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Monolithic Power Systems Inc. MP2451DT-LF-Z
- Part No.:
- MP2451DT-LF-Z
- Manufacturer:
- Monolithic Power Systems Inc.
- Package:
- SOT-23-6
- Datasheet:
-
MP2451DT-LF-Z.pdf
- Description:
- IC REG BUCK ADJ 600MA SOT23-6
- Quantity:
- Payment:
- Shipping:
Inventory:7,370
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Product details
Overview
MP2451DT-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-designed for automotive input environments (3.3V–36V), battery-powered systems, and industrial power rails requiring >90% efficiency and 3μA shutdown current.
For engineers reviewing the MP2451DT-LF-Z datasheet, MP2451DT-LF-Z pinout, MP2451DT-LF-Z application, or MP2451DT-LF-Z equivalent, this page delivers verified technical context, validated pin functions, real-world application cards, and confirmed alternative parts with documented functional differences-not generic timing or power device summaries.
Technical Context
The MP2451DT-LF-Z implements fixed-frequency (2MHz) peak-current-mode control with internal compensation and frequency fold-back during start-up to prevent inductor current runaway. Its current-mode architecture enables fast transient response and stable operation with ceramic output capacitors without external compensation networks.
It features a dedicated bootstrap driver powered by an external BST-SW capacitor, internal 0.794V feedback reference, and EN pin with 1.55V enable threshold and 7.5V clamping-supporting both logic-controlled enable and VIN-derived enable via high-ohm resistor. Thermal shutdown at 150°C and UVLO with 2.9V rising threshold ensure fault-tolerant operation across automotive temperature range (−40°C to +125°C).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 3.3V to 36V - supports direct connection to automotive battery (cold-crank down to 3.3V) and industrial 24V rails. |
| Output Current | 0.6A continuous - sufficient for powering microcontrollers, sensors, and interface ICs in compact systems. |
| Switching Frequency | 2MHz (±20%) - enables use of small inductors (e.g., 3.3µH) and reduces EMI filtering burden. |
| Feedback Reference | 0.794V (typ) - sets output voltage via external resistor divider; enables adjustable VOUT from 0.8V to 0.8×VIN. |
| Quiescent Current | 130μA (no load) - minimizes standby power loss in always-on battery systems. |
| Shutdown Current | 3μA - extends battery life in sleep-mode applications such as telematics or remote sensors. |
| Internal MOSFET RDS(on) | 500mΩ - eliminates need for external high-voltage switch; simplifies BOM and layout. |
| Thermal Shutdown | 150°C - protects against thermal runaway under overload or poor PCB heatsinking. |
Pinout & Package
The MP2451DT-LF-Z is housed in a RoHS-compliant SOT23-6 package (3.0mm × 2.8mm × 1.3mm), optimized for high-density PCB layouts and thermally constrained spaces. Pin 1 is bottom-left when viewing top marking left-to-right.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| BST | Bootstrap supply for high-side gate driver | Requires 0.1μF ceramic capacitor between BST and SW to sustain gate drive voltage during high-duty-cycle operation. |
| GND | Power and signal ground reference | Must connect directly to output capacitor ground plane-avoid shared traces with switching currents to prevent noise coupling. |
| FB | Feedback input to error amplifier | Compares divided output voltage against 0.794V internal reference; sets regulation point via RUP/RDN divider. |
| EN | Enable control input (active-high) | Logic-compatible input with 1.55V threshold; floating defaults to disable; clamped at 7.5V for overvoltage protection. |
| VIN | Main input supply (3.3–36V) | Supplies internal regulator, gate drivers, and control circuitry; requires local 4.7μF ceramic decoupling. |
| 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. |
Key Features
| Feature | Design Value |
|---|---|
| Internally compensated control loop | Eliminates need for external compensation components-reduces design time and component count while maintaining ≥45° phase margin. |
| Precision cycle-by-cycle current limit | 1.0A typical limit without external sense resistor-enables robust short-circuit protection and predictable overload behavior. |
| Frequency fold-back at light load | Reduces switching losses below 100mA load by lowering fSW, improving efficiency without pulse-skipping noise artifacts. |
| Stable with ceramic output capacitors | Supports low-ESR MLCCs (e.g., 10μF X5R) - avoids bulkier tantalum/electrolytic caps and improves reliability in wide-temp environments. |
| Internal soft-start (0.5ms) | Prevents output overshoot during startup and controls inrush current into downstream capacitance-critical for systems with sensitive loads. |
Applications
| Automotive Infotainment Power | Industrial Sensor Node Supply |
|---|---|
Use Scenario: Powers display controller, audio codec, and CAN transceiver in 12V vehicle infotainment head unit with cold-crank resilience. IC Role / Device Role / Timing Role: Primary 3.3V/0.6A buck regulator delivering regulated rail from unregulated 9–16V battery input. Use Value: 2MHz switching allows <3mm² solution size; 3.3V–36V input handles load-dump transients up to 36V; 3μA shutdown preserves battery during ignition-off. | Use Scenario: Supplies ultra-low-power MCU, analog front-end, and LoRa transceiver in battery-operated factory-floor vibration sensor. IC Role / Device Role / Timing Role: Standby-optimized DC/DC converter enabling multi-year battery life via 130μA quiescent current and programmable enable sequencing. Use Value: Internal current limit prevents damage during sensor short-circuit events; ceramic-capacitor stability ensures reliable operation in wide-temperature industrial enclosures. |
| Distributed Telecom Power | Medical Portable Diagnostic Module |
Use Scenario: Generates isolated 5V rail for FPGA I/O banks and ADC drivers in modular telecom base station card with 24V backplane input. IC Role / Device Role / Timing Role: Point-of-load (POL) regulator converting 24V intermediate bus to clean 5V supply with minimal board area. Use Value: 500mΩ MOSFET and 2MHz operation reduce conduction/switching losses-achieving >90% efficiency at 0.4A load without heatsink. | Use Scenario: Provides regulated 1.2V core voltage for ARM Cortex-M7 processor and 3.3V for clinical-grade analog signal chain in handheld ultrasound probe. IC Role / Device Role / Timing Role: Dual-rail power source supporting low-noise analog section and digital processing subsystem with tight voltage tolerance. Use Value: 0.794V reference accuracy (±2.5%) and internal soft-start ensure precise 1.2V output with <1% deviation; RoHS/halogen-free construction meets medical safety standards. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar step-down converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MP2451DJ-LF-Z | Identical electrical specs but TSOT23-6 package (0.95mm height vs. SOT23-6's 1.3mm); same pinout and thermal resistance (θJA=220°C/W). | Better suited for ultra-thin assemblies where Z-height <1.0mm is mandatory; slightly higher assembly cost. | Select DJ variant only when mechanical envelope constraints require lower profile-no electrical trade-offs. |
| LMR14006XDDAR | TI part: 40V input, 0.6A, 2.1MHz, but requires external compensation and sense resistor; 150μA IQ, no BST pin-uses integrated boot diode. | Needs additional components (R/C network, current sense R); less suitable for space-constrained or ultra-low-BOM designs. | Choose LMR14006 only if TI ecosystem alignment or specific qualification requirements override integration benefits of MP2451. |
Compared with MP2451DJ-LF-Z, the DT variant offers identical performance in a taller but more widely supported SOT23-6 footprint; versus LMR14006XDDAR, MP2451DT-LF-Z delivers higher integration (no external sense R or compensation), lower solution size, and superior light-load efficiency via frequency fold-back.
Availability
MP2451DT-LF-Z is available at Aetrix Electronics and suitable for automotive infotainment, industrial sensor nodes, and distributed telecom power systems requiring stable component supply, long-term lifecycle support, and RoHS-compliant sourcing.
Supply support for MP2451DT-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, and global manufacturing partnerships.
The MP2451 belongs to MPS's high-voltage DC/DC converter product line, engineered specifically for automotive, industrial, and battery-powered applications demanding wide-input-range operation, high efficiency at light load, and robust fault protection.
FAQ
What is the minimum input voltage required for MP2451DT-LF-Z to start switching?
The MP2451DT-LF-Z has a VIN UVLO rising threshold of 2.9V (typical), meaning it begins switching once input voltage exceeds approximately 2.9V. However, stable regulation requires VIN ≥ 3.3V per datasheet operating conditions-below that, output may not reach target voltage due to reduced internal regulator headroom.
Can MP2451DT-LF-Z operate without an external bootstrap capacitor?
No. The BST pin requires a 0.1μF ceramic capacitor connected between BST and SW to charge the floating gate driver. Omitting it disables high-side MOSFET turn-on, causing complete failure of regulation. This capacitor must be placed adjacent to the IC with short, low-inductance traces.
How does the MP2451DT-LF-Z achieve >90% efficiency at full load?
It achieves >90% efficiency through three key mechanisms: (1) low 500mΩ RDS(on) minimizes conduction loss; (2) 2MHz fixed-frequency operation reduces magnetic component size and associated core loss; and (3) optimized gate drive and frequency fold-back at light load cut switching/gate-driving losses-verified across 12V→3.3V/0.6A test conditions.
Is the FB pin internally referenced to a precise voltage?
Yes. The FB pin compares against an internal 0.794V (typical) bandgap reference with ±2.5% tolerance over temperature and line. This reference is trimmed during wafer test and enables accurate output voltage setting using standard 1% resistors in the feedback divider.
What happens to the SW pin during thermal shutdown?
During thermal shutdown, the internal control logic disables the high-side MOSFET, forcing SW to float near GND (via external freewheeling diode). The chip stops switching entirely-COMP voltage drops, FB is ignored, and EN remains functional-allowing automatic recovery once die temperature falls below the hysteresis threshold (~135°C).
Does MP2451DT-LF-Z support output voltages below 0.8V?
No. The internal feedback reference is fixed at 0.794V (min 0.778V), and the datasheet specifies VOUT = 0.8V to 0.8×VIN. Attempting sub-0.8V outputs violates regulation accuracy and may cause instability-designs requiring <0.8V should select a different converter with adjustable reference or external error amplifier.
Why is the EN pin clamped at 7.5V?
The EN pin integrates a zener diode to GND with 7.5V clamping voltage, protecting the internal enable comparator from overvoltage during system-level transients or miswiring. This allows safe connection of EN directly to 5V logic rails or VIN via high-value resistors without external protection components.
MP2451DT-LF-Z 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-Z FAQ
1.How can I place an order for MP2451DT-LF-Z through Aetrix?
Please submit a Request for Quotation (RFQ) for MP2451DT-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 MP2451DT-LF-Z reliable?
The price and inventory of MP2451DT-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 MP2451DT-LF-Z is usually 5 days.
3.What payment methods are accepted for MP2451DT-LF-Z?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MP2451DT-LF-Z transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MP2451DT-LF-Z?
MP2451DT-LF-Z orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MP2451DT-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 MP2451DT-LF-Z?
For technical support, including MP2451DT-LF-Z datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MP2451DT-LF-Z requirements.
6.How does Aetrix verify that MP2451DT-LF-Z is sourced from the original manufacturer or authorized distributors?
All MP2451DT-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 MP2451DT-LF-Z meets industry standards.
7.What is the process for return or replacement of MP2451DT-LF-Z?
All MP2451DT-LF-Z units undergo pre-shipment inspection (PSI). If there is an issue with MP2451DT-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 MP2451DT-LF-Z part is unused and in its original packaging.
Return procedure for MP2451DT-LF-Z:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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