Monolithic Power Systems Inc. MP3320AGG-P

Overview

MP3320AGG-P from Monolithic Power Systems is a 4-channel, self-adaptive charge pump RGBW LED driver with I²C interface, operating from 1.8V to 5.5V input, delivering up to 51mA per channel and 5.5V output voltage. It supports independent 10-bit PWM + 8-bit analog dimming per channel, integrated phase-shifted PWM to suppress audible noise, and comprehensive protection (LED open/short, OVP, over-temperature). Used in compact wearable lighting and smart device indicators where precise multi-color control and low-noise operation are critical.

For engineers reviewing the MP3320AGG-P datasheet, MP3320AGG-P pinout, MP3320AGG-P application, or MP3320AGG-P equivalent, key selection considerations include its QFN-14 (2mm×2mm) package footprint, 400kHz I²C address configurability via ADR resistor, self-adaptive charge pump transfer rates (1x/1.5x/2x), 24ms LED fault detection latency, and simultaneous breathing light mode support across all four channels.

Technical Context

The MP3320AGG-P implements a self-adaptive charge pump architecture that dynamically selects 1x, 1.5x, or 2x voltage conversion based on real-time LED forward voltage headroom-minimizing power loss while maintaining regulation. Its dual-dimming engine applies independent 10-bit PWM (1.95kHz default) and 8-bit analog current control per channel, with configurable phase shift (0°/90°/120°/180°) to stagger LED turn-on edges and reduce peak inrush current.

Protection logic operates autonomously: LED open detection triggers after 24ms at <80mV V_LED, short detection responds to >3.0V at the LED pin for 24ms (or 100ms if all channels fault), and thermal shutdown activates at 150°C with 25°C hysteresis. Fault status is reported via dedicated register bits (FT_CHxO/FT_CHxS) readable over I²C without interrupt pins.

Key Specifications

Pinout & Package

MP3320AGG-P is housed in a thermally enhanced QFN-14 package (2mm × 2mm, 0.5mm pitch) with exposed thermal pad. Pin 1 is SDA; pin 14 is ADR. The layout separates power (VIN, OUT, CP, CN), LED current sinks (LED1–LED4), and I²C/programming signals (SDA, SCL, ADR) to minimize noise coupling.

Key Features

Applications

Equivalent & Alternatives

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

Compared with IS31FL3728-QFLS4-TR and TPS61194RGER, MP3320AGG-P uniquely combines self-adaptive charge pumping, dual 10-bit+8-bit dimming, and comprehensive fault protection in a 2mm×2mm package-making it optimal for space-constrained, battery-operated RGBW indicator systems requiring silent, efficient, and robust operation.

Availability

MP3320AGG-P is available at Aetrix Electronics and suitable for wearable devices, smart audio accessories, and portable medical indicators requiring stable component supply, consistent parametric performance across temperature, and long-term lifecycle support.

Supply support for MP3320AGG-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, including DC/DC converters, LED drivers, motor drivers, and battery management solutions.

The MP3320A product line targets ultra-compact, low-noise RGBW lighting in battery-powered consumer electronics-designed to replace discrete LED driver + boost converter combinations with a single integrated solution featuring intelligent adaptive regulation and I²C programmability.

FAQ

What is the minimum input voltage required for MP3320AGG-P to regulate all four channels at 20mA?

The MP3320AGG-P enters regulation when VIN exceeds the UVLO threshold of 1.8V (rising edge). At 20mA per channel with typical red (2.0V), green (3.2V), blue (3.2V), and white (3.2V) LEDs, the self-adaptive charge pump engages 1.5x mode starting at VIN ≥ 2.2V. Full 4-channel regulation is guaranteed from VIN = 2.5V onward per datasheet Figure 7 and electrical characteristics.

How does the phase-shift function reduce audible noise in PWM dimming?

Phase shift staggers the PWM rising edges across channels (e.g., 90° offset means LED4 turns on first, then LED3, LED2, LED1 sequentially). This distributes capacitor charging current over time instead of concentrating it at one instant-reducing peak inrush current by up to 40% and eliminating mechanical vibration in output capacitors and inductors that cause audible coil whine.

Can MP3320AGG-P drive LEDs with forward voltages exceeding 5.5V?

No. The internal over-voltage protection (OVP) triggers at 5.5V (rising edge) on the OUT pin, clamping further voltage rise. The maximum supported LED string voltage is therefore limited to 5.5V. For higher-V_F LEDs (e.g., 6V UV or specialty white), an external boost converter must supply VOUT, and MP3320AGG-P would operate in pure current-source mode with CLEDx = 1.

What happens during LED short protection activation, and how is it cleared?

When V_LEDx exceeds 3.0V for 24ms (per channel) or 100ms (all enabled channels), the SLP_MD[1:0] setting determines action: 01b sets FT_CHxS flag only; 10b disables the fault channel; 11b forces standby mode. Clearing requires writing SLP_MD[1:0] = 00b or 01b and issuing I²C command to reset fault bits-no power cycle needed.

Is the ADR pin required for basic operation, or can it be left unconnected?

ADR can be left floating to default to I²C address 0x6F (A3A2A1A0 = 1111), enabling immediate communication without external components. However, for multi-device systems, a precision resistor (e.g., 24kΩ ±1%) must be connected from ADR to GND to assign a unique address-floating ADR is acceptable only for single-IC applications.

Does MP3320AGG-P support true RGB color mixing, or is it limited to independent channel control?

It supports true RGBW mixing via independent 10-bit PWM + 8-bit analog control per channel. By synchronizing PWM periods and applying precise duty cycles (e.g., 60% red, 30% green, 10% blue), any hue within the gamut can be generated. Phase shifting ensures no temporal color separation, and current matching <0.75% guarantees consistent chromaticity across brightness levels.

What thermal derating applies above 25°C ambient temperature?

With θ_JA = 80°C/W on a 4-layer PCB, power dissipation must be reduced linearly above 25°C: P_D(MAX) = (150°C − T_A) / 80°C/W. At 70°C ambient, max continuous power drops to 1.0W (vs 1.56W at 25°C). Derating is enforced by internal thermal shutdown at 150°C junction temperature, with automatic recovery once die cools below 125°C.