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MAX877 Datasheet(PDF) 3 Page - Maxim Integrated Products |
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MAX877 Datasheet(HTML) 3 Page - Maxim Integrated Products |
3 / 12 page 5V/3.3V/3V/Adjustable-Output, Step-Up/Step-Down DC-DC Converters _______________________________________________________________________________________ 3 ELECTRICAL CHARACTERISTICS (continued) (VIN = 2.7V, ILOAD = 0mA, LX = 22µH, COUT = 100µF, – S — H — D — N – and ILIM connected to IN, AGND connected to PGND, TA = TMIN to TMAX, typical values are at TA = +25°C, unless otherwise noted.) Note 2: Output in regulation, VOUT = VOUT (nominal) ±4%. Note 3: At high VIN to VOUT differentials, the maximum load current is limited by the maximum allowable power dissipation in the package (see Absolute Maximum Ratings and Maximum Output Current graphs in the Typical Operating Characteristics). Note 4: Minimum value is production tested. Maximum value is guaranteed by design and is not production tested. Note 5: VOUT is set to a target value of 5V by 0.1% external feedback resistors. VOUT is measured to be within 5V ±2.5% to guarantee error-comparator trip point. Note 6: Startup guaranteed under these load conditions. PARAMETER Maximum Switch On Time CONDITIONS MIN TYP MAX VIN = 1V 12.6 UNITS ISW = 400mA µs 0.275 MAX877/MAX879 Current-Limit Temperature Coefficient 1.3 -0.3 %/°C Current Limit 1.0 µs Minimum Switch Off Time ISW = 600mA 0.33 Switch Saturation Voltage ISW = 1000mA 0.50 V MAX878 2.3 µs ISW = 400mA VIN = 2.5V 4.0 0.21 VIN = 1.8V 5.9 ISW = 600mA 0.31 Rectifier Forward Voltage Drop – S — H — D — N – Threshold ISW = 1000mA 0.50 V VIN = 1V to 6.2V VIN/2 +0.25 Error-Comparator Trip Point (VREF) MAX879, VIN = 1.8V to 5V (Note 5) 197.5 202.5 207.5 mV FB Pin Bias Current VIN = 2.7V 1.3 1.7 MAX879 10 40 nA Switch Off Leakage Current – S — H — D — N – Enable Delay 0.1 150 Rectifier Off Leakage Current 0.1 µA V A µA |
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