CS8361 CS8361 5V Dual Micropower Low Dropout Regulator with ENABLE and RESET Description Features The second output tracks the 5V standby output through an external adjust lead, and can supply loads of 250mA with a typical dropout voltage of 400mV. The logic level ENABLE lead is used to control this tracking regulator output. The CS8361 is a precision micropower dual voltage regulator with ENABLE and RESET . The 5V standby output is accurate within ±2% while supplying loads of 100mA and has a typical dropout voltage of 400mV. Quiescent current is low, typically 140µA with a 300µA load. The active RESET output monitors the 5V standby output and holds the RESET line low during powerup and regulator dropout conditions. The RESET circuit includes hysteresis and is guaranteed to operate correctly with 1V on the standby output. Both outputs are protected against overvoltage, short circuit, reverse battery and overtemperature conditions. The robustness and low quiescent current of the CS8361 makes it not only well suited for automotive microprocessor applications, but for any battery powered microprocessor applications. Block Diagram VSTBY VIN Overvoltage Shutdown 5V,100mA,2% Current Limit Bandgap ■ 2 Regulated Outputs Standby Output 5V ±2%; 100mA Tracking Output 5V; 250mA ■ Low Dropout Voltage (0.4V at rated current) ■ RESET Option ■ ENABLE Option ■ Low Quiescent Current ■ Protection Features Independent Thermal Shutdown Short Circuit 60V Load Dump Reverse Battery Package Options 16 Lead PDIP & SOIC Wide (internally fused leads) RESET OVSD + BG VIN BG – TSD VSTBY 1 NC OVSD VIN VTRK NC VTRK NC Gnd Gnd Gnd Gnd Adj NC NC NC 250mA ENABLE Current Limit Thermal Shutdown TSD RESET 7L D2PAK 7L TO-220 – Adj + ENABLE VSTANDBY – + TSD 1. VSTBY 2. VIN 3. VTRK 4. Gnd 5. Adj 6. ENABLE 7. RESET OVSD BG RESET + Gnd RESET 1 1 – Also available in 20 Lead SOIC Wide. Consult factory for 20 Lead PSOP . * Consult factory for positive ENABLE option. Cherry Semiconductor Corporation 2000 South County Trail, East Greenwich, RI 02818 Tel: (401)885-3600 Fax: (401)885-5786 Email: [email protected] Web Site: www.cherry-semi.com Rev. 5/4/99 1 A ® Company CS8361 Absolute Maximum Ratings Supply Voltage, VIN .....................................................................................................................................................-16V to 26V Positive Transient Input Voltage, tr > 1ms.............................................................................................................................60V Negative Transient Input Voltage, T < 100ms, 1% Duty Cycle..........................................................................................-50V Input Voltage Range ( ENABLE , RESET ) ...............................................................................................................-0.3V to 10V Junction Temperature...........................................................................................................................................-40¡C to +150¡C Storage Temperature Range ................................................................................................................................-55¡C to +150¡C ESD Susceptibility (Human Body Model)..............................................................................................................................2kV Lead Temperature Soldering Wave Solder (through hole styles only) .....................................................................................10 sec. max, 260¡C peak Reflow (SMD styles only) ......................................................................................60 sec. max above 183¡C, 230¡C peak Electrical Characteristics: 6V ² VIN ² 26V, IOUT1 = IOUT2 = 100µA, -40¡C ² TA ²+125¡C, -40¡C ²TJ ² +150¡C, unless otherwise specified. PARAMETER TEST CONDITIONS MIN TYP MAX UNIT +25 mV 1.5 5 µA ■ Tracking Output (VTRK) VSTBY Ð VTRK, VTRK Tracking Error 6V ² VIN ² 26V 100µA ² ITRK ² 250mA (note 1) -25 Adjust Pin Current, IAdj Loop in Regulation Line Regulation 6V ² VIN ² 26V (note 1) 5 50 mV Load Regulation 100µA ² ITRK ² 250mA (note 1) 5 50 mV Dropout Voltage (VIN Ð VTRK) ITRK = 100µA ITRK = 250mA 100 400 150 700 mV mV Current Limit VIN = 12V, VTRK = 4.5 Quiescent Current VIN = 12V, ITRK = 250mA No Load on VSTBY 25 50 mA Reverse Current VTRK = 5V, VIN = 0V 200 1500 µA Ripple Rejection f = 120Hz, ITRK = 250mA 7V ² VIN ² 17V 275 500 mA 60 70 dB 4.90 5.00 5.10 V ■ Standby Output (VSTBY) Output Voltage, VSTBY 6V ² VIN ² 26V 100µA ² ISTBY ² 100mA Line Regulation 6V ² VIN ² 26V 5 50 mV Load Regulation 100µA ² ISTBY ² 100mA 5 50 mV Dropout Voltage (VIN Ð VSTBY) ISTBY = 100µA ISTBY = 100mA 100 400 150 600 mV mV Current Limit VIN = 12V, VSTBY = 4.5V 125 200 mA Short Circuit Current VIN = 12V, VSTBY = 0V 10 100 mA Quiescent Current VIN = 12V, ISTBY = 100mA ITRK = 0mA 10 20 mA VIN = 12V, ISTBY = 300µA ITRK = 0mA 140 200 µA Reverse Current VSTBY = 5V, VIN = 0V 100 200 µA Ripple Rejection f = 120Hz, ISTBY = 100mA 7V ² VIN ² 17V 60 70 Note 1: VTRK connected to Adj lead. VTRK can be set to higher values by using an external resistor divider. 2 dB CS8361 Electrical Characteristics: 6V ² VIN ² 26V, IOUT1 = IOUT2 = 100µA, -40¡C ² TA ²+125¡C, -40¡C ²TJ ² +150¡C, unless otherwise specified. PARAMETER TEST CONDITIONS MIN TYP MAX UNIT 0.8 1.2 2.0 V µA ■ RESET ENABLE Functions ENABLE Input Threshold ENABLE Input Bias Current VENABLE = 0V to 10V -10 0 10 RESET Threshold High (VRH) VSTBY Increasing 4.59 4.87 VSTBY-0.02 V 60 120 180 mV 4.53 4.75 VSTBY-0.08 V 25 µA 0.4 1.0 V V RESET Hysteresis RESET Threshold Low (VRL) VSTBY Decreasing RESET Leakage Output Voltage Low (VRLO); RRST = 10k½ Low (VRPEAK) 1V ² VSTBY ² VRL VSTBY, Power Up, Power Down 0.1 0.6 ■ Protection Circuitry (Both Outputs) Independent Thermal Shutdown VSTBY VTRK Overvoltage Shutdown 150 150 180 165 30 34 ¡C ¡C 38 V Package Lead Description PACKAGE LEAD # 7L 7L TO-220 D2PAK 1 1 LEAD SYMBOL 16L PDIP & SO Wide (Internally Fused Leads) 16 20L SO Wide (Internally Fused Leads) 20 FUNCTION VSTBY Standby output voltage delivering 100mA. 2 2 1 1 VIN Input voltage. 3 3 3 2 VTRK Tracking output voltage controlled by ENABLE delivering 250mA. 4 4 4,5,12,13 Gnd Reference ground connection. 5 5 6 4,5,6,7 14,15,16,17 8 Adj 6 6 8 10 ENABLE Resistor divider from VTRK to Adj. Sets the output voltage on VTRK. If tied to VTRK, VTRK will track VSTBY. Provides on/off control of the tracking output, active LOW. 7 7 9 11 RESET CMOS compatible output lead that goes low whenever VSTBY falls out of regulation. 2,7,10, 11,14,15 3,9,12,13, 18,19 NC No Connection. 3 CS8361 Circuit Description ENABLE Function VTRK Output Voltage The ENABLE function switches the output transistor for VTRK on and off. When the ENABLE lead voltage exceeds 1.4V(typ), VTRK turns off. This input has several hundred millivolts of hysteresis to prevent spurious output activity during power-up or power-down. This output uses the same type of output device as VSTBY, but is rated for 250mA. The output is configured as a tracking regulator of the standby output. By using the standby output as a voltage reference, giving the user an external programming lead (Adj lead), output voltages from 5V to 20V are easily realized. The programming is done with a simple resistor divider (Figure 2), and following the formula: RESET Function VTRK = VSTBY ´ (1 + R1/R2) + IAdj ´ R1 The RESET is an open collector NPN transistor, controlled by a low voltage detection circuit sensing the VSTBY (5V) output voltage. This circuit guarantees the RESET output stays below 1V (0.1V typ) when VSTBY is as low as 1V to ensure reliable operation of microprocessor-based systems. If another 5V output is needed, simply connect the Adj lead to the VTRK output lead. Application Notes IOUT2(max) is the maximum output current, for the application External Capacitors Output capacitors for the CS8361 are required for stability. 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. Worstcase is determined at the minimum ambient temperature and maximum load expected. IQ is the quiescent current the regulator consumes at IOUT(max). Once the value of PD(max) is known, the maximum permissible value of RQJA can be calculated: 150¡C - TA RQJA = (2) PD The value of RQJA can then be compared with those in the package section of the data sheet. Those packages with RQJA's less than the calculated value in equation 2 will keep the die temperature below 150¡C. 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. In some cases, none of the packages will be sufficient to dissipate the heat generated by the IC, and an external heat sink will be required. Capacitors must also be rated at all ambient temperatures expected in the system. To maintain regulator stability down to -40ûC, capacitors rated at that temperature must be used. More information on capacitor selection for Smart Regulatorsª is available in the Smart Regulator application note, ÒCompensation for Linear Regulators.Ó IIN Smart Regulator VIN IOUT1 VOUT1 IOUT2 Calculating Power Dissipation in a Dual Output Linear Regulator VOUT2 } The maximum power dissipation for a dual output regulator (Figure 1) is: PD(max) = {VIN(max)ÐVOUT1(min)}IOUT1(max)+ {VIN(max)ÐVOUT2(min)}IOUT2(max)+VIN(max)IQ Control Features IQ (1) Where VIN(max) is the maximum input voltage, Figure 1: Dual output regulator with key performance parameters labeled. 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 4 where: RQJC = the junctionÐtoÐcase thermal resistance, RQCS = the caseÐtoÐheat sink thermal resistance, and RQSA = the heat sinkÐtoÐambient thermal resistance. 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. RQJC appears in the package section of the data sheet. Like RQJA, it too is a function of package type. RQCS and RQSA are functions of the package type, heat sink and the interface between them. These values appear in heat sink data sheets of heat sink manufacturers. 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 RQJA: RQJA = RQJC + RQCS + RQSA (3) Test & Application Circuits B+ 0.1µF C1* 5V, 100mA VSTBY VIN VDD C2** R3 CS8361 10µF ESR<8Ω MCU RESET RESET ENABLE I/O R2 Adj R1 SW 8V, 250mA VTRK Gnd C3** Gnd 10µF ESR<8Ω VTRK ~ VSTBY (1 + R1/R2) For VTRK ~ 8V, R1/R2 ~ 0.6 * C1 is required if regulator is located far from power supply filter. ** C2 and C3 are required for stability. Figure 2: 5V, 8V Regulator B+ VIN 0.1µF C1* 5V, 100mA VSTBY VDD R1 CS8361 C2** 10µF ESR<8Ω MCU RESET RESET ENABLE I/O Adj Gnd SW 5V, 250mA VTRK C3** 10µF ESR<8Ω * C1 is required if regulator is located far from power supply filter. ** C2 and C3 are required for stability. Figure 3: Dual 5V Regulator 5 Gnd CS8361 Application Notes: continued CS8361 Package Specification PACKAGE DIMENSIONS IN mm(INCHES) PACKAGE THERMAL DATA D Lead Count Metric Max Min 19.69 18.67 10.50 10.10 13.00 12.60 16L PDIP 16L SO Wide* 20L SO Wide* Thermal Data English Max Min .775 .735 .413 .398 .512 .496 7L 7L TO-220 16L PDIP 16L SO Wide* 20L SO Wide* 7 Lead D2PAK (DPS)* Short-Leaded 1.68 (.066) 1.40 (.055) typ D2PAK RQJA RQJC 10-50** 3.5 3.5 42 18 9 50 80 75 55 ûC/W ** Depending on thermal properties of substrate. RQJA = RQJC + RQCA 1.40 (.055) 1.14 (.045) 10.31 (.406) 10.05 (.396) 7 Lead TO-220 (T) Straight 8.53 (.336) 8.28 (.326) 2.79 (.110) 2.54 (.100) 14.71 (.579) 13.69 (.539) 10.54 (.415) 9.78 (.385) 1.98 (.078) 1.47 (.058) 0.91 (.036) 0.66 (.026) TERMINAL 8 1.27 (.050) REF 1.40 (.055) 1.14 (.045) 4.83 (.190) 4.06 (.160) 2.87 (.113) 2.62 (.103) .254 (.010) REF 6.50 (.256) REF 6.55 (.258) 5.94 (.234) 14.99 (.590) 14.22 (.560) 3.96 (.156) 3.71 (.146) 4.57 (.180) 4.31 (.170) 7.75 (.305) REF 0.10 (.004) 0.00 (.000) 14.22 (.560) 13.72 (.540) 0.94 (.037) 0.58 (.023) *CHERRY SEMICONDUCTOR SHORT-LEADED FOOTPRINT Surface Mount Wide Body (DW); 300 mil wide 1.40 (.055) 1.14 (.045) 7.60 (.299) 7.40 (.291) 0.56 (.022) 0.36 (.014) 0.64 (.025) 0.38 (.015) 7.75 (.305) 7.49 (.295) 10.65 (.419) 10.00 (.394) 2.92 (.115) 2.29 (.090) Plastic DIP (N); 300 mil wide 0.51 (.020) 0.33 (.013) 1.27 (.050) BSC 7.11 (.280) 6.10 (.240) 2.49 (.098) 2.24 (.088) 1.27 (.050) 0.40 (.016) 2.65 (.104) 2.35 (.093) 8.26 (.325) 7.62 (.300) 0.32 (.013) 0.23 (.009) D REF: JEDEC MS-013 1.77 (.070) 1.14 (.045) 2.54 (.100) BSC 3.68 (.145) 2.92 (.115) 0.30 (.012) 0.10 (.004) Ordering Information Part Number CS8361YDPS7 CS8361YDPSR7 CS8361YT7 CS8361YDWF16 CS8361YDWFR16 CS8361YN16 CS8361YDW20 CS8361YDWR20 Rev. 5/4/99 Description 7L D2PAK short-leaded 7L D2PAK short-leaded, (tape & reel) 7L TO-220 (Straight) 16L SO Wide* 16L SO Wide*, (tape & reel) 16L PDIP 20L SO Wide* 20L SO Wide*, (tape & reel) .356 (.014) .203 (.008) 0.39 (.015) MIN. .558 (.022) .356 (.014) REF: JEDEC MS-001 D Some 8 and 16 lead packages may have 1/2 lead at the end of the package. All specs are the same. * Internally Fused Leads Cherry Semiconductor Corporation reserves the right to make changes to the specifications without notice. Please contact Cherry Semiconductor Corporation for the latest available information. 6 © 1999 Cherry Semiconductor Corporation