Monolithic Power Systems Inc. MP3314GR-P

Overview

MP3314GR-P from Monolithic Power Systems is a 6-channel, 50V-rated boost white LED driver with integrated low-side MOSFET (150mΩ R_DS(ON)), I²C interface, and PWM/analog/mix dimming control. It delivers up to 60mA per channel with ±2% LED current accuracy at 20mA and supports adaptive V_OUT regulation up to 43V for LCD backlighting in tablets and notebooks.

For engineers reviewing the MP3314GR-P datasheet, MP3314GR-P pinout, MP3314GR-P application, or MP3314GR-P equivalent, key selection considerations include its 6-channel current matching (1.5% typ. in QFN-24), configurable switching frequency (312/625/1250kHz), FSS/EMI reduction features, thermal/LED open/short protection, and dual dimming control via I²C register or external PWM signal.

Technical Context

The MP3314GR-P implements peak current mode control with an internal 50V, 150mΩ low-side MOSFET and adaptive headroom regulation-monitoring minimum LED string voltage (V_{LEDx_MIN}) to dynamically adjust V_OUT in 10mV steps. Its 20MHz internal clock enables high-resolution 10-bit PWM dimming and supports mix dimming with programmable transfer point (25% default).

I²C-configurable parameters include switching frequency, dimming mode (analog/PWM/mix), phase shift across 6 channels, frequency spread spectrum (FSS) depth (±10% of f_SW), and slew rate control-enabling EMI optimization without external component changes. Protection logic includes latch-off OCP, LED open/short detection with auto-recovery, and thermal shutdown at 150°C with 20°C hysteresis.

Key Specifications

Pinout & Package

MP3314GR-P is housed in a thermally enhanced QFN-24 package (4mm × 4mm, 0.5mm pitch) with exposed pad tied to GND for optimal power dissipation (θ_JA = 42°C/W). Pin functions are validated per MPS Rev. 1.0 datasheet and match top-marking layout.

Key Features

Applications

Equivalent & Alternatives

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

Compared with RT8532GQW and ISL97693IRTZ, MP3314GR-P uniquely combines 6-channel precision current sourcing, adaptive V_OUT, and full I²C programmability in a single QFN-24 package-enabling higher efficiency, lower EMI, and tighter luminance uniformity in space-constrained portable displays.

Availability

MP3314GR-P is available at Aetrix Electronics and suitable for tablet backlighting, notebook display subsystems, and industrial HMI panels requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.

Supply support for MP3314GR-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 core expertise in DC/DC converters, LED drivers, and motor drivers for consumer, industrial, and automotive markets.

The MP3314 product line targets high-efficiency, digitally configurable backlight solutions for portable displays-designed to replace discrete boost + current-source architectures with integrated, thermally optimized, and EMI-conscious single-chip drivers.

FAQ

What is the maximum number of LEDs per string that MP3314GR-P can drive?

The MP3314GR-P supports up to 43V output voltage. Assuming typical white LED forward voltage of 3.2V–3.6V, it can reliably drive 11–13 LEDs in series per channel. At 12 LEDs × 3.4V = 40.8V, headroom remains within specification for stable regulation and thermal margin.

Does MP3314GR-P require external current-setting resistors for each channel?

No. MP3314GR-P uses a single ISET pin to configure LED current for all six channels simultaneously via one external resistor. Each channel's current is internally matched to ±1.5% (QFN-24), eliminating per-channel resistor placement and tolerance stacking errors.

How does the adaptive V_OUT regulation improve efficiency compared to fixed-output boost drivers?

Adaptive regulation monitors the lowest LED string voltage (V_{LEDx_MIN}) and adjusts V_OUT to maintain only 187.5mV headroom. This reduces power dissipation in the LED current sources by up to 15% versus fixed-output designs-especially beneficial at partial brightness or varying LED V_F across temperature.

Can MP3314GR-P operate without an I²C host controller?

Yes. MP3314GR-P supports standalone operation using external PWM dimming and resistor-based configuration (FSET, ISET). Default register values stored in OTP memory allow full functionality-including protection thresholds and dimming mode-without I²C initialization.

What thermal derating applies above 85°C ambient temperature?

With θ_JA = 42°C/W and T_J(MAX) = 150°C, maximum allowable power dissipation drops from 2.97W at 25°C to ~1.55W at 85°C. Derating follows PD_MAX = (150 − T_A) / 42. PCB copper area and airflow must be verified per JEDEC JESD51-7 4-layer standard to maintain safe junction temperature.

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

The FF pin is an open-drain N-channel MOSFET output. During normal operation, it remains high-impedance; during fault conditions (OVP, OCP, thermal shutdown, LED open/short), it pulls to GND. An external pull-up resistor (typically 10kΩ to VCC or system rail) is required for proper logic-level signaling.

What is the minimum PWM dimming frequency supported in mix dimming mode?

In mix dimming mode, the minimum effective PWM input frequency is 75Hz per the electrical specifications. Below this, the device may exhibit inconsistent dimming response or visible flicker; for critical medical or diagnostic displays, operation ≥120Hz is recommended to ensure flicker-free performance.