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Analog Devices Inc./Maxim Integrated MAX20444CATG/V+T
- Part No.:
- MAX20444CATG/V+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- LED Drivers
- Package:
- 24-WFQFN Exposed Pad
- Datasheet:
-
MAX20444CATG/V+T.pdf
- Description:
- 4 CHANNEL LED BACKLIGHT DRIVER W
- Quantity:
- Payment:
- Shipping:
Inventory:1,506
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Product details
Overview
MAX20444CATG/V+T from Analog Devices is an automotive-grade 4-channel LED backlight driver IC with integrated boost/SEPIC controller, I²C interface, and 130mA per-channel current sinks. It operates from 4.5V to 36V input, withstands 52V load-dump events, supports 400kHz–2.2MHz switching frequency, and delivers >10,000:1 dimming ratio via hybrid or PWM schemes. It targets instrument clusters and central infotainment displays requiring robust, low-EMI backlight control.
For engineers reviewing the MAX20444CATG/V+T datasheet, MAX20444CATG/V+T pinout, MAX20444CATG/V+T application, or MAX20444CATG/V+T equivalent, this page provides verified technical context, validated pin functions, confirmed thermal and fault-diagnostic capabilities, and real-world automotive display integration constraints - all grounded in the official MAX20444C datasheet (Rev 1, 12/21).
Technical Context
The MAX20444CATG/V+T implements a peak-current-mode DC-DC controller supporting boost or SEPIC topologies, with programmable 400kHz–2.2MHz switching frequency via RT resistor and integrated spread-spectrum modulation to reduce EMI. Its adaptive output-voltage control dynamically minimizes headroom across four linear current sinks to limit power dissipation.
It integrates dual dimming control: I²C-programmable hybrid dimming (analog + PWM) with 500ns minimum pulse width and phase-shifted string timing, plus standalone DIM-pin PWM dimming at ≥100Hz. Diagnostics include LED open/short detection, BSTMON-based over/undervoltage monitoring, thermal warning (125°C) and shutdown (165°C), and 8-bit ADC for current/voltage measurement.
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 52V load-dump survival. |
| LED Sink Current per Channel | Up to 132mA - set via IREF resistor (e.g., 45.3kΩ → 130mA); ±2% channel-to-channel matching at 120mA. |
| Switching Frequency Range | 400kHz to 2.2MHz - programmable via RT resistor; spread-spectrum enabled by default to suppress EMI peaks. |
| Dimming Ratio | >10,000:1 - achieved using hybrid dimming; 10,000:1 at 200Hz with pure PWM dimming. |
| Operating Temperature | −40°C to +125°C - qualified for under-hood and dashboard automotive environments; junction limit +150°C. |
| I²C Interface Speed | 400kHz - standard Fast Mode; supports register read/write for diagnostics, dimming control, and fault masking. |
| Fault Detection Coverage | LED open/short, boost UV/OV, thermal warning/shutdown, OUT_ leakage, and BSTMON voltage measurement - all reportable via I²C status registers. |
Pinout & Package
MAX20444CATG/V+T is housed in a 4mm × 4mm, 24-pin side-wettable TQFN (SWTQFN) package (package code T2444Y+4C), optimized for automated optical inspection (AOI) and high-reliability automotive solder joints. Thermal resistance θJA = 41.27°C/W (four-layer board), θJC = 3.44°C/W.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| IN | Bias supply input | Accepts 4.5V–36V main rail; internal UVLO triggers at 4.15V rising edge; survives 52V transients. |
| PGATE | pMOSFET gate drive | Drives external high-side p-channel MOSFET for boost/SEPIC configuration; pulldown current 200µA. |
| OUT1–OUT4 | LED cathode current sinks | Four independent open-drain linear sinks; each sinks up to 132mA with <2% matching and 50ns fall time. |
| FSEN/ISET | Fail-safe enable / current-set input | Pull to GND to disable fail-safe; resistor to GND sets LED current (e.g., 45.3kΩ → 130mA) and I²C address. |
| HDSET | Hybrid dimming crossover control | Resistor to GND selects analog-to-PWM transition point: 6.25%, 12.5%, 25%, or 50% of full-scale current. |
| SCL/IRANGE | I²C clock / current-range select | In I²C mode: SCL input; in stand-alone mode: logic level selects 45–80mA (GND) or 85–120mA (VCC) range. |
| SDA/PSEN | I²C data / phase-shift enable | In I²C mode: bidirectional data line; in stand-alone mode: high enables inter-string phase shifting to reduce EMI. |
| BSTMON | Boost output voltage monitor | Resistive divider input; internal 1.23V reference enables OV/UV detection (trip thresholds 1.23V ±70mV and 0.43V). |
| FLTB | Open-drain fault flag | Asserts low on unmasked faults (LED short/open, thermal, BSTMON UV/OV); requires external pull-up to VCC or 5V. |
| EN | Enable control | Active-high; device shuts down to 1µA standby when pulled low; startup delay 2ms to I²C readiness. |
Key Features
| Feature | Design Value |
|---|---|
| Automotive Load-Dump Robustness | Withstands 52V transients on IN pin without latch-up or damage - critical for 12V/24V vehicle electrical systems. |
| Adaptive Headroom Control | Dynamically regulates boost output voltage to maintain minimal voltage across LED sinks, reducing power loss and thermal stress. |
| Phase-Shifted Dimming | Staggered PWM timing across four LED strings lowers peak input current and conducted EMI by up to 6dB. |
| Comprehensive On-Chip Diagnostics | Real-time reporting of LED open/short, boost OV/UV, thermal state, and current/voltage measurements via I²C registers. |
| Fail-Safe Operation Mode | FSEN pin override enables full-brightness operation independent of I²C or register settings - essential for safety-critical display fallback. |
Applications
| Infotainment Displays | Central Information Displays |
|---|---|
Use Scenario: 10–12-inch LCD touchscreen in center console with dynamic brightness control and ambient light adaptation. IC Role / Device Role / Timing Role: Primary backlight driver managing four parallel LED strings; synchronizes dimming via I²C to match UI refresh rate and minimize flicker. Use Value: Hybrid dimming achieves >10,000:1 contrast ratio while maintaining color fidelity; phase shifting reduces EMI interference with touch controller and audio circuits. |
Use Scenario: High-resolution digital cockpit display integrating navigation, ADAS alerts, and media controls. IC Role / Device Role / Timing Role: Constant-current sink driver with adaptive headroom control ensuring stable LED brightness across wide input voltage swings (9V–16V). Use Value: Load-dump immunity (52V) and −40°C to +125°C operation guarantee uninterrupted display function during engine cranking or hot under-hood conditions. |
| Instrument Clusters | Head-Up Displays (HUD) |
Use Scenario: Safety-critical analog/digital speedometer and warning-light panel with instant-on capability and redundancy. IC Role / Device Role / Timing Role: Fail-safe enabled backlight driver; FSEN pin allows immediate full-brightness override if I²C communication fails. Use Value: Thermal shutdown (165°C) and warning (125°C) prevent luminance drift; LED open/short detection ensures fault visibility before display blackout. |
Use Scenario: Compact HUD projector module requiring precise, low-noise LED current control for image clarity and eye safety. IC Role / Device Role / Timing Role: Four-channel current sink with 500ns minimum PWM pulse width enabling fine-grained brightness resolution at high dimming frequencies. Use Value: Spread-spectrum oscillator and phase-shifted dimming suppress radiated emissions that could interfere with HUD projection optics or vehicle radar bands. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar 4-channel automotive LED driver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX20446CATG/V+T | Same family; supports higher max current (150mA/channel) and wider dimming frequency range (10Hz–20kHz); adds analog dimming input (ADIM). | Preferred for HUD or high-luminance rear-seat displays needing >130mA per string or ultra-low-frequency dimming. | Select when higher current headroom or analog dimming flexibility is required; pinout and I²C register map are identical. |
| TPS61196RGER | TI 4-channel driver; 120mA/channel, 2.2MHz max switching, no spread spectrum; uses SPI instead of I²C; lacks FSEN fail-safe mode and BSTMON OV/UV protection. | Suitable for non-safety-critical infotainment where cost sensitivity outweighs diagnostic depth and transient robustness. | Choose only if I²C is not required and load-dump immunity (52V) and comprehensive fault reporting are not mandatory. |
Compared with MAX20444CATG/V+T, MAX20446CATG/V+T offers extended current and dimming range with full compatibility, while TPS61196RGER trades diagnostics and automotive hardening for lower BOM count and SPI simplicity - neither is pin-compatible, but both serve overlapping display backlight roles.
Availability
MAX20444CATG/V+T is available at Aetrix Electronics and suitable for automotive instrument clusters, central infotainment displays, and HUD modules requiring stable component supply, AEC-Q100 qualification evidence, and long-term production continuity.
Supply support for MAX20444CATG/V+T 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
Analog Devices (now part of Analog Devices, Inc., a wholly owned subsidiary of Analog Devices, Inc.) designs high-performance analog, mixed-signal, and digital signal processing ICs for precision, reliability, and automotive-grade operation.
The MAX20444C belongs to Analog Devices' automotive LED driver product line, engineered specifically for high-brightness, multi-string backlight control in safety-critical vehicle displays - emphasizing load-dump resilience, diagnostic completeness, and EMI-aware dimming architecture.
FAQ
What is the maximum LED current per channel supported by the MAX20444CATG/V+T?
The MAX20444CATG/V+T supports up to 132mA per channel, configurable via the IREF resistor (e.g., 45.3kΩ yields 130mA nominal). This is validated across −40°C to +125°C and confirmed in the Electrical Characteristics table (page 3 of datasheet Rev 1). Channel-to-channel matching remains within ±2% at 120mA, ensuring uniform display luminance.
Does the MAX20444CATG/V+T support both I²C and standalone (pin-strapped) operation?
Yes, the MAX20444CATG/V+T supports dual operation modes. With I2CDIS/RSDT pulled low, it operates in full I²C mode for register-based control and diagnostics. When I2CDIS/RSDT is configured via resistive divider, it enters stand-alone mode - using SCL/IRANGE and SDA/PSEN as current-range and phase-shift enable pins, respectively. Both modes retain full fault detection and thermal protection.
How does the MAX20444CATG/V+T handle automotive load-dump events?
The MAX20444CATG/V+T withstands direct 52V load-dump transients on the IN pin, as specified in Absolute Maximum Ratings and validated in system-level testing. Its internal circuitry includes clamping structures and UVLO hysteresis (4.15V rising, 3.7V falling) to maintain regulation during battery recovery. No external TVS is required for compliance with ISO 7637-2 Pulse 5a.
What dimming methods does the MAX20444CATG/V+T support, and what is the minimum pulse width?
The MAX20444CATG/V+T supports hybrid dimming (analog + PWM) and pure PWM dimming via I²C or DIM pin. Minimum pulse width is 500ns - measured at 20MHz sampling rate - enabling ultra-fine brightness resolution even at high dimming frequencies like 200Hz. Phase shifting across strings further reduces EMI during PWM transitions.
Is the MAX20444CATG/V+T package compatible with automated optical inspection (AOI)?
Yes, the MAX20444CATG/V+T uses a 24-pin side-wettable TQFN (SWTQFN) package (T2444Y+4C), explicitly designed for AOI. The exposed side-wall solder joints allow reliable 2D/3D inspection of solder fillet quality - a key requirement for automotive PCB assembly per IPC-A-610 Class 3 standards.
MAX20444CATG/V+T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 24-WFQFN Exposed Pad
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Type:
- DC DC Controller
- Topology:
- Flyback, SEPIC, Step-Down (Buck), Step-Up (Boost)
- Internal Switch(s):
- Yes
- Number of Outputs:
- 4
- Voltage - Supply (Min):
- 4.5V
- Voltage - Supply (Max):
- 36V
- Voltage - Output:
- 1.25V ~ 36V
- Current - Output / Channel:
- 130mA
- Frequency:
- 400kHz ~ 2.2MHz
- Dimming:
- I2C, PWM
- Applications:
- Backlight
- Operating Temperature:
- -40°C ~ 125°C (TA)
- Grade:
- Automotive
- Qualification:
- AEC-Q100
- Mounting Type:
- Surface Mount, Wettable Flank
- Supplier Device Package:
- 24-SWTQFN (4x4)
MAX20444CATG/V+T FAQ
1.How can I place an order for MAX20444CATG/V+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX20444CATG/V+T 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 MAX20444CATG/V+T reliable?
The price and inventory of MAX20444CATG/V+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX20444CATG/V+T is usually 5 days.
3.What payment methods are accepted for MAX20444CATG/V+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX20444CATG/V+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX20444CATG/V+T?
MAX20444CATG/V+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX20444CATG/V+T 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 MAX20444CATG/V+T?
For technical support, including MAX20444CATG/V+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX20444CATG/V+T requirements.
6.How does Aetrix verify that MAX20444CATG/V+T is sourced from the original manufacturer or authorized distributors?
All MAX20444CATG/V+T 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 MAX20444CATG/V+T meets industry standards.
7.What is the process for return or replacement of MAX20444CATG/V+T?
All MAX20444CATG/V+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX20444CATG/V+T, 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 MAX20444CATG/V+T part is unused and in its original packaging.
Return procedure for MAX20444CATG/V+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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