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Monolithic Power Systems Inc. MPQ3369GR-P
- Part No.:
- MPQ3369GR-P
- Manufacturer:
- Monolithic Power Systems Inc.
- Category:
- LED Drivers
- Package:
- 24-VFQFN Exposed Pad
- Datasheet:
-
MPQ3369GR-P.pdf
- Description:
- IC LED DRV RGLTR PWM 100MA 24QFN
- Quantity:
- Payment:
- Shipping:
Inventory:3,649
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Product details
Overview
MPQ3369GR-P from Monolithic Power Systems is a 6-channel boost white LED driver IC designed for LCD backlighting in tablets and notebooks. It integrates a 50V/100mΩ internal MOSFET, delivers up to 100mA per channel with ±2.5% current matching, supports 15000:1 PWM dimming ratio at ≤200Hz, and features I²C programmability, phase-shifted PWM dimming, and comprehensive fault protection including LED open/short, OVP, OTP, and OCP.
For engineers reviewing the MPQ3369GR-P datasheet, MPQ3369GR-P pinout, MPQ3369GR-P application, or MPQ3369GR-P equivalent, key selection considerations include its 3.5–36V input range, QFN-24 (4mm×4mm) package with exposed thermal pad, configurable switching frequency up to 2.2MHz, multi-dimming mode selection (PWM/analog/mix), and integrated current-source architecture for precise per-string regulation.
Technical Context
The MPQ3369GR-P employs peak-current-mode control for its step-up converter, using an internal 100mΩ/50V N-channel MOSFET switch and regulating output voltage via dynamic selection of the lowest active LEDx pin voltage. Its six independent current sinks connect to LED cathodes and are trimmed to ±2.5% matching across channels using a single external ISET resistor.
Dimming is implemented through three modes: direct PWM (15000:1 ratio), analog (200:1 ratio), and mix dimming (25% or 12.5% transfer point); all selectable via I²C register or MIX/AD pin voltage. Phase shift-60° for 6 channels, 90° for 4-is applied to stagger LED current pulses and suppress audible noise and EMI during PWM dimming.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 3.5V to 36V - supports wide-range DC power sources including automotive battery and industrial rails. |
| Max Output Current per Channel | 100mA - enables driving high-brightness WLED strings with up to 12-series configurations. |
| Current Matching Accuracy | ±2.5% - ensures uniform luminance across all 6 LED strings without external calibration. |
| PWM Dimming Ratio | 15000:1 at fPWM ≤ 200Hz - achieves deep dimming for high-contrast displays in low-light environments. |
| Switching Frequency | Configurable up to 2.2MHz - allows compact magnetics and reduced EMI via spread-spectrum (FSP pin) or external sync. |
| I²C Interface Speed | 400kHz Fast Mode - enables real-time configuration of dimming mode, protection thresholds, and channel enable/disable. |
| Thermal Shutdown Threshold | 170°C with 20°C hysteresis - provides robust overtemperature protection while maintaining operation up to +125°C junction. |
Pinout & Package
The MPQ3369GR-P is housed in a thermally enhanced QFN-24 package (4mm × 4mm, 0.5mm pitch) with an exposed AGND pad for efficient heat dissipation. Pin numbering follows standard top-view orientation with Pin 1 at top-left corner.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 DIM | PWM brightness control input | Accepts 100Hz–20kHz PWM signal; triggers cycle-by-cycle current modulation for direct PWM dimming. |
| 2 MIX/AD | Dimming mode selection | 18μA current-source pin; voltage level (≤0.3V / 0.5–0.8V / 1.0–1.3V) selects mix/PWM/analog dimming or floats for I²C control. |
| 3 FREQ/SYNC | Switching frequency configuration | Resistor-to-GND sets fSW; external clock input enables synchronization across multiple drivers. |
| 4 EN | Enable/disable control | Active-high logic; pulls internal circuitry into shutdown state (<1μA ISHDN) when low. |
| 5 SCL/PSE & 6 SDA/PSE | I²C interface + phase-shift enable | When tied together and pulled to 0.75–1.0V, activates phase-shift function; otherwise used for register access. |
| 9 ISET | LED current reference | Connects to GND via precision resistor (e.g., 24.9kΩ → 50mA/channel); sets full-scale current with 1.2V internal reference. |
| 11–16 LED1–LED6 | LED string cathode current sinks | Sink up to 100mA each; automatically detect and exclude grounded pins (e.g., LED6=GND disables Channel 6). |
| 18 SW | Internal MOSFET drain node | Connects to boost inductor; switches at up to 2.2MHz with 100mΩ RDS(on) and <100ns min on-time. |
| 19 OVP | Over-voltage protection threshold | Resistor divider from VOUT to GND programs OVP trip point (1.9–2.1V internal reference). |
| 24 VIN | Main power input | Supplies internal LDO (VCC) and boost converter; absolute max 42V; includes 3.1V UVLO with 100mV hysteresis. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated 50V/100mΩ MOSFET | Eliminates external high-voltage switch; reduces BOM count and PCB area while enabling >90% efficiency at 12V input. |
| Phase-shifted PWM dimming | Staggers LED channel activation (60° for 6 strings, 90° for 4) to reduce peak input current and eliminate audible coil whine. |
| Configurable LED short threshold | STH pin (18μA current source) allows setting short-detection voltage externally-critical for varying LED forward voltage tolerances. |
| Fault flag with open-drain FF pin | Single-pin indication of any active fault (OVP, OTP, LED open/short, inductor short); simplifies system-level monitoring. |
| Auto-decrement LED current at high temperature | Optional thermal foldback via register or STH pin-maintains safe operation without abrupt shutdown during sustained thermal stress. |
Applications
| Tablet LCD Backlighting | Notebook Display Backlight |
|---|---|
|
Use Scenario: Driving 6 parallel WLED strings (e.g., 6P12S) in a 10.1″–13.3″ LCD panel with dynamic local dimming support. IC Role / Device Role / Timing Role: Constant-current sink controller with I²C-configurable dimming mode, phase-shifted PWM timing, and real-time fault reporting via FF pin. Use Value: Enables 15000:1 contrast ratio in dark-room viewing while suppressing EMI through spread-spectrum switching and staggered channel activation. |
Use Scenario: High-efficiency backlight solution for ultrabook designs requiring thin profile, low heat generation, and seamless brightness transitions. IC Role / Device Role / Timing Role: Primary LED driver managing 4–6 strings with analog dimming (200:1) for smooth UI transitions and PWM dimming for video playback. Use Value: Delivers uniform luminance (±2.5% matching) and eliminates audible noise via 90° phase shift across 4 active channels. |
| Automotive Infotainment Display | Industrial HMI Panel |
|
Use Scenario: Backlighting for 7″–12″ automotive-grade TFT displays operating across -40°C to +125°C ambient range. IC Role / Device Role / Timing Role: Robust LED driver with OVP, OTP, LED open/short, and inductor short protection; supports auto-decrement current at high temperature. Use Value: Ensures fail-safe operation under load dump (42V transient) and thermal stress, meeting AEC-Q100 stress-test requirements. |
Use Scenario: Long-lifetime backlight for factory-floor HMIs exposed to vibration, dust, and wide input voltage fluctuations (e.g., 12–36V DC). IC Role / Device Role / Timing Role: Programmable WLED controller with I²C register access for field firmware updates and runtime dimming mode reconfiguration. Use Value: Simplifies design reuse across product variants via software-defined dimming behavior and protection thresholds. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar WLED driver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MPQ3367GR-A | 5-channel version; identical pinout except LED6 removed; same 15000:1 dim ratio and I²C interface. | Optimized for 5-string LED arrays; lacks sixth current sink but retains all protection and dimming features. | Select when exactly five LED strings are used-reduces cost and simplifies layout without sacrificing functionality. |
| RT9397BF | 6-channel boost WLED driver with 10000:1 dim ratio; no integrated MOSFET (external switch required); no phase-shift function. | Requires external 50V MOSFET and gate driver; supports only PWM and analog dimming-no mix dimming or spread spectrum. | Choose where board space permits discrete FET placement and lower integration is acceptable for cost-sensitive designs. |
Compared with MPQ3369GR-P, MPQ3367GR-A offers identical performance in a 5-channel footprint, while RT9397BF trades integration and advanced dimming for flexibility in high-voltage switch selection-but lacks phase shift, spread spectrum, and mix dimming capabilities critical for noise-sensitive displays.
Availability
MPQ3369GR-P is available at Aetrix Electronics and suitable for tablet backlighting, notebook display systems, automotive infotainment modules, and industrial HMI panels requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.
Supply support for MPQ3369GR-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 MPQ3369 belongs to MPS's high-dimming-ratio WLED driver product line, engineered specifically for energy-efficient, low-noise LCD backlighting in portable and automotive displays where precision current matching and flexible dimming control are essential.
FAQ
What is the maximum number of LEDs this driver can support per string?
The MPQ3369GR-P does not limit total LED count per string directly; instead, it regulates current based on the forward voltage headroom. With a 50V internal MOSFET and typical 3.2V–3.6V white LED VF, up to 12–15 series LEDs are feasible per string at 12V input, assuming sufficient VOUT margin above the highest string VF. The device dynamically adjusts VOUT to match the string requiring the most voltage.
Can the MPQ3369GR-P drive fewer than six LED strings?
Yes. Unused LEDx pins (e.g., LED6 for 5-string operation) can be tied to AGND to auto-disable that channel during startup, or disabled via the CH2:0 register bits. The IC automatically detects grounded pins and excludes them from regulation and phase-shift sequencing, ensuring optimal efficiency and thermal distribution across active channels.
How is the 15000:1 dimming ratio achieved in PWM mode?
This ratio is achieved by combining ultra-short minimum on-time (<7μs) with regulated output voltage clamping at 93% of the OVP threshold during deep dimming. At fPWM ≤ 200Hz, the IC maintains stable current regulation even at 0.0067% duty cycle (1/15000), enabled by precise current-sense amplifier response and cycle-by-cycle limiting.
Does the MPQ3369GR-P require an external Schottky diode?
No. The MPQ3369GR-P uses a synchronous boost topology with an integrated low-side N-channel MOSFET switch and does not require an external freewheeling diode. The internal switch replaces the diode, improving efficiency and eliminating reverse recovery losses and associated EMI.
What happens if the I²C bus is unavailable during startup?
The MPQ3369GR-P operates with default register settings-including MIX/AD pin-controlled dimming mode, factory-trimmed protection thresholds, and 400kHz switching frequency-so full functionality is retained without I²C initialization. I²C is optional for advanced configuration, not mandatory for basic operation.
Is the exposed thermal pad electrically connected internally?
Yes. The exposed pad is internally connected to AGND and must be soldered to a dedicated AGND copper pour on the PCB for both thermal performance and electrical integrity. Thermal vias (≥6×0.3mm) to inner-layer AGND planes are recommended to achieve θJA ≈ 42°C/W as specified.
How does the phase-shift function reduce audible noise?
By staggering the turn-on timing of LED current sinks (e.g., 60° apart for six channels), the phase-shift function distributes input capacitor ripple current over time rather than concentrating it at one instant per PWM cycle. This lowers peak current demand and eliminates mechanical vibration in inductors and capacitors that cause audible coil whine.
MPQ3369GR-P 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):
- 3.5V
- Voltage - Supply (Max):
- 36V
- Voltage - Output:
- 5V
- Current - Output / Channel:
- 100mA
- Frequency:
- 2.2MHz
- Dimming:
- Analog, PWM
- Applications:
- -
- Operating Temperature:
- -40°C ~ 125°C (TJ)
- Grade:
- Automotive
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 24-QFN (4x4)
MPQ3369GR-P FAQ
1.How can I place an order for MPQ3369GR-P through Aetrix?
Please submit a Request for Quotation (RFQ) for MPQ3369GR-P 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 MPQ3369GR-P reliable?
The price and inventory of MPQ3369GR-P are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MPQ3369GR-P is usually 5 days.
3.What payment methods are accepted for MPQ3369GR-P?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MPQ3369GR-P transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MPQ3369GR-P?
MPQ3369GR-P orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MPQ3369GR-P 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 MPQ3369GR-P?
For technical support, including MPQ3369GR-P datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MPQ3369GR-P requirements.
6.How does Aetrix verify that MPQ3369GR-P is sourced from the original manufacturer or authorized distributors?
All MPQ3369GR-P 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 MPQ3369GR-P meets industry standards.
7.What is the process for return or replacement of MPQ3369GR-P?
All MPQ3369GR-P units undergo pre-shipment inspection (PSI). If there is an issue with MPQ3369GR-P, 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 MPQ3369GR-P part is unused and in its original packaging.
Return procedure for MPQ3369GR-P:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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