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MAX1818 Datasheet(PDF) 6 Page - Maxim Integrated Products |
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MAX1818 Datasheet(HTML) 6 Page - Maxim Integrated Products |
6 / 9 page 500mA Low-Dropout Linear Regulator in SOT23 6 _______________________________________________________________________________________ Additional blocks include an output current limiter, ther- mal sensor, and shutdown logic. Internal P-Channel Pass Transistor The MAX1818 features a 0.25 Ω P-channel MOSFET pass transistor. Unlike similar designs using PNP pass transistors, P-channel MOSFETs require no base drive, which reduces quiescent current. PNP-based regula- tors also waste considerable current in dropout when the pass transistor saturates, and use high base-drive currents under large loads. The MAX1818 does not suf- fer from these problems and consumes only 125µA of quiescent current under heavy loads as well as in dropout. Output Voltage Selection The MAX1818’s Dual Mode operation allows operation in either a preset voltage mode or an adjustable mode. Connect SET to GND to select the preset output volt- age. The two-digit part number suffix identifies the out- put voltage (see Selector Guide). For example, the MAX1818EUT33 has a preset 3.3V output voltage. The output voltage may also be adjusted by connecting a voltage-divider from OUT to SET to GND (Figure 2). Select R2 in the 25k Ω to 100kΩ range. Calculate R1 with the following equation: R1 = R2 [(VOUT / VSET) – 1] where VSET = 1.25V, and VOUT may range from 1.25V to 5.0V. Shutdown Pull SHDN low to enter shutdown. During shutdown, the output is disconnected from the input and supply cur- rent drops to 0.1µA. When in shutdown, POK pulls low and OUT is high impedance. The capacitance and load at OUT determine the rate at which VOUT decays. SHDN can be pulled as high as 6V, regardless of the input and output voltage. 100mV SHDN IN POK ON OFF CIN 1 µF VIN = 2.5V TO 5.5V OUT VOUT = 1.25V TO 5.0V COUT 3.3 µF THERMAL SENSOR SET MOSFET DRIVER WITH I LIM SHUTDOWN LOGIC VREF 1.25V ERROR AMPLIFIER GND R1 R2 RPOK 100k LOGIC SUPPLY VOLTAGE (VOUT) 93% VREF TO µC 5k MAX1818 Figure 1. Functional Diagram |
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Similar Description - MAX1818 |
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