CS8371 8.0 V/1.0 A, 5.0 V/250 mA Dual Regulator with Independent Output Enables and NOCAP The CS8371 is an 8.0 V/5.0 V dual output linear regulator. The 8.0 V ±5.0% output sources 1.0 A, while the 5.0 V ±5.0% output sources 250 mA. Each output is controlled by its own ENABLE lead. Setting the ENABLE input high turns on the associated regulator output. Holding both ENABLE inputs low puts the IC into sleep mode where current consumption is less than 10 µA. The regulator is protected against overvoltage, short–circuit and thermal runaway conditions. The device can withstand 45 V load dump transients making suitable for use in automotive environments. ON’s proprietary NOCAP solution is the first technology which allows the output to be stable without the use of an external capacitor. The CS8371 is available in a 7 lead TO–220 package with copper tab. The tab can be connected to a heatsink if necessary. http://onsemi.com TO–220 SEVEN LEAD T SUFFIX CASE 821E 1 7 TO–220 SEVEN LEAD TVA SUFFIX CASE 821J 1 TO–220 SEVEN LEAD THA SUFFIX CASE 821H Features • Two Regulated Outputs – 8.0 V ±5.0%; 1.0 A – 5.0 V ±5.0%; 250 mA • Independent ENABLE for Each Output • Seperate Sense Feedback Lead for 8.0 V Output • < 10 µA Sleep Mode Current • Fault Protection – Overvoltage Shutdown – +45 V Peak Transient Voltage – Short Circuit – Thermal Shutdown • CMOS Compatible, Low Current ENABLE Inputs 1 7 PIN CONNECTIONS AND MARKING DIAGRAM CS8371 AWLYWW Tab = GND Pin 1. ENABLE1 2. ENABLE2 3. VOUT2 4. GND 5. Sense 6. VCC 7. VOUT1 1 A WL, L YY, Y WW, W = Assembly Location = Wafer Lot = Year = Work Week ORDERING INFORMATION Device Package Shipping CS8371ET7 TO–220* STRAIGHT 50 Units/Rail CS8371ETVA7 TO–220* VERTICAL 50 Units/Rail CS8371ETHA7 TO–220* HORIZONTAL 50 Units/Rail *Seven lead. Semiconductor Components Industries, LLC, 2001 January, 2001 – Rev. 8 1 Publication Order Number: CS8371/D CS8371 VCC Overvoltage Shutdown ENABLE1 VOUT1 – + 1.2 V Current Limit Pre–Regulator Bias Generator + – Sense NOCAP Trimmed Bandgap Voltage Reference Thermal Shutdown ENABLE2 – + 1.2 V – + VOUT2 Current Limit GND Figure 1. Block Diagram ABSOLUTE MAXIMUM RATINGS* Rating Value Unit Internally Limited – ENABLE Input Voltage Range –0.6 to +10 V Load Current (8.0 V Regulator) Internally Limited – Load Current (5.0 V Regulator) Internally Limited – 45 V Storage Temperature Range –65 to +150 °C Junction Temperature Range –40 to +150 °C 260 peak °C Power Dissipation Transient Peak Voltage (31 V Load Dump @ 14 V VCC) Lead Temperature Soldering: Wave Solder (through hole styles only) (Note 1.) 1. 10 second maximum. *The maximum package power dissipation must be observed. http://onsemi.com 2 CS8371 ELECTRICAL CHARACTERISTICS: (–40°C ≤ TA ≤ +85°C, 10.5 V ≤ VCC ≤ 16 V, ENABLE1 = ENABLE2 = 5.0 V, IOUT1 = IOUT2 = 5.0 mA, unless otherwise stated.) Test Conditions Characteristic Min Typ Max Unit 7.60 8.00 8.40 V Primary Output (VOUT1) Output Voltage IOUT1 = 1.0 A Line Regulation 10.5 V ≤ VCC ≤ 26 V – – 50 mV Load Regulation 5.0 mA ≤ IOUT1 ≤ 1.0 A – – 150 mV Sleep Mode Quiescent Current VCC = 14 V, ENABLE1 = ENABLE2 = 0 V 0 0.2 10.0 µA Quiescent Current VCC = 14 V, IOUT1 = 1.0 A, IOUT2 = 250 mA – – 30 mA Dropout Voltage IOUT1 = 250 mA IOUT1 = 1.0 A – – – 1.2 1.5 V V Quiescent Bias Current IOUT1 = 5.0 mA, ENABLE2 = 0 V, VCC = 14 V, IQ = ICC – IOUT1 IOUT1 = 1.0 A, ENABLE2 = 0 V, VCC = 14 V, IQ = ICC – IOUT1 – – 10 mA – – 22 mA Ripple Rejection f = 120 Hz, VCC = 14 V with 1.0 VPP AC, COUT = 0 µF f = 10 kHz, VCC = 14 V with 1.0 VPP AC, COUT = 0 µF f = 20 kHz, VCC = 14 V with 1.0 VPP AC, COUT = 0 µF – – – 90 74 68 – – – dB dB dB Current Limit VCC = 16 V 1.1 – 2.5 A Overshoot Voltage 5.0 mA ≤ IREG1 ≤ 1.0 A – – 6.0 V Output Noise 10 Hz – 100 kHz – 300 – µVrms Output Voltage IOUT2 = 250 mA 4.75 5.00 5.25 V Line Regulation 7.0 V ≤ VCC ≤ 26 V – – 40 mV Load Regulation 5.0 mA ≤ IOUT2 ≤ 250 mA – – 100 mV Dropout Voltage IOUT2 = 5.0 mA IOUT2 = 250 mA – – – 2.2 2.5 V V Quiescent Bias Current IOUT2 = 5.0 mA, ENABLE1 = 0 V, VCC = 14 V, IQ = ICC – IOUT2 IOUT2 = 250 mA, ENABLE1 = 0 V, VCC = 14 V, IQ = ICC – IOUT2 – – 7.0 mA – – 8.0 mA Ripple Rejection f = 120 Hz, VCC = 14 V with 1.0 VPP AC, COUT = 0 µF f = 10 kHz, VCC = 14 V with 1.0 VPP AC, COUT = 0 µF f = 20 kHz, VCC = 14 V with 1.0 VPP AC, COUT = 0 µF – – – 90 75 67 – – – dB dB dB Current Limit VCC = 16 V 270 – 600 mA Overshoot Voltage 5.0 mA ≤ IREG2 ≤ 250 mA – – 4.3 V Output Noise 10 Hz – 100 kHz – 170 – µVrms –150 – 150 µA Secondary Output (VOUT2) ENABLE Function (ENABLE) Input Current VCC = 14 V, 0 V ≤ ENABLE ≤ 5.5 V Input Voltage Low High 0 2.0 – – 0.8 5.0 V V Human Body Model ±2.0 ±4.0 – kV 24 – 30 V 150 180 – °C – 30 – °C Protection Circuitry ESD Threshold Overvoltage Shutdown Thermal Shutdown Thermal Hysteresis – Guaranteed by Design – http://onsemi.com 3 CS8371 PACKAGE PIN DESCRIPTION PACKAGE LEAD # 7 Lead TO–220 LEAD SYMBOL 1 ENABLE1 ENABLE control for the 8.0 V, 1.0 A output. 2 ENABLE2 ENABLE control for the 5.0 V, 250 mA output. 3 VOUT2 4 GND 5 Sense 6 VCC Supply voltage, usually from battery. 7 VOUT1 8.0 V ±5.0%, 1.0 A regulated output. FUNCTION 5.0 V ±5.0%, 250 mA regulated output. Ground. Sense feedback for the primary 8.0 V output. TYPICAL PERFORMANCE CHARACTERISTICS 8.05 8.04 5.00 VIN = 14 V IOUT = 1.0 A Output Voltage (V) Output Voltage (V) 8.03 8.02 8.01 8.00 7.99 7.98 4.95 VIN = 14 V IOUT = 250 A 4.90 7.97 7.96 7.95 4.85 –40 –20 0 20 40 60 80 100 120 140 –40 –20 0 20 40 60 80 100 120 Ambient Temperature (°C) Ambient Temperature (°C) Figure 2. Regulator 1 Output Voltage Figure 3. Regulator 2 Output Voltage 2.0 140 2.5 1.8 2.0 Dropout Voltage (V) Dropout Voltage (V) 1.6 1.4 1.2 –40°C 1.0 85°C 0.8 0.6 25°C –40°C 1.5 85°C 25°C 1.0 0.5 0.4 0.2 0 0 0 100 200 300 400 500 600 0 700 800 900 1000 50 100 150 200 Output Current (mA) Output Current (mA) Figure 4. Regulator 1 Dropout Voltage Figure 5. Regulator 2 Dropout Voltage http://onsemi.com 4 250 CS8371 10 10 VIN = 14 V TA = 25°C 8 7 6 5 4 3 2 0 7 6 5 4 3 2 0 0 1 2 3 0 300 400 Figure 6. Regulator 1 Current Limit Figure 7. Regulator 2 Current Limit 500 1.0 Enable 1 = 5.0 V Enable 2 = 5.0 V VIN = 14 V IOUT1 = 1.0 A IOUT2 = 250 mA 7.5 0.9 Quiescent Current (µA) 8.0 7.0 6.5 6.0 5.5 5.0 0.8 Enable 1 = 0 V Enable 2 = 0 V VIN = 14 V 0.7 0.6 0.5 0.4 0.3 0.2 0.1 4.5 0 4.0 –20 0 20 40 60 80 –40 –20 0 20 40 60 Ambient Temperature (°C) Ambient Temperature (°C) Figure 8. Quiescent Current Figure 9. Quiescent Current 80 4.0 6.0 Enable 1 = 5.0 V Enable 2 = 0 V VIN = 14 V Enable 1 = 0 V Enable 2 = 5.0 V VIN = 14 V 3.8 Quiescent Current (mA) 5.5 200 Reg 2 Output Current (mA) 8.5 –40 100 Reg 1 Output Current (A) 9.0 Quiescent Current (mA0 8 1 1 Quiescent Current (mA) VIN = 14 V TA = 25°C 9 Reg 2 Output Voltage (V) Reg 1 Output Voltage (V) 9 5.0 4.5 IOUT = 5.0 mA IOUT = 1.0 A 4.0 3.5 3.6 3.4 3.2 IOUT = 250 mA IOUT = 5.0 mA 3.0 2.8 2.6 2.4 2.2 3.0 –40 –20 0 20 40 60 2.0 80 –40 –20 0 20 40 60 80 Ambient Temperature (°C) Ambient Temperature (°C) Figure 10. Regulator 1 Quiescent Current Figure 11. Regulator 2 Quiescent Current http://onsemi.com 5 CS8371 8.020 5.02 VIN = 14 V 8.015 5.01 8.010 5.00 8.005 Output Voltage (V) Output Voltage (V) VIN = 14 V –40°C 85°C 8.000 25°C 7.995 4.97 7.985 4.95 0 200 250 1 2 3 4 5 6 7 8 9 10 11 Reg 2 Output Voltage (V) Figure 13. Regulator 2 Load Regulation 8 7 6 5 4 3 2 1 0 5 4 3 2 1 0 12 COUT = 0 µF TA = 25°C IOUT = 5.0 mA 0 1 2 3 4 5 6 7 8 9 10 Time (µs) Time (µs) Figure 14. Regulator 1 Startup Figure 15. Regulator 2 Startup 16 14 12 10 0 150 Figure 12. Regulator 1 Load Regulation COUT = 0 µF TA = 25°C 2 1 0 –1 –2 100 Output Current (mA) COUT = 0 µF TA = 25°C IOUT = 5.0 mA 0 50 Output Current (mA) Enable 2 (V) Enable 1 (V) 5 4 3 2 1 0 –40°C 4.94 100 200 300 400 500 600 700 800 900 1000 Input Voltage (V) Output Voltage Deviation (V) Reg 1 Output Voltage (V) 8 7 6 5 4 3 2 1 0 85°C 4.98 4.96 0 Input Voltage (V) Output Voltage Deviation (V) 4.99 7.990 7.980 25°C 100 200 300 400 500 600 11 COUT = 0 µF TA = 25°C 0.6 0.4 0.2 0 –0.2 –0.4 –0.6 16 14 12 10 0 100 200 300 400 500 Time (ns) Time (ns) Figure 16. Regulator 1 Line Transient Response Figure 17. Regulator 2 Line Transient Response http://onsemi.com 6 12 600 VIN = 14 V COUT = 0 µF TA = 25°C 3 2 1 0 –1 –2 –3 1000 5 0 5 10 15 20 25 30 VIN = 14 V COUT = 0 µF TA = 25°C +500 0 –500 250 5 0 5 10 15 20 25 Time (µs) Time (µs) Figure 18. Regulator 1 Load Transient Response Figure 19. Regulator 2 Load Transient Response TA = 25°C VIN = 14 V COUT = 0 µF 80 60 30 TA = 25°C VIN = 14 V COUT = 0 µF 100 Ripple Rejection (dB) 100 80 60 40 40 20 20 1 10 100 1k 10k 100k 1M 1 10 100 1k 10k 100k Frequency (Hz) Frequency (Hz) Figure 20. Regulator 1 Ripple Rejection Figure 21. Regulator 2 Ripple Rejection 5 Output Capacitor ESR (Ω) Ripple Rejection (dB) Load Current (mA) Output Voltage Deviation (mV) Load Current (mA) Output Voltage Deviation (V) CS8371 TA = 25°C VIN = 14 V RESR ≤ 1.6 Ω IOUT = 5.0 mA to 1.0 A 1 Unstable Region 0 .01 0.1 1 10 100 1000 Output Capacitor Size (µF) Figure 22. Regulator 1 Stability http://onsemi.com 7 1M CS8371 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. Output Noise Voltage – The rms AC voltage at the output, with constant load and no input ripple, measured over a specified frequency range. Quiescent Current – The part of the positive input current that does not contribute to the positive load current. 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. Temperature Stability of VOUT – The percentage change in output voltage for a thermal variation from room temperature to either temperature extreme. 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. Current Limit – Peak current that can be delivered to the output. Input Voltage – The DC voltage applied to the input terminals with respect to ground. Input Output Differential – The voltage difference between the unregulated input voltage and the regulated output voltage for which the regulator will operate. 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. C1 * 0.1 µF VOUT1 8.0 V CS8371 Control VIN ENABLE1 5.0 V ENABLE2 VOUT2 Tuner IC GND * C1 is required if the regulator is far from the power source filter. Figure 23. Applications Circuit APPLICATION NOTES load capacitor value, ESR (Equivalent Series Resistance) and board layout parasitics all can create oscillations if not properly accounted for. NOCAP is an ON Semiconductor exclusive output stage which internally compensates the LDO regulator over temperature, load and line variations without the need for an expensive external capacitor. It incorporates high gain (>80 dB) and large unity gain bandwidth (>100 kHz) while maintaining many of the characteristics of a single–pole amplifier (large phase margin and no overshoot). NOCAP is ideally suited for slow switching or steady loads. If the load displays large transient current requirements, such as with high frequency microprocessors, an output storage capacitor may be needed. Some large capacitor and small capacitor ESR values at the output may With seperate control of each output channel, the CS8371 is ideal for applications where each load must be switched independently. In an automotive radio, the 8.0 V output drives the displays and tape drive motors while the 5.0 V output supplies the Tuner IC and memory. Stability Considerations/NOCAP Normally a low dropout or quasi–low dropout regulator (or any type requiring a slow lateral PNP in the control loop) necessitates a large external compensation capacitor at the output of the IC. The external capacitor is also used to curtail overshoot, determine startup delay time and load transient response. Traditional LDO regulators typically have low unity gain bandwidth, display overshoot and poor ripple rejection. Compensation is also an issue because the high frequency http://onsemi.com 8 CS8371 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. cause small signal oscillations at the output. This will depend on the load conditions. With these types of loads, a traditional output stage may be better suited for proper operation. Output 1 employs NOCAP. Refer to the plots in the Typical Performance Characteristics section for appropriate output capacitor selections for stability if an external capacitor is required by the switching characteristics of the load. Output 2 has a Darlington NPN–type output structure and is inherently stable with any type of capacitive load or no capacitor at all. IIN SMART REGULATOR VIN Control Features Calculating Power Dissipation in a Dual Output Linear Regulator IOUT1 VOUT1 IOUT2 VOUT2 IQ The maximum power dissipation for a dual output regulator (Figure 24) is Figure 24. Dual Output Regulator With Key Performance Parameters Labeled. PD(max) VIN(max) VOUT1(min)IOUT1(max) VIN(max) VOUT2(min)IOUT2(max) VIN(max)IQ (1) Heat Sinks 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 IOUT(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 will have a thermal resistance. Like series electrical resistances, these resistances are summed to determine the value of RΘJA: RJA RJC RCS RSA Once the value of PD(max) is known, the maximum permissible value of RΘJA can be calculated: RJA 150°C TA PD (3) where: RΘJC = the junction–to–case thermal resistance, RΘCS = the case–to–heatsink thermal resistance, and RΘSA = the heatsink–to–ambient thermal resistance. 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. (2) 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. http://onsemi.com 9 CS8371 PACKAGE DIMENSIONS TO–220 SEVEN LEAD T SUFFIX CASE 821E–04 ISSUE C Q NOTES: 1. DIMENSIONING AND TOLERANCING PER ANSI Y14.5M, 1982. 2. CONTROLLING DIMENSION: INCH. 3. DIMENSION D DOES NOT INCLUDE DAMBAR PROTRUSION. ALLOWABLE PROTRUSION SHALL BE 0.003 (0.076) TOTAL IN EXCESS OF THE D DIMENSION AT MAXIMUM MATERIAL CONDITION. A G B D L DIM A B C D G H J K L M Q U V U K OPTIONAL CHAMFER M M SEATING PLANE C H M V INCHES MIN MAX 0.600 0.610 0.386 0.403 0.170 0.180 0.028 0.037 0.045 0.055 0.088 0.102 0.018 0.026 1.028 1.042 0.355 0.365 5 NOM 0.142 0.148 0.490 0.501 0.045 0.055 MILLIMETERS MIN MAX 15.24 15.49 9.80 10.23 4.32 4.56 0.71 0.94 1.15 1.39 2.24 2.59 0.46 0.66 26.11 26.47 9.02 9.27 5 NOM 3.61 3.75 12.45 12.72 1.15 1.39 M J TO–220 SEVEN LEAD TVA SUFFIX CASE 821J–02 ISSUE A –T– C B –Q– E W A U H F L K M D 0.356 (0.014) M N S 7 PL T Q M G R J http://onsemi.com 10 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. DIM A B C D E F G H J K L M N Q R S U W INCHES MIN MAX 0.560 0.590 0.385 0.415 0.160 0.190 0.023 0.037 0.045 0.055 0.540 0.555 0.050 BSC 0.570 0.595 0.014 0.022 0.785 0.800 0.322 0.337 0.073 0.088 0.090 0.115 0.146 0.156 0.289 0.304 0.164 0.179 0.460 0.475 3° MILLIMETERS MIN MAX 14.22 14.99 9.77 10.54 4.06 4.82 0.58 0.94 1.14 1.40 13.72 14.10 1.27 BSC 14.48 15.11 0.36 0.56 19.94 20.32 8.18 8.56 1.85 2.24 2.28 2.91 3.70 3.95 7.34 7.72 4.17 4.55 11.68 12.07 3° CS8371 TO–220 SEVEN LEAD THA SUFFIX CASE 821H–02 ISSUE A 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. 1. LEADS MAINTAIN A RIGHT ANGLE WITH RESPECT TO THE PACKAGE BODY TO WITH 0.020". –T– C B –Q– E W A U F L K M D 0.356 (0.014) M J 7 PL T Q M N G DIM A B C D E F G J K L M N Q S U W INCHES MIN MAX 0.560 0.590 0.385 0.415 0.160 0.190 0.023 0.037 0.045 0.055 0.568 0.583 0.050 BSC 0.015 0.022 0.728 0.743 0.322 0.337 0.101 0.116 0.090 0.115 0.146 0.156 0.150 0.200 0.460 0.475 3° S PACKAGE THERMAL DATA Parameter TO–220 SEVEN LEAD Unit RΘJC Typical 2.4 °C/W RΘJA Typical 50 °C/W http://onsemi.com 11 MILLIMETERS MIN MAX 14.22 14.99 9.77 10.54 4.06 4.82 0.58 0.94 1.14 1.40 14.43 14.81 1.27 BSC 0.38 0.56 18.49 18.87 8.18 8.56 2.57 2.95 2.28 2.91 3.70 3.95 3.81 5.08 11.68 12.07 3° CS8371 NOCAP is a trademark of Semiconductor Components Industries, LLC (SCILLC). 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. 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