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Technical content

Features

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 Out - put 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

Description

The SC724/SC725 is a low input voltage, very low Ron load switch designed for use in battery powered applica - tions. Very low quiescent current of less than 2 µA, and a low shutdown current of less than 1 µA (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. SC724 / SC725 SUPPLY LOADVOUTVIN EN GNDENABLE VIN 1µF 1µF Typical Application Circuit Rev. 2.0 Device Package Automatic Discharge Rising Time SC724 CSP No 3µs(Typ.) SC725 CSP Yes 140µs(Typ.)

Pin Configuration Ordering Information 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. A 1 A 2 B 1 B 2 T O P V IE W (B U M P S O N T H E B O T T O M) CSP 0.76x0.76, 4 Bump Pin Descriptions Pin # Pin Name Pin Function 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.

Marking Information(SC724) Marking Information(SC725) Marking for the 0.76 x 0.76 mm CSP 4 Lead Package : O = Pin 1 ID nn = Part No. Code (Example: AR) - Reference Part No. Marking for the 0.76 x 0.76 mm CSP 4 Lead Package : O = Pin 1 ID nn = Part No. Code (Example: AT) - Reference Part No.

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. Absolute Maximum Ratings Recommended Operating Conditions Thermal Information Thermal Resistance, Junction to Ambient(2) (°C/W) . . . 160 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 Symbol Conditions Min Typ Max Units On Resistance (Ron) RON VVIN =3.6V, IOUT = 200mA, VVEN =1.5V 24 mΩ VVIN =2.5V, IOUT = 200mA, VVEN =1.5V 29 mΩ VVIN =1.8V, IOUT = 200mA, VVEN =1.5V 36 47 mΩ VVIN =1.5V, IOUT = 200mA, VVEN =1.5V 43 mΩ VVIN =1.2V, IOUT = 200mA, VVEN =1.0V 57 mΩ Quiescent Current (1) IQ VVIN = VEN = 3.6V, VOUT = open 0.81 2 µA Enable EN Input High Threshold VEN-IH 1.1 V EN Input Low Threshold VEN-IL 0.3 V EN Input Pull-Down Resistance REN 5.0 MΩ SC724 Shutdown Current ISD VEN =0V, VOUT = open 1 µA VEN =0V, VOUT = open, TA = 25°C°C 0.2 µA

Electrical Characteristics

Parameter Symbol Conditions Min Typ Max Units Turn-on Delay Time TDT VVIN =1.8V, IOUT = 200mA, VVEN =1.5V, COUT=1µF 11 µs VVIN =3.6V, IOUT = 200mA, VVEN =1.5V, COUT=1µF 2.8 µs Rising Time TRT VVIN =1.8V, IOUT = 200mA, VVEN =1.5V, COUT=1µF 8.5 µs VVIN =3.6V, IOUT = 200mA, VVEN =1.5V, COUT=1µF 3 µs SC725 Shutdown Current ISD VEN =0V, VOUT = open 8 µA VEN =0V, VOUT = open, TA = 25°C°C 0.6 µA Turn-on Delay Time TDT VVIN =1.8V, IOUT = 200mA, VVEN =1.5V, COUT=1µF 240 µs VVIN =3.6V, IOUT = 200mA, VVEN =1.5V, COUT=1µF 110 µs Rising Time TRT VVIN =1.8V, IOUT = 200mA, VVEN =1.5V, COUT=1µF 250 µs VVIN =3.6V, IOUT = 200mA, VVEN =1.5V, COUT=1µF 140 µs Output Pull-Down Resistance RPD VVIN =1.8V 220 Ω Electrical Characteristics (continued) Notes: (1) IQ current includes EN pull-down current. Turn-on Delay Rising Time Turn-off Delay 90% 10% VEN VOUT Falling Time (Turn on time)=(Turn-on Delay)+(Rising Time) Timing Diagram

Time (5ms/div) Start Up by VIN Start Up by EN Start Up by EN 1.8Vin, 0A Typical Characteristics (SC724) VOUT 1V/div. VIN 1V/div. IOUT 1A/div. 3.6Vin,0A Time (10µs/div) Testing condition: VIN=3.6V, Iout=0.5A, C2=1uF, 25Ԩ, VOUT VIN Iin Start up by VIN IOUT 3.6Vin,1.8Ω EN 2V/div. Time (10µs/div) Time (5ms/div) Shut Down by VIN 3.6Vin,1.8Ω StartupbyEN Testingcondition:VIN=1.8V,25Ԩ, Iout=2A,C1=C2=1uF,CRMode Testingcondition:VIN=3.6V,25Ԩ, Iout=2A,C1=C2=1uF,CRMode Testingcondition:VIN=1.8V,25Ԩ, Iout=2A,C1=C2=1uF,CRMode Testingcondition:VIN=3.6V,25Ԩ, Iout=2A,C1=C2=1uF,CRMode VOUT VIN EN IIN VOUT VIN EN IIN VOUT VIN EN IIN VOUT VIN EN IIN StartupbyEN Testingcondition:VIN=1.8V,25Ԩ, Iout=2A,C1=C2=1uF,CRMode Testingcondition:VIN=3.6V,25Ԩ, Iout=2A,C1=C2=1uF,CRMode Testingcondition:VIN=1.8V,25Ԩ, Iout=2A,C1=C2=1uF,CRMode Testingcondition:VIN=3.6V,25Ԩ, Iout=2A,C1=C2=1uF,CRMode VOUT VIN EN IIN VOUT VIN EN IIN VOUT VIN EN IIN VOUT VIN EN IIN VIN 1V/div. IIN 1A/div. VOUT 1V/div. EN 2V/div. Time (20µs/div) Shut Down by EN 3.6Vin, 18Ω IIN 1A/div. Testing condition: VIN=3.6V, Iout=0.5A, C2=1uF, CR mode, 25ɗ T6(Vout) T5(Vin) Iout Shutdown by VIN VOUT VIN Iin IOUT VOUT 1V/div. VIN 1V/div. IOUT 1A/div. IIN 1A/div. VOUT 0.5V/div. VIN 0.5V/div. IIN 1A/div. EN 2V/div. VOUT 1V/div. VIN 1V/div. IOUT 0.2A/div.

Typical Characteristics (SC724), Cont. Quiescent Current ( µA) IJı ijı Ĵı ĵı Ķı ķı ĸı Ĺı Įĵı ijĶ ĹĶ œŰůĩŮȟĪ ŕŦŮűŦųŢŵŶųŦĩɗĪ 1.8V 2.5V 3.6V 1.5V 1.2V RON@200mA On Resistance (mΩ) Temperature (°C) On Resistance vs. Temperature Quiescent Current vs. Temperature Iout=200mA RON@2A IJı ijı Ĵı ĵı Ķı ķı ĸı Ĺı Įĵı ijĶ ĹĶ œŰůĩŮȟĪ ŕŦŮűŦųŢŵŶųŦĩɗĪ 1.8V 3.6V 1.2V On Resistance (mΩ) Temperature (°C) On Resistance vs. Temperature Iout=2A Quiescent Current ıįı ıįIJ ıįij ıįĴ ıįĵ ıįĶ ıįķ ıįĸ ıįĹ ıįĺ IJįı Įĵı ijĶ ĹĶ ŒŶŪŦŴŤŦůŵġńŶųųŦůŵĩŶłĪ ŕŦŮűŦųŢŵŶųŦĩɗĪ 3.6V 1.8V 1.1V Temperature (°C) Turn-on delay time ( µs Turn-on Delay Time vs. Temperature Turn-on delay time ı IJı ijı Ĵı ĵı Ķı ķı Įĵı ijĶ ĹĶ ŕŶųůĮŐůġŅŦŭŢźġŕŪŮŦĩŶŔĪ ŕŦŮűŦųŢŵŶųŦĩɗĪ 3.6V 1.8V 1.1V Temperature (°C) Shut Down Current ( µA) Shut Down Current vs. Temperature Shutdown Current ıįıı ıįıĵ ıįıĹ ıįIJij ıįIJķ ıįijı ıįijĵ ıįijĹ ıįĴij Įĵı ijĶ ĹĶ ŔũŶŵťŰŸůġńŶųųŦůŵĩŶłĪ ŕŦŮűŦųŢŵŶųŦĩɗĪ 3.6V 1.8V 1.1V Temperature (°C)

Time (5ms/div) Start Up by VIN Start Up by EN Start Up by EN 1.8Vin, 0.9Ω Typical Characteristics (SC725) VOUT 1V/div. VIN 1V/div. IOUT 1A/div. 3.6Vin,1.8Ω Time (0.2ms/div) 3.6Vin,1.8Ω EN 2V/div. Time (0.1ms/div) Time (5ms/div) Shut Down by VIN 3.6Vin,1.8Ω VIN 1V/div. IOUT 1A/div. VOUT 1V/div. EN 2V/div. Time (5µs/div) Shut Down by EN 3.6Vin, 18Ω VOUT 1V/div. VIN 1V/div. VOUT 0.5V/div. VIN 0.5V/div. IOUT 1A/div. IOUT 0.2A/div. VOUT 1V/div. VIN 1V/div. EN 2V/div. IIN 1A/div. IOUT 1A/div. IIN 1A/div. Ķıı ĶĶı ķıı ķĶı ĸıı ĸĶı Ĺıı ĹĶı ĺıı ĺĶı IJııı Įĵı ijĶ ĹĶ œŰůĩŮȟĪ ŕŦŮűŦųŢŵŶųŦĩɗĪ 3.6V 1.8V 1.1VEN High Threshold (mV) Temperature (°C) EN High Threshold vs. Temperature

Typical Characteristics (SC725), Cont. Turn On Delay ( µs ıįı ıįĶ IJįı IJįĶ ijįı ijįĶ Įĵı ijĶ ĹĶ ŔũŶŵťŰŸůġńŶųųŦůŵĩŶłĪ ŕŦŮűŦųŢŵŶųŦĩɗĪ 3.6V 1.8V 1.1V Shut Down Current ( µA) Temperature (°C) Shut Down Current vs. Temperature Turn-on Delay vs. Temperature Turn Off Delay ( µs Turn-off Delay vs. Temperature ı Ķı IJıı IJĶı ijıı ijĶı Ĵıı ĴĶı Įĵı ijĶ ĹĶ ņŏġőŶŭŭťŰŸůġœŦŴŪŴŵŢůŤŦĩŎȟĪ ŕŦŮűŦųŢŵŶųŦĩɗĪ 1.8V 3.6V Temperature (°C) ı ij ĵ ķ Ĺ IJı IJij IJĵ IJķ IJĹ Įĵı ijĶ ĹĶ ņŏġőŶŭŭťŰŸůġœŦŴŪŴŵŢůŤŦĩŎȟĪ ŕŦŮűŦųŢŵŶųŦĩɗĪ 1.8V 3.6V Temperature (°C) Rising Time ( µs Rising Time vs. Temperature Falling Time ( µs Falling Time vs. Temperature ı Ķı IJıı IJĶı ijıı ijĶı Ĵıı ĴĶı Įĵı ijĶ ĹĶ ņŏġőŶŭŭťŰŸůġœŦŴŪŴŵŢůŤŦĩŎȟĪ ŕŦŮűŦųŢŵŶųŦĩɗĪ 1.8V 3.6V Temperature (°C) ı IJ ij Ĵ ĵ Ķ ķ ĸ Ĺ Įĵı ijĶ ĹĶ ņŏġőŶŭŭťŰŸůġœŦŴŪŴŵŢůŤŦĩŎȟĪ ŕŦŮűŦųŢŵŶųŦĩɗĪ 1.8V 3.6V Temperature (°C)

VIN (1.1V to 3.6V) VOUT EN GND SC724 ILoad (Up to 2A) Slew Rate Control VIN (1.1V to 3.6V) VOUT EN GND C2Slew Rate Control SC725 ILoad (Up to 2A) SC724 SC725

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. Board Layout Considerations Fig. 1 shows a typical application circuit with PCB induc - tance 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.

Application Information

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 V IN = 1.8V. The SC724/SC725 also provides ultra-low shutdown and qui - escent current for extended battery life during applica - tion off and standby states. 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. Input Capacitor 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. C1 C2 LPCB VIN VOUT LPCB GND LPCB LPCB ISW 1uF IOUT RL1uF LPCB IIN SC724/SC725 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 R ON. To enable the part, a jumper can be used between VIN and EN on J1. To disable the part, a jumper can be con - nected between EN and GND on J1.

Outline Drawing — CSP 0.76mm X 0.76mm, 4 Lead

Land Pattern — CSP 0.76mm X 0.76mm, 4 Lead

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Phone: (805) 498-2111 Fax: (805) 498-3804 www.semtech.com Contact Information 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 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 specified maximum ratings or operation outside the specified 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 CUSTOMER’S OWN RISK. Should a customer purchase or use Semtech products for any such unauthorized application, the customer shall indemnify and hold Semtech and its officers, employees, subsidiaries, affiliates, 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.