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MAX1927REUB Datasheet(PDF) 3 Page - Maxim Integrated Products |
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MAX1927REUB Datasheet(HTML) 3 Page - Maxim Integrated Products |
3 / 12 page Low-Output-Voltage, 800mA, PWM Step-Down DC-DC Converters _______________________________________________________________________________________ 3 ELECTRICAL CHARACTERISTICS (continued) (VBATT = 3.6V, SHDN = BATT, CREF = 0.1µF, TA = 0°C to +85°C, unless otherwise noted. Typical values are at TA = +25°C.) PARAMETER CONDITIONS MIN TYP MAX UNITS N-Channel Synchronous Rectifier Turn-Off Threshold 20 mA LX Leakage Current VBATT = 5.5V, LX = GND or BATT -20 0.1 +20 µA Maximum Duty Cycle 100 % PWM = GND 0 Minimum Duty Cycle PWM = BATT 15 % Internal Oscillator Frequency 0.85 1 1.15 MHz Thermal Shutdown Threshold 15°C hysteresis 160 Degrees POK COMPARATOR BATT Operating Voltage Range IPOK = 0.1 mA 1 5.5 V Output Low Voltage VFB = 0.5V, IPOK = 1mA 0.01 0.1 V Output High Leakage Current VPOK = 5.5V 1 µA MAX1927R 0.650 0.675 0.700 MAX1928-15 1.305 1.350 1.395 MAX1928-18 1.566 1.620 1.674 POK Threshold MAX1928-25 2.175 2.250 2.325 V Output Valid to POK Release Delay POK transitions to high impedance 20ms after VFB > VPOK 15 20 25 ms LOGIC INPUTS (SHDN, PWM) Logic Input High 2.6V < VBATT < 5.5 V 1.6 V Logic Input Low 2.6V < VBATT < 5.5 V 0.6 V Logic Input Current VBATT = 5.5V 0.1 1 µA ELECTRICAL CHARACTERISTICS (VBATT = 3.6V, SHDN = BATT, CREF = 0.1µF, TA = -40°C to +85°C, unless otherwise noted.) PARAMETER CONDITIONS MIN MAX UNITS BATT Input Voltage 2.6 5.5 V Undervoltage Lockout Threshold VBATT rising or falling (35mV hysteresis) 2.15 2.55 V Quiescent Current No load, pulse skipping, PWM = GND 240 µA Quiescent Current in Dropout 340 µA Shutdown Supply Current SHDN = GND 10 µA REFERENCE AND ERROR AMP MAX1927R 0.732 0.768 MAX1928-15 1.47 1.53 MAX1928-18 1.764 1.836 FB Voltage Accuracy MAX1928-25 2.45 2.55 V FB Input Current MAX1928 5 15 µA |
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