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MAX687 - High-Accuracy / Low-Dropout Linear Regulators

General Description

The MAX687/MAX688/MAX689 low-dropout linear regulators operate with an input-to-output voltage differential limited only by an external PNP transistor.

Outputs are fixed at 3.3V (MAX687/MAX688) or 3.0V (MAX689).

Key Features

  • o Fixed Outputs: 3.3V (MAX687/MAX688) 3.0V (MAX689) o Directly Drives External PNP Transistor o 10mA Min Base-Current Drive for >1A Output o Low Dropout Voltage: 100mV Dropout at 650mA Output (FZT749) 40mV Dropout at 200mA Output (FZT749) 0.8V Dropout at 4A Output o Power-Fail Output Monitors the Output Voltage o Automatic, Latched Shutdown when Output Falls Out of Regulation (MAX687) o Precision Threshold Shutdown Control (MAX688/MAX689) o Low Supply Current: 150µA Operating.

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Full PDF Text Transcription (Reference)

The following content is an automatically extracted verbatim text from the original manufacturer datasheet and is provided for reference purposes only.

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19-0329; Rev 0; 12/94 EVFAOLLULAOTWIOSNDKAITTAMSAHNEUEATL High-Accuracy, Low-Dropout Linear Regulators MAX687/MAX688/MAX689 _______________General Description The MAX687/MAX688/MAX689 low-dropout linear regulators operate with an input-to-output voltage differential limited only by an external PNP transistor. Outputs are fixed at 3.3V (MAX687/MAX688) or 3.0V (MAX689). The only external components required are a PNP pass transistor and output, compensation, and bypass capacitors. Base drive to the external transistor is at least 10mA, permitting output currents to exceed 1A when using high-gain transistors (β > 100). Output current limiting is implemented by limiting the external transistor’s base current. Output voltage monitoring and shutdown functions are included. The 3.