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Monolithic Power Systems Inc. MP3388DR-LF-P
- Part No.:
- MP3388DR-LF-P
- Manufacturer:
- Monolithic Power Systems Inc.
- Category:
- LED Drivers
- Package:
- 24-VFQFN Exposed Pad
- Datasheet:
-
MP3388DR-LF-P.pdf
- Description:
- IC LED DRVR RGLTR PWM 20MA 24QFN
- Quantity:
- Payment:
- Shipping:
Inventory:2,453
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Product details
Overview
MP3388DR-LF-P from Monolithic Power Systems is an 8-channel white LED driver IC with integrated step-up converter, designed for LCD panel backlighting in large-format displays. It delivers up to 50V output from 4.5–25V input, regulates 20mA per string with ±3% matching accuracy, and supports selectable 1.25MHz/625kHz switching frequency. Used in notebook PCs and automotive display systems.
For engineers reviewing the MP3388DR-LF-P datasheet, MP3388DR-LF-P pinout, MP3388DR-LF-P application, or MP3388DR-LF-P equivalent, key selection criteria include 8-string current balance, programmable OVP threshold, PWM/DC dimming flexibility, low 600mV LED regulation voltage, and QFN24 thermal performance (θJA = 42°C/W).
Technical Context
The MP3388DR-LF-P integrates a fixed-frequency peak-current-mode boost controller with eight independent open-drain current sinks. Its internal 5V LDO powers gate drivers and logic, while the COMP pin enables loop compensation via external RC network. The device uses a 1.23V OVP reference and monitors LEDX pins for open/short fault detection with 1.6ms fault timer.
Dimming is implemented via dual-path control: PWMI accepts external PWM (100Hz–50kHz), while PWMO accepts DC analog (0.2–1.2V) or filters PWM into DPWM using an internal 400kΩ resistor and FSET-set oscillator (fDPWM = 3.5μF / CFSET). Current regulation relies on ISET-resistor programming (ILED = 1220V / (RSET + 1kΩ)).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 4.5V to 25V - supports wide-range DC supplies including 12V/19V laptop rails and automotive 12V nominal systems. |
| Max Output Voltage | 50V - sufficient to drive up to 10-series white LEDs (3.2V each) across 8 parallel strings. |
| LED Current Accuracy | ±3% matching between strings - ensures uniform brightness across large LCD backlights without per-string calibration. |
| Switching Frequency | Selectable 625kHz or 1.25MHz - allows trade-off between inductor size (22μH vs 10μH) and EMI profile. |
| LED Regulation Voltage | 600mV - minimizes conduction loss in current sinks, improving system efficiency at high LED currents. |
| OVP Threshold | Programmable via resistor divider to 1.23V reference - enables precise overvoltage protection aligned with LED string Vf tolerance. |
| Thermal Shutdown | 150°C - protects die during sustained overload or poor PCB heatsinking; recovers automatically after cooldown. |
Pinout & Package
MP3388DR-LF-P is housed in a thermally enhanced QFN24 (4mm × 4mm) package with exposed pad tied to GND. The 24-pin layout supports compact high-power LED driver designs with low θJA (42°C/W) and θJC (9°C/W) for effective heat dissipation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| EN (Pin 1) | Enable Control Input | Active-high logic input; must be pulled high (≥1.8V) to activate IC; floating state disables operation. |
| OSC (Pin 2) | Frequency Selection | Connect to GND for 625kHz; float or tie to VCC for 1.25MHz - sets boost switching frequency without external clock. |
| FSET (Pin 3) | DPWM Oscillator Timing | Capacitor-to-GND sets dimming frequency (fDPWM = 3.5μF / CFSET); enables precise brightness control timing. |
| PWMO (Pin 4) | PWM Filter Output / DC Dimming Input | Accepts filtered DC (0.2–1.2V) for negative-polarity dimming or drives external RC filter for PWM-to-DC conversion. |
| GND (Pin 5) | Analog Ground Reference | Reference for all analog circuitry; separate from PGND1/PGND2 to minimize noise coupling into feedback path. |
| PWMI (Pin 6) | PWM Signal Input | Accepts 100Hz–50kHz logic-level PWM (min 1.5V); internally converted to DPWM with same duty cycle. |
| LED8–LED1 (Pins 7–15) | LED String Cathode Outputs | Open-drain current sinks; each regulates one LED string; unused pins must connect to VOUT to prevent floating faults. |
| ISET (Pin 11) | Current Programming Node | Resistor-to-GND sets all 8 string currents identically (ILED = 1220V / (RSET + 1kΩ)); no trimming required. |
| OVP (Pin 16) | Over-Voltage Protection Sense | Resistor-divider input referenced to 1.23V; triggers shutdown if output exceeds programmed threshold (e.g., open-string condition). |
| PGND1/PGND2 (Pins 17–18) | Power Ground Returns | High-current return paths for boost switch; must be shorted externally and routed away from analog ground traces. |
| SW2/SW1 (Pins 19–20) | Boost Switch Drains | Parallel-connected internal MOSFET outputs; swing from GND to 50V; require low-inductance connection to inductor/diode. |
| VFAULT (Pin 21) | Fault Disconnection Driver | Drives external PMOS to isolate input during fault conditions (OVP, OTP, UVLO); active-high during normal operation. |
| COMP (Pin 22) | Error Amplifier Compensation | Connects external RC network to stabilize boost control loop; critical for transient response and ripple suppression. |
| VIN (Pin 23) | Main Power Input | 4.5–25V supply input; requires local ceramic bypass (≥4.7μF) close to pin to suppress switching noise. |
| VCC (Pin 24) | Internal 5V LDO Output | Supplies gate drivers and logic; self-generated when VIN > 5.5V; must be bypassed with ≥1μF ceramic capacitor. |
Key Features
| Feature | Design Value |
|---|---|
| 8-String Current Matching | ±3% regulation accuracy ensures consistent luminance across large-area LCD backlights without per-string calibration. |
| Low 600mV LED Sink Voltage | Reduces power loss in current sources by ~30% versus 1V-drop alternatives, directly improving thermal margin and efficiency. |
| Dual Dimming Architecture | Supports both external PWM (PWMI) and DC analog (PWMO) inputs - enables compatibility with MCU GPIOs or DAC-based brightness control. |
| Integrated Fault Protection | Detects open/short LED strings, overvoltage, UVLO, and thermal overload - prevents damage and enables fail-safe display operation. |
| QFN24 Thermal Performance | θJA = 42°C/W enables 2.9W continuous dissipation at +25°C ambient - suitable for space-constrained industrial and automotive backlight modules. |
Applications
| Notebook PC Backlight | Small LCD TV Backlight |
|---|---|
Use Scenario: Driving 8 parallel strings of 8–10 white LEDs behind 13–15.6-inch LCD panels with dynamic brightness control. IC Role / Device Role / Timing Role: Primary LED current regulator and boost controller; manages PWM dimming synchronization and string fault isolation. Use Value: Enables uniform edge-lit backlighting with <3% brightness variation across screen, supporting Windows HDR and adaptive sync requirements. | Use Scenario: Powering 8-string WLED arrays in 24–32-inch consumer LCD TVs with local dimming zones. IC Role / Device Role / Timing Role: Centralized current source with programmable OVP; coordinates with system MCU for scene-based dimming profiles. Use Value: Delivers stable 20mA per string at 45V output, reducing BOM count versus discrete driver solutions while maintaining CE/UL safety compliance. |
| Automotive Display Backlight | Handheld Terminal Display |
Use Scenario: Illuminating TFT LCDs in instrument clusters and infotainment units under 12V battery supply with wide temperature range. IC Role / Device Role / Timing Role: High-reliability LED driver with thermal shutdown and open-string detection; operates from -40°C to +85°C ambient. Use Value: Meets AEC-Q100 stress test requirements via robust internal protection and QFN24 thermal design, eliminating need for external thermal sensors. | Use Scenario: Backlighting compact monochrome or color LCDs in rugged handheld terminals used in logistics and field service. IC Role / Device Role / Timing Role: Low-noise, high-efficiency LED controller with DC dimming support for battery-powered operation. Use Value: Extends battery life via 2μA shutdown current and 600mV sink voltage, while enabling precise brightness control via 0.2–1.2V analog input. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar 8-channel WLED driver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| RT9397BZSP | Fixed 1MHz switching; no selectable frequency; 40V max output; ±5% current matching. | Limited to smaller panels (<24") due to lower voltage headroom and reduced matching precision. | Choose for cost-sensitive consumer displays where 50V headroom and 3% matching are not required. |
| ISL97693IRTZ | 9-channel architecture; 40V max output; supports I²C interface for digital current tuning. | Requires microcontroller integration; higher BOM cost; better suited for programmable multi-zone lighting. | Prefer when digital configurability and extra channel count justify added complexity and cost. |
Compared with RT9397BZSP and ISL97693IRTZ, MP3388DR-LF-P provides superior voltage headroom (50V), tighter current matching (±3%), and flexible frequency selection-making it optimal for high-brightness, large-panel backlighting where thermal efficiency and uniformity are critical.
Availability
MP3388DR-LF-P is available at Aetrix Electronics and suitable for notebook PC backlighting, automotive display systems, and industrial handheld terminal designs requiring stable component supply, RoHS-compliant packaging, and long-term production continuity.
Supply support for MP3388DR-LF-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 analog and power ICs, with core expertise in DC/DC conversion, LED drivers, and motor control.
The MP3388 product line targets large-format LCD backlighting applications, delivering integrated boost+current-source solutions that reduce external component count while maintaining high efficiency and reliability across automotive and industrial temperature ranges.
FAQ
What is the minimum recommended ISET resistor value for MP3388DR-LF-P?
The ISET pin requires a resistor to ground for current programming. Minimum RSET is 40.2kΩ, which sets maximum per-string current to 30mA. Using lower resistance risks exceeding absolute maximum ratings and thermal limits. Always verify power dissipation in RSET and ensure 1% tolerance for tight current matching.
Can MP3388DR-LF-P operate with VIN below 5.5V?
Yes - when VIN is below 5.5V, the internal VCC LDO cannot regulate. In this case, VCC must be externally supplied with a stable 5V rail, and VIN can be as low as 4.5V. This configuration maintains full functionality including PWM dimming and protection features, but requires additional board space and power routing.
How does open-string protection work on MP3388DR-LF-P?
When an LED string opens, its LEDX pin voltage drops below 175mV. The IC detects this condition, marks off the faulty string, and continues regulating remaining strings using the highest-voltage string as reference. If all strings open, the boost converter shuts down. Mark-off status persists until power cycle or EN toggle.
What is the purpose of the VFAULT pin and how should it be connected?
VFAULT is an active-high driver for an external PMOS transistor placed between VIN and the boost input. During normal operation, VFAULT turns on the PMOS to enable power flow. During faults (OVP, OTP, UVLO), it pulls low to disconnect input, preventing damage and enabling safe restart. A 10kΩ pull-down is recommended when unused.
Is MP3388DR-LF-P compatible with ceramic output capacitors?
Yes - the MP3388DR-LF-P is optimized for ceramic output capacitors with X7R dielectric. A 2.2μF unit is recommended for stability and low ESR. Avoid electrolytic or tantalum types due to higher ESR, which degrades loop response and increases output ripple beyond specification limits.
Does MP3388DR-LF-P support analog dimming without external components?
No - true analog dimming requires applying 0.2–1.2V DC directly to PWMO, but this mode still requires the FSET capacitor to generate the internal DPWM carrier frequency. No additional resistors or op-amps are needed, but CFSET must be installed to define dimming frequency per fDPWM = 3.5μF / CFSET.
What is the maximum allowable duty cycle for the boost converter?
The MP3388DR-LF-P supports up to 96% maximum duty cycle, enabling operation with high step-up ratios (e.g., 5V input → 50V output). This allows use with lower input voltages while maintaining regulation, but requires careful inductor saturation current rating and thermal design to avoid excessive conduction losses.
MP3388DR-LF-P Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Monolithic Power Systems Inc.
- Series:
- -
- Package/Case:
- 24-VFQFN Exposed Pad
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Not For New Designs
- Type:
- DC DC Regulator
- Topology:
- Step-Up (Boost)
- Internal Switch(s):
- Yes
- Number of Outputs:
- 8
- Voltage - Supply (Min):
- 4.5V
- Voltage - Supply (Max):
- 25V
- Voltage - Output:
- 50V
- Current - Output / Channel:
- 20mA
- Frequency:
- 1.25MHz
- Dimming:
- PWM
- Applications:
- Backlight
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 24-QFN (4x4)
MP3388DR-LF-P FAQ
1.How can I place an order for MP3388DR-LF-P through Aetrix?
Please submit a Request for Quotation (RFQ) for MP3388DR-LF-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 MP3388DR-LF-P reliable?
The price and inventory of MP3388DR-LF-P are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MP3388DR-LF-P is usually 5 days.
3.What payment methods are accepted for MP3388DR-LF-P?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MP3388DR-LF-P transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MP3388DR-LF-P?
MP3388DR-LF-P orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MP3388DR-LF-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 MP3388DR-LF-P?
For technical support, including MP3388DR-LF-P datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MP3388DR-LF-P requirements.
6.How does Aetrix verify that MP3388DR-LF-P is sourced from the original manufacturer or authorized distributors?
All MP3388DR-LF-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 MP3388DR-LF-P meets industry standards.
7.What is the process for return or replacement of MP3388DR-LF-P?
All MP3388DR-LF-P units undergo pre-shipment inspection (PSI). If there is an issue with MP3388DR-LF-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 MP3388DR-LF-P part is unused and in its original packaging.
Return procedure for MP3388DR-LF-P:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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