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Microchip Technology MCP16311-E/MS
- Part No.:
- MCP16311-E/MS
- Manufacturer:
- Microchip Technology
- Package:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Datasheet:
-
MCP16311-E/MS.pdf
- Description:
- IC REG BUCK ADJ 1A 8MSOP
- Quantity:
- Payment:
- Shipping:
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Product details
Overview
MCP16311-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 for automotive use. It delivers up to 1 A continuous output current across 2.0–12 V output range from 4.4–30 V input, supporting local point-of-load regulation in industrial and automotive power systems.
For engineers reviewing the MCP16311-E/MS datasheet, MCP16311-E/MS pinout, MCP16311-E/MS application, or MCP16311-E/MS equivalent, this page provides verified technical context, validated pin functions, confirmed operating modes (PWM/PFM auto-switching), exact thermal shutdown behavior (+150°C), and real-world efficiency data across load and input voltage ranges - all specific to the MSOP-8 package variant.
Technical Context
The MCP16311-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 automatically selects PWM for medium-to-heavy loads and PFM for light loads (e.g., <100 mA at 12 VIN/3.3 VOUT), reducing quiescent current to 44 µA in non-switching PFM state.
It integrates a 5.0 V internal LDO (VCC) for gate drive bias, undervoltage lockout (start: 4.1 V, stop: 3.6 V, 0.5 V hysteresis), cycle-by-cycle current limiting (1.8 A typical), and thermal shutdown with 25°C hysteresis. The device requires external boost capacitor (100 nF) between BOOST and SW pins to drive the high-side MOSFET, and uses an external resistor divider on VFB to set output voltage.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 4.4 V to 30 V - supports wide-input industrial and automotive battery rails without pre-regulation. |
| Output Current | 1 A continuous - sufficient for PIC®/dsPIC® microcontroller bias supplies and local PoL conversion. |
| Switching Frequency | 500 kHz typical (425–575 kHz) - enables compact magnetics (e.g., 15–22 µH inductors) and predictable EMI filtering. |
| Feedback Reference | 0.800 V ±1.6% - sets output voltage via external resistor divider; tight tolerance ensures ±1% output accuracy over temperature. |
| Efficiency | Up to 95% - achieved via integrated 300 mΩ high-side and 170 mΩ low-side MOSFETs, minimizing conduction losses. |
| Quiescent Current | 44 µA in PFM non-switching mode - extends battery life in always-on automotive modules. |
| Thermal Shutdown | +150°C with +25°C hysteresis - protects silicon during overload or poor PCB thermal design; resumes at +125°C. |
| AEC-Q100 Grade | Grade 1 (−40°C to +125°C junction) - qualified for under-hood automotive applications including engine control units. |
Pinout & Package
Package: 8-pin MSOP (3.0 × 4.9 mm, 0.65 mm pitch), with exposed thermal pad (EP) internally connected to PGND and AGND for enhanced thermal performance (θJA = 211°C/W).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VFB | Output voltage 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 5.0 V bias regulator output | Supplies gate drivers and analog circuitry; requires 1 µF X7R ceramic bypass capacitor close to pin to sustain peak drive current. |
| EN | Logic enable input | Active-high (VIH ≥ 1.85 V); disables switching and reduces input current to 3 µA typical - enables system-level power sequencing. |
| VIN | Main power input | Accepts 4.4–30 V; must be decoupled with 2×10 µF X7R ceramic capacitors near pin to suppress switch-node noise and supply peak currents. |
| PGND | Power ground return | Low-impedance return path for high di/dt switch currents; must be routed short and wide, joined to AGND at single point to avoid ground bounce. |
| SW | Switch node connection | Drives external inductor and boost capacitor; experiences fast dV/dt edges - requires tight layout to minimize EMI and ringing. |
| BOOST | High-side gate driver floating supply | Connected to SW via 100 nF ceramic capacitor; generates ~5 V above SW to fully enhance high-side MOSFET during conduction. |
| AGND | Analog ground reference | Reference for error amplifier, UVLO, and reference circuits; must be isolated from noisy PGND traces until single-point tie. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated synchronous switches | 300 mΩ high-side + 170 mΩ low-side N-MOSFETs eliminate need for external FETs and reduce BOM count and footprint. |
| Auto PWM/PFM mode selection | Switches to PFM below load thresholds (e.g., ~50 mA at 12 VIN/5 VOUT) - maintains >85% efficiency down to 1 mA load without manual mode control. |
| Internal compensation | Embedded error amplifier and slope compensation - eliminates external compensation network, simplifying design and improving production yield. |
| Soft-start time | 300 µs (EN low-to-high) - limits inrush current into output capacitor and prevents VOUT overshoot during power-up. |
| Undervoltage lockout | 4.1 V start / 3.6 V stop with 0.5 V hysteresis - prevents erratic startup during brown-out conditions and ensures clean enable/disable behavior. |
| Thermal protection | +150°C shutdown with +25°C hysteresis - provides robust fault recovery without latch-up; allows safe restart after cooling. |
Applications
| PIC®/dsPIC® Microcontroller Bias Supply | 24V Industrial Input DC-DC Conversion |
|---|---|
Use Scenario: Powering 3.3 V or 5 V logic rails for Microchip PIC® and dsPIC® microcontrollers in programmable logic controllers and motor drives. IC Role / Device Role / Timing Role: Primary buck regulator delivering regulated local supply; handles input transients from relay switching and ESD events. Use Value: Integrated high/low-side MOSFETs and 1 A capability eliminate external power stage components, reducing board area by >30% vs. controller+external FET solutions. |
Use Scenario: Converting unregulated 24 V factory bus to 5 V or 12 V for I/O modules, sensors, and communication interfaces. IC Role / Device Role / Timing Role: Fixed-frequency synchronous buck converter with AEC-Q100 qualification - meets industrial immunity and lifetime requirements. Use Value: 4.4–30 V input range accommodates 24 V nominal with ±20% tolerance; 95% peak efficiency minimizes heat sink requirements in enclosed enclosures. |
| Automotive Battery Regulation | Networking Systems |
Use Scenario: Regulating 12 V vehicle battery (9–16 V cold-crank range) to stable 3.3 V for infotainment MCU cores and CAN transceivers. IC Role / Device Role / Timing Role: Automotive-grade buck regulator with Grade 1 temp range and thermal hysteresis - operates reliably under hood temperatures. Use Value: UVLO hysteresis prevents cycling during cranking dips; PFM mode sustains >80% efficiency at 10 mA standby current for always-on modules. |
Use Scenario: Providing 5 V bias to Ethernet PHYs, PoE controllers, and management ASICs in enterprise switches and routers. IC Role / Device Role / Timing Role: High-efficiency local regulator with low-noise PWM operation - avoids interference with high-speed serial links (e.g., SGMII, USB 3.0). Use Value: 500 kHz switching enables small 22 µH inductors; internal VCC LDO powers gate drivers independently of input ripple - improves PSRR. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar synchronous buck regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MP2451DT-LF-Z (Monolithic Power) | 4.5–36 V input, 2 A output, 500 kHz, no PFM mode - fixed PWM only; higher max current but no light-load efficiency optimization. | Preferred where constant frequency and minimal output ripple are mandatory (e.g., RF subsystems), not where ultra-low standby power is critical. | Select MP2451DT-LF-Z when output ripple <10 mVpp is required across full load range and 2 A headroom justifies larger solution size. |
| TPS54202DRCT (Texas Instruments) | 4.5–28 V input, 2 A output, 500 kHz, Eco-mode PFM - similar auto-mode behavior but lower RDS(ON) (120/70 mΩ) and tighter VREF (0.8 V ±0.5%). | Better suited for high-precision 1.2 V or 1.8 V core rails due to tighter reference and lower dropout; lacks AEC-Q100 qualification. | Choose TPS54202DRCT for non-automotive applications requiring <±1% output accuracy at light loads and higher current margin. |
Compared with MP2451DT-LF-Z and TPS54202DRCT, the MCP16311-E/MS uniquely combines AEC-Q100 Grade 1 qualification, integrated 0.8 V reference with ±2% tolerance, and proven PFM/PWM auto-transition behavior across −40°C to +125°C - making it optimal for cost-sensitive, thermally constrained automotive and industrial PoL designs where 1 A output suffices.
Availability
MCP16311-E/MS is available at Aetrix Electronics and suitable for automotive battery regulation, 24 V industrial DC-DC conversion, and PIC®/dsPIC® microcontroller bias supply applications requiring stable component supply, long-term lifecycle support, and AEC-Q100 compliance.
Supply support for MCP16311-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 U.S.-based semiconductor company specializing in microcontrollers, analog devices, and power management ICs, with broad automotive, industrial, and consumer market presence.
The MCP16311-E/MS belongs to Microchip's high-voltage synchronous buck regulator product line, designed specifically for compact, efficient local DC-DC conversion in space-constrained automotive and industrial systems requiring AEC-Q100 qualification and wide input voltage operation.
FAQ
What is the maximum output voltage supported by the MCP16311-E/MS?
The MCP16311-E/MS supports an output voltage range of 2.0 V to 24 V. However, for outputs above 12 V, the maximum continuous output current is limited to less than 1 A due to duty cycle constraints and thermal limitations. At 24 V output, the device can deliver approximately 500 mA while maintaining regulation and thermal safety under typical PCB layout conditions.
Does the MCP16311-E/MS require an external bootstrap capacitor?
Yes, the MCP16311-E/MS requires a 100 nF ceramic capacitor connected between the BOOST and SW pins to provide the floating gate drive voltage for the high-side N-channel MOSFET. This capacitor is recharged during each low-side conduction period and is essential for proper high-side switch operation - omission will result in failure to regulate or complete loss of output.
How does the MCP16311-E/MS differ from the MCP16312-E/MS?
The MCP16311-E/MS supports automatic PWM/PFM mode switching to maximize light-load efficiency, while the MCP16312-E/MS operates in PWM-only mode at 500 kHz for lower output ripple and constant frequency. Both share identical pinout, package, and core specifications - the difference is strictly in control logic and is indicated by the part number suffix (1 = PFM-capable, 2 = PWM-only).
What is the purpose of separating AGND and PGND on the MCP16311-E/MS?
AGND serves as the quiet reference for analog circuits (error amplifier, reference, UVLO), while PGND carries high di/dt switch currents. Separating them prevents ground noise coupling into sensitive analog nodes. The MCP16311-E/MS requires these grounds to be joined at a single point - typically near the input capacitor - to maintain loop stability and avoid oscillation or regulation errors.
Can the MCP16311-E/MS operate with an input voltage below 4.4 V?
No - the absolute minimum input voltage is 4.4 V per datasheet specification. Below this, the device may fail to start due to undervoltage lockout (UVLO stop threshold is 3.6 V, but start threshold is 4.1 V typical). Attempting operation below 4.4 V risks unstable regulation, intermittent shutdown, or failure to enter soft-start, especially under load or at temperature extremes.
MCP16311-E/MS Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- -
- Package/Case:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Packaging:
- Tube
- 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
MCP16311-E/MS FAQ
1.How can I place an order for MCP16311-E/MS through Aetrix?
Please submit a Request for Quotation (RFQ) for MCP16311-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 MCP16311-E/MS reliable?
The price and inventory of MCP16311-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 MCP16311-E/MS is usually 5 days.
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Note: Certain payment methods may incur a processing fee.
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MCP16311-E/MS orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MCP16311-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 MCP16311-E/MS?
For technical support, including MCP16311-E/MS datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MCP16311-E/MS requirements.
6.How does Aetrix verify that MCP16311-E/MS is sourced from the original manufacturer or authorized distributors?
All MCP16311-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 MCP16311-E/MS meets industry standards.
7.What is the process for return or replacement of MCP16311-E/MS?
All MCP16311-E/MS units undergo pre-shipment inspection (PSI). If there is an issue with MCP16311-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 MCP16311-E/MS part is unused and in its original packaging.
Return procedure for MCP16311-E/MS:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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