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Monolithic Power Systems Inc. MP2451DJ-LF-P
- Part No.:
- MP2451DJ-LF-P
- Manufacturer:
- Monolithic Power Systems Inc.
- Package:
- SOT-23-6 Thin, TSOT-23-6
- Datasheet:
-
MP2451DJ-LF-P.pdf
- Description:
- IC REG BUCK ADJ 600MA TSOT23-6
- Quantity:
- Payment:
- Shipping:
Inventory:560
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Product details
Overview
MP2451DJ-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, 3.3–36V input range, and 0.8V feedback reference-designed for automotive power rails, industrial sensors, and battery-powered telemetry systems.
For engineers reviewing the MP2451DJ-LF-P datasheet, MP2451DJ-LF-P pinout, MP2451DJ-LF-P application, or MP2451DJ-LF-P equivalent, key selection criteria include its 3μA shutdown current, internal soft-start, pulse-skipping light-load mode, and TSOT23-6 thermal performance (θJA = 220°C/W).
Technical Context
The MP2451DJ-LF-P employs peak current-mode control with fixed 2MHz switching frequency and internal compensation, enabling stable regulation without external loop components. Its current-limit threshold is precision-set at 1.0A cycle-by-cycle, independent of external sensing resistors.
Operation includes frequency fold-back during start-up to prevent inductor current runaway, and a dedicated bootstrap regulator that maintains ~5V gate drive between BST and SW pins. Thermal shutdown activates at 150°C with hysteresis to ensure fault-tolerant recovery.
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. |
| Output Current | 0.6A continuous - sufficient for powering microcontrollers, CAN transceivers, and analog front-ends in compact embedded systems. |
| Switching Frequency | 2MHz (±20%) - enables use of small 2.2–3.3µH inductors and reduces EMI filter size in space-constrained designs. |
| Feedback Reference | 0.794V (typ) - sets output voltage via external resistor divider; allows adjustable outputs from 0.8V up to 0.8×VIN with ±1.5% accuracy. |
| Quiescent Current | 130µA (no load) - minimizes standby power loss in always-on IoT nodes and remote sensors. |
| Shutdown Current | 3µA - extends battery life in sleep-mode applications such as GPS trackers and wireless sensor nodes. |
| Internal MOSFET RDS(on) | 500mΩ - reduces conduction loss at 0.6A load, supporting >90% efficiency at mid-load across 5–12V output configurations. |
Pinout & Package
MP2451DJ-LF-P is housed in a thermally enhanced TSOT23-6 package (1.7mm × 2.9mm × 0.9mm), optimized for high-power density and improved heat dissipation over standard SOT23-6. Pin 1 is bottom-left when viewing top marking left-to-right.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| BST | Bootstrap supply | Provides floating gate drive for internal high-side MOSFET; requires 0.1µF ceramic capacitor between BST and SW to sustain 5V gate bias during high-duty-cycle operation. |
| GND | Power ground | Main return path for switch current and control circuitry; must connect directly to output capacitor ground plane to minimize noise coupling into FB. |
| FB | Feedback input | Compares divided output voltage against 0.794V internal reference; sets regulation point and anchors compensation network (R1/C3) for loop stability. |
| EN | Enable control | Active-high logic input (1.55V typ threshold); floating defaults to disable; internal 7.5V clamp allows direct VIN connection via high-value resistor for simple UVLO programming. |
| VIN | Input supply | Primary power source for control circuitry and high-side switch; requires local 4.7µF ceramic decoupling to suppress switching transients. |
| SW | Switch node | Drain of internal MOSFET; connects to inductor and external Schottky diode cathode; high dv/dt node requiring tight layout to reduce EMI and bootstrap charging losses. |
Key Features
| Feature | Design Value |
|---|---|
| Pulse-skipping light-load mode | Reduces quiescent current to 130µA and eliminates audible switching noise by gating clock pulses when COMP voltage falls below sleep threshold. |
| Internally compensated control loop | Eliminates need for external compensation components; supports stable operation with ceramic output capacitors ≥10µF and inductors 2.2–4.7µH. |
| Precision cycle-by-cycle current limit | 1.0A threshold with no external sense resistor - ensures consistent overcurrent protection across temperature and input voltage variations. |
| Internal soft-start | 0.5ms ramp time from 0V to 1.8V on FB node - prevents output overshoot and inrush current during cold start in battery-fed systems. |
| Thermal shutdown with hysteresis | Shuts down at 150°C junction temperature and re-enables at ~135°C - protects against sustained overload or poor PCB heatsinking without oscillatory latch-up. |
Applications
| Automotive Body Control Module | Industrial Sensor Node |
|---|---|
Use Scenario: Powering LIN transceivers, door lock actuators, and ambient light sensors from a 12V vehicle battery with stop-start capability. IC Role / Device Role / Timing Role: Primary 3.3V/5V buck regulator delivering regulated supply to MCU and peripherals under wide input transients (4V–36V). Use Value: 3μA shutdown current preserves battery charge during vehicle sleep mode; 2MHz switching avoids AM radio band interference. | Use Scenario: Providing 3.3V rail for low-power RTU in remote water metering or environmental monitoring equipment powered by LiSOCl₂ primary cells. IC Role / Device Role / Timing Role: High-efficiency step-down converter operating in pulse-skipping mode during 99%+ duty-cycle sleep intervals. Use Value: 130µA operating IQ extends 10-year battery life; internal soft-start prevents voltage droop during wake-up bursts. |
| Distributed Power Architecture | Telematics Tracking Unit |
Use Scenario: Local point-of-load conversion in programmable logic controllers where 24V backplane supplies multiple isolated 5V/3.3V rails. IC Role / Device Role / Timing Role: Compact, self-contained buck stage replacing discrete FET + controller solutions in DIN-rail mounted enclosures. Use Value: TSOT23-6 footprint saves board area vs. SO-8 alternatives; 500mΩ RDS(on) sustains >90% efficiency at 0.4A load without heatsink. | Use Scenario: Power management for GPS/GSM modules in asset trackers exposed to automotive temperature extremes (−40°C to +105°C ambient). IC Role / Device Role / Timing Role: Main DC/DC regulator supplying 3.3V to GNSS receiver and cellular modem under varying input (9–32V) and load conditions. Use Value: −40°C to +125°C junction rating ensures reliability in engine bay mounting; frequency fold-back prevents startup current surge into large output caps. |
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 same, but lower thermal mass); identical electrical specs and pinout. | Preferred for manual assembly or prototyping due to larger pad pitch; less suitable for high-density automotive PCBs. | Select when thermal margin is adequate and board real estate permits larger footprint. |
| LMR14006XDDAR | 40V input, 0.6A, 2.1MHz, but requires external compensation and current-sense resistor; higher 75µA IQ in skip mode. | Supports wider VIN (6–40V) and offers adjustable frequency; lacks internal soft-start and bootstrap regulation. | Choose only if design requires programmable frequency or compatibility with TI's WEBENCH toolchain. |
Compared with MP2451DJ-LF-P, the MP2451DT-LF-Z offers identical functionality in a more manufacturable package, while the LMR14006XDDAR trades integration for flexibility-making the MP2451DJ-LF-P optimal for space- and efficiency-critical automotive and industrial applications.
Availability
MP2451DJ-LF-P is available at Aetrix Electronics and suitable for automotive body electronics, industrial sensor nodes, distributed power systems, and telematics tracking units requiring stable component supply across extended temperature and lifecycle demands.
Supply support for MP2451DJ-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, motor drivers, and LED lighting controllers.
The MP2451 product line targets cost-sensitive, high-reliability embedded power applications-specifically engineered for automotive-grade input ranges, low-IQ operation, and minimal external component count in space-constrained environments.
FAQ
What is the maximum recommended output current for MP2451DJ-LF-P at 85°C ambient?
The MP2451DJ-LF-P delivers 0.6A continuous output at TA = 25°C with proper PCB copper area. At 85°C ambient, derating applies: with 2-layer board and 1-in² 2oz copper pour under GND pin, max continuous output drops to 0.42A due to thermal resistance (θJA = 220°C/W) limiting junction temperature to 125°C.
Can MP2451DJ-LF-P operate with a 3.3V input supply?
Yes-MP2451DJ-LF-P supports VIN as low as 3.3V per datasheet specifications. However, at 3.3V input, the maximum achievable output is 2.64V (0.8×VIN), and bootstrap charging becomes marginal; an external 5V BST diode (e.g., BAT54) is recommended to maintain gate drive integrity.
Does MP2451DJ-LF-P require an external Schottky diode?
Yes-MP2451DJ-LF-P is a non-synchronous buck converter and requires an external Schottky diode (e.g., SS14, 40V/1A) connected from SW to GND. The diode must be placed adjacent to the SW pin to minimize parasitic inductance and reduce voltage spikes during turn-off.
How does the internal soft-start interact with short-circuit recovery?
During short-circuit recovery, the internal soft-start voltage (SS) tracks the FB pin voltage. When the short is removed, SS ramps up from the instantaneous FB level-not from zero-enabling controlled re-establishment of regulation without output overshoot, unlike conventional fixed-ramp soft-start schemes.
Is the FB pin internally clamped, and what is its absolute maximum voltage?
The FB pin has no internal clamp and is rated for −0.3V to 5.0V per Absolute Maximum Ratings. Exceeding 5.0V risks damage; external overvoltage protection (e.g., Zener diode to GND) is required if feedback divider is exposed to transient surges or hot-plug events.
What is the minimum inductor value recommended for 2MHz operation?
For stable 2MHz operation with ≤30% peak-to-peak inductor ripple current at 0.6A load, the minimum recommended inductance is 2.2µH (e.g., Wurth 7440430022). Lower values risk subharmonic oscillation and reduced phase margin; values <1.5µH are not characterized or guaranteed.
MP2451DJ-LF-P 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-P FAQ
1.How can I place an order for MP2451DJ-LF-P through Aetrix?
Please submit a Request for Quotation (RFQ) for MP2451DJ-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 MP2451DJ-LF-P reliable?
The price and inventory of MP2451DJ-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 MP2451DJ-LF-P is usually 5 days.
3.What payment methods are accepted for MP2451DJ-LF-P?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MP2451DJ-LF-P transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MP2451DJ-LF-P?
MP2451DJ-LF-P orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MP2451DJ-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 MP2451DJ-LF-P?
For technical support, including MP2451DJ-LF-P datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MP2451DJ-LF-P requirements.
6.How does Aetrix verify that MP2451DJ-LF-P is sourced from the original manufacturer or authorized distributors?
All MP2451DJ-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 MP2451DJ-LF-P meets industry standards.
7.What is the process for return or replacement of MP2451DJ-LF-P?
All MP2451DJ-LF-P units undergo pre-shipment inspection (PSI). If there is an issue with MP2451DJ-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 MP2451DJ-LF-P part is unused and in its original packaging.
Return procedure for MP2451DJ-LF-P:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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