Monolithic Power Systems Inc. MP2483DS-LF-Z

Overview

MP2483DS-LF-Z from Monolithic Power Systems is a 55V, 2.5A white LED driver IC supporting buck, boost, and buck-boost topologies with programmable switching frequency (0.5–3.5 MHz), analog/PWM dimming on a single EN/DIM pin, and integrated 0.28Ω MOSFET. It delivers stable current regulation (0.198V FB reference) for LCD backlighting and automotive interior lighting across 4.5–55V input.

For engineers reviewing the MP2483DS-LF-Z datasheet, MP2483DS-LF-Z pinout, MP2483DS-LF-Z application, or MP2483DS-LF-Z equivalent, key selection criteria include its dual-mode topology support, thermal/overcurrent/open-string protection, 5μA shutdown current, and SOIC14 package compatibility with high-voltage LED string designs requiring robust fault handling.

Technical Context

The MP2483DS-LF-Z implements current-mode control with slope compensation for stable operation across wide duty cycles (up to 90%) and input ranges (4.5–55V). Its error amplifier integrates feedback from a 0.198V reference to regulate LED current via external sense resistor, while cycle-by-cycle peak current limiting ensures safe 2.5A switching under transient loads.

It features dual dimming architecture: analog dimming via 0.7–1.4V EN/DIM voltage sweep (0–100% LED current), and PWM dimming using 100Hz–2kHz square waves >1.4V referenced to INGND. Open-string detection uses OVP pin threshold (1.2V) with 60mV hysteresis, and short-circuit foldback triggers at OVP <0.4V + FB <0.1V.

Key Specifications

Pinout & Package

MP2483DS-LF-Z is housed in a 14-pin SOIC package (body size 8.75mm × 4.00mm × 1.75mm) with exposed thermal pad connected internally to VSS. Pin 1 is marked by notch/dot; pins 1,7,8,14 are NC. The package supports standard reflow profiles and provides 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 MP2483DS-LF-Z, the AEC-Q100 variant adds automotive qualification overhead but identical functionality, while the LT3466 trades frequency flexibility and integrated dimming for broader vendor support and simpler biasing-making MP2483DS-LF-Z optimal for programmable, space-constrained, multi-topology LED systems.

Availability

MP2483DS-LF-Z is available at Aetrix Electronics and suitable for automotive interior lighting, LCD backlight panels, handheld computers, and portable GPS devices requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for MP2483DS-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, with core expertise in DC/DC conversion, LED drivers, and motor control solutions.

The MP2483 product line targets high-voltage, high-current LED illumination systems demanding topology flexibility, integrated protection, and compact packaging-designed specifically for automotive, industrial, and portable display applications.

FAQ

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

In buck-boost (inverting) configuration, the MP2483DS-LF-Z supports LED string voltages up to 55V minus the forward drop of the external Schottky diode and inductor DCR losses. With typical 0.4V diode drop and 0.1V IR loss, it reliably drives 7×3W white LEDs (≈35V total V_F) from a 5V input, as verified in Figure 4 of the datasheet.

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

No. The BST pin requires a minimum 100nF ceramic capacitor connected between BST and SW to generate the floating gate drive voltage for the internal high-side MOSFET. Omitting this capacitor causes immediate switch failure and loss of regulation, as confirmed in the PIN FUNCTIONS table (Pin 9 description) and Figure 3 schematic.

How does the MP2483DS-LF-Z handle open LED conditions in buck versus buck-boost topologies?

In buck mode, open LED raises FB voltage toward VSS, triggering OVP pin shutdown at 1.2V. In buck-boost mode, open LED pulls FB near 0V, causing duty cycle saturation until OVP reaches threshold-identical response per datasheet Section "Open LED Protection". Both modes disable switching and enter hiccup recovery after timeout.

What is the minimum recommended RSET resistor value, and what happens if it's below 20kΩ?

The datasheet recommends RSET ≥20kΩ to maintain stable operation above 1.3MHz. Using <20kΩ risks subharmonic oscillation and reduced loop phase margin, as shown in the RSET vs. f_SW curve on page 10. Values below 10kΩ may cause erratic switching or thermal instability due to excessive gate drive frequency.

Does MP2483DS-LF-Z support true 0–100% analog dimming linearly across the EN/DIM pin voltage range?

Yes-datasheet Figure 5 ("IWLED vs VEN") confirms linear 0–100% LED current scaling from 0.7V to 1.4V on EN/DIM referenced to INGND. Below 0.7V the device remains off; above 1.4V it delivers full 2.5A. This 0.7V offset prevents accidental dimming from noise or leakage currents.

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

Yes-the "-LF" suffix explicitly denotes lead-free, RoHS-compliant packaging per MPS Quality Assurance documentation. The device meets EU RoHS Directive 2011/65/EU and contains <1000ppm lead, with exemption 7a (lead in glass envelopes) not applicable to this surface-mount IC.