CAT6500 3.0 A Power Selector Switch Description CAT6500 is an automatic power switch designed to select between two power sources and direct that power to a load for battery charging or system power. CAT6500's power inputs withstand voltages of up to 18 V and protect the downstream load from voltages exceeding 7 V. In the event of a polarity reversal at either input CAT6500's internal power switches will shut off to prevent discharge of the system's internal power source. Low resistance power switches handle currents in excess of 3 A and when OFF block current flow in both directions. CAT6500 can operate in reverse mode in which internal system power is be directed to either of the power input ports for powering an external device, such as a USB On-The-Go appliance. http://onsemi.com 1 WQFN-32 HVA SUFFIX CASE 485BN MARKING DIAGRAM Features * * * * * * * * Autonomous Switching between 2 Power Sources Withstands +18 V to -5 V on Either Power Input 80 mW Switches (typ.) for Low Power Loss Reverse-Mode for Powering External Devices Over Voltage Protection of Downstream Load Compatible with USB-OTG Devices 32-Lead WQFN 4.4 mm x 4.4 mm Package This Device is Pb-Free, Halogen Free/BFR Free and is RoHS Compliant 6500 SSSS ALYW G 6500 SSSS A L Y W G = Specific Device Code = Last Four Digits of Assembly Lot Number = Assembly Location = Wafer Lot Number (optional) = Production Year = Production Week = Pb-Free Package Typical Applications * Mobile Phones * PDAs * Personal Navigation Devices PWR_OUT PS1 SW1_STAT PS2 CAT6500 VCC ORDERING INFORMATION Device CAT6500HVA-T2 Power Management IC or Battery Charge SW2_STAT + RM_EN1 - Package Shipping WQFN-32 (Pb-Free) 2,000/ Tape & Reel For information on tape and reel specifications, including part orientation and tape sizes, please refer to our Tape and Reel Packaging Specification Brochure, BRD8011/D. Li-Ion RM_EN2 0.1 mF PRIORITY C1 Figure 1. Typical Application Circuit (c) Semiconductor Components Industries, LLC, 2011 August, 2011 - Rev. 1 1 Publication Order Number: CAT6500/D CAT6500 PS1 Detect - + - + OVP Detect - + SW1 150 mV PS1 PWR_OUT SW1_STAT 1.7 V PWR_OUT 7V Level Shifter VCC C1 PRIORITY Voltage Source Selection Charge Pump Thermal Shutdown V Ref Control Logic Level Shifter SW2 PS2 - + - + - + OVP Detect PS2 Detect GND Figure 2. Simplified Block Diagram PS1 PS1 PS1 PS1 NIC PWR_OUT PWR_OUT PWR_OUT PIN CONNECTIONS 32 1 PWR_OUT PS1 PWR_OUT PWR_OUT SW1_STAT 36 SW2_STAT PWR_OUT PWR_OUT PS1 PS2 GND GND or Floating 34 PS2 RM_EN1 35 33 NIC PS2 RM_EN2 PRIORITY NIC NIC C1 GND NIC VCC NIC PS2 PS2 PS2 (Top View) Figure 3. Pin Connections w/Rear Pads Shown http://onsemi.com 2 RM_EN2 SW2_STAT 7V 1.7 V 150 mV RM_EN1 CAT6500 Table 1. PIN FUNCTION DESCRIPTION Pin No. Pin Name Description 1, 2, 3, 4 PWR_OUT 5 NIC No Internal Connection. A signal or voltage applied to this pin will have no effect on device operation. 6, 7, 8, 9, 10 PS2 Power Source #2. External power input 11, 12 NIC No Internal Connection. A signal or voltage applied to this pin will have no effect on device operation. 13 VCC Power input from battery. 14 GND Ground. Reference point for all voltages. 15 C1 Filter capacitor for CAT6500's internal power bus 16 NIC No Internal Connection. A signal or voltage applied to this pin will have no effect on device operation. 17 NIC No Internal Connection. A signal or voltage applied to this pin will have no effect on device operation. 18 PRIORITY 19 RM_EN2 20 GND 21 RM_EN1 22 PS1 23 SW2_STAT Power Source 2 Status. An open drain LOW true logic level output indicating that the switch SW2 is turned on. 24 SW1_STAT Power Source 1 Status. An open drain LOW true logic level output indicating that the switch SW1 is turned on. 25, 26, 27, 28 PS1 Power Source #1. External power input. 29 NIC No Internal Connection. A signal or voltage applied to this pin will have no effect on device operation. 30, 31, 32 PWR_OUT Power Output. Must be tied to PWR_OUT on opposite side of chip. Use all 3 pins each side. 33 PWR_OUT Electrically active thermal pad. Does not need to be connected to other PWR_OUTs. Can be left floating but must not be connected to other signal paths or Ground. 34 PS2 Electrically active thermal pad. Does not need to be connected to other PS2 pins. Can be left floating but must not be connected to other signal paths or Ground. 35 - Mechanical support for control IC. This chip does not generate any significant heat and does not need a separate heat sinking connection. Electrically this may be left floating or can be grounded. It should NOT be connected to other signals or voltages. 36 PS1 Electrically active thermal pad. Does not need to be connected to other PS1 pins. Can be left floating but must not be connected to other signal paths or Ground. Power Output. Must be tied to PWR_OUT on opposite side of chip. Use all 3 pins each side. Priority selects preferred power source when both PS1 and PS2 are powered. Reverse Mode Enable 2. Overrides PRIORITY and turns SW2 ON. Ground. Reference point for all voltages. Reverse Mode Enable 1. Overrides PRIORITY and turns SW1 ON. Power Source #1. External power input. http://onsemi.com 3 CAT6500 Table 2. ABSOLUTE MAXIMUM RATINGS Parameter Symbol Pin Range Unit VPS PS1, PS2 -5.0 to 18 V VCC, VPWR_OUT VCC, C1, PWR_OUT -0.3 to 6.0 VL_IN RM_ENx, PRIORITY -0.3 to 6.0 V Control Logic Output Range VL_OUT SW1_STAT, SW2_STAT -0.3 to 6.0 V Maximum Junction Temperature TJ(max) - 150 C TSTG - -65 to 150 C ESD Capability, Human Body Model (Note 2) ESDHBM ALL 2 kV ESD Capability, Machine Model (Note 2) ESDMM ALL 200 V TSLD ALL 260 C Input Voltage Range (Note 1) Control Logic Input Range Storage Temperature Range Lead Temperature Soldering Reflow (SMD Styles Only), Pb-Free Versions (Note 3) 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. Refer to ELECTRICAL CHARACTERISTICS and APPLICATION INFORMATION for Safe Operating Area. 2. This device series incorporates ESD protection and is tested by the following methods: ESD Human Body Model tested per AEC-Q100-002 (EIA/JESD22-A114) ESD Machine Model tested per AEC-Q100-003 (EIA/JESD22-A115) Latchup Current Maximum Rating: 150 mA per JEDEC standard: JESD78 3. For information, please refer to our Soldering and Mounting Techniques Reference Manual, SOLDERRM/D Table 3. THERMAL CHARACTERISTICS (Note 4) Symbol Parameter Thermal Characteristics, TDFN-32 4.4 x 4.4 mm Thermal Resistance, Junction-to-Air, 1 sq. Inch, 1 oz. Copper Clad PCB Thermal Resistance, Junction-to-Air, 1 sq. Inch, 2 oz. Copper Clad PCB Value Unit C/W RJA 59 54 4. Values based on copper area of 645 mm2 (or 1 in2) of 1 oz copper thickness and FR4 PCB substrate. Table 4. RECOMMENDED OPERATING CONDITIONS Parameter Input Voltage PS1, PS2 Output Current Control Logic; Inputs and Outputs Ambient Temperature Symbol Min Max Unit VCC 1.6 5.5 V VPWR_OUT 0 5.5 VPS1, VPS2 -5 7.7 IPWR_OUT 0 3.3 A VL_IN, VL_OUT 0 5.5 V TA -40 +85 C http://onsemi.com 4 CAT6500 Table 5. ELECTRICAL OPERATING CHARACTERISTICS (VCC = 3.9 V, C1 = 0.1 mF, unless otherwise noted. Typical values TA = 25C, Min/Max values TA = -40C to +85C.) Test Conditions Symbol Min Typ Max Unit VPS 1.6 3.9 7.7 V PS1 or PS2 overvoltage protection mode VPS 1.6 3.9 12 VCC VCC 2.5 3.9 5.5 Operating Current; SW1 and SW2 ON Measured at VCC RM_EN1 = 1, RM_EN2 = 1 1.7 V < PS1 < 2.4 V, 1.7 V < PS2 < 2.4 V IVCC - 85 120 mA Quiescent Current; SW1 and SW2 OFF Measured at VCC PRIORITY = 1, RM_EN1 = 0, RM_EN2 = 0 PS1 < 1.5 V, PS2 < 1.5 V IVCC - 35 45 mA Input Voltage Detect PS1, PS2, voltage rising VDETR 1.6 1.7 1.8 V PS1, PS2, voltage falling VDETF 0.1 0.15 0.3 Over Voltage Detection PS1, PS2, voltage rising VOVP 6.5 7.0 7.8 V Over Voltage Hysteresis PS1, PS2, voltage falling VHYS 100 - 250 mV Reverse Voltage Detect Threshold PS1, PS2 VREV -0.7 - -1.0 V Measured from PSx to PWR_OUT PS1 or PS2 = 2.5 V, 5C RON - 80 110 mW PS1 or PS2 = 5 V, 25C - - - PS1 or PS2 = 5 V, -40C to +85C - - 135 Parameter INPUT / OUTPUT Input Voltage PS1 or PS2 normal operation mode POWER SWITCHES Switch Resistance; SW1, SW2 LOGIC Input Threshold Voltage Input Current Voltage Increasing, Logic High PRIORITY, RM_EN1, RM_EN2 Vth_HIGH 1.0 - 1.5 Voltage Decreasing, Logic Low PRIORITY, RM_EN1, RM_EN2 Vth_LOW 0.4 - 0.8 IIN - 10 20 - 10 20 PRIORITY, Pull-Up RM_ENx, Pull-Down V mA Output Current HIGH VOH = VIN - 0.3 V SW1_STAT, SW2_STAT IOH - 10 15 mA Output Voltage LOW IOL = 3.0 mA SW1_STAT, SW2_STAT VOL - 0.3 0.4 V TIMING SW Turn-on Delay Time Measured from rising edge of RM_ENx to 10% of voltage at PSx; PSx = 2.0 V tON_DLY - 100 - ms SW Rise Time Measured at PWR_OUT 10% to 90% of voltage applied at PSx PS = 2.0 V tRISE - 200 300 ms - 100 250 tOFF - - 25 ms ms Measured at PWR_OUT 10% to 90% of voltage applied at PSx PS = 5 V SW Turn-off Time Measured at PWR_OUT 90% to 10% of voltage applied at PSx Over Voltage Turn-off Time PS = 0 V 10 V tOFF_OV1 - 10 - PS = 5 V 10 V tOFF_OV2 - 10 - Measured at PWR_OUT, OFF time during transition from PS1 PS2 or PS2 PS1 tOFF_BBM - 400 - ms Thermal Shutdown Temperature TSD - 145 - C Thermal Shutdown Hysteresis TSH - 10 - C Break-Before-Make Off Time THERMAL SHUTDOWN http://onsemi.com 5 CAT6500 1 RM_ENx 0 ON PSx tRISE OFF tON_DELAY tOFF Figure 4. Switch Timing Case 2 Case 1 10 V 10 V 7V 7V 5V 5V PSx PSx 0V 0V 5V 5V PWR_OUT PWR_OUT 0V 0V tOFF_OV1 tOFF_OV2 Figure 5. Overvoltage Turn-Off Timing 1 RM_EN1 0 1 RM_EN2 0 ON PS1 OFF ON PS2 OFF tOFF_BBM tOFF_BBM Figure 6. Break-Before-Make Switching http://onsemi.com 6 CAT6500 TYPICAL PERFORMANCE CHARACTERISTICS 41 102 90C 82 39 25C I SUPPLY (mA) I SUPPLY (mA) 92 -40C 72 62 42 29 2 3 4 5 27 6 4 5 6 Figure 7. Operating Supply Current vs. VCC Figure 8. Quiescent Supply Current vs. VCC 0.138 0.136 THRESHOLD VOLTAGE (V) 1.706 1.704 1.702 90C 1.700 25C 1.698 2 3 4 5 0.132 0.130 0.126 0.124 0.122 90C 2 3 4 5 6 SUPPLY VOLTAGE (V) SUPPLY VOLTAGE (V) Figure 9. PS_ Detect Threshold vs. VCC Figure 10. PS_ Release Threshold vs. VCC 1.5 0.85 THRESHOLD VOLTAGE (V) 0.90 1.4 1.3 1.2 -40C 1.1 25C 0.128 0.120 0.118 6 -40C 0.134 1.6 25C 0.9 0.8 3 SUPPLY VOLTAGE (V) -40C 1.0 2 -40C SUPPLY VOLTAGE (V) 1.708 1.696 90C 33 25C 31 1.710 THRESHOLD VOLTAGE (V) 35 52 32 THRESHOLD VOLTAGE (V) 37 90C -40C 0.80 25C 90C 0.75 0.70 0.65 0.60 0.55 0.50 2.0 2.5 3.0 3.5 4.0 4.5 5.0 5.5 0.45 6.0 2 3 4 5 SUPPLY VOLTAGE (V) SUPPLY VOLTAGE (V) Figure 11. Vth_HIGH vs. VCC Figure 12. Vth_LOW vs. VCC http://onsemi.com 7 6 CAT6500 7.12 95 7.10 90 SWITCH RESISTANCE (mW) OVER-VOLTAGE THRESHOLD (V) TYPICAL PERFORMANCE CHARACTERISTICS 7.08 -40C 7.06 7.04 90C 7.02 25C 7.00 6.98 6.96 2.0 2.5 3.0 3.5 4.0 4.5 5.0 5.5 70 -40C 65 60 55 2.0 2.5 3.0 3.5 4.0 4.5 5.0 SUPPLY VOLTAGE (V) Figure 13. Over-Voltage Threshold vs. VCC Figure 14. Switch RON vs. VCC 12.80 -40C 25C SW TURN-OFF TIME (ms) 300.08 250.08 90C 200.08 150.08 100.08 50.08 2 3 4 5 6 12.70 90C 12.65 25C 12.60 12.55 12.50 2 3 4 Figure 15. tON_DLY vs. VCC Figure 16. tOFF vs. VCC 90C 120.08 -40C 100.08 25C 80.08 60.08 40.08 20.08 0.08 2 3 4 5 SUPPLY VOLTAGE (V) Figure 17. tRISE vs. VCC http://onsemi.com 8 6.0 12.75 SUPPLY VOLTAGE (V) 140.08 5.5 -40C SUPPLY VOLTAGE (V) tRISE (ms) SW TURN-ON DELAY TIME (ms) 25C 75 SUPPLY VOLTAGE (V) 350.08 0.08 80 50 6.0 90C 85 6 5 6 CAT6500 PIN FUNCTIONS SW1, SW2 VCC SW1 and SW2 are low ON resistance power FET switches within CAT6500 and form the power transfer path between PS1, PS2 and PWR_OUT. SW1 and SW2 are bidirectional allowing for current to flow in either direction. They are controlled by the digital inputs PRIORITY, RM_EN1, RM_EN2. While they are not device pins they are defined here in order to make pin functions more understandable. VCC is an alternative power source for CAT6500 in the event neither PS1 nor PS2 is powered or if CAT6500 is in reverse-mode and is supplying power to an external device. VCC supplies only CAT6500's internal control logic circuitry and is never routed to PS1, PS2 or PWR_OUT. C1 CAT6500 can draw its operating current from several different inputs and will switch between these sources as they change or become available. To keep the chip's internal supply voltage stable during these transitions an external filter capacitor is required. The recommended value for C1 is between 0.1 mF and 1.0 mF. PS1, PS2 These are input pins for two external power sources which supply power for battery charging and system operation. On the basis of a PRIORITY input, CAT6500 will select from PS1 or PS2 and route power to PWR_OUT. If power on the preferred input is unavailable or the voltage is insufficient and a suitable power source is available on the other power input then CAT6500 will use the alternate source. PS1 and PS2 can also supply power to external devices if a reverse-mode command is given. In reverse-mode, PWR_OUT becomes the power source and is connected to either PS1 or PS2 in accord with the reverse-mode command. It is possible for both PS1 and PS2 to be powered simultaneously by PWR_OUT if commanded by the reverse-mode inputs. This dual command state also allows for power transfer between PS1 and PS2. GND The negative power input pin for CAT6500 and system ground. PRIORITY PRIORITY is a logic signal input that directs power source selection in forward mode if both PS1 & PS2 sources of power are present at the same time. For PRIORITY low, PS1 is selected. If only one source of power is present, CAT6500 will default to that source. PRIORITY can be overridden by a RM_ENx command in which case the associated power FET SW1 or SW2 is turned ON by the RM_EN command. PWR_OUT PWR_OUT is the common point between SW1 and SW2 and conducts power from either of these inputs to the system's power bus. When used in reverse mode PWR_OUT can supply power to an external load such as a USB device attached to PS1 or PS2. SW1_STAT, SW2_STAT SW1_STAT and SW2_STAT are open drain LOW true digital outputs indicating the operating state of Power Switch 1 (SW1) and Power Switch 2 (SW2), where a LOW indicates the switch is ON. SW1_STAT and SW2_STAT may be pulled up to an external voltage greater than VCC or greater than PSx as long as it does not exceed 5.5 V. SW1_STAT and SW2_STAT are active in reverse-mode and continue to indicate the operational status of SW1 and SW2. RM_EN1, RM_EN2 Reverse mode enable inputs are logic high signals which will override autonomous voltage source selection and force either SW1 or SW2 into an ON state. RM_EN1 and RM_EN2 act independently of each other and therefore can both be active at the same time. http://onsemi.com 9 CAT6500 CIRCUIT DESCRIPTION AND OPERATING CONSIDERATIONS Description if the voltage drops below 1.7 V as would CAT6500 otherwise do. This allows the power connection to be used for signaling purposes as in USB On-The-Go where power line signaling is used to request a transfer of bus Master status between devices. When operating in reverse mode, the SW1_STAT and SW2_STAT outputs are still active and will reflect the switch conditions. RM_EN1 and RM_EN2 are independent controls and can be activated simultaneously, meaning both SW1 and SW2 can be conducting at the same time. This presents both opportunities and hazards. Having both switches ON allows for simultaneous charging or powering of two devices from a single source; a USB power source can charge and operate the device as well as power an additional unit connected to the other PS input. Or the device can power two external units attached to PS1 and PS2. The downside of this capability becomes apparent when two operating power sources are present at the same time. If both switches are ON the power sources will compete with the stronger driving the weaker. For example; if a wall charger is attached to PS1 and an active USB port to PS2, with both SW1 and SW2 ON, the wall charger will likely dominate and push power backwards into the USB port, possibly elevating the USB bus voltage above allowable limits. Note: SW1 and SW2 are not current limited and can conduct very high currents if short circuited. Current limiting circuitry is advisable if short circuits are possible in the intended application. CAT6500 is an autonomous power selector switch designed for portable device applications where either of two power sources may be used for battery charging and device operation. CAT6500 can operate in two distinct modes, forward or reverse, depending on the states of the RM_ENx inputs. In forward mode, CAT6500 will automatically select from the available power sources, PS1 or PS2, and direct one to PWR_OUT. In reverse mode, a system power rail connected to PWR_OUT can source power to an external device attached to either PS1 or PS2. This allows charging or powering of other portable devices. Power Source Selection In forward mode, on-chip voltage detection circuitry senses the presence of a suitable power source at power inputs, PS1 and PS2. If both inputs are powered the PRIORITY pin sets the preferred power source directs that source to PWR_OUT. If only one of the two inputs is powered then that power source is directed to PWR_OUT. CAT6500 provides two status outputs SWx_STAT to indicate the presence of a voltage at either PS1 or PS2. These status outputs trigger at 1.7 V and are LOW true digital outputs. PRIORITY has an internal pull-up and defaults to a logic HIGH if the pin is disconnected or left floating. Input selection follows the truth table in Table 6. CAT6500 draws its operating power from PS1 or PS2 when a voltage of 2.5 V or more is present. If no power is present at PS1or PS2 or CAT6500 is in reverse mode, power will be drawn from VCC. CAT6500 provides overvoltage protection to circuitry downstream from the chip by limiting input voltages to 7 V. Should the voltage at PS1 or PS2 rise above 7 V then PWR_OUT will be disconnected from the power source until the voltage returns to safe levels. CAT6500 provides similar protection for reverse polarity voltages down to -5 V. Entering and Exiting Reverse Mode When entering or exiting Reverse Mode, it is recommended that power applied to PWR_OUT be sequenced with the enabling/disabling signal. It is best to enter Reverse Mode with PWR_OUT at 0 V and apply power after the logic control. Similarly on exiting Reverse Mode, power should be taken to 0 V and then the switch disabled. 1 Reverse Mode Operation The RM_ENx inputs allow CAT6500 to operate the power switches in reverse mode where the PWR_OUT becomes the supply powering PS1 and/or PS2. When RM_EN1 is logic high, SW1 switch is turned on and PWR_OUT is connected to PS1. When RM_EN2 is logic high, SW2 switch is turned on and PWR_OUT is connected to PS2. The switch connection remains on until the PWR_OUT voltage decreases all the way to 0 V (below 0.1 V typical) regardless of the state of the associated RM_ENx input. RM_EN is not affected by the voltage levels seen at PS1 or PS2 as PRIORITY and will not switch OFF automatically RM_EN 0 VOUT PWR_OUT 0V Figure 18. Entering and Exiting Reverse Mode http://onsemi.com 10 CAT6500 Over-Voltage initiates turning it ON, but the delay associated with turning ON the switch is very long compared to the overvoltage comparator's response time. The resulting voltage transient at PWR_OUT is very small to non-existent because the FET switch never gets the chance to turn fully ON. Case 2 assumes voltage is applied to a PS input and the internal FET switch is ON. If for some reason the applied voltage surges above the overvoltage threshold the FET will be turned OFF but a transient will be seen at PWR_OUT. The degree to which the voltage at PWR_OUT exceeds the overvoltage threshold depends upon the rate of voltage rise at PS compared to the comparator's response time. CAT6500 is tolerant to negative voltages as well and shuts OFF SW1 and SW2 when either PS1 or PS2 goes negative by more than 0.7 V. CAT6500 is designed to withstand input voltages of up to 18 V on the PS1 or PS2 inputs. In the event of such a fault condition, SW1 or SW2, whichever is exposed to the fault will shut OFF. This fault protection is voltage sensitive, activating at 7 V typically and overrides control inputs PRIORITY, RM_EN1 and RM_EN2. The response time of the over voltage detection circuit is constant and independent of the rise time of the overvoltage event, however the voltage transient seen at PWR_OUT will vary depending upon the operating conditions at the time of the event. Case 1 and Case 2 of Figure 5 illustrates this. In Case 1, an overvoltage is applied to a PS input as would happen if a malfunctioning or improper charger were used to recharge a handheld appliance. The internal FET switch is initially off and the application of voltage at the PS input Table 6. POWER SWITCH CONTROL AND SELECTION Inputs Connections PS1 PS2 RM_EN1 RM_EN2 PRIORITY SW1 SW2 X 0 1 Outputs PWR_OUT SW1_STAT SW2_STAT 0 0 1 1 0 PS1 0 1 0 1 PS2 1 0 L L 0 0 H L 0 0 L H 0 0 H H 0 0 1 0 PS1 0 1 H L 0 0 1 0 PS1 0 1 L H 0 0 0 1 PS2 1 0 0 1 H H 0 0 0 1 PS2 1 0 PWR_OUT Hi-Z 1 0 1 0 X 0 1 Hi-Z PWR_OUT 0 1 0 1 X 1 0 PWR_OUT PWR_OUT 1 1 1 1 X 0 0 L 1.7 V H 1.7 V 0 = Open 1 = Closed for voltage rising at PS X Default = 0 Default = 1 if left floating if left floating Break-Before-Make Switching Thermal Considerations When switching between power sources either under automatic control (PRIORITY) or in override (RM_EN), CAT6500 disables the active switch before the new connection is made. This ensures there will be no unintended cross conduction between PS1 and PS2. Even when SW1 and SW2 are commanded to be ON simultaneously there is a brief interval when both SW1 and SW2 are OFF. Figure 6 illustrates this. Under normal operating conditions SW1 and SW2 will dissipate some amount of heat which is a function of the current through the switch and RON. Typical heating curves are shown in Figure 19. CAT6500 is protected against overheating by an internal temperature sensor. Should the chip's temperature reach 145C CAT6500 will shut off both power switches until the die temperature drops to below approximately 135C, at which time the power switches will be returned to their original operating state. If the temperature again exceeds the thermal shutdown limit both switches will be disabled and this cycling will continue until current flowing through the switch is reduced, the load is removed or the switch is turned off under system control. http://onsemi.com 11 CAT6500 2.5 POWER DISSIPATION (W) 135 mW 2.0 110 mW 1.5 1.0 85 mW 0.5 0 0 1 2 3 SWITCH CURRENT (A) 4 Figure 19. Power Dissipation vs. Switch Current and Resistance 2.4 66 Power curve with PCB cu thk 2.0 oz 2.2 64 Power curve with PCB cu thk 1.0 oz 2.0 62 60 1.6 qJA curve with PCB cu thk (no vias) 1.0 oz 1.4 58 1.2 56 1.0 qJA curve with PCB cu thk (no vias) 2.0 oz 54 52 0.8 0 100 200 300 400 500 Copper Heat Spreader Area (mm2) Figure 20. qJA vs. Copper Heat Spreader Area http://onsemi.com 12 600 0.6 700 Power (W) qJA (C/W) 1.8 CAT6500 PACKAGE DIMENSIONS WQFN32 4.4x4.4, 0.4P CASE 485BN-01 ISSUE O PIN ONE REFERENCE CCC CCC CCC 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. 5. POSITIONAL TOLERANCE APPLIES TO ALL OF THE EXPOSED PADS. B A D L L L1 E DETAIL A ALTERNATE TERMINAL CONSTRUCTIONS 0.15 C 0.15 C TOP VIEW A A3 0.10 C MOLD CMPD A1 DETAIL B DETAIL B A1 SIDE VIEW C CC EE ALTERNATE CONSTRUCTIONS 0.08 C NOTE 4 A3 EEE CCC CCC EXPOSED Cu SEATING PLANE DIM A A1 A3 b D D2 D3 E E2 E3 e F L L1 MILLIMETERS MIN MAX 0.70 0.80 0.00 0.05 0.20 REF 0.15 0.25 4.40 BSC 1.30 1.50 1.25 1.45 4.40 BSC 1.70 1.90 0.90 1.10 0.40 BSC 1.55 BSC 0.30 0.50 0.05 0.15 NOTE 5 0.10 F 2X D2 DETAIL A C A B M F 2X 9 RECOMMENDED MOUNTING FOOTPRINT D3 NOTE 5 0.10 M C A B 2X 17 F 2X E2 2X 1 L 1.52 e 25 e/2 BOTTOM VIEW 32X 2X 1.47 1 2X 1.92 F 32X 4.70 3.22 E3 2X 3.22 b 0.10 M C A B 0.05 M C PACKAGE OUTLINE NOTE 3 1.12 0.40 PITCH 32X 0.25 4.70 32X 0.58 DIMENSIONS: MILLIMETERS 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. 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This literature is subject to all applicable copyright laws and is not for resale in any manner. PUBLICATION ORDERING INFORMATION LITERATURE FULFILLMENT: Literature Distribution Center for ON Semiconductor P.O. Box 5163, Denver, Colorado 80217 USA Phone: 303-675-2175 or 800-344-3860 Toll Free USA/Canada Fax: 303-675-2176 or 800-344-3867 Toll Free USA/Canada Email: orderlit@onsemi.com N. American Technical Support: 800-282-9855 Toll Free USA/Canada Europe, Middle East and Africa Technical Support: Phone: 421 33 790 2910 Japan Customer Focus Center Phone: 81-3-5773-3850 http://onsemi.com 13 ON Semiconductor Website: www.onsemi.com Order Literature: http://www.onsemi.com/orderlit For additional information, please contact your local Sales Representative CAT6500/D