MAX8505

MAX8505 6m 19-2992; Rev 1; 9/10 EVAALVUAAILTAIOBNLEKIT 16-QSOP 3A, 1MHz, 1% Accurate, Internal Switch Step-Down Regulator with Power-OK m m x 4.9m General Description The MAX8505 step-down regulator operates from a 2.6V to 5.5V input and generates an adjustable output voltage from 0.8V to 0.85  VIN at up to 3A. With a 2.6V to 5.5V bias supply, the input voltage can be as low as 2.25V. The MAX8505 integrates power MOSFETs and operates at 1MHz/500kHz switching frequency to provide a compact design. Current-mode pulse-widthmodulated (PWM) control simplifies compensation with ceramic or polymer output capacitors and provides excellent transient response. The MAX8505 features 1% accurate output over load, line, and temperature variations. Adjustable soft-start is achieved with an external capacitor. During the soft-start period, the voltage-regulation loop is active. This limits the voltage dip when the active devices, such as microprocessors or ASICs connected to the MAX8505’s output, apply a sudden load current step upon passing their undervoltage thresholds. The MAX8505 features current-limit, short-circuit, and thermal-overload protection and enables a rugged design. Open-drain power-OK (POK) monitors the output voltage. Features o Saves Space—4.9mm x 6mm Footprint, 1µH Inductor, 47µF Ceramic Output Capacitor o Input Voltage Range 2.6V to 5.5V Down to 2.25V with Bias Supply o 0.8V to 0.85  VIN, 3A Output o Ceramic or Polymer Capacitors o ±1% Output Accuracy Over Lo...