Monolithic Power Systems Inc. MP24183DQ-LF-Z

Overview

MP24183DQ-LF-Z from Monolithic Power Systems is a 55V, 1A white LED driver IC supporting buck, boost, and buck-boost topologies with programmable switching frequency (250 kHz–1.35 MHz), 0.198 V feedback reference, and integrated 0.28 Ω MOSFET. It delivers precise constant-current LED regulation for LCD backlighting and portable lighting where input voltage varies from 4.5 V to 55 V.

For engineers reviewing the MP24183DQ-LF-Z datasheet, MP24183DQ-LF-Z pinout, MP24183DQ-LF-Z application, or MP24183DQ-LF-Z equivalent, key selection criteria include its dual dimming capability (analog/PWM on one pin), open-string and short-circuit protection, thermal shutdown, and compatibility with low-ESR ceramic output capacitors in space-constrained designs.

Technical Context

The MP24183 operates in current-mode control with slope compensation, enabling fast transient response and stable loop behavior across wide duty cycles. Its error amplifier integrates FB voltage error against 0.198 V reference to regulate peak inductor current, directly controlling LED current via external sense resistor.

Protection logic is tightly coupled to pin states: OVP pin monitors output overvoltage via external divider; EN/DIM pin serves as combined enable/dimming input with defined thresholds (0.6 V ON, 0.4 V OFF); INGND provides isolated ground reference for accurate dimming control in negative-output configurations.

Key Specifications

Pinout & Package

MP24183DQ-LF-Z is housed in a thermally enhanced 10-pin 3 mm × 3 mm QFN package with exposed thermal pad connected to VSS. The package supports high-power density layouts and requires solder paste stencil optimization for reliable thermal pad attachment.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MP24183DQ-LF-Z, MP2483DJ-LF-Z offers improved accuracy and efficiency with identical form factor and migration path, while LT3466-1EDD demands additional external components and sacrifices topology flexibility-making MP2483 the preferred upgrade for reliability and design simplicity.

Availability

MP24183DQ-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 despite its end-of-life status and documented migration path to MP2483.

Supply support for MP24183DQ-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 mixed-signal ICs for power management, LED lighting, and motor control applications.

The MP24183 belongs to MPS's white LED driver product line, engineered for compact, high-efficiency constant-current regulation in portable and automotive lighting where wide input range and integrated protection are critical.

FAQ

What is the recommended R_SET value to achieve 600 kHz switching frequency?

Per the MP24183 datasheet Figure on page 9, a 100 kΩ resistor from RSET to VSS yields approximately 600 kHz. Use a 1% metal-film resistor and place a 1 nF ceramic capacitor from RSET to VSS for noise immunity. Verify actual frequency with oscilloscope measurement at SW pin under load.

Can MP24183DQ-LF-Z drive multiple parallel LED strings without external current balancing?

No-MP24183 regulates total current through a single sense resistor. Driving parallel strings requires individual current-setting resistors per string or external current-mirror circuitry. For matched brightness, use series-connected LEDs or add per-string linear regulators like AP2125K.

How does the OVP pin behave during an open-LED fault?

During open-LED fault, FB voltage drops near 0 V while OVP pin voltage rises due to unregulated output. When OVP exceeds 1.2 V, the IC disables switching and enters hiccup mode-restarting only after OVP falls below 1.14 V (60 mV hysteresis) to prevent repeated stress.

Is the INGND pin required to be connected to system ground?

No-INGND is an isolated reference for EN/DIM signals and must be tied to the same potential as the dimming source's ground. In negative-output buck-boost designs, INGND may float above system ground to enable proper dimming signal referencing.

What is the maximum allowable duty cycle in buck mode?

The MP24183 supports up to 90% duty cycle in buck mode, enabling operation with input-to-output voltage ratios as low as ~1.1:1 (e.g., 12 V input → 11 V LED string). Exceeding this limit risks instability and reduced current regulation accuracy.

Does MP24183DQ-LF-Z support true 0% PWM dimming?

Yes-applying a 0% duty-cycle PWM signal (i.e., constant 0 V on EN/DIM) forces the IC into shutdown mode with 5 μA quiescent current. Full 0–100% dimming linearity is confirmed from 100 Hz to 2 kHz PWM frequency per datasheet Figure 11.

What thermal derating applies above +85°C ambient?

With θ_JA = 50 °C/W, maximum power dissipation decreases linearly: at 100°C ambient, PD_MAX = (150 − 100)/50 = 1.0 W. Maintain ≥2.5 cm² exposed copper under thermal pad and use 2+ internal ground planes to sustain 1 A output at elevated temperatures.