Monolithic Power Systems Inc. MP3314GC-P

Overview

MP3314GC-P from Monolithic Power Systems is a 6-channel, 60mA/channel boost white LED driver with integrated 50V/150mΩ low-side MOSFET, I²C interface, and adaptive VOUT regulation for LCD backlighting in tablets and notebooks. It operates from 3V–30V input, delivers up to 43V output, and achieves ±2% LED current accuracy at 20mA with 1.5% channel matching (QFN-24) or 3% (CSP-20).

For engineers reviewing the MP3314GC-P datasheet, MP3314GC-P pinout, MP3314GC-P application, or MP3314GC-P equivalent, key selection criteria include I²C-configurable switching frequency (312/625/1250 kHz), phase-shifted multi-channel PWM dimming, frequency spread spectrum (FSS) for EMI reduction, OTP register defaults, and full fault protection including LED open/short, OVP, OCP, and thermal shutdown.

Technical Context

The MP3314GC-P implements peak current mode control with adaptive VOUT regulation-dynamically adjusting output voltage to match the lowest active LED string voltage plus programmable headroom (HEADR[2:0]) and hysteresis (CPHYST[1:0]). Its internal 20MHz clock enables high-resolution 10-bit PWM dimming and supports analog, PWM, and mixed dimming modes with configurable transfer point (DIMT[1:0]).

It integrates a 5V LDO (VCC) for gate drive and logic, uses external resistor programming (FSET, ISET) for fSW and ILEDx scaling, and features digital dithering to extend effective dimming resolution. Protection logic includes latch-off OCP, 1.8ms LED overvoltage fault timer, and 150°C thermal shutdown with 20°C hysteresis.

Key Specifications

Pinout & Package

MP3314GC-P is housed in a CSP-20 (2.4mm × 1.74mm) wafer-level chip-scale package with 20 terminals and an exposed pad connected to GND for thermal and electrical integrity.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar 6-channel WLED driver applications.

Compared with MP3314GR, MP3314GC-P trades 1.5% matching and 0.47W power dissipation headroom for 45% smaller footprint and thinner profile; versus RT8547GQW, it adds I²C configurability, adaptive regulation, and EMI-reduction features essential for premium portable displays.

Availability

MP3314GC-P is available at Aetrix Electronics and suitable for tablet backlighting, notebook display systems, small-size LCD instrumentation, and medical diagnostic displays requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.

Supply support for MP3314GC-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 expertise in DC/DC converters, LED drivers, motor drivers, and battery management solutions.

The MP3314 product line targets high-efficiency, space-constrained LCD backlight applications, emphasizing adaptive regulation, multi-channel synchronization, and robust fault protection for portable and automotive displays.

FAQ

What is the maximum LED string voltage supported by MP3314GC-P?

The MP3314GC-P regulates up to 43V on the VOUT pin, enabling it to drive up to 13 white LEDs in series (assuming 3.3V typical forward voltage). This limit is enforced by the over-voltage protection circuit, which triggers at 43V when OVP[2:0] = 111b and VOHL = 1b. Exceeding this voltage causes immediate latch-off shutdown.

How does the adaptive VOUT regulation improve efficiency?

Adaptive VOUT regulation continuously monitors the lowest active LED string voltage (VLEDx_MIN) and adjusts the boost output to maintain only the necessary headroom above it-programmed via HEADR[2:0] and CPHYST[1:0]. This avoids over-driving the boost converter, reducing conduction losses in the LS-FET and power diode, especially under partial-load or variable-temperature conditions.

Can MP3314GC-P operate without an external I²C controller?

Yes. The MP3314GC-P supports standalone operation using external PWM input and resistor-programmed settings (FSET, ISET). Default behavior is defined by OTP memory, and all protection functions remain fully active without I²C communication. I²C is optional for dynamic reconfiguration of dimming mode, frequency, or fault thresholds during runtime.

What thermal derating applies to the CSP-20 package?

The CSP-20 package has θJA = 50°C/W and a maximum continuous power dissipation of 2.5W at TA = 25°C. At 85°C ambient, usable power drops to ~1.75W. Derating is linear above 25°C; designers must ensure the exposed pad is soldered to a ≥40mm² thermal pad with ≥4 vias to internal ground planes to achieve rated performance.

Does MP3314GC-P support simultaneous analog and PWM dimming?

No-it supports three mutually exclusive dimming modes selected via I²C: analog (linear ILED amplitude vs. duty), PWM (fixed amplitude, variable duty), or mixed (analog above transfer point, PWM below). Mixed mode uses a single external PWM input and internally generates both analog and PWM components based on DIMT[1:0], eliminating need for dual control signals.

How is LED current matching affected by package choice?

LED current matching is 1.5% at 20mA for the QFN-24 package (MP3314GR) due to larger die attach area and lower thermal gradient, versus 3% for the CSP-20 (MP3314GC-P). This difference arises from tighter thermal coupling between channels in the smaller CSP, increasing sensitivity to localized heating during high-current operation.

What protection features activate during an LED short condition?

Upon LED short detection (VLEDx < 80mV UVLO threshold), the MP3314GC-P disables the affected channel's current sink, asserts the open-drain FF pin low, and continues operating remaining channels. If multiple shorts occur or VOUT exceeds 43V, OVP triggers and forces full latch-off shutdown until EN is cycled or I²C reset command issued.