Microchip Technology MIC94310-FYMT-T5

Overview

MIC94310-FYMT-T5 from Microchip Technology is a 200 mA fixed-output LDO voltage regulator with Ripple Blocker™ technology, designed to suppress switching noise from DC/DC converters in RF-sensitive applications. It operates from 1.8V to 3.6V input, delivers ±1% output voltage accuracy, achieves >50 dB PSRR from 10 Hz to 10 MHz at 200 mA load, and features logic-controlled enable, thermal shutdown, and current limiting. It is used in smartphone camera modules and GPS receivers requiring ultra-low noise power rails.

For engineers reviewing the MIC94310-FYMT-T5 datasheet, MIC94310-FYMT-T5 pinout, MIC94310-FYMT-T5 application, or MIC94310-FYMT-T5 equivalent, key selection criteria include its 1.2 mm × 1.6 mm TDFN-4 package, 20 mV typical dropout at 100 mA, 83 µV_RMS integrated output noise (10 Hz–100 kHz), EN pin logic thresholds (V_{EN_LOW} ≤ 0.4 V, V_{EN_HIGH} ≥ 1.0 V), and -40°C to +125°C junction temperature range.

Technical Context

The MIC94310-FYMT-T5 integrates a high-bandwidth error amplifier and charge-pump bias circuit to maintain stable PSRR performance even as VIN approaches VOUT-enabling efficient operation near dropout. Its Ripple Blocker™ architecture uses active feedback to reject low-frequency ripple while preserving fast transient response.

It implements CMOS-based enable control with sub-1 µA shutdown current, thermal shutdown triggered at +125°C junction temperature, and foldback current limiting that activates at 250–700 mA depending on output short condition. The device remains stable with no load and supports ceramic output capacitors from 0.47 µF (TDFN) to 10 µF (SOT-23).

Key Specifications

Pinout & Package

Package: 4-pin 1.2 mm × 1.6 mm Thin DFN (TDFN) with exposed pad (EPAD) for thermal enhancement. Pin 1 = VOUT, Pin 2 = GND, Pin 3 = EN, Pin 4 = VIN. EPAD must be soldered to PCB ground plane for optimal thermal performance (θ_JA = 173°C/W).

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar LDO with ripple suppression applications.

Compared with XC6216D182MR-G and RP114K181D-TR-F, the MIC94310-FYMT-T5 uniquely combines EN control, 1.2 mm × 1.6 mm TDFN with EPAD, and >50 dB PSRR up to 10 MHz-making it optimal for RF-critical, thermally constrained, and power-gated applications.

Availability

MIC94310-FYMT-T5 is available at Aetrix Electronics and suitable for smartphone camera modules, automotive GPS receivers, tablet PC audio codecs, and industrial IoT sensor nodes requiring stable component supply with guaranteed long-term availability.

Supply support for MIC94310-FYMT-T5 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

Microchip Technology Inc. is a leading provider of microcontroller, analog, FPGA, and mixed-signal semiconductors headquartered in Chandler, Arizona.

The MIC94310 belongs to Microchip's Ripple Blocker™ LDO family, engineered specifically to replace passive RC/LC filtering in RF and precision analog power domains-delivering superior noise rejection in miniature packages without external components.

FAQ

What output voltage does the MIC94310-FYMT-T5 provide?

The MIC94310-FYMT-T5 provides a fixed 1.8 V output voltage. The "F" in the part number denotes the 1.8 V variant per Microchip's product identification system. Output voltage accuracy is ±1% over temperature and load, with typical line regulation of 0.01% across the 1.8 V–3.6 V input range. This makes MIC94310-FYMT-T5 suitable for powering 1.8 V I/O interfaces and core logic in portable electronics.

Does the MIC94310-FYMT-T5 require an input capacitor?

Yes, the MIC94310-FYMT-T5 requires a minimum 0.47 µF low-ESR ceramic input capacitor connected between VIN and GND, placed within 2 mm of the pins. This capacitor ensures stability and high-frequency noise filtering. X5R or X7R dielectrics are recommended; Y5V types are discouraged due to capacitance loss over temperature. Without this capacitor, the MIC94310-FYMT-T5 may exhibit oscillation or degraded PSRR performance.

How does the enable (EN) pin function on the MIC94310-FYMT-T5?

The EN pin on the MIC94310-FYMT-T5 is a CMOS-compatible active-high control input. A logic HIGH ≥1.0 V enables the output; a logic LOW ≤0.4 V disables it, reducing quiescent current to 0.2 µA typical. The pin must never be left floating-external pull-down or microcontroller GPIO control is required. This feature allows precise power sequencing in multi-rail systems using MIC94310-FYMT-T5.

What is the thermal performance of the MIC94310-FYMT-T5 in its TDFN package?

The MIC94310-FYMT-T5 in its 1.2 mm × 1.6 mm TDFN package has a junction-to-ambient thermal resistance (θ_JA) of 173°C/W when the EPAD is properly soldered to a 1-in² copper pour. At 200 mA load with 0.7 V dropout (VIN = 2.5 V, VOUT = 1.8 V), power dissipation is 140 mW, resulting in a maximum ambient temperature of 101°C before reaching the +125°C junction limit. Thermal derating is required above this point.

Can the MIC94310-FYMT-T5 be used with ceramic output capacitors?

Yes, the MIC94310-FYMT-T5 is optimized for low-ESR ceramic output capacitors. For the TDFN package, a minimum 0.47 µF is required; 1 µF is recommended for best ripple rejection. X7R or X5R dielectrics are preferred for stable capacitance over temperature. High-ESR capacitors (e.g., tantalum or aluminum electrolytic) are not recommended-they risk high-frequency oscillation and reduced PSRR performance in the MIC94310-FYMT-T5 design.