standard JS-001-2012. (2) Calculated from package in still air, mounted to 3 x 4.5 (in), 4 layer FR4 PCB with thermal vias under the exposed pad per JESD51 standards. Electrical Characteristics Unless noted otherwise, TA = 25°C for typical, -40°C < TA = TJ < 85°C for min and max. VVIN = 1.8V, CIN = 1μF, COUT = 1μF, VEN = VVIN. Parameter On Resistance (Ron) Quiescent Current (1) Symbol RON IQ Conditions Min Typ Max Units VVIN =3.6V, IOUT = 200mA, V �EN =1.5V 24 mΩ VVIN =2.5V, IOUT = 200mA, V �EN =1.5V 29 mΩ VVIN =1.8V, IOUT = 200mA, V �EN =1.5V 36 VVIN =1.5V, IOUT = 200mA, V �EN =1.5V 43 mΩ VVIN =1.2V, IOUT = 200mA, V �EN =1.0V 57 mΩ VVIN = VEN = 3.6V, VOUT = open 0.81 47 2 mΩ µA Enable EN Input High Threshold VEN-IH EN Input Low Threshold VEN-IL EN Input Pull-Down Resistance 1.1 V 0.3 REN 5.0 V MΩ SC724 Shutdown Current ISD VEN =0V, VOUT = open 1 µA VEN =0V, VOUT = open, TA = 25�� °C 0.2 µA SC724/SC725 Electrical Characteristics (continued) Parameter Symbol Turn-on Delay Time TDT Rising Time TRT Conditions Min Typ Max Units VVIN =1.8V, IOUT = 200mA, V �EN =1.5V, COUT=1µF 11 µs VVIN =3.6V, IOUT = 200mA, V �EN =1.5V, COUT=1µF 2.8 µs VVIN =1.8V, IOUT = 200mA, V �EN =1.5V, COUT=1µF 8.5 µs VVIN =3.6V, IOUT = 200mA, V �EN =1.5V, COUT=1µF 3 µs SC725 Shutdown Current ISD Turn-on Delay Time TDT Rising Time Output Pull-Down Resistance TRT VEN =0V, VOUT = open 8 µA VEN =0V, VOUT = open, TA = 25�� °C 0.6 µA VVIN =1.8V, IOUT = 200mA, V �EN =1.5V, COUT=1µF 240 µs VVIN =3.6V, IOUT = 200mA, V �EN =1.5V, COUT=1µF 110 µs VVIN =1.8V, IOUT = 200mA, V �EN =1.5V, COUT=1µF 250 µs VVIN =3.6V, IOUT = 200mA, V �EN =1.5V, COUT=1µF 140 µs VVIN =1.8V 220 Ω RPD Notes: (1) IQ current includes EN pull-down current. Timing Diagram Turn-on Delay Turn-off Delay VEN VOUT 90% 10% Rising Time Falling Time (Turn on time)=(Turn-on Delay)+(Rising Time) StartupbyEN StartupbyEN SC724/SC725 Testingcondition:VIN=3.6V,25Ԩ, Testingcondition:VIN=3.6V,25Ԩ, Shutdown by VIN Iout=2A,C1=C2=1uF,CRMode Iout=2A,C1=C2=1uF,CRMode Testingcondition:VIN=1.8V,25Ԩ, Testingcondition:VIN=1.8V,25Ԩ, Start up by VIN Iout=2A,C1=C2=1uF,CRMode Iout=2A,C1=C2=1uF,CRMode VIN VOUT Testing condition: VIN=3.6V, Iout=0.5A, C2=1uF, 25Ԩ, Typical Characteristics (SC724) 3.6Vin,1.8Ω Start Up by VIN VIN VIN VIN VOUT VOUT IIN VOUT IIN 3.6Vin,1.8Ω VIN 1V/div. VOUT 1V/div. Shut Down by VIN Testing condition: VIN=3.6V, Iout=0.5A, C2=1uF, CR mode, 25ɗ IIN VIN VOUT VIN 1V/div. VOUT 1V/div. EN Iin EN IOUT IIN 1A/div. T5(Vin) T6(Vout) IIN 1A/div. EN IOUT 1A/div. Iout Iin IOUT IOUT 1A/div. Time (5ms/div) Time (5ms/div) Testingcondition:VIN=1.8V,25Ԩ, Testingcondition:VIN=1.8V,25Ԩ, Iout=2A,C1=C2=1uF,CRMode Start Up by EN Iout=2A,C1=C2=1uF,CRMode 1.8Vin, 0A Testingcondition:VIN=3.6V,25Ԩ, Testingcondition:VIN=3.6V,25Ԩ, Iout=2A,C1=C2=1uF,CRMode Start Up by EN Iout=2A,C1=C2=1uF,CRMode 3.6Vin,0A VIN VIN VIN VOUT VOUT1V/div. VIN VOUT VIN 0.5V/div. IIN VOUT 0.5V/div. IIN IIN 1A/div. VOUT 1V/div. IIN IIN 1A/div. EN EN 2V/div. Time (10µs/div) 3.6Vin, 18Ω EN EN 2V/div. EN Time (10µs/div) Shut Down by EN VIN 1V/div. VOUT 1V/div. IOUT 0.2A/div. EN 2V/div. Time (20µs/div) SC724/SC725 RON@200mA RON@2A Typical Characteristics (SC724), Cont. On Resistance vs. Temperature Iout=200mA Ĺı Ĺı 1.2V ķı Ķı 1.5V 1.8V ĵı 2.5V Ĵı 3.6V ijı 1.2V ķı Ķı 1.8V ĵı 3.6V Ĵı ijı Quiescent Current IJı Shutdown Current IJı Įĵı ijĶ ĹĶ Temperature (°C) Įĵı ŕŦŮűŦųŢŵŶųŦĩɗĪ ijĶ ĹĶ Temperature (°C) ŕŦŮűŦųŢŵŶųŦĩɗĪ Shut Down Current vs. Temperature Quiescent Current vs. Temperature ıįĴij IJįı ıįĺ ıįijĹ 3.6V Shut Down Current (µA) ŔũŶŵťŰŸůġńŶųųŦůŵĩŶłĪ Quiescent Current (µA) ŒŶŪŦŴŤŦůŵġńŶųųŦůŵĩŶłĪ On Resistance vs. Temperature ĸı On Resistance (mΩ) œŰůĩŮȟĪ On Resistance (mΩ) œŰůĩŮȟĪ ĸı Iout=2A ıįĹ ıįĸ ıįķ ıįĶ ıįĵ ıįĴ 1.8V ıįij ıįIJ Turn-on delay time 1.1V ıįijı ıįIJķ 3.6V ıįIJij ıįıĹ 1.8V ıįıĵ 1.1V ıįıı ıįı Įĵı ıįijĵ ijĶ ĹĶ Temperature (°C) Įĵı ijĶ Temperature (°C) ĹĶ ŕŦŮűŦųŢŵŶųŦĩɗĪ ŕŦŮűŦųŢŵŶųŦĩɗĪ Turn-on Delay Time vs. Temperature ŕŶųůĮŐůġŅŦŭŢźġŕŪŮŦĩŶŔĪ Turn-on delay time (µs) ķı Ķı 1.1V ĵı Ĵı ijı 1.8V IJı 3.6V ı Įĵı ijĶ Temperature (°C) ĹĶ ŕŦŮűŦųŢŵŶųŦĩɗĪ SC724/SC725 Typical Characteristics (SC725) 3.6Vin,1.8Ω VIN 1V/div. VOUT 1V/div. IOUT 1A/div. IIN 1A/div. VIN 0.5V/div. Start Up by VIN 3.6Vin,1.8Ω Shut Down by VIN VIN 1V/div. VOUT 1V/div. IOUT 1A/div. IIN 1A/div. Time (5ms/div) Time (5ms/div) 1.8Vin, 0.9Ω Start Up by EN 3.6Vin,1.8Ω Start Up by EN VIN 1V/div. VOUT 0.5V/div. VOUT 1V/div. IOUT 1A/div. EN 2V/div. Time (0.2ms/div) 3.6Vin, 18Ω IOUT 1A/div. EN 2V/div. Shut Down by EN Time (0.1ms/div) EN High Threshold vs. Temperature IJııı VIN 1V/div. EN High Threshold (mV) œŰůĩŮȟĪ ĺĶı VOUT 1V/div. IOUT 0.2A/div. ĺıı 3.6V ĹĶı Ĺıı ĸĶı 1.8V ĸıı ķĶı ķıı 1.1V ĶĶı EN 2V/div. Ķıı Time (5µs/div) Įĵı ijĶ Temperature (°C) ĹĶ ŕŦŮűŦųŢŵŶųŦĩɗĪ SC724/SC725 Typical Characteristics (SC725), Cont. Turn-off Delay vs. Temperature Shut Down Current vs. Temperature ijįĶ IJĹ 3.6V Turn Off Delay (µs) ijįı 3.6V IJįĶ ņŏġőŶŭŭťŰŸůġœŦŴŪŴŵŢůŤŦĩŎȟĪ ŔũŶŵťŰŸůġńŶųųŦůŵĩŶłĪ Shut Down Current (µA) IJķ IJįı 1.8V ıįĶ 1.1V IJĵ IJij IJı Ĺ ķ 1.8V ĵ ij ı ıįı Įĵı ijĶ Įĵı ĹĶ Temperature (°C) Falling Time vs. Temperature Ĺ Ĵıı ĸ Falling Time (µs) ĴĶı ijĶı 1.8V ņŏġőŶŭŭťŰŸůġœŦŴŪŴŵŢůŤŦĩŎȟĪ ņŏġőŶŭŭťŰŸůġœŦŴŪŴŵŢůŤŦĩŎȟĪ Turn On Delay (µs) Turn-on Delay vs. Temperature ijıı IJĶı 3.6V Ķı ı Įĵı ĹĶ ŕŦŮűŦųŢŵŶųŦĩɗĪ ŕŦŮűŦųŢŵŶųŦĩɗĪ IJıı ijĶ Temperature (°C) ijĶ ĹĶ Temperature (°C) ŕŦŮűŦųŢŵŶųŦĩɗĪ 1.8V ķ 3.6V Ķ ĵ Ĵ ij IJ ı Įĵı ijĶ Temperature (°C) ĹĶ ŕŦŮűŦųŢŵŶųŦĩɗĪ Rising Time vs. Temperature ĴĶı ņŏġőŶŭŭťŰŸůġœŦŴŪŴŵŢůŤŦĩŎȟĪ Rising Time (µs) Ĵıı ijĶı 1.8V ijıı IJĶı 3.6V IJıı Ķı ı Įĵı ijĶ ĹĶ Temperature (°C) ŕŦŮűŦųŢŵŶųŦĩɗĪ SC724/SC725 Block Diagram SC724 VOUT VIN (1.1V to 3.6V) C1 Slew Rate Control EN C2 ILoad (Up to 2A) SC724 GND SC725 VOUT VIN (1.1V to 3.6V) C1 Slew Rate Control EN C2 ILoad (Up to 2A) SC725 GND 10 SC724/SC725 Application Information Operation Output Capacitor The SC724/SC725 is an integrated high-side PMOS load switch that is designed to support up to 2A continuous output current and operate from an input voltage from 1.1V to 3.6V. The internal PMOS pass element has a very low ON resistance of 36mΩ (typical) at VIN = 1.8V. The SC724/SC725 also provides ultra-low shutdown and quiescent current for extended battery life during application off and standby states. A 1µF ceramic capacitor is normally used at the VOUT pin to suppress output noise and provide smooth voltage to the load. If a larger output capacitance value is used, the input inrush current should be considered because the power-on transient is also dependent on the output capacitor value. Note that SC725 has longer Turn-on Delay Time and Rising Time than SC724. If a larger output capacitor is used, SC725 could significantly improve input inrush current during power-on process. SC725 provides longer Turn-on Delay Time and Rising Time, which can help reduce inrush current and voltage drop on the input supply rail during power on. SC724 provides shorter Turn-on Delay and Rising Time for applications where immediate response is required. Output Voltage Pull-down The SC725 also includes an automatic output discharge function. It employs a 220Ω (typical) discharge path to ground when the EN pin is disabled. Enable The EN pin controls the ON/OFF states of the load switch. Pulling the EN pin HIGH turns on the load switch. Pulling the EN pin LOW turns off the load switch. The EN pin incorporates a 5.0MΩ (typical) pull-down resistor, so that when the EN pin is floating the SC724/SC275 is disabled. Board Layout Considerations Fig. 1 shows a typical application circuit with PCB inductance on the circuit board. An important objective of the layout is to minimize the PCB inductance by reducing the length and increasing the width of the traces. The input capacitor C1 and output capacitor C2 need to be placed close to the SC724/SC725. To analyze the stray inductance, Fig. 1 shows three current loops during the opening or closing of the load switch. The magnitude of the voltage ringing at VIN or VOUT pin is related to the PCB stray inductance and the placement of the capacitors. It is important to keep the voltage ringing below the maximum voltage rating of the SC724/SC725. LPCB LPCB + - IIN C1 1uF VIN VOUT LPCB LPCB C2 1uF SC724/SC725 IOUT RL GND Input Capacitor ISW In order to reduce the effects of voltage drop, noise, and bounce at the VIN pin, a filter/decoupling capacitor between VIN to GND is recommended. A 1µF ceramic capacitor is sufficient for most application conditions. However, it should be noted that suppressing bounce at input loop after EN is changed from HIGH to LOW can require greater capacitor values depending on particular designs. During certain shutdown conditions, as in the case when input power supply is abruptly removed, the input voltage may tend to drop faster than the output voltage. In this event a reverse current, through the body diode of internal PMOS FET, from VOUT to VIN can occur. To limit this reverse current, the Cin value should be selected greater than the Cout value. LPCB Figure 1 - PCB Circuit with Equivalent Parasitic Inductance Evaluation Board Information The Top Layer and Bottom Layer of a standard evaluation board are shown in Fig. 2 and Fig. 3, respectively. Both T1 and T2 test points are Kelvin connections which can be used to minimize the measurement error of RON. To enable the part, a jumper can be used between VIN and EN on J1. To disable the part, a jumper can be connected between EN and GND on J1. 11 SC724/SC725 Top Layer DBN461!W!21/6!;!Xfe!Kbo!26!27;69;44!3125!.!)Voujumfe* Figure 2 Bottom Layer DBN461!W!21/6!;!Uiv!Kbo!27!21;68;69!3125!.!)Voujumfe* Figure 3 12 SC724/SC725 Outline Drawing — CSP 0.76mm X 0.76mm, 4 Lead 13 SC724/SC725 Land Pattern — CSP 0.76mm X 0.76mm, 4 Lead 14 SC724/SC725 © Semtech 2014 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 specified maximum ratings or operation outside the specified range. SEMTECH PRODUCTS ARE NOT DESIGNED, INTENDED, AUTHORIZED OR WARRANTED TO BE SUITABLE FOR USE IN LIFESUPPORT APPLICATIONS, DEVICES OR SYSTEMS OR OTHER CRITICAL APPLICATIONS. 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