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Monolithic Power Systems Inc. MP3314GR-Z
- Part No.:
- MP3314GR-Z
- Manufacturer:
- Monolithic Power Systems Inc.
- Category:
- LED Drivers
- Package:
- 24-VFQFN Exposed Pad
- Datasheet:
-
MP3314GR-Z.pdf
- Description:
- 6-CHANNEL, 60MA, 50V, BOOST WLED
- Quantity:
- Payment:
- Shipping:
Inventory:3,989
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Product details
Overview
MP3314GR-Z 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 output voltage regulation up to 43V. It delivers ±2% LED current accuracy at 20mA per channel, supports analog/PWM/mix dimming, and targets LCD backlighting in tablets and notebooks requiring precise multi-string WLED control and EMI-reduced operation.
For engineers reviewing the MP3314GR-Z datasheet, MP3314GR-Z pinout, MP3314GR-Z application, or MP3314GR-Z equivalent, this page provides verified technical context on its peak-current-mode boost architecture, I²C-configurable switching frequency (312/625/1250 kHz), phase-shifted 6-channel timing, frequency spread spectrum (FSS), and OTP-register default configuration - all critical for backlight power integrity and thermal management in space-constrained portable displays.
Technical Context
The MP3314GR-Z implements peak-current-mode control with a fixed 20MHz internal clock, enabling high-resolution PWM dimming (up to 10-bit resolution with dithering) and configurable soft-start. Its adaptive VOUT regulation dynamically tracks the lowest LED string voltage (VLEDx_MIN) and adjusts output in discrete steps based on headroom (HEADR[2:0]) and hysteresis (CPHYST[1:0]) settings.
It integrates six matched current sinks (1.5% matching in QFN-24 package), supports three dimming modes (analog, PWM, mix) with programmable transfer point (DIMT[1:0]), and employs digital dithering plus configurable slew rate (SRSW[1:0]) and FSS (FSPR/FSPMF bits) to suppress conducted and radiated EMI without external filtering.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 3V to 30V - Enables direct integration with single-cell Li-ion (3.0–4.2V) or 5V/12V system rails without pre-regulation. |
| Max Output Voltage | 43V - Supports up to 10-series white LEDs (typ. 3.8V each) with margin for forward-voltage variation and temperature drift. |
| LED Current Accuracy | ±2% at 20mA - Ensures consistent brightness across channels and units, critical for uniform display luminance. |
| Switching Frequency | 312/625/1250 kHz - Selectable via I²C or FSET resistor; higher frequencies reduce inductor size but increase switching loss. |
| Current Matching | 1.5% (QFN-24) - Minimizes inter-string current deviation, eliminating visible brightness banding in edge-lit LCDs. |
| Dimming Resolution | 10-bit (with dithering) - Achieves >1000:1 contrast ratio in mix/analog dimming, supporting HDR backlight zoning. |
| OVP Threshold | Configurable 21V or 43V - Prevents overvoltage damage during open-circuit LED failure or cold-start surge conditions. |
Pinout & Package
MP3314GR-Z uses a thermally enhanced QFN-24 (4mm × 4mm, 0.5mm pitch) package with exposed pad tied to GND for efficient heat dissipation in compact backlight modules.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 2 SW | Low-side MOSFET drain | Connects to boost inductor; handles peak currents up to 1.1A; requires low-inductance layout to minimize ringing. |
| 3, 4 PGND | Power ground | Dedicated high-current return path for SW and LED strings; must be routed separately from signal GND to avoid noise coupling. |
| 5 SDA | I²C data I/O | Open-drain bidirectional interface; requires 2.2kΩ pull-up to VCC for standard-mode (100kHz) or fast-mode (400kHz) operation. |
| 6 SCL | I²C clock input | Drives synchronous communication; timing compliant with I²C spec (tLOW ≥ 0.5μs, tHIGH ≥ 0.26μs). |
| 7 EN | Enable control | Active-high logic input; RC filter recommended to prevent false turn-on during power ramp; 1.2V threshold ensures robust noise immunity. |
| 8 FF | Fault flag output | Open-drain indicator pulled low on OVP, OCP, thermal shutdown, or LED open/short - enables system-level fault logging. |
| 9 PWM | External dimming input | Accepts 75Hz–25kHz PWM signal; 1.2V high threshold and 0.4V low threshold support standard microcontroller GPIO outputs. |
| 10, 11, 15, 24 GND | Signal ground | Reference for logic, analog, and I²C circuits; connects to PCB ground plane under exposed pad for thermal and EMI performance. |
| 12–18 LED1–LED6 | LED string cathode terminals | Each drives one WLED string with 60mA max; internal current sources eliminate need for external sense resistors. |
| 19 VCC | 5V LDO output | Supplies internal gate driver and logic; requires 1μF ceramic capacitor near pin to stabilize under dynamic load. |
| 20 VOUT | Output voltage feedback | Monitors boost output; connects to diode cathode; used for adaptive regulation and OVP detection. |
| 21 FSET | Frequency/dimming setting | Resistor-to-GND sets fSW and fPWM; enables precise EMI tuning without firmware changes. |
| 22 VIN | Main power input | Accepts 3–30V; bypassed with ≥10μF ceramic capacitor close to pin to suppress input ripple and transients. |
| 23 ISET | LED current reference | Resistor-to-GND sets full-scale current (e.g., 60kΩ = 20mA); enables board-level calibration without I²C programming. |
Key Features
| Feature | Design Value |
|---|---|
| Adaptive VOUT Regulation | Automatically minimizes headroom voltage by tracking lowest VLEDx string, reducing power loss and thermal stress by up to 15% vs. fixed-output designs. |
| Phase-Shifted Channel Timing | Staggered 6-channel switching reduces input/output ripple current peaks by >70%, easing capacitor sizing and lowering EMI filter cost. |
| Configurable Frequency Spread Spectrum | FSS range adjustable to ±5% or ±3.125% of fSW with modulation frequency down to fSW/200 - suppresses narrowband EMI peaks without sacrificing efficiency. |
| OTP Register Default Storage | One-time programmable memory retains I²C register defaults (e.g., dimming mode, OVP threshold) after power cycle - eliminates boot-time configuration overhead. |
| Mixed Dimming Mode | Combines analog dimming above 25% duty and PWM below it, delivering smooth low-brightness control while maintaining high contrast ratio and avoiding flicker. |
Applications
| Tablet Backlighting | Notebook Display |
|---|---|
|
Use Scenario: Driving 6 parallel LED strings behind a 10.1-inch IPS LCD panel with 10-series white LEDs per string. IC Role / Device Role / Timing Role: Primary boost LED driver providing synchronized current regulation, adaptive VOUT, and I²C-based brightness scaling via OS-level backlight API. Use Value: Delivers uniform luminance (<1.5% inter-string mismatch) and <10ms brightness transition time, meeting VESA DisplayHDR400 timing requirements. |
Use Scenario: Powering dual-zone edge-lit backlight in a 14-inch ultrabook with independent top/bottom brightness control. IC Role / Device Role / Timing Role: Dual-string controller using LED1–LED3 for top zone and LED4–LED6 for bottom zone, coordinated via I²C register writes. Use Value: Enables local dimming zones with <5% brightness step resolution and phase-shifted switching to reduce audible coil whine during video playback. |
| Small-Size LCD Displays | Industrial HMI Panels |
|
Use Scenario: Backlighting a 7-inch resistive-touch LCD in medical handheld device operating from 3.7V Li-ion battery. IC Role / Device Role / Timing Role: Single-supply WLED driver with UVLO (2.5V) and thermal shutdown (150°C) ensuring safe operation during battery discharge and enclosure heating. Use Value: Maintains >85% efficiency at 3.7V input and 20mA/channel, extending battery runtime by 12% vs. non-adaptive boost drivers. |
Use Scenario: Illuminating a 5.7-inch ruggedized LCD in factory automation panel exposed to -40°C to +85°C ambient. IC Role / Device Role / Timing Role: Robust LED driver with -40°C to +125°C junction rating, LED open/short protection, and 2kV HBM ESD tolerance on all pins. Use Value: Guarantees uninterrupted backlight operation during voltage transients and temperature cycling, eliminating field failures due to LED string faults. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar 6-channel WLED driver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| RT8542GSP | 4-channel, 40mA/channel; no I²C; analog-only dimming; 36V max VOUT | Lacks multi-channel phase shift, FSS, and mix dimming - suitable only for simpler, lower-power displays. | Select when cost sensitivity outweighs dimming flexibility and EMI performance requirements. |
| ISL97686IRTZ-T7A | 6-channel, 50mA/channel; I²C interface; 40V max VOUT; no adaptive VOUT or OTP memory | Requires external VOUT feedback resistor network; lacks headroom optimization and default register storage. | Choose if legacy I²C register map compatibility is required and adaptive regulation is not needed. |
Compared with RT8542GSP and ISL97686IRTZ-T7A, MP3314GR-Z uniquely combines 60mA/channel capability, adaptive VOUT headroom control, OTP-configurable defaults, and integrated FSS - delivering superior efficiency, EMI compliance, and firmware-light deployment in next-gen portable displays.
Availability
MP3314GR-Z is available at Aetrix Electronics and suitable for tablet backlighting, notebook display systems, and small-size LCD panels requiring stable component supply, long-term lifecycle assurance, and RoHS-compliant packaging.
Supply support for MP3314GR-Z 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 focus on efficiency, integration, and thermal robustness for portable and industrial applications.
The MP3314 belongs to MPS's WLED backlight driver product line, engineered specifically for high-resolution, energy-efficient LCD backlighting in space-constrained consumer electronics where precision current matching and EMI control are mandatory.
FAQ
What is the maximum number of LEDs per string supported by MP3314GR-Z?
The MP3314GR-Z supports up to 10 white LEDs in series per channel, based on its 43V maximum output voltage and typical forward voltage of 3.8V per LED at 20mA. At higher currents or elevated temperatures, the practical limit may reduce to 9 LEDs to maintain sufficient headroom and thermal margin.
Does MP3314GR-Z require external current-sense resistors for LED regulation?
No. The MP3314GR-Z integrates six precision current sources with internal feedback; LED current is set solely by the external resistor on the ISET pin (e.g., 60kΩ for 20mA) and configured via I²C registers. No external sense resistors are needed, reducing BOM count and PCB area.
How does the adaptive VOUT regulation improve system efficiency?
Adaptive VOUT regulation continuously monitors the lowest LED string voltage and adjusts the boost output to maintain only the necessary headroom (configurable 187.5mV minimum). This reduces power dissipation in the internal current sources by up to 15% compared to fixed-output drivers, directly lowering thermal load and improving overall efficiency.
Can MP3314GR-Z operate with only I²C control, without an external PWM signal?
Yes. The MP3314GR-Z supports full brightness control via I²C alone - including dimming mode selection (analog/PWM/mix), duty cycle, frequency, and transfer point. The PWM pin can be tied to GND if external PWM is unused, and the device will ignore it while executing I²C commands.
What thermal derating applies to MP3314GR-Z in QFN-24 package at 85°C ambient?
With θJA = 42°C/W, the maximum continuous power dissipation at 85°C ambient is (150°C − 85°C) / 42°C/W = 1.55W. At full load (6 × 60mA, 43V VOUT), power dissipation exceeds this; therefore, derating to ≤40mA/channel or adding copper pour under the exposed pad is required to sustain operation at 85°C ambient.
Is the I²C interface compatible with standard 3.3V microcontrollers?
Yes. The MP3314GR-Z's SDA/SCL pins accept logic-high inputs up to 1.26V (QFN-24), well within the 3.3V microcontroller's VOH specification. A 2.2kΩ pull-up to 3.3V is recommended, and the device supports standard-mode (100kHz) and fast-mode (400kHz) I²C timing without level shifting.
What protection features activate during an LED open-circuit fault?
Upon LED open detection, the MP3314GR-Z disables the affected channel, pulls the FF pin low, and maintains regulation on remaining channels. It does not latch off - recovery occurs automatically once the open condition is removed and VOUT stabilizes, ensuring graceful degradation rather than full system shutdown.
MP3314GR-Z Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Monolithic Power Systems Inc.
- Series:
- -
- Package/Case:
- 24-VFQFN Exposed Pad
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Type:
- DC DC Regulator
- Topology:
- Step-Up (Boost)
- Internal Switch(s):
- Yes
- Number of Outputs:
- 6
- Voltage - Supply (Min):
- 3V
- Voltage - Supply (Max):
- 30V
- Voltage - Output:
- 43V
- Current - Output / Channel:
- 60mA
- Frequency:
- 312kHz, 625kHz, 1.25MHz
- Dimming:
- Analog, I2C, PWM
- Applications:
- Backlight
- Operating Temperature:
- -40°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 24-QFN (4x4)
MP3314GR-Z FAQ
1.How can I place an order for MP3314GR-Z through Aetrix?
Please submit a Request for Quotation (RFQ) for MP3314GR-Z on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.
2.Are the price and stock information for MP3314GR-Z reliable?
The price and inventory of MP3314GR-Z are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MP3314GR-Z is usually 5 days.
3.What payment methods are accepted for MP3314GR-Z?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MP3314GR-Z transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MP3314GR-Z?
MP3314GR-Z orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MP3314GR-Z order is processed, you will receive an email with the shipment details and tracking number.
Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.
5.How can I obtain technical support or documentation for MP3314GR-Z?
For technical support, including MP3314GR-Z datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MP3314GR-Z requirements.
6.How does Aetrix verify that MP3314GR-Z is sourced from the original manufacturer or authorized distributors?
All MP3314GR-Z products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that MP3314GR-Z meets industry standards.
7.What is the process for return or replacement of MP3314GR-Z?
All MP3314GR-Z units undergo pre-shipment inspection (PSI). If there is an issue with MP3314GR-Z, returns or replacements are accepted under the following conditions:
1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.
2.The issue is reported within 90 days of delivery.
3.The MP3314GR-Z part is unused and in its original packaging.
Return procedure for MP3314GR-Z:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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