Monolithic Power Systems Inc. MP2483DS-LF-P

Overview

MP2483DS-LF-P from Monolithic Power Systems is a 55V, 2.5A white LED driver IC supporting buck, boost, and buck-boost topologies with programmable switching frequency (0.5–1.65 MHz), analog/PWM dimming on a single EN/DIM pin, and 0.198V feedback reference. It integrates a 0.28Ω internal MOSFET and delivers stable current regulation for LCD backlighting and automotive interior lighting under 4.5–55V input.

For engineers reviewing the MP2483DS-LF-P datasheet, MP2483DS-LF-P pinout, MP2483DS-LF-P application, or MP2483DS-LF-P equivalent, key selection criteria include its dual-mode topology support, open-string and short-circuit protection, thermal shutdown at 150°C, and compatibility with low-ESR ceramic output capacitors in SOIC14 packaging.

Technical Context

The MP2483DS-LF-P employs current-mode control with slope compensation to ensure loop stability across wide duty cycles (up to 90%) and input ranges (4.5–55V). Its error amplifier regulates LED current via a 0.198V FB reference, while cycle-by-cycle peak current limiting (3.0A) and fold-back frequency (250 kHz during fault) provide robust transient response and fault recovery.

It supports three operating modes: step-down (buck), inverting step-up/down (buck-boost), and step-up - selected by external component configuration. The EN/DIM pin accepts both DC voltage (0.7–1.4V for 0–100% dimming) and 100Hz–2kHz PWM signals (>1.4V amplitude), with INGND providing isolated reference for enable/dimming control in negative-rail applications.

Key Specifications

Pinout & Package

MP2483DS-LF-P is housed in a 14-pin SOIC package (body size 8.75mm × 4.00mm × 1.75mm) with exposed pad not connected internally; pins 1, 7, 8, and 14 are NC. Thermal resistance θ_JA = 86°C/W on 4-layer PCB.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar white LED driver applications.

Compared with LT3466-1 and TPS61165, MP2483DS-LF-P offers broader input range (55V), higher output current (2.5A), triple-topology flexibility, and comprehensive fault protection - making it suitable for demanding automotive and industrial LED systems where reliability and design reuse across platforms are critical.

Availability

MP2483DS-LF-P is available at Aetrix Electronics and suitable for automotive interior lighting, LCD backlight panels, handheld computers, and portable GPS devices requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.

Supply support for MP2483DS-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 MP2483 belongs to MPS's white LED driver product line, engineered for high-efficiency, multi-topology LED current regulation in automotive, industrial, and portable applications where input voltage variation and robust fault handling are critical.

FAQ

What is the maximum LED string voltage supported by MP2483DS-LF-P in buck-boost mode?

In buck-boost (inverting) configuration, the MP2483DS-LF-P supports LED string voltages up to 55V - limited by its 60V absolute maximum V_SW–V_SS rating. Practical string voltage depends on input rail and duty cycle; for example, with 12V input, up to 40V LED strings are achievable. Layout must minimize SW node parasitics to avoid voltage overshoot exceeding ratings.

Can MP2483DS-LF-P operate without an external bootstrap capacitor?

No. The BST pin requires a minimum 100nF ceramic capacitor connected between BST and SW to generate the gate drive voltage for the internal high-side MOSFET. Omitting this capacitor prevents proper switch turn-on, resulting in no output current and potential thermal stress on the IC due to prolonged linear operation.

How does open-string protection work, and what external components are needed?

Open-string protection uses the OVP pin: when the LED string opens, FB voltage drops near 0V, causing the controller to increase duty cycle until OVP pin voltage (set by external resistor divider) reaches 1.2V, triggering shutdown. A resistor divider from V_OUT to VSS is mandatory - e.g., 1MΩ from V_OUT to OVP and 100kΩ from OVP to VSS sets ~1.1V threshold.

What is the minimum recommended inductor value for MP2483DS-LF-P in step-down applications?

The datasheet recommends 1µH as the minimum inductor value for step-down operation. At 1.35MHz default frequency and 2.5A load, a 1µH inductor yields ~1.3A peak-to-peak ripple (52% of full scale), which is acceptable but increases conduction loss. For optimal efficiency and thermal performance, 4.7µH (e.g., Toko DS84LC-B1015AS-4R7N) is preferred, limiting ripple to ~30% of load current.

Does MP2483DS-LF-P support synchronization to an external clock?

No. The MP2483DS-LF-P does not support external clock synchronization. Its oscillator frequency is set solely by the RSET resistor (or defaults to 1.35MHz when open). For synchronized multi-channel LED systems, designers must use master-slave configurations with delayed enable signals or select alternative drivers with SYNC pin functionality.

Is the SOIC14 package of MP2483DS-LF-P RoHS-compliant and lead-free?

Yes. The "-LF" suffix in MP2483DS-LF-P explicitly denotes lead-free, RoHS-compliant packaging per EU Directive 2011/65/EU. All solderable terminations meet JEDEC J-STD-020 moisture sensitivity level 3 (MSL3) and are compatible with standard Pb-free reflow profiles (peak 260°C).

What is the purpose of the INGND pin, and can it be tied to VSS?

The INGND pin serves as the reference for the EN/DIM control signal, enabling true bipolar dimming control in buck-boost configurations where VSS may be at a different potential than the dimming source. It must not be tied to VSS unless the system uses only positive-referenced dimming signals - doing so risks latch-up or incorrect dimming response in inverting topologies.