PI5PD2556ZCEX

PI5PD2556/PI5PD2557 Precision Adjustable Current -Limited Power Switch Features Description           The PI5PD2556/2557 series is single-channel powerdistribution switch intended for applications where precision current limiting is required or heavy capacitive loads and short circuits are encountered. These devices offer a programmable current-limit threshold between 500 mA and 5A (typ) per channel via an external resistor. The power-switch rise and fall times are controlled to minimize current surges during turn on/off. Meets USB Current-Limiting Requirement ±6.5% Current-Limit Accuracy at 4.0A Adjustable Current Limit, 500mA-5A (typ.) Fast Over-current Response - 3.5μS (typ.) 22mΩ High-Side MOSFET Operating Range: 2.5 V to 5.5V 2-μA Maximum Standby Supply Current Built-in Soft-Start 15 kV / 8 kV System-Level ESD Capable Device Package: TDFN 3x3-8L Each channel of the PI5PD2556/2557 devices limits the output current to a safe level by switching into a constant-current mode when the output load exceeds the current-limit threshold.  UL Listed – File No. E341484  CB Certified Applications     Typical Application Circuit USB Ports/Hubs Digital TV Set-Top Boxes VOIP Phones IN VVout IN R1 10 0k Cin 0. 1uF O UT Vout Cout IN O UT IL IM Pin Configuration /FAU LT /FAULT1 Sign al Radj EN Con trol In put GND 1 8 FAULT G ND P ow er Pa d IN 2 7 OUT IN 3 6 OUT /EN(EN) 4 5 ILIM Figure 1 Typical Application Circuit TDFN 3x3-8L (Top View) TDFN 2x3-8L (Top View) Pin Description Pin Name Pin No. PI5PD2556 Type Description Ground. PI5PD2557 1 GND - 2, 3 IN I 4 /EN EN I Power input voltage. Enable input, logic low turns on power switch for PI5PD2556, logic high turns on power switch for PI5PD2557. External resistor used to set current-limit threshold; recommended 20 kΩ ≤ RILIM ≤ 187 kΩ. 5 ILIM I 6, 7 OUT O Power switch output for channel two 8 /FAULT O Active-low open-drain output, asserted during over-current or overtemperature condition or reverse voltage occurs All trademarks are property of their respective owners. 2017-01-0010 www.diodes.com 1 1/19/2017 PT0497-5 PI5PD2556/PI5PD2557 Maximum Ratings Storage Temperature ................................................................................... -65oC to +150oC Supply Voltage to Ground Potential ............................................................-0.5V to +6.0V DC Input Voltage......................................................................................-0.5V to VDD+0.5V Voltage range from IN to OUT ......................................................................-0.5V to+6.0V Control Input Voltage (VIN) ...........................................................................-0.5V to+6.0V Continuous total power dissipation(1).......................................................................2400mW Continuous FAULT sink current ..................................................................................25mA Power Dissipation .............................................................................................................. 0.5W ESD: HBM Mode...........................................................................................................4000V CDM Mode.............................................................................................................. 500V ESD-system level (contact/air)...............................................................................8kV/15kV Note: 1. Stresses greater than those listed under MAXIMUM RATINGS may cause permanent damage to the device. This is a stress rating only and functional operation of the device at these or any other conditions above those indicated in the operational sections of this specification is not implied. Exposure to absolute maximum rating conditions for extended periods may affect reliability. 2. The JEDEC high-K (2s2p) board used to derive this data was a 3in × 3in, multilayer board with 1ounce internal power and ground planes and 2ounce copper traces on top and bottom of the board. Recommended operation conditions Symbol VIN Parameter Input Voltage VEN PI5PD2556 Conditions Min. Typ. Max. Unit - 2.5 - 5.5 V - 0 - 5.5 0 - 5.5 Input Voltage V V/EN PI5PD2557 VIH High-level input voltage on EN - 1.1 - - V VIL Low-level input voltage on EN - - - 0.66 V IOUT Continuous output current per channel, OUT - 0 - 5 A IFAULT Continuous /FAULT sink current - - - 10 mA RILIM Recommended resistor limit range - 20 - 187 kΩ Operating Temperature Range - -40 - 85 ºC TA All trademarks are property of their respective owners. 2017-01-0010 www.diodes.com 2 1/19/2017 PT0497-5 PI5PD2556/PI5PD2557 DC Electrical Characteristics VI(IN)= 5.0V; TA=-40°C to +85°C; unless otherwise specified. Sym Test Conditions(1) Description Min. Typ. Max. Unit Power Switch RDS(on) Static drain-source on-state resistance tr Rise time, output tf Fall time, output - - 22 35 mΩ 1 0.5 0.3 0.2 2 1 0.5 0.4 4 3 1.0 0.6 ms 1.1 - - 0.6 5 2 RILIM=27.4 kΩ RILIM=61.9kΩ RILIM=100kΩ 3750 1590 935 4040 1785 1100 4260 1960 1260 VIN = 5 V, current ramp (≤ 100 A/s) on OUT 3800 4500 5000 950 1250 1500 - 3.5 - - 0.1 2 - 95 120 - 85 110 - 0.01 1.0 VIN Rising - 2.35 2.45 V TA=25°C - 35 - mV I/FAULT =1mA - - 180 mV V/FAULT =5.5V FAULT assertion or de-assertion due to over-current condition - - 1 A 4 9 15 ms VI(IN) = 5.0V VI(IN) = 2.5V VI(IN) = 5.0V VI(IN) = 2.5V CL = 1F, RL = 100Ω Enable EN VIH VIL ton toff High-level input voltage Low-level input voltage Turn on time Turn off time 2.5 V ≤ VI(IN) ≤ 5.5 V 2.5 V ≤ VI(IN) ≤ 5.5 V CL = 1F, RL = 100Ω V ms Current Limit IOS IOC_TRIP Current-limit threshold @ VOUT = VIN * 0.8 mA RILIM=27.4kΩ Overcurrent trip threshold VIN = 5 V, current ramp (≤ 100 A/s) on OUT RILIM=100kΩ tIOS Response time to short circuit VIN = 5.0V s Supply Current ISTB Input supply current at output disable ISS Input supply current at output enable IREV Reverse Leakage Current No load on OUT, VEN=disable TA =25°C No load on OUT, RILIM=24.9kΩ VEN=5.0V , RILIM=100kΩ TA=25°C VOUTx=5.5V, VIN=0V， TA=25°C A Under Voltage Lockout UVLO Low-level input voltage Hysteresis for low-level input voltage /FAULT FLAG VOL Output low voltage IOFF Off-state leakage TD /FAULT deglitch Thermal Shutdown OTSD2 OTSD Thermal shutdown threshold Thermal shutdown threshold in currentlimit - - 155 - - - 135 - Hysteresis - - 20 - °C Note: Pulse-testing techniques maintain junction temperature close to ambient temperature; thermal effects must be taken into account separately. All trademarks are property of their respective owners. 2017-01-0010 www.diodes.com 3 1/19/2017 PT0497-5 PI5PD2556/PI5PD2557 Parameter Measurement information Figure 2 Test Circuit and Voltage Waveforms IN VIN Vout R1 10 0k Cin 0. 1uF O UT Vout Cout COUT=150uF IN O UT IL IM /FAU LT /FAULT1 Sign al Radj RLIM=24.9kohm EN Con trol In put G ND P ow er Pa d Figure 3 Typical Characteristics Reference Schematic All trademarks are property of their respective owners. 2017-01-0010 www.diodes.com 4 1/19/2017 PT0497-5 PI5PD2556/PI5PD2557 Typical characteristic VOUT 2V/div VOUT 2V/div VEN 5V/div VEN 5V/div IIN 2A/div IIN 2A/div t - Time - 2 mS/div t - Time - 2 mS/div Figure 3 Turn-on Delay and Rise Time Figure 4 Turn-off Delay and Fall Time VOUT 2V/div VEN 5V/div VFAULT 5V/div VFAULT 5V/div IIN 5A/div IIN 2AV/div t - Time - 2 mS/div t - Time - 4 mS/div Figure 5 Device Enabled into Short-Circuit Figure 6 Full-Load to Short-Circuit Transient Response VOUT 5V/div VFAULT 5V/div IIN 5A/div t - Time - 10 ms/div Figure 7 Short-Circuit to Full-Load Recovery Response All trademarks are property of their respective owners. 2017-01-0010 www.diodes.com 5 1/19/2017 PT0497-5 PI5PD2556/PI5PD2557 Figure 8 IIN & Junction Temperature, Output Disabled Figure 9 IIN & Junction Temperature , Output Enabled Figure 11 MOSFET Ron & Junction Temperature IDS - Static Drain-Source Current - A Figure 10 IIN & VIN Supply Voltage Figure 5 UVLO & Junction Temperature -40°C 25°C 125°C RLIM = 100kohm VIN-VOUT mV/div Figure 12 UVLO – Under voltage Lockout – V Figure 13 Switch Current Vs. Drain-Source Voltage Across All trademarks are property of their respective owners. 2017-01-0010 www.diodes.com 6 1/19/2017 PT0497-5 IDS - Static Drain-Source Current - A PI5PD2556/PI5PD2557 -40°C 25°C 125° C RLIM = 61.9 kohm VIN-VOUT mV/div Figure 14 Switch Current Vs. Drain-Source Voltage Across Functional Block Diagram Figure 15 Functional Block Diagram Functional Description Overview The PI5PD2556/2557 is a single-channel, current-limited power-distribution switch using N-channel MOSFETs for applications where short circuits or heavy capacitive loads will be encountered. This device allows the user to program the current-limit threshold between 500 mA and 5.0 A (typ) via an external resistor. This device incorporates an internal charge pump and gate drive circuitry necessary to drive the N-channel MOSFETs. The charge pump supplies power to the driver circuit for each channel and provides the necessary voltage to pull the gate of the MOSFET above the source. The charge pump operates from input voltages as low as 2.5 V and requires little supply current. The driver controls the gate voltage of the power switch. The driver incorporates circuitry that controls the rise and fall times of the output voltage to limit large current and voltage surges and provides built-in soft-start functionality. The PI5PD2556/2557 limits the output current to the programmed current-limit threshold IOS during an over-current or short-circuit event by reducing the charge pump voltage driving the N-channel MOSFET and operating it in the linear range of operation. The result of limiting the output current to IOS reduces the output voltage at OUT because the N-channel MOSFET is no longer fully enhanced. All trademarks are property of their respective owners. 2017-01-0010 www.diodes.com 7 1/19/2017 PT0497-5 PI5PD2556/PI5PD2557 Over-current Conditions When an over-current condition is detected, the device maintains a constant output current and reduces the output voltage accordingly. The PI5PD2556/2557 thermal cycles if an overload condition is present long enough to activate thermal limiting in any of the above cases. The device turns off when the junction temperature exceeds 135°C (min) while in current limit. The device remains off until the junction temperature cools 20°C (typ) and then restarts. The PI5PD2556/2557 cycles on/off until the overload is removed. /FAULT Response The FAULT open-drain outputs are asserted (active low) during an over-current or over-temperature condition. The PI5PD2556/2557 asserts the FAULTx signal until the fault condition is removed and the device resumes normal operation. The PI5PD2556/2557 is designed to eliminate false FAULT reporting by using an internal delay "deglitch" circuit (9-ms typ) for overcurrent conditions without the need for external circuitry. This ensures that FAULT is not accidentally asserted due to normal operation such as starting into a heavy capacitive load. The deglitch circuitry delays entering and leaving current-limited induced fault conditions. The FAULT signal is not deglitched when the MOSFET is disabled due to an over-temperature condition but is deglitched after the device has cooled and begins to turn on. This unidrectional deglitch prevents FAULT oscillation during an over-temperature event. Under-voltage Lockout (UVLO) The under-voltage lockout (UVLO) circuit disables the power switch until the input voltage reaches the UVLO turn-on threshold. Built-in hysteresis prevents unwanted on/off cycling due to input voltage droop during turn on. Enable (EN OR /EN) The logic enables control the power switches and device supply current. The supply current is reduced to less than 2-μA when a logic high is present on /EN or when a logic low is present on EN. A logic low input on /EN or a logic high input on EN enables the driver, control circuits, and power switches. The enable inputs are compatible with both TTL and CMOS logic levels. Thermal Sense The PI5PD2556/2557 self protects by using two independent thermal sensing circuits that monitor the operating temperature of the power switch and disable operation if the temperature exceeds recommended operating conditions. The PI5PD2556/2557 operates in constant-current mode during an over-current condition, which increases the voltage drop across the power switch. The power dissipation in the package is proportional to the voltage drop across the power switch, which increases the junction temperature during an over-current condition. The first thermal sensor (OTSD) turns off the power switch when the die temperature exceeds 135°C (min) and the chip is in current limit. Hysteresis is built into the thermal sensor, and the switch turns on after the device has cooled approximately 20°C. The PI5PD2556/2557 also has a second ambient thermal sensor (OTSD2). The ambient thermal sensor turns off power switch when the die temperature exceeds 155°C (min) regardless of whether the power switch are in current limit and will turn on the power switches after the device has cooled approximately 20°C. The PI5PD2556/2557 continues to cycle off and on until the fault is removed. All trademarks are property of their respective owners. 2017-01-0010 www.diodes.com 8 1/19/2017 PT0497-5 PI5PD2556/PI5PD2557 Application Information Input and Output Capacitance Input and output capacitance improves the performance of the device; the actual capacitance should be optimized for the particular application. For all applications, a 0.1uF or greater ceramic bypass capacitor between IN and GND is recommended as close to the device as possible for local noise decoupling. This precaution reduces ringing on the input due to power-supply transients. Additional input capacitance may be needed on the input to reduce voltage overshoot from exceeding the absolute-maximum voltage of the device during heavy transient conditions or output shorting. This is especially important during bench testing when long inductive cables are used to connect the evaluation board to the bench power supply. Normally suggested the distance between IC and DC supply source is less than 15cm. Output capacitance also need to be close to IC as possible. When large transient currents are expected on the output , placing a high-value electrolytic capacitor on the output pin is recommended. Programming the Current-Limit Threshold The overcurrent threshold is user programmable via an external resistor. The PI5PD2556/57 uses an internal regulation loop to provide a regulated voltage on the ILIM pin. The current-limit threshold is proportional to the current sourced out of ILIM. The recommended 1% resistor range for RILIM is 20 kΩ ≤ RILIM ≤ 187 kΩ to ensure stability of the internal regulation loop. Many applications require that the minimum current limit is above a certain current level or that the maximum current limit is below a certain current level, so it is important to consider the tolerance of the overcurrent threshold when selecting a value for RILIM. The following equations approximate the resulting overcurrent threshold for a given external resistor value ®ILIM). Consult the Electrical Characteristics table for specific current limit settings. The traces routing the RILIM resistor to the PI5PD2556/57 should be as short as possible to reduce parasitic effects on the current-limit accuracy. Figure 16 Current Limit Threshold & RILIM All trademarks are property of their respective owners. 2017-01-0010 www.diodes.com 9 1/19/2017 PT0497-5 PI5PD2556/PI5PD2557 Application 1: Designing above a Minimum Current Limit Some applications require that current limiting cannot occur below a certain threshold. For this example, assume that 3 A must be delivered to the load so that the minimum desired current-limit threshold is 3000 mA. Use the IOS equations and Figure 7 to select RILIM. Select the closest 1% resistor less than the calculated value: RILIM = 33.2 kΩ. This sets the minimum current-limit threshold at 3000 mA . Use the IOS equations, Figure 7, and the previously calculated value for RILIM to calculate the maximum resulting current-limit threshold. The resulting maximum current-limit threshold is 3592 mA with a 33.2 kΩ resistor. Application 2: Designing Below a Maximum Current Limit Some applications require that current limiting must occur below a certain threshold. For this example, assume that the desired upper current-limit threshold must be below 5000 mA to protect an up-stream power supply. Use the IOS equations and Figure 7 to select RILIM. Select the closest 1% resistor greater than the calculated value: RILIM = 23.7kΩ. This sets the maximum current-limit threshold at 5000 mA . Use the IOS equations, Figure 7, and the previously calculated value for RILIM to calculate the minimum resulting current-limit threshold. The resulting minimum current-limit threshold is 4316 mA with a 23.7 kΩ resistor Accounting For resistor Tolerance The previous sections described the selection of RILIM given certain application requirements and the importance of understanding the current-limit threshold tolerance. The analysis focused only on the PI5PD2556/57 performance and assumed an exact resistor value. However, resistors sold in quantity are not exact and are bounded by an upper and lower tolerance centered around a nominal resistance. The additional RILIM resistance tolerance directly affects the current-limit threshold accuracy at a system level. The following table shows a process that accounts for worst-case resistor tolerance assuming 1% resistor values. Step one follows the selection process outlined in the application examples above. Step two determines the upper and lower resistance bounds of the selected resistor. Step three uses the upper and lower resistor bounds in the IOS equations to calculate the threshold limits. It is important to use tighter tolerance resistors, e.g. 0.5% or 0.1%, when precision current limiting is desired. All trademarks are property of their respective owners. 2017-01-0010 www.diodes.com 10 1/19/2017 PT0497-5 PI5PD2556/PI5PD2557 Table 1. Common RILIM Resistor Selections Desired Nominal Ideal Closet 1% Current Limit (mA) Resistor Resistor (kΩ) 750 1000 1250 1500 1750 2000 2250 2500 2750 3000 3250 3500 3750 4000 4250 4500 4750 5000 5250 5500 146.9 110.2 88.2 73.6 63.1 55.2 49.1 44.2 40.2 36.9 34 31.6 29.5 27.7 26.0 24.6 23.3 22.1 21.1 20.1 (kΩ) 147 110 88.7 73.2 63.4 54.9 48.7 44.2 40.2 36.5 34 31.6 29.4 27.4 26.1 24.9 23.2 22.1 21 20 Resistor Tolerance 1% Low (kΩ) 1% High(kΩ) 145.5 108.9 87.8 72.5 62.8 54.4 48.2 43.8 39.8 36.1 33.7 31.3 29.1 27.1 25.8 24.7 23 21.9 20.8 19.8 148.5 111.1 89.6 73.9 64 55.4 49.2 44.6 40.6 36.9 34.3 31.9 29.7 27.7 26.4 25.1 23.4 22.3 21.2 20.2 All trademarks are property of their respective owners. 2017-01-0010 Actual Limits Ios Min (mA) 605 825 1039 1276 1489 1737 1975 2191 2425 2689 2901 3138 3390 3656 3851 4050 4369 4602 4861 5121 www.diodes.com 11 Ios Nor (mA) 749 1002 1244 1508 1742 2012 2269 2501 2750 3030 3253 3501 3764 4039 4241 4446 4773 5011 5274 5539 Ios Max (mA) 886 1166 1430 1725 1965 2252 2523 2765 3025 3315 3545 3800 4068 4349 4554 4761 5091 5331 5595 5859 1/19/2017 PT0497-5 PI5PD2556/PI5PD2557 Mechanical Information TDFN 3.0x3.0-8L Note: For latest package info, please check: http://www.pericom.com/products/packaging/mechanicals.php Ordering Information Part No. PI5PD2556ZCEX PI5PD2557ZCEX Package Code ZC ZC Package 8-pin, 3x3 (TDFN), Tape & reel 8-pin, 3x3 (TDFN), Tape & reel Note: • Thermal characteristics can be found on the company web site at www.pericom.com/packaging/ • E = Pb-free and Green • X suffix = Tape/Reel All trademarks are property of their respective owners. 2017-01-0010 www.diodes.com 12 1/19/2017 PT0497-5 PI5PD2556/PI5PD2557 IMPORTANT NOTICE DIODES INCORPORATED MAKES NO WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, WITH REGARDS TO THIS DOCUMENT, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE (AND THEIR EQUIVALENTS UNDER THE LAWS OF ANY JURISDICTION). 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