MAX8515EXK+TG002

19-2528; Rev 1; 2/03 KIT ATION EVALU E L B A AVAIL Wide-Input 0.6V Shunt Regulators for Isolated DC-to-DC Converters Features ♦ MAX8515A 0.6V ±0.5% Initial Accuracy at +25°C 0.6V ±1% Accuracy from -40°C to +85°C The MAX8515A features an initial output accuracy of 0.5% at +25°C and 1% from -40°C to +85°C and provides the output voltage regulation function for isolated DC-toDC converters. The MAX8515 features initial output accuracy of 1% at +25°C and 1.8% from -40°C to +85°C and can provide an output OVP function for isolated DCto-DC converters. High open-loop bandwidth allows design of high-bandwidth DC-to-DC converters. ♦ Space-Saving 5-Pin SC70 or SOT23 Packages Low-cost, low-dropout linear regulators can be designed with the MAX8515A/MAX8515 and an external NPN transistor for cost-conscious applications that do not require overcurrent, short-circuit, or overtemperature protection. The MAX8515/MAX8515A are available in space-saving 5-pin SC70 and SOT23 packages and are specified over the -40°C to +85°C extended temperature range. An evaluation kit is available to speed designs. Applications ♦ MAX8515 0.6V ±1% Initial Accuracy at +25°C 0.6V ±1.8% Accuracy from -40°C to +85°C ♦ Sinks 20mA at 0.2V to 18V ♦ Input Voltage Range from 1.7V to 28V ♦ Directly Drives Optocouplers ♦ 0.2Ω Dynamic Output Impedance Ordering Information PART TEMP RANGE PIN-PACKAGE MAX8515AEXK-T -40°C to +85°C 5 SC70-5 MAX8515AEZK-T -40°C to +85°C 5 Thin SOT23-5 MAX8515EXK-T -40°C to +85°C 5 SC70-5 MAX8515EZK-T -40°C to +85°C 5 Thin SOT23-5 Functional Diagram appears at end of data sheet. Selector Guide appears at end of data sheet. Isolated DC-to-DC Converters Network, Telecom, and Cellular Base Station Power Supplies Typical Operating Circuit Low-Dropout Linear Regulators INPUT SUPPLY INPUT 1.7V TO 28V 1.7V TO 18V Shunt Regulator Adjustable Voltage Reference PRIMARY SIDE PWM CONVERTER CONTROL VOLTAGE Pin Configuration TOP VIEW IN FB 5 MAX8515A MAX8515 N SC7 -PI 2.0 m OUT 3 4 IN 0 GND 2 5 mm PGND 1 m x 2.1 MAX8515A MAX8515 PGND GND OUT FB ISOLATED DC-DC CONVERTER OUTPUT (DOWN TO 0.6V) SC7O/THIN SOT23 ________________________________________________________________ Maxim Integrated Products For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct! at 1-888-629-4642, or visit Maxim’s website at www.maxim-ic.com. 1 MAX8515A/MAX8515 General Description The MAX8515A/MAX8515 shunt regulators simplify the design of voltage regulation and overvoltage protection (OVP) functions in high-accuracy isolated DC-to-DC converters with output voltages as low as 0.6V. The devices have supply voltage and feedback inputs separated from the output shunt stage, and can operate directly from the DC-to-DC converter output stage when the output voltage is 1.8V to 18V. Alternately, the MAX8515A/MAX8515 input stage can be biased from an unregulated 1.7V to 28V supply, independent of DC-to-DC converter output voltage. The MAX8515A/MAX8515 shunts 20mA when the output voltage is as low as 0.2V. MAX8515A/MAX8515 Wide-Input 0.6V Shunt Regulators for Isolated DC-to-DC Converters ABSOLUTE MAXIMUM RATINGS IN to GND ...............................................................-0.3V to +30V OUT to GND ...........................................................-0.3V to +20V FB to GND .................-0.3V to the lower of 5.5V and (VIN +0.3V) PGND to GND .......................................................-0.3V to +0.3V Continuous Power Dissipation (TA =+70°C) 5-Pin SC70 (derate 3.1mW/°C above +70°C) ...........246.9mW 5-Pin Thin SOT23 (derate 9.1mW/°C above +70°C) ....727mW Operating Temperature Range ...........................-40°C to +85°C Junction Temperature Range ............................-40°C to +150°C Storage Temperature Range .............................-65°C to +150°C Lead Temperature (soldering, 10s) .................................+300°C Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only, and functional operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to absolute maximum rating conditions for extended periods may affect device reliability. ELECTRICAL CHARACTERISTICS (VIN = 3.3V, OUT = FB, IOUT = 5mA, TA = -40°C to +85°C, unless otherwise noted. Typical values are at TA = +25°C.) (Note 1) PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS 28 V IN IN Voltage Range IN Supply Current VIN IIN 1.7 VIN = 2V to 28V IOUT = 0.3mA 0.5 1 IOUT = 10mA 2.5 4 mA FB TA = +25°C FB Threshold Accuracy TA = 0°C to +85°C TA = -40°C to +85°C FB Load Regulation FB Line Regulation 0.597 0.6 0.603 MAX8515E_K 0.594 0.6 0.606 MAX8515AE_K 0.595 0.6 0.605 MAX8515E_K 0.592 0.6 0.608 MAX8515AE_K 0.594 0.6 0.606 MAX8515E_K 0.589 0.6 0.608 IOUT = 1mA to 20mA 3.8 6 VIN = 2V to 28V 0.2 1 VIN = 1.7V to 28V FB Output Voltage Regulation FB Input Bias Current MAX8515AE_K 1.5 VOUT = 0.2V to 18V, IOUT = 1mA IFB(BIAS) VIN = 28V -0.1 V mV mV 0.2 1 mV 0.02 +0.1 µA OUT OUT Voltage Range VOUT 0.2 Maximum Output Current IOUT(MAX) VOUT = 0.2V, VIN = 2V, VFB = 0.63V Output Leakage Current IOUT(LEAK) Dynamic Output Impedance ZOUT VIN = 28V, VOUT = 18V, VFB = 0V 18 20 TA = +25°C 0.001 TA = +85°C 0.03 IOUT = 1mA to 20mA, f