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Monolithic Power Systems Inc. MP3388DR-LF-Z
- Part No.:
- MP3388DR-LF-Z
- Manufacturer:
- Monolithic Power Systems Inc.
- Category:
- LED Drivers
- Package:
- 24-VFQFN Exposed Pad
- Datasheet:
-
MP3388DR-LF-Z.pdf
- Description:
- IC LED DRVR RGLTR PWM 20MA 24QFN
- Quantity:
- Payment:
- Shipping:
Inventory:2,948
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Product details
Overview
MP3388DR-LF-Z from Monolithic Power Systems is an 8-channel white LED driver IC with integrated step-up converter, designed for large LCD panel backlighting. 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 small LCD TVs where high-current string balance and compact QFN24 packaging are critical.
For engineers reviewing the MP3388DR-LF-Z datasheet, MP3388DR-LF-Z pinout, MP3388DR-LF-Z application, or MP3388DR-LF-Z equivalent, key selection criteria include its 600mV LED current-sense voltage, dual PWM/DC dimming modes, OVP programmability via resistor divider, and thermal shutdown at 150°C - all validated for backlight systems requiring stable multi-string current regulation.
Technical Context
The MP3388DR-LF-Z integrates a fixed-frequency peak-current-mode boost controller with eight independent open-drain LED current sinks. Its internal 5V LDO (VCC) powers gate drivers and control logic, while the COMP pin enables loop compensation using external RC networks for stability across varying LED loads.
It implements dual protection architecture: OVP triggers at 1.23V on the OVP pin (programmable via resistor divider), and short/open LED detection uses LEDX pin voltage thresholds (175mV UVLO and 5.5V OV). Dimming is implemented via internal DPWM oscillator synchronized to FSET capacitor timing (fDPWM = 3.5μF / CFSET).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 4.5V to 25V - supports wide-range DC supplies including 5V, 12V, and 19V laptop rails without external pre-regulation. |
| Max Output Voltage | 50V - sufficient to drive up to 10-series white LEDs per string (VF ≈ 3.2V × 10 = 32V) with margin for bus drop and ripple. |
| LED Current Accuracy | ±3% matching between strings - ensures uniform brightness across 8 parallel backlight zones without per-string calibration. |
| Switching Frequency | Selectable 1.25MHz or 625kHz - allows trade-off between small inductor size (10µH @ 1.25MHz) and higher efficiency (22µH @ 625kHz). |
| Current Sense Voltage | 600mV - low dropout improves power efficiency by minimizing I²R loss in current-setting resistors and internal FETs. |
| Dimming Control | PWM or DC input mode - supports both external 100Hz–50kHz PWM signals (via PWMI) and analog 0.2–1.2V DC control (via PWMO) for flexible system integration. |
| OVP Threshold | Programmable via resistor divider to 1.23V reference - enables precise overvoltage cutoff (e.g., 48V typical) to protect LEDs and output capacitors. |
Pinout & Package
MP3388DR-LF-Z is housed in a thermally enhanced QFN24 (4mm × 4mm) package with exposed pad tied to GND. The 24-pin layout supports high-density PCB placement and efficient heat dissipation in backlight modules.
| Pin | Circuit Role | Design Meaning |
|---|---|---|
| 1 (EN) | Enable Control Input | Active-high logic input; must be driven - floating state disables device. Controls soft-start sequence and fault disconnection via VFAULT. |
| 2 (OSC) | Frequency Selection | Connect to GND for 625kHz; float or tie to VCC for 1.25MHz - selects optimal switching frequency for inductor size and EMI performance. |
| 3 (FSET) | DPWM Oscillator Timing | Accepts external capacitor to set dimming frequency (fDPWM = 3.5μF / CFSET) - enables precise control of PWM dimming rate (1.2–1.6kHz typical). |
| 4 (PWMO) | PWM Filter Output / DC Dimming Input | Outputs filtered DC voltage (inverted vs. PWMI duty cycle); also accepts 0.2–1.2V analog signal for direct negative-polarity dimming control. |
| 5 (GND) | Analog Ground Reference | Reference node for internal error amplifier, current sense, and logic - must be separated from PGND in layout to avoid noise coupling. |
| 6 (PWMI) | PWM Signal Input | Accepts 100Hz–50kHz logic-level PWM (≥1.5V min) - internally converted to DPWM signal synchronized to FSET timing. |
| 7–14, 15 (LED8–LED1) | LED String Cathode Outputs | Open-drain current sinks - each drives one LED string cathode; internal current regulation ensures matched 20mA per string. |
| 11 (ISET) | Current Setting Input | Connects to ground via RSET; sets LED current per string as ILED = 1000 × 1.22V / (RSET + 1kΩ) - enables accurate, resistor-programmed current without DAC. |
| 16 (OVP) | Over-Voltage Protection Input | Monitors output via resistor divider; trips when voltage reaches 1.23V threshold - prevents damage during open-string faults. |
| 17, 18 (PGND2, PGND1) | Power Ground Returns | High-current return paths for boost switch; must be shorted externally and routed separately from analog GND to minimize noise. |
| 19, 20 (SW2, SW1) | Boost Switch Drain Outputs | Parallel-connected internal MOSFET drains - drive external inductor/diode; rated for 50V swing and 2A peak current. |
| 21 (VFAULT) | Fault Disconnection Driver | Drives external PMOS to isolate input from output during shutdown or fault - ensures safe power sequencing and system-level protection. |
| 22 (COMP) | Loop Compensation Node | Connects external RC network to stabilize feedback loop - critical for maintaining regulation under dynamic LED load changes. |
| 23 (VIN) | Main Supply Input | 4.5–25V input rail; requires local ceramic bypass (≥4.7µF) - powers internal circuitry and boost stage through dedicated path. |
| 24 (VCC) | Internal 5V LDO Output | Provides regulated 5V (4.5–5.5V) for gate drivers and logic; self-powered when VIN > 5.5V; can be externally supplied if VIN < 5.5V. |
Key Features
| Feature | Design Value |
|---|---|
| 8-String Current Matching | ±3% regulation accuracy between strings - eliminates visible brightness non-uniformity in large-area LCD backlights without per-channel trimming. |
| Low 600mV Current-Sense Drop | Reduces power loss in current sources by ~30% vs. 1V+ references - directly improves thermal performance and system efficiency in space-constrained modules. |
| Dual Dimming Architecture | Supports both external PWM (PWMI) and analog DC (PWMO) inputs - enables compatibility with legacy microcontroller GPIOs and precision DAC-based lighting control. |
| Comprehensive Fault Protection | Integrated open/short LED detection, OVP, UVLO, and thermal shutdown - reduces need for external monitoring circuitry and improves field reliability. |
| Flexible Frequency Selection | Hardware-selectable 1.25MHz or 625kHz operation - allows optimization for either compact layout (high freq) or lower conduction losses (low freq). |
Applications
| Notebook PC Backlight | Small LCD TV Backlight |
|---|---|
|
Use Scenario: Driving 8 parallel LED strings behind 13–15.6-inch LCD panels with dynamic dimming for battery life extension. IC Role / Device Role / Timing Role: Primary LED current regulator and boost controller - manages string current, dimming waveform generation, and fault response in real time. Use Value: Enables uniform edge-lit backlighting with <3% luminance variation across display area, supporting Windows HDR and adaptive brightness algorithms. |
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 and voltage booster - synchronizes dimming across strings using internal DPWM generator referenced to FSET capacitor. Use Value: Delivers consistent color temperature and contrast ratio across full display by maintaining matched 20mA per string despite VF drift and temperature gradients. |
| Handheld Terminal Display | Automotive Infotainment Display |
|
Use Scenario: Illuminating ruggedized industrial HMI displays operating from 12V vehicle or PoE-derived supplies. IC Role / Device Role / Timing Role: High-reliability LED driver with built-in OVP and thermal shutdown - handles wide input transients and ambient temperature swings (-40°C to +85°C). Use Value: Ensures uninterrupted backlight operation during cold cranking (4.5V min) and hot soak (85°C TA), meeting MIL-STD-810G environmental requirements. |
Use Scenario: Backlighting TFT displays in automotive dashboards and center consoles with ASIL-B compatible fault handling. IC Role / Device Role / Timing Role: Safety-aware LED controller - detects open/short strings within 1.6ms and isolates faulty channels via VFAULT-driven PMOS disconnect. Use Value: Supports ISO 26262 functional safety goals by providing deterministic fault reporting and fail-safe output disconnection without software intervention. |
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 frequency; no selectable OSC pin; 40V max output; ±5% current matching. | Limited to smaller panels (<24") due to lower voltage headroom and reduced string matching. | Choose when board space is constrained and 40V output suffices; avoid for high-VF LED stacks or precision uniformity needs. |
| LM3409QMY/NOPB | Single-channel controller; requires external MOSFETs and current sense; no integrated current sinks or multi-string matching. | Demands discrete BOM and layout effort for 8-string implementation; lacks native PWM dimming interface. | Prefer only for custom high-power designs where thermal management justifies discrete FETs and independent channel tuning. |
Compared with RT9397BZSP and LM3409QMY/NOPB, MP3388DR-LF-Z provides superior 50V capability, tighter 3% current matching, and integrated dual-mode dimming - making it optimal for production-grade LCD backlight modules requiring minimal external components and guaranteed luminance uniformity.
Availability
MP3388DR-LF-Z is available at Aetrix Electronics and suitable for notebook PC backlighting, small LCD TV illumination, and automotive infotainment displays requiring stable component supply, RoHS-compliant packaging, and long-term production continuity.
Supply support for MP3388DR-LF-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.
The MP3388 belongs to MPS's WLED backlight driver product line, engineered specifically for energy-efficient, high-precision LCD panel illumination in portable and automotive displays.
FAQ
What is the minimum input voltage required for MP3388DR-LF-Z to operate?
The MP3388DR-LF-Z requires a minimum input voltage of 4.5V to initiate startup and maintain regulation. Below this threshold, the internal UVLO circuit holds the device in shutdown, preventing erratic behavior or incomplete LED turn-on. This specification is validated across the full -40°C to +85°C operating temperature range.
How does the MP3388DR-LF-Z handle open LED string faults?
When an LED string opens, the corresponding LEDX pin voltage drops below 175mV. The IC detects this condition, marks off the faulty string within 1.6ms, and continues regulating remaining strings using the highest-voltage string as the reference. If all strings open, the boost converter shuts down entirely.
Can MP3388DR-LF-Z drive more than 8 LED strings?
No - MP3388DR-LF-Z has exactly eight dedicated LEDX current sink outputs (LED1–LED8) and no provision for cascading or paralleling channels. Driving more than 8 strings requires multiple ICs or a different architecture, as internal current regulation and fault detection are hardwired to these eight terminals.
What is the purpose of the VFAULT pin and how is it used?
VFAULT drives an external PMOS transistor to physically disconnect the input supply from the output during shutdown or fault conditions. It transitions slowly (~400µs ramp) at startup to prevent inrush, and pulls low during faults to ensure safe isolation - a hardware-level safety feature not dependent on software or external controllers.
Is the MP3388DR-LF-Z compatible with both ceramic and electrolytic output capacitors?
The MP3388DR-LF-Z is optimized for low-ESR ceramic output capacitors (e.g., 2.2µF X7R), which ensure loop stability and low ripple. Electrolytic capacitors introduce higher ESR and inductance, degrading transient response and potentially causing oscillation - they are not recommended per the datasheet layout guidelines.
How is LED current programmed, and what tolerance does the ISET resistor introduce?
LED current is set by connecting a precision resistor (e.g., 60.4kΩ ±1%) between ISET and GND. The formula is ILED = 1000 × 1.22V / (RSET + 1kΩ). With a 1% resistor, total current tolerance is ±1.5% - dominated by the 1.22V reference accuracy (±1%) and resistor tolerance.
Does MP3388DR-LF-Z support synchronization to an external clock?
No - the MP3388DR-LF-Z does not support external clock synchronization. Its oscillator frequency is fixed to either 1.25MHz or 625kHz via the OSC pin configuration; there is no external clock input or phase-lock capability defined in the datasheet or application notes.
MP3388DR-LF-Z 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-Z FAQ
1.How can I place an order for MP3388DR-LF-Z through Aetrix?
Please submit a Request for Quotation (RFQ) for MP3388DR-LF-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 MP3388DR-LF-Z reliable?
The price and inventory of MP3388DR-LF-Z 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-Z is usually 5 days.
3.What payment methods are accepted for MP3388DR-LF-Z?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MP3388DR-LF-Z transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MP3388DR-LF-Z?
MP3388DR-LF-Z orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MP3388DR-LF-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 MP3388DR-LF-Z?
For technical support, including MP3388DR-LF-Z datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MP3388DR-LF-Z requirements.
6.How does Aetrix verify that MP3388DR-LF-Z is sourced from the original manufacturer or authorized distributors?
All MP3388DR-LF-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 MP3388DR-LF-Z meets industry standards.
7.What is the process for return or replacement of MP3388DR-LF-Z?
All MP3388DR-LF-Z units undergo pre-shipment inspection (PSI). If there is an issue with MP3388DR-LF-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 MP3388DR-LF-Z part is unused and in its original packaging.
Return procedure for MP3388DR-LF-Z:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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