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Microchip Technology MCP16321T-150E/NG
- Part No.:
- MCP16321T-150E/NG
- Manufacturer:
- Microchip Technology
- Package:
- 16-VFQFN Exposed Pad
- Datasheet:
-
MCP16321T-150E/NG.pdf
- Description:
- IC REG BUCK 1.5V 1A 16QFN
- Quantity:
- Payment:
- Shipping:
Inventory:3,231
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Product details
Overview
MCP16321T-150E/NG from Microchip Technology is a synchronous step-down DC-DC converter IC delivering 1A continuous output at fixed 1.5V 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. It serves as a compact, high-efficiency bias supply for PIC®/dsPIC® microcontrollers in industrial and automotive power systems.
For engineers reviewing the MCP16321T-150E/NG datasheet, MCP16321T-150E/NG pinout, MCP16321T-150E/NG application, or MCP16321T-150E/NG equivalent, key selection criteria include input voltage range (6–24V), fixed 1.5V output tolerance, thermal shutdown behavior, PG timing delay, and QFN-16 layout compatibility with exposed pad grounding.
Technical Context
The MCP16321T-150E/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 control loop integrates error amplifier, soft-start ramp generator, and overvoltage/undervoltage comparators tied to the VFB pin.
It uses a bootstrap gate drive scheme where the BOOST capacitor-charged during low-side conduction-is replenished every eighth switching cycle via a forced 240 ns off-time to sustain high-side N-MOSFET operation under high-duty-ratio conditions (e.g., 1.5V out from 6V in).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 1.5V ±2% over -40°C to +125°C junction temperature |
| Input Voltage Range | 6.0V to 24V - supports 12V industrial rails and 24V automotive battery inputs |
| Continuous Output Current | 1A - sufficient for single-core MCU core logic or I/O rail regulation |
| Switching Frequency | 1 MHz ±10% - enables use of small 4.7 µH inductors and ceramic output capacitors |
| High-Side RDS(ON) | 180 mΩ max - limits conduction loss to ≤270 mW at 1A, reducing thermal load |
| Low-Side RDS(ON) | 120 mΩ max - minimizes freewheeling loss and improves light-load efficiency |
| UVLO Threshold | 5.75V typical start-up with 0.65V hysteresis - prevents erratic startup near brownout conditions |
| Power Good Delay | 10 ms release timer after VOUT exceeds 93% of 1.5V - ensures stable MCU reset sequencing |
Pinout & Package
Package: 3×3 mm QFN-16 with exposed thermal pad (EP), RoHS-compliant, moisture-sensitive level 3.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 12, 13, 16 SW | Switch node connection | Drain of low-side MOSFET and source of high-side MOSFET; connects directly to inductor and BOOST capacitor - requires short, wide PCB trace for EMI and thermal performance |
| 2, 3, 11 VIN | Main power input | Supplies both power stage and internal bias circuitry; requires local 2×10 µF ceramic decoupling close to pins |
| 4 SGND | Analog reference ground | Reference for VFB, EN, PG, oscillator, and control loop - must be isolated from noisy PGND |
| 5 VFB | Feedback input | Monitors regulated 1.5V output directly (fixed version); open-drain comparator input with 100 nA bias current |
| 6, 7 NC | No connection | Not internally bonded - must remain unconnected on PCB |
| 8 PG | Power-good indicator | Open-drain active-low output; pulled up externally to ≤6V; asserts high after 10 ms once VOUT ≥ 1.40V |
| 9 EN | Enable control | Logic-level input (VIH ≥ 2.2V, VIL ≤ 0.8V); internally pulled up to 4.2V - pull low to disable, drawing only 5–10 µA |
| 10 BOOST | Bootstrap voltage supply | Drives high-side gate; requires 22 nF ceramic cap between BOOST and SW - recharged every 8th cycle |
| 14, 15 PGND | Power ground | Return path for low-side MOSFET and internal switch driver - separate from SGND to reduce noise coupling |
| 17 EP | Exposed thermal pad | Electrically isolated copper pad; must be soldered to solid GND plane for thermal dissipation (θJA = 38.5°C/W) |
Key Features
| Feature | Design Value |
|---|---|
| Integrated synchronous power stage | Eliminates external MOSFETs and drivers - reduces BOM count and layout area for 1A applications |
| Internal compensation network | Enables stable operation with standard 4.7 µH inductor and 2×22 µF ceramic output capacitors - no external compensation components required |
| Power-good (PG) with 10 ms delay | Provides reliable system reset signaling to MCUs or supervisors - avoids premature release during output settling |
| Thermal shutdown with 10°C hysteresis | Shuts down at 170°C die temperature and resumes at 160°C - prevents latch-up and enables self-recovery in transient overload |
| Soft-start with 4 ms ramp time | Controls output voltage rise rate to limit inrush current into downstream capacitance - prevents input rail sag and overshoot |
| Stable with ceramic output capacitors | Supports low-ESR MLCCs without requiring tantalum or electrolytic types - improves reliability and temperature stability |
Applications
| PIC®/dsPIC® Microcontroller Bias Supply | 12V Industrial Input DC-DC Conversion |
|---|---|
Use Scenario: Powering the core voltage rail of a PIC32MX-based motor controller board operating from a 12V factory bus. IC Role / Device Role / Timing Role: Primary synchronous buck regulator generating stable 1.5V core supply with tight transient response and PG signaling for safe MCU boot. Use Value: Delivers 1A at 95% peak efficiency with minimal external components, enabling compact 12V-to-1.5V conversion without heatsinking. | Use Scenario: Regulating 12V input to 1.5V for FPGA configuration memory and I/O banks in an industrial PLC module. IC Role / Device Role / Timing Role: Fixed-output DC-DC converter providing clean, low-noise 1.5V rail with UVLO and OVP protection for mission-critical logic. Use Value: Maintains ±2% output accuracy across -40°C to +125°C, ensuring reliable operation in uncontrolled cabinet environments. |
| SLA Battery Powered Devices | Wall Cube Regulation |
Use Scenario: Converting 12–14.4V from sealed lead-acid battery to 1.5V for low-power sensor interface circuitry in remote telemetry units. IC Role / Device Role / Timing Role: High-input-voltage buck regulator with 5 µA shutdown current and robust UVLO to extend battery life and prevent deep discharge. Use Value: Achieves >85% efficiency at 100 mA load and draws only 5 µA in shutdown - extends SLA runtime by >20% versus discrete solutions. | Use Scenario: Secondary-stage regulation in universal-input AC-DC wall adapters powering USB-C PD accessories requiring precise 1.5V auxiliary rails. IC Role / Device Role / Timing Role: Post-regulator improving line/load regulation and ripple rejection of primary flyback outputs. Use Value: Reduces output ripple to <15 mVpp while maintaining fast load transient response (<50 µs recovery) for sensitive analog circuits. |
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-150E/NG | Same 1.5V fixed output, but rated for 2A; higher RDS(ON) (200 mΩ HS / 140 mΩ LS); identical pinout and package | Supports higher-current loads (e.g., dual-core MCUs) without redesign; slightly lower efficiency at 1A due to higher conduction loss | Select when future-proofing for >1A or when margin is needed for aging battery inputs |
| MIC24046-1.5YMT-TZ | 1.5V fixed output, 2A rating, 2.7–24V input, 2.1 MHz switching; different pinout (QFN-16 but non-compatible SW/PGND layout); no PG pin | Lacks power-good signaling and uses higher frequency - requires smaller inductor but increases EMI filtering complexity | Choose only if PG is not required and board layout allows rework of power stage routing and filtering |
Compared with MCP16311T-150E/NG and MIC24046-1.5YMT-TZ, the MCP16321T-150E/NG offers optimal balance of 1A capability, integrated PG, and proven thermal performance in space-constrained industrial modules - making it ideal where reliability and signal integrity outweigh raw current headroom or frequency scaling.
Availability
MCP16321T-150E/NG is available at Aetrix Electronics and suitable for PIC® microcontroller bias supplies, 12V industrial DC-DC conversion, and SLA battery-powered telemetry requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for MCP16321T-150E/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 delivers highly integrated, high-efficiency synchronous buck regulators targeting cost-sensitive, space-constrained applications in industrial control, automotive subsystems, and consumer electronics where input voltages exceed 6V.
FAQ
What is the maximum input voltage supported by the MCP16321T-150E/NG?
The MCP16321T-150E/NG supports an absolute maximum input voltage of 26.4V, with operational specification from 6.0V to 24V. Its undervoltage lockout starts at 5.75V (typical), ensuring reliable startup across 12V and 24V industrial and automotive supply rails. Exceeding 24V may trigger overvoltage protection or damage the device.
Does the MCP16321T-150E/NG require external compensation components?
No, the MCP16321T-150E/NG features fully internal compensation, including error amplifier and slope compensation circuitry. It achieves stable operation with standard external components: 4.7 µH inductor, 2×10 µF input capacitors, 2×22 µF output capacitors, and 22 nF BOOST capacitor - no resistors or capacitors are needed on the COMP or FB pins.
How does the power-good (PG) pin behave during startup and fault conditions?
The PG pin is an open-drain output that remains low until VOUT reaches ≥93% of 1.5V (1.40V), then waits 10 ms before pulling high. If VOUT drops below 91% (1.37V), PG immediately goes low. During overvoltage (>1.545V) or thermal shutdown, PG asserts low within one switching cycle - providing real-time fault signaling to system supervisors.
Can the MCP16321T-150E/NG operate with a 6V input and 1.5V output?
Yes, the MCP16321T-150E/NG supports 6V input at 1.5V output with a calculated minimum duty cycle of ~25%, well above the 7% limit. Efficiency remains >88% at 1A load per Figure 2-6, and the BOOST capacitor is reliably replenished due to sufficient off-time - confirmed by the "Maximum VIN to VOUT Ratio" curve on page 11.
Is the exposed thermal pad (EP) electrically connected to PGND or SGND?
No, the exposed thermal pad (EP) has no internal electrical connection to PGND or SGND. Per DS20002285B-page 15, the EP must be externally connected to PCB ground using solder - serving solely as a thermal conduction path. Failure to connect EP to GND degrades θJA from 38.5°C/W to >60°C/W and risks thermal shutdown under full load.
MCP16321T-150E/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):
- 1.5V
- 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-150E/NG FAQ
1.How can I place an order for MCP16321T-150E/NG through Aetrix?
Please submit a Request for Quotation (RFQ) for MCP16321T-150E/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-150E/NG reliable?
The price and inventory of MCP16321T-150E/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-150E/NG is usually 5 days.
3.What payment methods are accepted for MCP16321T-150E/NG?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MCP16321T-150E/NG transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MCP16321T-150E/NG?
MCP16321T-150E/NG orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MCP16321T-150E/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-150E/NG?
For technical support, including MCP16321T-150E/NG datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MCP16321T-150E/NG requirements.
6.How does Aetrix verify that MCP16321T-150E/NG is sourced from the original manufacturer or authorized distributors?
All MCP16321T-150E/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-150E/NG meets industry standards.
7.What is the process for return or replacement of MCP16321T-150E/NG?
All MCP16321T-150E/NG units undergo pre-shipment inspection (PSI). If there is an issue with MCP16321T-150E/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-150E/NG part is unused and in its original packaging.
Return procedure for MCP16321T-150E/NG:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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