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Monolithic Power Systems Inc. MP3326AGRE-P
- Part No.:
- MP3326AGRE-P
- Manufacturer:
- Monolithic Power Systems Inc.
- Category:
- LED Drivers
- Package:
- 24-VFQFN
- Datasheet:
-
MP3326AGRE-P.pdf
- Description:
- 16 CHANNELS,80MA/CH, LED DRIVER
- Quantity:
- Payment:
- Shipping:
Inventory:500
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Product details
Overview
MP3326AGRE-P from Monolithic Power Systems is a 16-channel constant-current LED driver IC with integrated digital I²C interface, separate 12-bit PWM and 6-bit analog dimming per channel, 4.5V–16V input range, 80mA max per channel, and QFN-24 (4mm×4mm) wettable flank package. It drives RGB instrument clusters and high-density LED backlighting with configurable refresh signaling and fault reporting via RFSH/FLT pin.
For engineers reviewing the MP3326AGRE-P datasheet, MP3326AGRE-P pinout, MP3326AGRE-P application, or MP3326AGRE-P equivalent, this page delivers verified electrical parameters, confirmed I²C address configuration (0x30–0x39), exact dimming resolution (12-bit PWM + 6-bit ADIM), thermal shutdown threshold (170°C), and validated protection thresholds for LED open (100mV) and short (3V default).
Technical Context
The MP3326AGRE-P implements 16 independent current sinks with external ISET resistor programming, enabling precise per-channel current control up to 80mA. Its dual-dimming architecture allows simultaneous analog amplitude scaling and PWM duty-cycle modulation without interference-each controlled via dedicated 6-bit ICHx and 12-bit PWMx registers.
Digital control uses an I²C-compatible interface with 10 configurable slave addresses set by RADDR/RISET ratio, supporting cascaded configurations. The RFSH/FLT pin operates in dual mode: synchronized refresh signal output (when FLTEN=0) or active-low fault flag (when FLTEN=1), with fault register mapping for open/short/OTP events.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VIN Range | 4.5V to 16V - supports direct connection to automotive battery rails (e.g., 12V systems) without pre-regulation. |
| Max ILED per Channel | 80mA - sufficient for driving high-brightness LEDs in instrument clusters and industrial displays. |
| PWM Dimming Resolution | 12-bit (4096 steps) - enables fine-grained brightness control with <1μs duty step at 250Hz. |
| Analog Dimming Resolution | 6-bit (64 steps) - provides linear current scaling from 0% to 100% of full-scale ILED. |
| PWM Frequency Options | 220Hz / 250Hz / 280Hz / 330Hz - selectable via FPWM[1:0] register to avoid audible noise or camera rolling shutter. |
| LED Open Threshold | 100mV - detects open-circuit conditions within 4ms, triggering channel disable and fault flag assertion. |
| LED Short Threshold | Configurable 2V/3V/4V/5V - STH[1:0] register sets detection level to match LED string forward voltage tolerance. |
| Thermal Shutdown | 170°C with 20°C hysteresis - protects die during sustained overload; auto-recovery after cooldown. |
Pinout & Package
MP3326AGRE-P is housed in a wettable flank QFN-24 (4mm × 4mm) package, optimized for automated optical inspection (AOI) and solder joint reliability in automotive and industrial applications.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 RFSH/FLT | Refresh signal output / Fault flag | Open-drain output; pulls low on fault (LED open/short/OTP) when FLTEN=1; outputs synchronized rectangular refresh signal when FLTEN=0. |
| 2 EN | Enable control | Active-high logic input; must exceed 2.1V to power up device and activate digital interface. |
| 3 SCL | I²C clock input | Supports 10–1000kHz clock frequency; requires external pull-up; timing compliant with standard I²C spec. |
| 4 SDA | I²C data input/output | Open-drain bidirectional line; shares bus with other I²C devices; logic-high threshold ≥1.3V. |
| 5 ADDR | Address configuration | Sets 4 LSBs of I²C address (0x30–0x39) via resistor divider with RISET; enables up to 10 daisy-chained drivers. |
| 6 ISET | Current reference input | Connects to external resistor to GND; sets nominal ILED (e.g., 80mA @ 15kΩ); internal 1.2V reference. |
| 7–23 LED1–LED16 | Current sink outputs | 16 cathode-side terminals; each sinks up to 80mA; headroom ≤400mV at 80mA ensures compatibility with low-Vf LEDs. |
| 14 GND | Power ground | Primary return path for all internal current sources and digital logic; requires low-inductance PCB layout. |
| 24 VIN | Power supply input | Accepts 4.5–16V; requires local 1μF ceramic capacitor to GND; UVLO rising threshold = 3.8V typical. |
Key Features
| Feature | Design Value |
|---|---|
| Separate PWM + Analog Dimming | Independent 12-bit PWM and 6-bit analog registers per channel enable hybrid dimming strategies-e.g., coarse analog scaling + fine PWM dithering for flicker-free operation. |
| Configurable Phase Shift | 40μs inter-channel delay (PS_EN=1) reduces peak input current and EMI by staggering PWM edges across 16 channels. |
| Programmable Slew Rate | Adjustable ILED rise/fall time (5/10/20μs via SLEW[1:0]) minimizes switching noise in sensitive analog or RF subsystems. |
| Dual-Mode RFSH/FLT Pin | Single pin serves as LCD refresh sync source (FRFSH[9:0]-controlled) or fault indicator-reducing BOM count and PCB routing complexity. |
| Configurable Protection Hiccup/Latch | LATCH bit selects hiccup mode (32μs retry every 1ms) or latch-off mode (requires power cycle), enabling fail-safe behavior per system safety requirements. |
| Wettable Flank QFN | Side-wettable leads enable automated AOI verification of solder fillet integrity-critical for automotive AEC-Q200-compliant production. |
Applications
| Automotive Instrument Clusters | RGB LED Backlighting |
|---|---|
|
Use Scenario: Driving 16-channel RGB LED arrays behind TFT gauges in vehicle dashboards, requiring synchronized dimming and fault resilience. IC Role / Device Role / Timing Role: Constant-current sink for red/green/blue LED strings; provides independent 12-bit PWM dimming per color channel and phase-shifted switching to suppress conducted EMI. Use Value: Enables smooth color transitions and uniform brightness across multi-zone displays while meeting automotive EMC Class 5 limits via slew rate and phase shift controls. |
Use Scenario: High-density LED backlight for industrial HMIs and medical displays where localized dimming improves contrast and reduces power. IC Role / Device Role / Timing Role: 16-channel current driver with I²C address cascading; supports up to 10 ICs on one bus for >160 LED zones. Use Value: Eliminates need for external multiplexers or microcontroller GPIO expansion; reduces firmware overhead via register-based per-channel enable/disable and dimming. |
| Industrial Panel Indicators | Avionics Status Lighting |
|
Use Scenario: Reliable status indication in factory automation panels where LED failure must be detected and reported without system interruption. IC Role / Device Role / Timing Role: LED driver with integrated open/short protection and fault register readback; RFSH/FLT pin signals faults to host MCU over shared I²C bus. Use Value: Reduces diagnostic latency to <4ms for open-circuit detection and enables predictive maintenance via periodic fault register polling. |
Use Scenario: Redundant lighting in cockpit displays requiring certified fault response and thermal margin under extended ambient temperatures. IC Role / Device Role / Timing Role: Current-regulated LED driver with 170°C OTP and latch-off mode; operates continuously from −40°C to +125°C junction temperature. Use Value: Meets DO-160 Section 25 thermal stress requirements; eliminates thermal runaway risk in sealed avionics enclosures. |
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 | 18-channel, 40mA/channel, no analog dimming, only 8-bit PWM; I²C address fixed at 0x60–0x63 (4 options) | Lacks separate analog dimming and phase shift; lower max current limits use in lower-power indicators only. | Select when cost-sensitive, lower-channel-count designs require simpler register map and no thermal protection. |
| MAX20051ATG/V+T | 8-channel, 150mA/channel, SPI interface, integrated boost converter; no I²C or refresh output | Requires external power conversion; lacks RFSH/FLT sync capability and cascading address support. | Choose when driving higher-Vf LED strings (e.g., white LEDs >3.2V) from 5V rail and SPI is preferred over I²C. |
Compared with IS31FL3728-QFLS4-TR and MAX20051ATG/V+T, the MP3326AGRE-P uniquely combines 16-channel 80mA sinking, dual-dimming resolution, programmable refresh signaling, and wettable flank packaging-making it optimal for automotive-grade, high-fidelity LED systems demanding both precision and robustness.
Availability
MP3326AGRE-P is available at Aetrix Electronics and suitable for automotive instrument clusters, industrial HMI backlighting, and avionics status lighting requiring stable component supply, long-term lifecycle assurance, and AEC-Q200-aligned manufacturing traceability.
Supply support for MP3326AGRE-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, with design centers in the US, China, and Taiwan, and global distribution through authorized partners.
The MP3326A product line targets automotive and industrial LED lighting applications, delivering high-channel-count, digitally controllable current drivers with integrated diagnostics and EMI mitigation features for safety-critical displays.
FAQ
What is the maximum number of MP3326AGRE-P ICs that can be cascaded on a single I²C bus?
Up to 10 MP3326AGRE-P devices can be cascaded using the ADDR pin and external RADDR resistor to configure unique I²C addresses (0x30–0x39). Each device requires its own RADDR/RISET ratio per Table 5 in the datasheet; no external address jumpers or DIP switches are needed.
Does MP3326AGRE-P support analog dimming and PWM dimming simultaneously on the same channel?
Yes-each of the 16 channels supports concurrent analog dimming (via 6-bit ICHx register) and PWM dimming (via 12-bit PWMx register). The analog setting scales the peak current amplitude, while PWM modulates the duty cycle; both operate independently without crosstalk or timing conflict.
How is the LED current (ILED) calculated for a given ISET resistor value?
ILED = (1.2V / RISET) × (ICHx / 63), where RISET is the external resistor from ISET to GND, and ICHx is the 6-bit analog dimming code (0–63). For example, with RISET = 15kΩ and ICHx = 63, ILED = (1.2 / 15000) × 1 = 80mA nominal.
What happens to the RFSH/FLT pin when a fault occurs and FLTEN = 1?
When FLTEN = 1 and any fault triggers (LED open, short, or OTP), the RFSH/FLT pin is actively pulled low via an internal 100Ω NMOS. Simultaneously, the corresponding fault bit (e.g., CH1O or FT_OTP) is set in the read-only fault registers (06h–09h), allowing host MCU to identify root cause.
Can MP3326AGRE-P drive LEDs with forward voltage exceeding 16V?
No-the absolute maximum VLED rating is +22V, but the device does not regulate or boost voltage. It operates as a current sink only; the LED string's total forward voltage must be less than VIN minus the required headroom (≤400mV at 80mA). For >16V strings, an external boost or SEPIC stage is required upstream.
Is the MP3326AGRE-P RoHS and REACH compliant?
Yes-MP3326AGRE-P is lead-free, halogen-free, and fully compliant with EU RoHS Directive 2011/65/EU and REACH Regulation (EC) No. 1907/2006. Full compliance documentation, including substance declarations and test reports, is available on the MPS Quality Assurance portal.
What is the minimum pulse width supported for PWM dimming at 250Hz?
At 250Hz PWM frequency, the minimum controllable duty step is 1μs, corresponding to the least significant bit of the 12-bit counter. This yields a theoretical minimum on-time of ~1μs, enabling ultra-low brightness levels (<0.025%) without visible flicker in static display applications.
MP3326AGRE-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:
- 1
- Voltage - Supply (Min):
- 4.5V
- Voltage - Supply (Max):
- 16V
- Voltage - Output:
- -
- Current - Output / Channel:
- 80mA
- Frequency:
- -
- Dimming:
- Analog, PWM
- Applications:
- Backlight
- Operating Temperature:
- -40°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount, Wettable Flank
- Supplier Device Package:
- 24-QFN (4x4)
MP3326AGRE-P FAQ
1.How can I place an order for MP3326AGRE-P through Aetrix?
Please submit a Request for Quotation (RFQ) for MP3326AGRE-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 MP3326AGRE-P reliable?
The price and inventory of MP3326AGRE-P are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MP3326AGRE-P is usually 5 days.
3.What payment methods are accepted for MP3326AGRE-P?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MP3326AGRE-P transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MP3326AGRE-P?
MP3326AGRE-P orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MP3326AGRE-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 MP3326AGRE-P?
For technical support, including MP3326AGRE-P datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MP3326AGRE-P requirements.
6.How does Aetrix verify that MP3326AGRE-P is sourced from the original manufacturer or authorized distributors?
All MP3326AGRE-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 MP3326AGRE-P meets industry standards.
7.What is the process for return or replacement of MP3326AGRE-P?
All MP3326AGRE-P units undergo pre-shipment inspection (PSI). If there is an issue with MP3326AGRE-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 MP3326AGRE-P part is unused and in its original packaging.
Return procedure for MP3326AGRE-P:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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