Monolithic Power Systems Inc. MP1482DS-LF-Z

Overview

MP1482DS-LF-Z from Monolithic Power Systems is a synchronous rectified, current-mode step-down DC/DC converter integrating dual 130mΩ N-channel MOSFETs, delivering up to 2A continuous output current across a 4.75V–18V input range, regulating output from 0.923V to 15V with fixed 340kHz switching frequency and programmable soft-start-used in FPGA/DSP power supplies and notebook computer core voltage regulation.

For engineers reviewing the MP1482DS-LF-Z datasheet, MP1482DS-LF-Z pinout, MP1482DS-LF-Z application, or MP1482DS-LF-Z equivalent, key selection criteria include its integrated high- and low-side MOSFETs, 0.923V feedback reference, cycle-by-cycle overcurrent protection, input UVLO threshold of 4.10V, and SOIC8 thermal resistance (θJA = 90°C/W).

Technical Context

The MP1482DS-LF-Z employs peak current-mode control with internal transconductance error amplifier (GEA = 800μA/V) and COMP-pin-based loop compensation. Its functional block includes a 340kHz oscillator, 0.923V precision feedback comparator, and independent shutdown comparators for EN (1.5V threshold) and input UVLO (4.10V rising edge).

It uses an external bootstrap capacitor between SW and BS pins to drive the high-side MOSFET gate above VIN, enabling synchronous rectification without external diodes. Protection features include thermal shutdown at 160°C, short-circuit oscillation at 100kHz, and 1μA shutdown quiescent current.

Key Specifications

Pinout & Package

MP1482DS-LF-Z is housed in an 8-pin SOIC package (JEDEC MS-012, variation AA), with exposed pad not electrically connected. The package supports 1.38W continuous power dissipation at +25°C ambient and provides θJA = 90°C/W and θJC = 45°C/W thermal performance.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MP1482DS-LF-Z, MP1476DS-LF-Z offers higher current and frequency for denser designs, while LM2678SD-3.3/NOPB trades integration for flexibility and thermal headroom-making MP1482 optimal for cost-sensitive, space-constrained 2A applications with adjustable output.

Availability

MP1482DS-LF-Z is available at Aetrix Electronics and suitable for FPGA power supplies, notebook computing subsystems, distributed telecom power, and green appliance control boards requiring stable component supply and long-term manufacturability.

Supply support for MP1482DS-LF-Z 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, headquartered in Kirkland, Washington, with global design and support operations.

The MP1482 belongs to MPS's mainstream synchronous buck converter product line, designed specifically for cost-effective, compact, and efficient point-of-load regulation in consumer, computing, and industrial applications.

FAQ

What is the minimum recommended input voltage for reliable operation?

The MP1482DS-LF-Z has a guaranteed operating input range of 4.75V to 18V. Below 4.75V, input under-voltage lockout activates at 4.10V (rising edge), disabling regulation. Sustained operation below 4.75V risks unstable switching or dropout-designs must maintain VIN ≥4.75V under worst-case load and line conditions.

Can the MP1482DS-LF-Z operate with only ceramic output capacitors?

Yes-the MP1482DS-LF-Z is explicitly characterized for stability with low-ESR ceramic output capacitors (e.g., 10μF X5R/X7R). Its current-mode architecture and COMP-pin compensation tolerate wide ESR ranges, eliminating need for tantalum or electrolytic types in most applications.

How is the output voltage set, and what is the tolerance of the feedback reference?

Output voltage is set using a resistive divider from VOUT to FB, targeting the internal 0.923V reference. The reference has ±23mV (±2.5%) tolerance over temperature and line, yielding ≤±1% typical output accuracy with 1% resistors. R2 = 10kΩ is standard; R1 = (VOUT/0.923 − 1) × 10kΩ.

What happens during thermal shutdown, and how does recovery work?

At 160°C junction temperature, the internal thermal shutdown circuit disables both MOSFETs and holds COMP/SS low. Recovery occurs automatically once TJ falls below ~145°C hysteresis, re-enabling soft-start. No external reset is required, but repeated cycling indicates insufficient heatsinking or overload.

Is an external bootstrap diode required, and when?

An external Schottky diode (e.g., IN4148) from VOUT to BS is optional but recommended when duty cycle exceeds 65%-such as at VOUT = 3.3V with VIN > 5V. It improves high-duty-cycle efficiency by reducing BST capacitor discharge losses, though not mandatory for basic operation.

What is the maximum achievable output voltage, and what limits it?

The MP1482DS-LF-Z supports outputs up to 15V, limited by internal error amplifier headroom and maximum duty cycle (90%). At VIN = 18V, VOUT ≤ 16.2V theoretically, but datasheet specifies 15V max due to stability and regulation margin-exceeding this risks loss of control or FB pin saturation.

Does the MP1482DS-LF-Z support synchronization to an external clock?

No-the MP1482DS-LF-Z uses a fixed internal 340kHz oscillator with no external sync input. For synchronized multi-rail systems, designers must use alternative parts like MP2315 or MPQ4420A that provide SYNC pin functionality.