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Microchip Technology MCP16321T-500E/NG
- Part No.:
- MCP16321T-500E/NG
- Manufacturer:
- Microchip Technology
- Package:
- 16-VFQFN Exposed Pad
- Datasheet:
-
MCP16321T-500E/NG.pdf
- Description:
- IC REG BUCK 5V 1A 16QFN
- Quantity:
- Payment:
- Shipping:
Inventory:4,760
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Product details
Overview
MCP16321T-500E/NG from Microchip Technology is a synchronous step-down DC-DC converter IC delivering 1A continuous output current with fixed 5.0V output voltage, ±2% accuracy, operating from 6.0V to 24V input. It integrates high-side (180 mΩ) and low-side (120 mΩ) N-channel MOSFETs, employs peak current mode control at 1 MHz, and includes power-good indication (PG), enable (EN), and thermal/overvoltage protection - used in industrial 12V-to-5V bias supplies and DSL/cable modem power rails.
For engineers reviewing the MCP16321T-500E/NG datasheet, MCP16321T-500E/NG pinout, MCP16321T-500E/NG application, or MCP16321T-500E/NG equivalent, key selection criteria include its 5V fixed output, QFN-16 (3×3 mm) package with exposed thermal pad, 1A load capability, UVLO threshold of 5.75V, and compatibility with ceramic output capacitors without external compensation.
Technical Context
The MCP16321T-500E/NG implements a fixed-frequency (0.9–1.1 MHz) peak current mode control architecture with internal slope compensation, enabling fast transient response and stable regulation across input steps and load changes. Its integrated dual-NMOS switch pair - high-side RDS(ON) = 180 mΩ and low-side RDS(ON) = 120 mΩ - minimizes conduction loss while supporting up to 95% typical efficiency at full load.
Control features include internal soft-start (4 ms), cycle-by-cycle current limiting (1.4–2.4 A for MCP16321), undervoltage lockout (5.75 V start, 0.65 V hysteresis), overtemperature shutdown (170°C), and VOUT overvoltage protection (103% threshold). The PG pin provides open-drain power-good signaling with 10 ms release delay after VOUT exceeds 93% of nominal.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 5.0 V ±2% - eliminates need for external feedback resistors; supports logic-level 5V rail generation. |
| Max Output Current | 1 A continuous - sufficient for powering PIC®/dsPIC® microcontrollers, USB peripherals, or FPGA I/O banks. |
| Input Voltage Range | 6.0 V to 24 V - accommodates wide industrial input sources including 12V and 24V bus systems. |
| Switching Frequency | 1 MHz (±10%) - enables compact magnetics (e.g., 4.7 µH inductor) and reduces output ripple without sacrificing efficiency. |
| Efficiency | Up to 95% typical - achieved via low-RDS(ON) integrated switches and synchronous rectification. |
| UVLO Threshold | 5.75 V (typical), 0.65 V hysteresis - prevents erratic startup during brown-out conditions on marginal 6V inputs. |
| Thermal Shutdown | 170°C junction temperature - protects against sustained overload or poor PCB thermal design. |
Pinout & Package
Package: 16-pin QFN (3 mm × 3 mm, 0.5 mm pitch) with exposed thermal pad (EP) requiring PCB connection to SGND/PGND for thermal and electrical integrity.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 12, 13, 16 SW | Switch node | Connects to inductor and bootstrap capacitor; carries high di/dt switching current - requires short, wide trace routing. |
| 2, 3, 11 VIN | Input supply | Dual-purpose: powers internal circuitry and high-side gate driver; decoupled with ≥2×10 µF ceramic capacitors near pins. |
| 4 SGND | Signal ground | Analog reference and control loop ground - must be isolated from noisy PGND except at single-point connection. |
| 5 VFB | Feedback input | Internally tied to 5.0V reference for fixed-output version; not externally connected in MCP16321T-500E/NG. |
| 6, 7 NC | No connection | Unbonded die pads - must remain unconnected on PCB; no pull-up/down or routing. |
| 8 PG | Power-good indicator | Open-drain active-low output; pulled up to ≤6V; asserts high after 10 ms once VOUT reaches ≥93% of 5.0V. |
| 9 EN | Enable input | Logic-compatible (VIH ≥2.2 V, VIL ≤0.8 V); internally pulled up to 4.2 V; pulls device into 5 µA shutdown when low. |
| 10 BOOST | Bootstrap supply | Drives high-side NMOS gate; requires 22 nF ceramic capacitor between BOOST and SW pins. |
| 14, 15 PGND | Power ground | Low-side switch return path - separate from SGND to prevent noise coupling into control circuitry. |
| 17 EP | Exposed thermal pad | Electrically isolated from SGND/PGND internally; must be soldered to large GND copper area for thermal dissipation. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated dual-NMOS power stage | Eliminates external MOSFETs and drivers; 180 mΩ high-side + 120 mΩ low-side enables >90% efficiency at 1A/5V. |
| Internal compensation | Removes need for external Type-II/III compensation network - simplifies layout and reduces BOM count. |
| Ceramic capacitor stability | Supports low-ESR ceramic output caps (e.g., 2×22 µF) without oscillation - avoids costly tantalum or polymer alternatives. |
| Power-good (PG) with timing | Provides system-level sequencing assurance: PG goes high only after 10 ms stable regulation - critical for FPGA/microcontroller reset coordination. |
| Peak current mode control | Delivers superior line/load transient response vs. voltage-mode control; enables single-loop stability across wide VIN/VOUT ranges. |
Applications
| PIC®/dsPIC® Microcontroller Bias Supply | 12V Industrial Input DC-DC Conversion |
|---|---|
Use Scenario: Powers 5V I/O and core logic of PIC32MX or dsPIC33EP microcontrollers in programmable logic controllers (PLCs). IC Role / Device Role / Timing Role: Primary 5V buck regulator supplying MCU VDD, AVDD, and peripheral rails with tight voltage tolerance and low noise. Use Value: Fixed 5.0V output ensures compliance with MCU datasheet requirements; 1A rating supports simultaneous USB, CAN, and analog peripherals. | Use Scenario: Converts unregulated 12V industrial bus to clean 5V for sensor interfaces, digital isolators, and communication transceivers. IC Role / Device Role / Timing Role: Main point-of-load regulator in DIN-rail mounted automation modules with wide input tolerance and thermal robustness. Use Value: 6–24V input range handles brownouts and surges; QFN-16 package with EP enables convection-cooled operation in sealed enclosures. |
| DSL/Cable Modem Power Rail | Wall Cube Regulation |
Use Scenario: Generates 5V rail for Ethernet PHYs, DOCSIS chipsets, and front-panel LEDs in residential broadband gateways. IC Role / Device Role / Timing Role: Secondary regulated output derived from primary AC-DC stage; must meet EMI and efficiency standards for Class B devices. Use Value: 1 MHz switching allows small filter components; 95% efficiency reduces heat buildup in compact plastic housings. | Use Scenario: Replaces linear regulators in universal-input wall adapters delivering 5V/1A to consumer electronics. IC Role / Device Role / Timing Role: High-efficiency synchronous buck replacing obsolete 7805-based designs; improves no-load quiescent current performance. Use Value: 5 µA shutdown current extends battery backup time; EN pin enables remote on/off control via microcontroller GPIO. |
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-E/MS | Same 1A rating, adjustable output (0.8V–5.5V), 3×3 QFN-10 package, no PG pin, lower IQ (2.3 mA switching) | Lacks power-good signaling and fixed-5V option; better suited for multi-rail systems requiring flexibility | Select when output voltage tuning or smaller footprint is prioritized over PG monitoring and fixed 5V simplicity. |
| MIC24046-5.0YMT-TZ | 5V fixed, 2A output, 2.7–24V input, 1.2MHz, integrated PG, but larger 16-pin TQFN (4×4 mm) | Higher current capability and wider input range; different pinout and thermal pad layout | Choose when 2A headroom or extended low-VIN operation (down to 2.7V) is required; verify PCB layout compatibility. |
Compared with MCP16311T-E/MS, MCP16321T-500E/NG offers guaranteed 5V output and system-level power sequencing via PG, while MIC24046-5.0YMT-TZ provides higher current and broader input range at the cost of larger footprint and non-drop-in replacement.
Availability
MCP16321T-500E/NG is available at Aetrix Electronics and suitable for industrial automation, broadband communications equipment, and embedded microcontroller power supplies requiring stable component supply and long-term manufacturability.
Supply support for MCP16321T-500E/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, interface, and power management semiconductors, headquartered in Chandler, Arizona.
The MCP16321/2 product line was designed specifically for high-efficiency, space-constrained synchronous buck conversion in industrial, telecom, and consumer applications where minimal external components and robust protection features are essential.
FAQ
What is the output voltage tolerance of the MCP16321T-500E/NG under full load?
The MCP16321T-500E/NG delivers a fixed 5.0V output with ±2% tolerance in PWM mode at 1A load, verified across -40°C to +125°C junction temperature. This specification ensures reliable operation for 5V-tolerant logic interfaces without requiring post-regulation filtering or trimming.
Does the MCP16321T-500E/NG require external compensation components?
No, the MCP16321T-500E/NG includes fully integrated internal compensation for its peak current mode control loop. This eliminates external RC networks typically needed in voltage-mode buck controllers, reducing design complexity and board area while maintaining stability with ceramic output capacitors.
How does the power-good (PG) signal behave during startup of the MCP16321T-500E/NG?
During startup, the PG pin remains low until the output voltage reaches ≥93% of 5.0V (i.e., ≥4.65V). Once that threshold is crossed, an internal 10 ms timer begins; only after this delay does PG transition high (open-drain, pulled up externally), confirming stable regulation - a critical feature for coordinated system reset sequencing in the MCP16321T-500E/NG.
Can the MCP16321T-500E/NG operate with input voltages below 6V?
No - the MCP16321T-500E/NG has a minimum input voltage of 6.0V per absolute maximum ratings and UVLO behavior. Attempting operation below 6V will cause the device to remain in undervoltage lockout, with EN inactive and SW disabled. The UVLO start threshold is 5.75V (typical), ensuring reliable turn-on only within the specified 6–24V range.
What thermal management considerations apply to the MCP16321T-500E/NG in continuous 1A operation?
At 1A/5V output with 12V input, the MCP16321T-500E/NG dissipates ~0.5W. Its 38.5°C/W θJA (4-layer PCB, 13.5 in² ground plane) implies ~20°C rise above ambient. To maintain <125°C junction temperature, ensure the exposed thermal pad (EP) is soldered to ≥2 cm² of inner-layer GND copper and avoid enclosing the device in thermally restrictive housings.
MCP16321T-500E/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):
- 5V
- 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-500E/NG FAQ
1.How can I place an order for MCP16321T-500E/NG through Aetrix?
Please submit a Request for Quotation (RFQ) for MCP16321T-500E/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-500E/NG reliable?
The price and inventory of MCP16321T-500E/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-500E/NG is usually 5 days.
3.What payment methods are accepted for MCP16321T-500E/NG?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MCP16321T-500E/NG transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MCP16321T-500E/NG?
MCP16321T-500E/NG orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MCP16321T-500E/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-500E/NG?
For technical support, including MCP16321T-500E/NG datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MCP16321T-500E/NG requirements.
6.How does Aetrix verify that MCP16321T-500E/NG is sourced from the original manufacturer or authorized distributors?
All MCP16321T-500E/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-500E/NG meets industry standards.
7.What is the process for return or replacement of MCP16321T-500E/NG?
All MCP16321T-500E/NG units undergo pre-shipment inspection (PSI). If there is an issue with MCP16321T-500E/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-500E/NG part is unused and in its original packaging.
Return procedure for MCP16321T-500E/NG:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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