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Monolithic Power Systems Inc. MP2452DD-LF-P
- Part No.:
- MP2452DD-LF-P
- Manufacturer:
- Monolithic Power Systems Inc.
- Package:
- 8-TFDFN Exposed Pad
- Datasheet:
-
MP2452DD-LF-P.pdf
- Description:
- IC REG BUCK ADJ 1A 8QFN
- Quantity:
- Payment:
- Shipping:
Inventory:1,491
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Product details
Overview
MP2452DD-LF-P from Monolithic Power Systems is a 1A, 36V input, 1MHz non-synchronous step-down DC/DC converter with integrated 500mΩ high-side MOSFET, 0.794V feedback reference, and internal soft-start. It delivers up to 1A output current across a 3.3–36V input range and achieves >90% efficiency at 5V/1A with VIN=12V. Used in automotive power rails where wide VIN and low quiescent current are critical.
For engineers reviewing the MP2452DD-LF-P datasheet, MP2452DD-LF-P pinout, MP2452DD-LF-P application, or MP2452DD-LF-P equivalent, key selection criteria include its 3.3–36V operating range, 130µA no-load quiescent current, fixed 1MHz switching frequency, internal compensation, and QFN8 thermal performance under automotive transients.
Technical Context
The MP2452DD-LF-P employs peak-current-mode control with a fixed 1MHz oscillator and cycle-by-cycle current limiting. Its internal 0.794V reference sets output voltage via external resistor divider, and soft-start ramps FB reference from 0V over 0.5ms to prevent overshoot.
It operates in PWM mode at medium-to-heavy loads and transitions to pulse-skipping mode at light loads to maintain high efficiency-reducing switching and gate-drive losses while holding shutdown current to 3µA. Bootstrap charging relies on external BST capacitor between BST and SW pins, with UVLO protection on the floating driver.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 3.3V to 36V - supports direct connection to automotive battery (9–16V nominal) and industrial 24V/36V rails without pre-regulation. |
| Output Current | 1A continuous - sufficient for powering microcontrollers, sensors, and CAN transceivers in embedded systems. |
| Switching Frequency | Fixed 1MHz - enables compact magnetics (e.g., 6.8µH inductor) and reduces EMI filtering burden vs. lower-frequency converters. |
| Feedback Reference | 0.794V ±1.6% - allows precise output setting from 0.794V to 33V using standard resistor ratios; improves regulation accuracy vs. 1.25V references. |
| Quiescent Current | 130µA at no load - extends battery life in always-on vehicle modules (e.g., telematics, alarm systems). |
| Shutdown Current | 3µA - enables deep sleep states in battery-powered applications without external load switches. |
| Internal MOSFET RDS(on) | 500mΩ - reduces conduction loss at 1A; eliminates need for external high-voltage switch in cost-sensitive designs. |
Pinout & Package
MP2452DD-LF-P is housed in a thermally enhanced 2mm × 3mm QFN-8 package with exposed thermal pad (pin 6), optimized for PCB heat dissipation in space-constrained automotive and industrial modules.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 2 (BST) | Bootstrap supply | Provides gate drive voltage for internal high-side MOSFET; requires 0.1µF ceramic capacitor to SW to sustain operation above 65% duty cycle. |
| 4 (VIN) | Main input supply | Supplies internal regulator, logic, and gate drivers; must be decoupled with ≥4.7µF ceramic capacitor near pin to suppress switching noise. |
| 3 (SW) | Switch node | Drives external inductor; high di/dt path requiring short trace routing and proximity to freewheeling diode or synchronous rectifier. |
| 7 (FB) | Feedback input | Compares output voltage (via resistive divider) against 0.794V reference; sensitive analog node requiring shortest possible trace to ground. |
| 5 (EN) | Enable control | High-active logic input (1.2V threshold); floating defaults to disable; used for sequencing or system-level power management. |
| 6 (GND) | Ground / Exposed Pad | Primary return path for power and signal; exposed pad must be soldered to large PCB copper area for thermal and EMI performance. |
| 1, 8 (NC) | No connect | Unbonded die pads; must remain unconnected per datasheet to avoid latch-up or parametric shift. |
Key Features
| Feature | Design Value |
|---|---|
| Internally compensated | Eliminates external compensation components-reduces BOM count and layout sensitivity while maintaining ≥45° phase margin across 10–100µF output capacitance. |
| Ceramic-capacitor stable | Supports low-ESR ceramic output capacitors (≥10µF) without oscillation-enables smaller footprint and longer lifetime vs. electrolytic alternatives. |
| Frequency fold-back | Reduces switching frequency during startup to limit inrush current and prevent inductor saturation under heavy load conditions. |
| Thermal shutdown | Triggers at 150°C junction temperature and releases at ~135°C-provides fault-tolerant operation in sealed enclosures or high-ambient environments. |
| UVLO with hysteresis | 3.0V turn-on / 2.6V turn-off threshold-prevents erratic operation during cold-crank (e.g., 6V automotive start) and ensures clean power-up sequencing. |
Applications
| Automotive Body Control Module (BCM) | Industrial PLC I/O Power Rail |
|---|---|
|
Use Scenario: Powers MCU, CAN transceiver, and sensor interface in door module with 9–16V battery input and load dump immunity requirements. IC Role / Device Role / Timing Role: Primary 5V/1A buck regulator delivering stable rail despite cold-crank (6V) and load dump (40V) transients. Use Value: 36V absolute max rating and 3.3–36V operating range eliminate need for front-end TVS/clamp; 130µA quiescent current meets ISO 8859-3 standby current limits. |
Use Scenario: Generates isolated 3.3V rail for digital I/O circuitry in DIN-rail mounted programmable logic controller with 24V DC field supply. IC Role / Device Role / Timing Role: Non-isolated step-down converter supplying logic-level power to FPGA configuration memory and level-shifters. Use Value: Fixed 1MHz frequency enables use of small 4.7µH inductor; internal MOSFET simplifies design vs. controller+external FET solutions. |
| Battery-Powered Telematics Unit | Distributed Telecom Power System |
|
Use Scenario: Powers GPS receiver, cellular modem, and MCU in fleet-tracking device powered by 3.7V Li-ion with boost-buck backup. IC Role / Device Role / Timing Role: Secondary 3.3V buck stage accepting boosted 12V input; operates in pulse-skipping mode during GPS idle periods. Use Value: 3µA shutdown current extends battery runtime during multi-day sleep cycles; soft-start prevents voltage droop on shared battery rail. |
Use Scenario: Provides local 12V intermediate rail from 48V telecom backplane for fan controllers and monitoring ASICs. IC Role / Device Role / Timing Role: High-input-voltage buck converter handling 36–72V input range with transient tolerance per GR-1089. Use Value: 36V rated input (with 40V abs max) accommodates 48V nominal with margin; QFN8 package supports high-density board layouts in compact modules. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar step-down converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LMR36520RNXR | Synchronous 2A converter; 3–65V input; 1.2V reference; requires external compensation. | Better efficiency at light load due to synchronous rectification; higher output current capability. | Select when >1A output or <100µA light-load IQ is required; adds complexity with external loop compensation. |
| TPS54331DR | Nonsynchronous 3A converter; 3.5–28V input; 0.8V reference; external MOSFET required. | Higher current and lower VIN limit; lacks integrated high-side FET and bootstrap circuitry. | Choose when 28V max input suffices and discrete FET optimization is needed; increases component count and layout effort. |
Compared with LMR36520RNXR and TPS54331DR, MP2452DD-LF-P offers optimal balance of integration (integrated 500mΩ FET, BST driver, soft-start), ultra-low shutdown current (3µA), and 36V operation-making it ideal for cost-sensitive, space-constrained automotive and industrial 1A rails where simplicity and reliability outweigh peak efficiency demands.
Availability
MP2452DD-LF-P is available at Aetrix Electronics and suitable for automotive body electronics, industrial PLC power supplies, and battery-backed telematics requiring stable component supply across extended temperature and long-lifecycle programs.
Supply support for MP2452DD-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 MP2452 belongs to MPS's high-voltage buck converter product line, designed specifically for automotive and industrial applications demanding wide input range, low IQ, and robust thermal performance in compact QFN packages.
FAQ
What is the minimum input voltage required for MP2452DD-LF-P to start switching?
The MP2452DD-LF-P has an under-voltage lockout (UVLO) rising threshold of 3.0V. It begins normal operation only when VIN exceeds this value. Below 2.6V, the device remains fully disabled. This ensures reliable startup after automotive cold-crank events where battery voltage may dip to 6V but not below 3V.
Can MP2452DD-LF-P operate with a 5V input and 3.3V output at 1A?
Yes-it supports 3.3V to 36V input and adjustable output down to 0.794V. At VIN=5V and VOUT=3.3V, duty cycle is ~66%, well within safe operating range. Ensure BST capacitor is properly sized (≥0.1µF) and that VIN–VOUT ≥3V to maintain bootstrap charge under light load.
Is an external bootstrap diode required for reliable operation?
An external bootstrap diode (e.g., BAT54) is recommended when VIN ≤5V, VOUT is 3.3–5V, or duty cycle exceeds 65%. It improves gate drive stability by sourcing BST voltage from a clean 5V rail instead of relying solely on the SW node, especially during pulse-skipping mode.
How does the MP2452DD-LF-P handle short-circuit conditions?
It uses cycle-by-cycle current limiting with a typical 1.5A peak switch current threshold. During sustained short, it enters hiccup mode-shutting down for ~500µs after current limit triggers, then attempting restart. Thermal shutdown activates if junction temperature exceeds 150°C.
What is the maximum allowable output voltage when using the internal 0.794V reference?
The datasheet specifies +0.794V to +33V output range. With R1 = 124kΩ and R2 = 1kΩ, VOUT = 0.794 × (1 + 124k/1k) = 99.2V-however, practical limit is constrained by external component voltage ratings and the 40V absolute maximum SW pin rating. Do not exceed 33V per specification.
Does MP2452DD-LF-P require external compensation components?
No-it is internally compensated and stable with ceramic output capacitors ≥10µF. External compensation is unnecessary unless custom loop response (e.g., faster transient recovery) is required, in which case R2/C3 values from Table 3 in the datasheet apply.
What PCB layout practices are critical for thermal performance?
Connect the exposed thermal pad (pin 6/GND) to a ≥100mm² internal or bottom-layer copper pour with ≥6 thermal vias (0.3mm diameter). Route VIN, SW, and GND traces wide and short; place input capacitor within 3mm of VIN/GND pins; isolate FB trace from noisy SW node.
MP2452DD-LF-P Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Monolithic Power Systems Inc.
- Series:
- -
- Package/Case:
- 8-TFDFN Exposed Pad
- 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):
- 0.794V
- Voltage - Output (Max):
- 33V
- Current - Output:
- 1A
- Frequency - Switching:
- 1MHz
- Synchronous Rectifier:
- No
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-QFN (2x3)
MP2452DD-LF-P FAQ
1.How can I place an order for MP2452DD-LF-P through Aetrix?
Please submit a Request for Quotation (RFQ) for MP2452DD-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 MP2452DD-LF-P reliable?
The price and inventory of MP2452DD-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 MP2452DD-LF-P is usually 5 days.
3.What payment methods are accepted for MP2452DD-LF-P?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MP2452DD-LF-P transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MP2452DD-LF-P?
MP2452DD-LF-P orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MP2452DD-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 MP2452DD-LF-P?
For technical support, including MP2452DD-LF-P datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MP2452DD-LF-P requirements.
6.How does Aetrix verify that MP2452DD-LF-P is sourced from the original manufacturer or authorized distributors?
All MP2452DD-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 MP2452DD-LF-P meets industry standards.
7.What is the process for return or replacement of MP2452DD-LF-P?
All MP2452DD-LF-P units undergo pre-shipment inspection (PSI). If there is an issue with MP2452DD-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 MP2452DD-LF-P part is unused and in its original packaging.
Return procedure for MP2452DD-LF-P:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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