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Monolithic Power Systems Inc. MP3388EY-LF-Z
- Part No.:
- MP3388EY-LF-Z
- Manufacturer:
- Monolithic Power Systems Inc.
- Category:
- LED Drivers
- Package:
- 28-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
MP3388EY-LF-Z.pdf
- Description:
- IC LED DRV RGLTR PWM 20MA 28SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:3,353
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Product details
Overview
MP3388EY-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 per-string current with ±3% matching accuracy, and supports selectable 1.25MHz/625kHz switching frequency. Used in notebook PCs and small LCD TVs where precise multi-string brightness control and high efficiency are required.
For engineers reviewing the MP3388EY-LF-Z datasheet, MP3388EY-LF-Z pinout, MP3388EY-LF-Z application, or MP3388EY-LF-Z equivalent, key selection criteria include its 8-channel independent current regulation, 600mV LED current source dropout, dual PWM/DC dimming modes, OVP/UVLO/thermal protection, and SOIC28 package compatibility with industrial backlight designs.
Technical Context
The MP3388EY-LF-Z integrates a fixed-frequency peak-current-mode boost controller with eight matched open-drain current sinks. Its internal 5V LDO (VCC) powers gate drivers and logic, while the COMP pin enables loop compensation via external RC networks for stable voltage regulation across varying LED string counts and forward voltages.
Dimming is implemented through four validated methods: external PWM on PWMI, DC analog input on PWMO, or internally generated DPWM using FSET-set frequency (1.2–1.6kHz typical). Protection includes programmable OVP (1.23V threshold), LED open/short detection (175mV UVLO / 5.5V OV thresholds), and thermal shutdown at 150°C.
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 pre-regulation. |
| Max Output Voltage | 50V - sufficient to drive up to 10-series white LEDs per string (VF ≈ 3.2V) under worst-case temperature and aging conditions. |
| LED Current Matching | ±3% - ensures uniform luminance across all 8 strings without external calibration, critical for artifact-free display backlighting. |
| Switching Frequency | Selectable 625kHz or 1.25MHz - enables optimization of inductor size (22µH vs 10µH) and EMI profile per layout constraints. |
| Current Sense Dropout | 600mV - minimizes power loss in current sources, improving system efficiency especially at high LED currents (e.g., 20mA/string). |
| Dimming Control Modes | PWM (PWMI), DC analog (PWMO), or internally generated DPWM - provides flexible interface options for MCU-, FPGA-, or analog-based brightness control. |
| OVP Threshold Accuracy | ±5% (1.17–1.3V) - allows precise setting of overvoltage trip point via resistor divider on OVP pin to protect downstream components. |
Pinout & Package
MP3388EY-LF-Z uses a 28-pin SOIC package with exposed pad not connected (NC). Pin functions are electrically identical to the QFN24 variant but mapped to SOIC28 pinout per datasheet Table "PIN FUNCTIONS (continued)".
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (VFAULT) | Fault disconnection driver output | Drives external PMOS to isolate input during fault conditions (OVP, OTP, open/short LED); requires pull-up resistor. |
| 2 (COMP) | Boost loop compensation node | Connects external RC network to stabilize feedback loop; directly affects transient response and stability margin. |
| 3 (VIN) | Main power input | Accepts 4.5–25V supply; must be locally bypassed with ≥4.7µF ceramic capacitor near pin. |
| 4 (VCC) | Internal 5V LDO output | Supplies gate drivers and logic; if VIN < 5.5V, tie VCC to external 5V rail to maintain functionality. |
| 5 (EN) | Enable control input | Active-high logic; must not float; internal UVLO (1.8V ON, 0.6V OFF) prevents erratic startup. |
| 6 (OSC) | Switching frequency select | Ground = 625kHz; floating or tied to VCC = 1.25MHz - sets fundamental switching node for component sizing. |
| 7 (FSET) | DPWM frequency programming | Connects capacitor to GND; fDPWM = 3.5µF / CFSET - defines dimming update rate (e.g., 2.2nF → 1.6kHz). |
| 8 (PWMO) | PWM filter output / DC dimming input | Filters PWMI signal into DC level or accepts 0.2–1.2V analog input; polarity is negative (higher voltage = lower brightness). |
| 9 (GND) | Analog ground reference | Reference for all analog circuitry; must be separated from PGND1/PGND2 to avoid noise coupling into regulation loop. |
| 10 (PWMI) | External PWM signal input | Accepts 100Hz–50kHz square wave; internal 400kΩ pull-down enables filtering when used with PWMO capacitor. |
| 11–14, 16, 18–21 (LED1–LED8) | LED string cathode current sinks | Open-drain outputs regulating current per string; each sinks up to 30mA; unused pins must connect to VOUT. |
| 15 (ISET) | LED current programming | Ties to GND via RSET; ILED = 1220V / (RSET + 1kΩ) - sets identical current across all 8 strings. |
| 17 (OVP) | Over-voltage protection sense | Resistor divider from VOUT sets trip point; triggers shutdown when voltage reaches 1.23V at this pin. |
| 18, 22 (PGND1, PGND2) | Power ground return paths | Separate low-impedance returns for boost switch; must be shorted externally and routed away from analog GND. |
| 19, 20 (SW1, SW2) | Boost switch drain outputs | Parallel-connected internal MOSFET drains; swing from GND to 50V; require shorted traces and low-inductance layout. |
| 23–27 (NC) | No-connect terminals | Not bonded; must remain unconnected to avoid parasitic coupling or latch-up risk. |
Key Features
| Feature | Design Value |
|---|---|
| 8-channel independent current regulation | Each LED string driven by dedicated current sink with ±3% matching - eliminates inter-string brightness variation without external DACs or op-amps. |
| Programmable DPWM dimming frequency | FSET pin sets dimming update rate (1.2–1.6kHz typical) - decouples brightness control timing from MCU clock and avoids audible noise. |
| Low 600mV current source dropout | Reduces conduction loss in current sinks - improves full-load efficiency by ~2–3% versus 1V-drop alternatives at 20mA/string. |
| Dual dimming interface support | Simultaneous PWMI (PWM) and PWMO (DC/analog) inputs - enables seamless migration between microcontroller-based and analog potentiometer-based brightness control. |
| Comprehensive fault protection | Integrated OVP, UVLO, open/short LED detection, and thermal shutdown - reduces need for external monitoring ICs in safety-critical displays. |
Applications
| Notebook PC Backlight | Small LCD TV Backlight |
|---|---|
|
Use Scenario: Driving 8 parallel LED strings behind 13–15.6-inch LCD panels with dynamic local dimming zones. IC Role / Device Role / Timing Role: Primary LED current regulator and boost controller; manages string current, dimming synchronization, and fault isolation. Use Value: Enables uniform edge-lit backlighting with <3% luminance variance across screen, supporting sRGB color gamut compliance. |
Use Scenario: Powering 8-string WLED arrays in 24–32-inch consumer LCD TVs with HDMI/USB-C powered operation. IC Role / Device Role / Timing Role: Central backlight driver with integrated OVP and thermal management; interfaces to main SoC via PWM or analog dimming. Use Value: Eliminates discrete boost + current sink solutions, reducing BOM count by 12+ components while maintaining 90%+ system efficiency. |
| Handheld Terminal Display | Automotive Infotainment Display |
|
Use Scenario: Illuminating ruggedized 7–10 inch industrial HMI screens operating from 12V vehicle or PoE-derived supply. IC Role / Device Role / Timing Role: High-reliability LED driver with UVLO hysteresis (200mV) and -20°C to +85°C operation range. Use Value: Ensures consistent brightness during cold cranking (VIN dip to 4.5V) and hot ambient conditions without firmware intervention. |
Use Scenario: Backlighting 12.3-inch digital instrument clusters requiring AEC-Q200-aligned performance and fault logging. IC Role / Device Role / Timing Role: Safety-aware LED controller with open/short LED detection and VFAULT-controlled input isolation. Use Value: Supports ASIL-B functional safety requirements by enabling fail-safe shutdown and diagnostic flag reporting via VFAULT state. |
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 |
|---|---|---|---|
| MP3389EY-LF-Z | Same architecture, higher max output voltage (60V), improved current matching (±2%), and extended temp range (-40°C to +85°C). | Required for >12-series LED strings or automotive-grade thermal margins; pin-compatible but requires updated RSET calculation. | Choose for next-gen designs needing higher headroom or broader temperature compliance; not drop-in due to revised OVP scaling. |
| LM3409QMY/NOPB | Single-channel buck-boost LED driver; no integrated multi-string current regulation; requires external current mirrors or DACs for 8-string operation. | Suitable only when custom analog front-end is acceptable; lacks native PWM dimming and open/short protection logic. | Select only for highly customized systems where flexibility outweighs integration benefits; adds 8× external FETs and sensing resistors. |
Compared with MP3388EY-LF-Z, MP3389EY-LF-Z offers tighter current matching and higher voltage headroom at same footprint, while LM3409QMY/NOPB demands significant external circuitry to emulate basic 8-string functionality - making MP3388EY-LF-Z optimal for cost-sensitive, space-constrained backlight designs.
Availability
MP3388EY-LF-Z is available at Aetrix Electronics and suitable for notebook PC backlighting, small LCD TV power systems, and handheld terminal display designs requiring stable component supply, RoHS-compliant packaging, and long-term industrial availability.
Supply support for MP3388EY-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, and global manufacturing partnerships.
The MP3388 belongs to MPS's WLED backlight driver product line, engineered specifically for energy-efficient, high-precision LCD panel illumination in space-constrained consumer and industrial displays.
FAQ
What is the maximum LED string count supported by MP3388EY-LF-Z?
The MP3388EY-LF-Z supports exactly 8 independent LED strings via dedicated LED1–LED8 current sink pins. Each string must be connected to its assigned pin; unused strings require connection of the corresponding LEDx pin to VOUT to prevent fault triggering. No configuration enables more than 8 strings.
Can MP3388EY-LF-Z operate with input voltage below 4.5V?
No - the absolute minimum operating input voltage is 4.5V per datasheet Recommended Operating Conditions. Below this, the internal UVLO prevents startup, and the VCC LDO cannot regulate. If 3.3V or 5V-only rails are used, an external 5V supply must be applied to VCC, and VIN must still meet 4.5V minimum.
How is LED current programmed, and what tolerance does RSET require?
LED current is set by a single resistor (RSET) from ISET pin to GND, using ILED = 1220V / (RSET + 1kΩ). For 20mA target, RSET = 60.4kΩ (1% tolerance recommended). Total current accuracy depends on RSET tolerance, internal 1.22V reference (±1%), and matching - ±3% string-to-string is guaranteed regardless of RSET drift.
Does MP3388EY-LF-Z support analog (DC) dimming without external components?
Yes - applying 0.2V–1.2V DC directly to PWMO pin enables analog dimming with no external filter components. Voltages below 0.2V force 100% duty cycle (full brightness); above 1.2V forces 0% (off). The internal polarity is negative, so increasing voltage decreases brightness linearly.
What thermal derating applies to MP3388EY-LF-Z in SOIC28 package?
In SOIC28, θJA = 60°C/W. At TA = +85°C, maximum continuous power dissipation is PDMAX = (125°C − 85°C) / 60°C/W = 0.67W. Exceeding this causes thermal shutdown. Layout with copper pour under exposed pad (though NC in SOIC) and 2oz PCB copper improves real-world performance beyond datasheet limits.
Is MP3388EY-LF-Z pin-compatible with MP3388DR-Z (QFN24)?
No - MP3388EY-LF-Z (SOIC28) and MP3388DR-Z (QFN24) have different pin counts and mappings. While functionally identical, SOIC28 includes NC pins and reorders signals (e.g., VFAULT at pin 1 vs pin 21 in QFN). PCB redesign and schematic updates are required for substitution.
How does open-string protection behave when multiple strings fail?
MP3388EY-LF-Z detects open strings via LEDx pin voltage <175mV. It marks off failed strings and continues regulating remaining strings using the highest-VF string as reference. If all 8 strings open, the boost converter shuts down and VFAULT disables the input PMOS within 400µs.
MP3388EY-LF-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:
- 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:
- -20°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 28-SOIC
MP3388EY-LF-Z FAQ
1.How can I place an order for MP3388EY-LF-Z through Aetrix?
Please submit a Request for Quotation (RFQ) for MP3388EY-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 MP3388EY-LF-Z reliable?
The price and inventory of MP3388EY-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 MP3388EY-LF-Z is usually 5 days.
3.What payment methods are accepted for MP3388EY-LF-Z?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MP3388EY-LF-Z transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MP3388EY-LF-Z?
MP3388EY-LF-Z orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MP3388EY-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 MP3388EY-LF-Z?
For technical support, including MP3388EY-LF-Z datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MP3388EY-LF-Z requirements.
6.How does Aetrix verify that MP3388EY-LF-Z is sourced from the original manufacturer or authorized distributors?
All MP3388EY-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 MP3388EY-LF-Z meets industry standards.
7.What is the process for return or replacement of MP3388EY-LF-Z?
All MP3388EY-LF-Z units undergo pre-shipment inspection (PSI). If there is an issue with MP3388EY-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 MP3388EY-LF-Z part is unused and in its original packaging.
Return procedure for MP3388EY-LF-Z:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
MP3388EY-LF-Z Tags
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