The MP24943DN-LF-Z from Monolithic Power Systems is a monolithic step-down switch-mode converter capable of delivering up to 3A of continuous output current over a wide input-voltage range. Controlled switching edges are used to provide a low-EMI switching characteristic for high-voltage board-level power conversion.
The recommended input-voltage range is 4.5V to 55V, with a 60V absolute maximum input rating. Output voltage is externally adjustable from 0.8V to 45V, based on a feedback reference of 0.80V typical, with a specified 0.78V-to-0.82V range.
An integrated high-side power MOSFET provides 0.125Ω typical and 0.15Ω maximum ON resistance, reducing the number of external power components required for the converter.
The converter operates at a 100kHz typical fixed switching frequency, with a specified oscillator range of 70kHz to 140kHz. Controlled switching transitions help limit EMI, with typical SW rising and falling edge times of approximately 50ns.
A dedicated programmable output over-voltage protection circuit uses a typical 0.92V OVP reference. The external VO sensing network allows the output over-voltage threshold to be set according to application requirements.
Cycle-by-cycle over-current protection is also integrated. Under the specified 10% duty-cycle test condition, the internal current-limit threshold is 6.5A typical, with a 5.5A-to-8A range. This is an internal protection threshold; the rated continuous output capability remains 3A.
Additional control and protection features include Enable, undervoltage lockout, external soft start, and thermal shutdown. Typical UVLO rising threshold is 3.3V with 200mV hysteresis, while thermal shutdown occurs at approximately 150°C.
Typical shutdown supply current is 4µA, with a 10µA maximum, while typical quiescent supply current is 650µA under the specified operating conditions.
The exact MP24943DN-LF-Z uses the SOIC8E package with an exposed thermal pad. MPS specifies approximately 50°C/W junction-to-ambient and 10°C/W junction-to-case thermal resistance for the SOIC8E package. The rated free-air temperature range is −40°C to +85°C.
The “-LF” suffix identifies RoHS-compliant packaging, while “-Z” identifies tape-and-reel packaging. MPS currently includes MP24943DN-LF-Z in its list of Active Part Numbers and specifies 2,500 devices per reel.
Key Specifications
- Manufacturer: Monolithic Power Systems
- Manufacturer Part Number: MP24943DN-LF-Z
- Product Family: MP24943
- Device Type: Step-Down DC-DC Converter
- Topology: Buck
- Continuous Output Current: 3A
- Input Voltage Range: 4.5V to 55V
- Absolute Maximum VIN: 60V
- Adjustable Output Range: 0.8V to 45V
- Feedback Voltage: 0.80V Typical
- Feedback Range: 0.78V to 0.82V
- Typical Switching Frequency: 100kHz
- Switching Frequency Range: 70kHz to 140kHz
- Integrated Power MOSFET: Yes
- Typical MOSFET RDS(on): 0.125Ω
- Maximum MOSFET RDS(on): 0.15Ω
- Programmable Output OVP: Yes
- Typical OVP Reference: 0.92V
- Cycle-by-Cycle Current Limit: Yes
- Typical Current Limit: 6.5A
- Current-Limit Range: 5.5A to 8A
- Enable Input: Yes
- External Soft Start: Yes
- UVLO: Yes
- Typical UVLO Rising Threshold: 3.3V
- UVLO Hysteresis: 200mV
- Thermal Shutdown: Yes
- Typical Thermal Shutdown: 150°C
- Typical Shutdown Current: 4µA
- Maximum Shutdown Current: 10µA
- Typical Quiescent Current: 650µA
- Maximum Quiescent Current: 800µA
- Free-Air Temperature Range: −40°C to +85°C
- Package: SOIC8E
- Pin Count: 8
- Exposed Thermal Pad: Yes
- RθJA: Approximately 50°C/W
- RθJC: Approximately 10°C/W
- Mounting Type: Surface Mount
- “LF” Suffix: RoHS-Compliant Packaging
- “Z” Suffix: Tape and Reel
- Standard Reel Quantity: 2,500
- Product Status: Active
Typical Applications
MPS specifically lists automotive GPS, automotive entertainment systems, and power supplies for linear chargers as MP24943 applications.
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