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MAX1540A Datasheet(PDF) 6 Page - Maxim Integrated Products |
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MAX1540A Datasheet(HTML) 6 Page - Maxim Integrated Products |
6 / 49 page Dual Step-Down Controllers with Saturation Protection, Dynamic Output, and Linear Regulator 6 _______________________________________________________________________________________ Dual Mode is a trademark of Maxim Integrated Products, Inc. PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS Valley Current-Limit Threshold (Fixed) VLIM_ (VAL) VCSP_ - VCSN_, ILIM_ = VCC 45 50 55 mV VILIM_ = 250mV 15 25 35 Valley Current-Limit Threshold (Adjustable) VLIM_ (VAL) VCSP_ - VCSN_ VILIM_ = 2.00V 170 200 230 mV Current-Limit Threshold (Negative) VNEG VCSP_ - VCSN _, SKIP = ILIM_ = VCC, TA = +25°C -90 -65 -45 mV Current-Limit Threshold (Zero Crossing) VZX With respect to valley current-limit threshold, VCSP_ - VCSN _, SKIP = GND, ILIM_ = VCC 2.5 mV LSAT = VCC 180 200 220 LSAT = open 157 175 193 Inductor-Saturation Current-Limit Threshold With respect to valley current- limit threshold, ILIM_ = VCC LSAT = REF 135 150 165 % ILIM_ Saturation Fault Sink Current IILIM_ (LSAT) VCSP - VCSN > inductor saturation current limit, 0.25V < VILIM_ < 2.0V 468 µA ILIM_ Leakage Current VCSP_ - VCSN _ < inductor saturation current limit 0.1 µA GATE DRIVERS DH_ Gate-Driver On-Resistance RDH BST_-LX_ forced to 5V 1.5 5 Ω DL_, high state 1.5 5 DL_ Gate-Driver On-Resistance RDL DL_, low state 0.6 3 Ω DH_ Gate-Driver Source/Sink Current IDH DH_ forced to 2.5V, BST_-LX_ forced to 5V 1 A DL_ Gate-Driver Source Current IDL (SOURCE) DL_ forced to 2.5V 1 A DL_ Gate-Driver Sink Current IDL (SINK) DL_ forced to 2.5V 3 A DL_ rising 35 Dead Time tDEAD DH_ rising 26 ns INPUTS AND OUTPUTS OD On-Resistance ROD GATE = VCC 10 25 Ω OD Leakage Current GATE = GND, OD forced to 5.5V 1 200 nA Logic Input Threshold ON1, ON2, SKIP, GATE rising edge, hysteresis = 225mV 1.2 1.7 2.2 V LDOON Input Trip Level Rising edge, hysteresis = 250mV 1.20 1.25 1.30 V Logic Input Current ON1, ON2, LDOON, SKIP, GATE -1 +1 µA High 1.9 2.0 2.1 Dual Mode™ Threshold Voltage FB1 (MAX1540A), FB2 (MAX1540A/ MAX1541) Low 0.05 0.1 0.15 V ELECTRICAL CHARACTERISTICS (continued) (V+ = 15V, VCC = VDD = ON1 = ON2 = 5V, SKIP = GND, LDOIN (MAX1541) = V+, TA = 0°C to +85°C, unless otherwise noted. Typical values are at TA = +25 °C.) |
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