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MCP1755T-3302E/OT

MCHPMCP1755T-3302E/OT

Microchip Technology
Linear Voltage Regulator IC Positive Fixed 1 Output 300mA SOT-23-5
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Overview

The MCP1755T-3302E/OT is a high-performance, 300mA low-dropout (LDO) linear regulator designed for high-voltage input applications requiring a stable 3.3V output. It features a high Power Supply Rejection Ratio (PSRR) of 80dB at 1kHz, making it suitable for noise-sensitive analog circuits and communication interfaces. The device includes integrated safety features such as true current foldback and thermal shutdown to protect the system during fault conditions.

Why Choose This Part

The MCP1755 stands out with its high PSRR and low 100 uA typical quiescent current, balancing noise performance with power efficiency. Its true current foldback protection prevents overheating by reducing output current during short-circuit events, while the Power Good output simplifies power sequencing in multi-rail systems.

Applications

Battery-Powered Handheld Devices
Ideal for portable equipment where the 0.1 uA typical shutdown current helps extend battery shelf life.
Microcontroller Power
Provides a clean 3.3V rail for MCUs and digital logic from inputs as high as 16V.
Noise-Sensitive Analog Rails
Uses its 80dB PSRR to filter out ripple from upstream switching power supplies in sensor front-ends.
Industrial Sensors
The 16V maximum input voltage allows for operation in industrial environments with unregulated DC buses.

Key Specifications

PSRR 80dB (1kHz)
Output Type Fixed
Mounting Type Surface Mount
Package / Case SC-74A, SOT-753
Control Features Enable, Power Good
Current - Output 300mA
Protection Features Over Current, Over Temperature, Short Circuit, Under Voltage Lockout (UVLO)
Number of Regulators 1
Output Configuration Positive
Operating Temperature -40degC ~ 125degC
Voltage - Input (Max) 16V
Voltage Dropout (Max) 0.5V @ 300mA
Current - Supply (Max) 400 uA
Supplier Device Package SOT-23-5
Current - Quiescent (Iq) 100 uA
Voltage - Output (Min/Fixed) 3.3V

Getting Started

To implement this LDO, place a minimum 1.0uF ceramic capacitor on both the input and output pins for stability. Use the SHDN pin to toggle the regulator state; pulling it low reduces current consumption to approximately 0.1 uA. The Power Good (PWRGD) open-drain output can be tied to an MCU interrupt or reset pin to monitor voltage regulation status.

Also Consider

MCP1703T-3302E/CB MCHPMicrochip Technology - Provides a much lower quiescent current (2.0 uA) for extremely low-power standby applications, though with lower PSRR.
LP2985-33DBVR TITexas Instruments - A classic 150mA LDO alternative in the SOT-23-5 package known for low noise performance.