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MAX8532 Datasheet(PDF) 5 Page - Maxim Integrated Products |
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MAX8532 Datasheet(HTML) 5 Page - Maxim Integrated Products |
5 / 8 page Low-Noise, Low-Dropout, 200mA Linear Regulator in UCSP _______________________________________________________________________________________ 5 Detailed Description The MAX8532 is a low-power, low-dropout, low-quies- cent current linear regulator designed primarily for bat- tery-powered applications. For preset output voltages, see the Output Voltage Selector Guide. The device supplies up to 200mA for OUT. The MAX8532 consists of a 1.25V reference, error amplifier, P-channel pass transistor, reference bypass block, and internal feed- back voltage divider. The 1.25V bandgap reference is connected to the error amplifier’s inverting input. The error amplifier 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, allowing more current to pass to the output and increasing the output voltage. If the feedback voltage is high, the pass-transistor gate is pulled up, allowing less current to pass to the output. The output voltage is fed back through an internal resistor voltage-divider con- nected to the OUT pin. Shutdown The MAX8532 has a single shutdown control input (SHDN). Drive SHDN low to shut down the output, reducing supply current to 10nA. Connect SHDN to a logic-high, or IN, for normal operation. Internal P-Channel Pass Transistor The MAX8532 features a 1Ω P-channel MOSFET pass transistor. A P-channel MOSFET provides several advan- tages over similar designs using PNP pass transistors, including longer battery life. It requires no base drive, reducing quiescent current. PNP-based regulators waste considerable current in dropout when the pass transistor saturates and also use high base-drive currents under heavy loads. The MAX8532 does not suffer these prob- lems and consumes only 90µA quiecent current whether in dropout, light-load, or heavy-load applications (see the Typical Operating Characteristics). Whereas a PNP- based regulator has dropout voltage independent of the load, a P-channel MOSFET’s dropout voltage is propor- tional to load current, providing for low dropout voltage at heavy loads and extremely low dropout voltage at lighter loads. ERROR AMP IN SHDN GND OUT BP MOS DRIVER WITH ILIMIT THERMAL SENSOR 1.25V REF SHUTDOWN AND POWER-ON CONTROL MAX8532 Functional Diagram |
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