Monolithic Power Systems Inc. MP2483DS-LF

Overview

MP2483DS-LF from Monolithic Power Systems is a 55V, 2.5A white LED driver IC operating in buck, boost, or buck-boost topologies with programmable switching frequency (0.5–1.65 MHz), 0.198V feedback reference, and integrated 0.28Ω MOSFET. It supports combined DC/PWM dimming on a single EN/DIM pin and delivers stable current regulation for LED strings in automotive interior lighting and portable display backlighting.

For engineers reviewing the MP2483DS-LF datasheet, MP2483DS-LF pinout, MP2483DS-LF application, or MP2483DS-LF equivalent, key selection criteria include its wide 4.5–55V input range, open-string and short-circuit protection, thermal shutdown, cycle-by-cycle current limiting, and compatibility with low-ESR ceramic output capacitors without minimum LED count requirement.

Technical Context

The MP2483DS-LF implements peak current-mode control with slope compensation to ensure stability across duty cycles up to 90%, enabling robust operation in both step-down and inverting buck-boost configurations. Its error amplifier integrates the difference between FB voltage and 0.198V reference to regulate LED current via internal MOSFET switching.

Dimming is implemented through analog voltage scaling (0.7–1.4V) or PWM (100Hz–2kHz) on the EN/DIM pin referenced to INGND, while OVP pin enables adjustable overvoltage shutdown (1.1–1.3V threshold) and foldback during short-circuit events. The device uses external RSET to set frequency and includes dedicated INGND and VSS pins for noise-isolated control signaling.

Key Specifications

Pinout & Package

MP2483DS-LF is housed in a 14-pin SOIC package with exposed pad (SOIC14), optimized for thermal dissipation in space-constrained LED driver designs. Pin functions are electrically identical to the QFN variant but mapped to dual-in-line layout for through-hole or surface-mount assembly.

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 uniquely supports buck/boost/buck-boost operation up to 55V and 2.5A with unified dimming control - making it the only option among the three capable of replacing multiple discrete drivers in multi-rail lighting systems.

Availability

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

Supply support for MP2483DS-LF 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.

The MP2483 belongs to MPS's white LED driver product line, engineered specifically for high-reliability, wide-input-range constant-current driving in automotive, industrial, and portable display applications.

FAQ

What is the maximum allowable LED string voltage for MP2483DS-LF in buck-boost mode?

In buck-boost (inverting) configuration, the maximum LED string voltage is limited by the 60V absolute maximum rating on VSW–VSS. With typical 2V forward drop per white LED, this supports up to 25–30 series LEDs depending on thermal derating. The OVP pin must be configured to shut down before exceeding safe operating area limits.

Can MP2483DS-LF drive RGB LED strings with independent current control?

No - MP2483DS-LF is a single-channel constant-current driver with one FB pin and one current-sense path. It cannot independently regulate red, green, and blue LEDs. For RGB control, three separate MP2483DS-LF units or a multi-channel LED driver IC would be required.

Does the MP2483DS-LF require an external bootstrap diode?

No - the MP2483DS-LF integrates bootstrap circuitry that charges the BST capacitor directly from SW during off-time. A 100nF or larger ceramic capacitor between BST and SW is sufficient; no external diode is needed or recommended.

How does open-string protection behave when multiple parallel LED strings are used?

Open-string protection triggers only if the total current through the sense resistor drops to near zero - meaning all parallel strings must fail open simultaneously. For redundancy, use a single sense resistor shared across all strings, as specified in the datasheet's Figure 4 application circuit.

What is the minimum recommended RSET resistor value, and what happens if it's too low?

The datasheet recommends RSET between 20kΩ and 150kΩ. Using <20kΩ risks exceeding the 1.65MHz upper frequency limit, potentially causing gate drive timing violations, reduced efficiency, and increased EMI. Frequencies above 1.65MHz are not characterized or guaranteed.

Is MP2483DS-LF compatible with PWM dimming frequencies above 2kHz?

No - the datasheet specifies 100Hz to 2kHz for linear dimming performance. Above 2kHz, dimming linearity degrades due to limited bandwidth of the internal current regulation loop; visible flicker may also occur if PWM period falls below human persistence of vision thresholds.

How does the INGND pin improve dimming accuracy compared to referencing EN/DIM to VSS?

INGND provides a dedicated low-noise reference for the EN/DIM comparator, isolating dimming control from high-current VSS switching noise. This prevents false triggering and ensures stable 0.7–1.4V analog dimming range even under heavy load transients - a key advantage in noisy automotive environments.