The MP2143DJ-LF-Z from Monolithic Power Systems is a highly integrated synchronous step-down DC/DC converter operating from a 2.5V to 5.5V input range and delivering up to 3A continuous output current. The output voltage can be regulated as low as 0.6V, making it suitable for low-voltage point-of-load power supplies used with DSPs, FPGAs, smartphones and portable electronic equipment.
The MP2143 uses constant-on-time (COT) control, providing fast transient response while simplifying loop stabilization. At light loads, switching activity is reduced to lower switching-related losses and maintain high efficiency across a wide load range.
The integrated power stage includes an 80mΩ typical PFET high-side switch and a 40mΩ typical NFET synchronous rectifier. The nominal switching frequency is 1.2MHz, enabling the use of compact inductors and low-ESR ceramic output capacitors.
The converter supports 100% duty-cycle operation in dropout, helping maintain output regulation when the input voltage approaches the programmed output voltage. Its feedback reference is typically 0.600V.
Low-power performance is a key feature of the device. Typical quiescent current is only 40µA, while shutdown supply current is approximately 0.1µA typical, making it well suited to battery-powered and standby-sensitive applications.
An integrated Power Good output assists with power sequencing and system monitoring. PG indicates regulation when the feedback voltage is within approximately ±10% of the target level, with a typical Power Good delay of 110µs.
Protection features include cycle-by-cycle current limiting, hiccup-mode short-circuit protection, UVLO and thermal shutdown. The PFET current limit is 4.8A typical and 4.2A minimum. Thermal shutdown occurs at approximately 150°C, with about 30°C thermal hysteresis.
The device also integrates a typical 1.3ms soft-start and automatic output discharge at power-off, helping control start-up stress and discharge the output rail when the regulator is disabled.
The exact MP2143DJ-LF-Z is supplied in an 8-pin TSOT23 package and has a recommended operating junction-temperature range of -40°C to +125°C. The -LF suffix identifies the RoHS-compliant version, while -Z specifies tape-and-reel packaging. MPS currently lists MP2143DJ-LF-Z as an Active Part Number, with 3000 devices per reel.
Key Specifications:
- Brand: Monolithic Power Systems / MPS
- Part Number: MP2143DJ-LF-Z
- Product Type: Synchronous Step-Down Converter
- Topology: Synchronous Buck
- Control Mode: Constant-On-Time / COT
- Input Voltage: 2.5V to 5.5V
- Maximum Continuous Output Current: 3A
- Adjustable Output Voltage: Down to 0.6V
- Feedback Reference: 0.600V Typ
- Default Switching Frequency: 1.2MHz Typ
- High-Side Switch: PFET
- High-Side RDS(on): 80mΩ Typ
- Low-Side Switch: NFET
- Low-Side RDS(on): 40mΩ Typ
- Duty Cycle in Dropout: 100%
- Quiescent Current: 40µA Typ
- Shutdown Current: 0.1µA Typ
- PFET Current Limit: 4.8A Typ / 4.2A Min
- Soft-Start Time: 1.3ms Typ
- Power Good: Yes
- PG Regulation Window: Approx. ±10%
- Power Good Delay: 110µs Typ
- UVLO: Yes
- UVLO Rising Threshold: 2.2V Typ
- Cycle-by-Cycle OCP: Yes
- Hiccup Short-Circuit Protection: Yes
- Automatic Output Discharge: Yes
- Thermal Shutdown: Yes
- Thermal Shutdown Threshold: 150°C Typ
- Thermal Hysteresis: 30°C Typ
- Operating Junction Temperature: -40°C to +125°C
- Maximum Junction Temperature: 150°C
- Package: TSOT23-8
- Pin Count: 8
- Mounting Type: SMD / SMT
-LF: RoHS-Compliant Version-Z: Tape & Reel- Reel Quantity: 3000 pcs
- Lead-Free: Yes
- Halogen-Free: Yes
- Product Status: Active.
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