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Monolithic Power Systems Inc. MP24943DS-LF-P
- Part No.:
- MP24943DS-LF-P
- Manufacturer:
- Monolithic Power Systems Inc.
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
MP24943DS-LF-P.pdf
- Description:
- IC REG BUCK ADJ 3A 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:3,973
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Product details
Overview
MP24943DS-LF-P from Monolithic Power Systems is a monolithic 3A, 55V, 100kHz step-down DC-DC converter with programmable output over-voltage protection (OVP), fixed-frequency current-mode control, and integrated 0.15Ω high-side MOSFET. It operates from 4.5V to 55V input, delivers adjustable output from 0.8V to 45V, and targets automotive GPS and entertainment power supplies where wide VIN and robust fault protection are required.
For engineers reviewing the MP24943DS-LF-P datasheet, MP24943DS-LF-P pinout, MP24943DS-LF-P application, or MP24943DS-LF-P equivalent, key selection criteria include its programmable OVP threshold (0.9V reference on VO pin), SOIC8E package with exposed thermal pad, cycle-by-cycle current limit (6.5A typ), thermal shutdown (150°C), and compatibility with low-ESR ceramic output capacitors.
Technical Context
The MP24943DS-LF-P implements a current-mode buck architecture with a fixed 100kHz oscillator, slope-compensated peak-current sensing, and an error amplifier referenced to a precise 0.80V FB voltage. Its control loop uses external resistor dividers for both output regulation (FB) and OVP threshold setting (VO).
It integrates a bootstrap gate driver with internal charge pump for high-side switch operation, supports soft-start via external capacitor on SS pin, and features enable logic with 1.8V turn-on/0.4V turn-off thresholds. Fault handling includes automatic OVP latch-off with soft-start discharge and thermal shutdown with hysteresis.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 4.5V to 55V - supports 12V/24V/48V automotive and industrial rails without pre-regulation. |
| Output Current | 3A continuous - sufficient for powering GPS modules, infotainment SoCs, or linear charger front-ends. |
| Switch RDS(ON) | 0.15Ω max - reduces conduction loss at full load; enables high efficiency (>90% typical at 12VIN/5VOUT). |
| Feedback Reference | 0.80V ±2% - sets output voltage accuracy; enables precise regulation with standard resistor tolerances. |
| OVP Reference | 0.90V ±4% on VO pin - allows programmable over-voltage trip point (e.g., 6V with R5/R6 divider) for system-level safety. |
| Switching Frequency | 100kHz fixed - simplifies EMI filtering design and avoids AM band interference; enables use of cost-effective inductors. |
| Thermal Shutdown | 150°C junction - protects die during overload or poor PCB thermal layout; recovers after cooldown. |
Pinout & Package
MP24943DS-LF-P is supplied in SOIC8E package with exposed thermal pad on underside, requiring connection to GND plane for optimal thermal performance (θJA = 50°C/W). Pin 2 (GND) and the exposed pad must be tied together in layout.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN (Pin 1) | Unregulated input supply | Accepts 4.5–55V; requires local 4.7μF+ ceramic decoupling; powers internal circuitry and high-side switch drain. |
| GND (Pin 2) | Power and signal ground reference | Reference for FB, EN, VO, SS; exposed pad must be soldered to GND plane for thermal and noise control. |
| EN (Pin 3) | Enable control input | Logic-level interface: >1.8V enables regulator; <0.4V disables; internal pull-down ensures default-off state. |
| FB (Pin 4) | Feedback node | Monitors output via resistor divider; regulates VOUT to 0.80V; sets loop bandwidth with R1/CCOMP. |
| SS (Pin 5) | Soft-start timing | Connects to external capacitor; controls output ramp rate to limit inrush current and prevent overshoot. |
| VO (Pin 6) | OVP sense input | Monitors scaled VOUT; trips if voltage exceeds 0.90V reference; forces shutdown and discharges SS cap. |
| BST (Pin 7) | Bootstrap supply | Connects to SW via 0.1μF ceramic; provides floating gate drive voltage for high-side MOSFET; optional diode improves reliability at high duty cycles. |
| SW (Pin 8) | Switch node | Drives external inductor; carries high di/dt; must be routed short and away from sensitive analog nodes (FB, VO, SS). |
Key Features
| Feature | Design Value |
|---|---|
| Programmable Output OVP | Configurable trip point via external resistor divider on VO pin; prevents downstream damage from regulator failure or feedback fault. |
| Low-ESR Ceramic Output Cap Support | Stable with X5R/X7R ceramics; eliminates need for electrolytic capacitors, improving lifetime and reducing board area. |
| Integrated 0.15Ω High-Side MOSFET | Reduces BOM count and layout complexity; eliminates external switch and driver; optimized for 100kHz switching. |
| Cycle-by-Cycle Current Limit | 6.5A typical current limit; protects against short-circuit and overload without external sensing components. |
| Low EMI Switching Edges | Controlled slew rates on SW node reduce conducted and radiated emissions; simplifies compliance with CISPR 25 Class 5. |
Applications
| Automotive GPS Module Power | Automotive Infotainment Display Supply |
|---|---|
Use Scenario: Powers GPS receiver ICs (e.g., u-blox MAX-M8Q) in vehicle navigation systems with 12V battery input subject to load dump transients. IC Role / Device Role / Timing Role: Primary 3.3V/5V buck regulator; handles input transients up to 55V; provides stable rail under engine cranking (5.5V min). Use Value: Programmable OVP prevents damage to GPS RF front-end during feedback resistor failure; SOIC8E thermal pad sustains 3A load in confined dashboard space. | Use Scenario: Supplies LCD backlight drivers and audio amplifiers in head-unit displays operating from 24V truck battery systems. IC Role / Device Role / Timing Role: Intermediate 12V buck stage feeding downstream LDOs; withstands cold-crank (4.5V) and ISO 7637-2 pulse 5a (75V surge). Use Value: Fixed 100kHz frequency enables predictable EMI filter design; low EMI signature meets stringent automotive EMC requirements. |
| Linear Charger Front-End | Industrial 24V-to-5V Conversion |
Use Scenario: Generates clean 5V rail for USB-powered linear battery chargers (e.g., TI BQ2407x) in portable diagnostic tools. IC Role / Device Role / Timing Role: Pre-regulator stepping down 12–24V vehicle power to 5V before linear charger; minimizes heat dissipation in linear stage. Use Value: 0.80V FB reference enables tight 5V tolerance (±1%) critical for USB compliance; soft-start prevents inrush into large input caps of charger IC. | Use Scenario: Powers microcontroller-based PLC I/O modules from 24V industrial bus with strict thermal constraints. IC Role / Device Role / Timing Role: Main 5V/3.3V system supply; operates continuously at 65°C ambient; requires reliable thermal management. Use Value: Exposed pad SOIC8E package achieves 2.5W power dissipation; thermal shutdown + auto-restart ensures graceful degradation during overload. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar step-down converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM5164QPWPRQ1 | 4.5–65V input, 1A output, 1MHz switching, no integrated OVP; requires external OVP circuit. | Higher frequency enables smaller magnetics but increases EMI risk; lacks built-in OVP, increasing BOM and validation effort. | Select when size is critical and OVP can be implemented externally; avoid when functional safety or reduced component count is prioritized. |
| TPS54360BDDAR | 3.5–60V input, 3.5A output, 100kHz/2.2MHz selectable, no programmable OVP; uses external FET. | Higher current rating but requires external MOSFET and driver; OVP must be added with comparator and reference. | Select only if higher peak current or design flexibility outweighs increased layout complexity and BOM cost. |
Compared with LM5164QPWPRQ1 and TPS54360BDDAR, MP24943DS-LF-P offers integrated OVP, single-chip 3A solution, and SOIC8E thermal performance-reducing design time, bill-of-materials, and validation scope for automotive and industrial 12–55V systems.
Availability
MP24943DS-LF-P is available at Aetrix Electronics and suitable for automotive GPS modules, infotainment display supplies, and linear charger front-ends requiring stable component supply across extended temperature and voltage ranges.
Supply support for MP24943DS-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 MP24943 belongs to MPS's automotive-grade buck converter product line, designed specifically for harsh-environment applications demanding wide input range, integrated protection, and AEC-Q100 stress qualification readiness.
FAQ
What is the maximum recommended output voltage for MP24943DS-LF-P?
The MP24943DS-LF-P supports output voltages up to 45V, set by the external resistor divider on the FB pin. This limit is enforced by internal design margins and absolute maximum ratings-exceeding 45V risks violating the VO pin's 6.5V absolute max rating when scaling VOUT for OVP.
Can MP24943DS-LF-P operate with a 3.3V input?
No. The minimum operating input voltage is 4.5V, defined by the under-voltage lockout (UVLO) rising threshold of 3.3V ±0.3V and required headroom for internal bias generation. At 3.3V, the device remains in shutdown and will not start.
Is an external bootstrap diode required for MP24943DS-LF-P?
An external bootstrap diode is optional but recommended for high-duty-cycle operation (VOUT/VIN >65%), output voltages above 12V, or fixed 5V input supplies. It ensures reliable BST capacitor charging when the internal charge pump may be insufficient, improving gate drive strength and efficiency.
How does the VO pin implement over-voltage protection?
The VO pin compares a scaled version of VOUT (via external R5/R6 divider) against an internal 0.90V reference. If the VO voltage exceeds 0.90V, the high-side switch turns off after a short delay (~1µs), and the soft-start capacitor discharges-preventing sustained over-voltage at the output.
What is the purpose of the exposed pad on the SOIC8E package?
The exposed pad on MP24943DS-LF-P's SOIC8E package serves as the primary thermal path to the PCB ground plane. It must be soldered directly to a solid copper GND pour to achieve the rated θJA of 50°C/W and sustain 3A continuous output without thermal shutdown.
Does MP24943DS-LF-P support synchronization to an external clock?
No. MP24943DS-LF-P uses a fixed internal 100kHz oscillator with no external sync capability. Frequency variation is limited to ±40% (70–140kHz) over temperature and process, and cannot be locked or dithered externally.
MP24943DS-LF-P Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Monolithic Power Systems Inc.
- Series:
- MP
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- 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):
- 4.5V
- Voltage - Input (Max):
- 55V
- Voltage - Output (Min/Fixed):
- 0.8V
- Voltage - Output (Max):
- 45V
- Current - Output:
- 3A
- Frequency - Switching:
- 100kHz
- Synchronous Rectifier:
- No
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SOIC
MP24943DS-LF-P FAQ
1.How can I place an order for MP24943DS-LF-P through Aetrix?
Please submit a Request for Quotation (RFQ) for MP24943DS-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 MP24943DS-LF-P reliable?
The price and inventory of MP24943DS-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 MP24943DS-LF-P is usually 5 days.
3.What payment methods are accepted for MP24943DS-LF-P?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MP24943DS-LF-P transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MP24943DS-LF-P?
MP24943DS-LF-P orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MP24943DS-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 MP24943DS-LF-P?
For technical support, including MP24943DS-LF-P datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MP24943DS-LF-P requirements.
6.How does Aetrix verify that MP24943DS-LF-P is sourced from the original manufacturer or authorized distributors?
All MP24943DS-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 MP24943DS-LF-P meets industry standards.
7.What is the process for return or replacement of MP24943DS-LF-P?
All MP24943DS-LF-P units undergo pre-shipment inspection (PSI). If there is an issue with MP24943DS-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 MP24943DS-LF-P part is unused and in its original packaging.
Return procedure for MP24943DS-LF-P:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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