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Monolithic Power Systems Inc. MP2451DT-LF-P
- Part No.:
- MP2451DT-LF-P
- Manufacturer:
- Monolithic Power Systems Inc.
- Package:
- SOT-23-6
- Datasheet:
-
MP2451DT-LF-P.pdf
- Description:
- IC REG BUCK ADJ 600MA SOT23-6
- Quantity:
- Payment:
- Shipping:
Inventory:3,772
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Product details
Overview
MP2451DT-LF-P from Monolithic Power Systems is a 36V, 2MHz, 0.6A non-synchronous step-down DC/DC converter with integrated 500mΩ high-side MOSFET, current-mode control, and internal soft-start. It operates from 3.3V to 36V input, delivers adjustable output from 0.8V to 0.8×VIN, and achieves >90% efficiency in automotive power rails and industrial distributed supplies.
For engineers reviewing the MP2451DT-LF-P datasheet, MP2451DT-LF-P pinout, MP2451DT-LF-P application, or MP2451DT-LF-P equivalent, key selection criteria include its 2MHz fixed switching frequency, 3μA shutdown current, internal compensation for ceramic output capacitors, and SOT23-6 thermal performance (θJA = 220°C/W).
Technical Context
The MP2451DT-LF-P implements peak-current-mode PWM control with cycle-by-cycle precision current limiting and frequency fold-back during start-up to prevent inductor current runaway. Its error amplifier uses an internal R-C network and reference voltage (0.794V typ) for stable regulation without external compensation components.
Operation includes pulse-skipping mode at light load to reduce gate-driving and switching losses, achieving 130μA quiescent current under no-load conditions. Bootstrap charging is managed via an internal regulator targeting ~5V between BST and SW pins, with UVLO protection (2.9V rising threshold) on both VIN and floating driver rails.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 3.3V to 36V - supports direct connection to automotive battery (12V/24V) and industrial 24–36V rails without pre-regulation. |
| Switching Frequency | 2MHz fixed - enables compact LC filter design with ≤3.3μH inductors and reduces EMI fundamental below 10MHz. |
| Output Current | 0.6A continuous - sufficient for powering microcontrollers, sensors, and interface ICs in space-constrained applications. |
| Feedback Reference | 0.794V typical - sets output voltage via external resistor divider; tolerance ±2.5% ensures <±3% VOUT accuracy over line/load/temperature. |
| Quiescent Current | 130μA - maintains low standby power in always-on systems such as telematics and battery-backed controllers. |
| Shutdown Current | 3μA - extends battery life in portable instrumentation and remote sensors during deep sleep modes. |
| Internal MOSFET RDS(on) | 500mΩ - minimizes conduction loss at 0.6A, enabling >90% efficiency at mid-load with proper layout and component selection. |
| Soft-Start Time | 0.5ms - controls output ramp rate to prevent inrush current and overshoot during power-up in sensitive analog subsystems. |
Pinout & Package
SOT23-6 package: 2.9mm × 2.8mm × 1.3mm body, gull-wing leads, JEDEC MO-178 compliant, rated for 0.57W continuous power dissipation at +25°C ambient.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| BST | Bootstrap supply for high-side driver | Must connect 0.1μF ceramic capacitor between BST and SW to sustain gate drive voltage during high-duty-cycle operation. |
| GND | Power and signal ground reference | Low-impedance connection to output capacitor negative terminal required to minimize noise coupling into FB and COMP nodes. |
| FB | Feedback input to error amplifier | Compares divided output voltage against 0.794V internal reference; placement of R1/R2 divider directly adjacent to pin critical for stability. |
| EN | Enable control input (active-high) | Logic threshold 1.55V typ; internal pull-down ensures default disable; clamped at 7.5V to protect against overvoltage transients. |
| VIN | Main input power supply | Accepts full 3.3–36V range; requires local 4.7μF ceramic decoupling capacitor placed within 2mm of pin to suppress switching noise. |
| SW | Switch node output | Connects to inductor and external Schottky diode cathode; high dv/dt node requiring short, wide trace routing away from analog signals. |
Key Features
| Feature | Design Value |
|---|---|
| Internally compensated | Eliminates need for external Type-II/III compensation network-reduces BOM count and layout sensitivity for 0.8–12V outputs with ceramic capacitors. |
| Precision current limit | 1.0A cycle-by-cycle limit without sense resistor-enables robust short-circuit protection while minimizing board area and thermal stress. |
| Stable with ceramic output capacitors | Supports low-ESR MLCCs down to 10μF-avoids bulkier tantalum/electrolytic caps and improves reliability in temperature-cycling environments. |
| Frequency fold-back at start-up | Reduces switching frequency during soft-start to limit peak inductor current-prevents saturation and ensures reliable cold-start in automotive applications. |
| Thermal shutdown | Triggers at 150°C junction temperature with hysteresis-protects device during overload or poor heatsinking while allowing automatic recovery when cooled. |
| UVLO on VIN and BST | VIN UVLO rises at 2.9V (0.4V hysteresis); BST UVLO rises at 2.4V-ensures clean enable/disable sequencing and prevents erratic switching during brown-out conditions. |
Applications
| Automotive Body Control Module | Industrial PLC I/O Power |
|---|---|
Use Scenario: Powering CAN transceivers, LIN bus interfaces, and door-lock actuators from 12V battery rail with load dumps up to 36V. IC Role / Device Role / Timing Role: Primary 3.3V/5V point-of-load regulator delivering regulated supply to communication peripherals and microcontroller peripherals. Use Value: Wide 3.3–36V input range tolerates automotive transients; 2MHz switching avoids AM radio band; 3μA shutdown preserves battery during vehicle sleep mode. | Use Scenario: Generating isolated 5V logic supply for digital input/output modules in factory automation cabinets with 24V DC field power. IC Role / Device Role / Timing Role: Non-isolated buck converter supplying FPGA configuration voltage and sensor interface circuitry in modular I/O cards. Use Value: Internal MOSFET eliminates external switch; SOT23-6 footprint fits dense PCB layouts; >90% efficiency reduces thermal load in sealed enclosures. |
| Battery-Powered Telematics Unit | Distributed Telecom Power |
Use Scenario: Regulating 3.3V supply for GPS/GSM modules and MCU in asset trackers powered by Li-ion or lead-acid batteries. IC Role / Device Role / Timing Role: Main system power converter operating across battery discharge range (3.6V–12.6V) with ultra-low quiescent current during idle periods. Use Value: 130μA operating IQ and 3μA shutdown current extend operational lifetime; pulse-skipping mode maintains regulation down to 10μA load. | Use Scenario: Providing 12V intermediate rail from 48V telecom backplane to downstream POL converters in base station remote radio units. IC Role / Device Role / Timing Role: Pre-regulator stage stepping 48V down to 12V before final LDO or secondary buck conversion for RF front-end biasing. Use Value: 36V absolute max rating allows safe operation with 48V transient surges; 2MHz operation enables small magnetics for high-power-density designs. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar step-down converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LMR14006XDDAR | 40V max input, 600mA, 2.1MHz, requires external compensation, higher IQ (26μA) | Needs external RC network; less suitable for cost-sensitive, space-constrained designs where internal compensation is preferred | Select if higher input voltage margin or TI ecosystem compatibility is required; avoid if ceramic-capacitor-only design is mandatory |
| TPS54202DRCT | 6V max input, 2A, 500kHz, integrated FET, requires external compensation, lower voltage rating | Not suitable for automotive or industrial 24V+ inputs; better for low-voltage embedded systems with higher current demand | Choose only for sub-6V input applications needing >0.6A; reject for any design requiring >12V input or 2MHz switching |
Compared with MP2451DT-LF-P, LMR14006XDDAR offers higher input voltage headroom but adds design complexity with external compensation, while TPS54202DRCT delivers higher current at lower frequency but cannot support automotive or industrial input ranges - making MP2451DT-LF-P optimal for compact, high-frequency, wide-input buck conversion where simplicity and integration are prioritized.
Availability
MP2451DT-LF-P is available at Aetrix Electronics and suitable for automotive body electronics, industrial PLC I/O modules, battery-powered telematics units, and distributed telecom power systems requiring stable component supply with guaranteed long-term sourcing.
Supply support for MP2451DT-LF-P 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 core expertise in DC/DC conversion, LED drivers, and motor control solutions.
The MP2451 belongs to MPS's high-voltage buck converter product line, designed specifically for space-constrained, wide-input applications in automotive, industrial, and battery-powered systems where integration, efficiency, and reliability are critical.
FAQ
What is the maximum recommended output voltage for MP2451DT-LF-P?
The MP2451DT-LF-P supports output voltages from 0.8V up to 0.8×VIN. With a 36V maximum input, the theoretical upper limit is 28.8V-but practical use is constrained by the 0.6A current limit and thermal limits of the SOT23-6 package. For reliable operation, outputs above 12V require careful thermal design and reduced load current to maintain junction temperature below 125°C.
Can MP2451DT-LF-P operate with only ceramic capacitors on input and output?
Yes-MP2451DT-LF-P is explicitly designed for stability with ceramic output capacitors (≥10μF) and does not require ESR-based damping. Input capacitance must be ≥4.7μF ceramic, placed within 2mm of VIN and GND pins. No electrolytic or tantalum capacitors are needed, simplifying BOM and improving lifetime reliability.
Why does the BST pin require a capacitor to SW instead of GND?
The BST capacitor forms a flying charge pump that supplies gate drive voltage to the high-side MOSFET. Connecting it between BST and SW allows the capacitor to recharge during the low-side conduction phase (when SW ≈ GND), maintaining ~5V gate-to-source voltage even when VIN is close to VOUT. A BST-to-GND connection would fail to generate the required floating bias.
How does pulse-skipping mode improve light-load efficiency?
In pulse-skipping mode, the MP2451DT-LF-P disables switching cycles when output energy demand falls below a threshold, reducing gate-driving and switching losses. This lowers average quiescent current to 130μA and maintains regulation without forced continuous conduction-critical for battery runtime extension in intermittent-use devices like wireless sensors.
Is MP2451DT-LF-P RoHS and REACH compliant?
Yes-MP2451DT-LF-P carries the "-LF" suffix indicating lead-free and halogen-free construction, fully compliant with RoHS Directive 2011/65/EU and REACH Regulation (EC) No. 1907/2006. MPS confirms green status via its Quality Assurance portal, with material declarations available upon request for full supply chain traceability.
What is the minimum inductor value recommended for 12V input to 3.3V output?
For VIN=12V, VOUT=3.3V, and fSW=2MHz, the recommended inductor is 3.3μH (per MPS Application Note AN107). This yields ~30% peak-to-peak ripple current at 0.6A load and avoids saturation-validated in Figure 3 of the datasheet using Wurth 744043003 or equivalent. Lower values increase ripple and risk instability; higher values reduce ripple but degrade transient response.
Does MP2451DT-LF-P support synchronization to an external clock?
No-MP2451DT-LF-P features a fixed 2MHz internal oscillator with no SYNC pin or frequency adjustment capability. It is not synchronizable. For designs requiring clock alignment (e.g., multi-rail systems), consider MPS's MPQ4420A or alternative families with external sync functionality.
MP2451DT-LF-P Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Monolithic Power Systems Inc.
- Series:
- -
- Package/Case:
- SOT-23-6
- 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):
- 3.3V
- Voltage - Input (Max):
- 36V
- Voltage - Output (Min/Fixed):
- 0.8V
- Voltage - Output (Max):
- 28.8V
- Current - Output:
- 600mA
- Frequency - Switching:
- 2MHz
- Synchronous Rectifier:
- No
- Operating Temperature:
- -40°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-6
MP2451DT-LF-P FAQ
1.How can I place an order for MP2451DT-LF-P through Aetrix?
Please submit a Request for Quotation (RFQ) for MP2451DT-LF-P 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 MP2451DT-LF-P reliable?
The price and inventory of MP2451DT-LF-P are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MP2451DT-LF-P is usually 5 days.
3.What payment methods are accepted for MP2451DT-LF-P?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MP2451DT-LF-P transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MP2451DT-LF-P?
MP2451DT-LF-P orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MP2451DT-LF-P 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 MP2451DT-LF-P?
For technical support, including MP2451DT-LF-P datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MP2451DT-LF-P requirements.
6.How does Aetrix verify that MP2451DT-LF-P is sourced from the original manufacturer or authorized distributors?
All MP2451DT-LF-P 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 MP2451DT-LF-P meets industry standards.
7.What is the process for return or replacement of MP2451DT-LF-P?
All MP2451DT-LF-P units undergo pre-shipment inspection (PSI). If there is an issue with MP2451DT-LF-P, 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 MP2451DT-LF-P part is unused and in its original packaging.
Return procedure for MP2451DT-LF-P:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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