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Monolithic Power Systems Inc. MP3326AGRE-Z
- Part No.:
- MP3326AGRE-Z
- Manufacturer:
- Monolithic Power Systems Inc.
- Category:
- LED Drivers
- Package:
- 24-VFQFN
- Datasheet:
-
MP3326AGRE-Z.pdf
- Description:
- 16 CHANNELS,80MA/CH, LED DRIVER
- Quantity:
- Payment:
- Shipping:
Inventory:2,204
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Product details
Overview
MP3326AGRE-Z from Monolithic Power Systems is a 16-channel, 80mA-per-channel LED driver IC with independent PWM and analog dimming per channel, digital I²C interface (10 configurable addresses), and integrated fault reporting via RFSH/FLT pin. It operates from 4.5V to 16V input, supports cascaded configurations for large LED arrays, and delivers precise current regulation for RGB backlighting and instrument clusters.
For engineers reviewing the MP3326AGRE-Z datasheet, MP3326AGRE-Z pinout, MP3326AGRE-Z application, or MP3326AGRE-Z equivalent, key selection considerations include its 12-bit PWM + 6-bit analog dimming resolution, 40μs channel phase shift for EMI reduction, QFN-24 wettable flank package, and configurable LED short/open protection thresholds.
Technical Context
The MP3326AGRE-Z integrates 16 matched current sinks with external ISET resistor programming, enabling uniform brightness across all channels. Its digital interface uses standard I²C protocol (10–1000 kHz clock) with address configuration via ADDR pin resistor ratio, supporting up to 10 daisy-chained devices without address conflict.
Each channel features independent 12-bit PWM dimming (220–330 Hz selectable frequency) and 6-bit analog dimming, with programmable slew rate (5/10/20 μs) and 40 μs inter-channel phase shift to suppress peak current harmonics. Fault detection includes LED open (<150 mV, 4 ms timeout), LED short (>3 V threshold, configurable), and over-temperature (170°C trip, 20°C hysteresis).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 4.5V to 16V - Supports wide-range DC power rails including automotive 12V and industrial 5V/7.2V supplies. |
| Max Output Current/Channel | 80mA - Enables driving high-brightness LEDs in parallel strings or single-LED configurations without external boost. |
| PWM Dimming Resolution | 12-bit (4096 steps) - Delivers fine-grained brightness control for smooth grayscale transitions in displays. |
| Analog Dimming Resolution | 6-bit (64 steps) - Provides coarse current scaling for power-efficient dimming at low light levels. |
| Digital Interface | I²C-compatible, 10 configurable addresses - Allows scalable multi-driver systems without address collision or bus contention. |
| Thermal Protection | 170°C shutdown with 20°C hysteresis - Ensures safe operation under sustained load or poor PCB thermal design. |
| Package | QFN-24 (4mm × 4mm) with wettable flanks - Supports automated optical inspection (AOI) and reliable solder joint formation in high-volume SMT assembly. |
Pinout & Package
The MP3326AGRE-Z is housed in a thermally enhanced QFN-24 (4mm × 4mm) package with wettable flanks for improved solderability and AOI capability. Exposed thermal pad on underside improves heat dissipation in compact LED driver layouts.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 RFSH/FLT | Refresh signal output / fault flag | Open-drain output: drives low on fault (OTP, LED open/short); outputs synchronized refresh signal when FLTEN=0. |
| 2 EN | Enable control | Active-high logic input; must exceed 2.1V to activate driver and enable digital interface communication. |
| 3 SCL | I²C clock input | Accepts 10–1000 kHz clock; timing-critical for register writes including FPWM and FRFSH updates. |
| 4 SDA | I²C data I/O | Bi-directional data line; requires external pull-up; supports readback of fault registers (e.g., FAU_OP1/2). |
| 5 ADDR | Address configuration | Sets 4 LSB of I²C address via resistor-to-GND ratio; enables 10 unique addresses for cascading. |
| 6 ISET | Current reference input | Connects to external resistor (e.g., 15kΩ for 80mA); internal 1.2V reference sets full-scale current. |
| 7–23 LED1–LED16 | Current sink outputs | 16 individual cathode-connected outputs; each sinks up to 80mA with ≤400mV headroom at full load. |
| 14 GND | Power and signal ground | Common return for VIN decoupling, ISET, ADDR, and all LED sinks; must be low-impedance plane. |
| 24 VIN | Main power supply input | 4.5–16V input; requires local ceramic capacitor (≥10μF) between VIN and GND for stability and transient response. |
Key Features
| Feature | Design Value |
|---|---|
| Independent dual-dimming per channel | Simultaneous 12-bit PWM + 6-bit analog control allows hybrid dimming strategies-e.g., analog for coarse power reduction and PWM for flicker-free fine tuning. |
| Configurable LED protection thresholds | STH[1:0] register selects LED short detection at 2V/3V/4V/5V; VOLP fixed at ~100mV for open detection-enables robust fault handling across varied LED forward voltages. |
| EMI-reduction phase shift | 40μs inter-channel PWM edge offset spreads switching energy across time, lowering peak radiated emissions without requiring additional filtering components. |
| Programmable current slew rate | SLEW[1:0] register sets rising/falling edge rates (5/10/20 μs) to limit di/dt-induced noise during PWM transitions. |
| Refresh signal generation | RFSH/FLT outputs synchronized rectangular waveform (fREFRESH = 127500/(FRFSH × fPWM))-directly usable as LCD panel refresh trigger without external timing circuitry. |
Applications
| RGB Backlighting | Automotive Instrument Clusters |
|---|---|
Use Scenario: Driving red/green/blue LED strings behind TFT-LCD panels in monitors and TVs to achieve wide color gamut and dynamic contrast. IC Role / Device Role / Timing Role: Primary current-regulated LED driver with per-channel dimming control; provides synchronized refresh output for LCD gate driver timing alignment. Use Value: 12-bit PWM resolution ensures >4000 grayscale levels per primary color; phase-shifted dimming reduces conducted EMI that could interfere with display video signals. | Use Scenario: Illuminating segmented or dot-matrix gauges, warning icons, and status indicators in vehicle dashboards with high reliability and thermal resilience. IC Role / Device Role / Timing Role: High-integration LED driver with built-in open/short fault detection and latch-off/hiccup mode selection-critical for ASIL-B compatible lighting systems. Use Value: Configurable 3V LED short threshold and 4ms timeout prevent false trips from transient voltage spikes; wettable flank QFN ensures solder joint integrity in automotive thermal cycling. |
| Industrial HMI Displays | Medical Device Indicators |
Use Scenario: Powering status LEDs, bar graphs, and backlight elements in ruggedized human-machine interface panels used in factory automation and control cabinets. IC Role / Device Role / Timing Role: Centralized LED management IC with I²C daisy-chaining support-reduces MCU GPIO count and simplifies firmware for multi-zone illumination control. Use Value: 10 configurable I²C addresses allow up to 10 MP3326A drivers on one bus, enabling scalable control of >160 LEDs from a single microcontroller interface. | Use Scenario: Driving critical alert LEDs and parameter-display backlights in portable diagnostic equipment where visual clarity and fault transparency are essential. IC Role / Device Role / Timing Role: Safety-aware LED driver with active-low fault flag (RFSH/FLT) and readable fault registers-supports real-time diagnostics and fail-safe UI behavior. Use Value: Fault register readback (e.g., FAU_OP1/2, FAU_SH1/2) enables software-level identification of failed LED strings without external monitoring circuitry. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar LED driver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TLC5947 | 24-channel, 120mA/channel, SPI interface only; no analog dimming; no integrated fault reporting pin. | Lacks RFSH/FLT fault signaling and requires external fault monitoring; higher channel count but no phase shift or slew control. | Select when needing >16 channels and SPI-only control; avoid if I²C compatibility or integrated fault indication is required. |
| IS31FL3733 | 18-channel, 40mA/channel, I²C interface; includes auto-breathing and pattern RAM; no separate analog dimming register. | Lower max current limits use case to indicator-class LEDs; lacks configurable LED short threshold and refresh signal output. | Prefer for low-power UI indicators with animation features; not suitable for high-current backlighting or safety-critical fault reporting. |
Compared with TLC5947 and IS31FL3733, the MP3326AGRE-Z uniquely combines per-channel 12-bit PWM + 6-bit analog dimming, programmable EMI-reduction features (phase shift, slew rate), and direct fault signaling-making it optimal for high-reliability, high-current LED systems requiring both precision control and diagnostic transparency.
Availability
MP3326AGRE-Z is available at Aetrix Electronics and suitable for RGB backlighting, automotive instrument clusters, industrial HMI displays, and medical device indicators requiring stable component supply and long-term production continuity.
Supply support for MP3326AGRE-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 expertise in DC-DC converters, LED drivers, motor drivers, and battery management solutions.
The MP3326A belongs to MPS's high-channel-count LED driver product line, designed specifically for automotive-grade and industrial display applications demanding precise current matching, robust fault handling, and scalable digital control.
FAQ
What is the maximum number of MP3326AGRE-Z devices that can be cascaded on a single I²C bus?
Up to 10 MP3326AGRE-Z devices can be cascaded on one I²C bus using the ADDR pin resistor ratio to configure unique 4-bit LSB addresses (0x30–0x39). Each device requires its own ISET and ADDR resistors; SCL/SDA lines are shared, and RFSH/FLT pins must be wire-OR'd with external pull-up for fault aggregation.
How does the MP3326AGRE-Z handle LED string faults, and can fault behavior be customized?
The MP3326AGRE-Z detects LED open (≤150 mV for 4 ms) and short (≥3 V for 4 ms) conditions per channel, pulling RFSH/FLT low and setting corresponding bits in FAU_OP1/2 and FAU_SH1/2 registers. Fault response is configurable via the LATCH bit: latch-off mode holds shutdown until power cycle, while hiccup mode retries every 1 ms for automatic recovery.
What is the purpose of the RFSH/FLT pin beyond fault indication?
When FLTEN = 0, the RFSH/FLT pin outputs a programmable refresh signal (fREFRESH = 127500/(FRFSH × fPWM)) synchronized to the internal PWM clock. This signal can directly drive LCD panel refresh timing circuits, eliminating need for external oscillators or MCU-generated sync pulses in display subsystems.
Can analog and PWM dimming be used simultaneously on the same channel?
Yes-each channel supports concurrent analog dimming (via ICHx[5:0] register) and PWM dimming (via PWMx[11:0] register). Analog dimming scales the peak current amplitude (e.g., 0–80mA), while PWM dimming modulates duty cycle at fixed amplitude. Combined use enables ultra-low-light operation with minimal PWM artifacts.
What thermal derating guidance applies to the QFN-24 package at elevated ambient temperatures?
With θJA = 42°C/W on a 4-layer JEDEC board, the MP3326AGRE-Z dissipates up to 2.97W at TA = 25°C. At TA = 85°C, maximum continuous power drops to ~1.4W. Derating requires reducing total channel current or increasing copper area under the exposed thermal pad; thermal shutdown triggers at TJ = 170°C with 20°C hysteresis.
Is the MP3326AGRE-Z compliant with automotive AEC-Q100 qualification?
No-the MP3326AGRE-Z is not AEC-Q100 qualified. It is rated for –40°C to +125°C operating junction temperature and meets RoHS/lead-free/halogen-free requirements, but lacks automotive-specific stress testing (e.g., HTOL, TC, ESD). For automotive applications, verify system-level qualification per OEM requirements and consider thermal/fault margin rigorously.
How is LED current accuracy affected by temperature and supply voltage variations?
LED current accuracy is maintained within ±3% over –40°C to +125°C and 4.5–16V VIN due to the internal 1.2V ISET reference and matched current mirror architecture. VISET remains stable (1.176–1.224V), and current sink headroom (200–400mV) ensures regulation integrity even with LED VF drift across temperature.
MP3326AGRE-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:
- 1
- Voltage - Supply (Min):
- 4.5V
- Voltage - Supply (Max):
- 16V
- Voltage - Output:
- -
- Current - Output / Channel:
- 80mA
- Frequency:
- 220Hz, 250Hz, 280Hz, 330Hz
- 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)
MP3326AGRE-Z FAQ
1.How can I place an order for MP3326AGRE-Z through Aetrix?
Please submit a Request for Quotation (RFQ) for MP3326AGRE-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 MP3326AGRE-Z reliable?
The price and inventory of MP3326AGRE-Z are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MP3326AGRE-Z is usually 5 days.
3.What payment methods are accepted for MP3326AGRE-Z?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MP3326AGRE-Z transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MP3326AGRE-Z?
MP3326AGRE-Z orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MP3326AGRE-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 MP3326AGRE-Z?
For technical support, including MP3326AGRE-Z datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MP3326AGRE-Z requirements.
6.How does Aetrix verify that MP3326AGRE-Z is sourced from the original manufacturer or authorized distributors?
All MP3326AGRE-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 MP3326AGRE-Z meets industry standards.
7.What is the process for return or replacement of MP3326AGRE-Z?
All MP3326AGRE-Z units undergo pre-shipment inspection (PSI). If there is an issue with MP3326AGRE-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 MP3326AGRE-Z part is unused and in its original packaging.
Return procedure for MP3326AGRE-Z:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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