MP5073 5.5V, 2A Low RDSON Load Switch With Programmable Current Limit DESCRIPTION The MP5073 provides up to 2A load protection over a 0.5V to 5.5V voltage range. With the small RDSON in tiny package, MP5073 is a very high efficiency and space saving solution for notebooks, tablets, and other portable/batteryoperated applications. With the soft start function, the MP5073 can avoid inrush current during circuit start up. MP5073 also provides programmable soft start time, output discharge functions, OCP and thermal shutdown features. The max load at the output (source) is current limited. This is accomplished by utilizing a sense FET topology. The magnitude of the current limit is controlled by an external resistor from the ILIM pin to ground. An internal charge pump drives the gate of the power device, allowing a very low on-resistance DMOS power FET of just 50mΩ. The MP5073 is available in a tiny 12-pin 2mmx2mm QFN package. FEATURES Integrated 50mΩ Low RDSON FETs Adjustable Start Up Slew Rate Wide VIN Range from 0.5V to 5.5V <1µA Shutdown Current Typical 2A Current Limit Range Power Good Indicator Output Discharge function Enable Pin <200ns Short-Circuit Protection Response Time Thermal Protection Small QFN-12 (2mmx2mm) Package for Space Saving APPLICATIONS Notebook and Tablet Computers Portable Devices Solid State Drives Handheld Devices All MPS parts are lead-free and adhere to the RoHS directive. For MPS green status, please visit MPS website under Quality Assurance. “MPS” and “The Future of Analog IC Technology” are Registered Trademarks of Monolithic Power Systems, Inc. TYPICAL APPLICATION MP5073 Rev. 1.2 7/12/2017 www.MonolithicPower.com MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited. © 2017 MPS. All Rights Reserved. 1 MP5073 – 5.5V, 2A LOW RDSON LOAD SWITCH WITH PROGRAMMABLE CURRENT LIMIT ORDERING INFORMATION Part Number* MP5073GG Package QFN-12 (2mmx2mm) Top Marking See Blow * For Tape & Reel, add suffix –Z (e.g. MP5073GG–Z); TOP MARKING CB: product code of MP5073GG; Y: year code; LLL: lot number; PACKAGE REFERENCE TOP VIEW QFN-12 (2mmx2mm) MP5073 Rev. 1.2 7/12/2017 www.MonolithicPower.com MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited. © 2017 MPS. All Rights Reserved. 2 MP5073 – 5.5V, 2A LOW RDSON LOAD SWITCH WITH PROGRAMMABLE CURRENT LIMIT ABSOLUTE MAXIMUM RATINGS (1) VIN .............................................. –0.3V to +6.5V VCC ............................................. –0.3V to +6.5V VOUT ........................................... –0.3V to +6.5V EN, SS, ILIM ........................–0.3V to Vcc+0.3 V Junction Temperature .............................. 150°C Lead Temperature ................................... 260°C Continuous Power Dissipation(2) QFN-12 (2mmx2mm) .................................1.6W Recommended Operating Conditions (3) Supply Voltage VIN ......................... 0.5V to 5.5V Supply Voltage Vcc ............................ 3V to 5.5V Output Voltage VOUT....................... 0.5V to 5.5V Operating Junction Temp. ........ -40°C to +125°C MP5073 Rev. 1.2 7/12/2017 Thermal Resistance (4) θJA QFN-12 (2mmx2mm) ……....…80 θJC 16 °C/W Notes: 1) Exceeding these ratings may damage the device. 2) The maximum allowable power dissipation is a function of the maximum junction temperature TJ (MAX), the junction-toambient thermal resistance θJA, and the ambient temperature TA. The maximum allowable continuous power dissipation at any ambient temperature is calculated by PD (MAX) = (TJ (MAX)-TA)/θJA. Exceeding the maximum allowable power dissipation will cause excessive die temperature, and the regulator will go into thermal shutdown. Internal thermal shutdown circuitry protects the device from permanent damage. 3) The device is not guaranteed to function outside of its operating conditions. 4) Measured on JESD51-7, 4-layer PCB. www.MonolithicPower.com MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited. © 2017 MPS. All Rights Reserved. 3 MP5073 – 5.5V, 2A LOW RDSON LOAD SWITCH WITH PROGRAMMABLE CURRENT LIMIT ELECTRICAL CHARACTERISTICS VIN = 3.6V, VCC = 3.6V, TA = 25°C, unless otherwise noted. Parameters Input and Supply Voltage Range Input Voltage Supply Voltage Supply Current Off State Leakage Current VCC Standby Current Symbol Condition VIN VCC IOFF ISTBY Min Typ 0.5 3 VIN=5V, EN=0 Max Units 5.5 5.5 V V 1 µA 1 230 µA VCC=5V, EN=0 VCC=5V, Enable, No load 0.1 180 VCC=5.0V VCC=3.3V 50 60 mΩ 150 30 °C °C Power FET ON Resistance RDSON-7 Thermal Shutdown and Recovery Shutdown Temperature (5) Hysteresis (5) Under Voltage Protection VCC Under Voltage Lockout Threshold UVLO Hysteresis Soft Start SS pull-up current Enable EN Rising Threshold EN Hysteresis ILIM TSTD THYS VCC_UVLO ISS Fixed slew rate VENH VENL IOUT Discharge Resistance Discharge Resistance PG RDIS Power Good Hysteresis Power Good Delay Power Good High Power Good Low 2.6 VUVLOHYS Current limit Power Good Rising Threshold UVLO Rising Threshold VPG_R VPG_VHYS TPG_D VPG_H VPG_L RLIMIT=23.8kΩ.Ramp lOUT record peak current limit value 2.8 200 mV 11 µA 1.3 1.5 200 1.7 V mV 1.3 1.4 1.5 A Ω 200 Voltage gap between VOUT and VIN 140 280 450 mV 0.3 mV µs V V 60 50 VCC=3.3V Sink 1mA V 3.2 Notes: 5) Guarantee by Characterization-Not Production tested. MP5073 Rev. 1.2 7/12/2017 www.MonolithicPower.com MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited. © 2017 MPS. All Rights Reserved. 4 MP5073 – 5.5V, 2A LOW RDSON LOAD SWITCH WITH PROGRAMMABLE CURRENT LIMIT PIN FUNCTIONS QFN12(2x2) Pin # 1 2 3 4 5 Name Description EN Enable Input. Pulling this pin below the specified threshold shuts the chip down. GND Ground. VCC Supply Voltage to the Control Circuitry. Output Current Limit Configure. Place a resistor to ground to set the overload current limit ILIM level. Soft start pin. An external capacitor connected to this pin sets the slew rate of the output SS voltage soft start period. 6, 11, VIN Input Power Supply. Exposed Pad 9 VOUT Output to the load. 12 PG 7, 8, 10 NC MP5073 Rev. 1.2 7/12/2017 Power Good Pin. Push-Pull output. NC Pin, Suggest connecting them with VOUT to improve the thermal performance and be compatible with MP5087 and MP5077. www.MonolithicPower.com MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited. © 2017 MPS. All Rights Reserved. 5 MP5073 – 5.5V, 2A LOW RDSON LOAD SWITCH WITH PROGRAMMABLE CURRENT LIMIT TYPICAL PERFORMANCE CHARACTERISTICS VIN = 3.6V, VCC = 3.6V, EN = 2.5V, RLIMIT = 13k, TA = 25°C, unless otherwise noted. MP5073 Rev. 1.2 7/12/2017 www.MonolithicPower.com MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited. © 2017 MPS. All Rights Reserved. 6 MP5073 – 5.5V, 2A LOW RDSON LOAD SWITCH WITH PROGRAMMABLE CURRENT LIMIT TYPICAL PERFORMANCE CHARACTERISTICS (continued) VIN = 3.6V, VCC = 3.6V, EN=2.5V, RLIMIT=13k, TA = 25°C, unless otherwise noted. MP5073 Rev. 1.2 7/12/2017 www.MonolithicPower.com MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited. © 2017 MPS. All Rights Reserved. 7 MP5073 – 5.5V, 2A LOW RDSON LOAD SWITCH WITH PROGRAMMABLE CURRENT LIMIT TYPICAL PERFORMANCE CHARACTERISTICS (continued) VIN = 3.6V, VCC = 3.6V, EN=4V, RLIMIT=13k, TA = 25°C, unless otherwise noted. MP5073 Rev. 1.2 7/12/2017 www.MonolithicPower.com MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited. © 2017 MPS. All Rights Reserved. 8 MP5073 – 5.5V, 2A LOW RDSON LOAD SWITCH WITH PROGRAMMABLE CURRENT LIMIT TYPICAL PERFORMANCE CHARACTERISTICS (continued) VIN = 5V, VCC = 3.6V, EN=4V, RLIMIT=13k, TA = 25°C, unless otherwise noted. MP5073 Rev. 1.2 7/12/2017 www.MonolithicPower.com MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited. © 2017 MPS. All Rights Reserved. 9 MP5073 – 5.5V, 2A LOW RDSON LOAD SWITCH WITH PROGRAMMABLE CURRENT LIMIT VIN Change Pump Current Sense VCC 4μA ILIM VOUT Fast Off Comp Soft Start 11μA 1V Current Limit Amp SS UVLO VCC Control Logic 4μA 8μA Thermal Sense EN 80k VOUT VIN GND VCC PG Figure 1: Functional Block Diagram MP5073 Rev. 1.2 7/12/2017 www.MonolithicPower.com MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited. © 2017 MPS. All Rights Reserved. 10 MP5073 – 5.5V, 2A LOW RDSON LOAD SWITCH WITH PROGRAMMABLE CURRENT LIMIT OPERATION The MP5073 is designed to limit the in-rush current to the load when a circuit card is inserted into a live backplane power source, thereby limiting the backplane’s voltage drop and the slew rate of the voltage to the load. It provides an integrated solution to monitor the input voltage, output voltage and output current to eliminate the need for an external current power MOSFET, and current switch device. Enable When input voltage is greater than the undervoltage lockout threshold (UVLO), typically 0.5V, MP5073 can be enabled by pulling EN pin to higher than 1.5V. Pulling down to ground will disable MP5073. Current Limit The MP5073 provides a constant current limit that can be programmed by an external resistor. Once the device reaches its current limit threshold, the internal circuit regulates the gate voltage to hold the current in the power FET constant. The typical response time is about 20µs and the output current may have a small overshoot during this time period. The pre-set current limit value calculated by below equation: ILIMIT= (1÷RLIMIT ) × S can be (1) S is the current sense ratio of MP5073, and this value is typically 33000 in VIN=Vcc=3.6V. The S is almost a constant value when Vin is changing from 1.2V to 5.5V, and when Vin is smaller than 1.2V, a step change will come to S value, the value will change from 33000 to about 28000. Meanwhile, when Vcc is changing, there is also a little shift on S value, for more information, please refer the curves in typical performance characteristics. If the current limit block starts to regulate the output current, the power loss on power MOSFET will cause the IC temperature rise. If the junction temperature rose to high enough, it will trigger thermal shutdown. After thermal shutdown happened, it will disable the output until the over temperature fault remove. The over temperature threshold is 150 ℃ hysteresis is 30℃. Power-Good Function The PG pin is the push pull of a MOSFET that can be pulled high to VCC. The MOSFET turns on with the application of an input voltage so that the PG pin is pulled to GND. After the voltage gap between VIN and VOUT is smaller than 280mV, the PG pin is pulled high after a 50μs delay. When the voltage gap is higher than 340mV, the PG pin will be pulled low. Short-Circuit Protection If the load current increases rapidly due to a short circuit, the current may exceed the current limit threshold by a lot before the control loop can respond. If the current reaches an internal secondary current limit level (typical 7A), a fast turn-off circuit activates to turn off the power FET. This limits the peak current through the switch to limit the input voltage drop. The total short circuit response time is about 200ns. If fast off works, it will keep off the power FET for 80μs. After that time period, it will re-turn on power FET, if the part is still in short-circuit condition. MP5073 will reduce the current limit, and hold it until the part is so hot and thermal shutdown. After the short-circuit condition removed, the current limit will recover to the pre-set value automatically. Output Discharge MP5073 has output discharge function. This function can discharge the VOUT by internal pull down resistance when IC disabled and the load is very light. Soft-Start A capacitor connected to the SS pin determines the soft-start time. There is an internal 11µA constant current source charge SS cap and ramps up the voltage on the SS pin. The output voltage rises at 5 times the slew rate to SS voltage. The soft-start time can be calculated by below equation: TSS (ms) MP5073 Rev. 1.2 7/12/2017 and 1 VOUT (V) CSS (nF) 5 ISS (A) www.MonolithicPower.com MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited. © 2017 MPS. All Rights Reserved. (2) 11 MP5073 – 5.5V, 2A LOW RDSON LOAD SWITCH WITH PROGRAMMABLE CURRENT LIMIT TSS is the soft-start time, ISS is internal 11µA constant current, CSS is external soft-start cap. The suggestion minimum SS cap should be bigger than 4.7nF. If the SS pin is floated or SS cap is too small, the VOUT rising time will be just limited by power MOS charge time. MP5073 Rev. 1.2 7/12/2017 www.MonolithicPower.com MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited. © 2017 MPS. All Rights Reserved. 12 MP5073 – 5.5V, 2A LOW RDSON LOAD SWITCH WITH PROGRAMMABLE CURRENT LIMIT APPLICATION INFORMATION ILIM Resistor Selection The current limit value can be set by ILIM resistor. The current limit can be gotten by equation (1). Soft Start @ Different Output Capacitance VOUT Current Limit The current limit threshold is suggested to 10% ~ 20% higher than maximum load current. For example, if the system’s full load is 2A, set the current limit to 2.2A. IIN Soft Start @ Small Capacitance Soft Start Capacitor Selection There is an internal 11µA constant current source charge SS cap and ramps up the voltage on the SS pin. The output voltage rises follow the 5 times the slew rate of SS voltage. VOUT Current Limit IIN If the inrush on output current reached the current limit during start up (like with large output cap or very large load), MP5073 will limit the output current and the same time, SS time will be increased (Figure 2 and Figure 3). Soft Start @ Large Capacitance VOUT Current Limit Soft Start @ Different Load IIN Soft Start @ Very large Capacitance VOUT Current Limit Figure 3: Soft Start Periods at Different Output Capacitance IIN DESIGN EXAMPLE Some design example and are provided below Soft Start @ No Load Table 1 VOUT Current Limit IIN Soft Start @ Half Load VIN (V) 3.6 Current limit (A) 0.5 Rlimit (kΩ) 47 SS cap SS time (nF) (ms) 22 1 3.6 1 27.4 47 2.4 3.6 2 15 100 5.4 VOUT Current Limit IIN Soft Start @ Very large Load Figure 2: Soft Start Periods at Different Load MP5073 Rev. 1.2 7/12/2017 www.MonolithicPower.com MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited. © 2017 MPS. All Rights Reserved. 13 MP5073 – 5.5V, 2A LOW RDSON LOAD SWITCH WITH PROGRAMMABLE CURRENT LIMIT Layout Guide PCB layout is very important to achieve stable operation. Please follow these guidelines and take below figure for reference. Place Rlimit close to ILIM pin, input cap close to VCC pin. Put enough vias around IC to achieve better thermal performance. GND C1 Vin GND PG C3 C5 EN VCC Vout Vin GND ILIM R1 C4 C6 GND Vin C2 GND Figure 4: Recommended Layout MP5073 Rev. 1.2 7/12/2017 www.MonolithicPower.com MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited. © 2017 MPS. All Rights Reserved. 14 MP5073 – 5.5V, 2A LOW RDSON LOAD SWITCH WITH PROGRAMMABLE CURRENT LIMIT TYPICAL APPLICATION CIRCUITS MP5073 Rev. 1.2 7/12/2017 www.MonolithicPower.com MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited. © 2017 MPS. All Rights Reserved. 15 MP5073 – 5.5V, 2A LOW RDSON LOAD SWITCH WITH PROGRAMMABLE CURRENT LIMIT PACKAGE OUTLINE DRAWING FOR 12L QFN (2X2MM) MF-PO-D-0164 revision 0.0 PACKAGE INFORMATION QFN-12 (2mmX2mm) PIN 1 ID MARKING PIN 1 ID SEE DETAIL A PIN 1 ID INDEX AREA BOTTOM VIEW TOP VIEW PIN 1 ID OPTION A 0.20x45° TYP. SIDE VIEW PIN 1 ID OPTION B R0.20 TYP. DETAIL A NOTE: 1) ALL DIMENSIONS ARE IN MILLIMETERS. 2) EXPOSED PADDLE SIZE DOES NOT INCLUDE MOLD FLASH. 3) LEAD COPLANARITY SHALL BE 0.10 MILLIMETERS MAX. 4) JEDEC REFERENCE IS MO-229. 5) DRAWING IS NOT TO SCALE. RECOMMENDED LAND PATTERN NOTICE: The information in this document is subject to change without notice. Please contact MPS for current specifications. Users should warrant and guarantee that third party Intellectual Property rights are not infringed upon when integrating MPS products into any application. MPS will not assume any legal responsibility for any said applications. MP5073 Rev.1.2 7/12/2017 www.MonolithicPower.com MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited. © 2017 MPS. All Rights Reserved. 16