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Home > Products > Integrated Circuits (ICs) > Power Management (PMIC) > Voltage Regulators - DC DC Switching Regulators

Monolithic Power Systems Inc. MP24943DS-LF-Z

Name: MP24943DS-LF-Z
Brand: Monolithic Power Systems Inc.
SKU: MP24943DS-LF-Z
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: MP24943DS-LF-Z

Manufacturer:: Monolithic Power Systems Inc.

Category:: Voltage Regulators - DC DC Switching Regulators

Package:: 8-SOIC (0.154", 3.90mm Width)

Datasheet:: MP24943DS-LF-Z.pdf

Description:: IC REG BUCK ADJ 3A 8SOIC

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Product details

Overview

MP24943DS-LF-Z 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, 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 and robust fault protection are critical.

For engineers reviewing the MP24943DS-LF-Z datasheet, MP24943DS-LF-Z pinout, MP24943DS-LF-Z application, or MP24943DS-LF-Z equivalent, key selection criteria include its programmable OVP threshold (0.9V reference), SOIC8E package with exposed thermal pad, 100kHz fixed switching frequency, cycle-by-cycle current limit, and thermal shutdown behavior under sustained overload.

Technical Context

The MP24943DS-LF-Z implements peak-current-mode control with an internal 0.8V feedback reference and slope compensation for stable operation across duty cycles. Its error amplifier drives the RS flip-flop in conjunction with the current-sense amplifier and 100kHz clock, enabling precise regulation and fast transient response.

OVP is implemented via an external resistor divider connected to the VO pin, comparing against a 0.9V internal reference; exceeding this triggers high-side switch disable and soft-start capacitor discharge. The bootstrap circuit (BST–SW) uses an internal regulator to charge the external bootstrap capacitor, with optional external diode support for high-duty-cycle or high-VOUT applications.

Key Specifications

Parameter	Value and Actual Design Meaning
Input Voltage Range	4.5V to 55V - supports direct connection to automotive battery rails including cold-crank (4.5V) and load-dump (55V) transients.
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 predictable EMI filtering design and avoids AM radio band interference while simplifying loop compensation.
Internal MOSFET R_DS(ON)	0.15Ω - reduces conduction loss at 3A, yielding >90% efficiency at mid-load with typical 33µH inductor and ceramic output caps.
OVP Reference Threshold	0.9V on VO pin - allows programmable over-voltage trip point (e.g., 6V with R5=301kΩ, R6=680kΩ), protecting downstream 5V logic from rail collapse or feedback failure.
Feedback Reference Voltage	0.80V ±2% - sets output voltage accuracy; used with external resistor divider (e.g., 301kΩ/57.6kΩ for 5V) and defines regulation precision under line/load variation.
Thermal Shutdown	150°C junction - protects die during sustained overload or poor PCB thermal design; auto-recovery after cooldown ensures system resilience.

Pinout & Package

MP24943DS-LF-Z is housed in an SOIC8E package with exposed thermal pad on the underside, rated for 2.5W continuous power dissipation at T_A = 25°C (θ_JA = 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
VIN (Pin 1)	Main power input	Accepts 4.5–55V unregulated supply; requires local 4.7µF ceramic decoupling; feeds internal LDO and high-side switch drain.
GND (Pin 2)	Power and signal reference	Primary ground return; exposed pad connects here-must be low-inductance path outside D1–C_IN current loop to avoid noise injection into FB.
EN (Pin 3)	Enable control input	Logic-level enable: <0.4V disables IC (I_Q = 4–10µA); >1.8V enables operation; internal pull-down ensures default-off state.
FB (Pin 4)	Output voltage sensing	Connects to resistor divider tap; regulates V_OUT to 0.8V; bias current ±100nA minimizes divider error and power loss.
SS (Pin 5)	Soft-start timing	External capacitor sets startup ramp rate; prevents inrush current and output overshoot during power-up or recovery from fault.
VO (Pin 6)	OVP sense input	Monitors scaled V_OUT via external divider; comparator trips at 0.9V, disabling SW and discharging SS cap for controlled restart.
BST (Pin 7)	Bootstrap supply	Connects to SW via 0.1µF ceramic capacitor; internal regulator charges it to ~5V above SW to drive high-side gate fully.
SW (Pin 8)	Switch node	Drain of internal MOSFET; connects to inductor; high dv/dt node requiring short, shielded trace away from FB/VO routing.

Key Features

Feature	Design Value
Low-EMI switching edges	Controlled rise/fall times (50–100ns) reduce high-frequency harmonics, easing EN55022 compliance without added shielding or ferrites.
Stable with ceramic output capacitors	Compensated for low-ESR ceramics (X5R/X7R), eliminating need for electrolytic or tantalum caps and improving reliability and temperature stability.
Programmable output OVP	Independent VO pin with 0.9V reference enables user-defined over-voltage trip (e.g., 6V, 12V, 24V), safeguarding sensitive loads without external supervisor ICs.
Integrated 0.15Ω MOSFET	Eliminates external high-side switch and driver, reducing BOM count, board area, and layout complexity in space-constrained automotive modules.
Thermal shutdown with auto-recovery	Junction sensor triggers at 150°C and holds SW off until die cools below hysteresis threshold-enables self-healing behavior in intermittent overload conditions.

Applications

Automotive GPS Module Power

Automotive Infotainment Core Supply

Use Scenario: Powers GPS receiver ICs (e.g., u-blox MAX-M8Q) in vehicle navigation units exposed to 9–16V battery rails with load-dump spikes up to 55V.

IC Role / Device Role / Timing Role: Primary buck regulator delivering stable 3.3V/5V from raw battery; handles cold-crank dips and load-dump surges without dropout or latch-up.

Use Value: Programmable OVP prevents damage to GPS RF front-end during feedback resistor failure; SOIC8E thermal pad sustains 3A load in compact dash-mount enclosures.

Use Scenario: Supplies core voltage (1.1V–1.8V) to ARM-based infotainment SoCs (e.g., NXP i.MX8M) in head units with variable input due to alternator ripple and accessory loads.

IC Role / Device Role / Timing Role: High-efficiency intermediate regulator stepping 12V down to 1.2V/1.5V; fixed 100kHz frequency avoids AM-band interference in audio-sensitive environments.

Use Value: Low quiescent current (650–800µA) extends standby time; current-mode control ensures stable regulation despite large input ripple (±2V).

Linear Charger Front-End Supply

Industrial Telematics Tracker Power

Use Scenario: Provides clean, regulated 5V input to linear battery chargers (e.g., TI BQ2407x) in portable diagnostic tools or aftermarket OBD-II devices.

IC Role / Device Role / Timing Role: Pre-regulator isolating charger IC from noisy automotive battery; reduces heat dissipation in linear stage by lowering input-to-output differential.

Use Value: 0.15Ω R_DS(ON) limits dropout at 3A, enabling >92% efficiency; soft-start prevents inrush into charger's input capacitance.

Use Scenario: Powers LTE/GNSS modules (e.g., Quectel EC25 + L76) in fleet-tracking hardware deployed in trucks with wide ambient temperature (-40°C to +85°C) and vibration exposure.

IC Role / Device Role / Timing Role: Main DC-DC converter operating across full industrial temp range; withstands repeated thermal cycling and mechanical shock without parameter drift.

Use Value: Guaranteed operation from -40°C to +85°C; thermal shutdown and OVP ensure long-term reliability in sealed, fanless enclosures.

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, 100kHz–2.2MHz adjustable frequency, no integrated OVP pin	Lacks dedicated VO pin for programmable OVP; requires external comparator for over-voltage monitoring	Select when frequency flexibility or higher input voltage margin is needed, but accept added OVP circuitry.
TPS54340DDAR	3.5–42V input, 3.5A output, 100kHz–2.5MHz adjustable frequency, no OVP function	No built-in OVP capability; relies on external supervisor or system-level monitoring	Choose for higher output current headroom and wider frequency tuning, but implement separate OVP protection.

Compared with LM5164QPWPRQ1 and TPS54340DDAR, MP24943DS-LF-Z provides integrated, pin-configurable OVP-reducing component count and failure modes-while maintaining identical 100kHz operation and SOIC8E thermal performance, making it optimal for safety-critical automotive subsystems.

Availability

MP24943DS-LF-Z is available at Aetrix Electronics and suitable for automotive GPS modules, infotainment systems, and telematics trackers requiring stable component supply across extended temperature ranges and harsh electrical environments.

Supply support for MP24943DS-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, 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 for robustness in 12V/24V vehicle electrical systems, emphasizing wide-input operation, fault tolerance, and AEC-Q100 alignment (though not certified).

FAQ

What is the maximum recommended output voltage for MP24943DS-LF-Z?

The device supports output voltages from 0.8V to 45V, set by the external feedback resistor divider. At 45V output, the minimum input must exceed 45V plus diode drop and losses; practical designs typically limit V_OUT to ≤36V for reliable operation with 55V max input and margin for ripple.

Can MP24943DS-LF-Z operate with a 5V input?

No-its minimum input voltage is 4.5V, but operation at exactly 5V is marginal due to dropout across the internal MOSFET and bootstrap circuit limitations. For 5V input applications, use a part with lower V_IN(MIN), such as MP2451 (3.3V min), or add a pre-regulator stage.

Is an external bootstrap diode required for MP24943DS-LF-Z?

An external bootstrap diode (e.g., BAT54) is optional but recommended when V_OUT >12V or duty cycle exceeds 65%, as the internal bootstrap regulator may not sustain sufficient gate drive. It improves efficiency and reliability in high-V_OUT automotive applications.

How does the VO pin implement over-voltage protection?

The VO pin compares a scaled version of V_OUT (via external resistor divider) against an internal 0.9V reference. If the divided voltage exceeds 0.9V, the high-side switch turns off after a short delay (~1µs), and the soft-start capacitor discharges, forcing a controlled restart once the condition clears.

What is the thermal performance difference between SOIC8 and SOIC8E packages?

SOIC8E has θ_JA = 50°C/W and θ_JC = 10°C/W, enabling 2.5W continuous dissipation at 25°C ambient; standard SOIC8 has θ_JA = 90°C/W and θ_JC = 45°C/W, limiting it to 1.38W. The exposed pad in SOIC8E significantly improves heat transfer to the PCB ground plane.

Does MP24943DS-LF-Z support synchronization to an external clock?

No-the oscillator is fixed at 100kHz and not synchronizable. For applications requiring clock synchronization (e.g., multi-rail systems), consider alternatives like MPQ4331-AEC1 (100kHz–2.5MHz adjustable with sync pin) or external frequency modulation via SS pin (not recommended for tight jitter control).

MP24943DS-LF-Z Specifications

Product attributes: Attribute value

Manufacturer:: Monolithic Power Systems Inc.

Series:: -

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-Z FAQ

1.How can I place an order for MP24943DS-LF-Z through Aetrix?

Please submit a Request for Quotation (RFQ) for MP24943DS-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 MP24943DS-LF-Z reliable?

The price and inventory of MP24943DS-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 MP24943DS-LF-Z is usually 5 days.

3.What payment methods are accepted for MP24943DS-LF-Z?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MP24943DS-LF-Z transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for MP24943DS-LF-Z?

MP24943DS-LF-Z orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your MP24943DS-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 MP24943DS-LF-Z?

For technical support, including MP24943DS-LF-Z datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MP24943DS-LF-Z requirements.

6.How does Aetrix verify that MP24943DS-LF-Z is sourced from the original manufacturer or authorized distributors?

All MP24943DS-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 MP24943DS-LF-Z meets industry standards.

7.What is the process for return or replacement of MP24943DS-LF-Z?

All MP24943DS-LF-Z units undergo pre-shipment inspection (PSI). If there is an issue with MP24943DS-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 MP24943DS-LF-Z part is unused and in its original packaging.

Return procedure for MP24943DS-LF-Z:

1.Submit a request within 90 days.

2.Obtain a Return Material Authorization (RMA) from Aetrix.

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