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Microchip Technology MCP16311T-E/MS
- Part No.:
- MCP16311T-E/MS
- Manufacturer:
- Microchip Technology
- Package:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Datasheet:
-
MCP16311T-E/MS.pdf
- Description:
- IC REG BUCK ADJ 1A 8MSOP
- Quantity:
- Payment:
- Shipping:
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Product details
Overview
MCP16311T-E/MS from Microchip Technology is a synchronous step-down DC-DC converter IC with integrated high-side (300 mΩ) and low-side (170 mΩ) N-channel MOSFETs, 500 kHz fixed-frequency peak current mode control, 0.8 V reference voltage, and AEC-Q100 Grade 1 qualification (–40°C to +125°C). It delivers up to 1 A continuous output current across 2.0 V to 12 V output range from 4.4 V to 30 V input, targeting automotive battery regulation and industrial point-of-load conversion.
For engineers reviewing the MCP16311T-E/MS datasheet, MCP16311T-E/MS pinout, MCP16311T-E/MS application, or MCP16311T-E/MS equivalent, this page provides verified technical context, validated pin functions, confirmed thermal shutdown behavior (+150°C), exact PFM/PWM mode operation logic, and real-world efficiency curves across VIN and IOUT - all specific to the MSOP-8 package variant with exposed pad (EP).
Technical Context
The MCP16311T-E/MS implements fixed-frequency (425–575 kHz) peak current mode control with internal slope compensation, enabling fast transient response and stable regulation under input voltage steps and load transients. Its dual-mode operation-automatic PFM at light loads (44 µA quiescent current) and forced PWM at heavier loads-optimizes efficiency across 1 mA to 1 A output range without external mode selection.
It integrates an internal 5.0 V LDO bias regulator (VCC), undervoltage lockout (4.1 V start / 3.6 V stop), cycle-by-cycle current limiting (1.8 A), and thermal shutdown with 25°C hysteresis. The BOOST–SW bootstrap circuit enables high-side gate drive, while separate AGND and PGND pins minimize noise coupling between analog control and power switching paths.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 4.4 V to 30 V - supports direct connection to 24 V industrial rails and automotive batteries without pre-regulation. |
| Output Current | 1 A continuous - sufficient for PIC®/dsPIC® microcontroller bias supplies and local FPGA core rails. |
| Switching Frequency | 500 kHz typical - enables compact magnetics (e.g., 15–22 µH inductors) and predictable EMI filtering design. |
| Feedback Reference | 0.800 V ±1.6% - sets output voltage via external resistor divider; enables precise 3.3 V, 5.0 V, or 12 V regulation. |
| Quiescent Current | 44 µA in non-switching PFM mode - extends battery life in always-on automotive modules. |
| Thermal Shutdown | +150°C with +25°C hysteresis - protects against sustained overload or poor PCB thermal design. |
| UVLO Threshold | 4.1 V (start), 3.6 V (stop) - prevents erratic startup during cold-cranking or brownout conditions. |
| Efficiency | Up to 95% - achieved via integrated 300 mΩ high-side and 170 mΩ low-side MOSFETs minimizing conduction loss. |
Pinout & Package
Package: 8-pin MSOP with exposed thermal pad (EP), RoHS-compliant, moisture sensitivity level 1. Thermal resistance θJA = 211°C/W (JEDEC standard); EP internally connected to PGND and AGND for low-impedance heat dissipation and ground integrity.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VFB | Feedback input | Connects to resistor divider; regulates output by comparing against 0.8 V internal reference - determines final VOUT accuracy and loop stability. |
| VCC | Internal bias regulator output | Supplies 5.0 V to gate drivers and control circuits; requires 1 µF X7R ceramic capacitor to AGND for transient current delivery. |
| EN | Enable logic input | Logic-high (>1.85 V) enables regulation; logic-low (<0.4 V) disables switching and reduces input current to 3 µA typical. |
| VIN | Main power input | Accepts 4.4–30 V; must be decoupled with ≥4.7 µF ceramic capacitor near pin to suppress switch-node noise and supply peak gate currents. |
| PGND | Power ground return | Low-impedance return path for high di/dt currents from SW and BOOST; must be routed short and wide, joined to AGND at single point. |
| SW | Switch node | Connects to inductor and BOOST capacitor; swings from near 0 V to VIN during operation - critical for EMI layout and snubber placement. |
| BOOST | High-side gate drive supply | Forms floating supply with SW via external 100 nF capacitor; enables full enhancement of integrated 300 mΩ high-side MOSFET. |
| AGND | Analog ground reference | Reference for error amplifier, UVLO, and thermal sensors; must be isolated from noisy PGND traces except at star point. |
| EP | Exposed thermal pad | Internally tied to PGND and AGND; soldered to PCB copper pour for thermal relief and EMI reduction - mandatory for rated 1 A operation. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated synchronous switches | 300 mΩ high-side + 170 mΩ low-side N-MOSFETs eliminate external FETs and drivers - reduces BOM count and layout area. |
| Automatic PFM/PWM mode selection | Switches to PFM below ~25–150 mA (VIN-dependent) to maintain >85% efficiency at light loads - no external control required. |
| Internal compensation | Full error amplifier + slope compensation integrated - eliminates external compensation network and simplifies design validation. |
| Soft-start time | 300 µs (EN low-to-high) - limits inrush current into output capacitors and prevents overshoot during power-up sequences. |
| AEC-Q100 Grade 1 qualification | Validated for –40°C to +125°C junction operation - suitable for under-hood automotive applications without derating. |
| Peak current limit | 1.8 A cycle-by-cycle - protects against short-circuit and overload without external current-sense resistors or protection ICs. |
Applications
| Automotive Battery Regulation | PIC®/dsPIC® Microcontroller Bias Supply |
|---|---|
Use Scenario: Regulating 12 V or 24 V vehicle battery to stable 3.3 V or 5.0 V for engine control units (ECUs) and body electronics. IC Role / Device Role / Timing Role: Primary buck regulator delivering clean, regulated power to MCU cores and peripherals under cold-crank and load-dump conditions. Use Value: AEC-Q100 Grade 1 rating ensures reliable operation at +125°C ambient; UVLO hysteresis prevents cycling during battery sag. |
Use Scenario: Providing tightly regulated 3.3 V bias to PIC® or dsPIC® microcontrollers in industrial HMI panels and motor drives. IC Role / Device Role / Timing Role: Local point-of-load (POL) regulator placed near MCU VDD pins to minimize IR drop and noise coupling. Use Value: 1 A capability supports full-speed operation with peripherals active; 0.8 V reference enables accurate 3.3 V output with ±1% tolerance. |
| 24 V Industrial Input DC-DC Conversion | Networking Systems Power Management |
Use Scenario: Converting unregulated 24 V factory floor supply to 5.0 V or 12 V for PLC I/O modules and sensor interfaces. IC Role / Device Role / Timing Role: Main DC-DC stage converting wide-input industrial rail to intermediate bus voltages with high efficiency and low standby loss. Use Value: 95% peak efficiency reduces thermal load in sealed enclosures; 4.4 V minimum VIN supports brownout resilience. |
Use Scenario: Generating 5.0 V or 3.3 V for Ethernet PHYs, switch controllers, and management ASICs in enterprise routers and switches. IC Role / Device Role / Timing Role: Secondary regulator downstream of AC-DC front-end, providing low-noise, fast-transient power for communication ICs. Use Value: PFM/PWM auto-switching maintains >88% efficiency from 10 mA to 1 A - ideal for bursty data traffic loads. |
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-E/MS | PWM-only operation (no PFM); higher quiescent current (3.8 mA vs. 44 µA) at light loads; identical pinout and package. | Better suited for noise-sensitive applications requiring constant 500 kHz frequency and lower output ripple. | Select MCP16312T-E/MS when EMI filtering predictability outweighs light-load efficiency - e.g., in RF subsystems or audio codecs. |
| LM2678SD-5.0/NOPB | Fixed 5.0 V output (non-adjustable); external high-side switch only; 63% max efficiency at 1 A; no AEC-Q100 qualification. | Limited to fixed-output, non-automotive designs where cost is prioritized over thermal performance and regulation flexibility. | Choose LM2678SD-5.0/NOPB only for legacy 5 V-only systems with relaxed efficiency and qualification requirements. |
Compared with MCP16312T-E/MS, the MCP16311T-E/MS trades constant-frequency EMI for superior light-load efficiency; compared with LM2678SD-5.0/NOPB, it adds adjustability, integrated switches, AEC-Q100 compliance, and 32 percentage points higher peak efficiency - making it the preferred choice for modern automotive and industrial POL designs.
Availability
MCP16311T-E/MS is available at Aetrix Electronics and suitable for automotive battery regulation, PIC®/dsPIC® microcontroller bias supply, and 24 V industrial input DC-DC conversion requiring stable component supply, long-term lifecycle support, and AEC-Q100-compliant sourcing.
Supply support for MCP16311T-E/MS 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, serving automotive, industrial, and consumer markets with vertically integrated silicon and software solutions.
The MCP16311/2 product line was designed specifically for high-efficiency, integrated synchronous buck conversion in space-constrained, thermally demanding environments - emphasizing AEC-Q100 qualification, internal compensation, and automatic PFM/PWM mode optimization.
FAQ
What is the maximum output voltage supported by the MCP16311T-E/MS?
The MCP16311T-E/MS supports an output voltage range of 2.0 V to 12 V when VIN > VOUT. While the datasheet notes a theoretical 2.0 V to 24 V adjustment range, output currents above 1 A are not guaranteed beyond 12 V due to duty cycle and thermal limitations - confirmed in DS20005255C-page 3, Note 2. For 24 V outputs, derating to <1 A is required.
Does the MCP16311T-E/MS require external compensation components?
No, the MCP16311T-E/MS features fully internal compensation including error amplifier and slope compensation circuitry - eliminating the need for external RC networks. This is explicitly stated in the General Description (DS20005255C-page 1) and Section 4.1.5, reducing design complexity and board area while ensuring stability across its full operating range.
How does the PFM/PWM mode transition work in the MCP16311T-E/MS?
The MCP16311T-E/MS automatically transitions from PWM to PFM mode based on load current, input voltage, and output voltage - per Figure 2-17. At light loads (e.g., <50 mA at VIN = 12 V), it enters PFM sleep cycles with 44 µA quiescent current, waking periodically to correct output droop. No external signal or configuration is needed - the behavior is fully autonomous and built into the control logic.
Is the exposed thermal pad (EP) of the MCP16311T-E/MS electrically connected?
Yes, the exposed thermal pad (EP) has an internal electrical connection to both PGND and AGND pins, as confirmed in Table 3-1 and Section 3.9 of DS20005255C. It must be soldered to a PCB thermal pad tied to system ground - not left floating - to ensure proper thermal dissipation and noise immunity.
What is the recommended input capacitor for the MCP16311T-E/MS?
The datasheet specifies a minimum 4.7 µF–20 µF X7R/X5R ceramic capacitor placed as close as possible to the VIN and PGND pins (Section 3.4). For 1 A operation with 12 V input, two parallel 10 µF capacitors are used in the Typical Application schematic (DS20005255C-page 2), ensuring low ESR and effective high-frequency noise suppression at the switch node.
MCP16311T-E/MS Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- -
- Package/Case:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Function:
- Step-Down
- Output Configuration:
- Positive
- Topology:
- Buck
- Output Type:
- Adjustable
- Number of Outputs:
- 1
- Voltage - Input (Min):
- 4.4V
- Voltage - Input (Max):
- 30V
- Voltage - Output (Min/Fixed):
- 2V
- Voltage - Output (Max):
- 24V
- Current - Output:
- 1A
- Frequency - Switching:
- 500kHz
- Synchronous Rectifier:
- Yes
- Operating Temperature:
- -40°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-MSOP
MCP16311T-E/MS FAQ
1.How can I place an order for MCP16311T-E/MS through Aetrix?
Please submit a Request for Quotation (RFQ) for MCP16311T-E/MS 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 MCP16311T-E/MS reliable?
The price and inventory of MCP16311T-E/MS are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MCP16311T-E/MS is usually 5 days.
3.What payment methods are accepted for MCP16311T-E/MS?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MCP16311T-E/MS transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MCP16311T-E/MS?
MCP16311T-E/MS orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MCP16311T-E/MS 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 MCP16311T-E/MS?
For technical support, including MCP16311T-E/MS datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MCP16311T-E/MS requirements.
6.How does Aetrix verify that MCP16311T-E/MS is sourced from the original manufacturer or authorized distributors?
All MCP16311T-E/MS 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 MCP16311T-E/MS meets industry standards.
7.What is the process for return or replacement of MCP16311T-E/MS?
All MCP16311T-E/MS units undergo pre-shipment inspection (PSI). If there is an issue with MCP16311T-E/MS, 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 MCP16311T-E/MS part is unused and in its original packaging.
Return procedure for MCP16311T-E/MS:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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