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MAX8537 Datasheet(PDF) 2 Page - Maxim Integrated Products |
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MAX8537 Datasheet(HTML) 2 Page - Maxim Integrated Products |
2 / 23 page Dual-Synchronous Buck Controllers for Point-of- Load, Tracking, and DDR Memory Power Supplies 2 _______________________________________________________________________________________ ABSOLUTE MAXIMUM RATINGS Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only, and functional operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to absolute maximum rating conditions for extended periods may affect device reliability. V+ to GND ..............................................................-0.3V to +25V AVL, VL to GND........................................................-0.3V to +6V PGND to GND .......................................................-0.3V to +0.3V FB_, EN_, POK_ to GND...........................................-0.3V to +6V REFIN, VTTR, FREQ, SS_, COMP_ to GND....-0.3V to (AVL + 0.3V) BST_, ILIM_ to GND ...............................................-0.3V to +30V DH1 to LX1 ...............................................-0.3V to (BST1 + 0.3V) DH2 to LX2 ...............................................-0.3V to (BST2 + 0.3V) LX_ to BST_ ..............................................................-6V to +0.3V LX_ to GND................................................................-2V to +25V DL_ to PGND ................................................-0.3V to (VL + 0.3V) Continuous Power Dissipation (TA = +70°C) 28-Pin QSOP (derate 10.8mW/°C above +70°C)........860mW Operating Temperature Range ...........................-40°C to +85°C Junction Temperature ......................................................+150°C Storage Temperature Range .............................-65°C to +150°C Lead Temperature (soldering, 10s) ..........................……+300°C ELECTRICAL CHARACTERISTICS (V+ = 12V, EN_ = VL, BST_ = 6V, LX_ = 1V, VL load = 0mA, CVL = 10µF (ceramic), REFIN = 1.25V, PGND = AGND = FB_ = ILIM_ = 0V, CSS = 10nF, CVTTR = 1µF, RFREQ = 20kΩ, DH_ = open, DL_ = open, POK_ = open, circuit of Figure 1, TA = 0°C to +85°C, unless otherwise noted.) PARAMETER CONDITIONS MIN TYP MAX UNITS GENERAL V+ Operating Range VL regulator drops out below 5.5V (Note 1) 4.5 23.0 V V+/ VL Operating Range VL is externally generated (Note 1) 4.5 5.5 V V+ Operating Supply Current IL(VL) = 0, FB_ forced 50mV above threshold 3.5 7 mA V+ Standby Supply Current IL(VL) = 0, BST_ = VL, EN = LX_ = FB_ = 0V 350 700 µA VL REGULATOR Output Voltage 5.5V < V+ < 23V, 1mA < ILOAD < 70mA 4.75 5 5.25 V VL Undervoltage-Lockout Trip Level Rising edge, hysteresis = 550mV (typ) (trip level is typically 85% of VL) 4.18 4.3 4.42 V Output Current This is for gate current of DL_ /DH_ drivers, C(VL) = 1µF/10mA ceramic capacitor 70 mA Thermal Shutdown Rising temperature, typical hysteresis = 10°C +160 °C CURRENT-LIMIT THRESHOLD (all current limits are tested at V+ = VL = 4.5V and 5.5V) ILIM Sink Current ILIM_ = LX - 200mV, 1.8V < LX < 23V, BST = LX +5V 180 200 220 µA SOFT-START Soft-Start Source Current SS_ = 100mV -7 -5 -3 µA Soft-Start Sink Current SS_ = 0.8 or REFIN 3 5 7 µA Soft-Start Full-Scale Voltage 0.8 or REFIN V FREQUENCY Low End of Range RFREQ = 100kΩ, V+ = VL = 5V 160 200 240 kHz Intermediate Range RFREQ = 20kΩ, V+ = VL = 5V 800 1000 1200 kHz High End of Range RFREQ = 14.3kΩ, V+ = VL = 5V 1120 1400 1680 kHz RFREQ = 100kΩ 95 RFREQ = 20kΩ 80 Maximum Duty Cycle RFREQ = 14.3kΩ 72 % |
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