CS5257A−1 7.0 A LDO 5−Pin Adjustable Linear Regulator This new very low dropout regulator is designed to power the next generation of advanced microprocessors. To achieve very low dropout, the internal pass transistor is powered separately from the control circuitry. Furthermore, with the control and power inputs tied together, this device can be used in single supply configuration and still offer a better dropout voltage than conventional PNP−NPN based LDO regulators. In this mode the dropout is determined by the minimum control voltage. It is supplied in five−terminal TO−220−5 and D2PAK−5 packages, allowing for the implementation of a remote−sense pin permitting very accurate regulation of output voltage directly at the load, where it counts, rather than at the regulator. This remote sensing feature virtually eliminates output voltage variations due to load changes and resistive voltage drops. Typical load regulation measured at the sense pin is 1.0 mV for an output voltage of 2.5 V with a load step of 10 mA to 7.0 A. The very fast transient loop response easily meets the needs of the latest microprocessors. In addition, a small capacitor on the Adjust pin will further improve the transient capabilities. Internal protection circuitry provides for “bust−proof” operation, similar to three−terminal regulators. This circuitry, which includes overcurrent, short circuit, supply sequencing and overtemperature protection will self protect the regulator under all fault conditions. The CS5257A−1 is ideal for generating a secondary 2.0 V − 2.5 V low voltage supply on a motherboard where both 5.0 V and 3.3 V are already available. http://onsemi.com TO−220−5 T SUFFIX CASE 314D 1 5 D2PAK−5 DP SUFFIX CASE 936AC 1 5 MARKING DIAGRAMS 1.25 V to 5.0 V VOUT at 7.0 A VPOWER Dropout < 0.35 V @ 7.0 A VCONTROL Dropout < 1.1 V @ 7.0 A 1.5% Trimmed Reference Fast Transient Response Remote Voltage Sensing Thermal Shutdown Current Limit Short Circuit Protection Drop−In Replacement for LT1580 Backwards Compatible with 3−Pin Regulators D2PAK−5 TO−220−5 Features • • • • • • • • • • • Tab = VOUT Pin 1. VSENSE 2. Adjust 3. VOUT 4. VCONTRO 5. VPOWER CS5257A−1 AWLYWW CS 5257A−1 AWLYWW 1 1 A WL, L YY, Y WW, W = Assembly Location = Wafer Lot = Year = Work Week ORDERING INFORMATION Package Shipping† CS5257A−1GT5 TO−220−5 50 Units/Rail CS5257A−1GDP5 D2PAK−5 50 Units/Rail CS5257A−1GDPR5 D2PAK−5 750 Tape & Reel Device †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. © Semiconductor Components Industries, LLC, 2006 September, 2006 − Rev. 10 1 Publication Order Number: CS5257A−1/D CS5257A−1 5.0 V VCONTROL VOUT CS5257A−1 2.5 V @ 7.0 A 3.3 V VPOWER VSENSE 124 1.0% Adjust 10 mF 10 V 100 mF 5.0 V 0.1 mF 5.0 V 124 1.0% 300 mF 5.0 V Load Figure 1. Application Diagram MAXIMUM RATINGS* Rating Value Unit VPOWER Input Voltage 6.0 V VCONTROL Input Voltage 13 V 0 to 150 °C −65 to +150 °C 2.0 kV 260 peak 230 peak °C °C Operating Junction Temperature Range, TJ Storage Temperature Range ESD Damage Threshold Lead Temperature Soldering: Wave Solder (through hole styles only) Note 1 Reflow (SMD styles only) Note 2 1. 10 second maximum. 2. 60 second maximum above 183°C. *The maximum package power dissipation must be observed. ELECTRICAL CHARACTERISTICS (0°C ≤ TA ≤ 70°C; 0°C ≤ TJ ≤ 150°C; VSENSE = VOUT and VADJ = 0 V; unless otherwise specified.) Test Conditions Min Typ Max Unit Reference Voltage VCONTROL = 2.75 V to 12 V, VPOWER = 2.05 V to 5.5 V, 10 mA ≤ IOUT ≤ 7.0 A 1.234 (−1.5%) 1.253 1.272 (+1.5%) V Line Regulation VCONTROL = 2.5 V to 12 V, VPOWER = 1.75 V to 5.5 V, IOUT = 10 mA − 0.02 0.2 % Load Regulation (Note 3) VCONTROL = 2.75 V, VPOWER = 2.05 V, IOUT = 10 mA to 7.0 A, with Remote Sense − 0.04 0.2 % Minimum Load Current (Note 4) VCONTROL = 5.0 V, VPOWER = 3.3 V, DVOUT = +1.0% − 5.0 10 mA Control Pin Current (Note 5) VCONTROL = 2.75 V, VPOWER = 2.05 V, IOUT = 100 mA VCONTROL = 2.75 V, VPOWER = 2.05 V, IOUT = 4.0 A VCONTROL = 2.75 V, VPOWER = 1.75 V, IOUT = 4.0 A VCONTROL = 2.75 V, VPOWER = 2.05 V, IOUT = 7.0 A − − − − 6.0 30 33 60 10 60 70 180 mA mA mA mA Adjust Pin Current VCONTROL = 2.75 V, VPOWER = 2.05 V, IOUT = 10 mA − 60 120 mA Current Limit VCONTROL = 2.75 V, VPOWER = 2.05 V, DVOUT = −1.5% 7.1 10 − A Characteristic CS5257A−1 3. This parameter is guaranteed by design and is not 100% production tested. 4. The minimum load current is the minimum current required to maintain regulation. Normally the current in the resistor divider used to set the output voltage is selected to meet the minimum load current requirement. 5. The VCONTROL pin current is the drive current required for the output transistor. This current will track output current with roughly a 1:100 ratio. The minimum value is equal to the quiescent current of the device. http://onsemi.com 2 CS5257A−1 ELECTRICAL CHARACTERISTICS (continued) (0°C ≤ TA ≤ 70°C; 0°C ≤ TJ ≤ 150°C; VSENSE = VOUT and VADJ = 0 V; unless otherwise specified.) Characteristic Test Conditions Min Typ Max Unit CS5257A−1 Short Circuit Current VCONTROL = 2.75 V, VPOWER = 2.05 V, VOUT = 0 V 5.0 9.0 − A Ripple Rejection (Note 6) VCONTROL = VPOWER = 3.25 V VRIPPLE = 1.0 VP−P @ 120 Hz, IOUT = 4.0 A, CADJ = 0.1 mF 60 80 − dB Thermal Regulation 30 ms Pulse, TA = 25°C − 0.002 − %/W VCONTROL Dropout Voltage (Minimum VCONTROL − VOUT) (Note 7) VPOWER = 2.05 V, IOUT = 100 mA VPOWER = 2.05 V, IOUT = 1.0 A VPOWER = 2.05 V, IOUT = 2.75 A VPOWER = 2.05 V, IOUT = 4.0 mA VPOWER = 2.05 V, IOUT = 7.0 A − − − − − 1.00 1.00 1.00 1.00 1.10 1.15 1.15 1.15 1.15 1.25 V V V V V VPOWER Dropout Voltage (Minimum VPOWER − VOUT) (Note 7) VCONTROL = 2.75 V, IOUT = 100 mA VCONTROL = 2.75 V, IOUT = 1.0 A VCONTROL = 2.75 V, IOUT = 2.75 A VCONTROL = 2.75 V, IOUT = 4.0 mA VCONTROL = 2.75 V, IOUT = 7.0 A − − − − − 0.10 0.15 0.20 0.26 0.35 0.15 0.20 0.30 0.40 0.65 V V V V V RMS Output Noise Freq = 10 Hz to 10 kHz, TA = 25°C − 0.003 − %VOUT Temperature Stability − − 0.5 − % Thermal Shutdown (Note 8) − 150 180 210 °C Thermal Shutdown Hysteresis − − − 25 °C VCONTROL Supply Only Output Current VCONTROL = 13 V, VPOWER Not Connected, VADJ = VOUT = VSENSE = 0 V − − 50 mA VPOWER Supply Only Output Current VPOWER = 6.0 V, VCONTROL Not Connected, VADJ = VOUT = VSENSE = 0 V − 0.1 1.0 mA 6. This parameter is guaranteed by design and is not 100% production tested. 7. Dropout is defined as either minimum control voltage (VCONTROL) or minimum power voltage (VPOWER) to output voltage differential required to maintain 1.5% regulation at a particular load. 8. This parameter is guaranteed by design, but not parametrically tested in production. However, a 100% thermal shutdown functional test is performed on each part. PACKAGE PIN DESCRIPTION PACKAGE PIN # TO−220−5 D2PAK−5 PIN SYMBOL FUNCTION 1 1 VSENSE This Kelvin sense pin allows for remote sensing of the output voltage at the load for improved regulation. It is internally connected to the positive input of the voltage sensing error amplifier. 2 2 Adjust This pin is connected to the low side of the internally trimmed 1.5% bandgap reference voltage and carries a bias current of about 50 mA. A resistor divider from Adjust to VOUT and from Adjust to ground sets the output voltage. Also, transient response can be improved by adding a small bypass capacitor from this pin to ground. 3 3 VOUT This pin is connected to the emitter of the power pass transistor and provides a regulated voltage capable of sourcing 7.0 A of current. 4 4 VCONTROL This is the supply voltage for the regulator control circuitry. For the device to regulate, this voltage should be between 1.0 V and 1.25 V (depending on the output current) greater than the output voltage. The control pin current will be about 1.0% of the power pin output current. 5 5 VPOWER This is the power input voltage. This pin is physically connected to the collector of the power pass transistor. For the device to regulate, this voltage should be between 0.1 V and 0.65 V greater than the output voltage depending on the output current. The output load current of 7.0 A is supplied through this pin. http://onsemi.com 3 CS5257A−1 VPOWER VCONTROL BIAS and TSD − + VREF EA IA + − VOUT VSENSE Adjust Figure 2. Block Diagram 0.100 0.10 0.075 0.09 Output Voltage Deviation (%) Output Voltage Deviation (%) TYPICAL PERFORMANCE CHARACTERISTICS 0.050 0.025 0 −0.025 −0.050 −0.075 IO = 10 mA VCONTROL = 2.75 V VPOWER = 2.05 V −0.100 −0.125 −0.150 0 VPOWER = 2.05 V VCONTROL = 2.75 V 0.08 0.07 0.06 0.05 0.04 0.03 0.02 0.01 0 10 20 30 40 50 60 70 80 90 100 110 120 130 0 Figure 3. Reference Voltage vs Temperature 3.0 4.0 5.0 6.0 7.0 VCONTROL = 2.75 V 12.0 0 Output Current (A) Output Voltage Deviation (mV) 14.0 50 COUT = 330 mF CPOWER = 110 mF CCONTROL = 10 mF CADJ = 0.1 mF VCONTROL = 5.0 V VPOWER = 3.3 V VOUT = 2.5 V −50 −100 Current (A) 2.0 Figure 4. Load Regulation vs Output Current 100 7.0 10.0 8.0 6.0 4.0 2.0 0 0 1.0 Output Current (A) TJ (°C) 0 1 2 3 4 5 0 0 0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0 4.5 5.0 5.5 VPOWER − VOUT (V) Time (ms) Figure 5. Transient Response Figure 6. Short Circuit Current vs VPOWER − VOUT http://onsemi.com 4 83 1200 81 1150 Minimum Load Current (mA) Adjust Pin Current (mA) CS5257A−1 79 77 75 73 71 69 1100 1050 1000 950 900 850 67 65 VPOWER = 3.3 V DVOUT = +1.0% 0 20 40 60 80 100 120 140 800 1.0 160 2.0 3.0 Temperature (°C) VPOWER = 2.05 V IL = 10 mA 9.0 10 11 Ripple Rejection (dB) 72 71 70 60 50 VIN − VOUT = 2.0 V IOUT = 4.0 A VRIPPLE = 1.0 VP−P COUT = 22 mF CADJ = 0.1 mF 40 30 20 2.0 3.0 4.0 5.0 6.0 7.0 8.0 9.0 10 10 1 10 11 102 103 104 105 106 Frequency (Hz) VCONTROL − VOUT (V) Figure 9. Adjust Pin Current vs VCONTROL − VOUT Figure 10. Ripple Rejection vs Frequency 1.25 75 VCONTROL = 2.75 V IL = 10 mA VCONTROL Dropout Voltage (V) Adjust Pin Current (mA) 8.0 80 73 73 72 71 70 0.5 7.0 90 74 74 6.0 Figure 8. Minimum Load Current vs VCONTROL − VOUT 75 Adjust Pin Current (mA) 5.0 VCONTROL − VOUT (V) Figure 7. Adjust Pin Current vs Temperature 70 1.0 4.0 1.5 2.5 3.5 VPOWER = 2.05 V 1.00 0.75 0.50 0.25 0 4.5 0 VPOWER − VOUT (V) 1.0 2.0 3.0 4.0 5.0 6.0 Output Current (A) Figure 11. Adjust Pin Current vs VPOWER − VOUT Figure 12. VCONTROL Dropout Voltage vs IOUT http://onsemi.com 5 7.0 CS5257A−1 916.4 0.9 916.3 VCONTROL = 2.75 V 0.8 Minimum Load Current (mA) VPOWER Dropout Voltage (V) 1.0 0.7 0.6 0.5 0.4 0.3 0.2 916.2 916.1 916.0 915.9 915.8 915.7 915.6 915.5 0.1 0 VCONTROL = 5.0 V DVOUT = +1.0% 0 1.0 2.0 3.0 4.0 5.0 6.0 915.4 0.5 7.0 1.5 Figure 13. VPOWER Dropout Voltage vs IOUT Adjust Pin Current (mA) 77 2.5 3.5 4.5 VPOWER − VOUT (V) Output Current (A) Figure 14. Minimum Load Current vs VPOWER − VOUT VPOWER = 2.05 V VCONTROL = 2.75 V 76 75 74 73 72 0 1.0 2.0 3.0 4.0 5.0 6.0 7.0 8.0 Output Current (A) Figure 15. Adjust Pin Current vs Output Current APPLICATIONS NOTES THEORY OF OPERATION The CS5257A−1 linear regulator provides adjustable voltages from 1.25 V to 5.0 V at currents up to 7.0 A. The regulator is protected against short circuits, and includes a thermal shutdown circuit with hysteresis. The output, which is current limited, consists of a PNP − NPN transistor pair and requires an output capacitor for stability. A detailed procedure for selecting this capacitor is included in the Stability Considerations section. voltage will not turn on until both supplies are operating. If the control voltage comes up first, the output current will be typically limited to about 3.0 mA until the power input voltage comes up. If the power input voltage comes up first the output will not turn on at all until the control voltage comes up. The output can never come up unregulated. The CS5257A−1 can also be used as a single supply device with the control and power inputs tied together. In this mode, the dropout will be determined by the minimum control voltage. VPOWER Function The CS5257A−1 utilizes a two supply approach to maximize efficiency. The collector of the power device is brought out to the VPOWER pin to minimize internal power dissipation under high current loads. VCONTROL provides power for the control circuitry and the drive for the output NPN transistor. VCONTROL should be at least 1.0 V greater than the output voltage. Special care has been taken to ensure that there are no supply sequencing problems. The output Output Voltage Sensing The CS5257A−1 five terminal linear regulator includes a dedicated VSENSE function. This allows for true Kelvin sensing of the output voltage. This feature can virtually eliminate errors in the output voltage due to load regulation. Regulation will be optimized at the point where the sense pin is tied to the output. http://onsemi.com 6 CS5257A−1 DESIGN GUIDELINES before the VPOWER supply. This allows the IC to begin charging the output capacitor as soon as the VPOWER to VOUT differential is large enough that the pass transistor conducts. As VPOWER increases, the pass transistor will remain in dropout, and current is passed to the load until VOUT is in regulation. Further increase in the supply voltage brings the pass transistor out of dropout. In this manner, any output voltage less than 13 V may be regulated, provided the VPOWER to VOUT differential is less than 6.0 V. In the case where VCONTROL and VPOWER are shorted, there is no theoretical limit to the regulated voltage as long as the VPOWER to VOUT differential of 6.0 V is not exceeded. There is a possibility of damaging the IC when VPOWER − VIN is greater than 6.0 V if a short circuit occurs. Short circuit conditions will result in the immediate operation of the pass transistor outside of its safe operating area. Overvoltage stresses will then cause destruction of the pass transistor before overcurrent or thermal shutdown circuitry can become active. Additional circuitry may be required to clamp the VPOWER to VOUT differential to less than 6.0 V if fail safe operation is required. One possible clamp circuit is illustrated in Figure 17; however, the design of clamp circuitry must be done on an application by application basis. Care must be taken to ensure the clamp actually protects the design. Components used in the clamp design must be able to withstand the short circuit condition indefinitely while protecting the IC. Adjustable Operation This LDO adjustable regulator has an output voltage range of 1.25 V to 5.0 V. An external resistor divider sets the output voltage as shown in Figure 16. The regulator’s voltage sensing error amplifier maintains a fixed 1.253 V reference between the output pin and the adjust pin. VCONTROL VOUT CS5257A−1 VPOWER VSENSE Adjust R1 R2 Figure 16. An External Resistor Divider Sets the Value of VOUT. The 1.253 V Reference Voltage Drops Across R1. A resistor divider network R1 and R2 causes a fixed current to flow to ground. This current creates a voltage across R2 that adds to the 1.253 V across R1 and sets the overall output voltage. The adjust pin current (typically 50 mA) also flows through R2 and adds a small error that should be taken into account if precise adjustment of VOUT is necessary. The output voltage is set according to the formula: VOUT + 1.253 V R1 ) R2 ) R2 R1 External Supply IADJ VCONTROL The term IADJ × R2 represents the error added by the adjust pin current. R1 is chosen so that the minimum load current is a least 10 mA. R1 and R2 should be of the same composition for best tracking over temperature. The divider resistors should be placed physically as close to the load as possible. While not required, a bypass capacitor connected between the adjust pin and ground will improve transient response and ripple rejection. A 0.1 mF tantalum capacitor is recommended for “first cut” design. Value and type may be varied to optimize performance vs. price. VSENSE VPOWER VOUT VADJ Figure 17. Example Clamp Circuitry for VPOWER − VOUT > 6.0 V Stability Considerations Other Adjustable Operation Considerations The output compensation capacitor helps determine three main characteristics of a linear regulator: start−up delay, load transient response, and loop stability. The capacitor value and type is based on cost, availability, size and temperature constraints. A tantalum or aluminum electrolytic capacitor is best, since a film or ceramic capacitor with almost zero ESR can cause instability. The aluminum electrolytic capacitor is the least expensive The CS5257A−1 linear regulator has an absolute maximum specification of 6.0 V for the voltage difference between VIN and VOUT. However, the IC may be used to regulate voltages in excess of 6.0 V. The two main considerations in such a design are the sequencing of power supplies and short circuit capability. Power supply sequencing should be such that the VCONTROL supply is brought up coincidentally with or http://onsemi.com 7 CS5257A−1 solution. However, when the circuit operates at low temperatures, both the value and ESR of the capacitor will vary considerably. The capacitor manufacturer’s data sheet provides this information. A 300 mF tantalum capacitor will work for most applications, but with high current regulators such as the CS5257A−1 the transient response and stability improve with higher values of capacitor. The majority of applications for this regulator involve large changes in load current so the output capacitor must supply the instantaneous load current. The ESR of the output capacitor causes an immediate drop in output voltage given by: DV + DI I+C ESR Current Limit The internal current limit circuit limits the output current under excessive load conditions. Short Circuit Protection The device includes short circuit protection circuitry that clamps the output current at approximately two amperes less than its current limit value. This provides for a current foldback function, which reduces power dissipation under a direct shorted load. Protection Diodes When large external capacitors are used with a linear regulator it is sometimes necessary to add protection diodes. If the input voltage of the regulator gets shorted, the output capacitor will discharge into the output of the regulator. The discharge current depends on the value of the capacitor, the output voltage, and the rate at which VCONTROL drops. In the CS5257A−1 regulator, the discharge path is through a large junction and protection diodes are not usually needed. If the regulator is used with large values of output capacitance and the input voltage is instantaneously shorted to ground, damage can occur. In this case, a diode connected as shown in Figure 18 is recommended. Thermal Shutdown The thermal shutdown circuitry is guaranteed by design to activate above a die junction temperature of approximately 150°C and to shut down the regulator output. This circuitry has 25°C of typical hysteresis, thereby allowing the regulator to recover from a thermal fault automatically. Calculating Power Dissipation and Heat Sink Requirements High power regulators such as the CS5257A−1 usually operate at high junction temperatures. Therefore, it is important to calculate the power dissipation and junction temperatures accurately to ensure that an adequate heat sink is used. Since the package tab is connected to VOUT on the CS5257A−1, electrical isolation may be required for some applications. Also, as with all high power packages, thermal compound in necessary to ensure proper heat flow. For added safety, this high current LDO includes an internal thermal shutdown circuit. The thermal characteristics of an IC depend on the following four factors: junction temperature, ambient temperature, die power dissipation, and the thermal resistance from the die junction to ambient air. The maximum junction temperature can be determined by: VOUT CS5257A−1 VPOWER V where: I is the current flow out of the load capacitance when VCONTROL is shorted, C is the value of load capacitance, V is the output voltage, and T is the time duration required for VCONTROL to transition from high to being shorted. If the calculated current is greater than or equal to the typical short circuit current value provided in the specifications, serious thought should be given to the use of a protection diode. For microprocessor applications it is customary to use an output capacitor network consisting of several tantalum and ceramic capacitors in parallel. This reduces the overall ESR and reduces the instantaneous output voltage drop under transient load conditions. The output capacitor network should be as close to the load as possible for the best results. VCONTROL T VSENSE Adjust TJ(max) + TA(max) ) PD(max) Figure 18. Diode Protection Against VCONTROL Short Circuit Conditions RQJA The maximum ambient temperature and the power dissipation are determined by the design while the maximum junction temperature and the thermal resistance depend on the manufacturer and the package type. The maximum power dissipation for a regulator is: Use of the diode has the added benefit of bleeding VOUT to ground if VCONTROL is shorted. This prevents an unregulated output from causing system damage. A rule of thumb useful in determining if a protection diode is required is to solve for current http://onsemi.com 8 CS5257A−1 The value for RqJC is 1.4°C/watt for the CS5257A−1 in both the TO−220−5 and D2PAK−5 packages. For a high current regulator such as the CS5257A−1 the majority of heat is generated in the power transistor section. The value for RqSA depends on the heat sink type, while the RqCS depends on factors such as package type, heat sink interface (is an insulator and thermal grease used?), and the contact area between the heat sink and the package. Once these calculations are complete, the maximum permissible value of RqJA can be calculated and the proper heat sink selected. For further discussion on heat sink selection, see our application note “Thermal Management,” document number AND8036/D, available through the Literature Distribution Center or via our website at http://www.onsemi.com. PD(max) + (VIN(max) * VOUT(min))IOUT(max) ) VIN(max) IIN(max) A heat sink effectively increases the surface area of the package to improve the flow of heat away from the IC and into the surrounding air. Each material in the heat flow path between the IC and the outside environment has a thermal resistance which is measured in degrees per watt. Like series electrical resistances, these thermal resistances are summed to determine the total thermal resistance between the die junction and the surrounding air, RqJA. This total thermal resistance is comprised of three components. These resistive terms are measured from junction to case (RqJC), case to heat sink (RqCS), and heat sink to ambient air (RqSA). The equation is: RQJA + RQJC ) RQCS ) RQSA http://onsemi.com 9 CS5257A−1 PACKAGE DIMENSIONS TO−220−5 T SUFFIX CASE 314D−04 ISSUE E −T− −Q− B E A U NOTES: 1. DIMENSIONING AND TOLERANCING PER ANSI Y14.5M, 1982. 2. CONTROLLING DIMENSION: INCH. 3. DIMENSION D DOES NOT INCLUDE INTERCONNECT BAR (DAMBAR) PROTRUSION. DIMENSION D INCLUDING PROTRUSION SHALL NOT EXCEED 10.92 (0.043) MAXIMUM. C L DIM A B C D E G H J K L Q U 1234 5 K D SEATING PLANE J H G 5 PL 0.356 (0.014) M T Q M http://onsemi.com 10 INCHES MIN MAX 0.572 0.613 0.390 0.415 0.170 0.180 0.025 0.038 0.048 0.055 0.067 BSC 0.087 0.112 0.015 0.025 0.990 1.045 0.320 0.365 0.140 0.153 0.105 0.117 MILLIMETERS MIN MAX 14.529 15.570 9.906 10.541 4.318 4.572 0.635 0.965 1.219 1.397 1.702 BSC 2.210 2.845 0.381 0.635 25.146 26.543 8.128 9.271 3.556 3.886 2.667 2.972 CS5257A−1 PACKAGE DIMENSIONS D2PAK−5 DP SUFFIX CASE 936AC−01 ISSUE O For D2PAK Outline and Dimensions − Contact Factory PACKAGE THERMAL DATA Parameter TO−220−5 D2PAK−5 Unit RqJC Typical 1.4 1.4 °C/W RqJA Typical 50 10−50* °C/W *Depending on thermal properties of substrate. RqJA = RqJC + RqCA. 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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