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 µA when supplying 100 µA 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 µA when supplying 100 µA 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 5–lead D2PAK. 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 µA 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–PIN DP SUFFIX CASE 936F 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* Device Package Shipping CS8481YDP5 D2PAK, 5–PIN 50 Units/Rail CS8481YDPR5 D2PAK, 5–PIN 750 Tape & Reel *Consult your local sales representative for SO–8, SO–16, DIP–8, DIP–16, TO–220 FIVE LEAD, and D2PAK 7–PIN packaging options. Semiconductor Components Industries, LLC, 2001 February, 2001 – Rev. 7 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 ABSOLUTE 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 Reflow (SMD styles only) (Note 1.) 1. 60 second maximum above 183°C *The maximum package power dissipation must be observed. http://onsemi.com 2 CS8481 ELECTRICAL CHARACTERISTICS: (6.0 V ≤ VIN ≤ 26 V, IOUT1 = IOUT2 = 100 µA, –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 µA ≤ 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 µA Output Voltage, (VOUT2) 100 µA ≤ IOUT2 ≤ 100 mA 4.85 5.00 5.15 V Dropout Voltage IOUT2 = 100 mA IOUT2 = 100 µA – 400 100 600 150 mV mV Line Regulation 6.0 V ≤ VIN ≤ 26 V – 5.0 50 mV Load Regulation 100 µA ≤ 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 µA 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 µA 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 µA Note 1. 150 180 – °C 30 34 38 V Protection Circuits Overtemperature Threshold Overvoltage Shutdown – 1. Guaranteed by Design. PACKAGE PIN DESCRIPTION PACKAGE LEAD # D2PAK, 5–PIN 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 outout 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) VOUT2 Figure 3. Dual Output Regulator With Key Performance Parameters Labeled. 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 RΘJA: Once the value of PD(max) is known, the maximum permissible value of RΘJA can be calculated: RJA RJC RCS RSA The value of RΘJA can be compared with those in the package section of the data sheet. Those packages with RΘJA’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. RΘJC appears in the package section of the data sheet. Like RΘJA, it too is a function of package type. RΘCS and RΘSA 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 * CS8281 22 µF ESR < 8 Ω P VOUT1 22 µF ESR < 8 Ω C3** Load (3) where: RΘJC = the junction–to–case thermal resistance, RΘCS = the case–to–heatsink thermal resistance, and RΘSA = the heatsink–to–ambient thermal resistance. (2) VBATT 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). 0.1 µF VOUT1 Control Features The maximum power dissipation for a dual output regulator (Figure 3) is 150°C TA RJA PD 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 & Application Circuit http://onsemi.com 5 CS8481 PACKAGE DIMENSIONS D2PAK, FIVE PIN DP SUFFIX CASE 936F–01 ISSUE O –T– SEATING PLANE B NOTES: 1. DIMENSIONS AND TOLERANCING PER ANSI Y14.5M, 1982. 2. CONTROLLING DIMENSION: INCH. 3. TAB CONTOUR OPTIONAL WITHIN DIMENSIONS B AND M. 4. DIMENSIONS A AND B DO NOT INCLUDE MOLD FLASH OR GATE PROTRUSIONS. MOLD FLASH AND GATE PROTRUSIONS NOT TO EXCEED 0.025 (0.635) MAX. C M E DIM A B C D E F G H J K M N A 1 2 3 4 5 K F G D H 5 PL 0.13 (0.005) M T B J M INCHES MIN MAX 0.326 0.336 0.396 0.406 0.170 0.180 0.026 0.035 0.045 0.055 0.090 0.110 0.067 BSC 0.098 0.108 0.018 0.025 0.204 0.214 0.055 0.066 0.000 0.004 N PACKAGE THERMAL DATA Parameter D2PAK, 5–PIN Unit RΘJC Typical 2.4 °C/W RΘJA Typical 10–50* °C/W * Depending on thermal properties of substrate. RΘJA = RΘJC + RΘCA http://onsemi.com 6 MILLIMETERS MIN MAX 8.28 8.53 10.05 10.31 4.31 4.57 0.66 0.91 1.14 1.40 2.29 2.79 1.70 BSC 2.49 2.74 0.46 0.64 5.18 5.44 1.40 1.68 0.00 0.10 CS8481 Notes http://onsemi.com 7 CS8481 SMART REGULATOR is a registered trademark of Semiconductor Components Industries, LLC (SCILLIC). ON Semiconductor and are 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. SCILLC products are not designed, intended, or authorized for use as components in systems intended for surgical implant into the body, or other applications intended to support or sustain life, or for any other application in which the failure of the SCILLC product could create a situation where personal injury or death may occur. Should Buyer purchase or use SCILLC products for any such unintended or unauthorized application, Buyer shall indemnify and hold SCILLC and its officers, employees, subsidiaries, affiliates, and distributors harmless against all claims, costs, damages, and expenses, and reasonable attorney fees arising out of, directly or indirectly, any claim of personal injury or death associated with such unintended or unauthorized use, even if such claim alleges that SCILLC was negligent regarding the design or manufacture of the part. SCILLC is an Equal Opportunity/Affirmative Action Employer. PUBLICATION ORDERING INFORMATION NORTH AMERICA 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: [email protected] Fax Response Line: 303–675–2167 or 800–344–3810 Toll Free USA/Canada N. American Technical Support: 800–282–9855 Toll Free USA/Canada CENTRAL/SOUTH AMERICA: Spanish Phone: 303–308–7143 (Mon–Fri 8:00am to 5:00pm MST) Email: ONlit–[email protected] ASIA/PACIFIC: LDC for ON Semiconductor – Asia Support Phone: 303–675–2121 (Tue–Fri 9:00am to 1:00pm, Hong Kong Time) Toll Free from Hong Kong & Singapore: 001–800–4422–3781 Email: ONlit–[email protected] JAPAN: ON Semiconductor, Japan Customer Focus Center 4–32–1 Nishi–Gotanda, Shinagawa–ku, Tokyo, Japan 141–0031 Phone: 81–3–5740–2745 Email: [email protected] EUROPE: LDC for ON Semiconductor – European Support German Phone: (+1) 303–308–7140 (Mon–Fri 2:30pm to 7:00pm CET) Email: ONlit–[email protected] French Phone: (+1) 303–308–7141 (Mon–Fri 2:00pm to 7:00pm CET) Email: ONlit–[email protected] English Phone: (+1) 303–308–7142 (Mon–Fri 12:00pm to 5:00pm GMT) Email: [email protected] ON Semiconductor Website: http://onsemi.com EUROPEAN TOLL–FREE ACCESS*: 00–800–4422–3781 *Available from Germany, France, Italy, UK, Ireland For additional information, please contact your local Sales Representative. http://onsemi.com 8 CS8481/D