Microchip Technology MIC5302-4.6YMT-TR

Overview

MIC5302-4.6YMT-TR from Micrel is a fixed-output 4.6V ultra-low dropout (ULDO™) CMOS linear regulator delivering up to 150mA with 50mV dropout at full load, 120µV_RMS output noise, and ±2% initial accuracy. It operates from 2.3V to 5.5V input and targets space-constrained RF power stages in mobile phones and camera modules.

For engineers reviewing the MIC5302-4.6YMT-TR datasheet, MIC5302-4.6YMT-TR pinout, MIC5302-4.6YMT-TR application, or MIC5302-4.6YMT-TR equivalent, key selection criteria include dropout performance at 150mA, thermal shutdown behavior in –40°C to +125°C environments, zero-off-mode enable control, and stability with 1µF ceramic output capacitors.

Technical Context

The MIC5302-4.6YMT-TR integrates a CMOS pass element with error amplifier, thermal shutdown, and current-limit protection. Its architecture enables stable regulation with no minimum load requirement and supports active-high enable logic with <1µA shutdown current.

It uses internal reference and feedback loop optimized for low-noise operation and fast 35µs turn-on time. The regulator maintains ±3% output accuracy across –40°C to +125°C and achieves 65dB PSRR at 1kHz with 1µF output capacitance.

Key Specifications

Pinout & Package

The MIC5302-4.6YMT-TR is housed in a RoHS-compliant 4-pin 1.2mm × 1.6mm Thin MLF® package with exposed thermal pad (EPAD) internally connected to GND. Total PCB footprint is 1.92mm² - 50% smaller than SC-70 and 2mm × 2mm MLF® alternatives.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar ultra-low dropout LDO applications.

Compared with MCP1702T-4602E/MB and XC6219B462MR-G, the MIC5302-4.6YMT-TR offers the smallest footprint (1.92mm² vs. ≥8.1mm²), lowest dropout (50mV vs. ≥120mV), and integrated thermal shutdown - making it optimal for RF-sensitive, space-constrained portable designs.

Availability

MIC5302-4.6YMT-TR is available at Aetrix Electronics and suitable for mobile phone RF power stages, digital camera sensor biasing, GPS receiver front-ends, and portable media player audio codecs requiring stable component supply across industrial temperature ranges.

Supply support for MIC5302-4.6YMT-TR includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.

Manufacturer

Micrel Inc. was a U.S.-based semiconductor company specializing in analog, power management, and timing solutions before its acquisition by Microchip Technology in 2015.

The MIC5302-4.6YMT-TR belongs to Micrel's ULDO™ family of ultra-low dropout regulators designed specifically for space- and noise-constrained portable electronics including cellular RF, imaging sensors, and handheld navigation systems.

FAQ

What is the maximum input voltage rating for the MIC5302-4.6YMT-TR?

The MIC5302-4.6YMT-TR has an absolute maximum input voltage rating of +6V. However, its recommended operating input voltage range is +2.3V to +5.5V. Exceeding 5.5V may cause permanent damage or degrade long-term reliability, even if within the absolute maximum limit. Always maintain VIN ≤ 5.5V in normal operation to ensure compliance with electrical characteristics and thermal limits specified in the datasheet.

Does the MIC5302-4.6YMT-TR require an external pull-up resistor on the EN pin?

Yes - the EN pin of the MIC5302-4.6YMT-TR must not be left floating. While the device accepts CMOS logic levels, a weak external pull-up (e.g., 100kΩ to VIN or system IO rail) is strongly recommended to guarantee deterministic startup and prevent unintended shutdown due to noise or leakage. The datasheet explicitly warns against floating EN, as it may result in indeterminate output state and erratic regulation behavior.

Can the MIC5302-4.6YMT-TR operate without any load connected to VOUT?

Yes, the MIC5302-4.6YMT-TR remains stable and in regulation with zero load - a feature uncommon among many LDOs. This "no-load stability" is confirmed in the Application Information section and is essential for applications such as CMOS RAM keep-alive circuits or standby biasing of RF components that draw intermittent current. No minimum load resistor is required.

What type of output capacitor is recommended for the MIC5302-4.6YMT-TR?

The MIC5302-4.6YMT-TR is optimized for use with ≥1µF X7R or X5R dielectric ceramic capacitors. These offer stable capacitance over temperature (±15% for X7R) and low ESR, ensuring loop stability and transient response. Y5V or Z5U capacitors are discouraged due to >50% capacitance drift over temperature, which may compromise regulation margin and noise performance.

Is the exposed pad (EPAD) on the MIC5302-4.6YMT-TR electrically connected, and how should it be handled on the PCB?

Yes - the EPAD on the MIC5302-4.6YMT-TR is internally connected to GND and serves as the primary thermal conduction path. It must be soldered to a dedicated GND copper pour on the PCB using at least four thermal vias (0.3mm diameter) to an inner or bottom-layer ground plane. Failure to properly connect the EPAD significantly degrades thermal performance and may trigger premature thermal shutdown under 150mA load.