Microchip Technology MCP16321T-250E/NG

Overview

MCP16321T-250E/NG from Microchip Technology is a synchronous step-down DC-DC converter IC delivering 1A continuous output at fixed 2.5V with ±2% accuracy, operating from 6.0V to 24V input, featuring integrated 180 mΩ high-side and 120 mΩ low-side N-MOSFETs, 1 MHz fixed-frequency peak current mode control, and power-good indication. It serves as a compact, high-efficiency bias supply for industrial 12V-input systems and microcontroller core rails.

For engineers reviewing the MCP16321T-250E/NG datasheet, MCP16321T-250E/NG pinout, MCP16321T-250E/NG application, or MCP16321T-250E/NG equivalent, key selection criteria include input voltage range (6–24V), fixed 2.5V output tolerance, thermal shutdown threshold (170°C), PG open-drain reporting, and QFN-16 (3×3 mm) package compatibility with ceramic output capacitors.

Technical Context

The MCP16321T-250E/NG implements peak current mode control with internal slope compensation to ensure stability across load and line transients, supporting continuous conduction mode down to ~7% duty cycle. Its fixed 1 MHz switching frequency enables small external inductors (e.g., 4.7 µH) and ceramic output capacitors (2×22 µF), while internal soft-start limits inrush current during enable-triggered startup.

It integrates dual N-channel MOSFETs with verified on-resistances (180 mΩ HS / 120 mΩ LS), a 0.9V internal reference for feedback regulation, undervoltage lockout (5.75V start, 0.65V hysteresis), overvoltage protection (103% VOUT), and overtemperature shutdown (170°C with 10°C hysteresis), all within a thermally enhanced QFN-16 package with exposed pad.

Key Specifications

Pinout & Package

Package: 16-pin QFN (3 mm × 3 mm, 0.5 mm pitch) with exposed thermal pad (EP) requiring PCB GND connection for thermal performance and EMI reduction.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MCP16311T-250E/NG and MIC24046-2.5YMT, the MCP16321T-250E/NG provides precise 1A capability with full 24V support and integrated power-good signaling - making it the optimal choice for industrial 12V/24V systems requiring deterministic power sequencing and thermal robustness.

Availability

MCP16321T-250E/NG is available at Aetrix Electronics and suitable for industrial control, medical instrumentation, and embedded microcontroller power supply applications requiring stable component supply, long-term lifecycle assurance, and RoHS-compliant packaging.

Supply support for MCP16321T-250E/NG 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 devices, and power management ICs, headquartered in Chandler, Arizona, with global design and manufacturing operations.

The MCP16321/2 product line was designed specifically for high-efficiency, wide-input synchronous buck conversion in space-constrained industrial and automotive applications - emphasizing integration, thermal resilience, and ease of implementation.

FAQ

What is the maximum input voltage supported by the MCP16321T-250E/NG?

The MCP16321T-250E/NG supports an absolute maximum input voltage of 26.4V, with operational specification from 6.0V to 24V. Operation above 24V risks exceeding absolute ratings and may cause permanent damage. The device incorporates undervoltage lockout that prevents startup below 5.75V (typical), ensuring reliable behavior across its specified input range. Always refer to the DS20002285B datasheet for derating guidelines at elevated temperatures.

Does the MCP16321T-250E/NG require external compensation components?

No, the MCP16321T-250E/NG features fully internal compensation - including error amplifier and slope compensation - eliminating the need for external RC networks. This simplifies design, reduces bill-of-materials cost, and improves consistency across production units. Stability is guaranteed with standard ceramic output capacitors (e.g., 2×22 µF) and a 4.7 µH inductor, as validated in Microchip's reference schematics.

How does the Power Good (PG) pin function on the MCP16321T-250E/NG?

The PG pin on the MCP16321T-250E/NG is an open-drain output that remains low until VOUT exceeds 93% of 2.5V (2.325V), then asserts high after a fixed 10 ms delay. It can be pulled up to any voltage ≤6V and interfaces directly with microcontroller reset inputs or FPGA configuration sequencers. The PG signal confirms both regulation and absence of overvoltage faults, providing deterministic system power-up sequencing.

Can the MCP16321T-250E/NG operate with ceramic output capacitors?

Yes, the MCP16321T-250E/NG is explicitly characterized and stabilized for use with low-ESR ceramic output capacitors - such as 2×22 µF X5R/X7R MLCCs - eliminating the need for bulk aluminum or tantalum capacitors. This reduces board area, improves reliability, and avoids capacitance drift over temperature and time. Ceramic compatibility is enabled by internal compensation and optimized control loop design.

What thermal management considerations apply to the MCP16321T-250E/NG?

The MCP16321T-250E/NG uses a 3×3 mm QFN package with an exposed thermal pad (EP) that must be soldered to a dedicated PCB GND plane for effective heat dissipation. Thermal resistance θ_JA is 38.5°C/W with a 4-layer board and internal 1 oz copper ground plane. At 1A output and 12V input, junction temperature rise is ~35°C above ambient - staying well below the 170°C shutdown threshold when proper layout rules are followed.