MP62550/MP62551 Precision 60mA-1.7A Programmable Current-Limited Power Distribution Switch The Future of Analog IC Technology DESCRIPTION FEATURES MP62550/MP62551 Power Distribution Switch is designed for precision current limiting and provides up to 1.5A continuous output current. It offers programmable current limit between 60mA and 1.7A (typ) with ±10% accuracy by an external resistor. The switch includes an 88mΩ N-channel Power MOSFET and operates from 2.5V to 5.5V input voltage. The device has built-in protection for both over current and increased thermal stress. For over current, the device will limit the current by changing to a constant current mode. It will shutdown when its internal temperature reaches unsafe levels and recover once the device temperature reduces approx 10°C. It provides built-in soft-start which controls the rise and fall times of the output voltage to limit the initial inrush current and voltage surges. The reverse-voltage protection feature turns off the MOSFET to protect the device. • • • • • • • • • • • • • Up to 1.5A Continuous Output Current ±10% Current-Limit Accuracy Adjustable Current-Limit, 60mA -1700mA (typ) Fast Over-current Response 2μs (typ) 2.5V to 5.5V Supply Range 88mΩ MOSFET (TQFN Package) 1.5μA Maximum Standby Supply Current Reverse Input-Output Voltage Protection Built-in Soft-Start Thermal-Shutdown Protection Automatic-on after Fault Removed Under-Voltage Lockout Deglitched Fault Report • FLAG won't Change State at Input UVLO Transition Bidirectional Fault Deglitch Time Active Low & Active High Options • • ________ APPLICATIONS • • • • • • • ________ The FLAG output will report a fail mode (low level) when over current or over temperature is ________ encountered. The FLAG will not change state when the input UVLO is triggered. The MP62550/MP62551 is available in space saving 6-pin TQFN 2x2mm package and TSOT23-6 package. Smart Phone and PDA Portable GPS Device Notebook PC Set-top-box Telecom and Network Systems PC Card Hot Swap USB Power Distribution 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 GND VIN FLAG R FLAG 10k OUT IN FLAG ILIM EN * GND + VOUT R ILIM EN* GND PAD MP62551 (*EN active low for MP62550) MP62550/MP62551 Rev. 1.21 www.MonolithicPower.com 6/27/2013 MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited. © 2013 MPS. All Rights Reserved. 1 MP62550/MP62551 –60mA-1.7A PROGRAMMABLE CURRENT-LIMITED POWER DISTRIBUTION SWITCHES ORDERING INFORMATION Part Number* Enable MP62550DGT Active Low MP62551DGT Active High MP62550DJ Active Low MP62551DJ Active High Maximum Switch Continuous Load Current Single 1.5A Single 1.5A Package Top Marking Free Air Temperature (TA) TQFN6 (2x2mm) TQFN6 (2x2mm) 5Y AJ -40°C to +85°C TSOT23-6 5Y TSOT23-6 AAN -40°C to +85°C * For Tape & Reel, add suffix –Z (e.g. MP62551DGT–Z). For RoHS compliant packaging, add suffix –LF (e.g. MP62551DGT–LF–Z) PACKAGE REFERENCE TOP VIEW TOP VIEW OUT 1 6 IN ILIM 2 5 GND FLAG 3 4 EN EXPOSED PAD ON BACKSIDE IN 1 6 OUT GND 2 5 ILIM EN 3 4 FLAG TSOT23-6 TQFN6 (2x2mm) MP62550/MP62551 Single-Channel (EN active low for MP62550) ABSOLUTE MAXIMUM RATINGS (1) IN to GND ....................................-0.3V to +6.5V ________ ILIM, EN, FLAG, OUT to GND .....-0.3V to +6.5V RILIM Range (1%)......................12.4kΩ to 210kΩ Continuous Power Dissipation (TA = +25°C) (2) TQFN(2x2)-6............................................ 1.56W TSOT23-6 ................................................ 0.57W Lead Temperature ....................................260°C Storage Temperature............... -65°C to +150°C Maximum Junction Temp. (TJ) .............. +125°C Thermal Resistance (3) θJA θJC TQFN6 (2x2mm)…. ................80 ...... 16 ... °C/W TSOT23-6…...........................220 .... 110 .. °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 junctiontoambient thermal resistance θJA, and the ambient temperature TA. The maximum allowable continuous power dissipation at any ambient temperature is calculated by Exceeding the maximum PD(MAX)=(TJ(MAX)-TA)/θJA. 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) Measured on JESD51-7, 4-layer PCB. MP62550/MP62551 Rev. 1.21 www.MonolithicPower.com 6/27/2013 MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited. © 2013 MPS. All Rights Reserved. 2 MP62550/MP62551 –60mA-1.7A PROGRAMMABLE CURRENT-LIMITED POWER DISTRIBUTION SWITCHES ELECTRICAL CHARACTERISTICS TA=+25°C, 2.5V≤VIN≤5.5V, 12.4kΩ≤RILIM≤210kΩ, RFLAG=10kΩ, unless otherwise noted. Parameters IN Voltage Range Symbol VIN Test Conditions Min 2.5 Typ Max 5.5 TQFN2x2-6 88 135 TSOT23-6 100 135 125 145 μA 1.5 μA 0.01 1 μA 1530 1700 1870 960 1190 1360 450 510 570 105 135 166 45 60 85 FET On_Resistance RDS(on) VIN=5V, IOUT=100mA -40°C≤TA≤+85°C Supply Current IIN_ON Device Enabled, VOUT=float, VIN=5.5V Shutdown Current IIN_OFF Device Disabled, VOUT=float, VIN=5.5V Reverse Current Leakage IREV VIN=0V, VOUT=5.5V RILIM=13kΩ RILIM=20kΩ Current Limit (See Figure 2) IOS RILIM=49.9kΩ RILIM=210kΩ -40°C≤TA≤85°C, OUT connected to GND ILIM Shorted to IN Short Current Response Time TIOS Under-voltage Lockout INUVVTH Under-voltage Hysteresis INUVHYS EN Input Logic High Voltage EN Input Logic Low Voltage EN Input Leakage Current VIN=5V (See Figure 2) 2 VIN Rising Edge 2.25 mΩ mA μs 2.45 130 VIHEN Units V V mV 1.1 V VILEN -0.5 0.66 V 0.5 μA IEN VEN=0-5.5V VOL IFLAG=1mA 180 mV IFLAG_OFF VFLAG=5.5V 1 μA TFLAG_DEG Delay time for assertion or deassertion due to over-current condition 10 ms ________ FLAG Output Logic Low Voltage ________ FLAG Output Leakage Current High ________ FLAG Deglitch Time Reverse-Voltage Comparator Trip Point (VOUT – VIN) Time from ReverseVoltage to MOSFET Turn Off VR_TRIP TR_RES VIN=5V 3.5 7.5 135 mV 5 ms MP62550/MP62551 Rev. 1.21 www.MonolithicPower.com 6/27/2013 MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited. © 2013 MPS. All Rights Reserved. 3 MP62550/MP62551 –60mA-1.7A PROGRAMMABLE CURRENT-LIMITED POWER DISTRIBUTION SWITCHES ELECTRICAL CHARACTERISTICS (4) (continued) TA=+25°C, 2.5V≤VIN≤5.5V, 12.4kΩ≤RILIM≤210kΩ, RFLAG=10kΩ, unless otherwise noted. Parameters Thermal Shutdown Threshold Thermal Shutdown Threshold in CurrentLimit Condition Thermal Shutdown Hysteresis Symbol Test Conditions Min Typ Max Units TJ 155 °C TJ_CL 135 °C TJ_HYS 10 0.5 0.75 °C VOUT Rising Time Tr(5) RLOAD=100Ω, CLOAD=1μF VIN=5.5V VIN=2.5V VOUT Falling Time Tf (6) RLOAD=100Ω, CLOAD=1μF VIN=5.5V 0.1 0.4 VIN=2.5V 0.1 0.4 (7) Turn On Time Ton Turn Off Time Toff (8) RLOAD=100Ω, CLOAD=100μF 1.5 3 30 ms ms Notes: 4) Production test at +25°C. Specifications over the temperature range are guaranteed by design and characterization. 5) Measured from 10% to 90% output signal. 6) Measured from 90% to 10% output signal. 7) Measured from 50% EN signal to 90% output signal. 8) Measured from 50% EN signal to 10% output signal. MP62550/MP62551 Rev. 1.21 www.MonolithicPower.com 6/27/2013 MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited. © 2013 MPS. All Rights Reserved. 4 MP62550/MP62551 –60mA-1.7A PROGRAMMABLE CURRENT-LIMITED POWER DISTRIBUTION SWITCHES PIN FUNCTIONS TQFN6 (9) TSOT23 Name Pin # Pin # I/O Description 1 6 OUT O Switch output. The VOUT of the internal power FET and output terminal of the IC. 2 5 ILIM O External resistor used to set current-limit, recommended 12.4kΩ ≤ RILIM ≤ 210kΩ. 3 4 FLAG ————— O Fault status. Logic Low when over-current, over-temperature. Open Drain. 4 3 EN I Enable input. Active Low: (MP62550), Active High: (MP62551). 5 2 GND 6 1 IN PAD Ground. Externally connected to PAD. I Input Voltage. Accepts 2.5V to 5.5V input. Internally connected to GND. Used to heat-sink the part to the circuit board traces. Connect PAD to GND pin externally. PAD Notes: 9) The part has thermal pad on the backside and the pad is GND. PARAMETER MEASUREMENT INFORMATION OUT Tf Tr CL RL VO(OUT) 90% 10% 90% 10% TEST CIRCUIT 50% 50% VI(EN) VI(EN) Ton VO(OUT) Toff 50% Toff Ton VO(OUT) 90% 50% 10% 90% 10% VOLTAGE WAVEFORMS Figure 1—Definition of Tr, Tf, Ton, and Toff Figure 2—Short Circuit Response Time MP62550/MP62551 Rev. 1.21 www.MonolithicPower.com 6/27/2013 MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited. © 2013 MPS. All Rights Reserved. 5 MP62550/MP62551 –60mA-1.7A PROGRAMMABLE CURRENT-LIMITED POWER DISTRIBUTION SWITCHES BLOCK DIAGRAM Reverse Voltage UVLO COMP IN OUT Current Sense Charge Pump Current Limit Logic AMP Vref FLAG EN* 8ms Deglitch Thermal Sense ILIM GND * EN is active low for MP62550 Figure 3—Function Block Diagram MP62550/MP62551 Rev. 1.21 www.MonolithicPower.com 6/27/2013 MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited. © 2013 MPS. All Rights Reserved. 6 MP62550/MP62551 –60mA-1.7A PROGRAMMABLE CURRENT-LIMITED POWER DISTRIBUTION SWITCHES TYPICAL PERFORMANCE CHARACTERISTICS VIN=5V, RILIM=20kΩ, RFLAG=10kΩ, COUT=100μF, TA=+25°C, unless otherwise noted. Supply Current, Output Supply Current, Output Static Drain-Source On-State Enabled vs. Input Voltage Disabled vs. Input Voltage Resistance vs. Input Voltage VEN=3.3V 0.2 SUPPLY CURRENT (uA) 120 110 100 80 2 2.5 3 3.5 4 4.5 5 5.5 6 Input to Output Voltage vs. Load Current INPUT TO OUTPUT VOLTAGE (mV) 180 0.1 160 140 0 120 100 VIN=2.5V 160 VIN=3.3V 140 120 VIN=4.5V 80 VIN=5V 60 40 VIN=5.5V 20 0 0.2 -0.2 2 2.5 3 3.5 4 4.5 5 5.5 60 2 2.5 6 0.4 0.6 0.8 1 1.2 OUTPUT CURRENT (A) 3 3.5 4 4.5 5 5.5 6 INPUT VOLTAGE (V) Static Drain-Source On-State Resistance Variation vs. Ambient Temperature VIN=5V, IOUT=0.1A VEN=3.3V 200 100 80 INPUT VOLTAGE (V) INPUT VOLTAGE (V) 180 VEN=3.3V, IOUT=1A, TSOT Package 200 -0.1 90 0 VEN=0 30 25 20 15 10 5 0 -5 -10 -15 -20 -25 -30 -45 -30 -15 0 3 SHORT CURRENT (A) SUPPLY CURRENT (uA) 130 2.5 2 1.5 1 0.5 0 15 30 45 60 75 90 2 2.5 3 3.5 4 4.5 5 5.5 6 INPUT VOLTAGE (V) Short Circuit Response Time vs. Peak Current 3 VEN=3.3V 2.5 2 1.5 1 0.5 0 2 3 4 5 6 7 8 9 10 PEAK C U R R EN T (A) MP62550/MP62551 Rev. 1.21 www.MonolithicPower.com 6/27/2013 MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited. © 2013 MPS. All Rights Reserved. 7 MP62550/MP62551 –60mA-1.7A PROGRAMMABLE CURRENT-LIMITED POWER DISTRIBUTION SWITCHES TYPICAL PERFORMANCE CHARACTERISTICS (continued) VIN=5V, RILIM=20kΩ, RFLAG=10kΩ, COUT=100μF, TA=+25°C, unless otherwise noted. VOUT 2V/div. VOUT 2V/div. Device Enabled VEN 5V/div. VEN 5V/div. Device Enabled Device Disabled VEN 2V/div. Current Limit Inrush Current Limit IIN 500mA/div. IIN 500mA/div. IIN 500mA/div. Output Short Circuit Applied VOUT 2V/div. VFLAG 5V/div. IOUT 1.00A/div. VOUT 2V/div. No Load FAULT Asserted After Deglitch Period Current Limit Short Inrush Current VFLAG 5V/div. IIN 1.00A/div. FAULT Asserted After Deglitch Period Device Begins Thermal Cycling Device Turns Off and Re-enables into Current-Limit Output Short Circuit Applied VOUT 2V/div. VOUT 2V/div. VFLAG 5V/div. IIN 1.00A/div. No Load FAULT Asserted After Deglitch Period Device Begins Thermal Cycling Device Enters Current-Limit VFLAG 5V/div. IIN 1.00A/div. Output Short Circuit Removed Output Short Circuit Removed VOUT 2V/div. VFLAG 5V/div. IIN 1.00A/div. VOUT 2V/div. VIN 2V/div. FAULT De-asserted After Deglitch Period IIN 1.00A/div. Device Thermal Cycling when Short-Circuit Presents FAULT De-asserted After Deglitch Period Device Thermal Cycling when Short-Circuit Presents VIN=5V 5.5V Applied to Vout VOUT VIN Device Shutdown Due to Reverse Voltage Reverse Current Until Device Turns off MP62550/MP62551 Rev. 1.21 www.MonolithicPower.com 6/27/2013 MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited. © 2013 MPS. All Rights Reserved. 8 MP62550/MP62551 –60mA-1.7A PROGRAMMABLE CURRENT-LIMITED POWER DISTRIBUTION SWITCHES TYPICAL PERFORMANCE CHARACTERISTICS (continued) VIN=5V, RILIM=20kΩ, RFLAG=10kΩ, COUT=100μF, TA=+25°C, unless otherwise noted. VOUT 2V/div. VIN 2V/div. VOUT=5.5V 5.5V Removed from Vout No Load VIN=5V Reverse-Voltage Recovery, Power Switch Re-enables VOUT 2V/div. VFLAG 5V/div. IIN 1.00A/div. Device Shutdown Due to Reverse Voltage Ramp load Applied Ramp load Removed FAULT De-asserted After Deglitch Period FAULT Asserted After Deglitch Period VOUT 2V/div. Device Enabled VEN 2V/div. Ramp load IOUT 1.00A/div. Current Limit IOUT 500mA/div. Inrush Current Limit MP62550/MP62551 Rev. 1.21 www.MonolithicPower.com 6/27/2013 MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited. © 2013 MPS. All Rights Reserved. 9 MP62550/MP62551 –60mA-1.7A PROGRAMMABLE CURRENT-LIMITED POWER DISTRIBUTION SWITCHES DETAILED DESCRIPTION The MP62550/MP62551 is a precision currentlimit power distribution switch which can provide up to 1.5A continuous output current. It allows the user to program the current-limit between 60mA and 1.7A (typ) with ±10% accuracy via an external resistor connected between ILIM and GND pins. The switch includes an N-channel power MOSFET and an internal charge pump to generate the gate driver voltage which is higher than input. The charge pump can work from input as low as 2.5V. The device has built-in protection for both over current and increased thermal stress. For over current, the device will limit the current by changing to a constant current mode. It will shutdown when its internal temperature reaches unsafe levels and recover once the device temperature reduces approx 10°C. It provides built-in soft-start which controls the rise and fall times of the output voltage to limit the initial inrush current and voltage surges. The reverse-voltage protection feature turns off the MOSFET to protect the device. ________ The FLAG output will report a fail mode (low level) when over current or over temperature is ________ encountered. The FLAG will not change state when the input UVLO is triggered. Over Current MP62550/MP62551 switches into to a constantcurrent mode when responding to over-current conditions. It ramps the output current to current limit value IOS and reduces the output voltage accordingly. MP62550/MP62551 will be thermal cycles only if the over current condition stays long enough to trigger thermal protection. Trigger over current protection for different overload conditions occurring in applications: 1) The output has been shorted or overloaded before the device is enabled or input applied. MP62550/MP62551 detects the short or overload and switches into constant-current mode immediately. current condition within time TIOS. The currentsense amplifier is overdriven, so high current may flow during this period of time and the internal current-limit MOSFET is disabled momentarily before the current-limit circuit can react. Then the current-sense amplifier recovers switches into constant-current mode. Similar to the previous case, the MP62550/MP62551 will limit the current to IOS until the overload condition is removed or the device entering thermal cycle. 3）Output current has been gradually increased beyond the recommended operating current. The load current rises until the current-limit threshold is reached or until the thermal limit of the device is exceeded. The MP62550/MP62551 is capable of delivering current up to the current-limit without damaging the device. Reverse-Voltage Protection To prevent damage the device on the input side of MP62550/MP62551, the N-channel MOSFET will be turned off immediately whenever the output voltage exceeds the input voltage by 135mV (typ). There is an internal comparator which compares the voltage difference betweens drain and source of N-channel MOSFET. The reverse voltage protection circuit only activates when RDS(on) x IReverse>135mV, that means there must be a temporary large reverse current from output to input that can trigger the reversevoltage protection. After the comparator is triggered, the internal driver circuit starts to discharge the gate voltage via a constant current. It needs several milliseconds to fully turn off the N-channel MOSFET. This protection could prevent significant current sinking into the input side. The MP62550/MP62551 exist the protection mode and enter to normal state once the reverse-voltage condition is removed. No need to recycle the input power or enable logic. There is no reverse current flow through the switch at the condition of 0V input and 5.5V output whatever the enable is high or low. 2) A short or an overload occurs after the device is enabled. The device responds to the over- MP62550/MP62551 Rev. 1.21 www.MonolithicPower.com 6/27/2013 MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited. © 2013 MPS. All Rights Reserved. 10 MP62550/MP62551 –60mA-1.7A PROGRAMMABLE CURRENT-LIMITED POWER DISTRIBUTION SWITCHES Flag Response ________ The FLAG pin is an open drain configuration. When over current or over temperature is ________ encountered, FLAG will report a fail mode (low level). For over current, 7.5ms deglitch time-out is needed. This is used to ensure that no false fault signal is reported. This internal deglitch circuit eliminates the need for components. ________ For over temperature, the FLAG pin is not deglitched. ________ The FLAG will not change state when the input UVLO is triggered. Under-voltage Lockout (UVLO) This circuit is used to monitor the input voltage to ensure that the MP62550/MP62551 is operating correctly. This UVLO circuit also ensures that there is no operation until the input voltage reaches the minimum spec. Built-in 130mV hysteresis prevents unwanted on/off power cycling due to input voltage drop from large current surges. Enable The logic pin disables the chip to reduce the supply current. Enable high activate the MP62551 while enable low activate the MP62550. The device will operate once the enable signal reaches the appropriate level. There is no hysteresis for enable pin. The input is compatible with both COMS and TTL. Thermal Protection The purpose of thermal protection is to prevent damage in the IC by allowing exceptive current to flow and heat the junction. The die temperature is internally monitored by two independent thermal sensing circuits until the thermal limit is reached. The first thermal sensor turns off the power switch when the die temperature exceeds 135°C (min) and the part is in current limit. The second thermal sensor turns off the power-switch when the die temperature exceeds 155°C (min) regardless of whether the switch is in current limit. Both two thermal sensors have built-in hysteresis. It will turn on the switch once it is cooled down 10°C approximately. MP62550/MP62551 continues to cycle off and on until the fault is removed. MP62550/MP62551 Rev. 1.21 www.MonolithicPower.com 6/27/2013 MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited. © 2013 MPS. All Rights Reserved. 11 MP62550/MP62551 –60mA-1.7A PROGRAMMABLE CURRENT-LIMITED POWER DISTRIBUTION SWITCHES APPLICATION INFORMATION Power-Supply Considerations Over 10μF capacitor between IN and GND is recommended. This precaution reduces powersupply transients that may cause ringing on the input and improves the immunity of the device to short-circuit transients. In order to achieve smaller output load transient ripple, placing a high-value electrolytic capacitor on the output pin is recommended when the load is heavy. A 0.01μF to 0.1μF ceramic bypassing capacitor is recommended to improve the immunity of the device to transient conditions and noise. GND VIN FLAG R FLAG 10k OUT IN FLAG ILIM EN * GND + VOUT R ILIM EN* GND PAD MP62551 * EN is active low for MP62550 RILIM can be selected to provide a current limit that occurs 1) above a minimum load current or 2) below a maximum load current. To determine above a minimum current limit, find the maximum desired load current on the Ios(min) curve and choose a value of RILIM below this value. The resulting maximum current limit is the intersection of the selected value of RILIM and the Ios(max) curve. To determine below a maximum current limit, find the maximum desired load current on the Ios(max) curve and choose a value of RILIM above this value. The resulting minimum current limit is the intersection of the selected value of RILIM and the Ios(min) curve. In theory, the result of current limit multiplied by RILIM is a constant. But the internal amplifier has offset, as a result the current limit vs 1/RILIM is not linear at small programming resistor range. The theoretical current limit calculation formula is given as following: 18.818V IOSnom (A) = RILIM0.9248kΩ Figure 4—Application Circuit Programming the Current-Limit The current-limit is programmed via an external resistor from ILIM to GND. The recommended is 1% resistor range of RILIM 12.4kΩ≤RILIM≤210kΩ. The ILIM pin can be connected to IN to set the current-limit at its minimum level of 60mA (typ). It’s important to consider the tolerance of current limit when selecting a value for RILIM. Some applications require that the minimum current limit is above a certain current level, while some applications require the maximum current limit is below a certain current level. IOS min (A) = 18.489V RILIM0.9342kΩ IOS max (A) = 18.229V RILIM0.8944kΩ Where: 12.4kΩ ≤ RILIM ≤ 210kΩ . For better accuracy current limit setting, Table1 and Figure5 are highly recommended. Those curve or data are provided basing on large amount experimental test results. Figure 5 can be used to calculate the current limit value for a given ILIM resistor and also can be used to select ILIM resistor for a certain current limit. MP62550/MP62551 Rev. 1.21 www.MonolithicPower.com 6/27/2013 MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited. © 2013 MPS. All Rights Reserved. 12 MP62550/MP62551 –60mA-1.7A PROGRAMMABLE CURRENT-LIMITED POWER DISTRIBUTION SWITCHES Figure 5—Current-Limit vs RILIM MP62550/MP62551 Rev.1.21 www.MonolithicPower.com 6/27/2013 MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited. © 2013 MPS. All Rights Reserved. 13 MP62550/MP62551 –60mA-1.7A PROGRAMMABLE CURRENT-LIMITED POWER DISTRIBUTION SWITCHES Table 1 shows the common RILIM vs. current limit data. 1% accuracy resistor is recommended for general applications. If a precision current limit is needed, it’s better to use more tightly tolerance resistors, e.g. 0.5% or 0.1%. Resistor accuracy tolerance is not included in Table 1. Table 1—Common RILIM Resistor Selections (10) 1% Accuracy Resistor (kΩ) 12.4 13 15 15.8 16.9 18.2 20 21.5 23.2 26.1 28.7 32.4 37.4 43.2 49.9 52.3 66.5 88.7 133 210 Short ILIM to IN Input IN OUT ILIM Output CLOAD RLOAD FLAG GND EN POWER PAD Figure 6—Auto-Retry Application Current Limit (A) IOS 1.749 1.700 1.533 1.467 1.370 1.293 1.190 1.130 1.053 0.947 0.861 0.772 0.650 0.579 0.510 0.495 0.391 0.286 0.198 0.135 0.060 VOUT 2V/div. VEN 2V/div. IIN 1A/div. Figure 7—Auto-Retry Waveform ________ When over-current happens the FLAG will report a low level, EN is pulled down immediately and thus the part is shutdown. ________ During the moment of EN shutdown, the FLAG changes to high impedance allowing CRETRY to begin charging. After a time delay determined by the RC constant, the EN voltage reaches its turn-on threshold and re-enables the part. The part will continue to cycle in this manner until the fault condition is removed. Notes: 10) Above current limit vs. RILIM data is typical value only and NOT guaranteed by production. Refer to EC table for more accurate current limit setting. While the maximum recommended value of RILIM is 210kΩ, there is one additional configuration that allows for a lower current limit. The ILIM pin may be connected directly to IN to provide a 60 mA (typ) current limit. Auto-Retry Function Figure 6 shows an auto-retry circuit implanted by an external resistor and capacitor. MP62550/MP62551 Rev.1.21 www.MonolithicPower.com 6/27/2013 MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited. © 2013 MPS. All Rights Reserved. 14 MP62550/MP62551 –60mA-1.7A PROGRAMMABLE CURRENT-LIMITED POWER DISTRIBUTION SWITCHES PACKAGE INFORMATION TQFN6 (2x2mm) PIN 1 ID MARKING 1.90 2.10 0.25 0.35 1.90 2.10 PIN 1 ID INDEX AREA 0.90 1.10 0.20 0.30 1 6 1.50 1.70 0.65 BSC 3 4 TOP VIEW PIN 1 ID CHAMFER 0.30X45º BOTTOM VIEW 0.70 0.80 0.20 REF 0.00 0.05 SIDE VIEW NOTE: 1.90 0.60 1) ALL DIMENSIONS ARE IN MILLIMETERS. 2) EXPOSED PADDLE SIZE DOES NOT INCLUDE MOLD FLASH. 3) LEAD COPLANARITY SHALL BE 0.10 MILLIMETER MAX. 4) JEDEC REFERENCE IS MO-229, VARIATION VCCC. 5) DRAWING IS NOT TO SCALE. 1.00 0.25 1.60 0.65 RECOMMENDED LAND PATTERN MP62550/MP62551 Rev.1.21 www.MonolithicPower.com 6/27/2013 MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited. © 2013 MPS. All Rights Reserved. 15 MP62550/MP62551 –60mA-1.7A PROGRAMMABLE CURRENT-LIMITED POWER DISTRIBUTION SWITCHES TSOT23-6 NOTICE: The information in this document is subject to change without notice. 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. MP62550/MP62551 Rev. 1.21 www.MonolithicPower.com 6/27/2013 MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited. © 2013 MPS. All Rights Reserved. 16