CAT6243-ADJMT5T3

Product Overview

The CAT6243-ADJMT5T3 from Fairchild Semiconductor is a surface-mount linear low-dropout voltage regulator intended for positive, adjustable output applications. It provides one regulated output from an input maximum of 5 V, with an output adjustment range listed from 0.8 V to 5 V and output current capability of 1 A. The device includes an enable control and protection functions covering overcurrent, overtemperature, and undervoltage lockout. Its specified dropout voltage is 0.275 V at 1 A, and it is supplied in a 6-WDFN exposed-pad package.

Key Features

• Positive adjustable linear regulator with one output and 1 A output current capability.
• Input voltage maximum of 5 V with output adjustment range of 0.8 V to 5 V.
• Maximum dropout voltage of 0.275 V at 1 A for low-headroom regulation.
• Quiescent current of 100 µA and maximum supply current of 250 µA.
• PSRR of 54 dB to 42 dB across 1 kHz to 20 kHz.
• Enable control with overcurrent, overtemperature, and undervoltage lockout protection.
• Surface-mount 6-WDFN exposed-pad package, supplier device package 6-WDFN (3x3).
• Operating temperature range -40°C to 85°C.

Applications

• Adjustable local positive supply for embedded board circuitry operating from an input within the specified 5 V maximum.
• Post-regulation stage for producing a lower adjustable rail from a 5 V input, subject to dropout and output current conditions.
• Enable-controlled voltage rail for test fixtures or equipment requiring a single adjustable positive output.
• Analog or mixed-signal circuits requiring an adjustable low-dropout supply with specified PSRR and integrated protection.

Design & Procurement Notes

When selecting this part, confirm that the maximum input voltage, output adjustment range, and 1 A output current fit the target rail. The 0.275 V dropout at 1 A should be considered when the input-to-output differential is small, and the 100 µA quiescent current and 250 µA maximum supply current may be relevant in low-current systems. PSRR is specified as a range over 1 kHz to 20 kHz, so application frequency conditions should be reviewed. The 6-WDFN exposed-pad surface-mount package requires appropriate PCB mounting and layout. The supplied ProductStatus is Obsolete, so lifecycle and procurement status should be evaluated.