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Monolithic Power Systems Inc. MP3387LGRT-Z
- Part No.:
- MP3387LGRT-Z
- Manufacturer:
- Monolithic Power Systems Inc.
- Category:
- LED Drivers
- Package:
- 24-WFQFN Exposed Pad
- Datasheet:
-
MP3387LGRT-Z.pdf
- Description:
- IC LED DRV RGLTR PWM 45MA 24TQFN
- Quantity:
- Payment:
- Shipping:
Inventory:12,806
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Product details
Overview
MP3387LGRT-Z from Monolithic Power Systems is a 6-string white LED driver IC with step-up DC-DC conversion, analog+PWM mixed dimming, and ±3% current matching across strings. It delivers up to 45 mA per string from a 3–26 V input, regulates output up to 45 V, and operates in peak-current-mode PWM control. It is used in LCD backlighting for notebook PCs and mid-size displays requiring precise, low-noise brightness control.
For engineers reviewing the MP3387LGRT-Z datasheet, MP3387LGRT-Z pinout, MP3387LGRT-Z application, or MP3387LGRT-Z equivalent, this page provides verified technical context, real-world dimming behavior, thermal protection thresholds, package-specific layout guidance, and validated alternative options for display power management designs.
Technical Context
The MP3387LGRT-Z implements a peak-current-mode controlled boost converter with dual LX outputs (LX1/LX2) and six independent open-drain LED current sinks (LED1–LED6). Its internal 5 V LDO (VCC) powers gate drivers and logic, with UVLO at 2.55 V (200 mV hysteresis) and programmable switching frequency (532–1250 kHz via FREQ pin resistor).
Dimming is managed through a dual-mode architecture: when MIX = high (default), it uses 25% duty-cycle transfer point between analog dimming (≥25%) and high-frequency PWM dimming (24–27.5 kHz, upconverted from 100 Hz–20 kHz input); when MIX = low, it performs direct PWM dimming only. Protection includes recoverable OCP, OVP (programmable via resistor divider on OVP pin), OTP (150 °C shutdown, 20 °C hysteresis), and per-string open/short detection.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 3 V to 26 V - supports wide-range industrial and portable supply rails without external pre-regulation. |
| Max Output Voltage | 45 V - sufficient to drive up to 10 white LEDs in series per string under typical forward voltage conditions. |
| LED Current per String | Up to 45 mA - set precisely via external ISET resistor; typical 20 mA with 60.4 kΩ yields ±3% inter-string matching. |
| Current Matching Accuracy | ±3% - ensures uniform luminance across all 6 LED strings, critical for artifact-free LCD backlighting. |
| Dimming Frequency Range | 24 kHz to 27.5 kHz - eliminates audible noise during low-brightness operation by shifting PWM above human hearing range. |
| Thermal Shutdown Threshold | 150 °C with 20 °C hysteresis - enables safe recovery after transient overloads without latch-off behavior. |
| OVP Threshold Programmability | Adjustable via resistor divider on OVP pin (1.2 V reference) - allows tailored overvoltage protection aligned with system bus voltage margin. |
Pinout & Package
TQFN-24 (4 mm × 4 mm) package with exposed thermal pad connected to GND. Pin pitch is 0.5 mm; JEDEC MO-220 WGGD compliant. Requires tight PGND and AGND separation and short high-current LX–PGND loop routing per layout guidelines.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| EN (Pin 1) | Enable control input | Active-high logic enable with internal weak pull-down; must be ≥1.5 V to start operation. |
| FREQ (Pin 2) | Switching frequency programming | Resistor-to-GND sets oscillator frequency (e.g., 100 kΩ → 625 kHz); determines inductor size and efficiency trade-off. |
| MIX (Pin 4) | Dimming mode select | Pulled high by default for combined analog+PWM mode; pulled low for pure PWM dimming only. |
| PWMI (Pin 6) | PWM dimming signal input | Accepts 100 Hz–20 kHz input; IC auto-upconverts sub-25% duty cycles to 24–27.5 kHz for silent operation. |
| ISET (Pin 11) | LED current reference | 1.241 V reference drives external resistor; sets identical current in all 6 strings (e.g., 60.4 kΩ → 20 mA). |
| LED1–LED6 (Pins 9,10,12–15) | LED string cathode sinks | Open-drain current sources with 500 mV compliance voltage; minimize conduction loss in high-side LED configurations. |
| OVP (Pin 16) | Over-voltage protection monitor | Resistor-divider feedback node; triggers shutdown if output exceeds programmed threshold (e.g., 1.2 V = ~45 V at 37.5:1 divider). |
| LX1/LX2 (Pins 19,20) | Boost switch outputs | Internally paralleled N-MOSFET drains; require external inductor and Schottky diode; must be shorted externally. |
| VIN (Pin 23) | Main power input | Supplies entire IC; bypass with ≥4.7 μF ceramic capacitor; supports 3–26 V with UVLO at 2.55 V. |
| VCC (Pin 24) | Internal 5 V LDO output | Self-generated supply for gate drivers and logic; tied to VIN if input <5.5 V; drops to 0 V during shutdown. |
Key Features
| Feature | Design Value |
|---|---|
| 6-channel independent current regulation | Enables uniform backlighting across large-area LCD panels without external current mirrors or balancing resistors. |
| 25% dimming transfer point | Optimizes dynamic range: analog dimming above 25% preserves linearity and efficiency; PWM below 25% avoids flicker and audible noise. |
| Auto-upconverted PWM frequency | Converts user-supplied 100 Hz–20 kHz PWM into 24–27.5 kHz output, eliminating coil whine while maintaining full dimming ratio. |
| Per-string open/short fault detection | Monitors each LEDX pin voltage (e.g., <275 mV = open; >5.5 V = short) and disables faulty channel without affecting others. |
| Recoverable thermal shutdown | Shuts down at 150 °C and resumes operation once die cools by ≥20 °C - avoids system latch-up during thermal transients. |
Applications
| Notebook PC Backlight | Small LCD TV Backlight |
|---|---|
Use Scenario: Driving 6 parallel LED strings behind 13–15 inch LCD panels with variable ambient light adaptation. IC Role / Device Role / Timing Role: Primary step-up LED driver with integrated current regulation, mixed dimming control, and fault-safe shutdown. Use Value: Delivers consistent luminance uniformity (±3% string matching) and silent dimming (24–27.5 kHz) across battery- and adapter-powered operation. | Use Scenario: Powering 6-string white LED arrays in 22–32 inch consumer LCD TVs with local dimming zones. IC Role / Device Role / Timing Role: High-efficiency boost controller with programmable OVP and thermal foldback for long-life panel reliability. Use Value: Enables >10,000:1 dimming ratio using combined analog/PWM strategy while reducing EMI via fixed 625 kHz switching. |
| Handheld Terminal Display | Automotive Infotainment Display |
Use Scenario: Illuminating ruggedized industrial HMI screens operating in wide temperature (-40 °C to +85 °C) and vibration environments. IC Role / Device Role / Timing Role: Fault-tolerant LED driver with open/short string protection and UVLO hysteresis for stable startup under brownout. Use Value: Maintains backlight functionality despite single-string failure and survives automotive-grade load-dump transients via robust OVP design. | Use Scenario: Backlighting TFT-LCD clusters in automotive instrument panels and center consoles with ASIL-B functional safety requirements. IC Role / Device Role / Timing Role: Safety-aware LED controller with recoverable OTP, cycle-by-cycle OCP, and diagnostic-ready OVP reporting. Use Value: Supports fail-safe dimming transitions and meets AEC-Q100 Grade 2 (−40 °C to +105 °C) junction temperature limits without derating. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar white LED driver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MPQ3387G-AEC1 | AEC-Q100 qualified version with same pinout, 6-string topology, and mixed dimming; adds extended temp range (−40 °C to +125 °C) and enhanced ESD. | Required for automotive infotainment where qualification traceability and higher junction temperature tolerance are mandatory. | Select when automotive qualification, wider thermal margin, or production traceability are required; otherwise MP3387LGRT-Z offers identical performance at lower cost. |
| LM3409QMY/NOPB | Single-string buck-boost LED driver with external MOSFET; no integrated current sinks; requires separate string current control circuitry. | Suitable for flexible multi-topology designs but lacks native 6-string integration, increasing BOM count and PCB area. | Choose only if system requires discrete power stage control or non-standard LED configurations; not drop-in compatible due to topology and pinout mismatch. |
Compared with MP3387LGRT-Z, the MPQ3387G-AEC1 adds automotive qualification and thermal headroom but shares identical dimming architecture and regulation accuracy, while the LM3409QMY demands external current regulation and offers no native multi-string support - making MP3387LGRT-Z optimal for compact, high-integration LCD backlight systems.
Availability
MP3387LGRT-Z is available at Aetrix Electronics and suitable for notebook PC backlighting, small LCD TV power management, and automotive infotainment display systems requiring stable component supply, RoHS-compliant packaging, and long-term lifecycle continuity.
Supply support for MP3387LGRT-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 core expertise in DC-DC conversion, LED drivers, and motor control solutions.
The MP3387L product line targets mid-to-large LCD backlight applications, emphasizing high current matching, low-noise dimming, and comprehensive fault protection for reliable display illumination in portable and automotive environments.
FAQ
What is the minimum input voltage required for MP3387LGRT-Z to operate?
The MP3387LGRT-Z has an under-voltage lockout (UVLO) threshold of 2.55 V (±0.15 V) with 200 mV hysteresis. Operation begins only when VIN rises above 2.55 V; below that, the IC remains in shutdown with near-zero quiescent current (1 µA typical). This ensures stable startup across battery discharge profiles.
How does the MIX pin affect dimming behavior?
When MIX is pulled high (default), the IC uses combined analog+PWM dimming with a 25% duty-cycle transfer point: analog dimming above 25% preserves efficiency and linearity; PWM dimming below 25% shifts input frequencies to 24–27.5 kHz to eliminate audible noise. Pulling MIX low disables analog dimming entirely, forcing pure PWM operation at the input frequency.
Can MP3387LGRT-Z drive more than 6 LED strings?
No. The MP3387LGRT-Z integrates exactly six dedicated current-sink channels (LED1–LED6) with matched regulation circuitry. It cannot drive additional strings without external current mirrors or parallel ICs. Each string must connect directly to its assigned LEDx pin; sharing pins or cascading strings violates the internal current sensing architecture and voids regulation accuracy.
What is the purpose of the two LX pins (LX1 and LX2)?
LX1 and LX2 are internally paralleled drain terminals of the integrated N-channel MOSFET switch. They are provided to reduce current density and thermal stress at the bond wire level. External PCB layout requires shorting LX1 and LX2 together and connecting them to the same inductor and Schottky diode node - splitting them degrades efficiency and risks thermal imbalance.
How is over-voltage protection configured?
OVP is configured using a resistor divider from the boost output (VOUT) to the OVP pin, referenced to the internal 1.2 V threshold. For example, a 37.5:1 divider (e.g., 375 kΩ top, 10 kΩ bottom) sets OVP at ~45 V. If VOUT exceeds this threshold, switching halts until the OVP pin voltage falls below the recovery threshold (~1.12 V), enabling automatic fault recovery.
Does MP3387LGRT-Z support I²C or other digital interfaces?
No. The MP3387LGRT-Z is an analog-controlled LED driver with no digital communication interface. Dimming and configuration are handled exclusively through analog signals (PWMI, MIX, FREQ, ISET, OVP) and external passive components. All settings - including frequency, current, dimming mode, and protection thresholds - are resistor- or voltage-programmed.
What is the maximum allowable LED string voltage drop?
The MP3387LGRT-Z supports up to 45 V output, but the practical maximum string voltage depends on the LED forward voltage sum and the 500 mV LEDX regulation voltage headroom. With typical white LEDs at 3.2 V each, up to 13 LEDs per string (41.6 V) can be driven while maintaining 3.4 V margin for regulation stability and thermal derating.
MP3387LGRT-Z Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Monolithic Power Systems Inc.
- Series:
- -
- Package/Case:
- 24-WFQFN 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):
- 25V
- Voltage - Output:
- -
- Current - Output / Channel:
- 45mA
- Frequency:
- 1.25MHz
- Dimming:
- Analog, PWM
- Applications:
- Backlight
- Operating Temperature:
- -40°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 24-TQFN (4x4)
MP3387LGRT-Z FAQ
1.How can I place an order for MP3387LGRT-Z through Aetrix?
Please submit a Request for Quotation (RFQ) for MP3387LGRT-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 MP3387LGRT-Z reliable?
The price and inventory of MP3387LGRT-Z are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MP3387LGRT-Z is usually 5 days.
3.What payment methods are accepted for MP3387LGRT-Z?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MP3387LGRT-Z transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MP3387LGRT-Z?
MP3387LGRT-Z orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MP3387LGRT-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 MP3387LGRT-Z?
For technical support, including MP3387LGRT-Z datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MP3387LGRT-Z requirements.
6.How does Aetrix verify that MP3387LGRT-Z is sourced from the original manufacturer or authorized distributors?
All MP3387LGRT-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 MP3387LGRT-Z meets industry standards.
7.What is the process for return or replacement of MP3387LGRT-Z?
All MP3387LGRT-Z units undergo pre-shipment inspection (PSI). If there is an issue with MP3387LGRT-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 MP3387LGRT-Z part is unused and in its original packaging.
Return procedure for MP3387LGRT-Z:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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