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Monolithic Power Systems Inc. MP2361DQ-LF-Z
- Part No.:
- MP2361DQ-LF-Z
- Manufacturer:
- Monolithic Power Systems Inc.
- Package:
- 10-VFDFN Exposed Pad
- Datasheet:
-
MP2361DQ-LF-Z.pdf
- Description:
- IC REG BUCK ADJ 2A 10QFN
- Quantity:
- Payment:
- Shipping:
Inventory:4,691
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Product details
Overview
MP2361DQ-LF-Z 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 current-mode control. It delivers stable output from 0.92V to 16V across 4.75–23V input, supports programmable soft-start and UVLO, and targets power rails in DSL modems, battery chargers, and distributed systems.
For engineers reviewing the MP2361DQ-LF-Z datasheet, MP2361DQ-LF-Z pinout, MP2361DQ-LF-Z application, or MP2361DQ-LF-Z equivalent, key selection criteria include its QFN10 (3mm × 3mm) thermal performance (θJA = 50°C/W), cycle-by-cycle overcurrent protection, 20μA shutdown quiescent current, and compatibility with low-ESR ceramic output capacitors.
Technical Context
The MP2361DQ-LF-Z implements fixed-frequency current-mode control with a 1.4MHz oscillator and slope compensation to stabilize operation above 40% duty cycle. Its transconductance error amplifier (GEA = 630–1230 μA/V) drives the COMP pin for loop compensation, while frequency foldback activates below 0.4V FB to limit short-circuit current.
It integrates a 0.18Ω high-side switch and 10Ω low-side switch, enabling efficient buck conversion without external MOSFETs. Bootstrap capacitor (BS pin) supplies gate drive for the high-side FET, and the exposed thermal pad must be connected to GND for thermal dissipation up to 2.5W at TA = +25°C.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Current | 2A continuous - supports mid-power system rails without external current boosting. |
| Input Voltage Range | 4.75V to 23V - accommodates 5V, 12V, and 24V industrial/battery inputs with margin. |
| Switching Frequency | Fixed 1.4MHz - enables compact LC filter design with sub-2.2μH inductors. |
| Feedback Voltage | 0.92V ±2.8% - sets output accuracy and allows precise resistor-divider programming. |
| Shutdown Current | 20μA - minimizes standby power loss in always-on or battery-backed applications. |
| Thermal Shutdown | 160°C - protects die during overload or poor PCB thermal layout. |
| Current Limit | 2.8A to 3.5A - provides robust short-circuit protection with cycle-by-cycle sensing. |
Pinout & Package
MP2361DQ-LF-Z uses a 10-pin QFN package (3mm × 3mm, 0.5mm pitch) with an exposed thermal pad on the underside that must be soldered to a GND copper plane for thermal management and electrical stability.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 3 | No Connect | Unused pins - must remain unconnected per datasheet; no internal function. |
| 2 | Bootstrap (BS) | Drives high-side MOSFET gate via external 10nF capacitor; requires floating supply referenced to SW. |
| 4 | Input Supply (IN) | Primary power input (4.75–23V); connects to bulk input capacitor to suppress switching noise. |
| 5 | Switch Node (SW) | Connects to inductor and bootstrap capacitor; carries high di/dt switching current - critical for layout. |
| 6 | GND | Analog and power ground reference; must be tied to exposed thermal pad and kept separate from noisy return paths. |
| 7 | Feedback (FB) | Senses output voltage via resistor divider; 0.92V reference enables accurate regulation down to sub-1V outputs. |
| 8 | Compensation (COMP) | Error amplifier output and current comparator input; used for loop stability via RC network to ground. |
| 9 | Enable/UVLO (EN) | Active-high enable with 2.5V threshold and 210mV hysteresis; supports programmable input undervoltage lockout. |
| 10 | Soft-Start (SS) | Connects to external capacitor to linearly ramp output voltage and limit inrush current at startup. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated 0.18Ω High-Side MOSFET | Reduces external component count and conduction losses - eliminates need for discrete high-side driver. |
| Stable with Ceramic Output Capacitors | Supports low-ESR MLCCs (no tantalum/electrolytic required), lowering BOM cost and improving reliability. |
| Programmable Soft-Start | Prevents output overshoot and limits input inrush by controlling startup slew rate via external SS capacitor. |
| Current-Mode Control | Enables fast transient response and simplifies loop compensation using only two external components (R/C on COMP). |
| Thermal Shutdown + Cycle-by-Cycle OCP | Provides dual-layer fault protection - immediate current limiting plus thermal cutoff for sustained overload conditions. |
Applications
| DSL Modem Power Rail | Battery Charger Pre-Regulator |
|---|---|
Use Scenario: Supplies clean 3.3V or 5V rail to DSL line interface ICs and PHY processors under variable AC-DC adapter input. IC Role / Device Role / Timing Role: Primary buck regulator delivering regulated intermediate voltage; operates at fixed 1.4MHz to avoid interference with DSL band frequencies. Use Value: 90% peak efficiency and 20μA shutdown current extend system uptime and reduce heat in sealed modem enclosures. | Use Scenario: Steps down 12V/19V adapter output to 8.4V or 12.6V for Li-ion charging circuitry before linear charger IC. IC Role / Device Role / Timing Role: High-efficiency pre-regulator reducing power dissipation in downstream linear charger; handles wide input range during adapter swap or brownout. Use Value: 4.75–23V input range and 2A capability support multi-cell battery configurations without redesigning front-end power stage. |
| Distributed Power System | Industrial Sensor Node Supply |
Use Scenario: Generates local 2.5V or 3.3V from 24V factory bus for microcontrollers, ADCs, and isolated communication interfaces. IC Role / Device Role / Timing Role: Point-of-load (POL) converter with tight load regulation (<±1%) and fast transient recovery for burst-mode sensor sampling. Use Value: Current-mode architecture ensures stable regulation under dynamic loads typical of wireless sensor wake/sleep cycles. | Use Scenario: Powers low-power IoT edge node (MCU + RF + analog front-end) from 9–18V industrial supply with extended temperature operation. IC Role / Device Role / Timing Role: Main system regulator operating from –40°C to +125°C junction temperature; uses EN pin for controlled power sequencing. Use Value: Guaranteed operation to +125°C TJ and thermal shutdown prevent field failures in unventilated enclosures. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar step-down converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MP2361DH-LF-Z | Same silicon, MSOP10E package (θJA = 55°C/W); identical electrical specs but different thermal footprint and pinout. | Preferred where board space allows larger MSOP footprint and thermal relief via exposed pad is less critical. | Select when QFN assembly is unavailable or thermal pad soldering is unreliable in production. |
| RT7295BGJ8F | 2A, 23V, 1.4MHz buck with 0.15Ω RDS(ON); lacks programmable UVLO and has 30μA shutdown current. | Used in cost-sensitive consumer power supplies where EN/UVLO flexibility is not required. | Choose only if lower RDS(ON) justifies trade-off in control feature set and higher quiescent current. |
Compared with MP2361DH-LF-Z, the MP2361DQ-LF-Z offers superior thermal performance (50 vs. 55°C/W θJA) and smaller footprint; versus RT7295BGJ8F, it provides tighter feedback tolerance (±2.8% vs. ±3.5%), lower shutdown current (20μA vs. 30μA), and full UVLO programmability.
Availability
MP2361DQ-LF-Z 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 QFN thermal performance.
Supply support for MP2361DQ-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, with design centers in the US, China, and Taiwan.
The MP2361 product line delivers highly integrated, thermally optimized DC/DC converters for space-constrained industrial, telecom, and consumer applications where efficiency, reliability, and minimal external components are critical.
FAQ
What is the minimum recommended output capacitance for stable operation?
The MP2361DQ-LF-Z is stable with low-ESR ceramic capacitors ≥10μF. For 3.3V/2A operation, a 22μF X5R 0805 MLCC with ≤10mΩ ESR meets ripple and stability requirements. Larger values improve transient response but require re-optimizing compensation components.
Can the MP2361DQ-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 unpredictable dropout or shutdown behavior.
Is an external bootstrap diode required for all output voltages?
An external Schottky diode (e.g., IN4148) from VOUT to BS is optional and recommended only for 3.3V or 5V outputs with >65% duty cycle (VIN > 7.7V for 3.3V, VIN > 12V for 5V) to improve efficiency by ~1–2%.
How does the frequency foldback feature affect short-circuit protection?
When FB falls below 0.4V (indicating severe overload or short), the oscillator frequency reduces from 1.4MHz to 210kHz. This lowers average switch current and power dissipation, allowing safe sustained short-circuit operation without thermal shutdown.
What is the maximum allowable PCB trace length between SW and the inductor?
SW trace length should be minimized - ideally ≤5mm - with width ≥0.5mm and direct connection to inductor pad. Long or narrow SW traces increase radiated EMI and cause voltage spikes due to parasitic inductance, risking false triggering of overvoltage protection.
Does the exposed thermal pad require solder mask opening?
Yes - the exposed pad must be fully exposed (no solder mask) and connected to a dedicated GND copper pour with ≥4 thermal vias (0.3mm diameter) to inner/ground layers. Mask coverage degrades thermal resistance and risks premature thermal shutdown under load.
MP2361DQ-LF-Z Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Monolithic Power Systems Inc.
- Series:
- -
- Package/Case:
- 10-VFDFN Exposed Pad
- 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-QFN (3x3)
MP2361DQ-LF-Z FAQ
1.How can I place an order for MP2361DQ-LF-Z through Aetrix?
Please submit a Request for Quotation (RFQ) for MP2361DQ-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 MP2361DQ-LF-Z reliable?
The price and inventory of MP2361DQ-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 MP2361DQ-LF-Z is usually 5 days.
3.What payment methods are accepted for MP2361DQ-LF-Z?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MP2361DQ-LF-Z transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MP2361DQ-LF-Z?
MP2361DQ-LF-Z orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MP2361DQ-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 MP2361DQ-LF-Z?
For technical support, including MP2361DQ-LF-Z datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MP2361DQ-LF-Z requirements.
6.How does Aetrix verify that MP2361DQ-LF-Z is sourced from the original manufacturer or authorized distributors?
All MP2361DQ-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 MP2361DQ-LF-Z meets industry standards.
7.What is the process for return or replacement of MP2361DQ-LF-Z?
All MP2361DQ-LF-Z units undergo pre-shipment inspection (PSI). If there is an issue with MP2361DQ-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 MP2361DQ-LF-Z part is unused and in its original packaging.
Return procedure for MP2361DQ-LF-Z:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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