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## MAX6765 Datasheet(PDF) 17 Page - Maxim Integrated Products

 Part No. MAX6765 Description Automotive Micropower Linear Regulators with Supervisor Download 22 Pages Scroll/Zoom 100% Manufacturer MAXIM [Maxim Integrated Products] Direct Link https://www.maximintegrated.com/en.html Logo

## MAX6765 Datasheet(HTML) 17 Page - Maxim Integrated Products

 17 / 22 pageAutomotive Micropower Linear Regulatorswith Supervisor______________________________________________________________________________________17Available Output-Current CalculationThe MAX6765–MAX6774B provide up to 100mA of loadcurrent. Package power dissipation limits the amount ofoutput current available for a given input/output voltageand ambient temperature. Figures 3 and 4 depict themaximum power dissipation curve for the MAX6765/MAX6766 and MAX6767–MAX6774B, respectively. Thegraph assumes that the exposed metal pad of thedevice package is soldered to a solid 1in2 section of2oz. PCB copper (JESD51-3 AND JESD51-5). UseFigure 4 to determine the allowable package dissipa-tion for a given ambient temperature. Alternately, usethe following formula to calculate the allowable pack-age dissipation:PDMAX = Max. Power Dissip = 1.951W, for TA ≤ +70°CPDMAX = Max. Power Dissip = [1.9W - 0.0244W x(TA - 70°C)], for +70°C < TA ≤ +125°Cwhere 0.0244W is the MAX6767–MAX6774B packagethermal derating in W/°C and TA is the ambient tempera-ture in °C, under the same conditions used for Figure 4.After determining the allowable package dissipation,calculate the maximum output current using the follow-ing formula:PD < PDMAX where PD = [(VIN - VOUT) x IOUT]Also, IOUT should be ≤ 100mA in any case.Selecting Timeout CapacitorThe reset timeout period is adjustable to accommodatea variety of µP applications. Adjust the reset timeoutperiod by connecting a capacitor between TIMEOUTand GND.tRP = CTIMEOUT x 1.22 x 106Ω (L/M/T/S options)tRP = CTIMEOUT x 1.17 x 106Ω (V/W/Y/Z options)where tRP is in seconds and CTIMEOUT is in Farads.Connect TIMEOUT to OUT to select the internally fixedtimeout period. CTIMEOUT must be a low-leakage(< 10nA) type capacitor. Ceramic capacitors arerecommended; do not use capacitor values lower than100pF to avoid the influence of parasitic capacitances.Capacitor Selection andRegulator StabilityFor stable operation over the full temperature range andwith load currents up to 100mA, use a 10µF (min) outputcapacitor with an ESR < 0.5Ω. To reduce noise andimprove load-transient response, stability, and power-supply rejection, use larger output-capacitor values.Some ceramic dielectrics exhibit large capacitanceand ESR variation with temperature. For dielectriccapacitors such as Z5U and Y5V, use more capaci-tance to ensure stability at low temperatures. With X7Ror X5R dielectrics, 10µF should be sufficient at all oper-ating temperatures. For higher-ESR tantalum capaci-tors, use larger capacitor values to maintain stability. Toimprove power-supply rejection and transientresponse, use a larger capacitor than the minimum0.1µF capacitor between IN and GND.TEMPERATURE (°C)140120801004060200.20.40.60.81.01.21.41.61.82.02.200160DERATE 23.8mW/°CABOVE +70°C1.904WSAFE OPERATINGAREATEMPERATURE (°C)140120801004060200.20.40.60.81.01.21.41.61.82.02.200160DERATE 24.4mW/°CABOVE +70°C1.951WSAFE OPERATINGAREAFigure 3. Maximum Power Dissipation vs. Temperature(MAX6765/MAX6766)Figure 4. Maximum Power Dissipation vs. Temperature(MAX6767–MAX6774B)