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MAX8505 Datasheet(PDF) 5 Page - Maxim Integrated Products |
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MAX8505 Datasheet(HTML) 5 Page - Maxim Integrated Products |
5 / 15 page 3A, 1MHz, 1% Accurate, Internal Switch Step-Down Regulator with Power-OK _______________________________________________________________________________________ 5 Note 1: Under normal operating conditions, COMP moves between 1.25V and 2.15V as the duty cycle changes from 10% to 90% and peak inductor current changes from 0 to 3A. Maximum output current is related to peak inductor current, inductor value input voltage, and output voltage by the following equations: where VOUT = output voltage; ILIM = current limit of high-side switch; tS = switching period; RL = ESR of inductor; RNLS = on-resistance of low-side switch; L = inductor. Equations for ILIM and D are shown as follows: where ILIM_DC100 = current limit at D = 100%; RT = transresistance from LX to COMP; VSW = slope compensation (310mV ±20%); D = duty cycle: where VOUT = output voltage; VIN = input voltage; IO = output current; RL = ESR of inductor; RNHS = on-resistance of high- side switch; RNLS = on-resistance of low-side switch. See the Typical Application Circuit for external components. Note 2: Specifications to -40°C are guaranteed by design and not production tested. Note 3: LX has internal clamp diodes to PGND and IN pins 2 and 4. Applications that forward bias these diodes should take care not to exceed the IC’s package power dissipation limits. Note 4: When connected together, the LX output is designed to provide 3.5ARMS current. D VI R R VI R R OUT O NLS L IN O NLS NHS = ++ +− () () II V D R LIM LIM DC SW T =+ − _ 100 1 I ID t V L Dt R R L OUT MAX LIM S OUT S NLS L _ () / () ( ) / = −− × × +− × × + 12 11 2 ELECTRICAL CHARACTERISTICS (continued) (VIN = VCC = VCTL = +3.3V, VFB = 0.8V, VCOMP = 1.25V, CREF = 0.01µF, TA = -40°C to +85°C, unless otherwise noted.) (Note 2) PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS 500kHz 90 LX Maximum Duty Cycle VIN = VCC = 2.6V, 3.3V, 5.5V 1MHz 84 % 500kHz 8 LX Minimum Duty Cycle VIN = VCC = 2.6V, 3.3V, 5.5V 1MHz 15 % SLOPE COMPENSATION Slope Compensation Extrapolated to 100% duty cycle 245 406 mV BST VLX = 5.5V 10 VLX = 0V 10 BST Shutdown Supply Current (VBST - VLX) = VIN = VCC = 5.5V, VCTL = 0 LX open 10 µA CTL For 1MHz 80 For 500kHz 55 70 CTL Input Threshold VIN = VCC = 2.6V, 3.3V, 5.5V For shutdown 45 % of VCC CTL Input Current VCTL = 0V or 5.5V, VIN = VCC = 5.5V -1 +1 µA POK (Power-OK) POK Output Voltage, Low VFB = 0.6V or 1.0V, IPOK = 2mA 100 mV POK Leakage Current VPOK = 5.5V 1 µA POK Fault Delay Time From FB to POK, any threshold 25 100 µs |
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