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MAX1992ETG Datasheet(PDF) 3 Page - Maxim Integrated Products |
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MAX1992ETG Datasheet(HTML) 3 Page - Maxim Integrated Products |
3 / 36 page Quick-PWM Step-Down Controllers with Inductor Saturation Protection and Dynamic Output Voltages _______________________________________________________________________________________ 3 ELECTRICAL CHARACTERISTICS (continued) (V+ = 15V, VCC = VDD = SHDN = 5V, SKIP = GND, TA = 0°C to +85°C, unless otherwise noted. Typical values are at TA = +25°C.) PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS TON = GND (600kHz) 170 194 219 TON = REF (450kHz) 213 243 273 TON = open (300kHz) 316 352 389 On-Time tON V+ = 15V, VOUT = 1.5V (Note 3) TON = VCC (200kHz) 461 516 571 ns Minimum Off-Time tOFF(MIN) (Note 3) 400 500 ns FB forced above the regulation point, LSAT = GND 0.55 0.85 Quiescent Supply Current (VCC) ICC FB forced above the regulation point, VLSAT > 0.5V 1 mA Quiescent Supply Current (VDD) IDD FB forced above the regulation point <1 5 µA Quiescent Supply Current (V+) IV+ 25 40 µA Shutdown Supply Current (VCC) SHDN = GND <1 7 µA Shutdown Supply Current (VDD) SHDN = GND <1 5 µA Shutdown Supply Current (V+) SHDN = GND, V+ = 28V, VCC = VDD = 0 or 5V <1 5 µA REFERENCE TA = +25°C to +85°C 1.986 2 2.014 Reference Voltage VREF VCC = 4.5V to 5.5V, IREF = 0 TA = 0°C to +85°C 1.983 2 2.017 V Reference Load Regulation ΔVREF IREF = -10µA to 50µA -0.01 +0.01 V REF Lockout Voltage VREF(UVLO) Rising edge, hysteresis = 350mV 1.95 V REFIN Voltage Range 0.7 VREF V REFIN Input Bias Current IREFIN 0.01 0.05 µA FAULT DETECTION Overvoltage Trip Threshold With respect to error comparator threshold, OVP/UVP = VCC 12 16 20 % Overvoltage Fault Propagation Delay tOVP FB forced 2% above trip threshold 10 µs Output Undervoltage Protection Trip Threshold With respect to error comparator threshold, OVP/UVP = VCC 65 70 75 % Output Undervoltage Protection Blanking Time tBLANK From rising edge of SHDN 10 35 ms Output Undervoltage Fault Propagation Delay tUVP 10 µs PGOOD Lower Trip Threshold With respect to error comparator threshold, hysteresis = 1% -13 -10 -7 % PGOOD Upper Trip Threshold With respect to error comparator threshold, hysteresis = 1% +7 +10 +13 % PGOOD Propagation Delay tPGOOD FB forced 2% beyond PGOOD trip threshold 10 µs |
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