Microchip Technology MIC33050-4YHL-TR

Overview

MIC33050-4YHL-TR from Microchip Technology is a 4 MHz synchronous buck DC-DC power module with integrated inductor, delivering up to 600 mA output current at fixed 1.2 V output voltage, operating from 2.7 V to 5.5 V input, and featuring HyperLight Load® architecture for ultra-low 20 µA quiescent current and >85% efficiency at 1 mA - ideal for space-constrained MPU and wearable power rails.

For engineers reviewing the MIC33050-4YHL-TR datasheet, MIC33050-4YHL-TR pinout, MIC33050-4YHL-TR application, or MIC33050-4YHL-TR equivalent, key selection criteria include its internal-inductor 12-pin HDFN package, –40°C to +125°C junction temperature rating, 4 MHz PWM operation, feedback voltage of 400 mV, and compatibility with 2.2 µF ceramic output capacitors in portable instrumentation and RF module designs.

Technical Context

The MIC33050-4YHL-TR implements a proprietary HyperLight Load® control scheme that combines minimum on/off time PFM at light loads (enabling 20 µA IQ and >85% efficiency at 1 mA) with seamless transition to constant-frequency 4 MHz PWM mode above ~100 mA load, maintaining >93% peak efficiency. Its internal PMOS/NMOS synchronous switch pair features R_DS(ON) of 0.45 Ω / 0.5 Ω and supports discontinuous conduction mode (DCM) for fast transient response without external compensation.

This device integrates a 400 mV internal reference and uses SNS (for fixed-output variants) or FB (for adjustable variants) to regulate output; the MIC33050-4YHL-TR is the fixed 1.2 V version, where SNS connects internally to set V_OUT, eliminating need for external resistor divider. Soft-start time is 650 µs, and undervoltage lockout triggers at 2.55 V typical with 100 mV hysteresis.

Key Specifications

Pinout & Package

Package: 12-pin 3 mm × 3 mm × 0.9 mm HDFN with exposed thermal pad (ePAD), RoHS-compliant and Pb-free.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar synchronous buck regulator applications.

Compared with MIC33050-GYHL-TR, the MIC33050-4YHL-TR provides tighter voltage matching for 1.2 V core domains; versus TPS62865RQYR, it trades off 400 mA extra current capacity for guaranteed 20 µA IQ, integrated inductor, and superior sub-10 mA efficiency - making it optimal for ultra-compact, battery-sensitive designs.

Availability

MIC33050-4YHL-TR is available at Aetrix Electronics and suitable for MPU power, wearable devices, RF modules, space-constrained MCU systems, and USB-powered instrumentation requiring stable component supply across automotive, industrial, and medical-grade programs.

Supply support for MIC33050-4YHL-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 is a leading provider of microcontrollers, analog, FPGA, and power management semiconductors, serving industrial, automotive, communications, and consumer markets with vertically integrated silicon and software solutions.

The MIC33050 product line delivers highly integrated, thermally robust DC-DC power modules targeting ultra-low-power, space-constrained applications such as wearables, portable instrumentation, and RF subsystems - emphasizing ease of use, minimal external components, and wide temperature operation.

FAQ

What is the output voltage of the MIC33050-4YHL-TR?

The MIC33050-4YHL-TR delivers a fixed 1.2 V output voltage with ±2.5% accuracy over line, load, and temperature. This value is factory-trimmed and does not require external resistors - the SNS pin connects internally to set the regulation point, distinguishing it from adjustable variants like MIC33030-AYHL-TR.

Does the MIC33050-4YHL-TR require an external inductor?

No, the MIC33050-4YHL-TR integrates a power inductor within its 12-pin HDFN package. This eliminates the need for external magnetics, reduces PCB footprint, and removes inductor selection and layout sensitivity - a key differentiator from conventional buck regulators like the TPS62865RQYR.

What is the quiescent current specification for the MIC33050-4YHL-TR?

The MIC33050-4YHL-TR has a typical quiescent current of 20 µA under no-load conditions with VIN = 3.6 V and VOUT = 1.2 V. This ultra-low IQ is enabled by HyperLight Load® architecture and supports >7-day battery life in always-on wearable applications using a 200 mAh cell.

Can the MIC33050-4YHL-TR operate across the full industrial temperature range?

Yes, the MIC33050-4YHL-TR is rated for a junction temperature range of –40°C to +125°C and is qualified for continuous operation across this range. Its thermal resistance (θ_JA) is 60°C/W, and the exposed ePAD must be soldered to a PCB ground plane to achieve reliable performance in sealed enclosures or near heat sources.

What capacitor values are recommended for input and output filtering of the MIC33050-4YHL-TR?

Microchip specifies a minimum 2.2 µF X5R or X7R ceramic capacitor at the VIN pin (close to PGND) and ≥2.2 µF X5R/X7R ceramic at the OUT pin. Y5V and Z5U dielectrics are discouraged due to capacitance loss over temperature and high-frequency resistive behavior that degrades ripple suppression and loop stability.