SiP4612A/B Vishay Siliconix Protected 1-A High-Side Load Switch DESCRIPTION FEATURES SiP4612A/B is a protected highside power switch. It is designed to operate from voltages ranging from 2.4 V to 5.5 V and handle a continuous current of 1 A. The user settable current limit protects the input supply voltage from excessive load currents that might cause a system failure. SiP4612A/B has a low quiescent current of 11 µA and in shutdown the supply current is reduced to less than 1 µA. In addition to current limit, the SiP4612A/B is protected by undervoltage lockout and thermal shutdown. • 1 A continuous output current The SiP4612A/B is available in a lead (Pb)-free 6-pin PowerPAK® TSC75-6 for operation over the industrial temperature range of - 40 °C to 85 °C. APPLICATIONS • 2.4 V to 5.5 V supply voltage range RoHS • User settable current limit level COMPLIANT • Low quiescent current • Undervoltage lockout • Thermal shutdown protection • 4 kV ESD Rating-HBM • Peripheral ports • Hot swap • Notebook computers • PDAs TYPICAL APPLICATION CIRCUIT IN 2.4 to 5.5 V 1 µF Enable CIN OUT Load SiP4612A/B ON/ON COUT 0.47 µF SET GND RSET GND Document Number: 74481 S-80971-Rev. B, 24-Apr-08 GND www.vishay.com 1 SiP4612A/B Vishay Siliconix ABSOLUTE MAXIMUM RATINGS all voltages referenced to GND = 0 V Parameter VIN, VON, VON IMAX Storage Temperature Operating Junction Temperature Limit Unit - 0.3 to 6 2 - 65 to 150 - 40 to 150 V A °C °C 420 mW 131 °C/W Power Dissipationa, PowerPAK TSC75-6 b Thermal Impedance (ΘJA) , PowerPAK TSC75-6 Notes: a. Derate 7.6 mW/°C above TA = 70 °C. b. Device mounted with all leads soldered or welded to PC board. 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 all voltages referenced to GND = 0 V Parameter IN Operating Temperature Range Limit Unit 2.4 to 5.5 - 40 to 85 V °C SPECIFICATIONSa Limits Test Conditions Unless Specified Parameter Symbol IN = 5 V, TA = - 40 to 85 °C Min.a Typ.b Max.a Unit 5.5 V Power Supplies Supply Voltage VIN Quiescent Current IQ 2.4 IN = 5 V, ON/ON = Active, lOUT = 0 A 11 25 Shutdown Current ISD IN = 5 V, ON/ON = Inactive 1 Switch Off Current IS(off) IN = 5 V, ON/ON = Inactive, VOUT = 0 V, TA = 25 °C 1 µA Enable Inputs ON/ON High VIH ON/ON Low VIL ON/ON Leakage Current ILH Turn Off Time tOFF Turn On Time tON IN = 2.4 V to 5.5 V 1.5 0.5 ON/ON = 5 V 1 0.5 5 55 120 IN = 5 V, TA = 25 °C, lOUT = 100 mA 150 225 IN = 3 V, TA = 25 °C, lOUT = 100 mA 180 250 0.5 0.625 IN = 5 V, RL = 10 Ω V µA µs Output On-Resistance Current Limit RDS IL RSET = 6.81 kΩ Minimum Current Limit IL(min) Current Limit Response Time tRESP IN = 5 V UVLO Threshold VUVLO Rising Edge UVLO Hysteresis VHYST 0.375 mΩ A 85 mA 4 µs Undervoltage Lockout 1.8 2.4 0.05 V Thermal Shutdown Thermal Shutdown Threshold Hysteresis T THYST 165 20 °C Notes: a. The algebraic convention whereby the most negative value is a minimum and the most positive a maximum (- 40 °C to 85 °C). b. Typical values are for DESIGN AID ONLY, not guaranteed nor subject to production testing. c. Guaranteed by design. www.vishay.com 2 Document Number: 74481 S-80971-Rev. B, 24-Apr-08 SiP4612A/B Vishay Siliconix PIN CONFIGURATION, ORDERING INFORMATION OUT IN IN OUT GND NC NC GND SET ON/ON ON/ON SET Bottom View Top View TSC75-6 Package ORDERING INFORMATION Parameter SiP4612ADVP-T1-E3 SiP4612BDVP-T1-E3 XX = Lot Code W = Work week Code Marking Temperature Range Package M1WXX M2WXX - 40 °C to 85 °C - 40 °C to 85 °C PowerPAK TSC75-6 PowerPAK TSC75-6 PIN DESCRIPTION Pin Number Name Function 1 2 3 OUT GND SET 4 ON/ON Switch output Ground pin Current limit level set pin. The level is determinied by the value of a resistor connected from this pin to GND Shutdown pin. ON/ON, active low on the SiP4612A to turn on the switch, active high to turn off SiP4612A Active high on the SiP4612B to turn on the switch, active low to turn off SiP4612B 5 6 NC IN No connection Input supply voltage and switch input FUNCTIONAL BLOCK DIAGRAM nW/L IN OUT + W/L Under Voltage Lockout Thermal Shutdown SET + - ON/ON Reference Voltage GND Figure 1. SiP4612A/B Block Diagram Document Number: 74481 S-80971-Rev. B, 24-Apr-08 www.vishay.com 3 SiP4612A/B Vishay Siliconix DETAILED DESCRIPTION The SiP4612A/B limits load current by sampling the pass transistor current and passing that through an external resistor, RSET. The voltage across RSET, VSET, is then compared with an internal reference voltage, VREF. In the event that load current surpasses the set limit current, VSET will exceed VREF causing the pass transistor gate voltage to increase, thereby reducing the gate to source voltage of the PMOS switch and regulating its current back down to ILIMIT. Setting the Current Limit Level Setting the current limit level on the SiP4612A/B requires some care to ensure the maximum current required by the load will not trigger the current limit circuitry. The minimum current limit threshold should be determined by taking the maximum current required by the load, ILOAD, and adding 25 % headroom. The SiP4612A/B has a current limit tolerance of 25 %, which is largely a result of process variations from part to part, and also temperature and VIN/VOUT variances. Thus, to ensure that the actual current limit is never below the desired current limit a 1/0.75 = 1.33 coefficient needs to be added to the calculations. Knowing the maximum load current required, the value of RSET is calculated as follows. RSET = RSET coefficient/ILIMIT where ILIMIT = (ILOAD x 1.33) x 1.25 and RSET coefficient is 3460 for a 500 mA current limit. For typical RSET coefficient values given a limit current refer to the "Typical Characteristics" section. Operation at Current Limit and Thermal Shutdown In the event that a load higher than ILIMIT is demanded of the SiP4612A/B, the load current will stay fixed at the current limit established by RSET. However, since the required current is not supplied, the voltage at OUT will drop. The increase in VIN - VOUT will cause the chip to dissipate more heat. The power dissipation for the SiP4612A/B can be expressed as P = ILOAD x (VIN - VOUT) Once this exceeds the maximum power dissipation of the package, the die temperature will rise. When the die temperature exceeds an over-temperature limit of 165 °C, the SiP4612A/B will shut down until it has cooled down to 145 °C, before starting up again. As can be seen in the figure below, the SiP4612A/B will continue to cycle on and off until the load is reduced or the part is turned off (See Figure 2). 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 TSC75-6 package, θJ-A = 131 °C/W, and the ambient temperature, TA, which may be formulaically expressed as: P (max) = TJ (max) − T A = θ J −A 125 − TA 131 It then follows that assuming an ambient temperature of 70 °C, the maximum power dissipation will be limited to about 419 mW. Reverse Voltage The SiP4612A/B is designed to control current flowing from IN to OUT. If the voltage on OUT is raised higher than IN current will flow from OUT to IN but the current limit function will not be available, as can be inferred from the block diagram in Figure 1. Thus, in applications were OUT is used to charge IN, careful considerations must be taken to limit current through the device and protect it from becoming damaged. RSET = 3.32 kΩ VOUT = (1 V/div) IOUT (500 mA/div) 20 ms/div Figure 2. Current Over load Condition. Load Switch turned on with 0.1 Ω load at time = 0 ms. www.vishay.com 4 Document Number: 74481 S-80971-Rev. B, 24-Apr-08 SiP4612A/B Vishay Siliconix TYPICAL CHARACTERISTICS 25 °C, unless otherwise noted 20 20 Quiescent Current (µA) Quiescent Current (µA) 16 12 8 15 10 5 4 0 - 40 0 - 20 0 20 40 60 80 100 120 0 1 2 5 6 Quiescent Current vs. Input Voltage 250 6 I OUT = 100 mA VOUT = 5 V, RSET = 6.81 kΩ 5 220 4 190 R DS(on) - (mΩ) VOUT (V) 4 VIN - Input Voltage (V) Temperature (°C) Quiescent Current vs. Temperature 3 VIN = 3 V 160 2 130 1 100 VOUT = 4.2 V, RSET = 4.32 kΩ 70 - 40 0 0 0.5 1 1.5 2 VIN = 5 V - 20 0 IOUT (A) 40 60 80 100 120 Temperature (°C) 10.0 1.0 1.0 Off Switch Current (µA) 10.0 0.1 0.1 0.01 0.01 0.001 - 40 20 RDS(on) vs. Temperature Output Current vs. VOUT Off Supply Current (µA) 3 - 20 0 20 40 60 80 100 Temperature (°C) Off Supply Current vs. Temperature Document Number: 74481 S-80971-Rev. B, 24-Apr-08 120 0.001 - 40 - 20 0 20 40 60 80 100 120 Temperature (°C) Off Switch Current vs. Temperature www.vishay.com 5 SiP4612A/B Vishay Siliconix TYPICAL CHARACTERISTICS 25 °C, unless otherwise noted 1.0 120 100 VIN = 3 V Turn-Off Time (µs) Turn-On Time (µS) 0.75 80 VIN = 5 V 60 40 VIN = 5 V 0.50 VIN = 3 V 0.25 20 0 - 40 - 20 0 20 40 60 80 0.0 - 40 100 - 20 0 20 40 60 Temperature (°C) Temperature (°C) Turn-On vs. Temperature RL = 10 Ω, CL = 0.47 µF Turn-Off vs. Temperature RL = 10 Ω, CL = 0.47 µF 1.01 80 100 100 1.00 0.99 0.97 RSET (kΩ) VIH and VIL (V) 0.98 0.96 0.95 VIH 10 VIL 0.94 0.93 0.92 0.91 2.5 3.0 3.5 4.0 4.5 5.0 5.5 1 0.1 6.0 1 ILIMIT (A) VIH and VIL vs. VIN RSET vs. ILIMIT 4 5 RSET = 8 kΩ VIN - VOUT = 0.5 V 3 2 4 Current Limit (%) RSET ILIMIT Product (kV) 10 VIN - Input Voltage (V) 3 1 0 -1 -2 -3 2 0.00 0.25 0.50 0.75 ILIMIT (A) RSET Coefficient vs. ILIMIT www.vishay.com 6 1.00 -4 - 40 - 20 0 20 40 60 80 100 120 Temperature (°C) Current Limit vs. Temperature Document Number: 74481 S-80971-Rev. B, 24-Apr-08 SiP4612A/B Vishay Siliconix TYPICAL CHARACTERISTICS 25 °C, unless otherwise noted 250 250 IIN = 500 mA VOUT = 5 V 200 R DS(on) - (mΩ) R DS(on) - (mΩ) 200 150 100 VOUT = 5 V 150 100 50 50 - 40 0 - 20 0 20 40 60 80 100 120 0 100 200 300 400 500 600 700 800 900 1000 Temperature (°C) lIN (mA) RDS(on)_reverse vs. Temperature RDS(VOUT-IN) vs. Current TYPICAL WAVEFORMS VOUT (1 V/div) VOUT (1 V/div) IOUT = 500 mA IOUT = 500 mA ON (1 V/div) ON (1 V/div) 20 µs/div 20 µs/div Turn On Turn Off VIN (1 V/div) VIN (1 V/div) IOUT = (2 A/div) IOUT = (2 A/div) VOUT (1 V/div) VOUT (1 V/div) 1 µs/div Short Circuit through 0.3 Ω, Vin = 3.3 V Document Number: 74481 S-80971-Rev. B, 24-Apr-08 1 µs/div Short Circuit through 0.3 Ω, Vin = 5 V www.vishay.com 7 SiP4612A/B Vishay Siliconix TYPICAL WAVEFORMS VOUT 500 mV/div VOUT IOUT IOUT 200 mA/div 100 µs/div Current Limit VIN = 3.7 V, RSET = 4.32 kΩ, IOUT: 100 mA to 800 mA 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?74481. www.vishay.com 8 Document Number: 74481 S-80971-Rev. B, 24-Apr-08 Package Information Vishay Siliconix PowerPAK ® TSC75-6L (Power IC only) D1 Exposed pad e b D Pin4 Pin 5 Pin6 K E PPAK TSC75 (1.6 x 1.6 mm) E1 Exposed pad K L Pin3 Pin 2 Pin1 e1 K2 Pin 1 Dot By Marking K2 Top View Bottom View A C A1 Side View MILLIMETERS INCHES DIM Min Nom Max Min Nom Max A 0.50 0.55 0.65 0.020 0.022 0.026 A1 0 - 0.05 0 - 0.002 b 0.20 0.25 0.30 0.008 0.010 0.012 C 0.10 0.15 0.20 0.006 0.008 0.010 D 1.55 1.60 1.65 0.0061 0.063 0.065 D1 0.95 1.00 1.05 0.037 0.039 0.041 E 1.55 1.60 1.65 0.061 0.063 0.065 E1 0.55 0.60 0.65 0.022 0.024 0.026 e 0.50 BSC e1 0.020 BSC 1.00 BSC 0.039 BSC K 0.15 - - 0.006 K2 0.20 - - 0.008 L 0.20 0.25 0.30 0.008 - - 0.010 0.012 ECN: S-61919-Rev. A, 02-Oct-06 DWG: 5955 Document Number: 74416 02-Oct-06 www.vishay.com 1 Legal Disclaimer Notice Vishay Disclaimer ALL PRODUCT, PRODUCT SPECIFICATIONS AND DATA ARE SUBJECT TO CHANGE WITHOUT NOTICE TO IMPROVE RELIABILITY, FUNCTION OR DESIGN OR OTHERWISE. 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No license, express or implied, by estoppel or otherwise, to any intellectual property rights is granted by this document or by any conduct of Vishay. Product names and markings noted herein may be trademarks of their respective owners. Document Number: 91000 Revision: 11-Mar-11 www.vishay.com 1