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Microchip Technology MCP16322T-250E/NG
- Part No.:
- MCP16322T-250E/NG
- Manufacturer:
- Microchip Technology
- Package:
- 16-VFQFN Exposed Pad
- Datasheet:
-
MCP16322T-250E/NG.pdf
- Description:
- IC REG BUCK 2.5V 2A 16QFN
- Quantity:
- Payment:
- Shipping:
Inventory:3,283
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Product details
Overview
MCP16322T-250E/NG from Microchip Technology is a synchronous step-down DC-DC converter IC delivering up to 2A output current at fixed 2.5V output 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 via open-drain PG pin - used in industrial 12V-to-2.5V bias supplies and DSL modem power rails.
For engineers reviewing the MCP16322T-250E/NG datasheet, MCP16322T-250E/NG pinout, MCP16322T-250E/NG application, or MCP16322T-250E/NG equivalent, key selection criteria include verified 2A continuous output capability at 2.5V, QFN-16 (3×3 mm) thermal pad layout compatibility, UVLO threshold of 5.75V, and confirmed soft-start time of 4 ms for inrush control in embedded power systems.
Technical Context
The MCP16322T-250E/NG implements fixed-frequency (0.9–1.1 MHz) peak current mode control with internal slope compensation to prevent subharmonic oscillation above 50% duty cycle. Its architecture integrates both high-side and low-side N-channel MOSFETs with validated on-resistances of 180 mΩ and 120 mΩ respectively, enabling high-efficiency synchronous rectification without external drivers.
It features internal compensation, stable operation with ceramic output capacitors, and dual ground separation (SGND for analog/control, PGND for power switching), supporting robust noise immunity in mixed-signal environments. The device includes VOUT overvoltage protection (103% threshold), undervoltage lockout (5.75V start, 0.65V hysteresis), and thermal shutdown at 170°C with 10°C hysteresis.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 2.5V ±2% - ensures stable logic-level supply for microcontrollers and interface ICs without external feedback resistors. |
| Max Output Current | 2A continuous - supports high-current digital loads such as FPGA I/O banks or multi-core MCU cores. |
| Input Voltage Range | 6.0V to 24V - compatible with 12V industrial rails and wide-range wall adapters, including automotive battery transients. |
| Switching Frequency | 1 MHz (±10%) - enables compact 4.7 µH inductor and low-ESR ceramic capacitor designs, minimizing board area. |
| Efficiency | Up to 95% typical - reduces thermal load in sealed enclosures and extends battery runtime in SLA-powered devices. |
| Thermal Resistance | θJA = 38.5°C/W - requires minimum 13.5 in² internal ground plane for full 2A operation at +125°C junction temperature. |
| Shutdown Current | 5–10 µA - enables ultra-low-power system sleep modes without external load switches. |
Pinout & Package
Package: 16-pin QFN (3×3 mm) with exposed thermal pad (EP), RoHS-compliant, moisture sensitivity level 3.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 12, 13, 16 SW | Switch node | Common drain connection of internal high-side and low-side MOSFETs; must connect directly to inductor and boost capacitor with short, wide trace to minimize ringing. |
| 2, 3, 11 VIN | Input power supply | Distributes 6–24V input to internal bias circuitry and high-side driver; requires local 2×10 µF decoupling to SGND/PGND. |
| 4 SGND | Signal ground | Analog reference and control loop ground - must be isolated from PGND except at single-point PCB connection. |
| 5 VFB | Feedback input | Internally tied to 2.5V reference for fixed-output version; not externally connected in MCP16322T-250E/NG. |
| 6, 7 NC | No connection | Unbonded pins - must remain unconnected and unpopulated on PCB. |
| 8 PG | Power good indicator | Open-drain output pulled high externally to ≤6V; asserts after 10 ms delay when VOUT exceeds 93% of 2.5V (2.325V). |
| 9 EN | Enable control | Logic-high (>2.2V) enables regulation; internally pulled up to 4.2V - pull low (<0.8V) to enter 5 µA shutdown state. |
| 10 BOOST | Bootstrap voltage | Drives high-side gate; requires 22 nF ceramic capacitor between BOOST and SW to sustain >100% duty-cycle operation. |
| 14, 15 PGND | Power ground | Return path for low-side MOSFET and synchronous rectifier - must connect to EP and system ground with low-inductance copper pour. |
| 17 EP | Exposed thermal pad | Electrically isolated internal thermal path; must be soldered to solid GND plane for thermal performance and EMI reduction. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated dual N-MOSFETs | Eliminates need for external power switches and gate drivers, reducing BOM count and layout complexity for 2A buck designs. |
| Internal soft-start | 4 ms controlled VOUT ramp prevents inrush current and overshoot during power-up, protecting downstream capacitors and ICs. |
| Ceramic-capacitor stability | Enables use of small, low-ESR MLCCs instead of bulk electrolytics - improves reliability and saves space in compact modules. |
| VOUT overvoltage protection | Tri-states SW pins if output exceeds 103% of 2.5V (2.575V), preventing damage to 2.5V logic interfaces during fault conditions. |
| Separate SGND/PGND | Reduces coupling of switching noise into error amplifier and reference circuits, maintaining tight output regulation under dynamic load steps. |
Applications
| PIC®/dsPIC® Microcontroller Bias Supply | 12V Industrial Input DC-DC Conversion |
|---|---|
Use Scenario: Powering core and I/O domains of PIC32MX or dsPIC33EP microcontrollers in programmable logic controllers (PLCs) with 12V backplane input. IC Role / Device Role / Timing Role: Primary 2.5V synchronous buck regulator supplying regulated core voltage with fast transient response to CPU burst loads. Use Value: Delivers 2A continuous current with <±2% output tolerance across -40°C to +125°C, ensuring deterministic MCU timing and flash programming voltage compliance. | Use Scenario: Converting 12V factory automation bus to 2.5V for sensor signal conditioning and ADC reference in industrial IoT gateways. IC Role / Device Role / Timing Role: High-efficiency point-of-load regulator with integrated MOSFETs, eliminating external FETs and driver ICs in space-constrained DIN-rail modules. Use Value: Achieves >92% efficiency at 1.5A load, reducing thermal dissipation by 35% versus discrete solutions and enabling fanless enclosure design. |
| DSL Cable Modem Power Rail | SLA Battery Powered Devices |
Use Scenario: Generating stable 2.5V supply for Ethernet PHYs and packet processors in residential DSL modems powered from 12V AC/DC adapter. IC Role / Device Role / Timing Role: Fixed-output buck converter with PG pin synchronized to system reset controller for safe boot sequencing. Use Value: PG assertion delay of 10 ms ensures clean 2.5V rail stabilization before enabling Ethernet MAC, preventing link negotiation failures. | Use Scenario: Regulating 12–24V SLA battery output to 2.5V for portable medical monitors with long standby life requirements. IC Role / Device Role / Timing Role: Low-quiescent-current (2.3 mA switching, 5 µA shutdown) buck regulator enabling multi-week battery runtime in sleep mode. Use Value: Shutdown current below 10 µA minimizes self-discharge, extending usable battery life by >18% compared to legacy 50 µA 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 |
|---|---|---|---|
| MCP16312T-250E/NG | Same pinout, identical 2.5V fixed output, but uses voltage-mode control instead of peak current mode; lower light-load efficiency due to lack of PFM mode. | Suitable for cost-sensitive designs where transient response is less critical; lacks cycle-by-cycle current limiting. | Select MCP16312T-250E/NG only if simplified compensation and reduced EMI sensitivity are prioritized over dynamic load performance. |
| MIC24046-2.5YMT | 2.5V fixed output, 3A rating, 2.2 MHz switching, different QFN-16 (4×4 mm) package; no integrated PG pin; requires external soft-start capacitor. | Better suited for higher-current or smaller-footprint applications where 2A is insufficient or board space is extremely constrained. | Choose MIC24046-2.5YMT when upgrading to 3A output or migrating to higher-frequency designs requiring smaller magnetics. |
Compared with MCP16312T-250E/NG, the MCP16322T-250E/NG delivers superior transient response and inherent cycle-by-cycle current limiting, while versus MIC24046-2.5YMT it offers direct PG integration and proven thermal performance in 3×3 mm QFN, making it optimal for industrial 2A applications requiring reliability and ease of qualification.
Availability
MCP16322T-250E/NG is available at Aetrix Electronics and suitable for industrial PLCs, DSL modems, SLA-powered medical monitors, and PIC® microcontroller bias supplies requiring stable component supply with full lifecycle support.
Supply support for MCP16322T-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 microcontroller, analog, and Flash-IP solutions, serving automotive, industrial, consumer, and communications markets with vertically integrated silicon and software platforms.
The MCP1632x family was designed specifically for high-input-voltage, high-efficiency synchronous buck conversion in space-constrained industrial and networking equipment, emphasizing integrated power stages and robust protection features.
FAQ
What is the maximum input voltage supported by the MCP16322T-250E/NG?
The MCP16322T-250E/NG supports an absolute maximum input voltage of 26.4V, with normal operation specified from 6.0V to 24V. Its undervoltage lockout starts at 5.75V (typical), ensuring reliable startup across industrial 12V and automotive 24V supply rails. Operation above 24V risks permanent damage per Absolute Maximum Ratings.
Does the MCP16322T-250E/NG require external feedback resistors for its 2.5V output?
No, the MCP16322T-250E/NG is the fixed-output variant with internal 2.5V reference connected directly to the VFB pin. External resistors are unnecessary - VFB (Pin 5) must remain unconnected in this configuration. Only adjustable versions (e.g., MCP16322T-E/NG) require an external resistor divider.
How does the PG pin of the MCP16322T-250E/NG behave during startup and fault conditions?
The PG pin of the MCP16322T-250E/NG is an open-drain output that remains low until VOUT exceeds 93% of 2.5V (2.325V), then waits 10 ms before pulling high. If VOUT drops below 91% (2.275V) or exceeds 103% (2.575V), PG immediately goes low. It tolerates up to 6V pull-up voltage and sinks ≥0.3 mA when asserted.
Can the MCP16322T-250E/NG operate with ceramic output capacitors only?
Yes, the MCP16322T-250E/NG is explicitly characterized for stability with ceramic output capacitors - typically 2×22 µF X5R/X7R MLCCs - thanks to internal compensation and optimized control loop design. No tantalum or electrolytic capacitors are required, simplifying design and improving long-term reliability.
What thermal management is required for full 2A operation of the MCP16322T-250E/NG?
For continuous 2A operation at +125°C ambient, the MCP16322T-250E/NG requires the exposed thermal pad (EP) soldered to a minimum 13.5 in² internal copper ground plane (1 oz) per JEDEC JESD51-7. Without adequate copper area, junction temperature exceeds 150°C, triggering thermal shutdown at 170°C with 10°C hysteresis.
MCP16322T-250E/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):
- 2.5V
- Voltage - Output (Max):
- -
- Current - Output:
- 2A
- 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)
MCP16322T-250E/NG FAQ
1.How can I place an order for MCP16322T-250E/NG through Aetrix?
Please submit a Request for Quotation (RFQ) for MCP16322T-250E/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 MCP16322T-250E/NG reliable?
The price and inventory of MCP16322T-250E/NG are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MCP16322T-250E/NG is usually 5 days.
3.What payment methods are accepted for MCP16322T-250E/NG?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MCP16322T-250E/NG transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MCP16322T-250E/NG?
MCP16322T-250E/NG orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MCP16322T-250E/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 MCP16322T-250E/NG?
For technical support, including MCP16322T-250E/NG datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MCP16322T-250E/NG requirements.
6.How does Aetrix verify that MCP16322T-250E/NG is sourced from the original manufacturer or authorized distributors?
All MCP16322T-250E/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 MCP16322T-250E/NG meets industry standards.
7.What is the process for return or replacement of MCP16322T-250E/NG?
All MCP16322T-250E/NG units undergo pre-shipment inspection (PSI). If there is an issue with MCP16322T-250E/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 MCP16322T-250E/NG part is unused and in its original packaging.
Return procedure for MCP16322T-250E/NG:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
MCP16322T-250E/NG Tags
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