Microchip Technology MIC94310-FYCS-TR

Overview

MIC94310-FYCS-TR 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 where clean power is critical.

For engineers reviewing the MIC94310-FYCS-TR datasheet, MIC94310-FYCS-TR pinout, MIC94310-FYCS-TR application, or MIC94310-FYCS-TR equivalent, key selection criteria include its 0.88 mm × 0.88 mm WLCSP package, –40°C to +125°C junction temperature range, 20 mV typical dropout at 100 mA, 83 µV_RMS integrated output noise (10 Hz–100 kHz), and verified PSRR performance across 100 Hz–10 MHz under varying load and input conditions.

Technical Context

The MIC94310-FYCS-TR implements a high-bandwidth linear regulator architecture with active ripple rejection circuitry that maintains >68 dB PSRR at 100 kHz and >50 dB at 10 MHz while operating near dropout. Its internal charge pump bias and error amplifier enable stable regulation even when VIN is only 500 mV above VOUT.

It integrates CMOS-based enable logic with 0.4 V max logic-low threshold and 1.0 V min logic-high threshold, supports zero-load stability for RAM keep-alive, and uses thermal shutdown with hysteresis to protect against sustained overloads in compact layouts.

Key Specifications

Pinout & Package

Package: 0.88 mm × 0.88 mm 4-ball WLCSP (MIC94310-FYCS-TR). Exposed pad not present; ball pitch is 0.4 mm. Compatible with standard reflow profiles for fine-pitch CSP assembly.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar LDO with high PSRR applications.

Compared with XC6210B182MR-G and RT9080-18PU5, the MIC94310-FYCS-TR uniquely combines 0.88 mm × 0.88 mm WLCSP packaging, guaranteed >50 dB PSRR to 10 MHz, and –40°C to +125°C operation-enabling direct integration into thermally demanding, RF-sensitive subsystems without layout compromise.

Availability

MIC94310-FYCS-TR is available at Aetrix Electronics and suitable for smartphone camera modules, automotive GNSS receivers, and industrial IoT edge sensor nodes requiring stable component supply with full traceability and extended temperature compliance.

Supply support for MIC94310-FYCS-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

Microchip Technology Inc. is a leading provider of microcontrollers, analog, FPGA, and timing solutions, headquartered in Chandler, Arizona, with global design and manufacturing operations.

The MIC94310-FYCS-TR belongs to Microchip's Ripple Blocker™ LDO family, engineered specifically to replace passive LC filters in power delivery networks for RF, imaging, and precision analog subsystems.

FAQ

What is the output voltage of the MIC94310-FYCS-TR?

The MIC94310-FYCS-TR has a fixed nominal output voltage of 1.8 V, with ±1% accuracy over temperature and load. This value is confirmed in the Electrical Characteristics table (DS20006105B, page 3) and corresponds to the "G" suffix in the part numbering scheme per the Product Identification System (page 19). The MIC94310-FYCS-TR is not adjustable and does not support external feedback resistors.

Does the MIC94310-FYCS-TR require an input capacitor?

Yes, the MIC94310-FYCS-TR requires a minimum 0.47 µF ceramic input capacitor from VIN to GND for stability, as stated in Section 4.1 of the datasheet. X5R or X7R dielectrics are recommended; Y5V is explicitly discouraged due to excessive capacitance loss over temperature. The MIC94310-FYCS-TR's high bandwidth makes this capacitor essential to prevent oscillation and ensure consistent PSRR performance.

What is the maximum allowable ambient temperature for the MIC94310-FYCS-TR at 200 mA load?

At 200 mA load with VIN = 2.5 V and VOUT = 1.8 V, the MIC94310-FYCS-TR dissipates 0.14 W. With θ_JA = 250°C/W for the WLCSP package, the maximum ambient temperature is calculated as T_A = 125°C − (0.14 W × 250°C/W) = 90°C (DS20006105B, page 11). This assumes proper PCB copper area and no forced airflow. The MIC94310-FYCS-TR's junction rating remains –40°C to +125°C regardless of ambient.

Can the MIC94310-FYCS-TR be used without an output capacitor?

No - the MIC94310-FYCS-TR requires a minimum 0.47 µF ceramic output capacitor for stability, as specified in Section 4.2. However, it remains stable and in regulation with zero load current (Section 4.3), making it suitable for RAM keep-alive applications. The MIC94310-FYCS-TR's no-load stability does not eliminate the requirement for the output capacitor; C_OUT is mandatory for loop compensation and transient response.

What is the function of the NC pin in the MIC94310-FYCS-TR?

The MIC94310-FYCS-TR does not have an NC (No Connect) pin. Its 4-ball WLCSP configuration uses all four balls: A2 (VOUT), B2 (GND), B1 (EN), and A1 (VIN). The NC designation appears only in the SOT-23 variant (pin 4) and TDFN variant (pin 5); it is absent in the WLCSP package. Therefore, all four terminals on the MIC94310-FYCS-TR are functional and must be connected per the Pin Function Table (page 9).