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Monolithic Power Systems Inc. MP3388SGR-P
- Part No.:
- MP3388SGR-P
- Manufacturer:
- Monolithic Power Systems Inc.
- Category:
- LED Drivers
- Package:
- 24-VFQFN Exposed Pad
- Datasheet:
-
MP3388SGR-P.pdf
- Description:
- IC LED DRVR RGLTR PWM 20MA 24QFN
- Quantity:
- Payment:
- Shipping:
Inventory:2,645
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Product details
Overview
MP3388SGR-P from Monolithic Power Systems is an 8-channel, current-mode step-up white LED driver IC designed for LCD panel backlighting. It delivers up to 55V output from a 4.3V–25V input, regulates each string to ±2.5% matching accuracy with external RSET, and supports selectable 625kHz/1.25MHz switching frequency. Used in notebook PCs and tablet displays where precise multi-string current control and compact QFN24 packaging are critical.
For engineers reviewing the MP3388SGR-P datasheet, MP3388SGR-P pinout, MP3388SGR-P application, or MP3388SGR-P equivalent, this page provides verified technical context on PWM dimming modes (external PWM, DC-input PWM, internal DPWM), OVP/short-open LED protection behavior, thermal shutdown at 150°C, and ILED programming via ISET pin with 1.22V reference.
Technical Context
The MP3388SGR-P integrates a fixed-frequency peak-current-mode boost converter with eight independent open-drain LED current sinks. Its regulation loop uses a 600mV reference at each LEDx pin and selects the highest active string voltage to set VOUT, enabling dynamic bus voltage optimization across varying string counts.
Dimming is implemented through dual-path control: PWMI accepts external PWM signals (100Hz–50kHz), while PWMO accepts DC analog inputs (0.2V–1.2V) or direct PWM; both modulate LED current via an internal triangle waveform generator whose frequency is set by CFPWM on the FPWM pin (fDPWM = 3.5μF/CFPWM).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 4.3V to 25V - supports wide-range DC supplies including 5V, 12V, and 19V adapter rails without pre-regulation. |
| Max Output Voltage | 55V - sufficient to drive up to 15 white LEDs in series per string at typical VF ≈ 3.3V. |
| LED String Count | 8 independent channels - enables high-resolution local dimming in 10-inch+ LCD backlights with segmented zones. |
| Current Matching Accuracy | ±2.5% - ensures uniform luminance across all strings without per-channel calibration. |
| Switching Frequency | Selectable 625kHz or 1.25MHz - allows trade-off between inductor size (22µH @ 625kHz vs. 10µH @ 1.25MHz) and EMI profile. |
| ILED Programming | 1.22V reference at ISET pin - sets string current via RSET using ILED = 1220V/RSET; e.g., 60.4kΩ yields 20mA. |
| Thermal Shutdown | 150°C - protects against sustained overload or poor PCB thermal design; recovers automatically after cooldown. |
| OVP Threshold | Programmable via resistor divider on OVP pin (1.23V trip) - prevents overvoltage damage during open-string faults. |
Pinout & Package
MP3388SGR-P is housed in a thermally enhanced QFN24 (4mm × 4mm) package with exposed pad tied to GND. The 24-pin layout separates power grounds (PGND1/PGND2), analog ground (GND), and high-voltage switching nodes (SW1/SW2) to minimize noise coupling and support efficient thermal dissipation (θJA = 42°C/W).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| EN (Pin 1) | Enable control input | Active-high logic; must be pulled to VCC or driven - floating state disables device and reduces quiescent current to 2μA. |
| OSC (Pin 2) | Frequency selection | Ground = 625kHz; float or VCC = 1.25MHz - determines inductor size, efficiency peak, and EMI frequency band. |
| FPWM (Pin 3) | DPWM frequency setting | Connects to GND via capacitor CFPWM; sets internal dimming oscillator frequency (e.g., 2.2nF → 1.6kHz). |
| PWMO (Pin 4) | PWM filter output / DC dimming input | Accepts 0.2–1.2V DC for negative-polarity dimming or filters external PWM into analog control voltage. |
| GND (Pin 5) | Analog ground reference | Reference for all analog circuitry (COMP, ISET, OVP); must be low-impedance and separated from PGND near IC. |
| PWMI (Pin 6) | External PWM signal input | Accepts 1.5–5V square wave (100Hz–50kHz); enables synchronized backlight dimming with system timing controller. |
| LED1–LED8 (Pins 7–10, 12–15) | LED string cathode drivers | Open-drain NMOS outputs; sink regulated current to ground - each independently protected against open/short faults. |
| ISET (Pin 11) | Current reference node | 1.22V precision reference; connects to GND via RSET to program identical current across all 8 strings. |
| OVP (Pin 16) | Over-voltage protection sense | Monitors output via resistor divider; trips at 1.23V to disable boost and prevent damage during open-string conditions. |
| PGND1/PGND2 (Pins 17–18) | Power ground return paths | Must be shorted externally and connected to power inductor ground - handles high di/dt boost return current. |
| SW1/SW2 (Pins 19–20) | Boost switch drain outputs | Internal N-MOSFET drains; swing from GND to 55V - must be shorted and routed with minimal loop area for EMI control. |
| VFAULT (Pin 21) | Fault-disconnection driver | Drives external PMOS to disconnect VIN from system during fault - active-high during normal startup, low during shutdown. |
| COMP (Pin 22) | Loop compensation node | Connects RC network to GND to stabilize feedback loop; placement affects transient response and stability margin. |
| VIN (Pin 23) | Main supply input | 4.3–25V input; powers internal circuitry and boost stage - requires local 4.7µF ceramic bypass capacitor. |
| VCC (Pin 24) | Internal 5V LDO output | Supplies gate driver and logic; self-generated when VIN > 5.5V; otherwise must be tied to external 5V rail. |
Key Features
| Feature | Design Value |
|---|---|
| 8-channel current matching | ±2.5% accuracy between strings - eliminates visible brightness gradients in multi-zone LCD backlights without trimming. |
| Low 600mV LED regulation voltage | Reduces conduction loss in current sinks - improves overall efficiency by ~3% versus 1V-drop competitors at 20mA/string. |
| Dual PWM dimming architecture | Supports both external PWM (PWMI) and DC-input PWM (PWMO) with programmable frequency - enables flexible integration with MCU or TCON. |
| Comprehensive fault protection | Integrated open-string detection (via OVP), short-string monitoring (LEDx >5.5V), UVLO (3.9V), and thermal shutdown (150°C) - eliminates need for external supervisors. |
| Configurable switching frequency | 625kHz or 1.25MHz selection via OSC pin - allows optimization of BOM cost (larger inductor at lower f) vs. board space (smaller inductor at higher f). |
| QFN24 (4mm × 4mm) package | Thermally enhanced layout with exposed pad - achieves 2.9W power dissipation at +25°C ambient, supporting high-brightness designs. |
Applications
| Notebook PC Backlighting | Tablet Computer Display |
|---|---|
|
Use Scenario: Driving 8 parallel LED strings behind a 13.3-inch IPS LCD panel with local dimming zones. IC Role / Device Role / Timing Role: Step-up converter + 8-channel current regulator; provides stable 20mA per string with <2.5% mismatch under variable input (12V adapter or battery discharge). Use Value: Enables uniform edge-lit backlighting with no visible banding, even during rapid brightness transitions controlled via embedded controller PWM. |
Use Scenario: Powering dual 4-string LED arrays in a 10.1-inch Android tablet with adaptive brightness and battery-life optimization. IC Role / Device Role / Timing Role: High-efficiency boost driver with DC-input PWM dimming; accepts analog voltage from ambient light sensor to adjust luminance without MCU intervention. Use Value: Reduces system power consumption by 18% versus fixed-current solutions due to 600mV dropout and pulse-skipping light-load mode. |
| Small LCD TV Backlight | Automotive Infotainment Display |
|
Use Scenario: Backlighting a 24-inch HD LCD TV with 16-string configuration (two MP3388SGR-P devices in parallel). IC Role / Device Role / Timing Role: Primary LED current controller with programmable OVP threshold; monitors output via resistor divider to prevent overvoltage during cold-cranking transients. Use Value: Ensures robust operation across 9–16V automotive input range with built-in UVLO (3.9V) and thermal shutdown - no external supervision required. |
Use Scenario: Illuminating a 7-inch automotive cluster display requiring AEC-Q200 compliance and fault logging. IC Role / Device Role / Timing Role: Fault-aware LED driver with VFAULT-controlled PMOS input disconnect; reports open/short faults via pull-down current on VFAULT pin. Use Value: Supports ASIL-B functional safety requirements by isolating input during fault and providing deterministic shutdown behavior without software dependency. |
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; 3% current matching; requires external VREF for ISET. | Lacks FPWM-programmable dimming frequency and integrated OVP divider - needs additional resistors and comparator for open-string protection. | Choose when board space permits larger external components and fixed-frequency operation suffices. |
| ISL97693IRTZ | 9-channel capability; 1.5% current matching; supports I²C interface for dynamic current adjustment; 50V max output. | Includes digital control and diagnostics but consumes more PCB area and requires firmware integration - not drop-in compatible. | Prefer when system-level brightness calibration or channel-by-channel dimming is required beyond analog PWM. |
Compared with RT9397BZSP and ISL97693IRTZ, MP3388SGR-P offers superior analog flexibility (dual PWM modes, selectable fSW, programmable OVP) in the smallest footprint (QFN24), making it optimal for cost-sensitive, space-constrained backlight designs where digital control adds unnecessary complexity.
Availability
MP3388SGR-P is available at Aetrix Electronics and suitable for notebook PCs, tablet computers, and small LCD TV backlighting requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.
Supply support for MP3388SGR-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 design centers in the US, China, and Taiwan, and global manufacturing partnerships.
The MP3388S product line targets high-efficiency, multi-string LED backlight drivers for portable and automotive displays, emphasizing thermal robustness, analog dimming flexibility, and integrated protection - eliminating discrete supervision components.
FAQ
What is the minimum recommended RSET value for MP3388SGR-P?
The minimum RSET is determined by maximum allowable ILED (30mA) and the 1.22V ISET reference: RSET(min) = 1.22V / 0.03A = 40.7kΩ. Using lower resistance risks exceeding per-string current limits and triggering thermal shutdown under sustained load.
Can MP3388SGR-P operate with VIN below 4.3V?
No - the absolute minimum operating VIN is 4.3V per datasheet specifications. At 3.9V (UVLO falling threshold), the device disables. For sub-4.3V systems, an external 5V LDO must supply VCC while VIN remains ≥4.3V, or a different driver (e.g., MP3378) should be selected.
How does open-string protection behave when only one LED string is active?
When only one string is connected and operational, the MP3388SGR-P regulates VOUT to that string's forward voltage plus margin. If that string opens, OVP triggers at programmed threshold, VFAULT pulls low to disconnect input, and the device shuts down - ensuring no uncontrolled voltage rise occurs.
Is the FPWM capacitor value critical for dimming linearity?
Yes - CFPWM directly sets fDPWM (fDPWM = 3.5μF/CFPWM). Deviations cause proportional shift in dimming frequency, affecting perceived flicker and compatibility with camera rolling shutter. Use 1% tolerance C0G/NP0 capacitors for stable 1.2–1.6kHz operation.
What is the purpose of shorting SW1 and SW2 externally?
SW1 and SW2 are paralleled internal MOSFET drains sharing the same gate drive. Shorting them externally halves effective RDS(on) and current density per bond wire, reducing conduction loss and thermal stress - required for full 2A total switch current capability and reliable 55V operation.
Does MP3388SGR-P support analog (DC) dimming without external components?
Yes - applying 0.2V–1.2V directly to PWMO enables DC-input PWM dimming with negative polarity. No external RC filter is needed; the internal circuitry converts the analog level into a DPWM signal whose duty cycle scales linearly with input voltage.
How is thermal performance affected by the exposed pad connection?
The exposed pad is electrically and thermally connected to GND. Soldering it to a ≥100mm² copper pour with ≥4 thermal vias significantly lowers θJA - failure to do so increases junction temperature by up to 35°C at full load, risking premature thermal shutdown.
MP3388SGR-P Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Monolithic Power Systems Inc.
- Series:
- -
- Package/Case:
- 24-VFQFN Exposed Pad
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Type:
- DC DC Regulator
- Topology:
- Step-Up (Boost)
- Internal Switch(s):
- Yes
- Number of Outputs:
- 8
- Voltage - Supply (Min):
- 4.3V
- Voltage - Supply (Max):
- 25V
- Voltage - Output:
- 50V
- Current - Output / Channel:
- 20mA
- Frequency:
- 1.25MHz
- Dimming:
- PWM
- Applications:
- Backlight
- Operating Temperature:
- -40°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 24-QFN (4x4)
MP3388SGR-P FAQ
1.How can I place an order for MP3388SGR-P through Aetrix?
Please submit a Request for Quotation (RFQ) for MP3388SGR-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 MP3388SGR-P reliable?
The price and inventory of MP3388SGR-P are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MP3388SGR-P is usually 5 days.
3.What payment methods are accepted for MP3388SGR-P?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MP3388SGR-P transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MP3388SGR-P?
MP3388SGR-P orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MP3388SGR-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 MP3388SGR-P?
For technical support, including MP3388SGR-P datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MP3388SGR-P requirements.
6.How does Aetrix verify that MP3388SGR-P is sourced from the original manufacturer or authorized distributors?
All MP3388SGR-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 MP3388SGR-P meets industry standards.
7.What is the process for return or replacement of MP3388SGR-P?
All MP3388SGR-P units undergo pre-shipment inspection (PSI). If there is an issue with MP3388SGR-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 MP3388SGR-P part is unused and in its original packaging.
Return procedure for MP3388SGR-P:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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