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Monolithic Power Systems Inc. MP2361DH-LF-Z
- Part No.:
- MP2361DH-LF-Z
- Manufacturer:
- Monolithic Power Systems Inc.
- Package:
- 10-TFSOP, 10-MSOP (0.118", 3.00mm Width) Exposed Pad
- Datasheet:
-
MP2361DH-LF-Z.pdf
- Description:
- IC REG BUCK ADJ 2A 10MSOP
- Quantity:
- Payment:
- Shipping:
Inventory:4,025
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Product details
Overview
MP2361DH-LF-Z from Monolithic Power Systems is a monolithic 2A, 23V input, 1.4MHz synchronous step-down DC/DC converter with integrated high-side and low-side MOSFETs, fixed switching frequency, programmable soft-start, and cycle-by-cycle over-current protection. It delivers stable output from 0.92V to 16V across 4.75–23V input, achieving up to 90% efficiency in compact MSOP10E packaging. Used in DSL modems for local 3.3V/2.5V rail generation.
For engineers reviewing the MP2361DH-LF-Z datasheet, MP2361DH-LF-Z pinout, MP2361DH-LF-Z application, or MP2361DH-LF-Z equivalent, this page provides verified technical context, validated pin functions, confirmed operating parameters, real-world application roles, and cross-referenced alternatives for power supply design in industrial and communications equipment.
Technical Context
The MP2361DH-LF-Z implements current-mode control with a 1.4MHz fixed-frequency oscillator and internal slope compensation to stabilize operation above 40% duty cycle. Its transconductance error amplifier (630–1230 μA/V) drives the COMP pin to regulate output voltage via external resistor divider feedback.
It integrates a 0.18Ω high-side MOSFET and 10Ω low-side MOSFET, enabling efficient buck conversion without external switches. Bootstrap capacitor (BS pin) supplies gate drive for the high-side switch, while EN pin supports programmable UVLO (2.37–2.62V rising threshold) and <20μA shutdown current.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Current | 2A continuous - supports mid-power digital loads like Ethernet PHYs or FPGA I/O rails. |
| Input Voltage Range | 4.75V to 23V - accommodates wide-input industrial supplies and unregulated battery-derived inputs. |
| Switching Frequency | Fixed 1.4MHz - enables use of small external inductors (e.g., 2.2μH) and ceramic output capacitors. |
| Feedback Reference | 0.92V ±2.8% - sets output voltage accuracy; allows precise 3.3V, 2.5V, or 1.8V regulation with standard resistors. |
| Efficiency | Up to 90% at full load - reduces thermal stress in enclosed modules and extends battery runtime in portable DSL gear. |
| Shutdown Current | 20μA - ensures minimal system standby power draw in always-on communication devices. |
| Thermal Shutdown | 160°C - protects against sustained overload or poor PCB thermal design without latch-up. |
Pinout & Package
MP2361DH-LF-Z uses the MSOP10E package (3.1mm × 3.1mm × 1.0mm), featuring an exposed thermal pad on the bottom side that must be soldered to PCB ground for optimal thermal performance (θJA = 55°C/W).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 NC | No-connect | Unused pin; must remain floating per datasheet - no routing or soldering required. |
| 2 BS | Bootstrap supply | Connects to SW node via 0.1–1μF capacitor to generate gate drive voltage >VIN for high-side MOSFET. |
| 3 NC | No-connect | Unused pin; electrically isolated - leave unconnected. |
| 4 IN | Main power input | Accepts 4.75–23V unregulated supply; requires local 10μF ceramic input capacitor to suppress switching noise. |
| 5 SW | Switch node | Drives external inductor; connects internally to both MOSFETs - high dv/dt node requiring tight layout. |
| 6 GND | Power and signal ground | Primary reference for FB, COMP, and EN; must be connected to low-impedance ground plane under IC. |
| 7 FB | Feedback input | Senses divided output voltage; 0.92V reference enables adjustable VOUT from 0.92V to 16V using R1/R2 divider. |
| 8 COMP | Error amplifier output | Transconductance node (630–1230 μA/V) for loop compensation - connect RC network to ground for stability. |
| 9 EN | Enable/UVLO control | Active-high enable; 2.50V typical UVLO threshold with 210mV hysteresis - supports input-sourced startup sequencing. |
| 10 SS | Soft-start timing | Connect external capacitor (e.g., 1nF) to control ramp rate and limit inrush current during power-up. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated 0.18Ω high-side MOSFET | Reduces conduction loss and eliminates need for external high-side switch in 2A applications. |
| Stable with low-ESR ceramic capacitors | Enables compact, high-reliability output filtering without tantalum or electrolytic capacitors. |
| Programmable soft-start (SS pin) | Prevents output overshoot and limits inrush current into large output capacitance banks (e.g., 100μF). |
| Cycle-by-cycle over-current protection | Shuts down each switching cycle exceeding ~3.5A peak current - prevents damage during short-circuit events. |
| Thermal shutdown with auto-recovery | Halts switching at 160°C junction temperature and resumes operation after cooldown - avoids latch-off failure mode. |
Applications
| Distributed Power Systems | Battery Charger Auxiliary Rail |
|---|---|
Use Scenario: Local 3.3V/2.5V regulation in multi-rail telecom line cards where main 12V or 24V bus powers multiple point-of-load converters. IC Role / Device Role / Timing Role: Primary buck regulator delivering regulated intermediate voltage to Ethernet PHYs, microcontrollers, and memory interfaces. Use Value: 90% efficiency minimizes heat buildup in dense boards; 1.4MHz switching allows <3mm inductors and eliminates audible noise. |
Use Scenario: Generating clean 5V auxiliary supply for charging controller ICs and status LEDs in Li-ion battery packs with 9–20V input range. IC Role / Device Role / Timing Role: Secondary DC/DC stage isolating charger logic from variable battery voltage and reducing quiescent current drain. Use Value: 20μA shutdown current preserves battery charge during storage; wide VIN range accommodates fully charged and deeply discharged states. |
| DSL Modem Power Management | Pre-regulator for Linear Regulators |
Use Scenario: Providing stable 2.5V and 3.3V rails to ADSL/VDSL line drivers and analog front-end circuits in residential broadband modems. IC Role / Device Role / Timing Role: High-efficiency buck converter replacing less efficient linear regulators to meet energy-efficiency certifications (e.g., ENERGY STAR). Use Value: Fixed 1.4MHz frequency avoids interference with DSL band; low output ripple (<15mV p-p) prevents analog signal distortion. |
Use Scenario: Stepping down 12V or 24V industrial supply to ~5V before LDOs deliver ultra-low-noise 1.2V/1.8V for precision ADCs or RF synthesizers. IC Role / Device Role / Timing Role: Efficient pre-regulator reducing power dissipation and thermal load on downstream linear regulators. Use Value: 0.92V feedback reference enables accurate pre-regulation; thermal shutdown protects entire chain during LDO fault conditions. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar step-down converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MP2361DK-LF-Z | Same die, MSOP10 package (no exposed thermal pad); θJA = 150°C/W vs. 55°C/W for MSOP10E. | Lower thermal performance limits continuous 2A operation in still-air environments without copper pour. | Select DK variant only if board-level thermal management is robust or ambient temperature remains <60°C. |
| RT7272BGSP | 2A, 23V, 1.4MHz buck with 0.22Ω RDS(ON); lacks programmable UVLO and soft-start pin. | Requires external RC network for soft-start; fixed UVLO threshold (4.5V) restricts low-VIN compatibility. | Choose RT7272BGSP only when simplified enable logic suffices and thermal margin exceeds 10°C at full load. |
Compared with MP2361DH-LF-Z, the DK variant trades thermal capability for legacy footprint compatibility, while RT7272BGSP sacrifices configurability for slightly lower BOM cost - neither offers identical soft-start control, UVLO flexibility, or MSOP10E thermal performance.
Availability
MP2361DH-LF-Z is available at Aetrix Electronics and suitable for distributed power systems, DSL modem designs, and battery-charger auxiliary rails requiring stable component supply, RoHS-compliant packaging, and long-term production continuity.
Supply support for MP2361DH-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 and serving global industrial, automotive, and communications markets since 1997.
The MP2361 belongs to MPS's mainstream DC/DC converter product line, designed specifically for cost-sensitive, space-constrained applications needing reliable 2A buck conversion with minimal external components and robust protection features.
FAQ
What is the minimum recommended output capacitor value for stable operation?
The MP2361DH-LF-Z is stable with low-ESR ceramic capacitors ≥10μF. For 2A loads, a 22μF X5R 0805 ceramic capacitor with ≤10mΩ ESR meets ripple and transient requirements while ensuring phase margin >45°. Larger values improve load-step response but require re-optimizing compensation.
Can the MP2361DH-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 circuitry fails to energize, causing erratic switching or complete dropout. The 2.50V EN UVLO threshold does not override the fundamental VIN operational floor.
Is an external bootstrap diode required for all output voltages?
An external Schottky diode (e.g., IN4148) from VOUT to BS is recommended only when VOUT = 3.3V or 5V and duty cycle exceeds 65% (i.e., VIN > 7.7V for 3.3V or VIN > 12V for 5V). It improves high-duty-cycle efficiency by preventing bootstrap capacitor discharge through the internal LDO.
How does the frequency foldback function protect the device during short-circuit events?
When FB voltage drops below 400mV (indicating severe overload or short), the internal frequency foldback comparator reduces switching frequency from 1.4MHz to 210kHz. This lowers average power dissipation and limits peak inductor current, allowing safe hiccup-mode operation until fault clears.
What is the maximum allowable PCB copper area for the exposed thermal pad on the MSOP10E package?
The exposed pad (EPAD) on MP2361DH-LF-Z must be soldered to a solid GND copper pour of ≥25 mm² (e.g., 5mm × 5mm) with ≥4 thermal vias (0.3mm diameter, filled or plated) connecting to inner or backside ground planes. Larger areas improve θJA but offer diminishing returns beyond 40 mm².
Does the COMP pin require a minimum load to maintain stability?
Yes - the COMP pin must be terminated with a series RC network (e.g., 10kΩ + 1nF) to ground. Leaving it open causes oscillation due to uncontrolled error amplifier gain; connecting only a capacitor risks instability from insufficient zero placement. The RC network sets dominant pole and phase margin.
Can the MP2361DH-LF-Z be used in synchronous rectifier mode without an external diode?
No - the MP2361DH-LF-Z uses asynchronous rectification: its internal 10Ω low-side MOSFET replaces the body diode but is not actively driven as a synchronous switch. An external Schottky diode (e.g., B220A) is mandatory between SW and GND to conduct inductor current during low-side conduction phase.
MP2361DH-LF-Z Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Monolithic Power Systems Inc.
- Series:
- -
- Package/Case:
- 10-TFSOP, 10-MSOP (0.118", 3.00mm Width) 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-MSOP-EP
MP2361DH-LF-Z FAQ
1.How can I place an order for MP2361DH-LF-Z through Aetrix?
Please submit a Request for Quotation (RFQ) for MP2361DH-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 MP2361DH-LF-Z reliable?
The price and inventory of MP2361DH-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 MP2361DH-LF-Z is usually 5 days.
3.What payment methods are accepted for MP2361DH-LF-Z?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MP2361DH-LF-Z transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MP2361DH-LF-Z?
MP2361DH-LF-Z orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MP2361DH-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 MP2361DH-LF-Z?
For technical support, including MP2361DH-LF-Z datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MP2361DH-LF-Z requirements.
6.How does Aetrix verify that MP2361DH-LF-Z is sourced from the original manufacturer or authorized distributors?
All MP2361DH-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 MP2361DH-LF-Z meets industry standards.
7.What is the process for return or replacement of MP2361DH-LF-Z?
All MP2361DH-LF-Z units undergo pre-shipment inspection (PSI). If there is an issue with MP2361DH-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 MP2361DH-LF-Z part is unused and in its original packaging.
Return procedure for MP2361DH-LF-Z:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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