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MAX1792 Datasheet(PDF) 7 Page - Maxim Integrated Products |
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MAX1792 Datasheet(HTML) 7 Page - Maxim Integrated Products |
7 / 10 page Detailed Description The MAX1792 is a low-dropout, low-quiescent-current linear regulator designed primarily for battery-powered applications. The device supplies loads up to 500mA and is available with preset output voltages. As illustrat- ed in Figure 1, the MAX1792 consists of a 1.25V refer- ence, error amplifier, P-channel pass transistor, and internal feedback voltage-divider. The 1.25V reference is connected to the error amplifier, which compares this reference with the feedback volt- age and amplifies the difference. If the feedback volt- age is lower than the reference voltage, the pass-transistor gate is pulled lower, which allows more current to pass to the output and increases the output voltage. If the feedback voltage is too high, the pass- transistor gate is pulled up, allowing less current to pass to the output. The output voltage is fed back through either an inter- nal resistive divider connected to OUT or an external resistor network connected to SET. The Dual Mode comparator examines VSET and selects the feedback path. If VSET is below 50mV, the internal feedback path is used and the output is regulated to the factory-preset voltage. Additional blocks include an output current limiter, ther- mal sensor, and shutdown logic. Internal P-Channel Pass Transistor The MAX1792 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. 500mA Low-Dropout Linear Regulator in µMAX _______________________________________________________________________________________ 7 100mV SHDN IN IN RST ON OFF CIN 1 μF VIN = +2.5V TO +5.5V OUT OUT VOUT = 1.25V TO 5.0V COUT 3.3 μF THERMAL SENSOR SET MOSFET DRIVER WITH I LIM DELAY TIMER SHUTDOWN LOGIC VREF 1.25V ERROR AMPLIFIER GND R1 R2 RRST 100k LOGIC SUPPLY VOLTAGE (VOUT) 93% VREF TO μC 5k MAX1792 Figure 1. Functional Diagram |
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