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MAX77756 Datasheet(PDF) 4 Page - Maxim Integrated Products |
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MAX77756 Datasheet(HTML) 4 Page - Maxim Integrated Products |
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4 / 34 page  (VSUP = VEN = 12V, VIO = 1.8V, VIN1 = VIN2 = 0V, configuration registers in reset. Limits are 100% production tested at TA = +25°C, limits over TA = -40°C to +85°C are guaranteed by design and characterization, unless otherwise noted.) PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS FB VOLTAGE ACCURACY FB Voltage Accuracy VFB External feedback version VSUP = 12V, ILOAD = 250mA, TA = +25°C 0.99 1 1.01 V VSUP = 3.0V to 24V, ILOAD = 0mA to 500mA, TA = -40°C to +85°C 0.97 1 1.03 FB Input Current IFB VFB = 1V, external feedback version 0.02 µA OUT/FB Wake-Up Threshold VWAKE Standby mode exit threshold, ILOAD = 0mA, expressed as a percentage of VOUT-REG 99 % OUT/FB Load Regulation 0 to 300mA load, FPWM mode (Note 2) 1 % OUT/FB Line Regulation VSUP = 4.5V to 24V, VOUT = 3.3V, FPWM mode (Note 2) 0.02 %/VSUP OUT/FB Soft-Start Ramp Time tSS SOFT_ST = 1 4 ms SOFT_ST = 0 8 High-Side MOSFET On-Resistance RON-HS VBIAS = 5V, ILX = 90mA 500 800 mΩ Low-Side MOSFET On-Resistance RON-LS VBIAS = 5V, ILX = 90mA 500 800 mΩ High-Side MOSFET Peak Current Limit ILX-PEAK I_PEAK[1:0] = 0b00 700 mA I_PEAK[1:0] = 0b01 800 I_PEAK[1:0] = 0b10 800 900 1000 I_PEAK[1:0] = 0b11 1000 Low-Side MOSFET Valley Current Threshold ILX-VALLEY Output overloaded (VOUT < 25% of VOUT- REG), threshold below where on-times are allowed to start 500 mA High-Side MOSFET Minimum Current Threshold ILX-PK-MIN Inductor current ramps to at least ILX-PK-MIN while skipping 200 mA Low-Side MOSFET Zero-Crossing Threshold IZX 40 mA Minimum On-Time (Note 3) tON-MIN VOUT = 3.3V 80 ns Maximum Duty Cycle DMAX 99 % Switching Frequency fSW Continuous conduction 0.94 1 1.06 MHz Spread-Spectrum Frequency Range ∆fSW Spread-spectrum enabled ±6 % Electrical Characteristics (continued) www.maximintegrated.com Maxim Integrated │ 4 MAX77756 24V Input, 500mA Buck Regulator with Dual-Input Power MUX |
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