The MP1542DK-LF-Z from Monolithic Power Systems is a current-mode step-up DC/DC converter supporting an input-voltage range of 2.5V to 22V and an adjustable output range of 3V to 22V. It integrates a 2A, 0.18Ω, 25V N-channel power MOSFET, providing a compact solution for efficient boost conversion with fast transient response.
The MP1542 provides two pin-selectable fixed switching frequencies of 700kHz and 1.3MHz. Its high switching frequency enables the use of small inductors and capacitors, while an external compensation pin allows designers to optimize loop dynamics for specific output-capacitor and load requirements.
A programmable soft-start function helps limit startup inrush current. Integrated protection includes undervoltage lockout, internal current limiting and thermal shutdown. The feedback reference voltage is typically 1.25V, allowing the desired output voltage to be programmed with an external resistor divider.
A representative operating capability specified by MPS is 12V at up to 500mA from a 5V input. The advertised “2A switch” refers to the internal MOSFET switch capability/current-limit level rather than a guaranteed 2A output current under all conversion conditions; available output current depends on input/output voltage, duty cycle, thermal conditions and external components.
The MP1542DK-LF-Z is supplied in a low-profile 8-pin MSOP package and is specified for a -40°C to +85°C ambient temperature range. The “LF” suffix denotes lead-free construction, while “Z” denotes tape-and-reel packaging. MPS currently lists the part as Active, with 2500 pieces per reel for this ordering option.
Key Specifications:
- Brand: Monolithic Power Systems / MPS
- Part Number: MP1542DK-LF-Z
- Product Type: Step-Up DC/DC Converter
- Topology: Boost
- Control Mode: Peak Current Mode
- Input Voltage Range: 2.5V to 22V
- Output Voltage Range: 3V to 22V
- Output Type: Adjustable
- Internal Power Switch: N-Channel MOSFET
- Internal Switch Rating: 2A, 25V
- Switch On-Resistance: 0.18Ω
- Switching Frequency: 700kHz / 1.3MHz
- Frequency Selection: FSEL Pin
- Feedback Reference: 1.25V Typical
- Maximum Duty Cycle: Up to 95% Typical in 700kHz Mode
- Typical Quiescent Current: 700μA
- Typical Shutdown Current: 0.1μA
- Programmable Soft Start: Yes
- External Compensation: Yes
- UVLO: Yes
- Internal Current Limit: Yes
- Thermal Shutdown: Yes
- Typical Capability: 12V / 500mA from 5V Input
- Package: MSOP-8
- Pin Count: 8
- Mounting Type: SMD / SMT
- Ambient Operating Temperature: -40°C to +85°C
- Lead-Free: Yes
- Packaging: Tape & Reel
- Reel Quantity: 2500 pcs
- Product Status: Active
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