MIC33153-4YHJ-TR Microchip Technology

The MIC33153-4YHJ-TR from Microchip Technology is a high-efficiency, 4 MHz synchronous buck regulator in a compact TDFN-14 package. This single-output regulator converts an input voltage range of 2.7V to 5.5V down to a fixed 1.2V output, capable of delivering up to 1.2A of continuous current. Its high switching frequency allows for the use of small external inductors and capacitors, making it ideal for space-constrained applications. With a wide operating temperature range of -40°C to +125°C and features like high light-load efficiency, it is perfectly suited for powering core voltages in portable battery-operated devices, IoT modules, and distributed point-of-load systems.

Features

• High Efficiency Synchronous Topology: Integrates low-Rds(on) power MOSFETs to minimize conduction losses and maximize battery life in portable applications.
• High Switching Frequency: Fixed 4 MHz operation enables the use of tiny inductors and capacitors, significantly reducing the overall solution footprint.
• Ultra-Low Quiescent Current: Typical operating supply current of only 22 µA enhances efficiency under light-load and standby conditions.
• Wide Operational Range: Supports an input voltage from 2.7V to 5.5V and operates across a -40°C to +125°C junction temperature range.
• Stable Output Performance: Features a load regulation of 0.8%/A, ensuring a stable 1.2V output under varying load conditions.

Technical Specifications

• Part Number: MIC33153-4YHJ-TR
• Type: Synchronous Buck Regulator
• Topology: Buck
• Number of Outputs: 1 Output
• Output Voltage: 1.2 V
• Output Current: 1.2 A
• Input Voltage Range: 2.7 V to 5.5 V
• Switching Frequency: 4 MHz
• Operating Temperature Range: -40 °C to +125 °C
• Mounting Style: SMD/SMT
• Package: TDFN-14

Pin Configuration and Functions

• Pin 1, 14: VIN: Power input. Connect to input supply (2.7V to 5.5V) with a nearby bypass capacitor.
• Pin 2: EN: Enable input. A logic high (>1.2V) enables the regulator; pull below 0.4V to shut down.
• Pin 3: PG: Power Good open-drain output. Goes high impedance when output is in regulation.
• Pin 4: AGND: Analog ground. Sensitive control circuit ground reference.
• Pin 5: FB: Feedback input. Connect to the output voltage divider or directly to VOUT for fixed 1.2V version.
• Pin 6: COMP: Compensation node. Connect external compensation network for loop stability.
• Pin 7: RT: Frequency set. Connect to GND for default 4MHz operation.
• Pin 8: PGND: Power ground. High-current return path for the switching MOSFETs.
• Pin 9, 10, 11, 12: SW: Switching node. Connect to the inductor.
• Pin 13: VOUT: Regulator output. Connect to the output LC filter and load.

Typical Applications

• Portable & Battery-Powered Devices: Core voltage supply for microcontrollers and sensors in handheld gadgets.
• IoT and Wearable Modules: Point-of-load regulation for wireless communication chips (Wi-Fi, BLE) and system-on-chips.
• Distributed Power Systems: Secondary voltage rail generation in set-top boxes, networking equipment, and consumer electronics.

Equivalent / Alternative Parts

• MIC33153-3YHJ-TR (Microchip Technology): Pin-to-pin compatible alternative with a fixed 3.3V output voltage, sharing all other electrical and package specifications.
• MIC33153-1YHJ-TR (Microchip Technology): Pin-to-pin compatible alternative with a fixed 1.8V output voltage, sharing all other electrical and package specifications.

Advantages

• Compact Total Solution Size: The 4MHz frequency and integrated FETs allow for a complete power supply footprint under 50mm², ideal for miniaturized designs.
• Excellent Light-Load Efficiency: The 22 µA operating current enables extended battery life in applications spending significant time in sleep or low-power modes.
• Robust Thermal Performance: The TDFN package with an exposed thermal pad and operation up to 125°C ensures reliable performance in thermally challenging environments.

Limitations

• Fixed Output Voltage: The -4 variant provides a fixed 1.2V output, requiring a different model number for other voltage rails, reducing design flexibility.
• Limited Input Voltage Range: Maximum input of 5.5V precludes direct operation from common 6V, 9V, or 12V intermediate bus voltages without a pre-regulator.
• Output Current Capability: The 1.2A maximum current is suitable for low-to-mid power loads but is insufficient for powering high-performance processors or multiple heavy loads.

Package Information

TDFN-14 package (size approximately 3.0×3.0mm), 14 pins, with an exposed thermal pad on the bottom for enhanced heat dissipation. It is designed for surface mount technology (SMT) assembly.

Manufacturer Information

Microchip Technology Inc. is a leading provider of microcontroller, mixed-signal, analog, and Flash-IP solutions. Known for its robust and reliable semiconductor components, Microchip's product portfolio serves a wide array of applications across the industrial, automotive, consumer, aerospace, and communications markets.

Design-in Tips

• Thermal Management: Ensure the PCB thermal pad under the IC is properly soldered and connected to a ground plane with multiple vias to act as a heat sink.
• Input/Output Capacitor Selection: Use low-ESR ceramic capacitors placed as close as possible to the VIN and VOUT pins to minimize switching noise and ensure stability.
• Inductor Selection: Choose a shielded inductor with a saturation current rating above the peak switch current and a DCR suitable for the target efficiency. A 1.0 µH to 1.5 µH inductor is typical for 4MHz operation.

Lifecycle Status & PCN/PDN Notes

Lifecycle status information is not provided in the input parameters. For the most current lifecycle status and any applicable Product Change Notifications (PCN) or Product Discontinuation Notices (PDN), please consult the official Microchip Technology website or contact their support directly.