Microchip Technology MCP16322T-150E/NG

Overview

MCP16322T-150E/NG from Microchip Technology is a synchronous step-down DC-DC converter IC delivering up to 2A continuous output current at fixed 1.5V with ±2% accuracy, operating from 6.0V–24V input, featuring integrated 180 mΩ high-side and 120 mΩ low-side N-channel MOSFETs, 1 MHz fixed-frequency peak current mode control, and power-good (PG) indication in a 3×3 mm QFN-16 package. It serves as a compact, high-efficiency bias supply for industrial 12V-input systems and embedded microcontroller domains.

For engineers reviewing the MCP16322T-150E/NG datasheet, MCP16322T-150E/NG pinout, MCP16322T-150E/NG application, or MCP16322T-150E/NG equivalent, key selection criteria include verified 2A output capability at 1.5V, confirmed thermal shutdown at 170°C, validated UVLO start threshold of 5.75V, and documented compatibility with ceramic output capacitors without external compensation.

Technical Context

The MCP16322T-150E/NG implements a fixed-frequency (0.9–1.1 MHz) peak current mode control architecture with internal slope compensation to prevent subharmonic oscillation above 50% duty cycle. Its dual integrated N-channel switches-180 mΩ high-side and 120 mΩ low-side-enable synchronous rectification, eliminating external diode losses and supporting >95% typical efficiency across load and input ranges.

Control functions include internal soft-start (4 ms), cycle-by-cycle current limiting (2.4–3.4 A for MCP16322), VOUT overvoltage protection (103% VOUT), undervoltage lockout (5.75 V start, 0.65 V hysteresis), and thermal shutdown (170°C trip, 160°C recovery). The PG open-drain output provides regulated output status after a 10 ms delay following VOUT reaching 93% of target.

Key Specifications

Pinout & Package

Package: 3×3 mm QFN-16 with exposed thermal pad (EP), RoHS-compliant, moisture-sensitive level 3. Thermal resistance θ_JA = 38.5°C/W on 4-layer FR4 board with internal ground plane.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MCP16312T-150E/NG and MIC24046-1.5YMT, the MCP16322T-150E/NG delivers optimal trade-offs for industrial 12 V input systems: identical 1.5 V accuracy and PG functionality as the MCP16312, but in a smaller 3×3 mm footprint and lower cost; unlike the MIC24046, it retains essential system-level features (PG, UVLO hysteresis, thermal shutdown) without requiring redesign of enable sequencing or supervision logic.

Availability

MCP16322T-150E/NG is available at Aetrix Electronics and suitable for industrial control, embedded microcontroller biasing, and DSL modem power supplies requiring stable component supply and long-term lifecycle support.

Supply support for MCP16322T-150E/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 microcontroller, analog, FPGA, and power management semiconductors, headquartered in Chandler, Arizona, with global design and manufacturing operations.

The MCP1632x family was designed specifically for high-efficiency, high-input-voltage synchronous buck conversion in space-constrained industrial and communications equipment, emphasizing integration, thermal robustness, and ease of use without external compensation.

FAQ

What is the maximum continuous output current of the MCP16322T-150E/NG?

The MCP16322T-150E/NG delivers up to 2 A continuous output current at its fixed 1.5 V output, verified across the full input range (6.0 V–24 V) and operating junction temperature (–40°C to +125°C). This rating assumes proper PCB thermal design with the exposed pad soldered to a minimum 13.5 in² internal ground plane, as specified in the thermal characteristics table (θ_JA = 38.5°C/W).

Does the MCP16322T-150E/NG require external compensation components?

No, the MCP16322T-150E/NG features fully internal compensation, including an integrated error amplifier and slope compensation circuitry. This eliminates the need for external RC networks typically required in voltage-mode or uncompensated current-mode controllers, reducing BOM count and layout complexity while ensuring stability with standard ceramic output capacitors.

What is the function of the PG (Power Good) pin on the MCP16322T-150E/NG?

The PG pin on the MCP16322T-150E/NG is an open-drain, active-low output that signals when the 1.5 V output has reached regulation. It remains low until VOUT exceeds 93% of 1.5 V (1.395 V), then waits 10 ms before allowing an external pull-up to assert high. This provides reliable power sequencing for downstream logic and avoids false resets during startup transients.

Can the MCP16322T-150E/NG operate from a 24 V input while delivering 1.5 V output?

Yes, the MCP16322T-150E/NG supports input voltages up to 24 V and maintains regulation at 1.5 V output. At VIN = 24 V, the minimum achievable duty cycle (7%) allows continuous conduction mode up to ~21.4 V input; above that, pulse-skipping occurs to maintain regulation. Efficiency remains >85% at 2 A load per Figure 2-6, confirming robust high-step-down operation.

Is the MCP16322T-150E/NG pin-compatible with other members of the MCP16321/2 family?

Yes, all MCP16321/2 variants-including MCP16322T-150E/NG-share identical QFN-16 (3×3 mm) pinout and package dimensions. Fixed-output versions (e.g., 1.5 V, 3.3 V) and adjustable versions differ only in internal reference configuration and VFB connection; external circuitry (inductor, capacitors, BOOST cap) remains unchanged across the family.