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Monolithic Power Systems Inc. MP24943DN-LF-P
- Part No.:
- MP24943DN-LF-P
- Manufacturer:
- Monolithic Power Systems Inc.
- Package:
- 8-SOIC (0.154", 3.90mm Width) Exposed Pad
- Datasheet:
-
MP24943DN-LF-P.pdf
- Description:
- IC REG BUCK ADJ 3A 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:3,684
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Product details
Overview
MP24943DN-LF-P from Monolithic Power Systems is a monolithic 3A, 55V, 100kHz step-down DC/DC converter with programmable output over-voltage protection (OVP), 0.15Ω internal MOSFET switch, and fixed-frequency current-mode control. 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 range and robust fault protection are critical.
For engineers reviewing the MP24943DN-LF-P datasheet, MP24943DN-LF-P pinout, MP24943DN-LF-P application, or MP24943DN-LF-P equivalent, this device requires attention to its SOIC8E package thermal pad connection, VO pin OVP threshold configuration via external resistor divider, BST capacitor placement, and EN logic thresholds (0.4V low / 1.8V high) for reliable enable control in harsh environments.
Technical Context
The MP24943DN-LF-P implements peak-current-mode control with a fixed 100kHz oscillator, 0.8V feedback reference, and integrated slope compensation. Its internal 0.15Ω high-side MOSFET switch enables efficient operation across 4.5–55V input while maintaining stable regulation under line and load transients.
OVP is implemented via the VO pin with a precise 0.9V internal reference; external resistor division sets the trip threshold (e.g., 6V). Fault handling includes cycle-by-cycle current limiting (typ. 6.5A), thermal shutdown at 150°C, and UVLO with 3.3V rising threshold and 200mV hysteresis.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 4.5V to 55V - supports direct battery-fed automotive systems including cold-crank (4.5V) and load-dump (55V) conditions. |
| Output Current | 3A continuous - sufficient for powering GPS modules, infotainment SoCs, or linear charger front-ends without external pass devices. |
| Switching Frequency | Fixed 100kHz - enables use of low-cost, high-inductance power inductors and simplifies EMI filtering design. |
| Feedback Reference | 0.80V ±2% - sets output voltage accuracy; used with external resistor divider for precise VOUT programming (0.8V–45V). |
| OVP Threshold Ref | 0.90V ±4% - defines programmable over-voltage trip point; external R-divider on VO pin determines actual VOUT OVP level. |
| RDS(ON) | 0.15Ω max - reduces conduction loss at 3A, enabling >90% efficiency at mid-load in typical 12V→5V designs. |
| Thermal Shutdown | 150°C junction - protects die during overload or poor PCB thermal design; SOIC8E package offers 2.5W PD at TA=25°C. |
Pinout & Package
MP24943DN-LF-P is housed in an SOIC8E package with exposed thermal pad on the underside, requiring solder connection to PCB ground plane for optimal thermal performance (θJA = 50°C/W). Pin 2 (GND) and the exposed pad must be electrically and thermally tied to the same ground net.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN (Pin 1) | Unregulated input supply | Accepts 4.5–55V; requires local ceramic decoupling (≥4.7µF) placed adjacent to Pin 1 and Pin 2. |
| GND (Pin 2) + Exposed Pad | Power and signal reference ground | Primary return path for input/output currents; exposed pad must be soldered to large GND copper area for thermal dissipation. |
| EN (Pin 3) | Enable control input | Logic-high (>1.8V) enables regulation; logic-low (<0.4V) disables switch and reduces quiescent current to 10µA. |
| FB (Pin 4) | Feedback sensing node | Monitors divided output voltage; internal 0.8V reference compares against FB to regulate VOUT. |
| SS (Pin 5) | Soft-start timing node | Connects to external capacitor to control output voltage ramp rate and limit inrush current during startup. |
| VO (Pin 6) | OVP sense input | Receives divided VOUT; trips shutdown when voltage exceeds internal 0.9V reference (e.g., 6V OVP with 301kΩ/680kΩ divider). |
| BST (Pin 7) | Bootstrap supply for high-side gate drive | Requires 0.1µF ceramic capacitor between BST and SW to generate gate drive voltage above VIN for internal MOSFET. |
| SW (Pin 8) | Switch node output | Drives external inductor; high di/dt node-must be routed short and away from sensitive analog traces (FB, VO, SS). |
Key Features
| Feature | Design Value |
|---|---|
| Wide input range (4.5V–55V) | Enables single-supply operation across 12V and 24V automotive batteries, including cold-crank and load-dump transients. |
| Programmable output OVP | Configurable trip point (e.g., 6V) via external resistor divider on VO pin-prevents damage to downstream 5V logic during feedback fault. |
| Low-RDS(ON) internal switch (0.15Ω) | Reduces conduction loss and thermal stress, allowing full 3A output without external MOSFET in space-constrained layouts. |
| Stable with ceramic output capacitors | Eliminates need for high-ESR electrolytics; supports compact, long-life X5R/X7R MLCCs (e.g., 100µF total) for output filtering. |
| Low-EMI switching edges | Controlled slew rates minimize radiated emissions-critical for automotive EMC compliance without added snubbers or shielding. |
Applications
| Automotive GPS Module Power | Automotive Infotainment Core Supply |
|---|---|
|
Use Scenario: Powers GPS receiver ICs (e.g., u-blox MAX-M8Q) directly from vehicle battery with transient immunity. IC Role / Device Role / Timing Role: Primary buck regulator delivering stable 3.3V/5V rail; handles 4.5–55V input variation and load dumps. Use Value: Eliminates need for pre-regulator stage; programmable OVP prevents GPS IC latch-up during feedback open-circuit faults. |
Use Scenario: Supplies core voltage (e.g., 1.1V @ 2A) to ARM-based infotainment SoCs in head units. IC Role / Device Role / Timing Role: Intermediate buck converter stepping 12V battery down to 5V, feeding secondary LDO or POL module. Use Value: Fixed 100kHz frequency allows predictable EMI filter design; low quiescent current (<1µA shutdown) meets automotive standby requirements. |
| Linear Charger Front-End | Industrial 24V-to-12V Conversion |
|
Use Scenario: Provides regulated 5V/3A input to linear battery chargers (e.g., TI BQ2407x) in portable diagnostic tools. IC Role / Device Role / Timing Role: High-efficiency pre-regulator ensuring constant input to linear charger despite varying input source (e.g., USB-C PD or 12V adapter). Use Value: Internal 0.15Ω MOSFET avoids discrete FET + driver complexity; SS pin enables controlled charge-enable sequencing. |
Use Scenario: Converts 24V industrial bus to 12V auxiliary rail for sensors, PLC I/O, or display backlights. IC Role / Device Role / Timing Role: Robust primary DC/DC stage operating continuously at elevated ambient temperatures (up to +85°C). Use Value: SOIC8E thermal pad and 125°C max junction temperature support reliable operation in enclosed enclosures without forced air. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar step-down converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MPQ24943DN-LF-Z | Automotive-grade AEC-Q100 qualified version with extended temp range (–40°C to +125°C) and enhanced ESD/EMC robustness. | Required for under-hood automotive modules; not necessary for cabin-mounted GPS or infotainment where ambient ≤85°C. | Select MPQ24943DN-LF-Z if AEC-Q100 qualification or >85°C operation is mandatory; otherwise MP24943DN-LF-P offers cost advantage. |
| LM5164QDDARQ1 | 4.5–65V input, 1.5A output, 100kHz–2.2MHz adjustable frequency, no integrated OVP; requires external OVP circuitry. | Suitable for lower-current applications needing higher switching frequency flexibility; lacks native OVP functionality. | Choose LM5164QDDARQ1 only if frequency tuning or >55V input is required; MP24943DN-LF-P provides simpler, OVP-integrated solution for 3A/55V use cases. |
Compared with MPQ24943DN-LF-Z, the MP24943DN-LF-P trades automotive qualification for lower cost and identical electrical specs in commercial-temp applications; versus LM5164QDDARQ1, it delivers higher current and built-in OVP at the expense of frequency adjustability.
Availability
MP24943DN-LF-P is available at Aetrix Electronics and suitable for automotive GPS modules, infotainment subsystems, and linear charger front-end power supplies requiring stable component supply across production lifecycles.
Supply support for MP24943DN-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 design centers in the US, China, and Taiwan.
The MP24943 belongs to MPS's industrial-grade buck converter product line, engineered for wide-input automotive and industrial power conversion where reliability, fault protection, and minimal external components are essential.
FAQ
What is the maximum recommended output voltage for MP24943DN-LF-P?
The MP24943DN-LF-P supports output voltages up to 45V, set by the external resistor divider on the FB pin. This limit arises from internal biasing constraints and absolute maximum ratings of the feedback amplifier. Exceeding 45V risks violating the 6.5V absolute maximum rating on the FB pin and may cause regulation instability or damage.
How is the output over-voltage protection threshold configured?
OVP is configured using an external resistor divider from VOUT to GND, with the midpoint connected to the VO pin. The internal 0.9V reference determines trip point: VOVP = 0.9V × (1 + R5/R6). For example, a 301kΩ (R5) and 680kΩ (R6) divider sets VOVP ≈ 6V. R5 should be ≥300kΩ to minimize divider current and power loss.
Why does the MP24943DN-LF-P require a bootstrap capacitor between BST and SW pins?
The BST–SW capacitor forms a floating voltage source that drives the gate of the internal high-side MOSFET above VIN. Since the switch node (SW) swings from GND to VIN, the BST capacitor charges to ~5V above SW during the off-time, enabling full enhancement of the N-channel MOSFET. A 0.1µF X7R ceramic capacitor placed directly between BST and SW is mandatory for proper operation.
Can MP24943DN-LF-P operate with input voltage below 4.5V?
No. The MP24943DN-LF-P has a guaranteed minimum operating input voltage of 4.5V due to internal bias circuitry and UVLO threshold (3.3V rising with 200mV hysteresis). Below 4.5V, the device may fail to start or exhibit erratic regulation, and the internal MOSFET cannot be fully enhanced. For sub-4.5V inputs, consider a different converter such as the MP2451.
What is the purpose of the exposed thermal pad on the SOIC8E package?
The exposed pad on the SOIC8E package serves as the primary thermal conduction path from the silicon die to the PCB. It must be soldered to a solid copper ground plane to achieve the specified θJA = 50°C/W and support the full 2.5W power dissipation at 25°C ambient. Leaving it unconnected degrades thermal performance by >40%, risking thermal shutdown under 3A load.
Is an external Schottky diode required for MP24943DN-LF-P operation?
Yes-an external Schottky diode (e.g., B560C) is required across the inductor to provide a freewheeling path when the internal switch is off. The MP24943DN-LF-P does not integrate a synchronous rectifier; the diode conducts inductor current during the off-time. Use a low-forward-voltage, fast-recovery Schottky rated for ≥3A average and ≥6.5A peak current.
How does soft-start function with the SS pin?
The SS pin connects to an external capacitor that controls the ramp rate of the internal error amplifier reference. Charging this capacitor linearly increases the target output voltage, limiting inrush current into output capacitors. Typical values range from 1nF (fast start) to 100nF (slow, low-stress start); 10nF yields ~10ms soft-start time in standard configurations.
MP24943DN-LF-P Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Monolithic Power Systems Inc.
- Series:
- MP
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width) 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):
- 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:
- 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SOIC-EP
MP24943DN-LF-P FAQ
1.How can I place an order for MP24943DN-LF-P through Aetrix?
Please submit a Request for Quotation (RFQ) for MP24943DN-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 MP24943DN-LF-P reliable?
The price and inventory of MP24943DN-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 MP24943DN-LF-P is usually 5 days.
3.What payment methods are accepted for MP24943DN-LF-P?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MP24943DN-LF-P transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MP24943DN-LF-P?
MP24943DN-LF-P orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MP24943DN-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 MP24943DN-LF-P?
For technical support, including MP24943DN-LF-P datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MP24943DN-LF-P requirements.
6.How does Aetrix verify that MP24943DN-LF-P is sourced from the original manufacturer or authorized distributors?
All MP24943DN-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 MP24943DN-LF-P meets industry standards.
7.What is the process for return or replacement of MP24943DN-LF-P?
All MP24943DN-LF-P units undergo pre-shipment inspection (PSI). If there is an issue with MP24943DN-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 MP24943DN-LF-P part is unused and in its original packaging.
Return procedure for MP24943DN-LF-P:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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