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Monolithic Power Systems Inc. MP3324GRE-Z
- Part No.:
- MP3324GRE-Z
- Manufacturer:
- Monolithic Power Systems Inc.
- Category:
- LED Drivers
- Package:
- 24-VFQFN
- Datasheet:
-
MP3324GRE-Z.pdf
- Description:
- 8-CHANNEL, 100MA/CH, LED DRIVER
- Quantity:
- Payment:
- Shipping:
Inventory:4,862
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Product details
Overview
MP3324GRE-Z from Monolithic Power Systems is an 8-channel white LED driver IC with independent PWM and analog dimming per channel, I²C interface, and integrated fault protection. It operates from 4V–16V input, delivers up to 100mA per channel (VIN ≥ 4.5V), features 12-bit PWM + 6-bit analog dimming resolution, and supports cascaded configurations via 10 configurable I²C addresses. It is used in automotive instrument clusters requiring precise, synchronized multi-zone backlight control.
For engineers reviewing the MP3324GRE-Z datasheet, MP3324GRE-Z pinout, MP3324GRE-Z application, or MP3324GRE-Z equivalent, key selection considerations include its QFN-24 package thermal performance, RFSH/FLT refresh/fault dual-mode operation, 80μs programmable phase shift for EMI reduction, and configurable LED short/open thresholds for robust display system reliability.
Technical Context
The MP3324GRE-Z integrates eight matched current sinks with external ISET resistor programming and independent digital control per channel. Its I²C interface supports register-level configuration of dimming modes, slew rate (5/10/20μs), PWM frequency (220–330Hz), and refresh signal generation (fREFRESH = 127500 × fPWM / FRFSH).
Protection logic includes latch-off/hiccup-selectable LED open-load (100mV threshold, 4ms delay) and short-load detection (configurable 2–5V threshold), plus over-temperature shutdown at 170°C with 20°C hysteresis. The RFSH/FLT pin serves as either a synchronized LCD refresh output or active-low fault flag, controlled by FLTEN bit.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 4V to 16V - Supports wide-range automotive and industrial DC supplies without external regulation. |
| Max Output Current/Ch | 100mA (VIN ≥ 4.5V) - Enables driving high-brightness WLED strings with minimal external components. |
| PWM Dimming Resolution | 12-bit - Provides 4096-step linear brightness control per channel for smooth grayscale transitions. |
| Analog Dimming Resolution | 6-bit - Allows coarse current scaling (0–63 steps) to reduce low-duty PWM flicker in sensitive applications. |
| I²C Address Options | 10 addresses (0x30–0x39) - Enables daisy-chained control of up to 10 ICs on one bus for large-area displays. |
| Thermal Shutdown Threshold | 170°C - Protects against sustained overload while allowing operation up to +125°C junction temperature. |
| Package | QFN-24 (4mm × 4mm) - Exposed pad enhances thermal dissipation for continuous 100mA/channel operation. |
Pinout & Package
MP3324GRE-Z is housed in a thermally enhanced QFN-24 (4mm × 4mm) package with wettable flanks and an exposed thermal pad. Pin numbering follows standard top-view orientation with pin 1 at top-left corner.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 RFSH/FLT | Refresh output / Fault flag | Dual-function open-drain pin: outputs synchronized rectangular refresh signal when FLTEN=0; pulled low on OLP/SLP/OTP fault when FLTEN=1. |
| 2 EN | Enable control | Active-high logic input; must exceed 2.1V to power up device after VIN UVLO clearance (3.7V typical). |
| 3 SCL | I²C clock | Standard I²C-compatible input supporting up to 1MHz clock frequency with 0.5μs low time minimum. |
| 4 SDA | I²C data | Open-drain bidirectional I²C data line with 50ns setup time requirement for reliable register writes. |
| 5 ADDR | I²C address select | Analog input setting 4 LSB of 7-bit I²C address via resistor divider with RISET; enables 10 unique addresses. |
| 6 ISET | Current reference | Connects to external resistor to set nominal LED current (VISET = 1.2V typ); defines full-scale 100mA per channel. |
| 7,8 LED1 | Channel 1 cathode sink | Dual pins electrically tied internally; both must connect to same LED string cathode for current sharing and thermal balance. |
| 9,10 LED2 | Channel 2 cathode sink | Identical dual-sink structure as LED1; enables redundant routing and lower trace inductance in high-current PCB layouts. |
| 14 GND | Power ground | Primary return path for all LED currents and internal regulators; must be connected directly to thermal pad for θJA = 42°C/W. |
| 24 VIN | Power input | Accepts 4–16V supply; requires local 4.7μF ceramic capacitor to GND for stability and transient suppression. |
Key Features
| Feature | Design Value |
|---|---|
| Independent per-channel dimming | Each of 8 channels supports simultaneous 12-bit PWM + 6-bit analog dimming - eliminates cross-channel interference in segmented backlight zones. |
| Configurable phase shift | 80μs inter-channel delay (PS_EN=1) - reduces peak input current and conducted EMI in multi-string LED arrays. |
| Programmable refresh output | fREFRESH = 127500 × fPWM / FRFSH[9:0] - generates precise LCD panel sync signals without external timing ICs. |
| Selectable protection response | LATCH bit selects hiccup (auto-retry every 1ms) or latch-off (requires EN/VIN cycle) - matches system-level fault recovery strategy. |
| Adjustable short-circuit threshold | STH[1:0] sets VSLP to 2V/3V/4V/5V - accommodates varying LED forward voltage tolerances across production batches. |
Applications
| Automotive Instrument Clusters | Industrial HMI Displays |
|---|---|
Use Scenario: Driving segmented LED backlight behind TFT gauges with variable ambient light compensation. IC Role / Device Role / Timing Role: LED current source with synchronized PWM dimming and refresh signal output for LCD frame alignment. Use Value: 80μs phase shift reduces input ripple current by >30%, easing compliance with CISPR 25 Class 5 conducted emissions limits. |
Use Scenario: Backlighting ruggedized touch panels in factory automation terminals operating at -40°C to +85°C. IC Role / Device Role / Timing Role: Fault-tolerant LED driver with configurable OLP/SLP thresholds and latch-off mode for unattended operation. Use Value: 170°C thermal shutdown and 125°C max operating junction temperature ensure reliability in sealed enclosures without forced air cooling. |
| Medical Diagnostic Displays | Avionics Cockpit Panels |
Use Scenario: High-contrast monochrome display backlight requiring flicker-free dimming down to 0.024% duty cycle. IC Role / Device Role / Timing Role: Dual-mode dimming controller using analog scaling for low-end linearity and 12-bit PWM for mid-to-high range precision. Use Value: Combined 6-bit analog + 12-bit PWM achieves >18-bit effective dimming resolution, eliminating visible stepping in critical imaging UIs. |
Use Scenario: Redundant backlight system for primary flight displays where single-point failure must not cause total loss of illumination. IC Role / Device Role / Timing Role: Cascadable I²C LED driver supporting up to 10 devices per bus for distributed control architecture. Use Value: 10 configurable I²C addresses enable modular design with hot-swappable backlight modules and independent fault reporting per zone. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar LED driver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| IS31FL3729-QFLS4-TR | 18-channel, 40mA max/ch, no analog dimming, only 8-bit PWM; uses proprietary 2-wire interface instead of I²C. | Lacks per-channel analog dimming and refresh output; better suited for low-cost consumer lighting than safety-critical displays. | Choose for cost-sensitive, non-safety applications needing higher channel count but lower precision dimming. |
| TPS61196RGER | Single-channel, 120mA max, no I²C, only analog dimming via CTRL pin; lacks OLP/SLP protection and phase shift. | Requires external multiplexing for multi-channel use; no fault reporting or synchronization capability. | Choose only for simple single-string designs where system-level MCU handles sequencing and protection. |
Compared with IS31FL3729-QFLS4-TR and TPS61196RGER, MP3324GRE-Z uniquely combines per-channel 12-bit PWM + 6-bit analog dimming, integrated refresh signal generation, and configurable protection responses-making it the only option qualified for automotive-grade segmented backlight systems requiring EMI control and fault resilience.
Availability
MP3324GRE-Z is available at Aetrix Electronics and suitable for automotive instrument clusters, industrial HMI displays, and medical diagnostic panels requiring stable component supply across extended temperature ranges and long product lifecycles.
Supply support for MP3324GRE-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 power management ICs, with over two decades of innovation in DC-DC converters, LED drivers, and motor controllers.
The MP3324 belongs to MPS's high-precision LED driver product line, designed specifically for automotive and industrial displays demanding synchronized multi-channel dimming, robust fault handling, and compact thermal packaging.
FAQ
What is the maximum allowable LED string voltage drop across MP3324GRE-Z?
The MP3324GRE-Z supports up to 150mV to 210mV headroom (VLEDx) at 40mA per channel, meaning the maximum forward voltage of the LED string must remain ≤ (VIN − VHEADROOM). At VIN = 12V, this allows up to ~11.8V total LED VF per channel. Exceeding headroom causes current regulation loss and potential OLP triggering.
How does the RFSH/FLT pin behave during normal operation versus fault conditions?
When FLTEN = 0, RFSH/FLT outputs a clean rectangular refresh signal at fREFRESH. When FLTEN = 1 and no fault exists, it remains high-impedance (pulled externally). Upon OLP, SLP, or OTP fault, it is actively pulled low via 100Ω internal FET and holds low until fault bits are read (latch-off) or fault clears (hiccup mode).
Can MP3324GRE-Z drive mixed-color LED strings (e.g., RGB) with independent control?
Yes - each channel operates as an independent constant-current sink. By connecting red, green, and blue LEDs to separate channels and configuring individual ICHx and PWMx registers, full per-color intensity control is achieved. However, forward voltage mismatch between colors must be managed within the 210mV headroom limit.
What is the minimum recommended ISET resistor value and why?
The minimum recommended RISET is 10kΩ, corresponding to ~120mA per channel (VISET = 1.2V / 10kΩ). Lower values risk exceeding absolute max ratings under worst-case VISET tolerance (+2.6%) and thermal derating above 85°C ambient, potentially triggering OTP prematurely.
Does MP3324GRE-Z support daisy-chaining without level shifters on I²C lines?
Yes - all MP3324GRE-Z units share the same I²C voltage domain (1.3V–5V logic high). With proper pull-up resistors (typically 2.2kΩ to 3.3V), up to 10 devices can be cascaded on one bus using unique ADDR-configured addresses (0x30–0x39), eliminating need for level shifters or bus buffers.
How is the 80μs phase shift implemented and what design benefit does it provide?
Phase shift is enabled via PS_EN bit and applies fixed 80μs delay between rising edges of consecutive channels (LED1→LED2→…→LED8). This staggers current draw, reducing peak input current by up to 45% and lowering RMS input capacitor ripple current - directly easing EMI filter sizing and cost.
What happens to LED current during thermal shutdown and how quickly does recovery occur?
At 170°C junction temperature, OTP triggers: all channels disable immediately, RFSH/FLT pulls low, and FT_OTP bit sets. Recovery begins when die cools to ~150°C (20°C hysteresis), restoring full operation without reset. Full thermal cycle duration depends on PCB copper area and airflow but typically takes 100–500ms in standard 4-layer designs.
MP3324GRE-Z Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Monolithic Power Systems Inc.
- Series:
- -
- Package/Case:
- 24-VFQFN
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Type:
- Linear
- Topology:
- -
- Internal Switch(s):
- Yes
- Number of Outputs:
- 8
- Voltage - Supply (Min):
- 4V
- Voltage - Supply (Max):
- 16V
- Voltage - Output:
- -
- Current - Output / Channel:
- 100mA
- Frequency:
- -
- Dimming:
- Analog, PWM
- Applications:
- General Purpose
- Operating Temperature:
- -40°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount, Wettable Flank
- Supplier Device Package:
- 24-QFN (4x4)
MP3324GRE-Z FAQ
1.How can I place an order for MP3324GRE-Z through Aetrix?
Please submit a Request for Quotation (RFQ) for MP3324GRE-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 MP3324GRE-Z reliable?
The price and inventory of MP3324GRE-Z are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MP3324GRE-Z is usually 5 days.
3.What payment methods are accepted for MP3324GRE-Z?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MP3324GRE-Z transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MP3324GRE-Z?
MP3324GRE-Z orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MP3324GRE-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 MP3324GRE-Z?
For technical support, including MP3324GRE-Z datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MP3324GRE-Z requirements.
6.How does Aetrix verify that MP3324GRE-Z is sourced from the original manufacturer or authorized distributors?
All MP3324GRE-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 MP3324GRE-Z meets industry standards.
7.What is the process for return or replacement of MP3324GRE-Z?
All MP3324GRE-Z units undergo pre-shipment inspection (PSI). If there is an issue with MP3324GRE-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 MP3324GRE-Z part is unused and in its original packaging.
Return procedure for MP3324GRE-Z:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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