My Inquiry
My Account
Analog Devices Inc./Maxim Integrated MAX20446BATG/V+
- Part No.:
- MAX20446BATG/V+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- LED Drivers
- Package:
- 24-WFQFN Exposed Pad
- Datasheet:
-
MAX20446BATG/V+.pdf
- Description:
- IC LED DRV CTRL PWM 120MA 24TQFN
- Quantity:
- Payment:
- Shipping:
Inventory:7,427
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
The MAX20446BATG/V+ from Maxim Integrated is an automotive-grade 6-channel LED backlight driver with integrated boost/SEPIC controller, I²C interface, and hybrid dimming capability. It delivers up to 130mA per channel, operates from 4.5V to 36V input, withstands 52V load-dump events, and functions across –40°C to +125°C for instrument clusters and infotainment displays.
For engineers reviewing the MAX20446BATG/V+ datasheet, MAX20446BATG/V+ pinout, MAX20446BATG/V+ application, or MAX20446BATG/V+ equivalent, key selection considerations include its 400kHz–2.2MHz programmable switching frequency, 500ns minimum PWM pulse width, >10,000:1 hybrid dimming ratio, integrated diagnostics (LED open/short, thermal shutdown, BSTMON monitoring), and 24-pin TQFN package with 4mm × 4mm footprint.
Technical Context
The MAX20446BATG/V+ implements a current-mode DC-DC controller supporting both boost and SEPIC topologies, with adaptive output-voltage control to minimize power loss in LED sink paths. Its spread-spectrum oscillator and phase-shifted dimming reduce EMI without external filtering.
It integrates an 8-bit DAC for precise LED current setting, a 5V LDO (VCC) regulator, and a full diagnostic subsystem accessible via I²C-including real-time measurement of individual string currents, BSTMON voltage, thermal status, and fault flags (LED open/short, overvoltage, undervoltage).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 4.5V to 36V - supports full automotive battery range including cold-crank (≥4.2V post-startup) and load-dump survival up to 52V. |
| LED Channel Current | Up to 130mA per channel - enables driving high-brightness LED strings for automotive displays with tight channel matching (±2% at 120mA). |
| Switching Frequency | 400kHz to 2.2MHz - programmable via RT resistor; allows optimization of efficiency vs. EMI and enables use of small external magnetics. |
| Dimming Ratio | >10,000:1 hybrid dimming - achieves deep dimming without color shift by combining analog current scaling and PWM, critical for ambient-light-adaptive dashboards. |
| Operating Temperature | –40°C to +125°C - qualified for under-hood and display-module mounting locations per AEC-Q100 Grade 0 requirements. |
| I²C Interface | Standard-mode (400kHz) - enables full configuration, real-time monitoring, and fault reporting without additional GPIO or analog lines. |
| Package | 24-pin TQFN (4mm × 4mm, 0.5mm pitch) - compact footprint with low thermal resistance (θJA = 36°C/W on 4-layer board) for thermally constrained display assemblies. |
Pinout & Package
The MAX20446BATG/V+ is housed in a 24-pin, 4mm × 4mm TQFN package with exposed thermal pad (package code T2444+4C). Pin 1 is located at the top-left corner (marked by dot), and pins are numbered counterclockwise.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| IN | Bias supply input | Accepts 4.5V–36V main input; requires local 2.2µF ceramic bypass to GND for stability during load transients. |
| PGATE | External pMOSFET gate driver | Drives series disconnect MOSFET for fail-safe boost shutdown; supports fast turn-off during overvoltage or thermal fault. |
| OUT1–OUT6 | LED string cathode sinks | Open-drain linear current sinks; each delivers up to 130mA with internal current-setting reference (IREF) and channel disable capability. |
| FSEN | Fault sense input | Monitors external FET drain voltage to detect open-load conditions and enable fail-safe operation mode when configured. |
| RT | Oscillator timing node | Connects to GND via resistor (e.g., 76.8kΩ) to set fSW; also accepts external sync clock for deterministic EMI reduction. |
| IREF | Current reference input | Accepts 49.9kΩ-to-GND resistor to generate 1.25V reference; sets full-scale LED current via internal DAC scaling. |
| DIM | External PWM dimming input | Accepts 500ns-minimum PWM signal; used for standalone dimming or disabled (tied to GND) when I²C dimming is active. |
| SCL/SDA | I²C interface signals | Standard bidirectional I²C bus (400kHz max); requires external pullups to VCC for communication and register access. |
| FLTB | Open-drain fault flag output | Asserts low on unmasked faults (LED open/short, thermal warning, BSTMON OV/UV); requires external pullup to VCC. |
| GND / LEDGND / PGND | Ground terminals | Separate but co-located ground returns: GND (analog), LEDGND (current-sink return), PGND (power-switch return); must be joined at single point. |
Key Features
| Feature | Design Value |
|---|---|
| Hybrid dimming architecture | Combines analog current scaling and digital PWM to achieve >10,000:1 dimming ratio while maintaining consistent LED forward voltage and color point. |
| Adaptive output-voltage control | Dynamically adjusts boost output to just above the highest LED string forward voltage, minimizing power dissipation in current-sink paths and improving system efficiency. |
| Integrated diagnostics via I²C | Provides real-time readback of individual string currents, BSTMON voltage, thermal status, and fault flags-enabling predictive maintenance and ASIL-B-compliant error handling. |
| Spread-spectrum + phase-shift dimming | Reduces peak EMI by ±3% frequency dithering and staggered PWM timing across channels, easing EMC compliance without added shielding or filters. |
| Fail-safe FSEN-based operation | Uses external FET drain sensing to detect open LED strings and automatically enter safe state (e.g., reduce brightness or shut down) without relying solely on internal comparators. |
Applications
| Infotainment Displays | Central Information Displays |
|---|---|
Use Scenario: High-resolution TFT-LCD or OLED center-stack display requiring uniform brightness, wide dimming range, and robust fault reporting in vehicle cabin environments. IC Role / Device Role / Timing Role: Primary backlight driver managing six independent LED strings with I²C-configurable current, dimming profile, and diagnostics. Use Value: Enables seamless ambient-light-adaptive dimming (0.01%–100%) and real-time LED health monitoring to prevent partial screen blackout during operation. | Use Scenario: Driver-facing central display integrating navigation, media, and vehicle settings, mounted near HVAC vents with wide temperature excursions. IC Role / Device Role / Timing Role: Automotive-qualified LED driver delivering stable current across –40°C to +125°C, with thermal warning and shutdown protection. Use Value: Ensures uninterrupted display visibility during extreme thermal cycling and prevents thermal runaway via accurate junction temperature tracking and hysteresis-controlled shutdown. |
| Instrument Clusters | Head-Up Displays (HUD) |
Use Scenario: Safety-critical analog/digital gauge cluster where LED failure must be detected within milliseconds to trigger redundancy or warning indicators. IC Role / Device Role / Timing Role: Fault-aware backlight controller performing per-string open/short detection and reporting via I²C within <10µs latency. Use Value: Meets ASIL-B functional safety requirements through hardware-level fault detection (no software dependency) and fail-safe response using FSEN and FLTB signals. | Use Scenario: Compact HUD projection module requiring minimal board area, low EMI, and precise luminance control for optical waveguide illumination. IC Role / Device Role / Timing Role: Space-constrained 6-channel driver with 4mm × 4mm TQFN package, spread-spectrum switching, and phase-shifted dimming. Use Value: Reduces conducted and radiated emissions below CISPR-25 Class 5 limits without ferrite beads or shielded inductors, simplifying mechanical integration. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar 6-channel automotive LED driver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX20446AATG/V+ | Predecessor variant with identical pinout and package; lacks enhanced thermal warning threshold (125°C vs. 135°C in 'B') and tighter current matching (±2.5% vs. ±2% at 120mA). | Valid for legacy designs where thermal margin is less constrained and diagnostic resolution is acceptable at older spec levels. | Select MAX20446BATG/V+ for new designs requiring improved thermal monitoring accuracy and tighter channel matching per AEC-Q100 stress testing. |
| TPS61196RGER | TI 6-channel boost LED driver with 1.5A total output; uses analog dimming only (no hybrid/PWM), fixed 2.2MHz fSW, no I²C, and smaller 16-pin WQFN package. | Suitable for cost-sensitive non-safety-critical displays where diagnostics and flexible dimming are secondary to size and BOM count. | Choose MAX20446BATG/V+ when I²C configurability, >10,000:1 dimming, and comprehensive fault reporting are required for ASIL-compliant systems. |
Compared with MAX20446AATG/V+, the MAX20446BATG/V+ offers tighter current matching and earlier thermal warning; versus TPS61196RGER, it provides I²C control, hybrid dimming, and full diagnostics-making it the preferred choice for high-integrity automotive display systems demanding configurability and functional safety support.
Availability
The MAX20446BATG/V+ is available at Aetrix Electronics and suitable for infotainment displays, instrument clusters, and central information displays requiring stable component supply, AEC-Q100 qualification, and long-term automotive lifecycle support.
Supply support for MAX20446BATG/V+ 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
Maxim Integrated (now part of Analog Devices) designs precision analog, mixed-signal, and power-management ICs for automotive, industrial, and communications applications.
The MAX20446B product line targets automotive display backlighting, delivering high-channel-count, fault-aware LED drivers with integrated DC-DC conversion and digital control for next-generation digital cockpits.
FAQ
What is the maximum LED current per channel supported by the MAX20446BATG/V+?
The MAX20446BATG/V+ supports up to 130mA per channel in continuous operation. Electrical characteristics specify 120mA, 100mA, and 50mA factory-tested current settings with guaranteed accuracy (e.g., 116–124.5mA at 120mA setting), and channel-to-channel matching of ±2% at 120mA. The device's thermal design and package allow safe operation at the full 130mA rating under typical automotive thermal conditions.
Does the MAX20446BATG/V+ support both boost and SEPIC topologies?
Yes, the MAX20446BATG/V+ integrates a current-mode DC-DC controller configurable for either boost or SEPIC topology. The selection is determined by external component layout-not internal configuration-and both modes operate across the full 400kHz–2.2MHz switching frequency range. SEPIC is particularly useful when input voltage may exceed output voltage (e.g., start-stop battery transients), while boost is optimal for standard backlight step-up applications.
How does the hybrid dimming function work in the MAX20446BATG/V+?
The MAX20446BATG/V+ hybrid dimming combines analog current scaling (via internal 8-bit DAC) with digital PWM to achieve >10,000:1 dimming ratio. At high brightness, dimming is primarily analog; as brightness decreases, PWM duty cycle reduces while analog current remains near full scale-preserving LED color consistency and eliminating low-current instability. Minimum PWM pulse width is 500ns, enabling fine-grained control even at 200Hz frame rates.
What fault protections are implemented in the MAX20446BATG/V+?
The MAX20446BATG/V+ provides comprehensive hardware-based fault protection: LED open/short detection per string, boost output overvoltage/undervoltage (via BSTMON), thermal warning (125°C) and shutdown (165°C with 15°C hysteresis), and short-to-ground detection on OUT_ pins. All faults are reported via dedicated FLTB pin and readable through I²C registers, enabling both immediate fail-safe action and diagnostic logging for system-level analysis.
Is the MAX20446BATG/V+ AEC-Q100 qualified?
Yes, the MAX20446BATG/V+ is qualified per AEC-Q100 Grade 0 (–40°C to +150°C junction temperature), with full characterization across –40°C to +125°C ambient operating range. It meets automotive reliability requirements including HTOL, TC, UHAST, and ESD (HBM ±2kV, MM ±200V), and incorporates design features such as 52V load-dump tolerance and fail-safe FSEN-based open-LED detection for functional safety compliance.
MAX20446BATG/V+ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 24-WFQFN Exposed Pad
- Packaging:
- Tube
- Product Status:
- Active
- Type:
- DC DC Controller
- Topology:
- Step-Up (Boost), SEPIC
- Internal Switch(s):
- Yes
- Number of Outputs:
- 6
- Voltage - Supply (Min):
- 4.5V
- Voltage - Supply (Max):
- 36V
- Voltage - Output:
- 52V
- Current - Output / Channel:
- 120mA
- Frequency:
- 400kHz ~ 2.2MHz
- Dimming:
- Analog, I2C, PWM
- Applications:
- Backlight, Central Information Displays, Infotainment Displays, Instrument Clusters
- Operating Temperature:
- -40°C ~ 125°C (TA)
- Grade:
- Automotive
- Qualification:
- AEC-Q100
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 24-TQFN (4x4)
MAX20446BATG/V+ FAQ
1.How can I place an order for MAX20446BATG/V+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX20446BATG/V+ 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 MAX20446BATG/V+ reliable?
The price and inventory of MAX20446BATG/V+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX20446BATG/V+ is usually 5 days.
3.What payment methods are accepted for MAX20446BATG/V+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX20446BATG/V+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX20446BATG/V+?
MAX20446BATG/V+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX20446BATG/V+ 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 MAX20446BATG/V+?
For technical support, including MAX20446BATG/V+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX20446BATG/V+ requirements.
6.How does Aetrix verify that MAX20446BATG/V+ is sourced from the original manufacturer or authorized distributors?
All MAX20446BATG/V+ 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 MAX20446BATG/V+ meets industry standards.
7.What is the process for return or replacement of MAX20446BATG/V+?
All MAX20446BATG/V+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX20446BATG/V+, 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 MAX20446BATG/V+ part is unused and in its original packaging.
Return procedure for MAX20446BATG/V+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
MAX20446BATG/V+ Tags
-
BCR402RE6327HTSA1
Infineon Technologies
-
BCR430UXTSA2
Infineon Technologies
-
BCR420UE6433HTMA1
Infineon Technologies
-
BCR420UE6327HTSA1
Infineon Technologies
-
BCR421UE6327HTSA1
Infineon Technologies
-
LYT1604D-TL
Power Integrations
-
HV9910CLG-G
Microchip Technology
-
CL2N8-G
Microchip Technology
-
BCR420UW6-7
Diodes Incorporated
-
BCR421UW6-7
Diodes Incorporated
-
BCR420UFD-7
Diodes Incorporated
-
BCR421UFD-7
Diodes Incorporated
Tech Hub
A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.
The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…
The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…
A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…
A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …
An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…
Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…
An engineering guide to LED driver operation, constant-current and constant-voltage outputs, linear and switching topologies, dimming, IC selection, calculations, replacement compatibility, and fault c…
Operational amplifier guide covering op amp basics, feedback, ideal vs real op amps, common configurations, buffer circuits, offset, bias current, gain-bandwidth, slew rate, rail-to-rail limits and sel…
Jumper cables guide covering safe connection order, red and black clamp placement, final ground connection, cable gauge, length, clamp quality, copper vs CCA cables, jump starter comparison and battery…
