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Monolithic Power Systems Inc. MP24943DN-LF-Z
- Part No.:
- MP24943DN-LF-Z
- Manufacturer:
- Monolithic Power Systems Inc.
- Package:
- 8-SOIC (0.154", 3.90mm Width) Exposed Pad
- Datasheet:
-
MP24943DN-LF-Z.pdf
- Description:
- IC REG BUCK ADJ 3A 8SOICE
- Quantity:
- Payment:
- Shipping:
Inventory:13,676
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Product details
Overview
MP24943DN-LF-Z from Monolithic Power Systems is a monolithic 100kHz step-down DC/DC converter delivering 3A continuous output current, supporting 4.5V–55V input and 0.8V–45V adjustable output voltage, with programmable output over-voltage protection (OVP) threshold and integrated 0.15Ω high-side MOSFET-used in automotive GPS and entertainment power supplies.
For engineers reviewing the MP24943DN-LF-Z datasheet, MP24943DN-LF-Z pinout, MP24943DN-LF-Z application, or MP24943DN-LF-Z equivalent, key selection criteria include input voltage range (4.5–55V), OVP programmability via VO pin, fixed 100kHz switching frequency, thermal shutdown behavior, and SOIC8E package with exposed pad for enhanced thermal performance.
Technical Context
The MP24943DN-LF-Z implements current-mode control with a 100kHz fixed-frequency oscillator and internal slope compensation to stabilize loop dynamics across line/load variations. Its error amplifier compares FB voltage against a precise 0.80V reference, while cycle-by-cycle current limiting monitors peak switch current via internal sense FET.
OVP functionality operates independently of the main regulation loop: an external resistor divider connects VOUT to VO, comparing against a 0.90V internal reference; exceeding this triggers immediate high-side switch disable and soft-start capacitor discharge. The bootstrap circuit (BST–SW) sustains gate drive for the integrated MOSFET using an on-chip charge pump regulator.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 4.5V to 55V - supports wide automotive battery transients and industrial 48V systems without pre-regulation. |
| Output Current | 3A continuous - sufficient for powering multi-rail subsystems like GPS baseband + RF front-end. |
| Switching Frequency | Fixed 100kHz - enables predictable EMI filtering and simplifies inductor selection (e.g., 33µH standard value). |
| Feedback Reference | 0.80V ±2% - sets output voltage accuracy and defines resistor-divider ratio for stable regulation. |
| OVP Threshold Reference | 0.90V ±4% - allows programmable over-voltage trip point (e.g., 6V OVP with R5=301kΩ, R6=680kΩ). |
| Internal MOSFET RDS(ON) | 0.15Ω typical - limits conduction loss at 3A (≤1.35W dissipation), enabling compact thermal design in SOIC8E. |
| Thermal Shutdown | 150°C junction - protects die during overload or poor PCB heatsinking; auto-recovery after cooldown. |
Pinout & Package
MP24943DN-LF-Z uses the SOIC8E package with exposed thermal pad on underside, requiring connection to PCB ground plane for optimal thermal resistance (θJA = 50°C/W). Pin 2 (GND) and the exposed pad must be tied together externally.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN (Pin 1) | Main power input | Accepts 4.5–55V unregulated supply; requires local 4.7µF ceramic decoupling capacitor. |
| GND (Pin 2) | Power and signal reference | Reference node for FB, EN, SS, VO; exposed pad must be soldered to GND plane for thermal management. |
| EN (Pin 3) | Enable control input | Logic-level enable: <0.4V disables IC; >1.8V enables operation; internal pull-down ensures default-off state. |
| FB (Pin 4) | Output voltage feedback | Monitors resistive divider output; regulates VOUT to maintain 0.80V at this pin. |
| SS (Pin 5) | Soft-start timing | Connects to external capacitor to linearly ramp output voltage and limit inrush current. |
| VO (Pin 6) | OVP sense input | Compares external resistor divider voltage against 0.90V reference; triggers shutdown if exceeded. |
| BST (Pin 7) | Bootstrap supply | Forms floating gate-drive supply with SW pin; requires 0.1µF ceramic capacitor between BST and SW. |
| SW (Pin 8) | Switch node | Drives external inductor; carries high di/dt switching current-requires short, low-inductance PCB trace. |
Key Features
| Feature | Design Value |
|---|---|
| Low-EMI switching edges | Controlled rise/fall times (50–100ns) reduce broadband noise, easing EN55022 compliance in automotive modules. |
| Stable with ceramic output caps | Compatible with low-ESR X5R/X7R ceramics (e.g., 100µF total), eliminating need for bulk electrolytics. |
| Programmable OVP | Independent protection circuitry allows user-defined trip point (e.g., 6V for 5V rail), preventing downstream IC damage. |
| Integrated power switch | 0.15Ω RDS(ON) MOSFET eliminates external high-side switch, reducing BOM count and layout complexity. |
| Thermal-enhanced SOIC8E | Exposed pad lowers θJA to 50°C/W-enables 3A operation at +85°C ambient without heatsink. |
Applications
| Automotive GPS Module Power | Automotive Infotainment Display Supply |
|---|---|
Use Scenario: Powers GPS baseband processor and RF front-end in vehicle navigation units under 12V/24V battery input with load dump tolerance. IC Role / Device Role / Timing Role: Primary buck regulator delivering stable 3.3V or 5V rail; handles input transients up to 55V. Use Value: Programmable OVP prevents damage during alternator load dump events; SOIC8E package withstands automotive thermal cycling. | Use Scenario: Supplies LCD backlight driver and audio codec in head-unit displays operating from 12V vehicle battery. IC Role / Device Role / Timing Role: Fixed-frequency buck converter generating 12V or 5V output with minimal external components. Use Value: Low EMI signature avoids interference with AM/FM radio reception; 100kHz frequency enables small 33µH inductor. |
| Industrial 48V-to-5V Conversion | Linear Charger Bias Supply |
Use Scenario: Converts 48V PoE++ or telecom supply to 5V for microcontroller and sensor interface in factory automation nodes. IC Role / Device Role / Timing Role: High-input-voltage step-down regulator with wide VIN range and robust thermal performance. Use Value: 55V max input rating accommodates 48V system surges; 3A output supports multiple peripherals without derating. | Use Scenario: Generates clean 5V bias for linear battery chargers (e.g., TP4056) in portable diagnostic tools powered by 12V vehicle socket. IC Role / Device Role / Timing Role: Pre-regulator supplying constant-voltage input to linear charger IC, improving overall efficiency vs. direct 12V-to-battery drop. Use Value: Stable 0.80V reference ensures accurate output regulation; soft-start prevents inrush into downstream LDOs. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar step-down converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM5164QDDARQ1 | 4.5–65V input, 1.5A output, 100kHz–2.2MHz programmable frequency, no integrated OVP comparator | Requires external OVP circuitry; better suited for designs needing frequency synchronization or higher VIN margin | Select when programmable frequency or AEC-Q100 qualification is required; not drop-in for OVP-critical systems |
| TPS54360BDRCT | 3.5–60V input, 3.5A output, 100kHz–2.5MHz adjustable frequency, integrated OVP with fixed 6.1V threshold | Fixed OVP threshold limits flexibility; higher quiescent current (146µA vs. 800µA active) | Choose when fixed 6.1V OVP suffices and higher output current margin is needed; less suitable for custom OVP points |
Compared with LM5164QDDARQ1 and TPS54360BDRCT, MP24943DN-LF-Z offers unique programmable OVP via VO pin and optimized SOIC8E thermal performance for 3A loads at lower cost, but lacks frequency adjustability or AEC-Q100 certification.
Availability
MP24943DN-LF-Z is available at Aetrix Electronics and suitable for automotive GPS modules, infotainment display supplies, and industrial 48V-to-5V conversion requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for MP24943DN-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, headquartered in California and serving global automotive, industrial, and consumer markets since 1997.
The MP24943 belongs to MPS's high-voltage buck converter product line, designed specifically for automotive and industrial applications demanding wide input range, integrated protection, and robust thermal performance in compact packages.
FAQ
What is the maximum recommended output voltage for MP24943DN-LF-Z?
The MP24943DN-LF-Z supports output voltages up to 45V, limited by absolute maximum ratings and internal OVP comparator headroom. Operation above 45V risks violating the VO pin voltage limit (6.5V max) and may cause premature OVP triggering or reliability degradation.
Can MP24943DN-LF-Z operate with 3.3V input?
No-MP24943DN-LF-Z has a minimum input voltage of 4.5V due to under-voltage lockout (UVLO) threshold of 3.3V ±0.3V with 200mV hysteresis. At 3.3V input, the device remains disabled; a pre-buck or charge-pump booster is required for sub-4.5V sources.
How does the VO pin determine over-voltage trip point?
The VO pin compares the divided output voltage against an internal 0.90V reference. With R5=301kΩ and R6=680kΩ, VO sees 0.90V when VOUT reaches 6.0V (VO = VOUT × R6/(R5+R6)), triggering shutdown after a short delay-enabling precise, user-defined OVP thresholds.
Is an external bootstrap diode required for MP24943DN-LF-Z?
An external bootstrap diode (e.g., BAT54) is recommended-not required-for duty cycles >65%, output voltages >12V, or fixed 5V input supplies, where the internal charge pump may insufficiently recharge the BST capacitor; omission risks high-side FET turn-off failure.
What is the thermal performance difference between SOIC8 and SOIC8E packages?
SOIC8E provides significantly better thermal performance: θJA = 50°C/W vs. 90°C/W for SOIC8, and θJC = 10°C/W vs. 45°C/W-due to the exposed pad connected to GND. This allows MP24943DN-LF-Z to sustain full 3A output at +85°C ambient, whereas SOIC8 requires derating above +60°C.
Does MP24943DN-LF-Z support synchronous rectification?
No-MP24943DN-LF-Z uses an internal N-channel MOSFET for the high-side switch and requires an external Schottky diode (e.g., B560C) for low-side conduction during off-time. It is an asynchronous buck converter, not synchronous.
What is the minimum output capacitor ESR requirement?
MP24943DN-LF-Z is stable with zero-ESR ceramic capacitors (X5R/X7R); no minimum ESR is required. Typical designs use 100µF total output capacitance with ≤10mΩ effective series resistance to minimize ripple and ensure phase margin.
MP24943DN-LF-Z Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Monolithic Power Systems Inc.
- Series:
- -
- 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:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SOICE
MP24943DN-LF-Z FAQ
1.How can I place an order for MP24943DN-LF-Z through Aetrix?
Please submit a Request for Quotation (RFQ) for MP24943DN-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 MP24943DN-LF-Z reliable?
The price and inventory of MP24943DN-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 MP24943DN-LF-Z is usually 5 days.
3.What payment methods are accepted for MP24943DN-LF-Z?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MP24943DN-LF-Z transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MP24943DN-LF-Z?
MP24943DN-LF-Z orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MP24943DN-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 MP24943DN-LF-Z?
For technical support, including MP24943DN-LF-Z datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MP24943DN-LF-Z requirements.
6.How does Aetrix verify that MP24943DN-LF-Z is sourced from the original manufacturer or authorized distributors?
All MP24943DN-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 MP24943DN-LF-Z meets industry standards.
7.What is the process for return or replacement of MP24943DN-LF-Z?
All MP24943DN-LF-Z units undergo pre-shipment inspection (PSI). If there is an issue with MP24943DN-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 MP24943DN-LF-Z part is unused and in its original packaging.
Return procedure for MP24943DN-LF-Z:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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