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Microchip Technology MCP16322T-330E/NG
- Part No.:
- MCP16322T-330E/NG
- Manufacturer:
- Microchip Technology
- Package:
- 16-VFQFN Exposed Pad
- Datasheet:
-
MCP16322T-330E/NG.pdf
- Description:
- IC REG BUCK 3.3V 2A 16QFN
- Quantity:
- Payment:
- Shipping:
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Product details
Overview
MCP16322T-330E/NG from Microchip Technology is a synchronous step-down DC-DC converter IC delivering up to 2A continuous output current at a fixed 3.3V with ±2% accuracy, operating from 6.0V–24V input, featuring integrated 180 mΩ high-side and 120 mΩ low-side N-channel MOSFETs, 1 MHz fixed-frequency peak current mode control, and power-good indication - deployed in industrial 12V DC-DC conversion and PIC® microcontroller bias supplies.
For engineers reviewing the MCP16322T-330E/NG datasheet, MCP16322T-330E/NG pinout, MCP16322T-330E/NG application, or MCP16322T-330E/NG equivalent, key selection criteria include input voltage range (6–24V), 3.3V fixed output tolerance (±2%), thermal shutdown threshold (170°C), PG open-drain reporting, and QFN-16 (3×3 mm) package compatibility with ceramic output capacitors.
Technical Context
The MCP16322T-330E/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 amplification, soft-start ramp generation, and VFB comparator with 1.5% reference accuracy for adjustable variants - though this part uses factory-trimmed 3.3V regulation.
It employs synchronous rectification via dual integrated N-MOSFETs (180 mΩ HS / 120 mΩ LS), bootstrap gate drive for the high-side switch replenished every 8 cycles (240 ns off-time), and dedicated SGND/PGND separation to minimize noise coupling into the feedback path. Protection includes UVLO (5.5–6.0V start, 0.65V hysteresis), overtemperature shutdown (170°C, 10°C hysteresis), and VOUT overvoltage lockout (103% VOUT).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 3.3V ±2% over -40°C to +125°C junction temperature - ensures stable logic-level rail for MCU I/O and peripherals without external resistor divider. |
| Max Output Current | 2A continuous - supports high-current digital loads like DSPs or multi-rail PMICs without external current boosting. |
| Input Voltage Range | 6.0V to 24V - accommodates wide industrial input sources including 12V nominal battery/supply rails with transient headroom. |
| Switching Frequency | 1 MHz (0.9–1.1 MHz) - enables compact 4.7 µH inductor and low-ESR ceramic output capacitors (2×22 µF typical). |
| Efficiency | Up to 95% typical at 3.3V/1A, VIN=12V - minimizes thermal load in enclosed industrial enclosures and extends SLA battery runtime. |
| Thermal Shutdown | 170°C die temperature with 10°C hysteresis - provides robust fault recovery without latch-up during sustained overload or poor PCB heatsinking. |
| Power Good (PG) | Open-drain active-low with 10 ms release timer and 93% VOUT undervoltage threshold - enables safe system power sequencing and brown-out detection. |
Pinout & Package
Package: 16-pin QFN (3 mm × 3 mm, 0.5 mm pitch) with exposed thermal pad (EP) requiring PCB GND connection per Microchip layout guidelines.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 12, 13, 16 SW | Switch node | Common drain-source connection point for internal HS/LS MOSFETs; must connect directly to inductor and BOOST capacitor with short, wide trace to minimize ringing. |
| 2, 3, 11 VIN | Input supply | Dual-purpose power and bias rail; requires local 2×10 µF ceramic decoupling close to pins to support high di/dt switching current. |
| 4 SGND | Signal ground | Analog reference and control-loop ground; must be isolated from noisy PGND except at single-point PCB star ground. |
| 5 VFB | Feedback input | Internally tied to 3.3V reference for fixed-output version; unused externally - leave unconnected or tie to VOUT only if verifying regulation. |
| 6, 7 NC | No connection | Unbonded die pads; must remain floating - no PCB trace or solder mask opening required. |
| 8 PG | Power good indicator | Open-drain output pulled up externally to ≤6V; asserts low until VOUT reaches 93% of 3.3V and holds for 10 ms before releasing high. |
| 9 EN | Enable input | Logic-compatible enable (VIH ≥2.2V, VIL ≤0.8V); internally pulled up to 4.2V - pull low to reduce shutdown current to 5–10 µA. |
| 10 BOOST | Bootstrap supply | Drives HS gate; requires 22 nF ceramic capacitor between BOOST and SW - recharged automatically every 8 cycles to sustain 100% duty capability. |
| 14, 15 PGND | Power ground | Low-side MOSFET source return; carries high di/dt switching current - route separately from SGND and tie to EP/GND plane under device. |
| 17 EP | Exposed thermal pad | Electrically isolated copper pad; must be soldered to solid GND plane for thermal conduction - contributes significantly to θJA = 38.5°C/W. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated synchronous power stage | 180 mΩ high-side + 120 mΩ low-side N-MOSFETs eliminate external FETs and drivers - reduces BOM count and layout complexity for 2A buck designs. |
| Internal compensation | Full Type II error amplifier and slope compensation embedded - eliminates external compensation network, enabling stable operation with ceramic output caps. |
| Power Good (PG) with timing | 10 ms release delay after VOUT exceeds 93% of 3.3V - prevents false system wake-up during soft-start or line transients. |
| Peak current mode control | Fast transient response with inherent cycle-by-cycle current limiting - maintains regulation during 100 mA → 2A load steps without external current sense resistors. |
| UVLO with hysteresis | 5.75V turn-on with 0.65V hysteresis - avoids oscillatory startup when powered from weak or loaded 6V sources. |
Applications
| PIC®/dsPIC® Microcontroller Bias Supply | 12V Industrial Input DC-DC Conversion |
|---|---|
Use Scenario: Providing clean, regulated 3.3V power to PIC32MX or dsPIC33EP microcontrollers in programmable logic controllers (PLCs) with 12V backplane input. IC Role / Device Role / Timing Role: Primary step-down regulator supplying core and I/O voltage rails; PG signal synchronizes firmware initialization after power stabilization. Use Value: Delivers 2A peak current for USB host peripherals and Ethernet PHYs while maintaining <1% output deviation across -40°C to +85°C ambient. |
Use Scenario: Converting unregulated 12V industrial bus to 3.3V for FPGA configuration, sensor interfaces, and real-time clock backup in factory automation equipment. IC Role / Device Role / Timing Role: Main DC-DC converter with thermal foldback and PG sequencing - replaces discrete buck controllers in space-constrained DIN-rail mounted modules. Use Value: Achieves >92% efficiency at full 2A load with minimal heatsink requirement, reducing enclosure temperature rise by 8°C vs. legacy solutions. |
| DSL Cable Modem Power Management | SLA Battery Powered Devices |
Use Scenario: Generating 3.3V for ADSL2+ line driver ICs and packet processors in residential broadband gateways with 12V wall adapter input. IC Role / Device Role / Timing Role: High-efficiency intermediate rail generator; EN pin enables dynamic power gating during sleep modes to extend standby time. Use Value: Quiescent current of 2.3 mA (non-switching) and 5 µA (shutdown) cuts system idle power by 65% compared to LDO-based alternatives. |
Use Scenario: Powering portable medical monitors and handheld test instruments powered by sealed lead-acid (SLA) batteries (12V nominal, 10–14.4V range). IC Role / Device Role / Timing Role: Wide-input buck regulator supporting full battery discharge curve; UVLO prevents deep discharge below 5.75V cutoff. Use Value: Maintains 3.3V regulation down to 6V input with <2% ripple, extending usable battery runtime by 22% versus non-synchronous converters. |
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-330E/NG | Same 3.3V fixed output, but rated for 3A max output current and higher 30V absolute max VIN; includes enhanced light-load PFM mode. | Better suited for future-proofing or higher transient current demands; requires larger inductor (≥6.8 µH) due to lower switching frequency (500 kHz). | Select when >2A peak load margin or extended input voltage headroom (up to 30V) is required - not drop-in due to different thermal pad layout and EN threshold. |
| MIC24046-3.3YSME | 3.3V fixed output, 2A rating, 2.2–18V input range; uses valley current mode control and lacks PG pin - no power sequencing capability. | Targeted at cost-sensitive consumer applications; missing UVLO hysteresis and overvoltage protection - requires external supervision circuitry for industrial use. | Choose only for non-critical 12V systems where PG signaling and robust protection are unnecessary; incompatible pinout and footprint. |
Compared with MCP16322T-330E/NG, the MCP16312T-330E/NG offers higher current headroom and wider input range but sacrifices 1 MHz switching speed and adds layout complexity, while the MIC24046-3.3YSME omits critical safety features and cannot substitute in systems requiring PG-driven sequencing or industrial-grade fault coverage.
Availability
MCP16322T-330E/NG is available at Aetrix Electronics and suitable for industrial embedded systems, automotive body electronics, and medical instrumentation requiring stable component supply with long-term lifecycle assurance.
Supply support for MCP16322T-330E/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 U.S.-based semiconductor manufacturer specializing in microcontrollers, analog devices, and power management ICs, with global design centers and ISO 9001-certified manufacturing.
The MCP1632x family was designed specifically for high-efficiency, wide-input synchronous buck conversion in space-constrained industrial and embedded applications - emphasizing integration, thermal robustness, and ease of qualification.
FAQ
What is the maximum input voltage rating for the MCP16322T-330E/NG?
The MCP16322T-330E/NG has an absolute maximum input voltage rating of 26.4V, with recommended continuous operation from 6.0V to 24V. Operation above 24V risks exceeding internal MOSFET breakdown limits and may trigger overvoltage protection on the SW node. The UVLO circuit disables operation below 5.5V (min), ensuring reliable startup only within the specified 6–24V functional range.
Does the MCP16322T-330E/NG require external compensation components?
No, the MCP16322T-330E/NG includes fully integrated internal compensation for its peak current mode control loop. This eliminates the need for external Type II or III compensation networks, allowing stable operation with standard ceramic output capacitors (e.g., 2×22 µF) and a 4.7 µH inductor - verified across -40°C to +125°C and full load range.
How does the Power Good (PG) pin function on the MCP16322T-330E/NG?
The PG pin on the MCP16322T-330E/NG is an open-drain output that remains low until VOUT rises above 93% of 3.3V (≈3.07V), then initiates a 10 ms internal timer before releasing high. It must be pulled up externally to ≤6V. This behavior enables precise power sequencing in multi-rail systems and confirms regulation before enabling downstream logic - a feature absent in many competing 2A buck regulators.
Can the MCP16322T-330E/NG operate with input voltages below 6V?
No - the MCP16322T-330E/NG incorporates an undervoltage lockout (UVLO) with a typical turn-on threshold of 5.75V and hysteresis of 0.65V. Below 5.5V (minimum), the device remains disabled and draws only 5–10 µA in shutdown. Attempting to operate below 6V violates the specified input range and will prevent regulation; it is not designed for 5V or 3.3V input applications.
What thermal management considerations apply to the MCP16322T-330E/NG in a 2A application?
At 2A output with 12V input and 3.3V output, the MCP16322T-330E/NG dissipates ~1.5W. Its QFN-16 (3×3 mm) package relies on the exposed thermal pad (EP) soldered to a minimum 13.5 in² internal GND plane for θJA = 38.5°C/W. Without proper EP grounding and copper area, junction temperature can exceed 125°C derating limits - thermal shutdown triggers at 170°C with 10°C hysteresis.
MCP16322T-330E/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):
- 3.3V
- 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-330E/NG FAQ
1.How can I place an order for MCP16322T-330E/NG through Aetrix?
Please submit a Request for Quotation (RFQ) for MCP16322T-330E/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-330E/NG reliable?
The price and inventory of MCP16322T-330E/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-330E/NG is usually 5 days.
3.What payment methods are accepted for MCP16322T-330E/NG?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MCP16322T-330E/NG transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MCP16322T-330E/NG?
MCP16322T-330E/NG orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MCP16322T-330E/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-330E/NG?
For technical support, including MCP16322T-330E/NG datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MCP16322T-330E/NG requirements.
6.How does Aetrix verify that MCP16322T-330E/NG is sourced from the original manufacturer or authorized distributors?
All MCP16322T-330E/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-330E/NG meets industry standards.
7.What is the process for return or replacement of MCP16322T-330E/NG?
All MCP16322T-330E/NG units undergo pre-shipment inspection (PSI). If there is an issue with MCP16322T-330E/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-330E/NG part is unused and in its original packaging.
Return procedure for MCP16322T-330E/NG:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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