Microchip Technology MCP16322T-180E/NG

Overview

MCP16322T-180E/NG from Microchip Technology is a synchronous step-down DC-DC converter IC delivering up to 2A continuous output current at fixed 1.8V with ±2% accuracy, operating from 6.0V–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 embedded microcontroller domains.

For engineers reviewing the MCP16322T-180E/NG datasheet, MCP16322T-180E/NG pinout, MCP16322T-180E/NG application, or MCP16322T-180E/NG equivalent, key selection criteria include verified 2A output capability at 1.8V, QFN-16 (3×3 mm) thermal pad layout compatibility, UVLO threshold of 5.75V, and confirmed VOUT overvoltage protection at 103%.

Technical Context

The MCP16322T-180E/NG implements a fixed-frequency (1 MHz) peak current mode architecture with internal slope compensation to prevent subharmonic oscillation above 50% duty cycle. Its dual integrated N-channel MOSFETs-180 mΩ high-side and 120 mΩ low-side-enable synchronous rectification without external diodes, minimizing conduction loss across the full 6–24V input range.

Control logic includes internal soft-start (4 ms), undervoltage lockout (5.75V start, 0.65V hysteresis), overtemperature shutdown (170°C trip, 160°C recovery), and open-drain PG output with 10 ms release timer and 93% VOUT undervoltage detection. The device supports ceramic output capacitors and requires only a single external boost capacitor (22 nF) between BOOST and SW pins.

Key Specifications

Pinout & Package

Package: 16-pin QFN (3 mm × 3 mm, 0.5 mm pitch) with exposed thermal pad (EP) requiring PCB ground 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 MCP16312T-180E/NG, the MCP16322T-180E/NG offers lower conduction loss at 2A due to its 180 mΩ high-side switch, while MIC24046-1.8YML trades switching speed for EMI headroom and requires layout revision-neither is pin-compatible, but both serve overlapping 1.8V/2A industrial use cases.

Availability

MCP16322T-180E/NG is available at Aetrix Electronics and suitable for industrial control panels, medical monitoring devices, and set-top box power supplies requiring stable component supply and long-term manufacturability assurance.

Supply support for MCP16322T-180E/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 is a U.S.-based semiconductor company specializing in microcontrollers, analog, and power management ICs, with broad industrial and automotive qualification coverage.

The MCP1632x family targets high-input-voltage synchronous buck conversion for space-constrained embedded systems, emphasizing integration, thermal robustness, and ease of design-in with minimal external components.

FAQ

What is the maximum continuous output current of the MCP16322T-180E/NG?

The MCP16322T-180E/NG delivers up to 2A continuous output current at 1.8V when operated within its specified input voltage range (6.0V–24V), junction temperature limit (–40°C to +125°C), and with adequate PCB copper area for the exposed thermal pad. This rating is confirmed in the DC CHARACTERISTICS table on page 3 of DS20002285B and applies across the full input range.

Does the MCP16322T-180E/NG require an external bootstrap diode?

No, the MCP16322T-180E/NG does not require an external bootstrap diode. Its internal high-side gate driver uses a charge-pump architecture that recharges the BOOST capacitor (22 nF between BOOST and SW) during low-side conduction, as described in Section 4.1.7 and Figure 4-1. An external diode would interfere with this self-recharging mechanism.

How does the Power Good (PG) pin behave during startup of the MCP16322T-180E/NG?

During startup, the PG pin remains low until the output voltage reaches 93% of 1.8V (1.674V). Once that threshold is crossed, a 10 ms internal timer begins; only after this delay does the open-drain PG output become high-impedance, allowing an external pull-up to assert logic-high. This behavior is defined in Table 4-1 and Section 3.5 of DS20002285B.

Can the MCP16322T-180E/NG operate with input voltages below 6.0V?

No, the MCP16322T-180E/NG cannot operate reliably below 6.0V input. Its absolute minimum input voltage is 6.0V per the Absolute Maximum Ratings table (page 3), and its undervoltage lockout activates below 5.75V (typical), disabling regulation. Operation below 6.0V risks failure to start or unstable output, as confirmed in Section 4.1.7 and Figure 2-25.

What is the purpose of the two separate ground pins (SGND and PGND) on the MCP16322T-180E/NG?

SGND (Signal Ground) serves as the reference for analog circuits-feedback amplifier, error comparator, and internal bias-while PGND (Power Ground) carries high di/dt return current from the low-side MOSFET. Separating them prevents switching noise from corrupting regulation accuracy. The datasheet mandates independent routing to a common ground plane only at the thermal pad (EP), as shown in Figure 2-1 and Section 3.8.