MP5094GJ-Z

MP5094 Dual-Channel 12V/5V Current-Limit Switch with Output Over-Voltage Clamp in Small 3x3mm TSOT23-8 Package DESCRIPTION FEATURES The MP5094 is a protection device designed to protect circuitry on the output from transients on the input. The MP5094 also protects the input from undesired shorts and transients coming from the output. The MP5094 is a small RDS(ON), low quiescent current, dual-channel, currentlimited switch.     During start-up, the inrush current is limited by limiting the slew rate at the output. The slew rate is controlled by a capacitor at the SS pin.  The maximum load at the output is currentlimited. The magnitude of the current limit is fixed internally.   The output voltage is limited by an output overvoltage protection (OVP) function.  The MP5094 is available in a space-saving, 8pin, TSOT23 (3mmx3mm) package.     Integrated 5V, 12V Input Dual E-Fuse 24V 100ms Maximum Surge Input Voltage Tolerance for 12V Bus 16V 100ms Maximum Surge Input Voltage Tolerance for 5V Bus Integrated Dual-Channel Current-Limit Switch 50mΩ/30mΩ Low RDS(ON) for 12V Bus/5V Bus Current-Limit Switch 110μA Typical Low Quiescent Current for 12V Bus/5V Bus Adjustable Soft-Start Time Fixed 4A/2.95A Trip/Hold Current Limit for 12V Bus Fixed 3A/2.18A Trip/Hold Current Limit for 5V Bus Over-Current Protection (OCP) Hiccup Latch-Off Thermal Shutdown Available in a TSOT23-8 Package APPLICATIONS    Hard Disk Drives Solid-State Drives Hot Swap All MPS parts are lead-free, halogen-free, and adhere to the RoHS directive. For MPS green status, please visit the MPS website under Quality Assurance. “MPS”, the MPS logo, and “Simple, Easy Solutions” are trademarks of Monolithic Power Systems, Inc. or its subsidiaries. TYPICAL APPLICATION MP5094 Rev. 1.0 3/15/2019 www.MonolithicPower.com MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited. © 2019 MPS. All Rights Reserved. 1 MP5094 – DUAL-CHANNEL CURRENT-LIMITED SWITCH ORDERING INFORMATION Part Number* MP5094GJ Package TSOT23-8 (3mmx3mm) Top Marking See Below * For Tape & Reel, add suffix –Z (e.g. MP5094GJ–Z). TOP MARKING AYU: Product code of MP5094GJ Y: Year code PACKAGE REFERENCE TOP VIEW TSOT23-8 (3mmx3mm) MP5094 Rev. 1.0 3/15/2019 www.MonolithicPower.com MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited. © 2019 MPS. All Rights Reserved. 2 MP5094 – DUAL-CHANNEL CURRENT-LIMITED SWITCH PIN FUNCTIONS Pin # Name 1 VCC1 2 SS1 3 SS2 4 VCC2 5 6 VOUT2 GND 7 EN 8 VOUT1 Description Supply voltage of channel 1. The channel 1 typical input voltage is 12V. Use a ceramic capacitor to decouple the input rail. Connect VCC1 using a wide PCB trace. Channel 1 soft-start pin. Connect a capacitor from SS1 to ground to set the soft-start time. Channel 2 soft-start pin. Connect a capacitor from SS2 to ground to set the soft-start time. Supply voltage of channel 2. The channel 2 typical input voltage is 5V. Use a ceramic capacitor to decouple the input rail. Connect VCC2 using a wide PCB trace. Output terminal of channel 2. System ground. Enable pin for channel 1 and channel 2. EN is a digital input that turns the regulator on or off. Float EN or drive EN low to turn on the regulator. Drive EN high to turn off the regulator. Output terminal of the channel 1. ABSOLUTE MAXIMUM RATINGS (1) VCC1, VOUT1 ................................ -0.3V to 22V Input voltage transient (Ch1 100ms) ............ 24V VCC2, VOUT2 ................................ -0.3V to 15V Input voltage transient (Ch2 100ms) ............ 16V All other pins ................................... -0.3V to +5V Junction temperature ................-40°C to +150°C Lead temperature...................................... 260°C Continuous power dissipation (TA = +25°C) (2) TSOT23-8 (3mmx3mm) ............................ 1.89W Recommended Operating Conditions (3) Ch1 continuous supply voltage... 10.2V to 14.5V Ch2 continuous supply voltage....... 4.6V to 5.5V Operating junction temp. (TJ) ....-40°C to +125°C MP5094 Rev. 1.0 3/15/2019 Thermal Resistance θJA θJC TSOT23-8 EV5094-J-00A (4) ................... 66 ...... 23 ... °C/W JESD51-7 (5) ......................... 100 ..... 55 ... °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 of EV5094-J-00A board at any ambient temperature is calculated by PD (MAX) = (TJ (MAX)-TA)/θJA. Exceeding the maximum allowable power dissipation produces an excessive die temperature, causing the regulator to go into thermal shutdown. Internal thermal shutdown circuitry protects the device from permanent damage. Here, the max power of the TSOT23-8 is given by θJA on EV5094-J-00A. 3) The device is not guaranteed to function outside of its operating conditions. 4) Measured on EV5094-J-00A, 2-layer PCB, 54mmx46mm. 5) The value of θJA given in this table is only valid for comparison with other packages and cannot be used for design purposes. These values were calculated in accordance with JESD51-7 and simulated on a specified JEDEC board. They do not represent the performance obtained in an actual application. www.MonolithicPower.com MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited. © 2019 MPS. All Rights Reserved. 3 MP5094 – DUAL-CHANNEL CURRENT-LIMITED SWITCH ELECTRICAL CHARACTERISTICS VIN1 = 12V, VIN2 = 5V, COUT1 = COUT2 = 10μF, TJ = -40°C + 125°C +25°C unless otherwise noted. Parameter Supply Current Symbol IQ_CH1 Quiescent current IQ_CH2 Off-state leakage current Power MOSFET IOFF RDS(ON)_CH1 On resistance RDS(ON)_CH2 Tdelay_CH1 Turn-on delay (7) Tdelay_CH2 (6) , typical value is tested at TJ = Condition Output over-voltage response time (7) tOUT_OV_CH2 Typ V EN = low V EN = high V EN = low V EN = high VIN = 14V, V EN = 2V 110 10 110 6.5 TJ = 25°C TJ = 125°C TJ = 25°C TJ = 125°C V EN = 0V to Vo begins ramping up with a 3A load resistor V EN = 0V to Vo begins ramping up with a 2A load resistor 50 Under-/Over-Voltage Protection (UVP, OVP) VUVLO_CH1 Under-voltage lockout rising threshold VUVLO_CH2 VUVLOHYS_CH1 UVLO hysteresis VUVLOHYS_CH2 VOVLO_CH1 Output over-voltage clamp voltage VOVLO_CH2 tOUT_OV_CH1 Min Max Units 1 μA μA μA μA μA 70 30 50 9.2 4.1 14.5 5.5 COUT = 10µF, add a 30Ω load resistor, VIN1 = 12V to 18V/10µs COUT = 10µF, add a 10Ω load resistor, VIN2 = 5V to 7V/10µs mΩ mΩ mΩ mΩ 690 μs 690 μs 9.7 4.4 800 1.7 15 5.7 10.2 4.6 15.5 6.0 V V mV V V V 2 μs 2 μs Current Limit Current limit at normal operation Current limit response time (7) Secondary current limit (7) MP5094 Rev. 1.0 3/15/2019 ILimit_NO_CH1_TRIP ILimit_NO_CH2_TRIP ILimit_SC_CH1_Hold ILimit_SC_CH2_Hold tCL_CH1 tCL_CH2 ILimitH_CH1 ILimitH_CH2 3.6 2.65 2.7 1.95 4 2.95 3 2.18 15 15 8 8 www.MonolithicPower.com MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited. © 2019 MPS. All Rights Reserved. 4.4 3.25 3.3 2.4 A A A A μs μs A A 4 MP5094 – DUAL-CHANNEL CURRENT-LIMITED SWITCH ELECTRICAL CHARACTERISTICS (continued) VIN1 = 12V, VIN2 = 5V, COUT1 = COUT2 = 10μF, TJ = -40°C + 125°C +25°C unless otherwise noted. Parameter Enable Symbol EN falling threshold V EN _Falling Condition (6) , typical value is tested at TJ = Min Typ Max Units EN hysteresis V EN _HYS 250 mV EN pull-down resistor R EN _PD 280 KΩ Soft Start ISS_CH1 ISS_CH2 SS current OTP Thermal shutdown (7) TSD 4 4 5.5 5.5 155 7 7 μA μA °C NOTES: 6) Not tested in production, guaranteed by over-temperature correlation. 7) Guaranteed by design and engineering sample characterization. MP5094 Rev. 1.0 3/15/2019 www.MonolithicPower.com MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited. © 2019 MPS. All Rights Reserved. 5 MP5094 – DUAL-CHANNEL CURRENT-LIMITED SWITCH TYPICAL PERFORMANCE CHARACTERISTICS VIN1 = 12V, VIN2 = 5V, VEN = float, TA = 25°C, unless otherwise noted. Current Limit vs. Input Voltage (12V E-Fuse) Current Limit vs. Input Voltage (5V EFuse) 5 4 4.5 3.5 CURRENT LIMIT (A) CURRENT LIMIT (A) 4 3.5 3 2.5 2 1.5 1 Trip Hold 0.5 0 3 2.5 2 1.5 1 0 10 10.5 11 11.5 12 12.5 13 13.5 14 4.5 4.6 4.7 4.8 4.9 5 5.1 5.2 5.3 5.4 5.5 INPUT VOLTAGE (V) INPUT VOLTAGE (V) Quiescent Current vs. Input Voltage (12V E-Fuse) Quiescent Current vs. Input Voltage (5V E-Fuse) 140 140 QUIESCENT CURRENT (µA) QUIESCENT CURRENT (µA) Trip Hold 0.5 120 100 80 60 40 20 0 10 11 12 13 INPUT VOLTAGE (V) 14 120 100 80 60 40 20 0 15 4.5 4.6 4.7 4.8 4.9 5 5.1 5.2 5.3 5.4 5.5 INPUT VOLTAGE (V) Shutdown Current vs. Input Voltage (12V E-Fuse) Shutdown Current vs. Input Voltage (5V E-Fuse) V EN = 3.3V 50 45 45 SHUTDOWN CURRENT (µA) SHUTDOWN CURRENT (µA) V EN = 3.3V 50 40 35 30 25 20 15 10 5 0 40 35 30 25 20 15 10 5 0 10 11 12 13 INPUT VOLTAGE (V) MP5094 Rev. 1.0 3/15/2019 14 15 4.5 4.6 4.7 4.8 4.9 5 5.1 5.2 5.3 5.4 5.5 INPUT VOLTAGE (V) www.MonolithicPower.com MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited. © 2019 MPS. All Rights Reserved. 6 MP5094 – DUAL-CHANNEL CURRENT-LIMITED SWITCH TYPICAL PERFORMANCE CHARACTERISTICS (continued) VIN1 = 12V, VIN2 = 5V, VEN = float, TA = 25°C, unless otherwise noted. VIN UVLO Rising/Falling Threshold vs. Temperature (12V E-Fuse) VIN UVLO Rising/Falling Threshold vs. Temperature (5V E-Fuse) TA = -40°C to +125°C 10 5 9.8 4.5 9.6 9.4 9.2 9 8.8 8.6 8.4 UVLO_Rising 8.2 UVLO_Falling 8 -40 -20 0 20 40 60 80 100 120 140 TEMPERATURE (˚C) INPUT VOLTAGE (V) INPUT VOLTAGE (V) TA = -40°C to +125°C 4 3.5 3 2.5 2 1.5 1 UVLO_Rising 0.5 UVLO_Falling 0 -40 -20 0 20 40 60 80 100 120 140 TEMPERATURE (˚C) EN Rising/Falling Threshold vs. Temperature TA = -40°C to +125°C ENABLE VOLTAGE (V) 1.6 1.4 1.2 1 0.8 EN_Rising 0.6 EN_Falling 0.4 -40 -20 0 20 40 60 80 100 120 140 TEMPERATURE (˚C) MP5094 Rev. 1.0 3/15/2019 www.MonolithicPower.com MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited. © 2019 MPS. All Rights Reserved. 7 MP5094 – DUAL-CHANNEL CURRENT-LIMITED SWITCH TYPICAL PERFORMANCE CHARACTERISTICS (continued) VIN1 = 12V, VIN2 = 5V, VEN = float, TA = 25°C, unless otherwise noted. Start-Up through Input Voltage (12V E-Fuse) Start-Up through Input Voltage (5V E-Fuse) IOUT1 = 0A IOUT2 = 0A CH1: VOUT1 5V/div. CH1: VOUT2 2V/div. CH2: VIN1 10V/div. CH2: VIN2 5V/div. CH4: IOUT1 2A/div. CH4: IOUT2 2A/div. 5ms/div. 5ms/div. Start-Up through Input Voltage (12V E-Fuse) Start-Up through Input Voltage (5V E-Fuse) IOUT1 = 3A IOUT2 = 2A CH1: VOUT1 5V/div. CH1: VOUT2 2V/div. CH2: VIN1 10V/div. CH2: VIN2 5V/div. CH4: IOUT1 2A/div. CH4: IOUT2 2A/div. 5ms/div. 2ms/div. Start-Up through Input Voltage (12V E-Fuse) Start-Up through Input Voltage (5V E-Fuse) IOUT1 = 0A, COUT1 = 1000μF IOUT2 = 0A, COUT2 = 1000μF CH1: VOUT1 5V/div. CH1: VOUT2 2V/div. CH2: VIN1 10V/div. CH2: VIN2 5V/div. CH4: IOUT1 2A/div. CH4: IOUT2 2A/div. 5ms/div. MP5094 Rev. 1.0 3/15/2019 5ms/div. www.MonolithicPower.com MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited. © 2019 MPS. All Rights Reserved. 8 MP5094 – DUAL-CHANNEL CURRENT-LIMITED SWITCH TYPICAL PERFORMANCE CHARACTERISTICS (continued) VIN1 = 12V, VIN2 = 5V, VEN = float, TA = 25°C, unless otherwise noted. Shutdown through Input Voltage (12V E-Fuse) Shutdown through Input Voltage (5V E-Fuse) IOUT1 = 0A IOUT2 = 0A CH1: VOUT1 5V/div. CH1: VOUT2 2V/div. CH2: VIN1 10V/div. CH2: VIN2 5V/div. CH4: IOUT1 2A/div. CH4: IOUT2 2A/div. 20ms/div. 10ms/div. Shutdown through Input Voltage (12V E-Fuse) Shutdown through Input Voltage (5V E-Fuse) IOUT1 = 3A IOUT2 = 2A CH1: VOUT1 5V/div. CH1: VOUT2 2V/div. CH2: VIN1 10V/div. CH2: VIN2 5V/div. CH4: IOUT1 2A/div. CH4: IOUT2 2A/div. 1ms/div. 2ms/div. Start-Up through Enable (5V E-Fuse) Start-Up through Enable (12V EFuse) IOUT2 = 0A IOUT1 = 0A CH1: VOUT1 5V/div. CH1: VOUT2 2V/div. CH2: VIN1 10V/div. CH3: VEN 2V/div. CH2: VIN2 5V/div. CH3: VEN 2V/div. CH4: IOUT1 2A/div. CH4: IOUT2 2A/div. 5ms/div. MP5094 Rev. 1.0 3/15/2019 5ms/div. www.MonolithicPower.com MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited. © 2019 MPS. All Rights Reserved. 9 MP5094 – DUAL-CHANNEL CURRENT-LIMITED SWITCH TYPICAL PERFORMANCE CHARACTERISTICS (continued) VIN1 = 12V, VIN2 = 5V, VEN = float, TA = 25°C, unless otherwise noted. Start-Up through Enable (5V E-Fuse) Start-Up through Enable (12V EFuse) IOUT2 = 2A IOUT1 = 3A CH1: VOUT1 5V/div. CH1: VOUT2 2V/div. CH2: VIN1 10V/div. CH3: VEN 2V/div. CH4: IOUT1 2A/div. CH2: VIN2 5V/div. CH3: VEN 2V/div. CH4: IOUT2 2A/div. 5ms/div. 5ms/div. Start-Up through Enable (12V EFuse) Start-Up through Enable (5V E-Fuse) IOUT2 = 0A, COUT2 = 1000μF IOUT1 = 0A, COUT1 = 1000μF CH1: VOUT1 5V/div. CH1: VOUT2 2V/div. CH2: VIN1 10V/div. CH3: VEN 2V/div. CH2: VIN2 5V/div. CH3: VEN 2V/div. CH4: IOUT2 2A/div. CH4: IOUT1 2A/div. 5ms/div. 5ms/div. Shutdown through Enable (12V EFuse) Shutdown through Enable (5V EFuse) IOUT1 = 0A IOUT2 = 0A CH1: VOUT1 5V/div. CH1: VOUT2 2V/div. CH2: VIN1 10V/div. CH3: VEN 2V/div. CH2: VIN2 5V/div. CH3: VEN 2V/div. CH4: IOUT1 2A/div. CH4: IOUT2 2A/div. 10ms/div. MP5094 Rev. 1.0 3/15/2019 10ms/div. www.MonolithicPower.com MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited. © 2019 MPS. All Rights Reserved. 10 MP5094 – DUAL-CHANNEL CURRENT-LIMITED SWITCH TYPICAL PERFORMANCE CHARACTERISTICS (continued) VIN1 = 12V, VIN2 = 5V, VEN = float, TA = 25°C, unless otherwise noted. Shutdown through Enable (12V EFuse) Shutdown through Enable (5V EFuse) IOUT1 = 3A IOUT2 = 2A CH1: VOUT1 5V/div. CH1: VOUT2 2V/div. CH2: VIN1 10V/div. CH3: VEN 2V/div. CH4: IOUT1 2A/div. CH2: VIN2 5V/div. CH3: VEN 2V/div. CH4: IOUT2 2A/div. 100μs/div. 100μs/div. Current Limit (12V E-Fuse) Current Limit (5V E-Fuse) Increase IOUT1 slowly Increase IOUT2 slowly CH1: VOUT1 5V/div. CH1: VOUT2 2V/div. CH2: VIN1 10V/div. CH3: VEN 2V/div. CH4: IIN1 2A/div. CH2: VIN2 5V/div. CH3: VEN 2V/div. CH4: IIN2 2A/div. 500μs/div. 500μs/div. Short Circuit during Normal Operation (12V E-Fuse) CH1: VOUT1 5V/div. CH1: VOUT2 2V/div. CH2: VIN1 10V/div. CH3: VEN 2V/div. CH4: IIN1 5A/div. CH2: VIN2 5V/div. CH3: VEN 2V/div. CH4: IIN2 5A/div. 500μs/div. MP5094 Rev. 1.0 3/15/2019 Short Circuit during Normal Operation (5V E-Fuse) 500μs/div. www.MonolithicPower.com MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited. © 2019 MPS. All Rights Reserved. 11 MP5094 – DUAL-CHANNEL CURRENT-LIMITED SWITCH TYPICAL PERFORMANCE CHARACTERISTICS (continued) VIN1 = 12V, VIN2 = 5V, VEN = float, TA = 25°C, unless otherwise noted. Short Circuit before EN Start-Up (12V E-Fuse) Short Circuit before EN Start-Up (5V E-Fuse) CH1: VOUT1 5V/div. CH1: VOUT2 2V/div. CH2: VIN1 10V/div. CH3: VEN 2V/div. CH2: VIN2 5V/div. CH3: VEN 2V/div. CH4: IIN1 2A/div. CH4: IIN2 2A/div. 500μs/div. 500μs/div. Output Over-Voltage Protection (12V E-Fuse) Output Over-Voltage Protection (5V E-Fuse) VIN1 = 12 - 17V, IOUT1 = 1.5A VIN2 = 5 - 7V, IOUT2 = 1A CH1: VOUT1 5V/div. CH1: VOUT2 2V/div. CH2: VIN1 5V/div. CH3: VEN 2V/div. CH2: VIN2 2V/div. CH3: VEN 2V/div. CH4: IOUT1 2A/div. CH4: IOUT2 2A/div. 10μs/div. MP5094 Rev. 1.0 3/15/2019 10μs/div. www.MonolithicPower.com MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited. © 2019 MPS. All Rights Reserved. 12 MP5094 – DUAL-CHANNEL CURRENT-LIMITED SWITCH 5.5uA 5.5uA BLOCK DIAGRAM Figure 1: Functional Block Diagram MP5094 Rev. 1.0 3/15/2019 www.MonolithicPower.com MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited. © 2019 MPS. All Rights Reserved. 13 MP5094 – DUAL-CHANNEL CURRENT-LIMITED SWITCH OPERATION The MP5094 is a dual-channel, current-limited switch designed to limit inrush current to the load when a circuit card is inserted into a live backplane power source. This limits the backplane’s voltage drop and the dV/dt of the voltage to the load. The MP5094 offers an integrated solution to monitor input voltage, output voltage, output current, and die temperature, which eliminates the need for an external current-sense power resistor, power MOSFET, and thermal sense device. Under-Voltage Lockout (UVLO) Channel 1 can be used in the 12V input supply system, and channel 2 can be used in the 5V input supply system. High-energy transients can occur during normal operation or during a hot swap. These transients depend on the parasitic inductance and resistance of the wire and the capacitor at the VCC node. If the power clamp (TVS, Tranzorb) diode is not used, the Efuse must be able to withstand this transient voltage. The MP5094 has an integrated highvoltage MOSFET and uses a high-voltage circuit for the VCC node to guarantee safe operation. If the supply (input) is below the under-voltage lockout (UVLO) threshold, the output is disabled. When the supply goes above the UVLO threshold, the output is enabled. Soft Start (SS) Connect a capacitor to the soft-start pin (SS) to set the soft-start time. A constant-current source charges the SS capacitor and generates a linear ramping voltage on SS. The output voltage rises at a similar slew rate to the SS voltage. The soft-start time is a function of the capacitor (CSS) and can be calculated with Equation (1): t ss (ms)  1V C SS (nF) VINX  5.5 μA VCLAMPX (1) Where tSS is the soft-start time (from 0 - 100% VOUT), VINx is the input voltage of the current limit switch, and VCLAMPx is the clamping voltages of the 5V and 12V current limit switches (5.7V and 15V respectively). MP5094 Rev. 1.0 3/15/2019 Fast Output Over-Voltage Protection (OVP) The MP5094 provides an output over-voltage protection (OVP) function to protect the downstream load when there is a surge voltage at the input. An accurate and fast comparator monitors the over-voltage condition of the output. If the output voltage rises above the threshold, the gate of the internal MOSFET is pulled down quickly and is regulated to a certain value to maintain the output voltage clamped at the OVP threshold. The fast loop response speed (typically 2µs) keeps the overvoltage overshoot small. Current Limit When the MP5094 is active, if load reaches the trip current (threshold current triggers overcurrent protection) or a short is present, the MP5094 switches into constant-current (holdcurrent) mode. The MP5094 enters hiccup protection mode if the over-current condition remains for longer than 150µs. The MP5049 restarts automatically after 200ms of off time. This operation repeats until the over-current condition is removed. The channel 1 trip current is set to 4A internally, and the hold current is 2.95A. The channel 2 trip current is set to 3A internally, and the hold current is 2.18A. Short-Circuit Protection (SCP) If the load current increases rapidly due to a short-circuit event, the current may exceed the current-limit threshold before the control loop can respond. If the current reaches the 8A secondary current-limit level, a fast turn-off circuit activates to turn off the power MOSFET. This can help limit the peak current through the switch, keeping the input voltage from dropping too much. The total short-circuit response time is less than 1µs. After the MOSFET is switched off, the MP5049 restarts. During the restart process, if the short still remains, the MP5094 regulates the gate voltage to hold the current at a normal current-limit level. The IC enters hiccup mode with 200ms of off time. www.MonolithicPower.com MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited. © 2019 MPS. All Rights Reserved. 14 MP5094 – DUAL-CHANNEL CURRENT-LIMITED SWITCH Enable ( EN ) EN is a digital control pin that turns the current limit switch on and off. Drive EN high to turn off the current-limit switch. Drive EN low to turn on the current-limit switch. An internal 280kΩ resistor from EN to GND allows EN to be floated to turn on the MP5094 automatically. MP5094 Rev. 1.0 3/15/2019 Thermal Shutdown Thermal shutdown prevents the chip from operating at exceedingly high temperatures. When the silicon die temperature exceeds 155°C, the entire chip shuts down. www.MonolithicPower.com MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited. © 2019 MPS. All Rights Reserved. 15 MP5094 – DUAL-CHANNEL CURRENT-LIMITED SWITCH APPLICATION INFORMATION Soft-Start Time Setting The soft-start time is a function of the capacitor (CSS). The typical value of this capacitor can be calculated with Equation (2): t ss (ms)  1V C SS (nF) VINX  5.5 μA VCLAMPX (2) Where tss is the soft-start time (from 0 - 100% VOUT), VINx is the input voltage of the current limit switche, and VCLAMPx is the clamping voltages of the 5V and 12V current limit switches (5.7V and 15V respectively). For example, if the external SS capacitor is 68nF, the soft-start time is about 10ms for both the 5V and 12V current-limit switches. PCB Layout Guidelines Efficient PCB layout is critical for stable operation. For best results, refer to Figure 2 and follow the guidelines below. 1. Place the high-current paths (VCC, VOUT) close to the device using short, direct, and wide traces. 2. Place the input capacitors close to the VCC and GND pins. 3. Connect the VCC and VOUT pads to large VCC and VOUT planes respectively for better thermal performance. 4. Place a SS capacitor close to the SS pin. MP5094 Rev. 1.0 3/15/2019 Figure 2: Recommended Layout Design Example Table 1 shows a design example following the application guidelines for specifications below. Table 1: Design Example 12V VIN1 12V VOUT1 5V VIN2 5V VOUT2 10ms SS time The detailed application circuit is shown in Figure 3. The typical performance and circuit waveforms are shown in the Typical Performance Characteristics section. For more detailed device applications, please refer to the related evaluation board datasheet. www.MonolithicPower.com MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited. © 2019 MPS. All Rights Reserved. 16 MP5094 – DUAL-CHANNEL CURRENT-LIMITED SWITCH TYPICAL APPLICATION CIRCUITS Figure 3: Typical Application Circuit MP5094 Rev. 1.0 3/15/2019 www.MonolithicPower.com MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited. © 2019 MPS. All Rights Reserved. 17 MP5094 – DUAL-CHANNEL CURRENT-LIMITED SWITCH PACKAGE INFORMATION TSOT23-8 (3mmx3mm) See note 7 EXAMPLE TOP MARK PIN 1 ID IAAAA RECOMMENDED LAND PATTERN TOP VIEW SEATING PLANE SEE DETAIL’’A’’ FRONT VIEW SIDE VIEW NOTE: DETAIL ’’A’’ 1) ALL DIMENSIONS ARE IN MILLIMETERS . 2) PACKAGE LENGTH DOES NOT INCLUDE MOLD FLASH, PROTRUSION OR GATE BURR. 3) PACKAGE WIDTH DOES NOT INCLUDE INTERLEAD FLASH OR PROTRUSION. 4) LEAD COPLANARITY(BOTTOM OF LEADS AFTER FORMING) SHALL BE 0.10 MILLIMETERS MAX. 5) JEDEC REFERENCE IS MO-193, VARIATION BA. 6) DRAWING IS NOT TO SCALE. 7) PIN 1 IS LOWER LEFT PIN WHEN READING TOP MARK FROM LEFT TO RIGHT, (SEE EXAMPLE TOP MARK) 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. MP5094 Rev. 1.0 3/15/2019 www.MonolithicPower.com MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited. © 2019 MPS. All Rights Reserved. 18