SC33021 2A Load Switch with Reverse Current Blocking POWER MANAGEMENT Features Description Input Voltage Range – 1.6V to 5.5V 2A Continuous Output Current Ultra Low Ron – 32mΩ Reverse Current Blocking Automatic Output Discharge Low Quiescent Current – 0.8µA Low Shutdown Current – 0.3µA Internal Soft Start Hardened ESD Protection 5kV Package: CSP – 0.9mm x 0.9mm 4–Bump The SC33021 is an integrated 2A Load Switch with reverse current blocking. It operates from a 1.6V to 5.5V input supply. The SC33021 includes an automatic output discharge. The device provides extremely low 32mΩ ON resistance (RON) in an ultra-small package. The reverse blocking feature prevents current from flowing in reverse direction from the output through the device to the input supply rail. Whenever VOUT to VIN voltage exceeds the reverse blocking threshold, reverse blocking is activated regardless of the IC enable state (either ON or OFF). The SC33021 is offered in a tiny 0.9mm x 0.9mm x 0.6mm, 4 Bump CSP package. Applications Wearable Electronics Tablet PCs, eReaders Smartphones SUPPLY Notebook PCs, Ultrabooks Battery Powered Equipment 1µF Other Portable Devices VIN 0.1µF SC33021 EN ENABLE LOAD VOUT GND Typical Application Circuit LOAD SUPPLY 1µF 1µF SC33021 GND Rev. 2.1 VIN VOUT EN © 2015 Semtech Corporation ENABLE SC33021 Pin Configuration Ordering Information TOP VIEW VIEW (BUMPS TOP ON THE BOTTOM) (BUMPS ON THE BOTTOM) A1 A2 B1 B2 Device Package SC33021CSTRT CSP 0.9mm x 0.9mm 4-bump SC33021CSEVB Evaluation Board Notes: (1) Available in tape and reel only. A reel contains 5,000 devices. (2) Lead-free package only. Device is WEEE and RoHS compliant, and halogen free. CSP 0.9mm x 0.9mm, 4 Bump Marking Information Marking for the 0.9mm x 0.9 mm CSP 4 Lead Package : O = Pin 1 ID nn = Part No. Code (Example: HC) - Reference Part No. SC33021 Absolute Maximum Ratings Recommended Operating Conditions VVIN to GND (V). . . . . . . . . . . . . . . . . . . . . . . . . . . . . -0.3 to +6.0 Maxiumum Output Current (A) . . . . . . . . . . . . . . . . . . . . . . . . 2 VEN to GND (V) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -0.3 to +6.0 VVIN (V). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1.6 to 5.5 VVOUT to GND (V). . . . . . . .. . . . . . . . . . . . . . . . . -0.3 to (VVIN + 0.3) ESD Protection Level HBM (1) (kV). . . . . . . . . . . . . . . . . . . . . . . 5 Thermal Information Thermal Resistance, Junction to Ambient(2)(°C/W) . . . 140 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 < +85°C for min and max, VVIN = 2.8V, CVIN = 1μF, CVOUT = 1μF, VEN = VVIN. Parameter Under Voltage Lockout Ron Shutdown Current Quiescent Current(1) Symbol VUVLO RON ISD IQ Conditions Min Typ VVIN increasing, VEN=2V, IVOUT=100mA VVIN decreasing, VEN=2V, RL=10Ω Max Units 1.2 V 0.5 V VVIN =5.5V, IVOUT = 200mA, VEN =1.5V 25 41 VVIN =4.3V, IVOUT = 200mA, VEN =1.5V 28 46 VVIN =3.3V, IVOUT = 200mA, VEN =1.5V 32 53 VVIN =2.5V, IVOUT = 200mA, VEN =1.5V 40 64 VVIN =1.6V, IVOUT = 200mA, VEN =1.5V 65 100 VVIN =5.5V��� , VEN=0V, VVOUT = open 0.7 11 VVIN =3.3V��� , VEN=0V, VVOUT = open 0.4 11 VVIN =2.8V��� , VEN=0V, VVOUT = open 0.3 10 VVIN =1.6V��� , VEN=0V, VVOUT = open 0.1 5 VVIN=VEN=5.5V, VVOUT = open 1.6 7 VVIN=VEN=3.3V, VVOUT = open 0.9 3 VVIN=VEN=2.8V, VVOUT = open 0.8 3 VVIN=VEN=1.6V, VVOUT = open 0.4 1.2 mΩ μA µA SC33021 Electrical Characteristics (continued) Parameter Symbol Leakage Current ILK Conditions Min Typ Max Units VVOUT =0V, VVIN=5.5V, VEN=0V 1 11 µA VVOUT =0V, VVIN=3.6V, VEN=0V 0.3 4.5 µA VVOUT =0V, VVIN=1.6V, VEN=0V 0.1 3 µA VIN = 5.5V, TA = 25°C Turn-on Delay Time TONDT VEN=1.5V, RL=27.5Ω, CVOUT=1μF 275 Turn-off Delay Time TOFFDT VEN=1.5V, RL=27.5Ω, CVOUT=1μF 9 TRT VEN=1.5V, RL=27.5Ω, CVOUT=1μF 502 Turn-on Delay Time TONDT VEN=1.5V, RL=18Ω, CVOUT=1μF 440 Turn-off Delay Time TOFFDT VEN=1.5V, RL=18Ω, CVOUT=1μF 10 TRT VEN=1.5V, RL=18Ω, CVOUT=1μF 640 Turn-on Delay Time TONDT VEN=1.5V, RL=8Ω, CVOUT=1μF 1221 Turn-off Delay Time TOFFDT VEN=1.5V, RL=8Ω, CVOUT=1μF 27 TRT VEN=1.5V, RL=8Ω, CVOUT=1μF 1492 Reverse Blocking Current IRCENL VEN=0V, VVIN=0V, VVOUT=5.5V 3 Reverse Blocking Threshold VRBT VVOUT=2.8V, VVOUT − VVIN 40 mV Reverse Blocking Hysteresis VRBH VVOUT=2.8V 18 mV Reverse Current Response Delay TRCRD VVIN=5V 41 µs Rising Time μs VIN = 3.6V, TA = 25°C Rising Time μs VIN = 1.6V, TA = 25°C Rising Time μs Reverse Blocking 13 µA EN Digital Input EN Input High Threshold VEN-IH EN Input Low Threshold VEN-IL EN Input Pull-Down Resistance 1.0 V 0.4 V REN 7 MΩ RPD 95 Ω Output Discharge Output Pull-Down Resistance NOTES: (1) IQ current includes EN pull-down current. SC33021 Pin Descriptions SC33021 Pin# Pin Name A1 VOUT Output voltage. B1 GND Ground. A2 VIN Input supply voltage. B2 EN Enable input. A 7MΩ 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. Pin Function Timing Diagram TONDT TOFFDT VEN VVOUT 90% 10% TRT Falling Time Start Up Time ShutDownbyVIN SC33021 Typical Characteristics (SC33021) Testingcondition:VIN=5.5V, Testingcondition:VIN=5.5V, Rout=2.75ɏ,C2=1uF,25ɗ Shut Down by VIN Start Up by VIN Rout=2.75ɏ,C2=1uF,25ɗ VVIN=5.5V, RL=2.75 Ω VVIN=5.5V, RL=2.75 Ω VVIN 1V/div. T1(Vin) T2(Vout) VVOUT 1V/div. StartUpbyEN VVIN 1V/div. VVOUT 1V/div. IVOUT 1A/div. Iout StartUpbyEN Testingcondition:VIN=1.6V,25Ԩ, Rout=8ɏ,C1=C2=1uF,EVB#2 Time (5ms/div) VVIN=1.6V, RL=8 Ω VVIN=3.6V, RL=18 Ω Vin Vout VVIN 1V/div. Iout StartUpbyEN EN Time (0.5ms/div) Turnondelaytime Testingcondition:VIN=5.5V,25Ԩ, Start Up by EN VRout=27.5ɏ,C1=C2=1uF,EVB#2 =5.5V, R =27.5 Ω VIN VVOUT 1V/div. IVOUT 0.2A/div. VEN 1.5V/div. Iout ShutDownbyEN EN Turnondelaytime Time (0.2ms/div) Testingcondition:VIN=1.6V,25Ԩ, Shut Down by EN Rout=8ɏ,C1=C2=1uF,EVB#2 VVIN=1.6V, RL=8 Ω L VVIN 1V/div. Vin Vout VVOUT 1V/div. IVOUT 0.2A/div. VEN 1.5V/div. Testingcondition:VIN=3.6V,25Ԩ, Start Up by EN Rout=18ɏ,C1=C2=1uF,EVB#2 Vin Vout VVOUT 0.5V/div. IVOUT 0.2A/div. T1(Vin) T2(Vout) Iout Time (5ms/div) Start Up by EN VVIN 0.5V/div. VEN 1.5V/div. IVOUT 1A/div. Iout EN Time (0.2ms/div) VVIN 0.5V/div. VVOUT 0.5V/div. IVOUT 0.2A/div. Vin Vout Iout VEN 1.5V/div. Time (10μs/div) Turnoffdelaytime EN ShutDownbyENSC33021 ShutDownbyEN Typical Characteristics (SC33021) Testingcondition:VIN=3.6V,25Ԩ, Testingcondition:VIN=5.5V,25Ԩ, Shut Down by EN Rout=27.5ɏ,C1=C2=1uF,EVB#2 Shut Down by EN Rout=18ɏ,C1=C2=1uF,EVB#2 VVIN=3.6V, RL=18 Ω VVIN=5.5V, RL=27.5 Ω VVIN 1V/div. VVOUT 1V/div. VVIN 1V/div. VVOUT 1V/div. Vin Vin IVOUT 0.2A/div. IVOUT 0.2A/div. Vout Iout Vout Iout VEN 1.5V/div. Turnoffdelaytime Time (10μs/div) EN VEN 1.5V/div. Reverse Blocking Threshold VVOUT=2.8V VVOUT=2.8V EN Turnoffdelaytime Time (10μs/div) Reverse Blocking Hystersis VVOUT-VVIN 100mV/div. VVOUT-VVIN 100mV/div. IVOUT 2A/div. IVOUT 0.5A/div. Time (10ms/div) Time (2ms/div) Reverse Current Response Delay Time (10ms/div) VVIN=5V VVOUT-VVIN 100mV/div. IVOUT 5A/div. Time (20μs/div) SC33021 RON@2A RON@200mA Typical Characteristics, Cont. On Resistance vs. Temperature IVOUT = 200mA Ĺı 1.6V OnœŰůĩŮȟĪ Resistance (mΩ) ķı Ķı 2.5V ĵı 3.3V 4.3V 1.6V Ĺı ĸı ķı 2.5V Ķı ĵı 3.3V 4.3V Ĵı 5.5V Ĵı 5.5V ijı ijı Quiescent Current IJı Įĵı Shutdown Current IJı ijĶ ĹĶ Temperature (°C) Įĵı ijĶ ŕŦŮűŦųŢŵŶųŦĩɗĪ Shut Down Current vs. Temperature Quiescent Current vs. Temperature ĵįı Ĵįı ĴįĶ ŔũŶŵťŰŸůġńŶųųŦůŵĩŶłĪ Shutdown Current (µA) ĴįĶ 5.5V ijįĶ ijįı IJįĶ 3.3V 2.8V IJįı ıįĶ 1.6V ıįı Įĵı ĹĶ Temperature (°C) ŕŦŮűŦųŢŵŶųŦĩɗĪ Quiescent Current (µA) ŒŶŪŦŴŤŦůŵġńŶųųŦůŵĩŶłĪ On Resistance vs. Temperature ĺı ĸı On œŰůĩŮȟĪ Resistance (mΩ) IVOUT = 2A IJıı EN HIGHThreshold ijĶ Temperature (°C) 5.5V Ĵįı ijįĶ ijįı IJįĶ IJįı 3.3V 2.8V ıįĶ EN_PULLDOWN_R ıįı ĹĶ Įĵı 1.6V ijĶ Temperature (°C) ŕŦŮűŦųŢŵŶųŦĩɗĪ ĹĶ ŕŦŮűŦųŢŵŶųŦĩɗĪ EN Pull-Down Resistance vs. Temperature EN HIGH Threshold vs. Temperature ĸįĵ ĺĶı 2.8V ĹĶı EN Pull-Down Resistance (MΩ) ņŏġőŶŭŭťŰŸůġœŦŴŪŴŵŢůŤŦĩŎȟĪ ņŏĩŮŗĪ (mV) EN High Threshold ĺıı 5.5V Ĺıı 3.6V 2.8V ĸĶı ĸıı 1.6V ķĶı ĸįij ĸįı ķįĹ ķįķ ķįĵ ķįij ķįı ĶįĹ ķıı Įĵı ijĶ Temperature (°C) ŕŦŮűŦųŢŵŶųŦĩɗĪ ĹĶ Įĵı ijĶ ĹĶ Temperature (°C) ŕŦŮűŦųŢŵŶųŦĩɗĪ SC33021 ON_DELAY T_RISE_3P6V Typical Characteristics, Cont. Rising Time vs. Temperature Turn-on Delay Time vs. Temperature IJĹıı IJķıı IJĵıı 1.6V IJijıı IJııı Ĺıı ķıı 3.6V ĵıı 5.5V ijıı Įĵı IJııı Ĺıı 3.6V ķıı 5.5V ĵıı ijıı TURN_OFF_3P6V ı 1.6V IJijıı ŕŶųůĮŐŧŧġŅŦŭŢźġŕŪŮŦĩŶŔĪ ŕŶųůĮŐůġŅŦŭŢźġŕŪŮŦĩŶŔĪ IJĵıı Turn-On Rising Time (µs) Turn-On Delay Time (µs) IJķıı ijĶ RBC_5.5V ı ĹĶ Įĵı Temperature (°C) ijĶ Temperature (°C) ŕŦŮűŦųŢŵŶųŦĩɗĪ ŕŦŮűŦųŢŵŶųŦĩɗĪ Reverse Blocking Current vs. Temperature Turn-off Delay Time vs. Temperature ĴĶ ķ ijĶ œŦŷŦųŴŦġŃŭŰŤŬŪůŨġńŶųųŦůŵĩŶłĪ Turn-Off Time (µs) ŕŶųůĮŐŧŧġŅŦŭŢźġŕŪŮŦĩŶŔĪ Reverse Blocking Current (µA) 1.6V Ĵı ijı IJĶ 3.6V IJı 5.5V Ķ ı Įĵı OUT_LKG ijĶ ĹĶ EN = Low Ķ 5.5V ĵ Ĵ ij IJ ı Temperature (°C) ĹĶ ŕŦŮűŦųŢŵŶųŦĩɗĪ Įĵı ijĶ ĹĶ Temperature (°C) ŕŦŮűŦųŢŵŶųŦĩɗĪ Reverse Blocking Threshold and Hysteresis vs. Temperature ĶĶįı Ůŗ Reverse Blocking (mV) Ķıįı Threshold ĵĶįı ĵıįı ĴĶįı Ĵıįı Hysteresis ijĶįı ijıįı Įĵı ijĶ Temperature (°C) ĹĶ ŕŦŮűŦųŢŵŶųŦĩɗĪ SC33021 SC33021 Block Diagram REVERSE BLOCKING VOUT VIN (1.6V to 5.5V) C1 Slew Rate Control EN C2 ILoad (Up to 2A) SC33021 GND 10 SC33021 Application Information Operation The SC33021 is an integrated high-side PMOS load switch that is designed to support up to 2A continuous output current and operates from an input voltage from 1.6V to 5.5V. The internal PMOS pass element has a very low ON resistance of 32mΩ (typical) at V VIN = 3.3V. The SC33021 also provides ultra-low shutdown and quiescent current for extended battery life during shutdown and standby conditions. An internal soft start circuit is used to control the start-up time of thej load switch to reduce inrush current during start-up. Enable The EN pin controls the ON/OFF state 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 7MΩ (typical) pull-down resistor, so that when the EN pin is floating the SC33021 is disabled. Reverse Blocking The SC33021 integrates a reverse current blocking circuit to prevent current flow from VOUT to VIN during both ON and OFF states. The reverse current blocking circuit is active when voltage is present on either the VIN or the VOUT pins. A comparator is used to sense and compare the VOUT voltage to the VIN voltage. Whenever the VOUT voltage is 40mV (typical at 25°C) higher than VIN, the Reverse Blocking circuit is triggered and reverse current is blocked from VOUT to VIN. Please note that when 0 < VOUT - VIN < 40mV (typical at 25°C), some small reverse current is possible. An example is shown in Fig. 1. Usually, worst case for reverse current occurs at elevated input voltages and reduced temperatures. The following formula can be used to calculate the reverse peak current before the Reverse Blocking circuit is triggered. IRCENH= VRBT RON higher VIN and lower temperature.) IRCENH is the amount of reverse current, VRBT voltage threshold. RON- is Reverse the on-resistance, on There is smaller resistance at larger VVIN and lower ambient temperature VRBT is the reverse voltage threshold. VVOUT VRBT IRCENH VVIN REVERSE CURRENT Figure 1 Output Voltage Pull-down The SC33021 also includes an automatic output discharge function. It employs a 95Ω (typical) discharge path to ground when the EN pin is disabled. Input Capacitor In order to reduce the effect 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 the input loop after EN is changed from HIGH to LOW can require greater capacitor values depending on particular designs. In circuit design, ceramic capacitors should be derated for operating temperature and voltage. For applications up to 3.6V, capacitors should be rated at 6.3V or higher. For applications up to 5.5V, capacitors should be rated at 10V or higher. Output Capacitor A 1µF ceramic capacitor is normally used at the VOUT pin to filter noise. 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. Please use the same derating criteria for the output capacitor selection. IRCENH - Reverse peak current. R ON - On Resistance, (Usually, is smaller resistance at 11 SC33021 Application Information, Cont. Board Layout Considerations Fig. 2 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. PCB inductance can affect circuit performance during turn-off, load transients, and Reverse Blocking. Fig. 2 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. The input capacitor C1 and output capacitor C2 need to be placed close to the SC33021. It is important to keep the voltage ringing below the maximum voltage rating of the SC33021. LPCB LPCB + - IVIN VIN VOUT C1 1uF LPCB LPCB C2 0.1uF SC33021 IVOUT RL GND ISW LPCB Figure 2 - PCB Circuit with Equivalent Parasitic Inductance Evaluation Board Information The Top Layer and Bottom Layer of a standard evaluation board are shown in Fig. 3 and Fig. 4, 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. C3 is an optional solution to improve ringing at input rail during turn-off and reverse blocking conditions. 12 SC33021 DBN461!W!21/6!;!Npo!Opw!35!21;59;66!3125!.!)Voujumfe* Top Layer, SC33021 Figure 3 DBN461!W!21/6!;!Gsj!Opw!32!21;43;48!3125!.!)Voujumfe* Bottom Layer, SC33021 Figure 4 13 SC33021 Outline Drawing — CSP 0.9mm X 0.9mm, 4 Lead 14 SC33021 Land Pattern — CSP 0.9mm X 0.9mm, 4 Lead 15 SC33021 © 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 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. 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