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Microchip Technology MCP16321T-180E/NG
- Part No.:
- MCP16321T-180E/NG
- Manufacturer:
- Microchip Technology
- Package:
- 16-VFQFN Exposed Pad
- Datasheet:
-
MCP16321T-180E/NG.pdf
- Description:
- IC REG BUCK 1.8V 1A 16QFN
- Quantity:
- Payment:
- Shipping:
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Product details
Overview
MCP16321T-180E/NG from Microchip Technology is a synchronous step-down DC-DC converter IC with integrated 180 mΩ high-side and 120 mΩ low-side N-channel MOSFETs, delivering up to 1 A continuous output current at fixed 1.8 V (±2% accuracy) from 6–24 V input. It operates at 1 MHz fixed frequency, features internal compensation, soft-start, power-good indication, and thermal/overvoltage/undervoltage protection - deployed in industrial 12V DC-DC conversion and PIC® microcontroller bias supplies.
For engineers reviewing the MCP16321T-180E/NG datasheet, MCP16321T-180E/NG pinout, MCP16321T-180E/NG application, or MCP16321T-180E/NG equivalent, key selection criteria include its 1.8 V fixed output, QFN-16 (3×3 mm) package with exposed thermal pad, 1 A load capability, UVLO threshold of 5.75 V, and compatibility with ceramic output capacitors without external compensation.
Technical Context
The MCP16321T-180E/NG implements peak current mode control with internal slope compensation and a 1 MHz oscillator, enabling fast transient response and stable regulation across input steps and load changes. Its architecture integrates a floating high-side gate driver powered by a bootstrap capacitor between BOOST and SW pins, replenished every eighth cycle for duty cycles approaching 100%.
It uses separate SGND (signal ground) and PGND (power ground) pins to isolate analog control circuitry from switching noise, and includes dedicated overtemperature shutdown (170°C trip, 160°C release), VOUT overvoltage protection (103% threshold), and undervoltage lockout with 0.65 V hysteresis - all implemented in silicon without external components.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 1.8 V ±2% - eliminates need for external feedback resistors and ensures tight regulation under 1 A load and temperature variation. |
| Input Voltage Range | 6.0 V to 24 V - supports wide industrial and automotive supply rails including 12 V nominal systems with ripple and dropout margin. |
| Max Output Current | 1 A continuous - sufficient for powering single-core microcontrollers, FPGAs, or sensor interfaces without external current boosting. |
| Switching Frequency | 1 MHz ±10% - enables use of compact 4.7 µH inductors and low-ESR ceramic capacitors for minimal board area. |
| High-Side RDS(ON) | 180 mΩ typical - reduces conduction loss at full load, contributing to >92% efficiency at 12 VIN/1.8 VOUT, 1 A. |
| UVLO Threshold | 5.75 V (typical) with 0.65 V hysteresis - prevents erratic startup during brown-out conditions and ensures clean enable/disable sequencing. |
| Thermal Shutdown | 170°C die temperature with 10°C hysteresis - protects against sustained overload or poor PCB thermal design without requiring external thermal sensors. |
Pinout & Package
Package: 16-pin QFN (3 mm × 3 mm, 0.5 mm pitch) with exposed thermal pad (EP) - requires solder connection of EP to PCB ground plane for thermal performance and EMI reduction.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| SW (Pins 1, 12, 13, 16) | Switch node | Drain of low-side NMOS and source of high-side NMOS - connects directly to inductor and BOOST capacitor; multiple pins reduce trace inductance and improve thermal dissipation. |
| VIN (Pins 2, 3, 11) | Input power supply | Dual-path input for high-current delivery and reduced IR drop - must be decoupled with ≥2×10 µF ceramic capacitors placed near pins. |
| SGND (Pin 4) | Signal ground reference | Reference for error amplifier, VFB comparator, and internal bias - must be routed separately from PGND to avoid noise coupling into regulation loop. |
| VFB (Pin 5) | Feedback input | Internally connected to 1.8 V reference - no external resistor divider required; open-circuit or misconnection disables regulation. |
| NC (Pins 6, 7) | No connection | Unbonded die pads - must remain unconnected and unstubbed on PCB to prevent parasitic coupling or ESD paths. |
| PG (Pin 8) | Power-good indicator | Open-drain active-low output - pulled high externally to ≤6 V; asserts after 10 ms delay once VOUT exceeds 93% of 1.8 V (1.674 V). |
| EN (Pin 9) | Enable control | Logic-level input (VIH ≥2.2 V, VIL ≤0.8 V); internally pulled up to 4.2 V - pulling low reduces quiescent current to 5 µA for power shedding. |
| BOOST (Pin 10) | Bootstrap voltage supply | Drives high-side NMOS gate - requires 22 nF ceramic capacitor between BOOST and SW to sustain gate drive above VIN during high-duty-cycle operation. |
| PGND (Pins 14, 15) | Power ground return | Return path for low-side NMOS and internal power switches - must connect to local ground plane under EP and tie to system ground at single point. |
| EP (Pin 17) | Exposed thermal pad | Electrically isolated copper pad - must be soldered to solid PCB ground plane for thermal resistance θJA = 38.5°C/W and EMI suppression. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated dual NMOS power stage | 180 mΩ high-side + 120 mΩ low-side MOSFETs eliminate external switch losses and simplify layout versus controller-only solutions. |
| Internal compensation network | Eliminates external Type-II/III compensation components - reduces BOM count and design validation effort for stable operation with ceramic output caps. |
| Power-good (PG) with 10 ms delay | Provides sequenced system enable signal - allows downstream logic to initialize only after regulated 1.8 V rail is within specification and stable. |
| Cycle-by-cycle current limiting | Prevents MOSFET failure during short-circuit or overload - limits peak switch current to 1.4–2.4 A depending on VIN, independent of external sensing. |
| Stable with ceramic capacitors | Supports low-ESR, high-frequency ceramic output caps (e.g., 2×22 µF X5R) - avoids bulk electrolytic capacitors and improves reliability and temperature stability. |
Applications
| PIC® Microcontroller Bias Supply | 12V Industrial DC-DC Conversion |
|---|---|
Use Scenario: Powering 32-bit PIC32MX or dsPIC33CH microcontrollers requiring tightly regulated 1.8 V core voltage from a 12 V rail in factory automation controllers. IC Role / Device Role / Timing Role: Primary core voltage regulator providing low-noise, low-ripple 1.8 V at up to 1 A with fast load transient response to handle CPU burst activity. Use Value: Enables reliable microcontroller operation across -40°C to +125°C ambient while reducing solution size vs. discrete buck designs using external MOSFETs and compensation. | Use Scenario: Converting unregulated 12 V from industrial power supplies to stable 1.8 V for FPGA I/O banks or high-speed ADC digital cores in programmable logic controllers. IC Role / Device Role / Timing Role: Synchronous buck regulator delivering precise 1.8 V with <1% line/load regulation and <10 mV ripple - critical for noise-sensitive mixed-signal circuits. Use Value: Achieves >93% efficiency at full load, minimizing heat generation in sealed enclosures, and eliminates need for heatsinks or airflow-dependent cooling. |
| DSL Cable Modem Power Rail | SLA Battery-Powered Devices |
Use Scenario: Generating 1.8 V for Ethernet PHY and packet processor ICs in DSL modems operating from 12 V wall adapters with variable input ripple. IC Role / Device Role / Timing Role: Fixed-output buck regulator with UVLO (5.75 V) and overvoltage protection - ensures clean power-up and safe shutdown during adapter disconnect or surge events. Use Value: Maintains regulation down to 6 V input, supporting brown-out tolerance during AC line sags, and delivers consistent 1.8 V even with ±10% input variation. | Use Scenario: Powering low-power wireless sensor nodes powered by 12 V sealed lead-acid (SLA) batteries in remote monitoring systems. IC Role / Device Role / Timing Role: High-efficiency step-down regulator with 5 µA shutdown current - extends battery life during sleep modes while enabling rapid wake-up via EN pin control. Use Value: Reduces quiescent consumption by >95% vs. linear regulators, enabling multi-year operation on a single SLA charge without frequent replacement. |
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-180E/NG | Same 1.8 V fixed output, but rated for 2 A max output current and higher 24 V absolute max input rating (vs. 26.4 V for MCP16321). | Supports higher current loads (e.g., dual-core MCUs) and wider input transients - suitable when future-proofing for increased load or harsher input conditions. | Select MCP16311T-180E/NG if >1 A output headroom or enhanced transient robustness is required; otherwise MCP16321T-180E/NG offers optimal cost/performance for 1 A applications. |
| MP2451DT-LF-Z | 1.8 V adjustable via external resistors (not fixed), 2 A output, 36 V max input, but lacks integrated PG pin and requires external compensation. | Used where output flexibility or higher input voltage tolerance is needed, but adds design complexity and component count for feedback and compensation. | Choose MP2451DT-LF-Z only if adjustable output or >24 V input capability is mandatory; MCP16321T-180E/NG provides simpler, more integrated 1.8 V solution with PG and internal compensation. |
Compared with MCP16311T-180E/NG and MP2451DT-LF-Z, the MCP16321T-180E/NG delivers optimized integration for 1 A, 1.8 V fixed-output applications - offering internal compensation, power-good signaling, and minimal external components without sacrificing thermal or electrical robustness in industrial environments.
Availability
MCP16321T-180E/NG is available at Aetrix Electronics and suitable for industrial embedded systems, PIC® microcontroller bias supplies, and 12V-to-1.8V DC-DC conversion requiring stable component supply and long-term lifecycle support.
Supply support for MCP16321T-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 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, space-constrained synchronous buck conversion in industrial, automotive, and consumer applications - emphasizing integration, thermal resilience, and ease of implementation with minimal external components.
FAQ
What is the output voltage tolerance of the MCP16321T-180E/NG under full 1 A load?
The MCP16321T-180E/NG delivers a fixed 1.8 V output with ±2% tolerance in PWM mode at 1 A load, corresponding to 1.764 V to 1.836 V across -40°C to +125°C junction temperature. This specification is guaranteed per DS20002285B, Table 1-1, and applies with recommended 2×22 µF ceramic output capacitance and 4.7 µH inductor.
Does the MCP16321T-180E/NG require external compensation components?
No, the MCP16321T-180E/NG includes fully integrated internal compensation - eliminating the need for external Type-II or Type-III compensation networks. This simplifies design, reduces BOM count, and ensures stable operation with ceramic output capacitors as specified in the datasheet's typical application circuits.
How does the power-good (PG) pin of the MCP16321T-180E/NG behave during startup?
The PG pin of the MCP16321T-180E/NG remains low until the output voltage exceeds 93% of 1.8 V (1.674 V), then initiates a 10 ms internal timer before releasing the open-drain output. Once released, an external pull-up (≤6 V) pulls PG high, signaling valid regulation - ensuring downstream logic only activates after stable 1.8 V is established.
Can the MCP16321T-180E/NG operate from a 6 V input supply?
Yes, the MCP16321T-180E/NG supports input voltages from 6.0 V to 24 V. At 6 V input, it maintains regulation at 1.8 V output up to its full 1 A rating, though efficiency drops to ~85% (per Figure 2-4). UVLO releases at 5.75 V (typical), ensuring reliable startup even with marginal input sources.
What thermal management is required for the MCP16321T-180E/NG in continuous 1 A operation?
For continuous 1 A operation at 12 VIN/1.8 VOUT, the MCP16321T-180E/NG dissipates ~1.2 W. With θJA = 38.5°C/W and 25°C ambient, junction temperature reaches ~72°C - well below the 125°C max operating limit. A properly soldered exposed thermal pad (EP) to a ≥13.5 in² internal ground plane is mandatory per datasheet layout guidelines.
MCP16321T-180E/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):
- 1.8V
- 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-180E/NG FAQ
1.How can I place an order for MCP16321T-180E/NG through Aetrix?
Please submit a Request for Quotation (RFQ) for MCP16321T-180E/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-180E/NG reliable?
The price and inventory of MCP16321T-180E/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-180E/NG is usually 5 days.
3.What payment methods are accepted for MCP16321T-180E/NG?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MCP16321T-180E/NG transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MCP16321T-180E/NG?
MCP16321T-180E/NG orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MCP16321T-180E/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-180E/NG?
For technical support, including MCP16321T-180E/NG datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MCP16321T-180E/NG requirements.
6.How does Aetrix verify that MCP16321T-180E/NG is sourced from the original manufacturer or authorized distributors?
All MCP16321T-180E/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-180E/NG meets industry standards.
7.What is the process for return or replacement of MCP16321T-180E/NG?
All MCP16321T-180E/NG units undergo pre-shipment inspection (PSI). If there is an issue with MCP16321T-180E/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-180E/NG part is unused and in its original packaging.
Return procedure for MCP16321T-180E/NG:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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