Monolithic Power Systems Inc. MP3304ADD-LF-P

Overview

MP3304ADD-LF-P from Monolithic Power Systems is a 36V, 1.3A step-up white LED driver with true PWM dimming up to 50kHz, fixed 2.2MHz switching frequency, and 200mV feedback voltage for high-efficiency current regulation in backlighting applications driving up to 10 parallel LED strings.

For engineers reviewing the MP3304ADD-LF-P datasheet, MP3304ADD-LF-P pinout, MP3304ADD-LF-P application, or MP3304ADD-LF-P equivalent, key selection considerations include open-load shutdown threshold (38V), internal 1.3A MOSFET switch, QFN8 (2×3mm) thermal performance, and PWM dimming compatibility with 250Hz–50kHz control signals.

Technical Context

The MP3304ADD-LF-P implements a constant-frequency, peak-current-mode boost converter architecture with integrated 0.4Ω power MOSFET and dedicated dimming switch (M2). It regulates LED current via external sense resistor using a precision 200mV reference, minimizing conduction loss.

Its protection suite includes under-voltage lockout (2.45V rising threshold), thermal shutdown at 150°C, and open-circuit detection triggering shutdown when output exceeds 38V - specific to the ADD variant - ensuring robust operation in variable-load backlight systems.

Key Specifications

Pinout & Package

MP3304ADD-LF-P is housed in an 8-pin QFN package (2mm × 3mm, 0.5mm pitch) with exposed thermal pad connected to GND for optimal heat dissipation. The package complies with JEDEC MO-229 VCED-2 and supports reflow soldering per IPC/JEDEC J-STD-020.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MP3302DJ-LF-Z and RT8532GQW, the MP3304ADD-LF-P delivers superior safety margin (38V OVP), fully integrated dimming path, and lower component count - making it optimal for compact, production-ready backlight modules where reliability and layout simplicity are critical.

Availability

MP3304ADD-LF-P is available at Aetrix Electronics and suitable for LCD panels, digital picture frames, handheld computers, and digital still cameras requiring stable component supply, RoHS-compliant packaging, and guaranteed long-term availability.

Supply support for MP3304ADD-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 mixed-signal ICs for power management, motion control, and automotive applications.

The MP3304 product line targets space-constrained, high-efficiency LED backlighting in portable consumer electronics, emphasizing integration, thermal robustness, and flicker-free dimming capability.

FAQ

What is the maximum number of white LEDs the MP3304ADD-LF-P can drive?

The MP3304ADD-LF-P supports up to 10 parallel strings of white LEDs. Each string may contain up to 9 LEDs in series (based on 36V output headroom and typical 3.2V forward voltage), enabling configurations like 9×10 or 3×10. Total current is limited by the 1.3A internal switch and thermal design.

Does the MP3304ADD-LF-P require an external Schottky diode?

Yes - the MP3304ADD-LF-P requires an external Schottky diode (e.g., B0540) connected between SW and LED+ to complete the boost converter topology. The diode must handle ≥500mA average current and support fast recovery to minimize switching losses at 2.2MHz.

How is LED current accuracy affected by temperature?

LED current accuracy remains within ±5% over –40°C to +85°C ambient, due to tight 200mV ISET reference tolerance (±7.5%) and low temperature coefficient of the internal error amplifier. External R_SET drift dominates residual error, so 1% metal-film resistors are recommended.

Can the MP3304ADD-LF-P operate from a 3.3V input?

No - the MP3304ADD-LF-P has a minimum input voltage of 3V but requires ≥3.5V for reliable startup and regulation when driving ≥6-series LED strings. At 3.3V input, output headroom drops significantly; use MP3304BDD (26V OVP) or bias-circuit variants for wider VIN ranges.

What is the purpose of the N/C pin (Pin 4)?

Pin 4 is a no-connect terminal - not internally bonded and electrically isolated. It must remain unconnected on the PCB. Routing traces or placing vias on this pad violates JEDEC land pattern guidelines and risks mechanical stress or solder bridging.

How does the 5ms disable timer function on the EN pin?

Holding EN ≤0.4V for ≥5ms triggers internal latching shutdown, disabling the SW gate driver and ISET current source. Recovery requires cycling VIN or pulling EN above 1.8V for >100ns. This prevents accidental turn-off from noise spikes shorter than 5ms.

Is the exposed thermal pad mandatory for operation?

Yes - the exposed pad (Pin 8) must be soldered to a solid GND copper pour. Without this connection, θ_JA degrades from 65°C/W to >120°C/W, causing premature thermal shutdown at ≤400mA load. Thermal vias under the pad are strongly recommended for production boards.