Monolithic Power Systems Inc. MP3320BGG-P

Overview

MP3320BGG-P from Monolithic Power Systems is a 4-channel synchronous boost RGBW LED driver IC with I²C interface, designed for precise current regulation across red, green, blue, and white LED strings. It operates from 2V–5.5V input, delivers up to 102mA per channel, supports 10-bit PWM + 8-bit analog dimming, and integrates phase-shifted PWM to suppress audible noise in wearable and smart-device lighting systems.

For engineers reviewing the MP3320BGG-P datasheet, MP3320BGG-P pinout, MP3320BGG-P application, or MP3320BGG-P equivalent, this page provides verified technical context, validated pin functions, confirmed protection features (LED open/short, OVP, OTP), real-world dimming timing values, and direct substitution guidance for RGBW LED driver selection in space-constrained portable designs.

Technical Context

The MP3320BGG-P implements a peak-current-mode synchronous boost converter with adaptive output voltage regulation-selecting the lowest active LED forward voltage (VLEDx_MIN) as feedback reference-and configurable constant-voltage modes (4V/4.5V/5V). Its internal N-channel low-side MOSFET has 0.15Ω R_DS(ON) at 2.5V VIN, enabling high-efficiency operation under varying LED load conditions.

It combines independent per-channel control via I²C (400kHz compatible, 16 address options), dual dimming paths (8-bit analog current scaling + 10-bit PWM duty control), and hardware-enforced protections including 24ms-delay LED open detection (60–100mV threshold), 100ms all-channel short detection (3.3–3.7V threshold), and thermal shutdown at 150°C with 20°C hysteresis.

Key Specifications

Pinout & Package

MP3320BGG-P uses a thermally enhanced QFN-14 package (2mm × 2mm, 0.5mm pitch) with exposed thermal pad. Pin 1 is SDA; pin 14 is ADR. Ground pins (3, 11) and SW pins (9, 10) are placed for optimal PCB layout and thermal dissipation.

Key Features

Applications

Equivalent & Alternatives

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

Compared with IS31FL3731-QFLS4 and TPS61165DRVR, the MP3320BGG-P uniquely integrates synchronous boost, per-channel RGBW current regulation, I²C address flexibility, and phase-shifted PWM in a 2mm×2mm package-making it the only solution that simultaneously satisfies compact wearable form factor, multi-color fidelity, and low-noise operation requirements.

Availability

MP3320BGG-P is available at Aetrix Electronics and suitable for wearable devices, smart lighting interfaces, and portable medical instrumentation requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.

Supply support for MP3320BGG-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 power management ICs, with design centers in the U.S., China, and Taiwan.

The MP3320B product line targets space-constrained, battery-powered RGBW lighting applications-emphasizing integration, efficiency, and digital configurability to replace discrete LED driver solutions in consumer and medical electronics.

FAQ

What is the maximum total output power the MP3320BGG-P can deliver across all four channels?

The MP3320BGG-P does not specify total output power directly, but its thermal limit is defined by θ_JA = 80°C/W and T_J(MAX) = 150°C. At 25°C ambient, maximum continuous power dissipation is 1.56W. With typical 85% efficiency at 3.7V input and 5.4V output, maximum sustainable combined LED power is approximately 1.3W-enough for four 102mA channels at ~3.2V average V_F.

Can the MP3320BGG-P drive LEDs with forward voltages exceeding 5.4V?

No. The MP3320BGG-P's over-voltage protection (OVP) triggers at 5.0–5.8V, and its maximum regulated output voltage is 5.4V. Driving LEDs with total V_F >5.4V will cause OVP shutdown. For higher-V_F strings, use a driver with higher V_OUT rating such as the MPQ3367-AEC1 (16V max).

How does the adaptive output voltage mode reduce power loss compared to fixed CV mode?

In adaptive mode, the MP3320BGG-P regulates V_OUT to the minimum required value-VLEDx_MIN + 450mV headroom-rather than a fixed 4V/4.5V/5V. For example, if the lowest active LED string has V_F = 2.1V, V_OUT settles at ~2.55V instead of 4V, cutting boost converter power loss by over 50% and reducing thermal stress on the IC and inductor.

Is the FF (fault flag) pin actively driven or open-drain?

The FF pin is open-drain with an internal 13Ω pull-down when active. During normal operation, it remains high-impedance and must be pulled up externally (typically 10kΩ to VIN or IOVDD). When any fault occurs (LED open/short, OVP, OTP), FF is pulled low to indicate the condition-allowing wired-OR fault monitoring across multiple drivers.

What is the minimum PWM dimming pulse width supported, and how does it affect low-brightness control?

The minimum PWM pulse width is 1μs at f_PWM = 1.95kHz (FPWM[7:0] = 0x10). At this frequency, 1μs corresponds to ~0.2% duty cycle-enabling reliable dimming down to 0.2% of full scale. This allows precise sub-1% brightness control critical for ambient lighting and medical device UIs where subtle intensity gradients are required.

Does the MP3320BGG-P support hardware-based blinking without MCU intervention?

Yes. Blinking is fully hardware-implemented using dedicated registers (FBLK, DUTYBLK, BLK_TIMES). Once configured via I²C, the MP3320BGG-P autonomously generates blinking waveforms-including breathing effects-with no further host interaction. The IC handles timing, duty cycle, cycle count, and transition steps entirely in silicon.

How is LED current accuracy maintained across temperature and supply voltage variations?

LED current accuracy is specified as ±1% matching between channels at 25°C, with typical absolute accuracy of ±2.5% over –40°C to +125°C junction temperature and 2V–5.5V VIN. Internal bandgap reference and trimmed current-sense amplifier ensure stability; no external calibration is required for most consumer applications.