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MAX1537ETX Datasheet(PDF) 3 Page - Maxim Integrated Products |
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MAX1537ETX Datasheet(HTML) 3 Page - Maxim Integrated Products |
3 / 38 page High-Efficiency, 5x Output, Main Power-Supply Controllers for Notebook Computers _______________________________________________________________________________________ 3 ELECTRICAL CHARACTERISTICS (continued) (Circuit of Figure 1, VIN = 12V, both SMPS enabled, VCC = 5V, FSEL = REF, SKIP = GND, VILIM_ = VLDO5, VINA = 15V, VLDOA = 12V, ILDO5 = ILDO3 = ILDOA = no load, TA = 0°C to +85°C, unless otherwise noted. Typical values are at TA = +25°C.) PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS Line-Regulation Error Either SMPS, duty cycle = 10% to 90% 1 % FSEL = GND 170 200 230 FSEL = REF 270 300 330 Operating Frequency (Note 1) fOSC FSEL = VCC 425 500 575 kHz FSEL = GND 91 93 FSEL = REF 91 93 Maximum Duty Factor (Note 1) DMAX FSEL = VCC 91 93 % Minimum On-Time tON(MIN) (Note 3) 200 ns 40 % SMPS3 to SMPS5 Phase Shift SMPS5 starts after SMPS3 144 Deg CURRENT LIMIT ILIM_ Adjustment Range 0.5 VREF V Current-Sense Input Range CSH_, CSL_ 0 5.5 V Current-Sense Input Leakage Current CSH_, VCSH_ = 5.5V -1 +1 µA Current-Limit Threshold (Fixed) VLIMIT_VCSH_ - VCSL_, ILIM_ = VCC 70 75 80 mV VILIM_ = 2.00V 170 200 230 VILIM_ = 1.00V 91 100 109 Current-Limit Threshold (Adjustable) VLIMIT_ VCSH_ - VCSL_ VILIM_ = 0.50V 42 50 58 mV Current-Limit Threshold (Negative) VNEG VCSH_ - VCSL_, SKIP = VCC, percent of current limit -120 % Current-Limit Threshold (Zero Crossing) VZX VPGND - VLX_, SKIP = GND, ILIM_ = VCC 3mV ILIM_ = VCC 10 16 22 mV Idle-Mode ™ Threshold VIDLE VCSH_ - VCSL_ With respect to current- limit threshold (VLIMIT) 20 % ILIM_ Leakage Current ILIM3 = ILIM5 = GND or VCC -0.1 +0.1 µA Soft-Start Ramp Time tSS Measured from the rising edge of ON_ to full scale 512 / fOSC s INTERNAL FIXED LINEAR REGULATORS LDO5 Output Voltage VLDO5 ON3 = ON5 = GND, 6V < VIN < 26V, 0 < ILDO5 < 100mA 4.80 4.95 5.10 V LDO5 Undervoltage-Lockout Fault Threshold Rising edge, hysteresis = 1% 3.75 4.0 4.25 V LDO5 Bootstrap Switch Threshold Rising edge of CSL5, hysteresis = 1% 4.41 4.75 V LDO5 Bootstrap Switch Resistance LDO5 to CSL5, VCSL5 = 5V, ILDO5 = 50mA 0.75 3 Ω Idle Mode is a trademark of Maxim Integrated Products, Inc. |
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