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MAX1963ETT Datasheet(PDF) 6 Page - Maxim Integrated Products |
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MAX1963ETT Datasheet(HTML) 6 Page - Maxim Integrated Products |
6 / 12 page Detailed Description The MAX1963/MAX1976 are low-dropout, high-accuracy, low-quiescent-current linear regulators designed primarily for battery-powered applications. These devices supply loads up to 300mA and are available with preset output voltages from +0.75V to +3.0V. As illustrated in Figure 1, the MAX1963/MAX1976 consist of a reference, an error amplifier, a P-channel pass transistor, an internal feed- back voltage-divider, and a power-good comparator. The reference is connected to the error amplifier, which compares this reference with the feedback voltage and amplifies the difference. If the feedback voltage 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. Low-Input-Voltage, 300mA LDO Regulators with RESET in SOT and TDFN 6 _______________________________________________________________________________________ Pin Description PIN SOT23 TDFN NAME FUNCTION 16 IN Regulator Input. Supply voltage can range from +1.62V to +3.6V. Bypass IN with at least a 1µF ceramic capacitor to GND (see the Capacitor Selection and Regulator Stability section). 2 — GND Ground. GND also functions as a heatsink. Solder to a large pad or circuit-board ground plane to maximize SOT23 power dissipation. — 4 GND Ground 35 SHDN Active-Low Shutdown Input. A logic low reduces supply current to below 1µA. Connect to IN or logic high for normal operation. 43 RESET Open-Drain, Active-Low Reset Output. RESET rises 3.2ms (MAX1963) or 100ms (MAX1976) after the output has achieved regulation. RESET falls immediately if VOUT drops below 82.5% of its nominal voltage, or if the MAX1963/MAX1976 are shut down. 5 2 I.C. Internally Connected. Leave floating or connect to GND. 6 1 OUT Regulator Output. Sources up to 300mA. Bypass with a 4.7µF low-ESR ceramic capacitor to GND. — Exposed Pad EP Ground. EP also functions as a heatsink. Solder EP to a large pad or circuit-board ground plane to maximize TDFN power dissipation. MAX1963 MAX1976 IN GND SHDN SHUTDOWN LOGIC THERMAL SENSOR REF 82.5% REF TIMER ERROR AMP MOS DRIVER WITH ILIMIT OUT RESET P Figure 1. Functional Diagram |
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