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Microchip Technology MCP16321T-330E/NG
- Part No.:
- MCP16321T-330E/NG
- Manufacturer:
- Microchip Technology
- Package:
- 16-VFQFN Exposed Pad
- Datasheet:
-
MCP16321T-330E/NG.pdf
- Description:
- IC REG BUCK 3.3V 1A 16QFN
- Quantity:
- Payment:
- Shipping:
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Product details
Overview
MCP16321T-330E/NG from Microchip Technology is a synchronous step-down DC-DC converter IC delivering 1A continuous output at fixed 3.3V (±2%) 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 indication via open-drain PG pin. It targets industrial 12V-input power rails, PIC®/dsPIC® microcontroller bias supplies, and wall-cube regulated outputs.
For engineers reviewing the MCP16321T-330E/NG datasheet, MCP16321T-330E/NG pinout, MCP16321T-330E/NG application, or MCP16321T-330E/NG equivalent, this page delivers verified electrical parameters, QFN-16 thermal pad layout guidance, real-world efficiency curves at 3.3V/1A, and validated alternative parts for legacy design continuity.
Technical Context
The MCP16321T-330E/NG implements a fixed-frequency (0.9–1.1 MHz) peak current mode architecture with internal slope compensation to prevent subharmonic oscillation above 50% duty cycle. Its dual integrated MOSFETs-180 mΩ high-side and 120 mΩ low-side-enable >95% typical efficiency at 12VIN/3.3VOUT/1A while supporting ceramic output capacitors and internal soft-start.
Control logic includes undervoltage lockout (5.5–6.0 V start, 0.65 V hysteresis), overtemperature shutdown (170°C trip, 160°C recovery), VOUT overvoltage protection (103% threshold), and PG pin reporting with 10 ms release timer after VOUT exceeds 93% of nominal. The BOOST capacitor (22 nF) is replenished every 8th cycle via SW node during high-duty operation.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 3.3V ±2% - tight regulation enables direct powering of 3.3V logic without external feedback resistors. |
| Max Output Current | 1A continuous - sufficient for single-core microcontrollers, FPGAs, and sensor interfaces in industrial 12V systems. |
| Input Voltage Range | 6.0V to 24V - supports wide-range industrial, automotive, and AC-DC adapter inputs without pre-regulation. |
| Switching Frequency | 1 MHz ±10% - enables compact 4.7 µH inductors and low-ESR ceramic capacitors for minimal board area. |
| High-Side RDS(ON) | 180 mΩ - reduces conduction loss at high load, critical for maintaining >92% efficiency at 1A/12VIN. |
| Low-Side RDS(ON) | 120 mΩ - minimizes freewheeling loss, improving light-load efficiency and thermal performance in QFN-16 package. |
| UVLO Threshold | 5.75V typical start with 0.65V hysteresis - prevents erratic startup during brownout conditions on 12V bus. |
| Shutdown Current | 5–10 µA - enables ultra-low-power system sleep modes without external load switches. |
Pinout & Package
Package: 3×3 mm QFN-16 with exposed thermal pad (EP), RoHS-compliant, moisture-sensitive level 3. Thermal resistance θJA = 38.5°C/W on 4-layer FR4 with internal ground plane.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 12, 13, 16 SW | Switch node | Common drain-source connection point for both MOSFETs; must connect directly to inductor and BOOST capacitor with short, wide trace to minimize ringing. |
| 2, 3, 11 VIN | Input supply | Dual-purpose: powers internal bias circuitry and high-side gate driver; requires 2×10 µF local decoupling near pins. |
| 4 SGND | Signal ground | Analog reference and control loop ground; must be isolated from PGND except at single-point PCB star ground. |
| 5 VFB | Feedback input | Internally tied to 3.3V reference for fixed-output version; no external resistor divider required. |
| 6, 7 NC | No connection | Unbonded die pads; must remain unconnected and unstubbed on PCB layout. |
| 8 PG | Power good | Open-drain active-low output; pulled up externally to ≤6V; asserts after 10 ms once VOUT ≥ 93% of 3.3V. |
| 9 EN | Enable input | Logic-high (>2.2V) enables regulator; internally pulled up to 4.2V; max 6V rating allows direct MCU GPIO control. |
| 10 BOOST | Bootstrap voltage | Drives high-side gate; requires 22 nF ceramic cap between BOOST and SW; auto-recharged every 8th switching cycle. |
| 14, 15 PGND | Power ground | Low-side MOSFET source return; carries high di/dt switching current; must route separately from SGND to avoid noise coupling. |
| 17 EP | Exposed thermal pad | Electrically isolated copper pad; must be soldered to solid GND plane for thermal dissipation and EMI reduction. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated dual N-MOSFETs | Eliminates external switch selection and drive complexity; 180 mΩ/120 mΩ RDS(ON) enables full 1A output in 3×3 mm QFN. |
| Internal compensation | Reduces BOM count by removing external compensation network; stable with ceramic output capacitors across full load range. |
| Peak current mode control | Provides fast transient response to load steps (<100 µs recovery) and inherent cycle-by-cycle current limiting for short-circuit protection. |
| VOUT supervisor with PG pin | Enables system-level power sequencing and fault detection without external monitoring ICs; 10 ms delay ensures stable regulation before assertion. |
| Thermal and overvoltage protection | Dual safety layers: 170°C die shutdown with 10°C hysteresis and 103% VOUT overvoltage clamp prevent catastrophic failure under fault conditions. |
| Soft-start | 4 ms internal ramp limits inrush current during startup, preventing input rail collapse and output overshoot in multi-rail systems. |
Applications
| PIC®/dsPIC® Microcontroller Bias Supply | 12V Industrial Input DC-DC Conversion |
|---|---|
Use Scenario: Powering 3.3V core and I/O rails of PIC32MX or dsPIC33EP microcontrollers in factory automation controllers. IC Role / Device Role / Timing Role: Primary buck regulator providing tightly regulated 3.3V at up to 1A with fast transient response to CPU burst loads. Use Value: Eliminates need for external feedback resistors and compensation components; 95% efficiency at 12VIN/3.3VOUT reduces thermal load in sealed enclosures. |
Use Scenario: Converting unregulated 12V from DIN-rail power supplies to clean 3.3V for PLC I/O modules and fieldbus interfaces. IC Role / Device Role / Timing Role: High-input-voltage synchronous buck converter with UVLO hysteresis ensuring reliable startup under varying bus conditions. Use Value: 6–24V input range accommodates brownout and surge conditions common in industrial 12V systems; PG pin enables watchdog-triggered reset on rail failure. |
| Wall Cube Regulation | SLA Battery Powered Devices |
Use Scenario: Regulating 12–18V DC output from universal AC/DC wall adapters to stable 3.3V for IoT gateways and smart home hubs. IC Role / Device Role / Timing Role: Fixed-output buck regulator with low 5 µA shutdown current enabling energy-efficient standby modes. Use Value: 1 MHz switching allows use of small 4.7 µH inductors and 22 µF ceramic capacitors, reducing adapter size and cost vs. lower-frequency alternatives. |
Use Scenario: Powering 3.3V sensors and wireless transceivers from 12V sealed lead-acid (SLA) batteries in security panels and remote telemetry units. IC Role / Device Role / Timing Role: Wide-input buck converter operating down to 6V to extend runtime as battery discharges from 12.8V to 10.5V. Use Value: Undervoltage lockout (5.75V start) prevents deep discharge damage; 92% efficiency at 9VIN/3.3VOUT/500mA extends battery life by >15% vs. linear regulators. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar synchronous buck regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MCP16311T-330E/NG | Same 3.3V fixed output, but rated for 2A output current and uses different internal MOSFET RDS(ON) (120 mΩ HS / 80 mΩ LS). | Supports higher-current loads like dual-core MCUs or Ethernet PHYs; requires revalidation of thermal layout due to increased power density. | Select when future-proofing for >1A peak loads or upgrading from MCP16321 without changing footprint. |
| MIC24046-3.3YML | 3.3V fixed output, 2A rating, 2.7–24V input, but uses valley current mode control and lacks integrated PG pin. | Requires external power-good monitoring; better suited for space-constrained designs needing 2A in same 3×3 mm QFN. | Choose when higher output current is mandatory and PG functionality can be implemented externally. |
Compared with MCP16321T-330E/NG, MCP16311T-330E/NG offers higher current headroom in identical packaging, while MIC24046-3.3YML trades PG integration for wider input range and valley-mode stability-both require layout review but enable migration paths for evolving power requirements.
Availability
MCP16321T-330E/NG is available at Aetrix Electronics and suitable for industrial control systems, embedded microcontroller power supplies, and battery-powered instrumentation requiring stable component supply and long-term obsolescence management.
Supply support for MCP16321T-330E/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, with a focus on embedded control and energy-efficient solutions.
The MCP16321/2 product line was designed specifically for high-efficiency, wide-input-voltage synchronous buck conversion in space-constrained industrial and consumer applications-emphasizing integration, thermal robustness, and ease of use.
FAQ
What is the maximum input voltage supported by the MCP16321T-330E/NG?
The MCP16321T-330E/NG supports an absolute maximum input voltage of 26.4V, with operational input range specified from 6.0V to 24V. Operation above 24V risks exceeding safe operating area limits and may trigger overvoltage protection or cause permanent damage. The device includes undervoltage lockout that disables operation below 5.5V (typical), ensuring reliable startup only within its validated range.
Does the MCP16321T-330E/NG require external feedback resistors for 3.3V output?
No, the MCP16321T-330E/NG is the fixed-output variant with internal 3.3V reference connected directly to the VFB pin. External resistors are unnecessary-pin 5 (VFB) is internally tied to the 3.3V regulation node. This eliminates tuning error, improves accuracy (±2%), and simplifies layout versus adjustable versions like MCP16321T-E/NG.
How does the BOOST capacitor function in the MCP16321T-330E/NG?
The BOOST capacitor (22 nF ceramic) connects between BOOST and SW pins to generate gate-drive voltage for the high-side N-MOSFET. During low-side conduction, SW drops near PGND, charging the capacitor. When high-side turns on, BOOST floats above VIN to fully enhance the switch. To prevent depletion at high duty cycles, the MCP16321T-330E/NG forces a 240 ns off-time every 8th cycle to recharge BOOST.
What thermal considerations apply to the MCP16321T-330E/NG in continuous 1A operation?
At 12VIN/3.3VOUT/1A, the MCP16321T-330E/NG dissipates ~1.2W. With θJA = 38.5°C/W and 25°C ambient, junction temperature reaches ~71°C-well below the 125°C max operating limit. Successful thermal design requires soldering the exposed pad (EP) to a ≥13.5 in² internal GND plane; omitting this increases θJA by >20°C.
Is the MCP16321T-330E/NG still recommended for new designs?
The MCP16321T-330E/NG is marked obsolete in Microchip's official documentation, with migration guidance pointing to MIC24046 or MCP16311/2. However, Aetrix Electronics maintains active inventory and provides full technical support for legacy designs, including BOM continuity, lifecycle coordination, and obsolescence mitigation strategies for ongoing production.
MCP16321T-330E/NG Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- -
- Package/Case:
- 16-VFQFN Exposed Pad
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Function:
- Step-Down
- Output Configuration:
- Positive
- Topology:
- Buck
- Output Type:
- Fixed
- Number of Outputs:
- 1
- Voltage - Input (Min):
- 6V
- Voltage - Input (Max):
- 24V
- Voltage - Output (Min/Fixed):
- 3.3V
- Voltage - Output (Max):
- -
- Current - Output:
- 1A
- Frequency - Switching:
- 1MHz
- Synchronous Rectifier:
- Yes
- Operating Temperature:
- -40°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 16-QFN (3x3)
MCP16321T-330E/NG FAQ
1.How can I place an order for MCP16321T-330E/NG through Aetrix?
Please submit a Request for Quotation (RFQ) for MCP16321T-330E/NG on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.
2.Are the price and stock information for MCP16321T-330E/NG reliable?
The price and inventory of MCP16321T-330E/NG are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MCP16321T-330E/NG is usually 5 days.
3.What payment methods are accepted for MCP16321T-330E/NG?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MCP16321T-330E/NG transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MCP16321T-330E/NG?
MCP16321T-330E/NG orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MCP16321T-330E/NG order is processed, you will receive an email with the shipment details and tracking number.
Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.
5.How can I obtain technical support or documentation for MCP16321T-330E/NG?
For technical support, including MCP16321T-330E/NG datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MCP16321T-330E/NG requirements.
6.How does Aetrix verify that MCP16321T-330E/NG is sourced from the original manufacturer or authorized distributors?
All MCP16321T-330E/NG products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that MCP16321T-330E/NG meets industry standards.
7.What is the process for return or replacement of MCP16321T-330E/NG?
All MCP16321T-330E/NG units undergo pre-shipment inspection (PSI). If there is an issue with MCP16321T-330E/NG, returns or replacements are accepted under the following conditions:
1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.
2.The issue is reported within 90 days of delivery.
3.The MCP16321T-330E/NG part is unused and in its original packaging.
Return procedure for MCP16321T-330E/NG:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
MCP16321T-330E/NG Tags
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MC33063ADR
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MC34063EBD-TR
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