CS8481 3.3 V/250 mA, 5.0 V/100 mA Micropower Low Dropout Regulator with ENABLE The CS8481 is a precision, dual Micropower linear voltage regulator. The switched 3.3 V primary output (VOUT1) supplies up to 250 mA while the secondary 5.0 V (VOUT2) is capable of supplying 100 mA. Both outputs have a maximum dropout voltage of 600 mV and low reverse current. Quiescent current drain is typically 150 A when supplying 100 A from each output. The ENABLE input provides logic level control of the primary output. With the primary output disabled, quiescent current drain is typically 100 A when supplying 100 A from the secondary output. The CS8481 is extremely robust with protection provided for reverse battery, short circuit, overvoltage, and overtemperature on both outputs. The CS8481 is available in a D2PAK−5. Features • 3.3 V/250 mA Primary Output • 5.0 V/100 mA Secondary Output • 3.0% Tolerance, Both Outputs • ON/OFF Control for Primary Output • Low Quiescent Current Drain (100 A VOUT2) • Low Reverse Current • Protection Features − Reverse Battery (−15 V) − 74 V Peak Transient Voltage − Short Circuit − Overtemperature − Overvoltage (34 V) http://onsemi.com D2PAK−5 DP SUFFIX CASE 936AC 1 5 PIN CONNECTIONS AND MARKING DIAGRAM Tab = GND Pin 1. VIN 2. VOUT1 3. GND 4. VOUT2 5. ENABLE CS8481 AWLYWW 1 A WL, L YY, Y WW, W = Assembly Location = Wafer Lot = Year = Work Week ORDERING INFORMATION* Package Shipping† CS8481YDP5 D2PAK−5 50 Units/Rail CS8481YDPR5 D2PAK−5 750 Tape & Reel Device *Consult your local sales representative for SO−8, SO−16, DIP−8, DIP−16, TO−220−5, and D2PAK−7 packaging options. †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, 2004 January, 2004 − Rev. 9 1 Publication Order Number: CS8481/D CS8481 Primary Output VOUT1 (3.3 V) VIN ENABLE + − VOUT1SENSE Current Limit + − Bandgap Reference Overvoltage Shutdown Thermal Shutdown Secondary Output VOUT2 (5.0 V) VOUT2SENSE Current Limit + − Pwr GND GND Figure 1. Block Diagram MAXIMUM RATINGS* Rating Value Unit 30 −15 74 V V V 10 V Internally Limited − Maximum Junction Temperature −40 to +150 °C Storage Temperature Range −55 to +150 °C 4.0 kV 230 peak °C Input Voltage (VIN) Operating Range Reverse Battery Peak Transient Voltage (60 V Load Dump @ 14 V VIN) ENABLE Power Dissipation Electrostatic Discharge (Human Body Model) Lead Temperature Soldering 1. 60 second maximum above 183°C *The maximum package power dissipation must be observed. Reflow (SMD styles only) (Note 1) http://onsemi.com 2 CS8481 ELECTRICAL CHARACTERISTICS: (6.0 V ≤ VIN ≤ 26 V, IOUT1 = IOUT2 = 100 A, −40°C ≤ TA ≤ 125°C, −40°C ≤ TC ≤ 125°C; unless otherwise specified.) Test Conditions Characteristic Min Typ Max Unit 3.2 3.3 3.4 V Primary Output Stage (VOUT1) Output Voltage, VOUT1 100 A ≤ IOUT1 ≤ 250 mA Line Regulation 6.0 V ≤ VIN ≤ 26 V − 5.0 50 mV Load Regulation 1.0 mA ≤ IOUT1 ≤ 250 mA, VIN = 14 V − 5.0 50 mV Quiescent Current ENABLE = HIGH, VIN = 16V, IOUT1 = 250 mA − 22 50 mA Ripple Rejection f = 120 Hz, IOUT1 = 125 mA, 7.0 V ≤ VIN ≤ 17 V 60 70 − dB Current Limit 9.0 V ≤ VIN ≤ 26 V 260 400 − mA Short Circuit Current Limit VOUT1 = 0 V, VIN = 16 V 25 − − mA Reverse Current VOUT1 = 3.3 V, VIN = 0 V − 100 1500 A Output Voltage, (VOUT2) 100 A ≤ IOUT2 ≤ 100 mA 4.85 5.00 5.15 V Dropout Voltage IOUT2 = 100 mA IOUT2 = 100 A − 400 100 600 150 mV mV Line Regulation 6.0 V ≤ VIN ≤ 26 V − 5.0 50 mV Load Regulation 100 A ≤ IOUT2 ≤ 100 mA, VIN = 14 V − 5.0 50 mV Quiescent Current ENABLE = LOW, VIN = 12.8 V ENABLE = HIGH, VIN = 16 V, IOUT2 = 100 mA − − 100 8.0 150 30 A mA Ripple Rejection f = 120 Hz; IOUT2 = 10 mA, 7.0 V ≤ VIN ≤ 17 V 60 70 − dB Current Limit 9.0 V ≤ VIN ≤ 26 V 105 200 − mA Short Circuit Current Limit VOUT2 = 0 V, VIN = 16 V, IOUT1 = 0 A 25 − − mA Reverse Current VOUT2 = 5.0 V, VIN = 0 V − 100 250 A Secondary Output (VOUT2) ENABLE Function (ENABLE) Input Threshold ENABLE = LOW, 6.0 V ≤ VIN ≤ 26 V ENABLE = HIGH, 6.0 V ≤ VIN ≤ 26 V − 2.0 1.2 1.2 0.8 − V V Input Bias Current 0 V ≤ VENABLE ≤ 5.0 V −2.0 0 2.0 A Note 2 150 180 − °C 30 34 38 V Protection Circuits Overtemperature Threshold Overvoltage Shutdown − 2. Guaranteed by Design. PACKAGE PIN DESCRIPTION PACKAGE LEAD # D2PAK−5 LEAD SYMBOL 1 VIN 2 VOUT1 3 GND 4 VOUT2 5 ENABLE FUNCTION Supply voltage to IC, usually direct from battery. 3.3 V regulated output which is activated by ENABLE input. Ground connection. Standby output 5.0 V, 100 mA capability; always on. CMOS compatible input lead; switches VOUT1. When ENABLE is high, VOUT1 is active. http://onsemi.com 3 CS8481 DEFINITION OF TERMS Load Regulation − The change in output voltage for a change in load current at constant chip temperature. Long Term Stability − Output voltage stability under accelerated life−test conditions after 1000 hours with maximum rated voltage and junction temperature. Quiescent Current − The part of the positive input current that does not contribute to the positive load current, i.e., the regulator ground lead current. Ripple Rejection − The ratio of the peak−to−peak input ripple voltage to the peak−to−peak output ripple voltage. Short Circuit Current Limit − Peak current that can be delivered by the outPut when forced to 0 V. Temperature Stability of VOUT − The percentage change in output voltage for a thermal variation from room temperature to either temperature extreme. Current Limit − Peak current that can be delivered to the output. Dropout Voltage − The input−output voltage differential at which the circuit ceases to regulate against further reduction in input voltage. Measured when the output voltage has dropped 100 mV from the nominal value obtained at 14 V input, dropout voltage is dependent upon load current and junction temperature. Input Output Differential − The voltage difference between the unregulated input voltage and the regulated output voltage for which the regulator will operate. Input Voltage − The DC voltage applied to the input terminals with respect to ground. Line Regulation − The change in output voltage for a change in the input voltage. The measurement is made under conditions of low dissipation or by using pulse techniques such that the average chip temperature is not significantly affected. 74 V VIN 14 V ENABLE 2.0 V 0.8 V 30 V 34 V 3.3 V 14 V 3.0 V 3.3 V 3.3 V 3.3 V 3.3 V 3.3 V 2.4 V VOUT1 0V 0V 5.0 V VOUT2 5.0 V System Condition 5.0 V 5.0 V 0V 5.0 V 0V 5.0 V 5.0 V 2.4 V 0V Turn On Load Dump Low VIN Line Noise, Etc. VOUT1 Short Circuit VOUT2 Short Circuit Thermal Shutdown Turn Off Figure 2. Typical Circuit Waveform APPLICATION NOTES General Worst−case is determined at the minimum ambient temperature and maximum load expected. Output capacitors can be increased in size to any desired value above the minimum. One possible purpose of this would be to maintain the output voltages during brief conditions of negative input transients that might be characteristic of a particular system. Capacitors must also be rated at all ambient temperatures expected in the system. To maintain regulator stability down to −40°C, capacitors rated at that temperature must be used. More information on capacitor selection for SMART REGULATORs is available in the SMART REGULATOR application note, “Compensation for Linear Regulators,” document number SR003AN/D, available through the Literature Distribution Center or via our website at http://www.onsemi.com. The CS8481 is a Micropower dual regulator. All bias required to operate the internal circuitry is derived from the standby output, VOUT2. If this output experiences an over current situation and collapses, then VOUT1 will also collapse (see Figure 2). If there is critical circuitry that must remain active under most conditions it should be connected to VOUT2. Any circuitry that is likely to be subjected to a short circuit, e.g., circuitry outside the module, should be connected to VOUT1. External Capacitors Output capacitors are required for stability with the CS8481. Without them, the regulator outputs will oscillate. Actual size and type may vary depending upon the application load and temperature range. Capacitor effective series resistance (ESR) is also a factor in the IC stability. http://onsemi.com 4 CS8481 ENABLE IIN The ENABLE function controls VOUT1. When ENABLE is high, VOUT1 is on. When ENABLE is low, VOUT1 is off. Calculating Power Dissipation in a Dual Output Linear Regulator PD(max) VIN(max) VOUT1(min)IOUT1(max) VIN(max) VOUT2(min)IOUT2(max) VIN(max)IQ (1) Heat Sinks 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 will have a thermal resistance. Like series electrical resistances, these resistances are summed to determine the value of RJA: RJA RJC RCS RSA The value of RJA can be compared with those in the package section of the data sheet. Those packages with RJA’s less than the calculated value in equation 2 will keep the die temperature below 150°C. In some cases, none of the packages will be sufficient to dissipate the heat generated by the IC, and an external heatsink will be required. RJC appears in the package section of the data sheet. Like RJA, it too is a function of package type. RCS and RSA are functions of the package type, heatsink and the interface between them. These values appear in heat sink data sheets of heat sink manufacturers. VCC VOUT2 VIN C2** C1 * CS8481 22 F ESR < 8 P VOUT1 22 F ESR < 8 C3** Load (3) where: RJC = the junction−to−case thermal resistance, RCS = the case−to−heatsink thermal resistance, and RSA = the heatsink−to−ambient thermal resistance. (2) VBATT VOUT2 Figure 3. Dual Output Regulator With Key Performance Parameters Labeled. Once the value of PD(max) is known, the maximum permissible value of RJA can be calculated: 0.1 F IOUT2 IQ where: VIN(max) is the maximum input voltage, VOUT1(min) is the minimum output voltage from VOUT1, VOUT2(min) is the minimum output voltage from VOUT2, IOUT1(max) is the maximum output current, for the application, IOUT2(max) is the maximum output current, for the application, and IQ is the quiescent current the regulator consumes at both IOUT1(max) and IOUT2(max). 150°C TA PD VOUT1 Control Features The maximum power dissipation for a dual output regulator (Figure 3) is RJA IOUT1 SMART REGULATOR VIN ENABLE I/O GND GND * C1 required if regulator is located far from power supply filter. ** C2 and C3 required for stability. Capacitor must operate at minimum temperature expected during system operations. Figure 4. Test and Application Circuit http://onsemi.com 5 CS8481 PACKAGE DIMENSIONS D2PAK−5 DP SUFFIX CASE 936AC−01 ISSUE O For D2PAK Outline and Dimensions − Contact Factory PACKAGE THERMAL DATA Parameter D2PAK−5 Unit RJC Typical 2.4 °C/W RJA Typical 10−50* °C/W * Depending on thermal properties of substrate. RJA = RJC + RCA SMART REGULATOR is a registered trademark of Semiconductor Components Industries, LLC (SCILLC). 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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