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| New Product SIP4282 Vishay Siliconix 1 A Slew Rate Controlled Load Switch in PPAK SC75-6 DESCRIPTION The SIP4282 is a P-Channel MOSFET power switch IC designed for high-side load switching applications. The output switching transistor is a P-Channel MOSFET device that has a 140 m RDS(ON) typically to increase load switching power handling capacity. The SIP4282 is available in two different versions with turn-on and turn-off characteristics ranging from very fast to slew rate limited. In addition to a fast turn-off time of 4 s, the SIP4282-3 version offers a shutdown load discharge circuit to instantaneously turn off a load circuit when the switch is disabled. The SIP4282 load switch operates with an input voltage ranging from 1.8 V to 5.5 V, making it ideal for both 3 V and 5 V systems. The SIP4282 also features an under-voltage lock out which turns the switch off when an input undervoltage condition exists. Input logic levels are TTL and 2.5 V to 5 V CMOS compatible. This device has a very low operating current (typically 2.5 A), making it ideal for battery-powered applications. In shutdown mode, the supply current decreases to less than 1 A. The SIP4282 is available in a lead (Pb)-free 6 pin PPAK SC75-6 package and is specified over - 40 C to 85 C temperature range. FEATURES * 1.8 V to 5.5 V Input Voltage range * Very Low RDS(ON), typically 140 m at 5 V and 175 m at 3 V * Slew rate limited turn-on time options - SIP4282-1: 1 ms - SIP4282-3: 100 s * Fast shutdown load discharge option * Low quiescent current, typically 2.5 A * Low Shutdown Current < 1 A * TTL/CMOS input logic level * UVLO of 1.4 V * SC-75 Package APPLICATIONS * * * * * * Cellular telephones Digital still cameras Personal digital assistants (PDA) Hot swap supplies Notebook computers Personal communication devices * USB TYPICAL APPLICATION CIRCUIT VIN 1 2 VIN VIN OUT OUT 6 5 VOUT SIP4282 C IN 1 F ON/OFF 4 ON/OFF GND 3 C OUT 0.1 F GND GND SIP4282 Typical Application Circuit Document Number: 73851 S-70069-Rev. C, 22-Jan-07 www.vishay.com 1 New Product SIP4282 Vishay Siliconix ABSOLUTE MAXIMUM RATINGS Parameter Supply Input Voltage (VIN) Enable Input Voltage (VON) Output Voltage (VOUT) Maximum Continuous Switch Current (IMAX) Maximum Pulsed Current (IDM) VIN ESD Rating (HBM) Junction Temperature (TJ) Thermal Resistance (JA)a Power Dissipation (PD )b 6 pin PPAK SC75 6 pin PPAK SC75 VIN 2.5 V VIN < 2.5 V Limit - 0.3 to 6 - 0.3 to 6 - 0.3 to VIN + 0.3 1.2 3 1.6 4000 - 40 to 150 90 610 V C C/W mW A V Unit Notes: a. Device mounted with all leads and power pad soldered or welded to PC board. b. Derate 11.1 mW/C above TA = 70 C. Stresses beyond those listed under "Absolute Maximum Ratings" may cause permanent damage to the device. These are stress ratings only, and functional operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to absolute maximum rating/conditions for extended periods may affect device reliability. RECOMMENDED OPERATING RANGE Parameter Input Voltage Range (VIN) Operating Temperature Range Limit 1.8 to 5.5 - 40 to 85 Unit V C SPECIFICATIONS Test Conditions Unless Specified VIN = 5.0, TA = - 40 C to 85 C (Typical values are at TA = 25 C) Limits - 40 C to 85 C Mina 1.8 1.0 2 2.4 Typb 1.4 250 2.5 140 150 175 300 2800 20 1000 4 Maxa 5.5 1.8 4 1 1 230 250 290 480 0.8 1 40 1500 10 s A ppm/C V m Unit Parameter SIP4282 All Versions Operating Voltagec Under Voltage Lockout Under Voltage Lockout Hysteresis Quiescent Current Off Suply Current Off Switch Current Symbol VIN VUVLO VUVLO(hyh) IQ IQ(OFF) ISD(OFF) VIN Falling ON/OFF = active ON/OFF = inactive, OUT = open ON/OFF = inactive, VOUT = 0 VIN = 5 V, TA = 25 C VIN = 4.2 V, TA = 25 C VIN = 3 V, TA = 25 C VIN = 1.8 V, TA = 25 C V mV A On-Resistance RDS(on) On-Resistance Temp-Coefficient ON/OFF Input Low Voltage ON/OFF Input High Voltage ON/OFF Input Leakage SIP4282-1 Version Output Turn-On Delay Time Output Turn-On Rise Time Output Turn-Off Delay Time TCRDS VIL VIH ISINK TD(ON) T(ON) TD(OFF) VIN = 2.7 V to 5.5 Vd VIN = 2.7 V to 4.2 V VIN > 4.2 V to 5.5 V VON/OFF = 5.5 V VIN = 5 V, RLOAD = 10 , TA = 25 C VIN = 5 V, RLOAD = 10 , TA = 25 C VIN = 5 V, RLOAD = 10 , TA = 25 C www.vishay.com 2 Document Number: 73851 S-70069-Rev. C, 22-Jan-07 New Product SIP4282 Vishay Siliconix SPECIFICATIONS Test Conditions Unless Specified VIN = 5.0, TA = - 40 C to 85 C (Typical values are at TA = 25 C) VIN = 5 V, RLOAD = 10 , TA = 25 C VIN = 5 V, RLOAD = 10 , TA = 25 C VIN = 5 V, RLOAD = 10 , TA = 25 C ON/OFF = Inactive, TA = 25 C Limits - 40 C to 85 C Mina Typb 20 100 4 150 Maxa 40 150 10 250 s Unit Parameter SIP4282-3 Version Output Turn-On Delay Time Output Turn-On Rise Time Output Turn-Off Delay Time Output Pull-Down Resistance Symbol TD(ON) T(ON) TD(OFF) RPD Notes: a) The algebriac convention whereby the most negative value is a minimum and the most positive a maximum. b) Typical values are for DESIGN AID ONLY, not guaranteed nor subject to production testing c) Part requires minimum start-up of VIN 2.0 V to ensure operation down to 1.8 V. d) For VIN outside this range consult typical ON/OFF threshold curve. PIN CONFIGURATION OUT 6 1 VIN OUT 5 2 VIN ON/OFF 4 3 GND Bottom View PPAK SC75-6 Package PIN DESCRIPTION Pin Number PPAK SC75-6 1, 2 3 4 5, 6 Name VIN GND ON/OFF OUT Function This pin is the P-Channel MOSFET source connection. Bypass to ground through a 1 F capacitor. Ground Connection Enable Input This pin is the P-Channel MOSFET drain connection. Bypass to ground through a 0.1 F capacitor. SELECTION GUIDE Part Number SIP4282-1-T1-E3 SIP4282-3-T1-E3 Slew Rate (typ) 1 ms 100 s Active Pull Down No Yes Enable Active high Active high ORDERING INFORMATION Part Number SIP4282DVP-1-T1-E3 SIP4282DVP-3-T1-E3 Notes: XXX = Lot Code Marking L7XXX L9XXX Temperature Range - 40 C to 85 C Package PPAK SC75-6 PPAK SC75-6 Document Number: 73851 S-70069-Rev. C, 22-Jan-07 www.vishay.com 3 New Product SIP4282 Vishay Siliconix TYPICAL CHARACTERISTICS internally regulated, 25 C, unless otherwise noted 3.5 3 Quiescent Current (A) 2.5 2 1.5 1 0.5 0 1 2 3 VIN (V) 4 5 6 3.5 3 VIN = 5 V Quiescent Current (A) 2.5 2 1.5 VIN = 3 V 1 0.5 0 - 40 - 15 10 35 60 85 Temperature (C) Quiescent Current vs. Input Voltage 250 ILOAD = 500 mA 200 VIN = 3 V rDS(ON) (m) 150 350 V IN = 5 V 100 300 250 50 200 150 0 - 40 - 15 10 35 60 85 Temperature (C) 100 1.5 2 500 mA 550 500 1A 450 400 Quiescent Current vs. Temperature 100 mA 2.5 3 3.5 VIN (V) 4 4.5 5 5.5 RDS(ON) vs. Temperature 100 2.2 2 80 ON/OFF Threshold (V) IoffSwitch (nA) 1.8 1.6 1.4 1.2 RDS(ON) vs. Input Voltage 60 VIH 40 VIL 1 0.8 0.6 20 0 - 40 - 15 10 35 60 85 Temperature (C) 0.4 1.5 2 2.5 3 3.5 VIN (V) 4 4.5 5 5.5 Off Switch Current vs. Temperature ON/OFF Threshold vs. Input Voltage www.vishay.com 4 Document Number: 73851 S-70069-Rev. C, 22-Jan-07 New Product SIP4282 Vishay Siliconix TYPICAL WAVEFORMS ON/OFF (5 V/div.) VOUT (2 V/div.) IIN (200 mA/div.) Time (5 s/div) SIP4282-1 Turn-On (VIN = 3 V, RLOAD = 6 ) SIP4282-1 Turn-Off (VIN = 3 V, RLOAD = 6 ) ON/OFF (5 V/div.) ON/OFF (5 V/div.) VOUT (2 V/div.) VOUT (2 V/div.) IIN (200 mA/div.) IIN (200 mA/div.) Time (500 s/div) Time (5 s/div) SIP4282-1 Turn-On (VIN = 5 V, RLOAD = 10 ) SIP4282-1 Turn-Off (VIN = 5 V, RLOAD = 10 ) Document Number: 73851 S-70069-Rev. C, 22-Jan-07 www.vishay.com 5 New Product SIP4282 Vishay Siliconix TYPICAL WAVEFORMS ON/OFF (5 V/div.) ON/OFF (5 V/div.) (2 V/div.) (2 V/div.) (200 mA/div.) (200 mA/div.) Time (50 s/div) Time (5 s/div) SIP4282-3 Turn-On (VIN = 3 V, RLOAD = 6 ) SIP4282-3 Turn-Off (VIN = 3 V, RLOAD = 6 ) ON/OFF (5 V/div.) ON/OFF (5 V/div.) (2 V/div.) (2 V/div.) (200 mA/div.) (200 mA/div.) Time (50 s/div) Time (5 s/div) SIP4282-3 Turn-On (VIN = 5 V, RLOAD = 10 ) SIP4282-3 Turn-Off (VIN = 5 V, RLOAD = 10 ) www.vishay.com 6 Document Number: 73851 S-70069-Rev. C, 22-Jan-07 New Product SIP4282 Vishay Siliconix BLOCK DIAGRAM VIN OUT Under Voltage Lockout Level Shift Turn-On Slew Rate Control ON/OFF GND SIP4282-3 version only SIP4282 Functional Block Diagram DETAILED DESCRIPTION The SIP4282 is a P-Channel MOSFET power switches designed for high-side slew rate controlled load-switching applications. Once turned on, the slew-rate control circuitry is activated and current is ramped in a linear fashion until it reaches the level required for the output load condition. This is accomplished by first elevating the gate voltage of the MOSFET up to its threshold voltage and then by linearly increasing the gate voltage until the MOSFET becomes fully enhanced. At this point, the gate voltage is then quickly increased to the full input voltage to reduce RDS(ON) of the MOSFET switch and minimize any associated power losses. The SIP4282-1 version has a modest 1 ms turn on slew rate feature, which significantly reduces in-rush current at turned on time and permits the load switch to be implemented with a small input capacitor, or no input capacitor at all, saving cost and space. In addition to a 100 s minimized slew rate, the SIP4282-3 features a shutdown output discharge circuit which is activated at shutdown (when the part is disabled through the ON/OFF pin) and discharges the output pin through a small internal resistor hence, turning off the load. In instances where the input voltage falls below 1.4 V (typically) the under voltage lock-out circuitry protects the MOSFET switch from entering the saturation region or operation by shutting down the chip. APPLICATION INFORMATION Input Capacitor While a bypass capacitor on the input is not required, a 1 F or larger capacitor for CIN is recommended in almost all applications. The Bypass capacitor should be placed as physically close as possible to the SIP4282 to be effective in minimizing transients on the input. Ceramic capacitors are recommended over tantalum because of their ability to withstand input current surges from low impedance sources such as batteries in portable devices. Output Capacitor A 0.1 F capacitor or larger across VOUT and GND is recommended to insure proper slew operation. COUT may be increased without limit to accommodate any load transient condition with only minimal affect on the SIP4282 turn on slew rate time. There are no ESR or capacitor type requirement. Enable The ON/OFF pin is compatible with both TTL and CMOS logic voltage levels. Document Number: 73851 S-70069-Rev. C, 22-Jan-07 www.vishay.com 7 New Product SIP4282 Vishay Siliconix Protection Against Reverse Voltage Condition The P-channel MOSFET pass transistor has an intrinsic diode that is reversed biased when the input voltage is greater than the output voltage. Should VOUT exceed VIN, this intrinsic diode will become forward biased and allow excessive current to flow into the IC thru the VOUT pin and potentially damage the IC device. Therefore extreme care should be taken to prevent VOUT from exceeding VIN. In conditions where VOUT exceeds VIN a Schottky diode in parallel with the internal intrinsic diode is recommended to protect the SIP4282. Thermal Considerations The SIP4282 is designed to maintain a constant output load current. Due to physical limitations of the layout and assembly of the device the maximum switch current is 1.2 A, as stated in the ABS MAX table. However, another limiting characteristic for the safe operating load current is the thermal power dissipation of the package. To obtain the highest power dissipation (and a thermal resistance of 90 C/W) the power pad of the device should be connected to a heat sink on the printed circuit board. The maximum power dissipation in any application is dependant on the maximum junction temperature, TJ(MAX) = 125 C, the junction-to-ambient thermal resistance for the SC-75 PPAK package, J-A = 90 C/W, and the ambient temperature, TA, which may be formulaically expressed as: P (max) = T J (max) - T A J-A = 125 - T A 90 It then follows that, assuming an ambient temperature of 70 C, the maximum power dissipation will be limited to about 610 mW. So long as the load current is below the 1.2 A limit, the maximum continuous switch current becomes a function two things: the package power dissipation and the RDS(ON) at the ambient temperature. As an example let us calculate the worst case maximum load current at TA = 70 C. The worst case RDS(ON) at 25 C occurs at an input voltage of 1.8 V and is equal to 480 m. The RDS(ON) at 70 C can be extrapolated from this data using the following formula RDS(ON) (at 70 C) = RDS(ON) (at 25 C) x (1 + TC x T) Where TC is 3300 ppm/C. Continuing with the calculation we have RDS(ON) (at 70 C) = 480 m x (1 + 0.0033 x (70 C - 25 C)) = 551 m The maximum current limit is then determined by P (max) I LOAD (max) R DS(ON ) which in case is 1.05 A. Under the stated input voltage condition, if the 1.05 A current limit is exceeded the internal die temperature will rise and eventually, possibly damage the device. Vishay Siliconix maintains worldwide manufacturing capability. Products may be manufactured at one of several qualified locations. Reliability data for Silicon Technology and Package Reliability represent a composite of all qualified locations. For related documents such as package/tape drawings, part marking, and reliability data, see http://www.vishay.com/ppg?73851. www.vishay.com 8 Document Number: 73851 S-70069-Rev. C, 22-Jan-07 Legal Disclaimer Notice Vishay Notice Specifications of the products displayed herein are subject to change without notice. Vishay Intertechnology, Inc., or anyone on its behalf, assumes no responsibility or liability for any errors or inaccuracies. Information contained herein is intended to provide a product description only. No license, express or implied, by estoppel or otherwise, to any intellectual property rights is granted by this document. Except as provided in Vishay's terms and conditions of sale for such products, Vishay assumes no liability whatsoever, and disclaims any express or implied warranty, relating to sale and/or use of Vishay products including liability or warranties relating to fitness for a particular purpose, merchantability, or infringement of any patent, copyright, or other intellectual property right. The products shown herein are not designed for use in medical, life-saving, or life-sustaining applications. Customers using or selling these products for use in such applications do so at their own risk and agree to fully indemnify Vishay for any damages resulting from such improper use or sale. Document Number: 91000 Revision: 08-Apr-05 www.vishay.com 1 |
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