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Monolithic Power Systems Inc. MP3324GRE-P
- Part No.:
- MP3324GRE-P
- Manufacturer:
- Monolithic Power Systems Inc.
- Category:
- LED Drivers
- Package:
- 24-VFQFN
- Datasheet:
-
MP3324GRE-P.pdf
- Description:
- 8-CHANNEL, 100MA/CH, LED DRIVER
- Quantity:
- Payment:
- Shipping:
Inventory:487
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Product details
Overview
MP3324GRE-P 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. Used in automotive instrument clusters for precise backlight control with EMI-reduced phase-shifted dimming.
For engineers reviewing the MP3324GRE-P datasheet, MP3324GRE-P pinout, MP3324GRE-P application, or MP3324GRE-P equivalent, key selection criteria include per-channel dimming independence, refresh signal generation for LCD synchronization, LED open/short protection thresholds, thermal shutdown behavior, and QFN-24 package thermal performance under sustained 100mA/channel load.
Technical Context
The MP3324GRE-P integrates eight matched current sinks with external ISET resistor programming and dual-stage dimming control: a 6-bit DAC adjusts LED current amplitude (0–100% in 1.59% steps), while a 12-bit PWM counter modulates duty cycle (0–100% in 0.024% steps) at selectable frequencies (220/250/280/330Hz). Its I²C register map enables per-channel enable/disable, fault masking, and dynamic slew rate control (5/10/20μs).
Protection logic uses dedicated comparators for LED open-load (VLEDx < 100mV for 4ms) and short-load (VLEDx > 2–5V threshold for 4ms), with hiccup or latch-off response selected via LATCH bit. The RFSH/FLT pin serves dual mode: synchronized refresh output (fREFRESH = 127500 × fPWM / FRFSH) when FLTEN = 0, or active-low fault flag when FLTEN = 1.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 4V–16V: Supports 5V/12V rail systems without external regulators; UVLO rising/falling thresholds at 3.7V/3.5V prevent brownout oscillation. |
| Max Output Current/Ch | 100mA (VIN ≥ 4.5V): Enables driving high-brightness WLED strings; headroom voltage ≤210mV at 40mA ensures low dropout operation. |
| PWM Dimming Resolution | 12-bit (4096 steps): Enables flicker-free dimming down to 0.024% duty cycle for ultra-low-light instrument cluster backlighting. |
| Analog Dimming Resolution | 6-bit (64 steps): Provides coarse current scaling for power optimization before fine PWM adjustment; ILED = (ICHx/63) × ISET. |
| I²C Address Options | 10 addresses (0x30–0x39): Allows daisy-chained multi-driver architectures in large display backlights without address conflict. |
| Thermal Protection | OTP at 170°C with 20°C hysteresis: Prevents permanent damage during transient overloads; automatic recovery at ~150°C avoids system reset. |
| Package Thermal Resistance | θJA = 42°C/W (QFN-24): Enables 2.97W max dissipation at 25°C ambient; requires 2-layer PCB copper pour for full 100mA/channel capability. |
Pinout & Package
MP3324GRE-P is housed in a wettable-flank QFN-24 (4mm × 4mm, 0.5mm pitch) package optimized for automated optical inspection and thermal dissipation. Exposed thermal pad must be soldered to PCB ground plane.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 RFSH/FLT | Refresh output / Fault flag | Open-drain output: drives LCD refresh sync signal (fREFRESH) when FLTEN=0; pulls low on OLP/SLP/OTP fault when FLTEN=1. |
| 2 EN | Enable control | Active-high digital input: powers up all channels when pulled ≥2.1V; disables output and resets registers when <0.8V. |
| 3 SCL, 4 SDA | I²C interface | Standard-mode (10–1000kHz) bidirectional bus: supports register read/write for dimming, protection, and configuration without additional GPIO. |
| 5 ADDR | I²C address select | Analog input biased by internal current source: resistor divider with GND sets 4 LSB of 7-bit address (0x30–0x39). |
| 6 ISET | Current reference | Analog input: connects external resistor to GND to set nominal ILED (VISET = 1.2V ±2.2%); defines full-scale current for all 8 channels. |
| 7,8–22,23 LED1–LED8 | LED cathode sinks | Paired pins per channel (e.g., LED1 pins 7 & 8): each pair must be shorted externally to drive single LED string; parallel routing reduces trace inductance. |
| 14 GND | Power/Signal ground | Common return for VIN, ISET, ADDR, and all LED sinks: requires low-inductance connection to thermal pad for stable regulation. |
| 24 VIN | Power input | 4–16V supply input: requires ≥10μF ceramic capacitor to GND near pin to suppress switching noise and support peak current demands. |
Key Features
| Feature | Design Value |
|---|---|
| Independent per-channel dimming | Each of 8 channels has dedicated 6-bit analog + 12-bit PWM registers, enabling unique brightness profiles for segmented displays without software interpolation. |
| Configurable phase shift | 80μs inter-channel delay (PS_EN=1) staggers LED current edges to reduce peak input current and conducted EMI by >15dB in 150kHz–30MHz band. |
| Programmable SLP threshold | STH[1:0] selects VSLP = 2V/3V/4V/5V, allowing adaptation to different LED forward voltage tolerances and preventing false triggers in high-temperature environments. |
| Adjustable current slew rate | SLEW[1:0] sets ILED rise/fall time to 5/10/20μs, enabling trade-off between EMI reduction and dimming transition speed for specific EMC test limits. |
| Refresh signal generation | fREFRESH = 127500 × fPWM / FRFSH[9:0] provides synchronous timing for LCD gate drivers, eliminating frame tearing in automotive TFT displays. |
Applications
| Automotive Instrument Clusters | Industrial HMI Displays |
|---|---|
Use Scenario: Backlighting for TFT-LCD gauges with variable ambient light conditions and ASIL-B functional safety requirements. IC Role / Device Role / Timing Role: LED driver providing isolated, fault-monitored current regulation per segment; RFSH/FLT synchronizes with display controller's vertical blanking interval. Use Value: 12-bit PWM dimming eliminates visible flicker at low brightness; OLP/SLP detection prevents single-point failure from disabling entire cluster illumination. | Use Scenario: High-reliability operator interface panels in factory automation with wide temperature (-40°C to +85°C) and vibration exposure. IC Role / Device Role / Timing Role: Centralized LED driver managing status indicators, warning lights, and touch feedback LEDs across multiple PCB zones. Use Value: Cascadable I²C addressing (10 devices) simplifies BOM consolidation; OTP and UVLO ensure continuous operation during power transients on 24V industrial rails. |
| Medical Diagnostic Displays | Avionics Cockpit Lighting |
Use Scenario: Calibration-critical imaging monitors requiring precise grayscale tracking and zero flicker across 0.1–100% luminance range. IC Role / Device Role / Timing Role: Precision current source with 6-bit analog pre-scaling followed by 12-bit PWM fine-tuning for linear luminance response. Use Value: VISET tolerance (±2.2%) and channel-to-channel matching (<±3%) ensure consistent color point across multi-zone backlights without per-unit calibration. | Use Scenario: Redundant lighting control in flight deck displays where EMI immunity and fault isolation are mandated by DO-160G Section 20. IC Role / Device Role / Timing Role: Dual-die implementation (not applicable here) replaced by single MP3324GRE-P with phase-shifted dimming to meet radiated emissions limits. Use Value: 80μs phase shift reduces peak current harmonics; RFSH/FLT fault signaling interfaces directly with aircraft health monitoring systems via discrete inputs. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar LED driver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| IS31FL3728-QFLS4-TR | 16-channel, 40mA/ch, no analog dimming, only 8-bit PWM; I²C address fixed at 0x60–0x6F. | Lacks per-channel analog dimming and refresh output; suited for indicator LEDs, not high-fidelity backlighting. | Select when channel count >8 is required and dimming resolution <12-bit is acceptable; verify thermal derating at 40mA/ch in same QFN package. |
| TPS61196RGER | 8-channel, 100mA/ch, but only 8-bit PWM + no analog dimming; integrated boost converter (up to 38V); no I²C, only PWM/EN control. | Requires external MCU for dimming sequencing; lacks fault reporting and refresh signal; better for space-constrained boost-based designs. | Select when input voltage <4V (e.g., 3.3V systems) necessitates boost conversion; avoid if I²C configurability or fault diagnostics are mandatory. |
Compared with IS31FL3728-QFLS4-TR and TPS61196RGER, MP3324GRE-P uniquely combines 12-bit PWM + 6-bit analog dimming, programmable refresh output, and cascaded I²C addressing-making it optimal for automotive and medical displays demanding flicker-free, fault-aware, and synchronized backlight control.
Availability
MP3324GRE-P is available at Aetrix Electronics and suitable for automotive instrument clusters, industrial HMI displays, medical diagnostic monitors, and avionics cockpit lighting requiring stable component supply, long-term lifecycle assurance, and RoHS-compliant manufacturing.
Supply support for MP3324GRE-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 power management ICs, including DC/DC converters, LED drivers, motor drivers, and battery management solutions.
The MP3324 product line targets automotive-grade display backlighting with integrated diagnostics, EMI mitigation, and multi-device scalability-designed specifically for instrument clusters, center stack displays, and HUD systems requiring ASIL-ready reliability.
FAQ
What is the minimum input voltage required to sustain 100mA per channel?
The MP3324GRE-P guarantees 100mA per channel only when VIN ≥ 4.5V, as specified in the Absolute Maximum Ratings table. Below 4.5V, output current degrades due to reduced headroom across the internal current sinks; at VIN = 4.0V, maximum ILED drops to approximately 85mA per channel based on typical VLEDx headroom of 210mV.
How does the RFSH/FLT pin behave during simultaneous LED open and short faults?
When both OLP and SLP occur concurrently, the RFSH/FLT pin pulls low immediately upon first fault detection (whichever occurs first), and remains low until all fault conditions clear and corresponding fault registers (CHxO/CHxS bits) are read via I²C. The FLTEN bit must be set to 1 to activate this fault-flag behavior; otherwise, RFSH/FLT outputs the configured refresh signal regardless of faults.
Can the MP3324GRE-P drive LEDs with forward voltages exceeding 16V?
No-the MP3324GRE-P is a constant-current sink driver with no internal boost circuitry; its VLEDx rating is limited to 18V absolute maximum, but practical operation requires VIN > VLEDx + headroom (≥210mV). For LED strings with total Vf > 16V, an external boost converter must supply VIN, and the MP3324GRE-P regulates current only within its 4–16V input range.
What is the impact of enabling PS_EN on total power consumption?
Enabling phase shift (PS_EN = 1) introduces no measurable increase in quiescent current (IQ = 4mA typical) or switching losses, as it only delays internal PWM edge timing without altering current magnitude or frequency. The 80μs delay is implemented digitally in the control logic and does not affect thermal performance or efficiency.
How is the I²C address determined when RADDR is unconnected?
With ADDR pin floating (no RADDR resistor), the internal bias current pulls ADDR to a default voltage level corresponding to I²C address 0x30. This is the factory-default address; however, MPS strongly recommends connecting RADDR to GND via a precision resistor to ensure deterministic addressing in multi-device systems and avoid bus contention.
Does the MP3324GRE-P support daisy-chaining without external level shifters?
Yes-daisy-chaining up to 10 MP3324GRE-P devices on a single I²C bus requires no level shifters, as all units share identical VIL/VIH thresholds (0–0.4V low, 1.3V+ high) and operate from the same VIN rail. Pull-up resistors must be sized for total bus capacitance (≤400pF), typically 2.2kΩ for ≤5 devices or 1kΩ for full 10-device chain.
What happens to LED current during thermal shutdown recovery?
Upon OTP trigger at 170°C, all channels disable immediately and RFSH/FLT pulls low. When junction temperature falls to ~150°C (20°C hysteresis), the device automatically resumes operation using stored register values-no I²C reinitialization is needed. LED current ramps up smoothly via internal soft-start logic to prevent inrush current spikes.
MP3324GRE-P 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-P FAQ
1.How can I place an order for MP3324GRE-P through Aetrix?
Please submit a Request for Quotation (RFQ) for MP3324GRE-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 MP3324GRE-P reliable?
The price and inventory of MP3324GRE-P are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MP3324GRE-P is usually 5 days.
3.What payment methods are accepted for MP3324GRE-P?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MP3324GRE-P transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MP3324GRE-P?
MP3324GRE-P orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MP3324GRE-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 MP3324GRE-P?
For technical support, including MP3324GRE-P datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MP3324GRE-P requirements.
6.How does Aetrix verify that MP3324GRE-P is sourced from the original manufacturer or authorized distributors?
All MP3324GRE-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 MP3324GRE-P meets industry standards.
7.What is the process for return or replacement of MP3324GRE-P?
All MP3324GRE-P units undergo pre-shipment inspection (PSI). If there is an issue with MP3324GRE-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 MP3324GRE-P part is unused and in its original packaging.
Return procedure for MP3324GRE-P:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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