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Monolithic Power Systems Inc. MP2361DK-LF-Z
- Part No.:
- MP2361DK-LF-Z
- Manufacturer:
- Monolithic Power Systems Inc.
- Package:
- 10-TFSOP, 10-MSOP (0.118", 3.00mm Width)
- Datasheet:
-
MP2361DK-LF-Z.pdf
- Description:
- IC REG BUCK ADJ 2A 10MSOP
- Quantity:
- Payment:
- Shipping:
Inventory:1,793
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Product details
Overview
MP2361DK-LF-Z from Monolithic Power Systems is a 2A, 23V input, fixed 1.4MHz synchronous step-down DC/DC converter in MSOP-10 package with integrated 0.18Ω high-side MOSFET and 10Ω low-side switch. It delivers stable 0.92V–16V adjustable output voltage with 90% peak efficiency and supports 4.75V–23V wide input range. Used as primary power stage in DSL modems and battery chargers requiring compact, thermally robust regulation.
For engineers reviewing the MP2361DK-LF-Z datasheet, MP2361DK-LF-Z pinout, MP2361DK-LF-Z application, or MP2361DK-LF-Z equivalent, this page provides verified technical context, validated pin functions, real-world application cards, and confirmed alternative parts for industrial embedded and distributed power designs.
Technical Context
The MP2361DK-LF-Z implements current-mode control with 1.4MHz fixed-frequency oscillator and internal slope compensation to stabilize duty cycles above 40%. Its transconductance error amplifier (630–1230μA/V) drives the COMP pin, enabling fast transient response via direct peak inductor current sensing.
It integrates dual MOSFETs - a 0.18Ω high-side switch and 10Ω low-side switch - with cycle-by-cycle over-current protection triggered at 2.8–3.5A and thermal shutdown at 160°C. Programmable soft-start via external capacitor minimizes inrush current and output overshoot during startup.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Current | 2A continuous - supports full-load operation without derating under typical PCB thermal conditions. |
| Input Voltage Range | 4.75V to 23V - enables direct use with 5V, 12V, and 24V rails in industrial and telecom systems. |
| Switching Frequency | Fixed 1.4MHz - allows small external magnetics and ceramic capacitors while avoiding AM radio band interference. |
| Feedback Voltage | 0.920V ±2.8% - sets precise output regulation point; used with resistor divider to configure 0.92V–16V output range. |
| Shutdown Current | 20μA - ensures ultra-low system standby power in battery-backed or energy-sensitive applications. |
| Internal MOSFET RDS(ON) | 0.18Ω high-side - reduces conduction loss at 2A load, contributing to 90% peak efficiency at mid-load. |
| Thermal Shutdown | 160°C junction temperature - protects die integrity during overload or poor heatsinking without latch-up. |
Pinout & Package
MP2361DK-LF-Z uses the MSOP-10 (3mm × 3mm) package with exposed thermal pad on underside, rated for 0.83W continuous power dissipation at +25°C ambient. Pin 1 is marked by half-circle index; exposed pad must be soldered to PCB ground plane for thermal and electrical performance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 NC | No Connect | Internally unconnected; leave floating or tie to GND per layout best practice. |
| 2 BS | Bootstrap Supply | Connects to SW node via 10nF capacitor to generate gate drive voltage >VIN for high-side MOSFET. |
| 3 NC | No Connect | Internally unconnected; no routing required. |
| 4 IN | Input Supply | Accepts 4.75V–23V unregulated input; requires local 10μF+ low-ESR ceramic capacitor for stability. |
| 5 SW | Switch Node | Drives external inductor; carries high di/dt switching current - minimize trace length and loop area. |
| 6 GND | Power Ground | Main return path for switching current; connect directly to exposed thermal pad and input/output caps. |
| 7 FB | Feedback Input | Senses output voltage via resistor divider; 0.92V reference enables accurate output programming. |
| 8 COMP | Compensation Node | Transconductance error amplifier output; external RC network sets loop stability and phase margin. |
| 9 EN | Enable / UVLO | Active-high enable; 2.50V threshold with 210mV hysteresis enables programmable input undervoltage lockout. |
| 10 SS | Soft-Start | Connects to external capacitor to linearly ramp COMP voltage and limit inrush current at startup. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated Power Stage | 0.18Ω high-side + 10Ω low-side MOSFETs eliminate external switch count and reduce BOM cost. |
| Ceramic-Capacitor Stable | Operates with low-ESR ceramic output caps down to 10μF - avoids bulkier tantalum/electrolytic solutions. |
| Programmable UVLO | Resistor-divider configurable EN pin threshold enables custom input brown-out recovery behavior. |
| Current-Mode Control | Provides inherent line/load transient immunity and simplifies loop compensation vs. voltage-mode designs. |
| Frequency Foldback | Reduces switching frequency to 210kHz during short-circuit - lowers power dissipation and improves fault survival. |
Applications
| DSL Modem Power Supply | Battery Charger Pre-Regulator |
|---|---|
|
Use Scenario: Powers ADSL/VDSL line card ICs and analog front-end circuitry from 12V or 24V wall adapter. IC Role / Device Role / Timing Role: Primary buck regulator delivering 3.3V/2A or 5V/2A with tight load regulation and low noise. Use Value: 1.4MHz switching enables <10mm² solution size; 90% efficiency reduces thermal load in sealed modem enclosures. |
Use Scenario: Steps down 19V laptop adapter or 24V industrial supply to 8.4V for Li-ion charging circuitry. IC Role / Device Role / Timing Role: Constant-voltage pre-regulator feeding linear charger IC; handles variable input and dynamic load steps. Use Value: Wide 4.75V–23V input accommodates adapter tolerance and battery sag; programmable soft-start prevents charger IC reset. |
| Distributed Telecom Power | Industrial Sensor Node Supply |
|
Use Scenario: Generates 5V rail for FPGA I/O banks and Ethernet PHYs in remote radio units or base station modules. IC Role / Device Role / Timing Role: Point-of-load converter with fast transient response to handle bursty data traffic loads. Use Value: Current-mode architecture delivers <50μs load-step recovery; thermal shutdown protects against airflow-blocked enclosures. |
Use Scenario: Powers low-power microcontroller, RF transceiver, and analog sensor chain from 12V field bus or solar input. IC Role / Device Role / Timing Role: Main system regulator with 20μA shutdown mode enabling multi-year battery life in sleep states. Use Value: Adjustable 0.92V–16V output supports diverse MCU core voltages; MSOP-10 footprint fits space-constrained PCBs. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar step-down converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MP2361DQ-LF-Z | Same silicon, QFN10 (3×3mm) package with 2.5W thermal rating vs. MSOP10's 0.83W. | Better thermal performance in high-ambient or high-duty-cycle applications; requires different land pattern. | Select when board layout allows QFN footprint and thermal management demands >1.5W dissipation. |
| RT7295BGJ8F | 2A, 23V, 1.4MHz buck with 0.12Ω RDS(ON), but no integrated low-side switch - requires external Schottky diode. | Higher efficiency at light load due to diode conduction, but larger solution size and higher BOM count. | Choose when absolute peak efficiency >92% is critical and board space permits discrete rectifier placement. |
Compared with MP2361DK-LF-Z, the MP2361DQ-LF-Z offers superior thermal handling in compact layouts, while the RT7295BGJ8F trades integration for marginal efficiency gain at the cost of added components and layout complexity.
Availability
MP2361DK-LF-Z is available at Aetrix Electronics and suitable for DSL modems, battery charger pre-regulators, and distributed telecom power systems requiring stable component supply, RoHS-compliant packaging, and long-term industrial availability.
Supply support for MP2361DK-LF-Z 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, headquartered in California with global design and support centers.
The MP2361 belongs to MPS's high-efficiency DC/DC converter product line, designed specifically for space-constrained industrial, telecom, and consumer power applications demanding wide input range and minimal external components.
FAQ
What is the minimum recommended output capacitance for stable operation?
The MP2361DK-LF-Z is stable with ≥10μF ceramic output capacitance and ESR ≤10mΩ. Typical designs use 22μF X5R 0805 ceramics; lower ESR values improve ripple rejection and transient response without requiring additional bulk capacitance.
Can the MP2361DK-LF-Z operate with an input voltage below 4.75V?
No - the absolute minimum operating input voltage is 4.75V per datasheet specifications. Below this, the internal bias regulators cannot sustain proper gate drive or error amplifier operation, resulting in undefined behavior or failure to start.
Is an external bootstrap diode required for standard operation?
An external bootstrap diode (e.g., IN4148) is optional and only recommended when VOUT = 3.3V or 5V and duty cycle exceeds 65% (i.e., VIN > 7.7V for 3.3V out). It improves high-duty-cycle efficiency by reducing BST capacitor discharge losses.
How does the frequency foldback feature behave during overload?
When FB voltage drops below 400mV (indicating severe overload or short circuit), the oscillator frequency folds back from 1.4MHz to 210kHz. This reduces switching losses and thermal stress while maintaining regulation attempt - enabling safe, recoverable fault operation.
What is the maximum allowable PCB copper area for the exposed thermal pad?
The MSOP-10 exposed pad has no upper limit for copper area - larger GND planes improve thermal resistance (θJA) and reliability. Recommended minimum is 100mm²; full-layer connection with ≥4 thermal vias (0.3mm diameter) to inner GND planes achieves optimal θJA ≈ 150°C/W.
Does the EN pin support logic-level interfacing with 3.3V microcontrollers?
Yes - the EN pin has 2.50V turn-on threshold with 210mV hysteresis and draws only 1.0μA when pulled low. A 3.3V GPIO can directly drive EN without level-shifting; internal pull-up ensures automatic startup if left floating.
What is the impact of omitting the soft-start capacitor on SS pin?
Leaving SS open disables soft-start, causing immediate full COMP voltage assertion at startup. This results in high inrush current, potential input voltage droop, and output overshoot exceeding 10% - risking damage to downstream capacitors or ICs.
MP2361DK-LF-Z Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Monolithic Power Systems Inc.
- Series:
- -
- Package/Case:
- 10-TFSOP, 10-MSOP (0.118", 3.00mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Not For New Designs
- 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-Z FAQ
1.How can I place an order for MP2361DK-LF-Z through Aetrix?
Please submit a Request for Quotation (RFQ) for MP2361DK-LF-Z 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-Z reliable?
The price and inventory of MP2361DK-LF-Z 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-Z is usually 5 days.
3.What payment methods are accepted for MP2361DK-LF-Z?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MP2361DK-LF-Z transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MP2361DK-LF-Z?
MP2361DK-LF-Z orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MP2361DK-LF-Z 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-Z?
For technical support, including MP2361DK-LF-Z datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MP2361DK-LF-Z requirements.
6.How does Aetrix verify that MP2361DK-LF-Z is sourced from the original manufacturer or authorized distributors?
All MP2361DK-LF-Z 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-Z meets industry standards.
7.What is the process for return or replacement of MP2361DK-LF-Z?
All MP2361DK-LF-Z units undergo pre-shipment inspection (PSI). If there is an issue with MP2361DK-LF-Z, 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-Z part is unused and in its original packaging.
Return procedure for MP2361DK-LF-Z:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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