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Monolithic Power Systems Inc. MP2361DK-LF
- Part No.:
- MP2361DK-LF
- Manufacturer:
- Monolithic Power Systems Inc.
- Package:
- 10-TFSOP, 10-MSOP (0.118", 3.00mm Width)
- Datasheet:
-
MP2361DK-LF.pdf
- Description:
- IC REG BUCK ADJ 2A 10MSOP
- Quantity:
- Payment:
- Shipping:
Inventory:3,100
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Product details
Overview
MP2361DK-LF from Monolithic Power Systems is a monolithic 2A, 23V input, 1.4MHz synchronous step-down DC/DC converter with integrated 0.18Ω high-side MOSFET and 10Ω low-side switch, delivering regulated output from 0.92V to 16V across 4.75–23V input range, used in DSL modems and battery charger pre-regulation stages.
For engineers reviewing the MP2361DK-LF datasheet, MP2361DK-LF pinout, MP2361DK-LF application, or MP2361DK-LF equivalent, key selection criteria include its fixed 1.4MHz switching frequency, programmable soft-start, cycle-by-cycle over-current protection, thermal shutdown, and compatibility with low-ESR ceramic output capacitors.
Technical Context
The MP2361DK-LF employs current-mode control architecture with a transconductance error amplifier (630–1230 μA/V) and slope-compensated peak-current sensing, enabling fast transient response and stable loop behavior across wide duty cycles. Its 1.4MHz oscillator supports compact external components and avoids AM band interference.
It integrates bootstrap circuitry for high-side gate drive, uses an internal 0.92V reference for feedback regulation, and implements frequency foldback during short-circuit conditions (FB < 400mV), reducing power dissipation and thermal stress under fault conditions.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Current | 2A continuous - supports mid-power embedded rails without external current boosting. |
| Input Voltage Range | 4.75V to 23V - accommodates 5V, 12V, and 19V adapter inputs and industrial bus supplies. |
| Switching Frequency | Fixed 1.4MHz - enables use of sub-2.2μH inductors and reduces solution footprint vs. lower-frequency converters. |
| Feedback Reference | 0.92V ±2.8% - sets output voltage via resistor divider; enables precise 3.3V/5V/12V generation with <1% error. |
| Internal MOSFET RDS(ON) | 0.18Ω high-side - limits conduction loss at 2A to ~720mW, supporting >90% efficiency at medium loads. |
| Shutdown Current | 20μA - ensures ultra-low quiescent draw in battery-backed or always-on standby systems. |
| Thermal Shutdown | 160°C - protects die during overload or poor PCB thermal design; auto-recovery on cooldown. |
Pinout & Package
MP2361DK-LF is housed in a thermally enhanced MSOP-10 package (3mm × 3mm, 0.5mm pitch) with exposed pad tied to GND for improved heat dissipation and EMI reduction.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 3 NC | No-connect | Unused pins; must remain unconnected per datasheet to avoid parasitic coupling or latch-up. |
| 2 BS | Bootstrap supply | Connects to SW node via 10nF capacitor to generate floating gate drive voltage for high-side MOSFET. |
| 4 IN | Main input supply | Accepts 4.75–23V unregulated input; requires local 10μF ceramic capacitor for high-frequency decoupling. |
| 5 SW | Power switch node | Drives external inductor; carries high di/dt switching current - demands tight layout with minimal trace inductance. |
| 6 GND | Analog & power ground | Single-point reference for FB, COMP, and EN; must be connected directly to exposed pad and input/output caps. |
| 7 FB | Voltage feedback input | Senses divided output voltage; 0.92V threshold determines regulation point; sensitive to noise - route away from SW. |
| 8 COMP | Error amplifier output | Transconductance node for loop compensation; connects to RC network to set pole-zero for stability. |
| 9 EN | Enable / UVLO input | Active-high enable (2.62V threshold); supports programmable UVLO using resistor divider from IN to GND. |
| 10 SS | Soft-start timing | Connects to external capacitor to linearly ramp COMP voltage, limiting inrush current and output overshoot. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated 0.18Ω high-side MOSFET | Eliminates need for external high-side switch and driver, reducing BOM count and board area by ≥30%. |
| Stable with ceramic output capacitors | Supports low-ESR MLCCs down to 10μF - avoids bulkier tantalum/electrolytic caps and improves reliability. |
| Programmable soft-start | External SS capacitor sets startup time (e.g., 100nF ≈ 10ms), preventing input rail collapse during cold boot. |
| Cycle-by-cycle over-current protection | Detects peak inductor current each cycle - provides immediate shutdown during short-circuit or overload events. |
| Frequency foldback under fault | Reduces switching frequency to 210kHz when FB < 400mV - lowers power dissipation and junction temperature during shorts. |
Applications
| DSL Modem Power Supply | Battery Charger Pre-Regulator |
|---|---|
Use Scenario: Powers line-card PHY and analog front-end in ADSL/VDSL modems from 12V or 19V wall adapters. IC Role / Device Role / Timing Role: Primary buck regulator generating stable 3.3V/5V rails for digital logic and analog signal conditioning. Use Value: Fixed 1.4MHz operation avoids interference with DSL upstream bands; 2A capability supports multi-port designs with headroom. | Use Scenario: Steps down 19V laptop adapter or 24V industrial supply to 12V/9V before linear charging ICs. IC Role / Device Role / Timing Role: Efficient pre-regulator minimizing heat in downstream linear chargers and improving overall system efficiency. Use Value: Wide 4.75–23V input range accepts variable adapter voltages; 90% efficiency reduces thermal load on enclosure. |
| Distributed Power System | Industrial Sensor Node |
Use Scenario: Provides isolated 5V/3.3V rails in multi-board rack systems where centralized 12V/24V backplane feeds local DC/DC converters. IC Role / Device Role / Timing Role: Local point-of-load (POL) regulator converting backplane voltage to processor and interface I/O rails. Use Value: MSOP-10 package fits dense layouts; thermal shutdown and UVLO ensure robustness in unattended deployments. | Use Scenario: Powers microcontroller, RF transceiver, and analog sensor circuitry in battery-operated industrial IoT nodes. IC Role / Device Role / Timing Role: Main system power converter enabling long battery life via low 20μA shutdown current and high light-load efficiency. Use Value: Programmable soft-start prevents brownout during wake-up; 0.92V reference allows accurate low-voltage rail generation. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar step-down converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MP2361DS-LF | SOIC-8 package; higher θJA (90°C/W) vs. MSOP-10 (150°C/W); no exposed thermal pad. | Lower power density; suited for cost-sensitive, non-thermally constrained designs with larger PCB area. | Select when thermal margin is sufficient and through-hole or legacy SOIC assembly is required. |
| RT8205A-ZSP | 2A, 24V, 500kHz; higher RDS(ON) (0.22Ω); no frequency foldback; different pinout and compensation scheme. | Larger inductor needed; less robust under sustained short-circuit; requires re-optimization of compensation network. | Choose only if 500kHz operation is mandatory for EMI filtering or legacy design reuse. |
Compared with MP2361DS-LF, MP2361DK-LF offers superior thermal performance and smaller footprint; versus RT8205A-ZSP, it delivers higher efficiency at 1.4MHz and built-in fault mitigation features critical for field-deployed equipment.
Availability
MP2361DK-LF is available at Aetrix Electronics and suitable for DSL modems, battery charger pre-regulators, and distributed power systems requiring stable component supply, RoHS-compliant packaging, and full production traceability.
Supply support for MP2361DK-LF 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
Monolithic Power Systems (MPS) is a fabless semiconductor company specializing in high-performance analog and power ICs, with design centers in the US, China, and Taiwan, and global distribution since 1997.
The MP2361 belongs to MPS's high-efficiency DC/DC converter product line, engineered for space-constrained, thermally demanding applications in communications infrastructure, industrial automation, and consumer electronics.
FAQ
What is the minimum recommended output capacitance for stable operation?
The MP2361DK-LF is stable with ceramic output capacitors as low as 10μF. A typical design uses 22–47μF X5R/X7R MLCCs with ≤10mΩ ESR. Larger values improve ripple suppression but require compensation adjustment per the datasheet's pole-zero equations.
Can the MP2361DK-LF operate with an input voltage below 4.75V?
No. The absolute minimum operating input voltage is 4.75V per the Recommended Operating Conditions table. Below this, the internal bias regulators cannot sustain proper gate drive or error amplifier function, causing erratic regulation or dropout.
Is an external Schottky diode required for basic operation?
Yes. The MP2361DK-LF uses asynchronous topology with an internal 10Ω low-side switch, so an external Schottky diode (e.g., B220A) is mandatory between SW and GND to provide freewheeling path during high-side off-time.
How does the EN pin's UVLO function differ from standard enable behavior?
The EN pin combines enable and programmable UVLO: rising threshold is 2.50V (±130mV hysteresis). When driven by a resistor divider from VIN, it disables the part if input drops below VUVLO, preventing brownout operation and ensuring clean restart above the hysteresis threshold.
What is the purpose of the BS pin, and what capacitor value is recommended?
The BS pin supplies gate drive voltage to the high-side MOSFET via a bootstrap capacitor connected between BS and SW. A 10nF ceramic capacitor is standard; values from 4.7nF to 22nF are acceptable depending on duty cycle and switching losses.
Does the MP2361DK-LF support adjustable switching frequency?
No. The MP2361DK-LF has a factory-trimmed fixed 1.4MHz oscillator. Frequency cannot be adjusted externally. For variable-frequency operation, consider MPS's MP2451 or MPQ4420A families.
What thermal derating applies when using the MSOP-10 package without PCB copper pour?
In free-air (no heatsinking), the MSOP-10 package has θJA = 150°C/W. At 25°C ambient, maximum continuous power dissipation is limited to ~0.83W - corresponding to ~1.3A load at 12V input/5V output. Use thermal vias and GND copper pour to maintain safe junction temperature.
MP2361DK-LF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Monolithic Power Systems Inc.
- Series:
- MP
- Package/Case:
- 10-TFSOP, 10-MSOP (0.118", 3.00mm Width)
- Packaging:
- Tube
- Product Status:
- Discontinued at Digi-Key
- Function:
- Step-Down
- Output Configuration:
- Positive
- Topology:
- Buck
- Output Type:
- Adjustable
- Number of Outputs:
- 1
- Voltage - Input (Min):
- 4.75V
- Voltage - Input (Max):
- 23V
- Voltage - Output (Min/Fixed):
- 0.92V
- Voltage - Output (Max):
- 16V
- Current - Output:
- 2A
- Frequency - Switching:
- 1.4MHz
- Synchronous Rectifier:
- No
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 10-MSOP
MP2361DK-LF FAQ
1.How can I place an order for MP2361DK-LF through Aetrix?
Please submit a Request for Quotation (RFQ) for MP2361DK-LF 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 MP2361DK-LF reliable?
The price and inventory of MP2361DK-LF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MP2361DK-LF is usually 5 days.
3.What payment methods are accepted for MP2361DK-LF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MP2361DK-LF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MP2361DK-LF?
MP2361DK-LF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MP2361DK-LF 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 MP2361DK-LF?
For technical support, including MP2361DK-LF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MP2361DK-LF requirements.
6.How does Aetrix verify that MP2361DK-LF is sourced from the original manufacturer or authorized distributors?
All MP2361DK-LF 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 MP2361DK-LF meets industry standards.
7.What is the process for return or replacement of MP2361DK-LF?
All MP2361DK-LF units undergo pre-shipment inspection (PSI). If there is an issue with MP2361DK-LF, 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 MP2361DK-LF part is unused and in its original packaging.
Return procedure for MP2361DK-LF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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