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Monolithic Power Systems Inc. MP24943DN-LF
- Part No.:
- MP24943DN-LF
- Manufacturer:
- Monolithic Power Systems Inc.
- Package:
- 8-SOIC (0.154", 3.90mm Width) Exposed Pad
- Datasheet:
-
MP24943DN-LF.pdf
- Description:
- IC REG BUCK ADJ 3A 8SOICE
- Quantity:
- Payment:
- Shipping:
Inventory:1,639
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Product details
Overview
MP24943DN-LF from Monolithic Power Systems is a monolithic 3A, 55V, 100kHz step-down DC/DC converter with programmable output over-voltage protection (OVP), internal 0.15Ω 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 datasheet, MP24943DN-LF pinout, MP24943DN-LF application, or MP24943DN-LF equivalent, key selection criteria include its programmable OVP threshold (0.9V reference), SOIC8E package with exposed thermal pad, cycle-by-cycle current limit (6.5A typ), thermal shutdown at 150°C, and compatibility with low-ESR ceramic output capacitors.
Technical Context
The MP24943DN-LF implements a current-mode buck architecture with a fixed 100kHz oscillator, slope-compensated peak-current control, and an error amplifier referenced to a 0.80V ±2% feedback voltage. Its internal high-side MOSFET features 0.15Ω RDS(ON), enabling high efficiency across 4.5–55V input while maintaining stable regulation under line and load transients.
OVP is implemented via an external resistor divider connected to the VO pin, comparing against a precision 0.90V ±4% internal reference; triggering disables the high-side switch after delay and discharges the soft-start capacitor. Enable logic uses 0.4V low and 1.8V high thresholds, supporting direct VIN tie for automatic startup.
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 bias supplies |
| Switching Frequency | Fixed 100kHz - enables predictable EMI filtering and simplifies inductor selection (e.g., 33µH) |
| Feedback Reference | 0.80V ±2% - sets output voltage accuracy and loop stability via external resistor divider |
| OVP Threshold Ref | 0.90V ±4% - allows precise, user-programmable over-voltage trip point using external resistors |
| RDS(ON) | 0.15Ω max - reduces conduction loss and thermal stress at full 3A load |
| Thermal Shutdown | 150°C junction - protects die during overload or poor PCB thermal design; recovers automatically on cooldown |
Pinout & Package
MP24943DN-LF is housed in an SOIC8E package with exposed thermal pad on the underside, rated for 2.5W continuous power dissipation at TA = 25°C (θJA = 50°C/W). The exposed pad must be soldered to a PCB ground plane for optimal thermal performance and EMI reduction.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 VIN | Unregulated Input Supply | Accepts 4.5–55V; requires local 4.7µF ceramic decoupling; powers internal LDO and high-side driver |
| 2 GND / Exposed Pad | Power & Signal Ground Reference | Primary return path for input/output currents; exposed pad must connect to solid GND plane for thermal and noise control |
| 3 EN | Enable Control Input | Logic-level enable: <0.4V = shutdown (4µA IQ), >1.8V = active; compatible with microcontroller GPIO |
| 4 FB | Feedback Sense Input | Monitors output via resistor divider; regulates VOUT to 0.80V reference; sets loop bandwidth with R1 ≈ 301kΩ |
| 5 SS | Soft-Start Timing Node | Connects to external capacitor to control output ramp rate and limit inrush current during startup |
| 6 VO | OVP Sense Input | Compares external resistor divider voltage to 0.90V reference; triggers shutdown if exceeded |
| 7 BST | Bootstrap Supply | Drives high-side gate via external 0.1µF capacitor between BST and SW; optional diode improves charge at high duty cycles |
| 8 SW | Switch Node Output | Drains internal MOSFET; connects to inductor and bootstrap capacitor; high dv/dt node requiring tight layout |
Key Features
| Feature | Design Value |
|---|---|
| Wide Input Range (4.5–55V) | Eliminates need for upstream pre-regulators in 12V/24V/48V automotive systems and industrial power rails |
| Programmable Output OVP | Enables system-level safety compliance by setting custom over-voltage trip points (e.g., 6V for 5V rail) without external comparators |
| Low-ESR Ceramic Cap Stable | Supports X5R/X7R MLCCs only - reduces board area, cost, and failure risk vs. electrolytic or tantalum alternatives |
| Integrated 0.15Ω High-Side MOSFET | Reduces BOM count and layout complexity; eliminates external switch selection and gate drive design |
| Low EMI Switching Edges | Minimizes conducted emissions in sensitive RF environments like GPS receivers without added snubbers or shielding |
Applications
| Automotive GPS Module Power | Automotive Infotainment Core Supply |
|---|---|
Use Scenario: Powers GNSS receiver ICs (e.g., u-blox MAX-M8Q) from vehicle battery with cold-crank tolerance down to 4.5V. IC Role / Device Role / Timing Role: Primary buck regulator delivering clean, regulated 3.3V or 5V with fast transient response to handle GPS signal acquisition bursts. Use Value: Programmable OVP prevents damage to sensitive RF front-end during load dump events; SOIC8E thermal pad sustains 3A load at 85°C ambient. |
Use Scenario: Supplies core voltage (e.g., 1.1V @ 2A) to ARM-based infotainment SoCs in head units with variable input (9–16V nominal, up to 55V during load dump). IC Role / Device Role / Timing Role: Fixed-frequency current-mode controller ensuring stable regulation despite wide VIN swings and dynamic CPU load changes. Use Value: 100kHz switching enables compact 33µH inductor; low quiescent current (800µA typ) extends standby battery life. |
| Linear Charger Bias Supply | Industrial Sensor Hub Power |
Use Scenario: Generates 5V bias for linear battery chargers (e.g., TI BQ2407x) in portable automotive accessories where low noise is mandatory. IC Role / Device Role / Timing Role: Low-EMI step-down converter feeding linear charger input, avoiding switching noise coupling into analog charging paths. Use Value: Controlled edge rates and ceramic-cap stability reduce output ripple to <20mVpp, preserving charger accuracy and thermal performance. |
Use Scenario: Powers multi-sensor nodes (IMU, temp, pressure) in 24V industrial control cabinets with extended temperature range (-40°C to +85°C). IC Role / Device Role / Timing Role: Robust DC/DC front-end providing isolated 3.3V rail with built-in cycle-by-cycle current limit and thermal shutdown. Use Value: 55V absolute max rating withstands 48V surge transients; SOIC8E package ensures reliable thermal derating across full operating range. |
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, 1.5A output, 100–2.2MHz adjustable frequency, no integrated OVP comparator | Requires external OVP circuitry; higher switching frequency enables smaller magnetics but increases EMI filtering complexity | Choose when higher frequency or AEC-Q100 qualification is required; not drop-in due to different pinout and control scheme |
| TPS54360BDDAR | 3.5–60V input, 3.5A output, 100kHz fixed frequency, no programmable OVP - only fixed 110% VOUT OVP | Limited OVP flexibility; lacks dedicated VO pin - OVP threshold tied to output voltage scaling | Prefer when strict 100kHz sync is needed and OVP threshold aligns with 110% of nominal VOUT (e.g., 5.5V for 5V rail) |
Compared with LM5164QPWPRQ1 and TPS54360BDDAR, MP24943DN-LF uniquely integrates a user-programmable OVP function with dedicated VO pin and 0.9V reference, enabling precise over-voltage trip points without external components - critical for protecting downstream RF and analog circuits in automotive systems.
Availability
MP24943DN-LF is available at Aetrix Electronics and suitable for automotive GPS modules, infotainment head units, and industrial sensor hubs requiring stable component supply with guaranteed long-term availability and RoHS-compliant packaging.
Supply support for MP24943DN-LF 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, and global manufacturing partnerships.
The MP24943 belongs to MPS's automotive-grade buck converter product line, engineered specifically for harsh-environment applications demanding wide input range, integrated protection, and AEC-Q200-aligned reliability - not general-purpose DC/DC conversion.
FAQ
What is the maximum output voltage achievable with MP24943DN-LF?
The MP24943DN-LF supports output voltages from 0.8V to 45V, set by an external resistor divider on the FB pin. The upper limit is constrained by the 0.80V feedback reference and practical considerations such as maximum duty cycle (VIN/VOUT ≤ 93% at 100kHz), bootstrap capacitor charging, and SOIC8E thermal limits at high VOUT × IOUT combinations.
How is the programmable OVP threshold configured?
OVP is configured using an external resistor divider from VOUT to GND, with the midpoint connected to the VO pin. The internal 0.90V reference compares against this voltage; threshold is calculated as VOVP = 0.9V × (1 + R5/R6). For example, R5 = 301kΩ and R6 = 680kΩ yields ~6.0V trip point, verified in the datasheet's Figure 3 schematic.
Does MP24943DN-LF require an external bootstrap diode?
An external bootstrap diode (e.g., BAT54) is recommended - but not mandatory - when operating at high duty cycles (>65%), high output voltages (>12V), or with fixed 5V inputs. It ensures reliable BST capacitor recharge and prevents high-side FET dropout; the datasheet provides explicit guidance and placement in Application Information section.
What is the thermal performance difference between SOIC8 and SOIC8E packages?
SOIC8E has θJA = 50°C/W and 2.5W power dissipation at TA = 25°C, versus SOIC8's θJA = 90°C/W and 1.38W. The exposed pad in SOIC8E lowers thermal resistance by 45% and improves heat spreading - essential for sustaining 3A continuous load in automotive ambient temperatures up to +85°C.
Can MP24943DN-LF operate with ceramic output capacitors only?
Yes - the MP24943DN-LF is explicitly designed for stability with low-ESR ceramic capacitors (X5R/X7R), unlike older controllers requiring electrolytic or tantalum types. The datasheet confirms loop stability with typical 100µF ceramic output capacitance and specifies minimal ESR requirements (<10mΩ) for phase margin assurance.
What is the minimum on-time specification and why does it matter?
The MP24943DN-LF has a minimum on-time of 50–250ns (typ 100ns), limiting the lowest achievable output voltage at high input voltages. For example, at VIN = 55V and fSW = 100kHz, minimum VOUT ≈ 5.5V - critical for designing high-step-down ratios and avoiding pulse-skipping instability in light-load conditions.
Is MP24943DN-LF qualified for automotive applications?
MP24943DN-LF is specified for -40°C to +85°C ambient operation and features automotive-grade protections (load dump tolerance up to 55V, thermal shutdown, cycle-by-cycle current limit), but it is not AEC-Q100 certified. For AEC-Q100 designs, engineers should consult MPS's automotive-qualified variants (e.g., MPQ24943 series) or perform full qualification per system requirements.
MP24943DN-LF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Monolithic Power Systems Inc.
- Series:
- -
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width) Exposed Pad
- Packaging:
- Tube
- 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 FAQ
1.How can I place an order for MP24943DN-LF through Aetrix?
Please submit a Request for Quotation (RFQ) for MP24943DN-LF 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 reliable?
The price and inventory of MP24943DN-LF 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 is usually 5 days.
3.What payment methods are accepted for MP24943DN-LF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MP24943DN-LF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MP24943DN-LF?
MP24943DN-LF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MP24943DN-LF 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?
For technical support, including MP24943DN-LF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MP24943DN-LF requirements.
6.How does Aetrix verify that MP24943DN-LF is sourced from the original manufacturer or authorized distributors?
All MP24943DN-LF 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 meets industry standards.
7.What is the process for return or replacement of MP24943DN-LF?
All MP24943DN-LF units undergo pre-shipment inspection (PSI). If there is an issue with MP24943DN-LF, 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 part is unused and in its original packaging.
Return procedure for MP24943DN-LF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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