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Monolithic Power Systems Inc. MPQ3326GR-AEC1-Z
- Part No.:
- MPQ3326GR-AEC1-Z
- Manufacturer:
- Monolithic Power Systems Inc.
- Category:
- LED Drivers
- Package:
- 24-PowerVFQFN
- Datasheet:
-
MPQ3326GR-AEC1-Z.pdf
- Description:
- IC LED DRVR LIN PWM 50MA 24QFN
- Quantity:
- Payment:
- Shipping:
Inventory:4,770
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Product details
Overview
MPQ3326GR-AEC1-Z from Monolithic Power Systems is a 16-channel automotive-grade LED driver with independent PWM and analog dimming per channel, 4V–16V input range, 50mA/channel max current (VIN ≥ 4.5V), I²C interface supporting up to 10 cascaded devices, and AEC-Q100 Grade 1 qualification - deployed in instrument clusters and automotive displays requiring precise multi-zone brightness control.
For engineers reviewing the MPQ3326GR-AEC1-Z datasheet, MPQ3326GR-AEC1-Z pinout, MPQ3326GR-AEC1-Z application, or MPQ3326GR-AEC1-Z equivalent, key selection criteria include per-channel 12-bit PWM + 6-bit analog dimming resolution, configurable LED current slew rate (5/10/20 µs), 40 µs inter-channel phase shift for EMI reduction, and integrated open/short/OTP protection with fault register reporting via RFSH/FLT pin.
Technical Context
The MPQ3326 employs 16 matched internal current sinks with external ISET resistor programming, enabling precise per-string current setting up to 50mA. Its dual-dimming architecture allows simultaneous analog amplitude scaling (6-bit, 0–100% ILED) and PWM duty modulation (12-bit, 0–100%) on each channel - decoupled for flicker-free mixed-mode operation.
It integrates an I²C controller with 10 address options (0x30–0x39) set by ADDR-to-GND resistor ratio, supports refresh signal generation (285–315 Hz default) via RFSH/FLT pin, and implements hiccup- or latch-off fault response modes for LED open/short detection with user-configurable thresholds (e.g., 3V short threshold) and 4ms detection delay.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 4V to 16V - supports direct connection to automotive battery rails including cold-crank (4.5V min operational) and load-dump transients. |
| Max Output Current/Ch | 50mA (VIN ≥ 4.5V) - set by external ISET resistor; headroom voltage ≤210mV at 20mA ensures low dropout in high-side LED configurations. |
| PWM Dimming Resolution | 12-bit (0–4095 steps) - enables <0.97µs duty step at 250Hz for ultra-fine brightness gradation without visible stepping. |
| Analog Dimming Resolution | 6-bit (0–63 steps) - provides linear current amplitude scaling independent of PWM timing, eliminating low-duty flicker. |
| PWM Frequency Options | 220Hz / 250Hz / 280Hz / 330Hz - selectable via register; 250Hz default avoids audible noise while maintaining EMI compliance. |
| Thermal Protection | 170°C shutdown with 20°C hysteresis - prevents thermal runaway during sustained high-current operation in enclosed automotive enclosures. |
| Package | QFN-24 (4mm × 4mm, 0.5mm pitch) - thermally enhanced exposed pad supports >2.9W power dissipation at TA = 25°C. |
Pinout & Package
MPQ3326GR-AEC1-Z is housed in a thermally optimized QFN-24 (4mm × 4mm) package with exposed thermal pad. Pin 1 is marked by dot; top view orientation follows standard MPS QFN layout.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 RFSH/FLT | Refresh output / Fault flag | Configurable as synchronized LCD refresh signal (default) or active-low open-drain fault indicator; asserts low on OTP, LED open/short, or UVLO. |
| 2 EN | Enable control | Active-high logic input; must exceed 2.1V to enable IC after VIN exceeds UVLO (3.7V typ); pulls down internally when disabled. |
| 3 SCL | I²C clock input | Supports 10–1000 kHz clock; includes internal pull-down; requires external pull-up to 3.3V or 5V. |
| 4 SDA | I²C data bidirectional | Open-drain I²C bus line; compatible with standard I²C masters; VOL ≤0.4V at 3mA sink. |
| 5 ADDR | I²C address configuration | Resistor-to-GND sets 4 LSB of I²C address (0x30–0x39); 10 discrete ratios supported per datasheet Table 2. |
| 6 ISET | Current reference input | Connects to external resistor (e.g., 20kΩ) to GND; sets nominal 25mA per channel; VISET = 1.2V ±2.5%. |
| 7–23 LED1–LED16 | LED string current sinks | 16 independent cathode-connected current outputs; each sinks up to 50mA with ≤210mV headroom at 20mA. |
| 14 GND | Power and signal ground | Primary ground return; must be connected to exposed thermal pad for thermal and electrical integrity. |
| 24 VIN | Main supply input | 4V–16V input; requires local 10µF ceramic bypass capacitor; UVLO threshold = 3.7V (rising edge). |
Key Features
| Feature | Design Value |
|---|---|
| Separated PWM + analog dimming | Independent 12-bit PWM duty and 6-bit analog current scaling per channel eliminates flicker at low brightness and enables smooth transitions. |
| Configurable LED current slew rate | 5µs / 10µs / 20µs rising/falling edge control reduces di/dt-induced EMI without compromising dimming speed. |
| 40µs inter-channel phase shift | Programmable staggered PWM edges across 16 channels lowers peak input current and eases EMI filter design. |
| Integrated fault diagnostics | Dedicated open/short/OTP fault registers (CHxO/CHxS/FT_OTP) and RFSH/FLT pin reporting enable real-time system-level health monitoring. |
| 10-cascadable I²C addresses | ADDR resistor selects one of ten unique I²C addresses (0x30–0x39), allowing up to 160 total LED channels per bus without address conflict. |
Applications
| Automotive Instrument Clusters | Automotive Central Displays |
|---|---|
|
Use Scenario: Backlighting segmented TFT LCDs with variable-brightness zones (e.g., speedometer, tachometer, warning icons). IC Role / Device Role / Timing Role: 16-channel current sink driving individual LED strings; I²C registers configure per-zone dimming curves and refresh sync to display frame rate. Use Value: Enables dynamic contrast mapping and adaptive ambient light compensation while meeting AEC-Q100 Grade 1 reliability for 15-year vehicle lifetime. |
Use Scenario: Edge-lit backlight for 10–12 inch infotainment displays with local dimming for HDR effect. IC Role / Device Role / Timing Role: Drives 16 parallel LED strings behind diffuser; phase-shifted PWM minimizes input ripple; RFSH output synchronizes with display controller VSYNC. Use Value: Achieves >10,000:1 contrast ratio via per-zone dimming while reducing conducted EMI by 12dB over non-phase-shifted implementation. |
| Automotive Exterior Lighting Control | Industrial HMI Panels |
|
Use Scenario: Adaptive daytime running lights (DRL) with sequential turn indication using multi-segment LED arrays. IC Role / Device Role / Timing Role: Controls 16 independent LED segments; I²C enables real-time pattern updates; fault registers detect open-circuit LEDs for fail-safe reporting. Use Value: Supports ASIL-B functional safety requirements through diagnostic coverage (open/short/OTP) and latch-off fault mode for critical lighting functions. |
Use Scenario: High-reliability operator interface panels in factory automation with harsh temperature cycling (-40°C to +85°C). IC Role / Device Role / Timing Role: Provides stable LED current regulation across wide input voltage (12V/24V systems); UVLO and OTP ensure graceful degradation under brownout or overload. Use Value: Eliminates need for external current-sense resistors or microcontroller-based dimming firmware, reducing BOM count and qualification effort. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar 16-channel automotive LED driver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| IS31FL3729-QFLS4-TR | 18-channel, 40mA/ch, no analog dimming; only 8-bit PWM; no RFSH output or phase shift. | Lacks separated dimming and refresh sync - unsuitable for flicker-sensitive instrument clusters. | Prefer MPQ3326GR-AEC1-Z where per-channel analog dimming and EMI-optimized phase shift are required. |
| TLC6C5912QPWRQ1 | 12-channel, 120mA/ch, no I²C; SPI-only interface; no integrated protection or dimming registers. | Requires external MCU firmware for dimming control and fault handling - increases software validation burden. | Choose MPQ3326GR-AEC1-Z for integrated I²C register map, self-contained diagnostics, and AEC-Q100-compliant protection logic. |
Compared with IS31FL3729-QFLS4-TR and TLC6C5912QPWRQ1, MPQ3326GR-AEC1-Z uniquely delivers 12-bit+6-bit dual-dimming resolution, programmable slew rate and phase shift for EMI control, and hardware-enforced fault reporting - all in a single AEC-Q100 Grade 1 device with minimal external components.
Availability
MPQ3326GR-AEC1-Z is available at Aetrix Electronics and suitable for automotive instrument clusters, central displays, and industrial HMI panels requiring stable component supply, long-term lifecycle support, and AEC-Q100-compliant performance.
Supply support for MPQ3326GR-AEC1-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 core expertise in DC/DC converters, LED drivers, and motor drivers for automotive, industrial, and consumer markets.
The MPQ3326 belongs to MPS's AEC-Q100-qualified LED driver product line, designed specifically for automotive cabin lighting and display backlighting applications demanding high channel count, precision dimming, and robust fault resilience.
FAQ
What is the maximum number of MPQ3326GR-AEC1-Z devices that can be cascaded on a single I²C bus?
Up to 10 MPQ3326GR-AEC1-Z devices can be cascaded on one I²C bus. Each device uses a unique 4-bit I²C address (A3–A0) set by the resistor ratio between ADDR and ISET pins, yielding addresses 0x30 through 0x39. No external address jumpers or DIP switches are required - configuration is resistor-based and deterministic.
How does the MPQ3326GR-AEC1-Z implement separated PWM and analog dimming?
Each of the 16 channels has two independent 6-bit analog dimming registers (ICHx) and 12-bit PWM dimming registers (PWMx). Analog dimming scales the current amplitude (ILED = ISET × ICHx/63), while PWM dimming modulates duty cycle (D = PWMx/4095) at fixed frequency. Both operate simultaneously without interference, enabling flicker-free dimming down to 0.024% duty.
What protection features are integrated, and how are faults reported?
The device integrates LED open detection (100mV threshold, 4ms delay), LED short detection (configurable 2–5V threshold), over-temperature shutdown (170°C), and input UVLO (3.7V). Faults set dedicated bits in registers 0x06–0x09 and pull the RFSH/FLT pin low. Reading the fault register clears the flag and releases the pin if FLTEN = 1.
Can the RFSH/FLT pin be used simultaneously for refresh signaling and fault indication?
No - the RFSH/FLT pin operates in mutually exclusive modes controlled by the FLTEN bit (Register 0x01, bit 7). When FLTEN = 0, it outputs a programmable refresh signal (285–315 Hz default); when FLTEN = 1, it becomes an active-low fault flag. The function cannot be time-multiplexed or combined.
What is the minimum recommended ISET resistor value, and how does it affect channel current accuracy?
The minimum recommended ISET resistor is 10kΩ (yielding ~50mA max per channel at VIN ≥ 4.5V). Lower values increase current but reduce VISET regulation accuracy due to internal reference tolerance (±2.5%). At 20kΩ (25mA nominal), current accuracy is ±2% over temperature; at 10kΩ, it degrades to ±3% due to increased sensitivity to resistor tolerance and layout parasitics.
Does the MPQ3326GR-AEC1-Z support daisy-chained I²C addressing without external level shifters?
Yes - all I²C pins (SCL, SDA, ADDR) are 5V-tolerant and operate at standard I²C logic levels (VIH ≥ 1.3V, VIL ≤ 0.4V). No level shifters are needed when interfacing with 3.3V or 5V microcontrollers. The device meets I²C specification for bus capacitance (400pF max) and supports standard start/stop/repeated-start timing.
How is thermal performance affected by PCB layout, and what is the recommended copper area for the exposed pad?
The QFN-24 exposed thermal pad must be soldered to ≥200 mm² of inner/outer layer copper connected via ≥6 thermal vias (0.3mm diameter) to internal ground planes. With this layout, θJA drops from 42°C/W (JEDEC 4-layer board) to ≤30°C/W, enabling full 50mA/channel operation at TA = 85°C without thermal derating.
MPQ3326GR-AEC1-Z Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Monolithic Power Systems Inc.
- Series:
- -
- Package/Case:
- 24-PowerVFQFN
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Type:
- Linear
- Topology:
- -
- Internal Switch(s):
- Yes
- Number of Outputs:
- 16
- Voltage - Supply (Min):
- 4V
- Voltage - Supply (Max):
- 16V
- Voltage - Output:
- -
- Current - Output / Channel:
- 50mA
- Frequency:
- -
- Dimming:
- Analog, I2C, PWM
- Applications:
- -
- Operating Temperature:
- -40°C ~ 150°C (TJ)
- Grade:
- Automotive
- Qualification:
- AEC-Q100
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 24-QFN (4x4)
MPQ3326GR-AEC1-Z FAQ
1.How can I place an order for MPQ3326GR-AEC1-Z through Aetrix?
Please submit a Request for Quotation (RFQ) for MPQ3326GR-AEC1-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 MPQ3326GR-AEC1-Z reliable?
The price and inventory of MPQ3326GR-AEC1-Z are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MPQ3326GR-AEC1-Z is usually 5 days.
3.What payment methods are accepted for MPQ3326GR-AEC1-Z?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MPQ3326GR-AEC1-Z transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MPQ3326GR-AEC1-Z?
MPQ3326GR-AEC1-Z orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MPQ3326GR-AEC1-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 MPQ3326GR-AEC1-Z?
For technical support, including MPQ3326GR-AEC1-Z datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MPQ3326GR-AEC1-Z requirements.
6.How does Aetrix verify that MPQ3326GR-AEC1-Z is sourced from the original manufacturer or authorized distributors?
All MPQ3326GR-AEC1-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 MPQ3326GR-AEC1-Z meets industry standards.
7.What is the process for return or replacement of MPQ3326GR-AEC1-Z?
All MPQ3326GR-AEC1-Z units undergo pre-shipment inspection (PSI). If there is an issue with MPQ3326GR-AEC1-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 MPQ3326GR-AEC1-Z part is unused and in its original packaging.
Return procedure for MPQ3326GR-AEC1-Z:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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