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Monolithic Power Systems Inc. MP2451DJ-LF-Z
- Part No.:
- MP2451DJ-LF-Z
- Manufacturer:
- Monolithic Power Systems Inc.
- Package:
- SOT-23-6 Thin, TSOT-23-6
- Datasheet:
-
MP2451DJ-LF-Z.pdf
- Description:
- IC REG BUCK ADJ 600MA TSOT23-6
- Quantity:
- Payment:
- Shipping:
Inventory:2,874
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Product details
Overview
MP2451DJ-LF-Z from Monolithic Power Systems is a 36V, 2MHz, 0.6A non-synchronous step-down DC/DC converter with integrated 500mΩ high-side MOSFET, internal soft-start, and precision current limit without external sense resistor. 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 MP2451DJ-LF-Z datasheet, MP2451DJ-LF-Z pinout, MP2451DJ-LF-Z application, or MP2451DJ-LF-Z equivalent, key selection criteria include its 3μA shutdown current for battery systems, 2MHz fixed-frequency operation enabling compact filter design, current-mode control for fast transient response, and TSOT23-6 package thermal performance (θJA = 220°C/W).
Technical Context
The MP2451DJ-LF-Z employs peak current-mode control with internal compensation, eliminating external loop components. Its PWM operation at 2MHz (±20%) ensures stable regulation under load steps up to 0.6A, while pulse-skipping mode reduces quiescent current to 130μA at light loads.
Bootstrap charging is managed via an internal regulator that maintains ~5V between BST and SW pins; the floating driver includes UVLO (2.4V rising threshold) and 20μA DC quiescent current. Thermal shutdown activates at 150°C with hysteresis to prevent cycling.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 3.3V to 36V - supports direct connection to automotive batteries (12V/24V) and industrial 24–36V rails without pre-regulation. |
| Switching Frequency | 2MHz (1600–2400kHz) - enables use of sub-4.7μH inductors and <10μF ceramic output capacitors for space-constrained designs. |
| Output Current | 0.6A continuous - sufficient for powering microcontrollers, sensors, and interface ICs in embedded systems. |
| Feedback Reference | 0.794V (typ) - sets output voltage via external resistor divider; tolerance ±2.5% ensures ≤±3% VOUT accuracy over line/load/temperature. |
| Shutdown Current | 3μA - extends battery life in always-on monitoring nodes and low-power IoT endpoints. |
| Quiescent Current | 130μA - maintains high efficiency down to ~1mA load, critical for energy-harvesting and coin-cell applications. |
| Internal MOSFET RDS(on) | 500mΩ - limits conduction loss at 0.6A to <180mW, reducing thermal stress in TSOT23-6 package. |
Pinout & Package
The MP2451DJ-LF-Z is housed in a thermally enhanced TSOT23-6 package (2.9mm × 1.6mm × 0.9mm), with exposed pad for improved heat dissipation and θJA = 220°C/W on 4-layer PCB per JESD51-7.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| BST | Bootstrap supply for high-side gate driver | Requires 0.1μF ceramic capacitor to SW; internal regulator charges it to ~5V-critical for MOSFET turn-on during high-duty-cycle operation. |
| GND | Power and signal ground reference | Must connect directly to output capacitor negative terminal and large copper pour to minimize noise coupling into FB and COMP nodes. |
| FB | Feedback input to error amplifier | Senses divided output voltage; internal 0.794V reference enables precise VOUT setting from 0.8V to 0.8×VIN using two resistors. |
| EN | Enable control input (active-high) | Threshold 1.55V (typ); internal pull-down ensures default disable; clamped at 7.5V to protect against overvoltage. |
| VIN | Main input power supply | Accepts 3.3–36V; requires local 4.7μF ceramic decoupling capacitor to suppress switching noise and sustain gate drive current. |
| SW | Switch node output | Connects to inductor and external Schottky diode cathode; high dv/dt node-must be routed short and away from FB/GND traces. |
Key Features
| Feature | Design Value |
|---|---|
| Internally compensated control loop | Eliminates need for external compensation network-reduces BOM count and layout sensitivity while maintaining ≥45° phase margin. |
| Precision cycle-by-cycle current limit | 1.0A (min) without external sense resistor-enables robust short-circuit protection and predictable current limiting across temperature. |
| Stable with ceramic output capacitors | Supports low-ESR MLCCs only-removes need for bulky tantalum/electrolytic caps, improving reliability and reducing board area. |
| Frequency fold-back at startup | Prevents inductor current runaway during soft-start by temporarily lowering switching frequency-ensures controlled VOUT ramp without overshoot. |
| Thermal shutdown with hysteresis | Triggers at 150°C junction temperature and releases at ~135°C-provides fault-tolerant operation without latch-up in sustained overload conditions. |
Applications
| Automotive Body Control Module | Industrial Sensor Node Power |
|---|---|
Use Scenario: Powering CAN transceivers, LIN drivers, and microcontrollers in door modules and seat controllers with 12V battery input. IC Role / Device Role / Timing Role: Primary 3.3V/5V buck regulator delivering regulated rail with <100mV ripple under 500mA dynamic load. Use Value: 36V absolute max rating withstands load-dump transients; 2MHz switching avoids AM radio band; TSOT23-6 fits tight connector zones. | Use Scenario: Supplying ultra-low-power RTOS-based sensor hubs (temperature, humidity, vibration) in factory automation equipment. IC Role / Device Role / Timing Role: Always-on 1.8V/2.5V supply with 3μA shutdown current extending 10-year battery life in wireless edge nodes. Use Value: 130μA quiescent current enables >90% efficiency at 100μA load; internal soft-start prevents brownout during cold-boot. |
| Distributed Telecom Power | Medical Portable Diagnostic Device |
Use Scenario: Local point-of-load conversion from 24V/48V backplane to 3.3V FPGA I/O banks and ADC reference rails in base station radios. IC Role / Device Role / Timing Role: Compact, high-efficiency secondary regulator with minimal external components and no external compensation. Use Value: 2MHz operation allows 2.2μH inductor and 10μF output cap-reducing solution size by 40% vs. 500kHz alternatives. | Use Scenario: Powering clinical-grade ECG front-end analog circuitry and Bluetooth LE SoC in handheld patient monitors. IC Role / Device Role / Timing Role: Low-noise 3.3V supply with <10mVpp ripple and fast load-step response (<10μs settling) for analog signal integrity. Use Value: Current-mode control delivers <5% output deviation under 100mA–500mA step; ceramic-cap stability eliminates ESR-related drift. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar step-down converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MP2451DT-LF-Z | SOT23-6 package (θJA = 220°C/W), identical electrical specs, same top marking ID but different product code (V7 vs AML) | Higher thermal resistance than TSOT23-6; less suitable for >0.4A continuous loads in sealed enclosures | Select when legacy SOT23-6 footprint compatibility is required or cost sensitivity outweighs thermal margin. |
| LMR14006XDDAR | 40V input, 600mA, 2.1MHz, but requires external compensation and current-sense resistor; higher IQ (40μA active) | Lacks integrated soft-start and bootstrap regulation-needs additional components for reliable startup and gate drive | Choose only if TI's WEBENCH support or dual-supply capability (bias rail option) is mandatory for system architecture. |
Compared with MP2451DT-LF-Z, the MP2451DJ-LF-Z offers superior thermal performance in the same footprint size, while the LMR14006XDDAR trades integration for flexibility in loop tuning-making the MP2451DJ-LF-Z optimal for space- and power-constrained designs requiring drop-in reliability.
Availability
MP2451DJ-LF-Z is available at Aetrix Electronics and suitable for automotive body electronics, industrial sensor nodes, distributed telecom power, and portable medical diagnostics requiring stable component supply, RoHS-compliant packaging, and long-term lifecycle assurance.
Supply support for MP2451DJ-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 core expertise in DC/DC conversion, motor drivers, and LED lighting controllers.
The MP2451 belongs to MPS's high-voltage buck converter product line, designed specifically for ruggedized 12V/24V/36V input environments where small size, low IQ, and transient robustness are critical-targeting automotive, industrial, and battery-powered applications.
FAQ
What is the minimum input voltage required for MP2451DJ-LF-Z to start switching?
The MP2451DJ-LF-Z has a VIN UVLO rising threshold of 2.9V (typical) with 0.4V hysteresis. It begins normal operation once VIN exceeds 2.9V and EN is pulled above 1.55V. Below 2.7V, the device remains latched in shutdown regardless of EN state.
Can MP2451DJ-LF-Z operate with a 5V input and 3.3V output at 600mA?
Yes-this is within specification. At VIN=5V, VOUT=3.3V, the duty cycle is ~66%, which is supported. Ensure BST-SW capacitor is ≥0.1μF and VIN–VOUT ≥3V (here, 1.7V) is insufficient for reliable bootstrap refresh at light load; use EN pin to raise UVLO or add external BST diode per datasheet Figure 2.
Does MP2451DJ-LF-Z require an external bootstrap diode?
No-bootstrap is fully internal. However, an external diode (e.g., BAT54) from a 5V rail to BST is recommended when VIN ≤5V, VOUT is 3.3–5V, or duty cycle exceeds 65%, as it improves gate drive strength and light-load stability by supplementing internal charging.
How does the MP2451DJ-LF-Z handle short-circuit conditions?
It uses cycle-by-cycle current limiting with 1.0A (min) threshold and internal thermal shutdown at 150°C. During sustained short, it enters hiccup mode-shutting down for ~500ms after thermal trip, then attempting restart-preventing damage while allowing automatic recovery when fault clears.
Is the feedback reference voltage trimmed at the factory?
Yes-the 0.794V (typ) reference is laser-trimmed during production. Electrical characteristics specify ±2.5% tolerance (0.778V to 0.810V at VIN >4.0V), ensuring accurate output regulation without calibration in end equipment.
What PCB layout practices are critical for stable MP2451DJ-LF-Z operation?
Minimize SW node loop area (VIN → SW → diode → GND → VIN), place 0.1μF ceramic bypass cap within 2mm of VIN/GND, route FB traces short and shielded from SW, connect GND pin to large copper pour, and avoid routing sensitive analog traces near SW or BST.
MP2451DJ-LF-Z Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Monolithic Power Systems Inc.
- Series:
- -
- Package/Case:
- SOT-23-6 Thin, TSOT-23-6
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- 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:
- TSOT-23-6
MP2451DJ-LF-Z FAQ
1.How can I place an order for MP2451DJ-LF-Z through Aetrix?
Please submit a Request for Quotation (RFQ) for MP2451DJ-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 MP2451DJ-LF-Z reliable?
The price and inventory of MP2451DJ-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 MP2451DJ-LF-Z is usually 5 days.
3.What payment methods are accepted for MP2451DJ-LF-Z?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MP2451DJ-LF-Z transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MP2451DJ-LF-Z?
MP2451DJ-LF-Z orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MP2451DJ-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 MP2451DJ-LF-Z?
For technical support, including MP2451DJ-LF-Z datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MP2451DJ-LF-Z requirements.
6.How does Aetrix verify that MP2451DJ-LF-Z is sourced from the original manufacturer or authorized distributors?
All MP2451DJ-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 MP2451DJ-LF-Z meets industry standards.
7.What is the process for return or replacement of MP2451DJ-LF-Z?
All MP2451DJ-LF-Z units undergo pre-shipment inspection (PSI). If there is an issue with MP2451DJ-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 MP2451DJ-LF-Z part is unused and in its original packaging.
Return procedure for MP2451DJ-LF-Z:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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