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Monolithic Power Systems Inc. MP3373GY-Z
- Part No.:
- MP3373GY-Z
- Manufacturer:
- Monolithic Power Systems Inc.
- Category:
- LED Drivers
- Package:
- 28-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
MP3373GY-Z.pdf
- Description:
- IC LED DRIVER CTRLR PWM 28SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:2,788
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Product details
Overview
MP3373GY-Z from Monolithic Power Systems is an 8-channel step-up WLED controller with external transistor drive, designed for large LCD panel backlighting. It operates from 9V–40V input, delivers 1.2% current matching across strings, supports programmable 100kHz–1MHz switching frequency via ROSC, and integrates open/short LED protection with fault flag output for TV and monitor backlight systems.
For engineers reviewing the MP3373GY-Z datasheet, MP3373GY-Z pinout, MP3373GY-Z application, or MP3373GY-Z equivalent, key selection criteria include its external MOSFET gate drive capability (10V VCC LDO), phase-shift PWM dimming (45°–90° adjustable), 200mV CTLX regulation voltage, 8-channel FB/CTL pin pairing, and SOIC-28 package thermal performance (θJA = 60°C/W).
Technical Context
The MP3373GY-Z implements peak-current-mode, fixed-frequency boost control with internal 10V LDO powering gate driver and logic. Its eight independent current-sink channels use FB/CTL pairs to regulate external transistor bases, achieving ±1.2% string current matching via 200mV reference and low 200mV compliance voltage.
It features dual dimming modes-PWM (via EN/PWM or DIM pins) and analog (0.4V–1.5V DC)-with automatic phase-shift sequencing (45°/60°/90°) enabled by floating PSEN. Protection includes OVP latch-off at 3.0V, CTLX UVLO at 205mV, thermal shutdown at 150°C, and inductor/diode short detection over 4 cycles.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 9V to 40V - supports wide industrial and display power rails without pre-regulation |
| LED String Count | 8 channels - enables full-array local dimming for high-end LCD TVs and monitors |
| Current Matching Accuracy | ±1.2% - ensures uniform brightness across all backlight zones under varying thermal/load conditions |
| Switching Frequency Range | 100kHz to 1MHz - set by ROSC resistor; balances EMI, efficiency, and component size |
| CTLX Regulation Voltage | 320mV - defines base-emitter bias point for external NPN transistors in current sink configuration |
| Fault Flag Output | Open-drain FAULT pin - pulls low on OVP, thermal shutdown, or LED open/short events for system-level diagnostics |
| Thermal Shutdown Threshold | 150°C with 25°C hysteresis - prevents permanent damage while allowing recovery after cooling |
| Package Type | SOIC-28 - industry-standard footprint with 60°C/W junction-to-ambient thermal resistance |
Pinout & Package
MP3373GY-Z is housed in a 28-pin SOIC package (body width 7.5mm, pitch 1.27mm), optimized for thermal dissipation in high-power backlight applications. Pin layout supports full 8-channel feedback/control routing and dedicated protection monitoring.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 VIN | Power Input | 9V–40V main supply input; requires local ceramic bypassing |
| 2 VCC | LDO Output | 10V regulated supply for gate driver and internal circuitry; bypass to PGND |
| 5 EN/PWM | Enable & Dimming Input | Active-high enable; accepts PWM signal for global dimming control |
| 6 DIM | Analog/PWM Dimming Input | 0.4V–1.5V for linear analog dimming; >1.6V for PWM dimming |
| 7–14, 16, 18, 20, 22 FB1–FB8 | Current Sense Feedback | 200mV reference point per string; connects to emitter resistor of external transistor |
| 8–15, 17, 19, 21 CTL1–CTL8 | Transistor Base Control | 320mV-regulated sink output driving base of external NPN transistor per string |
| 23 FAULT | Fault Indicator | Open-drain output pulled low during OVP, thermal, or LED fault events |
| 24 OVP | Over-Voltage Monitor | Resistor-divider input for setting OVP threshold (2.5V typical trip) |
| 27 GATE | MOSFET Driver Output | 10V gate drive for external N-channel power switch; 4Ω source / 2Ω sink impedance |
| 28 PSEN | Phase Shift Enable | Floating enables automatic phase-shift dimming; tied to GND disables it |
Key Features
| Feature | Design Value |
|---|---|
| Programmable Switching Frequency | 100kHz–1MHz via single ROSC resistor - enables EMI optimization and compact magnetics selection |
| Phase-Shift PWM Dimming | Automatic 45°/60°/90° inter-string delay - reduces inrush current and eliminates audible coil noise |
| External Transistor Architecture | Separates high-voltage LED current handling from IC - improves thermal management and scalability |
| String Fault Management | Independent open/short detection per channel with auto-markoff - maintains operation of healthy strings |
| Shared Power Stage Scalability | Supports parallel ICs sharing one boost stage - extends channel count beyond 8 without duplicating magnetics |
Applications
| Large-Format LCD TV Backlight | Professional Monitor Local Dimming |
|---|---|
Use Scenario: Driving 8 parallel WLED strings (10 LEDs/string, 100mA each) in 55″+ LCD TV backlight with dynamic local dimming zones. IC Role / Device Role / Timing Role: Primary WLED current controller managing boost converter and per-string current regulation via external NPN transistors. Use Value: 1.2% current matching ensures uniform luminance across zones; phase-shift PWM eliminates flicker and acoustic noise during scene transitions. | Use Scenario: High-precision backlight for medical imaging and CAD monitors requiring consistent color gamut and minimal luminance deviation. IC Role / Device Role / Timing Role: Constant-current regulator with fault-flag reporting for system-level health monitoring and fail-safe shutdown. Use Value: Open/short LED protection and thermal shutdown prevent catastrophic failure; 200mV CTLX compliance minimizes power loss in high-current strings. |
| Commercial Digital Signage | Industrial HMI Display Backlight |
Use Scenario: 24/7 operation in kiosks and retail displays where reliability and thermal stability are critical. IC Role / Device Role / Timing Role: Robust step-up controller with extended temperature range (−40°C to +125°C junction) and latch-off OVP. Use Value: 3.0V OVP latch-off prevents overvoltage damage during LED string failure; SOIC-28 package supports conformal coating and long-term field reliability. | Use Scenario: Embedded human-machine interface in factory automation panels exposed to vibration, dust, and wide ambient temperature swings. IC Role / Device Role / Timing Role: Fault-tolerant WLED driver with FAULT pin interfacing to PLC or microcontroller for predictive maintenance alerts. Use Value: Inductor/diode short protection safeguards against mechanical stress-induced failures; 1μA shutdown current extends standby battery life. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar WLED controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MP3372GM-P | 6-channel version; identical architecture, same SOIC-28 package, but lacks PSEN pin and phase-shift capability | Suitable for mid-size displays (<40″) where fewer strings and no phase-shift dimming are acceptable | Select when channel count and acoustic noise requirements are relaxed; lower BOM cost due to reduced pin count |
| RTQ2132BGQW | Integrated MOSFET (no external transistor needed); 8-channel, but fixed 500kHz switching and no programmable OVP | Better for space-constrained designs where external FET layout is impractical, but less flexible for high-efficiency tuning | Prefer when board area is limited and thermal design allows integrated FET; avoid if OVP threshold customization or ultra-low-noise dimming is required |
Compared with MP3372GM-P, MP3373GY-Z adds two channels and phase-shift dimming for larger displays; versus RTQ2132BGQW, it trades integrated FET convenience for superior thermal management, programmability, and fault granularity in high-reliability backlight systems.
Availability
MP3373GY-Z is available at Aetrix Electronics and suitable for large-format LCD TV backlighting, professional monitor local dimming, and commercial digital signage requiring stable component supply, long-lifecycle support, and RoHS-compliant packaging.
Supply support for MP3373GY-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 analog and power ICs, with design centers in the US, China, and Taiwan, and global manufacturing partnerships.
The MP3373 belongs to MPS's WLED backlight controller product line, engineered specifically for high-channel-count, high-efficiency LCD panel illumination with emphasis on thermal resilience, fault tolerance, and EMI-controlled dimming.
FAQ
What is the function of the PSEN pin on MP3373GY-Z?
The PSEN pin enables or disables automatic phase-shift PWM dimming. When left floating, it activates inter-string phase delays (45° for 8 strings, 60° for 6, 90° for 4) to reduce inrush current and eliminate audible noise. Pulling PSEN to GND disables this feature, synchronizing all strings to the same PWM edge.
How does MP3373GY-Z achieve 1.2% current matching between LED strings?
It uses matched internal reference circuitry and precision 200mV FB pin regulation combined with 320mV CTLX sink voltage control. Each FB/CTL pair forms a closed-loop current sink with external NPN transistors, minimizing process and thermal drift across channels through on-die trimming and low-compliance-voltage design.
Can MP3373GY-Z drive LED strings directly without external transistors?
No. MP3373GY-Z is a controller-only IC and requires external NPN transistors (or N-channel MOSFETs with appropriate level-shifting) connected to CTLx pins to handle LED string currents. The IC provides only base/gate drive control and feedback regulation-not power switching.
What protection features are implemented in MP3373GY-Z?
It integrates LED open/short detection per string, inductor/diode short protection (triggered after 4 switching cycles), over-voltage protection with 3.0V latch-off, thermal shutdown at 150°C, and input UVLO with 200mV hysteresis. All faults assert the open-drain FAULT pin low for system-level response.
Is MP3373GY-Z compatible with both analog and PWM dimming?
Yes. It supports dual dimming modes: analog dimming via 0.4V–1.5V DC applied to the DIM pin (linear current control), and PWM dimming via signals applied to either EN/PWM or DIM pins (chopped current with duty-cycle proportionality). Phase-shift operation applies only in PWM mode.
What is the maximum recommended output voltage for MP3373GY-Z?
The IC itself does not define a hard maximum output voltage; instead, it relies on external OVP resistor divider. With standard configuration, OVP trips at 2.5V on the OVP pin, corresponding to ~100V output when using common 20:1 divider ratios. Final limit depends on external MOSFET and diode ratings, not the controller.
How does MP3373GY-Z handle unused LED channels?
Unused channels are disabled by connecting their corresponding CTLx pin to GND. During startup, the IC detects grounded CTL pins and automatically excludes those channels from the feedback loop and phase-shift sequencing-no software or register configuration is required.
MP3373GY-Z Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Monolithic Power Systems Inc.
- Series:
- -
- Package/Case:
- 28-SOIC (0.295", 7.50mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Type:
- DC DC Controller
- Topology:
- Step-Up (Boost)
- Internal Switch(s):
- No
- Number of Outputs:
- 8
- Voltage - Supply (Min):
- 9V
- Voltage - Supply (Max):
- 40V
- Voltage - Output:
- -
- Current - Output / Channel:
- -
- Frequency:
- 785kHz
- Dimming:
- PWM
- Applications:
- Backlight
- Operating Temperature:
- -40°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 28-SOIC
MP3373GY-Z FAQ
1.How can I place an order for MP3373GY-Z through Aetrix?
Please submit a Request for Quotation (RFQ) for MP3373GY-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 MP3373GY-Z reliable?
The price and inventory of MP3373GY-Z are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MP3373GY-Z is usually 5 days.
3.What payment methods are accepted for MP3373GY-Z?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MP3373GY-Z transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MP3373GY-Z?
MP3373GY-Z orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MP3373GY-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 MP3373GY-Z?
For technical support, including MP3373GY-Z datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MP3373GY-Z requirements.
6.How does Aetrix verify that MP3373GY-Z is sourced from the original manufacturer or authorized distributors?
All MP3373GY-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 MP3373GY-Z meets industry standards.
7.What is the process for return or replacement of MP3373GY-Z?
All MP3373GY-Z units undergo pre-shipment inspection (PSI). If there is an issue with MP3373GY-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 MP3373GY-Z part is unused and in its original packaging.
Return procedure for MP3373GY-Z:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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