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MAX8863R Datasheet(PDF) 6 Page - Maxim Integrated Products |
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MAX8863R Datasheet(HTML) 6 Page - Maxim Integrated Products |
6 / 10 page Low-Dropout, 120mA Linear Regulators 6 _______________________________________________________________________________________ _______________Detailed Description The MAX8863/MAX8864 are low-dropout, low-quiescent- current linear regulators designed primarily for battery- powered applications. They supply an adjustable 1.25V to 6.5V output or a preselected 2.80V (MAX886_R), 2.84V (MAX886_S), or 3.15V (MAX886_T) output for load currents up to 120mA. As illustrated in Figure 1, these devices con- sist of a 1.25V reference, error amplifier, MOSFET driver, P- channel pass transistor, Dual Mode™ comparator, and internal feedback voltage divider. The 1.25V bandgap reference is connected to the error amplifier’s inverting input. The error amplifier compares this reference with the selected feedback voltage and amplifies the difference. The MOSFET driver reads the error signal and applies the appropriate drive to the P-channel pass transistor. If the feedback voltage is lower than the refer- ence, the pass-transistor gate is pulled lower, allowing more current to pass and increasing 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 internal resistor voltage divider connected to the OUT pin, or an external resistor network connected to the SET pin. The Dual Mode comparator examines the SET voltage and selects the feedback path. If SET is below 60mV, internal feedback is used and the output voltage is regulated to the preset output voltage. Additional blocks include a current limiter, reverse battery protection, thermal sensor, and shut- down logic. SHUTDOWN LOGIC ERROR AMP 1.25V REF P N * OUT SET DUAL-MODE COMPARATOR 60mV * AUTO-DISCHARGE, MAX8864 ONLY GND IN SHDN MAX8863 MAX8864 MOS DRIVER WITH ILIMIT THERMAL SENSOR REVERSE BATTERY PROTECTION ______________________________________________________________Pin Description Active-Low Shutdown Input. A logic low reduces the supply current to 0.1nA. On the MAX8864, a logic low also causes the output voltage to discharge to GND. Connect to IN for normal operation. SHDN 1 PIN FUNCTION NAME GND 2 Ground. This pin also functions as a heatsink. Solder to large pads or the circuit board ground plane to max- imize thermal dissipation. 3 Regulator Input. Supply voltage can range from +2.5V to +6.5V. Bypass with 1µF to GND (see Capacitor Selection and Regulator Stability). OUT 4 Regulator Output. Fixed or adjustable from 1.25V to +6.5V. Sources up to 120mA. Bypass with a 1µF, <0.2 Ω typical ESR capacitor to GND. IN SET 5 Feedback Input for Setting the Output Voltage. Connect to GND to set the output voltage to the preset 2.80V (MAX886_R), 2.84V (MAX886_S), or 3.15V (MAX886_T). Connect to an external resistor divider for adjustable-output operation. Figure 1. Functional Diagram |
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