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Monolithic Power Systems Inc. MP3366GC-Z
- Part No.:
- MP3366GC-Z
- Manufacturer:
- Monolithic Power Systems Inc.
- Category:
- LED Drivers
- Package:
- 18-UFBGA, WLCSP
- Datasheet:
-
MP3366GC-Z.pdf
- Description:
- IC LED DRV RGLTR PWM 18WLCSP
- Quantity:
- Payment:
- Shipping:
Inventory:3,605
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Product details
Overview
MP3366GC-Z from Monolithic Power Systems is a 6-string, step-up white LED driver IC with integrated current sources, designed for LCD backlighting in tablets, notebooks, and terminal displays. It delivers up to 45mA per string, supports 3V–25V input, regulates output up to 45V, achieves ±1.5% inter-string current matching, and employs peak-current-mode PWM control at 600kHz.
For engineers reviewing the MP3366GC-Z datasheet, MP3366GC-Z pinout, MP3366GC-Z application, or MP3366GC-Z equivalent, key selection criteria include mixed analog/PWM dimming with 25% transfer point, audible-noise-free 23.5–29.5kHz dimming frequency, WLCSP-18 package thermal performance, and integrated open/short LED string protection.
Technical Context
The MP3366GC-Z implements a fixed-frequency (600kHz) peak-current-mode boost converter with six independent, open-drain LED current sinks. Each string is regulated by an internal 1.235V reference applied to the ISET pin, enabling precise current setting via external resistor.
Its dimming architecture dynamically switches between analog and PWM modes at 25% duty cycle: above 25%, analog dimming adjusts current amplitude; below 25%, PWM dimming operates at boosted 23.5–29.5kHz to eliminate audible noise while maintaining linear average brightness control.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 3V to 25V - supports direct battery or DC-DC rail inputs across portable and industrial display systems. |
| Max Output Voltage | 45V - sufficient to drive up to 12+ white LEDs in series per string under typical forward voltage conditions. |
| LED Current per String | Up to 45mA - configurable via ISET resistor; typical 20mA operation ensures thermal headroom and long LED life. |
| Current Matching Accuracy | ±1.5% - guarantees uniform brightness across all 6 strings without external calibration or trimming. |
| Switching Frequency | 600kHz - enables compact external magnetics and reduces output ripple without compromising efficiency. |
| Dimming Transfer Point | 25% PWM duty cycle - defines the boundary where dimming transitions from analog (low-noise, high-efficiency) to high-frequency PWM (deep dimming, no flicker). |
| OVP Threshold Range | Programmable 40–105mV UVLO hysteresis on OVP pin - allows robust open-string detection and overvoltage shutdown at user-defined output levels. |
Pinout & Package
MP3366GC-Z is housed in a WLCSP-18 package (1.35mm × 2.55mm), optimized for ultra-thin display modules with minimal PCB footprint and low thermal resistance (θJA = 70°C/W).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| EN | Enable control input | Active-high logic input with internal weak pull-down; initiates soft-start and full regulation when asserted. |
| PWM | Brightness control interface | Accepts 100Hz–20kHz PWM signal; internally rescales sub-25% duty cycles to 23.5–29.5kHz for silent operation. |
| ISET | Current reference node | Connects to ground via precision resistor; sets all six LED string currents identically using 1.235V internal reference. |
| LED1–LED6 | String current sink outputs | Open-drain NMOS terminals; each sinks up to 45mA with ≤500mV compliance voltage to minimize power loss. |
| OVP | Over-voltage sense input | Monitors boost output via resistor divider; triggers shutdown if voltage exceeds programmed threshold (e.g., open-string condition). |
| LX1/LX2 | Power switch outputs | Drains of internal N-MOSFETs; must be shorted externally to drive single inductor in standard boost topology. |
| PGND/AGND | Separate ground returns | PGND handles high di/dt switching current; AGND isolates sensitive analog circuitry to prevent noise coupling into current regulation loop. |
Key Features
| Feature | Design Value |
|---|---|
| Mixed dimming mode | Automatically selects analog or PWM dimming based on input duty cycle - preserves efficiency above 25% and eliminates audible noise below it. |
| Inter-string current matching | 1.5% accuracy across 6 strings - ensures consistent luminance without per-string current sensing or feedback compensation. |
| Integrated protection suite | Recoverable OCP, OVP, OTP, open-string, and short-string detection - enables robust field operation without external fault-handling circuitry. |
| Low-dropout current sinks | 500mV regulation voltage - reduces conduction loss by >30% vs. typical 1V+ LED drivers, improving thermal margin in space-constrained designs. |
| Internal 5V LDO (VCC) | Self-powered gate driver and control logic - eliminates need for external bias supply when VIN > 5.5V; simplifies BOM and layout. |
Applications
| Tablet Backlighting | Notebook Display |
|---|---|
Use Scenario: Driving 6 parallel LED strings behind 7–10 inch LCD panels with dynamic brightness control. IC Role / Device Role / Timing Role: Primary LED current regulator and boost controller; manages analog/PWM dimming transition and string-level fault isolation. Use Value: Enables uniform edge-lit backlighting with <1.5% brightness variation across display area and zero audible coil whine during video playback. | Use Scenario: Powering dual-zone or full-array LED backlights in 13–15 inch clamshell laptops with battery-sourced 3.3V–12V input. IC Role / Device Role / Timing Role: High-efficiency step-up LED driver with integrated thermal shutdown and open-string recovery for unattended operation. Use Value: Delivers stable 20mA/string current across temperature (-40°C to +85°C ambient) while maintaining <500mV dropout to extend battery runtime. |
| Industrial Terminal Display | Medical Diagnostic Monitor |
Use Scenario: Illuminating ruggedized 12–19 inch touchscreens used in factory HMIs with extended operating lifetime requirements. IC Role / Device Role / Timing Role: Fault-tolerant LED driver with programmable OVP and recoverable short-string protection for mission-critical visibility. Use Value: Prevents total backlight failure during partial LED string degradation; maintains ≥80% brightness with one open string via automatic re-regulation. | Use Scenario: Backlighting high-contrast, color-accurate diagnostic displays requiring flicker-free dimming down to 0.1% brightness. IC Role / Device Role / Timing Role: Precision current source with 25% dimming transfer point and 23.5–29.5kHz PWM frequency for clinical-grade visual stability. Use Value: Eliminates perceptible flicker and audible noise during prolonged low-brightness imaging sessions, meeting IEC 62368-1 safety and EMC requirements. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar 6-string LED driver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| RT9397BZSP | Fixed 500kHz switching frequency; 4-string max; no mixed dimming - uses PWM-only with 100Hz–20kHz range. | Limited to smaller panels; lacks open-string recovery and inter-string matching spec. | Select when cost sensitivity outweighs string count and dimming flexibility requirements. |
| ISL97693IRTZ-T7A | Supports 8 strings; includes I²C interface for digital dimming; higher 650kHz fSW; requires external VCC LDO. | Enables firmware-controlled brightness profiles but increases BOM count and layout complexity. | Choose for programmable multi-zone backlighting where host MCU coordination is available. |
Compared with RT9397BZSP and ISL97693IRTZ-T7A, the MP3366GC-Z uniquely balances 6-string capability, mixed dimming with audible-noise suppression, and WLCSP-18 footprint-making it optimal for space-constrained, high-reliability display backlighting where analog simplicity and fault resilience are prioritized.
Availability
MP3366GC-Z is available at Aetrix Electronics and suitable for tablet backlighting, notebook display systems, and industrial terminal displays requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.
Supply support for MP3366GC-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 expertise in DC-DC conversion, LED drivers, and motor control solutions.
The MP3366 product line targets mid-to-large LCD panel backlighting, emphasizing high integration, thermal efficiency, and robust fault handling in ultra-thin portable and industrial display applications.
FAQ
What is the minimum recommended ISET resistor value for MP3366GC-Z?
The ISET pin requires a resistor tied to ground to set LED current. With a nominal 1.235V reference, RSET = 1.235V / ILED. For 45mA maximum per string, RSET ≥ 27.4kΩ. Values below 20kΩ risk exceeding internal current source limits and degrading regulation accuracy.
How does MP3366GC-Z handle an open LED string during operation?
When one or more strings open, the MP3366GC-Z detects low voltage (<265mV) on affected LEDx pins and the OVP pin. It disables current regulation for those strings, maintains regulation on remaining strings, and resumes full operation automatically once the open condition is corrected-no reset required.
Can MP3366GC-Z operate with input voltage below 5.5V?
Yes. When VIN < 5.5V, the datasheet requires VIN and VCC pins to be tied together. The internal LDO is disabled, and the IC draws bias power directly from VIN. This configuration maintains full functionality including dimming and protection features.
What is the purpose of separate PGND and AGND pins on MP3366GC-Z?
PGND carries high di/dt switching current from LX pins and output rectifier, while AGND serves analog circuits (error amplifier, current sense, PWM comparator). Separating them prevents noise coupling into the current regulation loop, preserving ±1.5% matching accuracy and stable feedback response.
Does MP3366GC-Z support synchronization to an external clock?
No. The MP3366GC-Z uses an internal oscillator fixed at 600kHz and does not provide an external clock sync input. Frequency is set solely by internal design; no resistor or capacitor programming is required or supported.
What is the maximum allowable continuous power dissipation for MP3366GC-Z in WLCSP-18 package?
At TA = 25°C, the maximum continuous power dissipation is 1.7W, calculated from θJA = 70°C/W and TJ(MAX) = 150°C. Derating is required above 25°C ambient; at 85°C, maximum dissipation drops to ~0.93W to maintain safe junction temperature.
MP3366GC-Z Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Monolithic Power Systems Inc.
- Series:
- -
- Package/Case:
- 18-UFBGA, WLCSP
- 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):
- 25V
- Voltage - Output:
- 45V
- Current - Output / Channel:
- 45mA
- Frequency:
- 600kHz
- Dimming:
- Analog, PWM
- Applications:
- Backlight
- Operating Temperature:
- -40°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 18-WLCSP (1.35x2.55)
MP3366GC-Z FAQ
1.How can I place an order for MP3366GC-Z through Aetrix?
Please submit a Request for Quotation (RFQ) for MP3366GC-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 MP3366GC-Z reliable?
The price and inventory of MP3366GC-Z are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MP3366GC-Z is usually 5 days.
3.What payment methods are accepted for MP3366GC-Z?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MP3366GC-Z transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MP3366GC-Z?
MP3366GC-Z orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MP3366GC-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 MP3366GC-Z?
For technical support, including MP3366GC-Z datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MP3366GC-Z requirements.
6.How does Aetrix verify that MP3366GC-Z is sourced from the original manufacturer or authorized distributors?
All MP3366GC-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 MP3366GC-Z meets industry standards.
7.What is the process for return or replacement of MP3366GC-Z?
All MP3366GC-Z units undergo pre-shipment inspection (PSI). If there is an issue with MP3366GC-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 MP3366GC-Z part is unused and in its original packaging.
Return procedure for MP3366GC-Z:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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