NCP374 Overvoltage Up to +30 V and Down to -30 V with Load Switch Function NCP374 is an over-voltage and over-current protection device. From IN to VBUS , the part acts as a load switch protection, with programmable current regulation. The current protection is externally adjustable. Additional voltage protection is available, from VBUS to IN. Due to built-IN low RDS(on) NMOS fet, the host system is protected against positive and negative voltage up to +28 V and down to -28 V. The both embedded over-current and over-voltage protection allows sustaining extreme conditions from short circuit on USB connector, or defective WA or USB port. Due to the NCP374 using internal NMOS, the system cost and the PCB area of the application board are minimized. NCP374 provides a negative going flag (FLAG) output, which alerts the system that a fault has occurred. Features * * * * * * * * * * * Adjustable Over-Current Over-voltage Protection Up to 28 V and Down to -28 V Logic Pins EN and DIR Thermal Shutdown On-Chip Low RDS(on) NMOS Transistors Over-Voltage Lockout (OVLO) Soft Start. Real Shutdown Mode Alert FLAG Output. 12 Leads LLGA 4 x 4 mm Package This is a Pb-Free Device May, 2012 - Rev. 0 XXXXXX XXXXXX ALYWG G 1 TLLGA12 CASE 513AP A = Assembly Location L = Wafer Lot Y = Year W = Work Week G = Pb-Free Package (Note: Microdot may be in either location) VBUS 1 12 NC VBUS 2 11 IN GND 3 10 FLAG RES1 4 RES2 RES3 NCP374 9 DIR 5 8 EN 6 7 Ilim ORDERING INFORMATION See detailed ordering, marking and shipping information in the package dimensions section on page 10 of this data sheet. USB Ports Tablets Set Top Box Cell Phones (c) Semiconductor Components Industries, LLC, 2012 MARKING DIAGRAM (Top View) Typical Applications * * * * http://onsemi.com 1 Publication Order Number: NCP374/D NCP374 POWER SUPPLY IN NCP374 4.7 mF 1 mF VBUS VBUS GND RES RES RES IN FLAG DIR EN Ilim 1 mF LDO 3.3 V 1 IN OUT 3 2 STATUS EN VCC GND USB HOST CONTROLLER SYS SYSTEM 12 11 5 CRTL[x:0] VBUS(sense) 2 DATA[x:0] D+ 3 D- 4 GND VBUS D+ D- GND USB PORT 10 10 USB PORT CRTL_OUT[x:0] DATA_OUT[x:0] VCC CRTL_IN[x:0] DATA_IN[x:0] GND 12 VBUS(sense) CRTL[x:0] D+ DATA[x:0] 11 D- GND GND 5 2 3 4 GND VBUS D+ D- GND USB TRANSCEIVER USB TRANSCEIVER VCC 1 120 mF Downstream USB Port Upstream USB Port Figure 1. Typical Host Application Circuit D+ D- D+ PHY (Transceiver) Ctr D- LDO Vbus VBUS D+ D- GND NCP374 Wall Adapter USB PORT VBUS D+ D- GND 1 mF1 VBUS IN VBUS GND FLAG RES DIR RES EN RES Ilim 10k CCCV CHARGER /FLAG /DIR /EN Wall Adapter LI+BATTERY /FLAG 4.7 mF1 Rlimit1 /DIR /REV Ctr GND Figure 2. Typical Portable Application Circuit http://onsemi.com 2 SYSTEM NCP374 FUNCTIONAL BLOCK DIAGRAM Exposed pad - Pad 1 IN - Pin 11 VBUS - Pin 1 and 2 Gate 2 Driver: Negative voltage and reverse current protection Gate 1 Driver: Positive voltage OCP block ILIM - Pin 7 UVLO OVLO Core negative voltage protection LDO VREF Charge Pump RES1 - Pin 4 5.5 V Control logic and Timer EN block Trim RES2 - Pin 5 RES3 - Pin 6 Thermal Shutdown /EN - Pin 8 /DIR - Pin 9 Not Connected - Pin 10 GND - Pin 3 FLAG - Pin 10 Figure 3. Functional Block Diagram http://onsemi.com 3 NCP374 PIN FUNCTION DESCRIPTION Pin Pin Name Type 1, 2 VBUS POWER VBUS voltage pins: must be hardwired together on the PCB. These pins are connected to the VBUS connector, and are protected against positive and negative overvoltage events. A 1 mF low ESR ceramic capacitor, or larger, must be connected between these pins and GND. 3 GND POWER Ground 4 RES1 INPUT Reserved pin. Must be connected to GND potential and used for IC test. 5 RES2 INPUT Reserved pin. Must be connected to GND potential and used for IC test. 6 RES3 INPUT Reserved pin. Must be connected to GND potential and used for IC test. 7 Ilim OUTPUT Current Limit Pin. This pin provides the reference, based on the internal band-gap voltage reference, to limit the over current, across internal NMosFet. A 0.1% tolerance resistor shall be used to get the highest accuracy of the Over Current Limit. 8 EN INPUT Enable Pin. In combination with DIR, the internal NMOSes are turned on if Battery is applied on the IN pins. (See logic table) In enable mode, the internal Over-Current protection is activated from IN to VBUS. When enable mode is disabled, the NCP374 current consumption, into IN pin, is drastically decreased to limit current leakage of the self powered devices. 9 DIR INPUT Direct Mode pin. This pin can be used, in combination with Enable pin, for the front end protection applications like wireless devices. In this case, the part can be used as +/- OVP only. See logic table. 10 FLAG OUTPUT Fault indication pin. This pin allows an external system to detect fault condition. The FLAG pin goes low when input voltage exceeds OVLO threshold or drops below UVLO threshold (charging mode), charge current from IN to VBus exceeds current limit or internal temperature exceeds thermal shutdown limit. Since the FLAG pin is open drain functionality, an external pull up resistor to VBat must be added (10 kW minimum value). 11 IN POWER IN pin. In Front end application this pin is connected to charger device input or PMIC input. In host application, this pin is connected to upstream DCDC. This pin is used as power supply of the core and current from IN to VBUS is then limited to the external 12 NC NA 13 PAD1 POWER Description Not internally connected. Can be connected to any potential. Drain connection of the back to back MOSFET's. This exposed pad mustn't be connected to any other potential and must be used for thermal dissipation of the internal MOSFETs. http://onsemi.com 4 NCP374 MAXIMUM RATINGS Rating Symbol Value Unit VminVBUS -30 V Vmin -0.3 V VmaxVBUS 30 V VmaxIN 10 V Vmax 7 V 2 900 A mA RqJA 80 C/W Operating Ambient Temperature Range TA -40 to +85 C Storage Temperature Range Tstg -65 to +150 C TJ 150 C MSL Level 1 Minimum Voltage (VBus to GND) Minimum Voltage (All others to GND) Maximum Voltage (Vbus to GND) Maximum Voltage (IN to GND) Maximum Voltage (All others to GND) Maximum DC current NCP374MU075TXG Charge Mode Vbus Mode I in Thermal Resistance, Junction to Air, (Note 1) Junction Operating temperature Moisture Sensitivity Stresses exceeding Maximum Ratings may damage the device. Maximum Ratings are stress ratings only. Functional operation above the Recommended Operating Conditions is not implied. Extended exposure to stresses above the Recommended Operating Conditions may affect device reliability. 1. The RqJA is highly dependent on the PCB heat sink area (connected to PAD1). See PCB recommendation paragraph. ELECTRICAL CHARACTERISTICS Min / Max limits values (-40C < TA < +85C) and IN = +5 V (Unless otherwise noted). Typical values are TA = +25C Characteristics Symbols Input Voltage Range Vin Vbus Voltage Range Vvbus Conditions Min Typ 2.5 All modes Max Unit 5.5 V 28 V -28 V All modes IN = 5 V -23 V Under Voltage Lockout Threshold UVLO Vbus falls down UVLO threshold Disable, Charge mode and Enhance Modes 2.6 2.7 2.8 V Under Voltage Lockout Hysteresis UVLOhyst Vbus rises up UVLO threshold + UVLOhyst 45 60 75 mV OVLO Vbus rises up OVLO threshold 5.6 5.77 5.9 V 45 65 90 mV Over voltage Lockout threshold Over Voltage Lockout Hysteresis OVLOhyst Vbus falls down to OVLO - OVLOhyst Vbus versus IN Resistance IN versus Vbus Resistance RDson Vbus = 5 V, or IN = 5 V NCP374MU075TXG 25C 85C Quiescent Current IddIN Standby Current Current limit NOTE: mW 90 140 155 No load. Vbus mode, Vin = 5 V 200 315 mA IddSTD No load, IN = 5 V. Standby mode, No Vbus 0.02 1 mA IOCP IN = 5 V, Load on Vbus, Vbus mode RILIM = 0 W NCP374MU075TXG Electrical parameters are guaranteed by correlation across the full range of temperature. http://onsemi.com 5 mA 600 750 900 NCP374 ELECTRICAL CHARACTERISTICS Min / Max limits values (-40C < TA < +85C) and IN = +5 V (Unless otherwise noted). Typical values are TA = +25C Characteristics FLAG Output Low Voltage FLAG Leakage Current Symbols Conditions Volflag Fault mode Sink 1 mA on FLAG pin FLAGleak FLAG level = 5.5 V DIR Voltage High Vih DIR Voltage Low Vol DIR Leakage Current Vih EN Voltage Low Vol EN Leakage Current Thermal Shutdown temperature Thermal Shutdown Hysteresis Typ Max Unit 400 mV 1 nA 1.2 V 0.4 DIRleak EN Voltage High Min DIR = 5.5 V 300 nA 1.2 V 0.4 ENleak EN = 5.5 V V V 300 nA TSD 150 C TSDHYST 30 C TIMINGS Vbus Mode TonVbus IN >= 2.5 V, from EN = 1.2 to 0.4 to Vbus >= 0.3 V Vbus Mode 0.6 1.2 1.8 ms Tstartvbus From IN >= 0.3 V FLAG = 1.2 V, Vbus Mode 0.6 1.2 1.8 ms Rearming Delay tRRD IN > .2.5 V, Rin = 1 W Vbus Mode, after fault 15 30 45 ms Over Current Regulation Time treg IN > 2.6, Vbus > 0.3 V Vbus Mode 0.5 1.2 1.8 ms OCP delay time tOCP From I Vbus > Ilim, 1 A/1 ms 5 ms TVbusDIS From EN = 0.4 V to 1.2 V, to Vbus < 0.3 V. IN = 5 V 165 ms toff From IN > OVLO toVbus 0.3 V Vin increasing from 5V to 8V at 3 V/ms 1.5 5 ms ton From Vbus>UVLO to IN=0.3V , charging mode 15 30 45 ms tstart From IN > 0.3 V to FLAG = 1.2 V 15 30 45 ms toff From Vbus > OVLO to IN 0.3 V Vin increasing from 5 V to 8 V at 3 V/ms 1.5 5 ms tstop From Vbus > OVLO to FLAG 0.4 V See Figures 3 and 9 Vin increasing from 5 V to 8 V at 3 V/ms 1.5 ms tdis EN = 1.2 V, From DIR = 0.4 to 1.2 V to IN 0.3 V 2.5 ms Start Up Delay FLAG going up Delay Vbus Disable time Turn off delay Charging Mode Start Up Delay FLAG going up Delay Turn off delay Alert delay Disable time NOTE: Electrical parameters are guaranteed by correlation across the full range of temperature. http://onsemi.com 6 NCP374 TYPICAL OPERATING CHARACTERISTICS Operation Over-Current Protection (OCP) The NCP374 acts as an over-voltage in charge mode, when wall adapter or Vbus cable is connected to Vbus pin of the device. The downstream system (transceiver, CCCV charger..) are protected up to +30 V if charging voltage exceeds OVLO threshold (5.77 V). Due to a back to back architecture, the Vbus pin is also protected against reverse polarity connection, coming from wrong USB cables. This negative protection acts down to -30 V. In disable mode (EN = 1, DIR = 1), there is no current consumption on IN pin and MSOFETs are turned off (Vbus cable disconnected) The NCP374 provides over-current from IN to Vbus by selecting Vbus mode. To active Vbus mode (USB port on), the EN pin must be tied low. In this case, MOSFET are turned on and current is measure in the branch. If the sinking current on the Vbus pin is above the programmed current on Ilim pin (can be programmed up to TBD), the Vbus current is regulated around Iocp during treg time. If the overload is present at the end of this timer, the Mosfet are turned off and automatic rearming cycle is activated. With Treg/Trrd cycle until overload is present. This device integrates over current protection function, from IN to Vbus port. That means the current across the internal NMOS is regulated when the value, set by external Rlim resistor, exceeds Ilimit during an internal timer. An internal resistor is placed in series with the pin allowing to have a maximum OCP value when I lim pin is directly connected to GND. By adding external resistors in series with I lim and GND, the OCP value is decreased. The Rlim tolerance is important to keep a good accuracy. So a value between 0.1% and 1% won't have an impact on the OCP accuracy. Nevertheless, the higher Rlim value, the lower Over current protection accuracy. Indeed, the current is measured by a voltage comparator on a serial resistance. If this voltage drop comes very small, the offset of the internal comparator will have an impact on the accuracy. So a division by more than three times with Rlim will degrade drastically the overcurrent accuracy. The current limit calculation formula for the NCP374MU075TXG is: Over-voltage Lockout (OVLO) During over current event, NMOSes are opened and FLAG output is tied to low, allowing the mController to take into account the fault event and then disable reverse charge path. Rlim(W) + 22150Iocp * 29035 To protect the connected system on IN pins, from external over-voltage coming from USB connector or Wall Adapter, through Vbus pin , the device has a built-in over-voltage lock out (OVLO) circuit. During over-voltage condition, the output remains disabled until the input voltage exceeds OVLO (Vbus pin). The OVLO comparator is available in all modes. Additional OVLO thresholds ranging from OVLO can be manufactured. Please contact your ON Semiconductor representative for further information. FLAG output is tied to low until Vin is higher than OVLO. This circuit has a built-in hysteresis to provide noise immunity to transient conditions. VBus Mode To access to the Vbus mode, DIR pin must be tied to high (>1.2) and EN must be tied from high to low (< 0.4 V). In that case, the core of the NCP374 will be supplied by the IN, with a 2.5 V minimum voltage and 5.5V maximum voltage. In this state, OCP, OVLO and thermal modes are available. http://onsemi.com 7 NCP374 IN Vbus ton tstart /FLAG t REG IREV Ilim {} {} /EN t RRD ID Over Current in Vbu s Transciever /DIR Figure 4. Over Current Protection sequence In Vbus Mode, FLAG pin remains available, allowing the mcontroller to have a status regarding over-voltage condition, over-current condition or thermal shutdown condition. http://onsemi.com 8 NCP374 Vbus tON IN Battery output /FLAG /DIR /EN Transciever Transciever Downstream Vbu s connection Figure 5. FLAG Status in Vbus Mode Logic Inputs DIR pin disconnects IN pin from Vbus pin. DIR does not overdrive an OVLO or UVLO fault (FLAG status is still available). To enable Charge operation (Charge Mode), the DIR pin shall be forced to low and EN to high. A high level on the Table 1. TABLE SELECTION OF CHARGE MODES Protection DIR EN MODE OVP @ VBUS (+28 V, -28 V, OVLO 5.77 V) OCP (IN to VBUS) OCP (VBUS to IN) 0 0 NA NA NA NA 0 1 Charge Yes NA NA 1 0 VBUS Yes Yes NA 1 1 Disable Yes (out off) NA NA Negative Voltage and Reverse Current The thermal threshold has been set at 150C. FLAG is then tied to low to inform the MCU. As the thermal hysteresis is 30C, the MOSFET will be closed as soon the device temperature falls down to 120C. If the fault event is still present, the temperature increase one more time and engages the thermal shutdown one more time until fault event disappeared. The device protects the system connected on IN pin from negative voltage occurring on Vbus pin, down to -28 V. When a negative voltage occurs, the IN pins are disconnected from Vbus pins . This negative protection is available in all modes Thermal Shutdown Protection In case of internal overheating, the integrated thermal shutdown protection allows to open the internal MOSFET in order to instantaneously decrease the device temperature. http://onsemi.com 9 NCP374 PCB Recommendations In any case, the PAD1 shall be not connected to any other potential or GND than the isolated extra copper surface. The under PAD1 of the NCP374 package shall be connected to an isolated PCB area to increase the heat transfer if necessary for an application standpoint. ORDERING INFORMATION Device NCP374MU075TXG Marking NCP 374 Order Current Limit 750 mA Package Shipping LLGA12 4x4 mm (Pb-Free) 3000 / Tape & Reel For information on tape and reel specifications, including part orientation and tape sizes, please refer to our Tape and Reel Packaging Specifications Brochure, BRD8011/D. http://onsemi.com 10 NCP374 PACKAGE DIMENSIONS TLLGA12 4x4, 0.5P CASE 513AP ISSUE O A B D NOTES: 1. DIMENSIONING AND TOLERANCING PER ASME Y14.5M, 1994. 2. CONTROLLING DIMENSION: MILLIMETERS. 3. DIMENSION b APPLIES TO PLATED TERMINAL AND IS MEASURED BETWEEN 0.15 AND 0.25 MM FROM THE TERMINAL TIP. 4. COPLANARITY APPLIES TO THE EXPOSED PAD AS WELL AS THE TERMINALS. E PIN ONE REFERENCE 0.10 C 2X 2X CC CC 0.10 C DIM A A1 b b1 D D2 E E2 e L TOP VIEW 0.10 C RECOMMENDED SOLDERING FOOTPRINT* A 0.08 C NOTE 4 C A1 SIDE VIEW MILLIMETERS MIN MAX 0.50 0.60 0.00 0.05 0.20 0.30 0.35 REF 4.00 BSC 3.65 3.75 4.00 BSC 2.95 3.05 0.50 BSC 0.25 0.35 SEATING PLANE 3.80 PACKAGE OUTLINE 12X 0.49 D2 b1 1 6 3.06 4.30 1 E2 0.40 11X 0.30 0.50 PITCH DIMENSIONS: MILLIMETERS 12X L 12 7 12X e e/2 *For additional information on our Pb-Free strategy and soldering details, please download the ON Semiconductor Soldering and Mounting Techniques Reference Manual, SOLDERRM/D. b 0.10 C A B 0.05 C NOTE 3 BOTTOM VIEW ON Semiconductor and are registered trademarks of Semiconductor Components Industries, LLC (SCILLC). SCILLC reserves the right to make changes without further notice to any products herein. SCILLC makes no warranty, representation or guarantee regarding the suitability of its products for any particular purpose, nor does SCILLC assume any liability arising out of the application or use of any product or circuit, and specifically disclaims any and all liability, including without limitation special, consequential or incidental damages. "Typical" parameters which may be provided in SCILLC data sheets and/or specifications can and do vary in different applications and actual performance may vary over time. All operating parameters, including "Typicals" must be validated for each customer application by customer's technical experts. SCILLC does not convey any license under its patent rights nor the rights of others. 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