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Microchip Technology MCP16321T-ADJE/NG
- Part No.:
- MCP16321T-ADJE/NG
- Manufacturer:
- Microchip Technology
- Package:
- 16-VFQFN Exposed Pad
- Datasheet:
-
MCP16321T-ADJE/NG.pdf
- Description:
- IC REG BUCK ADJ 1A 16QFN
- Quantity:
- Payment:
- Shipping:
Inventory:1,279
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Product details
Overview
MCP16321T-ADJE/NG from Microchip Technology is a synchronous step-down DC-DC converter IC delivering up to 1A output current with adjustable 0.9V–5.0V output voltage, 1 MHz fixed switching frequency, ±1.5% reference accuracy, and integrated 180 mΩ high-side / 120 mΩ low-side N-channel MOSFETs. It operates from 6.0V–24V input and targets PIC®/dsPIC® microcontroller bias supplies and industrial 12V DC-DC conversion.
For engineers reviewing the MCP16321T-ADJE/NG datasheet, MCP16321T-ADJE/NG pinout, MCP16321T-ADJE/NG application, or MCP16321T-ADJE/NG equivalent, key selection criteria include its adjustable VOUT range, thermal shutdown at 170°C, power-good (PG) open-drain reporting, UVLO threshold of 5.75V, and QFN-16 (3×3 mm) package with exposed thermal pad.
Technical Context
The MCP16321T-ADJE/NG implements peak current mode control with internal slope compensation and fixed 1 MHz oscillator, enabling stable regulation under line and load transients. Its architecture integrates both high-side and low-side N-MOSFETs, bootstrap gate drive for the high-side switch, and internal soft-start to limit inrush current.
It supports PFM mode at light loads for improved efficiency, includes cycle-by-cycle current limiting, overvoltage protection at 103% VOUT, and undervoltage lockout with 0.65V hysteresis. The device uses internal compensation and is stable with ceramic output capacitors.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 6.0V to 24V - supports wide industrial and automotive supply rails without external pre-regulation |
| Output Current | 1A continuous - sufficient for single-core microcontrollers and low-power peripherals |
| Output Voltage Range | 0.9V to 5.0V adjustable - enables precise core voltage scaling for diverse SoCs and MCUs |
| Reference Accuracy | ±1.5% - ensures tight output regulation across temperature and load for sensitive analog/digital circuits |
| Switching Frequency | 1 MHz (±10%) - allows compact 4.7 µH inductors and small ceramic output capacitors |
| High-Side RDS(ON) | 180 mΩ - reduces conduction loss and improves full-load efficiency up to 95% |
| UVLO Threshold | 5.75V (typical), 5.5V–6.0V range - prevents erratic startup during brown-out conditions |
Pinout & Package
Package: 16-pin QFN (3 mm × 3 mm, 0.5 mm pitch) with exposed thermal pad (EP) requiring PCB GND connection for thermal performance and EMI control.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| SW (Pins 1,12,13,16) | Switch node | Connects to inductor and BOOST capacitor; carries high di/dt switching current - requires short, wide PCB trace |
| VIN (Pins 2,3,11) | Input power supply | Distributes 6–24V input to internal bias and high-side driver; decoupled by dual 10 µF ceramics |
| SGND (Pin 4) | Signal ground | Reference for feedback, error amplifier, and control logic - must be isolated from PGND to avoid noise coupling |
| VFB (Pin 5) | Feedback input | Senses output via resistor divider; 0.9V reference sets VOUT = 0.9V × (1 + RTOP/RBOT) |
| NC (Pins 6,7) | No connection | Unbonded die pads - must remain unconnected on PCB |
| PG (Pin 8) | Power-good indicator | Open-drain output asserting after 10 ms delay when VOUT exceeds 93% target - used for system sequencing |
| EN (Pin 9) | Enable input | Logic-high (>2.2V) enables regulator; internally pulled up to 4.2V - pull low to enter 5 µA shutdown |
| BOOST (Pin 10) | Bootstrap supply | Drives high-side gate; requires 22 nF ceramic cap between BOOST and SW for reliable NMOS turn-on |
| PGND (Pins 14,15) | Power ground | Return path for low-side MOSFET and SW node - separate from SGND to minimize switching noise injection |
| EP (Pin 17) | Exposed thermal pad | Thermal interface to PCB GND plane - mandatory for thermal dissipation and junction temp control |
Key Features
| Feature | Design Value |
|---|---|
| Integrated high- and low-side N-MOSFETs | Eliminates external power switches and gate drivers, reducing BOM count and layout complexity |
| Internal compensation network | Enables stable operation with no external compensation components required for standard 4.7 µH / 22 µF designs |
| Power-good (PG) open-drain output | Provides system-level power sequencing and fault indication without additional supervisor ICs |
| 1 MHz fixed-frequency PWM with PFM mode | Optimizes efficiency across full load range: high-frequency operation minimizes passive size; PFM extends light-load runtime |
| Thermal shutdown with hysteresis | Shuts down at 170°C and resumes at 160°C - protects against sustained overload or poor heatsinking |
| Soft-start with controlled reference ramp | Prevents output overshoot and inrush current during startup, eliminating need for external soft-start circuitry |
Applications
| PIC®/dsPIC® Microcontroller Bias Supply | 12V Industrial Input DC-DC Conversion |
|---|---|
Use Scenario: Powering 3.3V or 1.8V cores and I/O of Microchip PIC®/dsPIC® MCUs in embedded control systems. IC Role / Device Role / Timing Role: Primary buck regulator providing tightly regulated, low-noise VDD for digital and analog subsystems. Use Value: ±1.5% reference accuracy and internal soft-start ensure reliable MCU boot-up and eliminate reset glitches during power transitions. | Use Scenario: Converting unregulated 12V rail (e.g., from industrial SMPS or battery) to 5V/3.3V for sensors, PLC I/O, or HMI modules. IC Role / Device Role / Timing Role: High-efficiency, thermally robust step-down converter operating across wide ambient temperatures (-40°C to +125°C). Use Value: 95% typical efficiency and 170°C thermal shutdown enable continuous operation in enclosed enclosures without forced air cooling. |
| SLA Battery Powered Devices | Wall Cube Regulation |
Use Scenario: Regulating output from sealed lead-acid (SLA) batteries (12V–14.4V nominal) to stable 3.3V for telemetry or monitoring electronics. IC Role / Device Role / Timing Role: Input-wide buck converter maintaining regulation as battery discharges below 12V down to 6V UVLO threshold. Use Value: 5 µA shutdown current extends standby life; UVLO hysteresis prevents oscillation during gradual battery sag. | Use Scenario: Secondary-side regulation in AC-DC wall adapters supplying 5V USB ports or low-power consumer devices. IC Role / Device Role / Timing Role: Post-regulator improving transient response and output accuracy beyond primary-side controller tolerance. Use Value: Adjustable output and ±1.5% reference allow precise compliance with USB spec; PG pin enables adapter status reporting. |
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 6–24V input, but fixed 3.3V output; 1A rating; QFN-10 package; no PG pin | Lacks adjustability and power-good reporting - suitable only where fixed 3.3V and simpler sequencing suffice | Select when board space is constrained and output voltage is invariant; verify absence of PG does not impact system startup sequence |
| MIC24046YMT-TZ | Higher 3A output; 4.5–36V input; 2.5% VOUT accuracy; no internal compensation; requires external loop compensation | Supports higher current and wider VIN but increases design complexity and component count | Choose for >1A loads or extended input range; accept added compensation design effort and larger solution size |
Compared with MCP16321T-ADJE/NG, MCP16311T-E/MS trades adjustability and PG for smaller footprint and lower cost, while MIC24046YMT-TZ offers higher current and input range at the expense of external compensation and reduced integration.
Availability
MCP16321T-ADJE/NG is available at Aetrix Electronics and suitable for PIC®/dsPIC® microcontroller bias supplies, 12V industrial DC-DC conversion, and SLA battery-powered telemetry systems requiring stable component supply and long-term manufacturability support.
Supply support for MCP16321T-ADJE/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, and mixed-signal ICs, with deep expertise in power management and embedded control solutions.
The MCP16321/2 product line was designed for high-efficiency, space-constrained synchronous buck conversion in industrial, automotive, and consumer applications where input voltage ranges exceed 12V and adjustable output is required.
FAQ
What is the maximum input voltage the MCP16321T-ADJE/NG can handle?
The MCP16321T-ADJE/NG supports an absolute maximum input voltage of 26.4V, with recommended continuous operation up to 24V. Its undervoltage lockout activates at 5.75V (typical), and it maintains regulation across the full 6.0V–24V input range. Exceeding 24V risks violating the 26.4V absolute maximum rating and may cause permanent damage.
Does the MCP16321T-ADJE/NG require external compensation components?
No, the MCP16321T-ADJE/NG features internal compensation optimized for standard 4.7 µH inductors and 22 µF ceramic output capacitors. This eliminates the need for external compensation networks in most designs, simplifying layout and reducing BOM count while maintaining stability across temperature and load.
How does the power-good (PG) pin function on the MCP16321T-ADJE/NG?
The PG pin on the MCP16321T-ADJE/NG is an open-drain output that remains low until VOUT rises above 93% of its target value, then asserts high after a 10 ms internal delay. It must be pulled up externally to ≤6V and signals system readiness for downstream logic - critical for safe MCU or FPGA power sequencing.
What is the purpose of the BOOST pin on the MCP16321T-ADJE/NG?
The BOOST pin on the MCP16321T-ADJE/NG provides gate drive voltage for the internal high-side N-MOSFET. A 22 nF ceramic capacitor between BOOST and SW supplies the floating voltage needed to fully enhance the high-side switch. The device automatically refreshes this charge every eight cycles if duty cycle approaches 100%.
Can the MCP16321T-ADJE/NG operate with ceramic output capacitors?
Yes, the MCP16321T-ADJE/NG is explicitly designed to be stable with low-ESR ceramic output capacitors - typically two 22 µF X5R/X7R devices. Its internal compensation and peak current mode control eliminate the need for electrolytic or tantalum capacitors, enabling smaller, more reliable, and temperature-stable power solutions.
MCP16321T-ADJE/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:
- Adjustable
- Number of Outputs:
- 1
- Voltage - Input (Min):
- 6V
- Voltage - Input (Max):
- 24V
- Voltage - Output (Min/Fixed):
- 0.9V
- Voltage - Output (Max):
- 5V
- 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-ADJE/NG FAQ
1.How can I place an order for MCP16321T-ADJE/NG through Aetrix?
Please submit a Request for Quotation (RFQ) for MCP16321T-ADJE/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-ADJE/NG reliable?
The price and inventory of MCP16321T-ADJE/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-ADJE/NG is usually 5 days.
3.What payment methods are accepted for MCP16321T-ADJE/NG?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MCP16321T-ADJE/NG transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MCP16321T-ADJE/NG?
MCP16321T-ADJE/NG orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MCP16321T-ADJE/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-ADJE/NG?
For technical support, including MCP16321T-ADJE/NG datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MCP16321T-ADJE/NG requirements.
6.How does Aetrix verify that MCP16321T-ADJE/NG is sourced from the original manufacturer or authorized distributors?
All MCP16321T-ADJE/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-ADJE/NG meets industry standards.
7.What is the process for return or replacement of MCP16321T-ADJE/NG?
All MCP16321T-ADJE/NG units undergo pre-shipment inspection (PSI). If there is an issue with MCP16321T-ADJE/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-ADJE/NG part is unused and in its original packaging.
Return procedure for MCP16321T-ADJE/NG:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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