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MAX8650 Datasheet(PDF) 3 Page - Maxim Integrated Products |
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MAX8650 Datasheet(HTML) 3 Page - Maxim Integrated Products |
3 / 25 page 4.5V to 28V Input Current-Mode Step-Down Controller with Adjustable Frequency _______________________________________________________________________________________ 3 ELECTRICAL CHARACTERISTICS (continued) (VIN = 12V, VBST - VLX = 6.5V, TA = -40°C to +85°C. Typical values are at TA = +25°C, unless otherwise noted.) (Note 1) PARAMETER CONDITIONS MIN TYP MAX UNITS ERROR AMPLIFIER REFIN = AVL 0.693 0.7 0.707 FB Regulation Voltage VREFIN = 0.7V to 1.5V VREFIN - 0.00375 VREFIN VREFIN + 0.00375 V Transconductance 70 110 160 µS COMP Shutdown Resistance From COMP to GND, VEN = 0V 20 100 Ω FB Input Leakage Current VFB = 0.7V 5 50 nA FB Input Common-Mode Range -0.1 +1.5 V CURRENT-SENSE AMPLIFIER Voltage Gain VOUT = 0 to 5.5V, VCS+ - VCS- = 30mV 12 V/V CURRENT LIMIT RILIM1 = 24k Ω 27.2 32.0 36.8 Peak Current-Limit Threshold (VCS+ - VCS-) ILIM1 = AVL 68.0 80.0 92.0 mV RILIM2 = 50k Ω -42.5 -50.0 -57.5 Valley Current-Limit Threshold (VLX - VPGND) RILIM2 = 200k Ω -170 -200 -230 mV Negative Current-Limit Threshold % of (typ) positive direction current limit (VLX - VPGND) -90 -120 -150 % CS+, CS- Input Current VCS+ = VCS- = 0V or 5.5V -25 +25 µA CS+, CS- Input Common-Mode Range 0 5.5 V SLOPE COMPENSATION VSCOMP = 2.5V 231.25 250.00 268.75 VSCOMP = 1.25V 113.77 123.00 132.23 SCOMP = AVL 231.25 250.00 268.75 SCOMP = GND, TA = 0°C to +85°C 113.77 123.00 132.23 Slope Compensation at Maximum Duty Cycle TA = -40°C to +85°C 110.70 123.00 132.23 mV SCOMP High Threshold VAVL - 0.5 V SCOMP Low Threshold 0.5 V SCOMP Adjustment Range 1.25 2.5 V SCOMP Input Leakage Current VSCOMP = 1.25V to 2.5V 5 200 nA OSCILLATOR RFSYNC = 21.0k Ω 800 1000 1200 Switching Frequency RFSYNC = 143k Ω 160 200 240 kHz Minimum Off-Time Measured at DH 235 ns Minimum On-Time Measured at DH 75 100 ns |
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