The MP2459GJ-Z from Monolithic Power Systems is a monolithic non-synchronous step-down DC/DC converter operating from a wide 4.5V to 55V input range and providing 0.5A peak output current. It integrates a high-voltage power MOSFET and requires only a small number of external components to implement a complete buck regulator.
The converter uses current-mode control, providing fast transient response and simplifying loop stabilization. Its integrated power MOSFET features a typical 1Ω on-resistance, while MPS specifies conversion efficiency of up to approximately 90% under suitable operating conditions.
Switching frequency is fixed at 480kHz typical, with a specified range of 380kHz to 580kHz. This switching frequency enables the use of relatively compact inductors and ceramic output capacitors.
The feedback reference is approximately 0.812V typical, and the recommended adjustable output range extends from 0.81V up to approximately 0.95 × VIN. Maximum duty cycle is approximately 93.5% typical, with a typical minimum on-time of 100ns.
Low-power shutdown operation reduces supply current to only 0.1µA typical, while normal quiescent current is approximately 0.73mA typical.
Integrated protection features include cycle-by-cycle over-current protection, frequency foldback, undervoltage lockout and thermal shutdown. The current-limit threshold is approximately 1.25A typical, with a specified 1.0A-to-1.5A range. Foldback frequency is approximately 150kHz, UVLO rising threshold is 3.3V typical, and thermal shutdown occurs at approximately 165°C.
The exact MP2459GJ-Z is supplied in a compact 6-pin TSOT23 package and is specified for a recommended junction-temperature range of -40°C to +125°C. The recommended operating input is limited to 55V, while the absolute maximum VIN rating is 60V.
MPS currently lists MP2459GJ-Z as an Active Part Number. The manufacturer states that P and Z versions use the same device, with the suffix identifying reel size; the current -Z listing contains 3000 devices per reel. MPS also identifies its parts as lead-free, halogen-free and RoHS compliant.
Key Specifications:
- Brand: Monolithic Power Systems / MPS
- Part Number: MP2459GJ-Z
- Series: MP2459
- Product Type: Step-Down DC/DC Converter
- Topology: Non-Synchronous Buck
- Control Mode: Current Mode
- Input Voltage: 4.5V to 55V
- Peak Output Current: 0.5A
- Adjustable Output: 0.81V to 0.95 × VIN
- Feedback Voltage: 0.812V Typ
- Switching Frequency: 480kHz Typ
- Frequency Range: 380kHz to 580kHz
- Foldback Frequency: 150kHz Typ
- Integrated Power MOSFET: Yes
- MOSFET RDS(on): 1Ω Typ
- Efficiency: Up to Approx. 90%
- Maximum Duty Cycle: 93.5% Typ
- Minimum On-Time: 100ns Typ
- Current Limit: 1.25A Typ
- Current-Limit Range: 1.0A to 1.5A
- Shutdown Current: 0.1µA Typ / 1µA Max
- Quiescent Current: 0.73mA Typ
- UVLO: Yes
- UVLO Rising Threshold: 3.3V Typ
- Cycle-by-Cycle OCP: Yes
- Thermal Shutdown: Yes
- Thermal Shutdown Threshold: 165°C Typ
- Thermal Hysteresis: 20°C Typ
- Recommended Junction Temperature: -40°C to +125°C
- Maximum Junction Temperature: 150°C
- Absolute Maximum VIN: 60V
- Package: TSOT23-6
- Pin Count: 6
- Mounting Type: SMD / SMT
-Z: Tape & Reel- Reel Quantity: 3000 pcs
- Lead-Free: Yes
- Halogen-Free: Yes
- RoHS Compliant: Yes
- Product Status: Active.
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