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Monolithic Power Systems Inc. MP3373GM
- Part No.:
- MP3373GM
- Manufacturer:
- Monolithic Power Systems Inc.
- Category:
- LED Drivers
- Package:
- 28-TSSOP (0.173", 4.40mm Width)
- Datasheet:
-
MP3373GM.pdf
- Description:
- IC LED DRIVER CTRLR PWM 28TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:1,554
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Product details
Overview
MP3373GM 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 features phase-shift PWM dimming to suppress inrush current and audible noise in TV/monitor backlight systems.
For engineers reviewing the MP3373GM datasheet, MP3373GM pinout, MP3373GM application, or MP3373GM equivalent, key selection criteria include its external N-MOSFET gate drive capability (10V VCC LDO), 8 independent CTLx/FBx current-sink control channels, OVP/short/open LED protection with FAULT flag output, and TSSOP-28 package thermal performance (θJA = 80°C/W).
Technical Context
The MP3373GM implements peak-current-mode, fixed-frequency boost conversion with internal 10V LDO (VCC) powering both gate driver and control circuitry. Its regulation loop uses FBx pins to sense string current via external resistors and CTLx pins to drive external transistors-enabling precise 200mV reference-based current control per channel.
It integrates fault management including open/short LED detection (via CTLx UVLO/OV thresholds), inductor/diode short protection (4-cycle latch on ISENSE > 430mV), over-voltage protection (2.5V trip, 3.0V latch), and thermal shutdown (150°C with 25°C hysteresis), all signaled via open-drain FAULT pin.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 9V to 40V - supports wide-range industrial and display power rails without pre-regulation |
| LED String Count | 8 independent channels - enables full backlight coverage for 4K+ LCD panels with distributed current sinks |
| Current Matching Accuracy | ±1.2% between strings - ensures uniform luminance across large-area displays without visible banding |
| Switching Frequency Range | 100kHz to 1MHz (ROSC-programmable) - allows optimization of inductor size, EMI, and efficiency trade-offs |
| VCC LDO Output | 10V ±1V @ 10mA - powers external MOSFET gate driver and internal logic; eliminates need for auxiliary supply |
| Fault Detection Outputs | Open/short LED, OVP, inductor/diode short, thermal shutdown - all reported via single FAULT pin with pull-down RFF = 20Ω |
| Dimming Modes | PWM (EN/PWM or DIM pin) and analog (0.4V–1.5V DC on DIM) - supports system-level brightness control flexibility |
| Phase Shift Resolution | 45° (8 active), 60° (6 active), or 90° (4 active) - reduces input/output ripple and acoustic noise in multi-string operation |
Pinout & Package
TSSOP-28 package (4.4mm × 9.7mm, 0.65mm pitch), thermally enhanced with exposed pad; rated for 1.56W continuous dissipation at TA = 25°C (θJA = 80°C/W).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 VIN | Power Input | 9–40V main supply input; requires local ceramic bypass to PGND |
| 2 VCC | LDO Output | 10V regulated supply for gate driver and internal circuitry; bypass to GND with ≥1μF ceramic |
| 5 EN/PWM | Enable & Dimming Input | Active-high enable; also accepts PWM signal for digital dimming control |
| 6 DIM | Analog/PWM Dimming Input | Accepts 0.4–1.5V DC for linear analog dimming or >1.6V PWM for digital dimming |
| 7–14, 16, 18, 20, 22 FB1–FB8 | Current Sense Feedback | Each connects to emitter resistor of external transistor; regulates string current to 200mV reference |
| 8–12, 14–15, 17, 19, 21 CTL1–CTL8 | External Transistor Control | Drives base/gate of external PNP/BJT or PMOS current sink; monitors for open/short faults |
| 23 FAULT | Fault Flag Output | Open-drain output pulled low during any fault condition (OVP, thermal, LED fault, etc.) |
| 24 OVP | Over-Voltage Protection Input | Connects to resistor divider from boost output; sets OVP threshold (2.5V nominal) |
| 26 ISENSE | Peak Current Sense | Detects inductor current for current-mode control and over-current protection |
| 27 GATE | External MOSFET Driver | Drives gate of external N-channel power MOSFET; 4Ω source / 2Ω sink impedance |
| 28 PSEN | Phase Shift Enable | Floating = phase shift enabled; tied to GND = disables phase shift (all strings switch simultaneously) |
Key Features
| Feature | Design Value |
|---|---|
| Programmable Switching Frequency | 100kHz–1MHz via single ROSC resistor - enables EMI-compliant layout and compact magnetics |
| 8-Channel Independent Current Regulation | Each string controlled by dedicated FBx/CTLx pair - supports mixed LED configurations and partial string disable |
| Phase-Shift PWM Dimming | Automatic 45°/60°/90° delay based on active string count - reduces input capacitor RMS current and eliminates coil whine |
| Integrated Fault Protection Suite | OVP latch (3.0V), thermal shutdown (150°C), LED open/short detection, and inductor/diode short - eliminates need for external monitoring ICs |
| Low 200mV Current Sense Threshold | Minimizes power loss in external current-setting resistors - improves overall system efficiency, especially at high currents |
| Expandable Architecture | Supports parallel operation of 2–3 MP3373GM units sharing one boost stage - scales to 16–24 LED strings without redesign |
Applications
| Large-Format LCD Backlighting | High-End Monitor Backlight |
|---|---|
Use Scenario: Driving 8 parallel strings of 10-series white LEDs in a 55-inch 4K LCD TV panel with dynamic local dimming zones. IC Role / Device Role / Timing Role: Primary WLED boost controller managing voltage headroom, string current regulation, and synchronized phase-shifted PWM dimming across all strings. Use Value: Achieves <1.2% luminance variation across panel while suppressing input ripple and eliminating audible noise during dimming transitions. | Use Scenario: Backlight for professional-grade 32-inch 1440p monitor requiring flicker-free dimming and color consistency under variable ambient lighting. IC Role / Device Role / Timing Role: Constant-current WLED driver with analog dimming interface and fault-flag reporting to host microcontroller for health monitoring. Use Value: Enables smooth 0–100% brightness control via 0.4–1.5V analog input while maintaining ±1.2% inter-string current match for uniform grayscale reproduction. |
| Commercial Digital Signage | Medical Imaging Display |
Use Scenario: 65-inch outdoor kiosk display operating 24/7 with wide temperature range (-30°C to +85°C ambient). IC Role / Device Role / Timing Role: Robust WLED controller with thermal shutdown, OVP latch, and open-string recovery - ensuring uninterrupted operation under harsh conditions. Use Value: Maintains backlight functionality even after single-string failure; FAULT pin alerts system controller for predictive maintenance before total failure. | Use Scenario: Diagnostic-grade medical monitor (e.g., PACS workstation) requiring DICOM-compliant grayscale linearity and zero flicker. IC Role / Device Role / Timing Role: Precision current regulator with <1.2% matching and phase-shifted PWM to eliminate temporal artifacts in static image viewing. Use Value: Guarantees consistent luminance across entire display area, critical for accurate radiological interpretation without visual fatigue. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar WLED boost controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MP3372GM | 6-channel version; identical architecture, same pinout except 2 fewer FB/CTL pairs; 1.2% matching, 9–40V input | Suitable only for ≤6-string designs; cannot scale to 8-string without additional ICs | Select when panel requires ≤6 LED strings and board space is constrained - shares layout compatibility but reduces channel count |
| RTQ2133GSP | Richtek 8-channel WLED controller; 5–26V input; integrated MOSFET drivers (no external transistors); 1.5% matching | Lower input voltage ceiling; no external transistor flexibility; higher quiescent current (1.2mA vs. 5mA) | Choose for cost-sensitive, lower-power (<26V) designs where external transistor control is unnecessary and integrated drivers suffice |
Compared with MP3372GM, MP3373GM provides two additional regulated channels and full 8-string scalability; versus RTQ2133GSP, it offers wider input range (up to 40V), external transistor control for higher current/voltage flexibility, and lower IQ - making it optimal for premium large-panel backlighting.
Availability
MP3373GM is available at Aetrix Electronics and suitable for large-format LCD backlighting, commercial digital signage, medical imaging displays, and high-end monitor applications requiring stable component supply, long-lifecycle support, and RoHS-compliant packaging.
Supply support for MP3373GM 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 product line targets high-efficiency, high-reliability WLED backlight controllers for premium flat-panel displays - emphasizing precision current matching, robust fault protection, and flexible dimming for next-generation visual systems.
FAQ
What is the function of the PSEN pin on MP3373GM?
The PSEN pin enables or disables the automatic phase-shift PWM dimming feature. When left floating, phase shifting is active - distributing turn-on timing across the 8 LED strings by 45° increments to reduce input ripple and eliminate audible coil noise. Pulling PSEN to GND disables phase shift, causing all strings to switch simultaneously. This pin has no effect outside PWM dimming mode.
How does MP3373GM handle an open LED string fault?
MP3373GM detects open strings by monitoring CTLx pin voltage: if a CTLx voltage falls below 170–240mV (UVLO threshold), the corresponding string is marked off. The controller then regulates output voltage using only the remaining active strings, maintaining backlight operation. The FAULT pin pulls low to signal the fault, and the part continues functioning unless all strings open.
Can MP3373GM drive MOSFETs directly, or does it require external transistors?
MP3373GM does not integrate power switches - it is a controller only. It drives external N-channel MOSFETs via the GATE pin (10V, 4Ω/2Ω drive strength) and controls external PNP BJTs or PMOS transistors via CTLx pins to regulate LED string current. This architecture enables high-voltage, high-current flexibility beyond integrated solutions.
What is the minimum recommended input capacitance for MP3373GM?
The datasheet recommends a 4.7μF X5R/X7R ceramic capacitor in parallel with a 220μF electrolytic capacitor at the VIN pin. This combination suppresses high-frequency switching noise and limits surge current drawn from the source. Ceramic capacitance must be placed as close as possible to VIN and PGND pins to ensure stability and EMI compliance.
How is LED string current set on MP3373GM?
String current is set by the resistor between each FBx pin and the emitter/source of its external transistor. With a 200mV internal reference, current is calculated as ILED ≈ 200mV / RFB × (β + 1), where β is the transistor's current gain. For example, RFB = 2Ω and β = 100 yields ~101mA per string. FB pins must never be left floating.
Does MP3373GM support daisy-chaining or synchronization with other MP3373GM units?
MP3373GM does not support clock synchronization or daisy-chaining. However, multiple units can operate in parallel sharing one boost power stage (VIN, inductor, diode, output cap) by connecting their ISENSE pins together and disabling phase shift (PSEN = GND). This extends total LED string count to 16 or 24 while maintaining independent current regulation per string.
What thermal derating applies to MP3373GM in TSSOP-28 package?
In TSSOP-28, MP3373GM has θJA = 80°C/W and maximum junction temperature of 150°C. At 25°C ambient, max continuous power dissipation is 1.56W. Derating begins above 25°C: for every 1°C rise in ambient, allowable power drops by 19.5mW. Adequate PCB copper area and thermal vias under the exposed pad are essential for sustained high-power operation.
MP3373GM Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Monolithic Power Systems Inc.
- Series:
- -
- Package/Case:
- 28-TSSOP (0.173", 4.40mm Width)
- Packaging:
- Tube
- 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-TSSOP
MP3373GM FAQ
1.How can I place an order for MP3373GM through Aetrix?
Please submit a Request for Quotation (RFQ) for MP3373GM 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 MP3373GM reliable?
The price and inventory of MP3373GM are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MP3373GM is usually 5 days.
3.What payment methods are accepted for MP3373GM?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MP3373GM transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MP3373GM?
MP3373GM orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MP3373GM 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 MP3373GM?
For technical support, including MP3373GM datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MP3373GM requirements.
6.How does Aetrix verify that MP3373GM is sourced from the original manufacturer or authorized distributors?
All MP3373GM 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 MP3373GM meets industry standards.
7.What is the process for return or replacement of MP3373GM?
All MP3373GM units undergo pre-shipment inspection (PSI). If there is an issue with MP3373GM, 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 MP3373GM part is unused and in its original packaging.
Return procedure for MP3373GM:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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