MP5092 The Future of Analog IC Technology DESCRIPTION The MP5092 integrated a dual load switches to provide load protection covering 0.5V to 5.5V voltage range. Any one channel can work alone. Each channel can provide 7.5A load capability. With the small RDSON in tiny package, MP5092 provides very high efficient and space saving solution in notebook and tablet or other portable devices applications. With the soft start function, the MP5092 can avoid inrush current during circuit start up. MP5092 also provides different functions, like 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 ILIM pin to ground. Tiny 18 pins QFN 2mmx3mm of MP5092 is available in space saving package. Dual 5.5V, 7.5A Programmable Current Low RDSON Load Switch with Output Discharge Function FEATURES • • • • • • • • • • Integrated 10mΩ Low RDSON FETs Adjustable Start Up Slew Rate Wide VIN Range from 0.5V to 5.5V <1uA Shutdown Current Programmable 7.5A Current Limit Range Output Discharge Function Enable Pin <200ns Short-Circuitry Response Protection Thermal Protection Small QFN-18 (2mmx3mm) Package for Space Saving APPLICATIONS • • • • Notebook and Tablet Computers Portable Devices Solid State Drivers Handheld Devices All MPS parts are lead-free and adhere to the RoHS directive. For MPS green status, please visit MPS website under Products, Quality Assurance page. “MPS” and “The Future of Analog IC Technology” are registered trademarks of Monolithic Power Systems, Inc. TYPICAL APPLICATION MP5092 Rev. 1.0 1/8/2015 www.MonolithicPower.com MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited. © 2015 MPS. All Rights Reserved. 1 MP5092 – DUAL 5.5V, 7.5A LOW RDSON LOAD SWITCH WITH OUTPUT DISCHARGE FUNCTION ORDERING INFORMATION Part Number* MP5092GD Package QFN-18 (2mmx3mm) Top Marking See Below * For Tape & Reel, add suffix –Z (e.g. MP5092GD–Z); TOP MARKING AKF: product code of MP5092GD; Y: year code; LLL: lot number; PACKAGE REFERENCE TOP VIEW QFN-18 (2mmx3mm) MP5092 Rev. 1.0 1/8/2015 www.MonolithicPower.com MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited. © 2015 MPS. All Rights Reserved. 2 MP5092 – DUAL 5.5V, 7.5A LOW RDSON LOAD SWITCH WITH OUTPUT DISCHARGE FUNCTION ABSOLUTE MAXIMUM RATINGS (1) Thermal Resistance VIN1/2 .......................................... –0.3V to +6.5V VCC1/2 ......................................... –0.3V to +6.5V VOUT1/2 ........................................ –0.3V to +6.5V All Other Pins .......................–0.3V to Vcc+0.3 V Junction Temperature .............................. 150°C Lead Temperature ................................... 260°C (2) Continuous Power Dissipation QFN18 (2mmx3mm) ..................................1.8W QFN-18 (2mmx3mm) ……....…70 Recommended Operating Conditions (3) Supply Voltage VIN1/2 ...................... 0.5V to 5.5V Supply Voltage VCC1/2 ........................ 3V to 5.5V Output Voltage VOUT1/2.................... 0.5V to 5.5V Operating Junction Temp. (TJ). -40°C to +125°C MP5092 Rev. 1.0 1/8/2015 (4) θJA θJC 15 °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. © 2015 MPS. All Rights Reserved. 3 MP5092 – DUAL 5.5V, 7.5A LOW RDSON LOAD SWITCH WITH OUTPUT DISCHARGE FUNCTION 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 (Single Channel) Off State Leakage Current VCC Standby Current Symbol VIN VCC IOFF ISTBY Power FET ON Resistance Condition RDSON Min Typ 0.5 3 VIN=5V, EN=0 Max Units 5.5 5.5 V V 1 µA 1 330 µA VCC=5V, EN=0 VCC=5V, Enable, No load 0.1 220 VCC=5.0V VCC=3.3V 10 12 mΩ 155 30 °C °C Thermal Shutdown and Recovery (5) Shutdown Temperature TSTD (5) Hysteresis THYS Under/Over Voltage Protection (Single Channel) VCC Under Voltage Lockout VCC_UVLO UVLO Rising Threshold Threshold UVLO Hysteresis VUVLOHYS Soft Start SS pull-up current ISS Fixed slew rate Enable EN Rising Threshold VENH EN Hysteresis VENHYS ILIM RLIM=10.5kΩ, rise Io, (5) Current limit IOUT record its peak value (6) Current Limit Accuracy RLIM=50kΩ Discharge Resistance (Single Channel) Resistance RDIS 2.6 1.3 2.8 200 mV 9 µA 1.5 400 1.7 7.5 1.54 V 1.64 200 V mV A 1.74 A Ω Notes: 5) Guarantee by characterization -Not production tested. 6) If sense current is smaller than 1.5A, the accuracy will be affected by some internal offset. MP5092 Rev. 1.0 1/8/2015 www.MonolithicPower.com MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited. © 2015 MPS. All Rights Reserved. 4 MP5092 – DUAL 5.5V, 7.5A LOW RDSON LOAD SWITCH WITH OUTPUT DISCHARGE FUNCTION TYPICAL PERFORMANCE CHARACTERISTICS VIN = 3.6V, VCC = 3.6V, RLIM=10.5k, TA = 25°C, unless otherwise noted. 300 300 250 250 200 200 150 150 100 100 50 50 0 0 -50 2.5 3 3.5 4 4.5 5 5.5 6 6.5 0.5 0.45 0.4 0.35 0.3 0.25 0.2 -50 0 50 100 150 0.6 0.4 0.2 0 -0.2 -0.4 -0.6 -0.8 0 50 100 150 -1 1.8 1.8 1.6 1.6 1.4 1.4 1.2 1.2 1 1 0.8 0.8 0.6 0.6 0.4 0.4 0.2 0.2 0 -50 14 16 12 14 0 50 100 150 2 0 -50 3 4 5 6 0 50 100 150 60 50 12 10 40 10 8 8 6 30 6 4 4 2 2 0 2.5 1 0.8 3 3.5 MP5092 Rev. 1.0 1/8/2015 4 4.5 5 5.5 6 6.5 0 -50 20 10 0 50 100 150 0 0 1 2 3 4 www.MonolithicPower.com MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited. © 2015 MPS. All Rights Reserved. 5 6 7 8 9 5 MP5092 – DUAL 5.5V, 7.5A LOW RDSON LOAD SWITCH WITH OUTPUT DISCHARGE FUNCTION TYPICAL PERFORMANCE CHARACTERISTICS (continued) VIN = 3.6V, VCC = 3.6V, RLIM=10.5k, TA = 25°C, unless otherwise noted. 8 40 100000 7 35 10000 6 5 30 25 1000 4 20 100 3 2 MP5092 Rev. 1.0 1/8/2015 10 10 1 0 -40 -20 15 1 0 20 40 60 80 100 5 1 10 100 1000 0 0 1 2 3 4 www.MonolithicPower.com MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited. © 2015 MPS. All Rights Reserved. 5 6 7 8 9 6 MP5092 – DUAL 5.5V, 7.5A LOW RDSON LOAD SWITCH WITH OUTPUT DISCHARGE FUNCTION TYPICAL PERFORMANCE CHARACTERISTICS (continued) VIN = 3.6V, VCC = 3.6V, RLIM=10.5k, TA = 25°C, unless otherwise noted. Enable Startup Enable Startup Enable Shutdown VIN =3.6V, VCC=3.6V, No Load VIN =3.6V, VCC=3.6V, 7A Load VIN =3.6V, VCC=3.6V, No Load VOUT 2V/div. VEN 5V/div. VOUT 2V/div. VEN 5V/div. VOUT 2V/div. VEN 5V/div. ILIM 500mV/div. ILIM 500mV/div. ILIM 500mV/div. IOUT 5A/div. IOUT 5A/div. IOUT 5A/div. Enable Shutdown Enable Startup Enable Startup VIN =3.6V, VCC=3.6V, 7A Load VIN=1.8V, VCC=3.6V, No Load VIN=1.8V, VCC=3.6V, 7A Load VOUT 2V/div. VEN 5V/div. VOUT 1V/div. VEN 5V/div. VOUT 1V/div. VEN 5V/div. ILIM 500mV/div. ILIM 500mV/div. ILIM 500mV/div. IOUT 5A/div. IOUT 5A/div. IOUT 5A/div. Enable Shutdown Enable Shutdown Enable Startup VIN=1.8V, VCC=3.6V,No Load VIN=1.8V, VCC=3.6V, 7A Load VIN=1.1V, VCC=3.6V, No Load VOUT 1V/div. VEN 5V/div. VOUT 1V/div. VEN 5V/div. VOUT 1V/div. VEN 5V/div. ILIM 500mV/div. ILIM 500mV/div. ILIM 500mV/div. IOUT 5A/div. IOUT 5A/div. IOUT 5A/div. MP5092 Rev. 1.0 1/8/2015 www.MonolithicPower.com MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited. © 2015 MPS. All Rights Reserved. 7 MP5092 – DUAL 5.5V, 7.5A LOW RDSON LOAD SWITCH WITH OUTPUT DISCHARGE FUNCTION TYPICAL PERFORMANCE CHARACTERISTICS (continued) VIN = 3.6V, VCC = 3.6V, RLIM=10.5k, TA = 25°C, unless otherwise noted. Enable Startup Enable Shutdown Enable Shutdown VIN=1.1V, VCC=3.6V, 7A Load VIN=1.1V, VCC=3.6V, No Load VIN=1.1V, VCC=3.6V, 7A Load VOUT 1V/div. VEN 5V/div. VOUT 1V/div. VEN 5V/div. VOUT 1V/div. VEN 5V/div. ILIM 500mV/div. ILIM 500mV/div. ILIM 500mV/div. IOUT 5A/div. IOUT 5A/div. IOUT 5A/div. Power Up Power Up VIN =3.6V, VCC=3.6V, No Load VIN =3.6V, VCC=3.6V, 7A Load Power Down VIN =3.6V, VCC=3.6V, No Load VOUT 2V/div. VIN 2V/div. VOUT 2V/div. VIN 2V/div. VOUT 2V/div. VIN 2V/div. ILIM 500mV/div. ILIM 500mV/div. ILIM 500mV/div. IOUT 5A/div. IOUT 5A/div. IOUT 5A/div. Power Down Steady State VIN =3.6V, VCC=3.6V, 7A Load VIN =3.6V, VCC=3.6V, 7A Load VOUT 2V/div. VIN 2V/div. VOUT 2V/div. VIN 2V/div. ILIM 500mV/div. ILIM 500mV/div. IOUT 5A/div. IOUT 5A/div. MP5092 Rev. 1.0 1/8/2015 Load Transient Response VIN =5V, VCC=3.3V, IOUT=0A to 7A VOUT 2V/div. VIN 5V/div. IOUT 5A/div. www.MonolithicPower.com MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited. © 2015 MPS. All Rights Reserved. 8 MP5092 – DUAL 5.5V, 7.5A LOW RDSON LOAD SWITCH WITH OUTPUT DISCHARGE FUNCTION TYPICAL PERFORMANCE CHARACTERISTICS (continued) VIN = 3.6V, VCC = 3.6V, RLIM=10.5k, TA = 25°C, unless otherwise noted. SCP Entery SCP Steady State VIN =5V, VCC=3.3V, RLIM=10.5k VIN =5V, VCC=3.3V, RLIM=10.5k SCP Recovery VIN =5V, VCC=3.3V, RLIM=10.5k VOUT 2V/div. VOUT 2V/div. VOUT 2V/div. VIN 5V/div. VIN 5V/div. VIN 5V/div. IOUT 5A/div. IOUT 5A/div. IOUT 5A/div. MP5092 Rev. 1.0 1/8/2015 www.MonolithicPower.com MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited. © 2015 MPS. All Rights Reserved. 9 MP5092 – DUAL 5.5V, 7.5A LOW RDSON LOAD SWITCH WITH OUTPUT DISCHARGE FUNCTION PIN FUNCTIONS (2x3)QFN18 Pin # Name 1, 13 2, 12 3, 11 VIN1 VOUT1 VOUT2 4, 10 VIN2 5 EN2 6, 15 7 GND VCC2 8 ILIM2 9 SS2 14 EN1 16 VCC1 17 ILIM1 18 SS1 MP5092 Rev. 1.0 1/8/2015 Description Input Power Supply of Switch 1. Output to the Load of Switch 1. Output to the Load of Switch 2. Input Power Supply of Switch 2. Enable Input of Switch 2. Pulling this pin below the specified threshold shuts the chip down. Ground. Switch 2’s Supply Voltage to the Control Circuitry. Output Current Limit Configure of Switch 2. Place a resistor to ground to set the overload current limit level. Soft start control pin of load Switch 2. Connecting a capacitor from this pin to ground to set the soft start time. Enable Input of Switch 1. Pulling this pin below the specified threshold shuts the chip down. Switch 1’s Supply Voltage to the Control Circuitry. Output Current Limit Configure of Switch 1. Place a resistor to ground to set the overload current limit level. Soft Start Control Pin of Load Switch 1. Connecting a capacitor from this pin to ground to set the soft start time. www.MonolithicPower.com MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited. © 2015 MPS. All Rights Reserved. 10 MP5092 – DUAL 5.5V, 7.5A LOW RDSON LOAD SWITCH WITH OUTPUT DISCHARGE FUNCTION BLOCK DIAGRAM VIN1 Charge Pump Current Sense VCC 4 ILIM1 VOUT1 Fast Off Comp Soft Start 1V Current Limit Amp SS1 UVLO VCC Control Logic EN1 4 8 Thermal Sense 80 GND VCC1 Figure 1: Functional Block Diagram (Only Channel 1 Included, Channel 2 is the same) MP5092 Rev. 1.0 1/8/2015 www.MonolithicPower.com MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited. © 2015 MPS. All Rights Reserved. 11 MP5092 – DUAL 5.5V, 7.5A LOW RDSON LOAD SWITCH WITH OUTPUT DISCHARGE FUNCTION OPERATION The MP5092 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. MP5092 integrated two independent load switches. Any one channel can work alone. Each channel can provide 7.5A load capability. It provides an integrated solution to monitor output current to eliminate the need for an external current power MOSFET, and current sense device. Enable When input voltage is greater than the undervoltage lockout threshold (UVLO), typically 0.5V, MP5092 can be enabled by pulling EN pin to higher than 1.5V. Pulling down to ground will disable MP5092. The recommend start up sequence is power up VIN first. After VIN is ready, pull EN voltage to high. Current Limit The MP5092 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: ILIM ( A ) = 82000 R LIM (Ω) can be (1) RLIM is R1 and R2 which are placed between ILIM1/2 pin to ground in Figure 4. 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 MP5092 Rev. 1.0 1/8/2015 over temperature threshold is 155oC and hysteresis is 30oC.Bias Vcc Supply Vcc is the bias supply for internal analog circuit. It is better to have a decouple capacitor to filter the noise. If the main power voltage VIN is higher than 3V, the Vcc can be directly connected to VIN. 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 (about 13A), 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 80us. After that time period, it will re-turn on power FET.. Output Discharge MP5092 has output discharge function. This function can discharge the Vo 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 9uA constant current source charge SS cap and ramps up the voltage on the SS pin. The output voltage rises at 3 times the slew rate to the SS voltage. The soft-start time can be calculated by below equation: TSS (ms) = 1 VOUT ( V ) ⋅ C SS (nF) × (2) 3 ISS (uA ) TSS is the soft-start time, ISS is internal 9uA 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 Vo rising time will be just limited by power MOS charge time. www.MonolithicPower.com MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited. © 2015 MPS. All Rights Reserved. 12 MP5092 – DUAL 5.5V, 7.5A LOW RDSON LOAD SWITCH WITH OUTPUT DISCHARGE FUNCTION APPLICATION INFORMATION ILIM Resistor Selection The current limit value can be set by ILIM resistor. The current limit can be gotten by equation (1). The current limit threshold is suggested to 10% ~ 20% higher than maximum load current. For example, if the system’s full load is 7A, set the current limit to 7.7A. ILIM Capacitor Selection The internal advanced auto-zero comparator bring a high accuracy of current limit. The autozero will also cause some little jitter on ILIM pin. To get a more stable ILIM, a small ceramic capacitor can be mounted between ILIM and ground. Suggested place a ILIM capacitor less than 1nF. Soft Start Capacitor Selection There is an internal 9uA constant current source charge SS cap and ramps up the voltage on the SS pin. The output voltage rises follow 3 times the slew rate of SS voltage. If the inrush on output current reached the current limit during start up (like with large output cap or very large load), MP5092 will limit the output current and the same time, SS time will be increased (Figure 2). MP5092 Rev. 1.0 1/8/2015 Soft Start @ Different Output Capacitance VOUT Current Limit IIN Soft Start @ Small Capacitance VOUT Current Limit IIN Soft Start @ Large Capacitance VOUT Current Limit IIN Soft Start @ Very large Capacitance Figure 2: Soft Start Periods at different output capacitance www.MonolithicPower.com MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited. © 2015 MPS. All Rights Reserved. 13 MP5092 – DUAL 5.5V, 7.5A LOW RDSON LOAD SWITCH WITH OUTPUT DISCHARGE FUNCTION Design Example Some design examples are provided below. See Table 1 and Figure 3. Table 1 VIN (V) 5 5 5 Current limit (A) 3 5 7.5 RLIM (kΩ) 26.1 15.8 10.5 SS cap (nF) 22 47 100 SS time (ms) 4 9 20 Figure 3: Typical Application Schematic Layout Guide PCB layout is very important to achieve stable operation. Please follow these guidelines and take below figure for reference (take schematic in Figure 3 as an example). Place ILIM resistor (R1 and R2 in Figure 3) close to ILIM1/2 pin, input cap close to VCC pin. Put enough vias around IC to achieve better thermal performance. Figure 4: Recommended Layout MP5092 Rev. 1.0 1/8/2015 www.MonolithicPower.com MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited. © 2015 MPS. All Rights Reserved. 14 MP5092 – DUAL 5.5V, 7.5A LOW RDSON LOAD SWITCH WITH OUTPUT DISCHARGE FUNCTION PACKAGE INFORMATION QFN18 (2mmx3mm) PIN 1 ID MARKING PIN 1 ID 0.15X0.10 TYP PIN 1 ID INDEX AREA TOP VIEW BOTTOM VIEW SIDE VIEW NOTE: 0.15X0.10 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-220. 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. MP5092 Rev. 1.0 1/8/2015 www.MonolithicPower.com MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited. © 2015 MPS. All Rights Reserved. 15