Monolithic Power Systems Inc. MP1482DS-LF-P

Overview

MP1482DS-LF-P from Monolithic Power Systems is a synchronous rectified, current-mode step-down DC/DC converter integrating dual 130mΩ N-channel MOSFETs, delivering 2A continuous output current across a 4.75V–18V input range, regulating down to 0.923V with fixed 340kHz switching frequency-used in FPGA/DSP power supplies and notebook CPU core rails.

For engineers reviewing the MP1482DS-LF-P datasheet, MP1482DS-LF-P pinout, MP1482DS-LF-P application, or MP1482DS-LF-P equivalent, key selection criteria include its integrated high- and low-side MOSFETs, programmable soft-start via SS pin, cycle-by-cycle overcurrent protection, and compatibility with low-ESR ceramic output capacitors in compact SOIC8 layouts.

Technical Context

The MP1482DS-LF-P employs peak current-mode control with internal transconductance error amplifier (GEA = 800μA/V) and COMP pin-based loop compensation, enabling fast transient response and stable regulation across wide load and line variations. Its functional block includes dedicated OVP comparator (trip at 1.1V FB overvoltage), UVLO (4.10V threshold), and thermal shutdown (160°C).

Operation requires external bootstrap capacitor between SW and BS pins to drive the high-side MOSFET gate above VIN; the IC generates an internal 5V rail to charge this capacitor during low-SW periods. Feedback is sensed at FB with precise 0.923V reference, and EN pin provides logic-level enable/disable with 1.5V typical threshold and 210mV hysteresis.

Key Specifications

Pinout & Package

MP1482DS-LF-P is housed in an 8-pin SOIC package (JEDEC MS-012, variation AA), with exposed pad not electrically connected. Thermal resistance θ_JA = 90°C/W on 4-layer board, supporting up to 1.38W continuous dissipation at +25°C ambient.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar synchronous buck regulator applications.

Compared with MP1482DS-LF-P, MP1476DS-LF-Z offers higher current and frequency for next-gen designs, while LM2678-ADJ/NOPB trades integration for cost and simplicity-making MP1482 optimal for balanced performance in mid-power embedded systems.

Availability

MP1482DS-LF-P is available at Aetrix Electronics and suitable for FPGA power supplies, notebook auxiliary rails, networking ASIC biasing, and green appliance control modules requiring stable component supply across extended temperature and lifecycle requirements.

Supply support for MP1482DS-LF-P 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 MP1482 belongs to MPS's mainstream synchronous buck regulator product line, engineered for cost-effective, compact DC/DC conversion in consumer, computing, and industrial applications where integration, efficiency, and thermal robustness are critical.

FAQ

What is the minimum recommended output capacitor for stable operation?

The MP1482DS-LF-P is stable with low-ESR ceramic capacitors as small as 10µF (X5R/X7R dielectric). For 3.3V/2A operation, a 22µF/6.3V ceramic capacitor is typical. Tantalum or polymer electrolytics may be used if ESR exceeds 10mΩ, but ceramic is preferred for size and reliability.

Does MP1482DS-LF-P require an external bootstrap diode?

An external Schottky diode (e.g., IN4148) from VOUT to BS is recommended when duty cycle exceeds 65%-such as at 3.3V output from 12V input (D ≈ 28%) or 5V from 12V (D ≈ 42%). It is not required for most configurations but improves efficiency by ~2% under high-duty conditions.

How is output voltage accuracy affected by resistor tolerance in the FB divider?

With a 0.923V reference and typical 1% feedback resistors, output voltage error is dominated by R1/R2 ratio tolerance. For a 3.3V design using 10kΩ (R2) and 26.1kΩ (R1), ±1% resistor tolerance contributes ±0.033V (±1%) error; absolute reference drift adds ±0.023V over temperature.

Can MP1482DS-LF-P operate with input voltage below 4.75V?

No-input voltage below 4.75V triggers UVLO (threshold 4.10V ±0.3V), disabling switching. Operation below 4.75V is outside specification and may cause erratic regulation, excessive current draw, or failure to start. For sub-5V inputs, consider MP2307 or MP1584.

What thermal derating applies above +85°C ambient?

Maximum junction temperature is 125°C. With θ_JA = 90°C/W, allowable power dissipation drops linearly: at +100°C ambient, max P_D = (125–100)/90 = 0.28W. Derate output current accordingly-e.g., at 12V input/3.3V output, max load falls to ~0.8A above +100°C.

Is MP1482DS-LF-P RoHS compliant and lead-free?

Yes-MP1482DS-LF-P carries the "LF" suffix indicating lead-free, RoHS-compliant packaging per EU Directive 2011/65/EU. All solderable terminations meet JEDEC J-STD-020 moisture sensitivity level 3, and the device is qualified to MSL3 per JEDEC standards.

How does the COMP pin compensation network affect transient response?

The RC network on COMP sets loop bandwidth and phase margin: a 10kΩ resistor + 1nF capacitor yields ~16kHz crossover, balancing stability and ~20µs load-step recovery. Increasing C3 lowers bandwidth for better stability; decreasing it raises bandwidth for faster transients-but risks oscillation if phase margin falls below 45°.