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Analog Devices Inc./Maxim Integrated MAX20444BATG/VY+T
- Part No.:
- MAX20444BATG/VY+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- LED Drivers
- Package:
- 24-WFQFN Exposed Pad
- Datasheet:
-
MAX20444BATG/VY+T.pdf
- Description:
- IC LED DRIVER CTRLR PWM 24TQFN
- Quantity:
- Payment:
- Shipping:
Inventory:1,296
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Product details
Overview
MAX20444BATG/VY+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 - used in instrument clusters and infotainment displays.
For engineers reviewing the MAX20444BATG/VY+T datasheet, MAX20444BATG/VY+T pinout, MAX20444BATG/VY+T application, or MAX20444BATG/VY+T equivalent, key selection considerations include its AEC-Q100 qualification, -40°C to +125°C operation, side-wettable TQFN-24 package, fail-safe FSEN functionality, and integrated diagnostics including LED open/short detection and BSTMON voltage monitoring.
Technical Context
The MAX20444BATG/VY+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 spread-spectrum modulation for EMI reduction. Its adaptive output-voltage control dynamically adjusts headroom across four linear current sinks to minimize power dissipation.
It integrates dual dimming control: I²C-programmable hybrid dimming (analog + PWM) with 500ns minimum pulse width, plus external DIM-pin PWM dimming at up to 200Hz; phase-shifted dimming across channels further lowers EMI. Diagnostics are accessible via I²C register reads, including real-time LED current/voltage measurements, thermal warning (125°C), and shutdown (165°C).
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 after startup) and 52V load-dump survival |
| LED Current per Channel | Up to 132mA - set via IREF resistor (e.g., 45.3kΩ for 130mA); ±2% channel-to-channel matching at 120mA |
| Switching Frequency | 400kHz to 2.2MHz - adjustable via RT resistor; dither-enabled for EMI reduction |
| Dimming Ratio | >10,000:1 - achieved using hybrid dimming; 10,000:1 at 200Hz with PWM-only mode |
| Operating Temperature | -40°C to +125°C - qualified for automotive cabin and instrument cluster environments |
| I²C Interface | Standard-mode (400kHz) - supports register-based configuration, fault reporting, and ADC readback of LED current/voltage |
| Package | 24-pin SWTQFN (4mm × 4mm) - side-wettable leads enable automated optical inspection (AOI) for automotive PCB assembly |
Pinout & Package
MAX20444BATG/VY+T is housed in a 24-pin side-wettable TQFN (SWTQFN) package, outline number 21-100290, land pattern 90-0022, with exposed pad (EP) for thermal management. Pin pitch is 0.5mm; package code T2444Y+4C indicates RoHS-compliant, wettable flank construction.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| IN | Bias supply input | Accepts 4.5V–36V main rail; bypassed with 2.2µF ceramic capacitor to GND |
| PGATE | External pMOSFET gate drive | Controls high-side series MOSFET for boost/SEPIC output regulation |
| OUT1–OUT4 | LED string cathode sinks | Four open-drain current sinks (max 132mA each); connect LED anodes to boost output |
| FSEN/ISET | Fail-safe enable / current-set input | Pull to GND for I²C mode; resistor to GND sets LED current and I²C address (default 0x68) |
| HDSET | Hybrid dimming crossover point | Resistor to GND selects analog-to-PWM transition threshold: 6.25%, 12.5%, 25%, or 50% |
| SCL/IRANGE | I²C clock / current-range select | In I²C mode: SCL input; in stand-alone: GND = low range (45–80mA), VCC = high range (85–120mA) |
| SDA/PSEN | I²C data / phase-shift enable | In I²C mode: bidirectional data line; in stand-alone: high enables inter-string phase shifting for EMI reduction |
| BSTMON | Boost output voltage monitor | Resistive divider input for overvoltage (1.23V threshold) and undervoltage (0.43V threshold) protection |
| CS | Current-sense amplifier input | Connects to source of external nMOSFET; senses peak inductor current with slope compensation |
| COMP | Controller compensation node | Connect Type II/III network to GND for stable current-mode loop compensation |
| DIM | External PWM dimming input | 20MHz-sampled input; min pulse width 500ns; frequency locked on first two pulses after EN rise |
| FLTB | Open-drain fault flag output | Asserts low on unmasked faults: LED open/short, BSTMON UV/OV, thermal warning/shutdown, or current-sense error |
Key Features
| Feature | Design Value |
|---|---|
| Automotive AEC-Q100 Grade-1 qualification | Validated for -40°C to +125°C ambient operation with 150°C junction limit - suitable for under-hood and dashboard mounting |
| Integrated diagnostic ADC | 8-bit converter measures LED current (±6mA error at 120mA) and BSTMON voltage (±80mV error), enabling closed-loop system health monitoring |
| Fail-safe FSEN operation | Hardware override: pulling FSEN/ISET high enables boost and 100% LED current regardless of I²C state - critical for safety-critical display fallback |
| Phase-shifted dimming | Configurable inter-string timing offset reduces peak input current and conducted EMI by distributing switching harmonics across time domain |
| Adaptive headroom control | Real-time adjustment of boost output voltage to maintain minimal voltage drop across current sinks - cuts power loss by up to 30% vs fixed-headroom designs |
| Side-wettable TQFN package | SWTQFN-24 enables automated optical inspection of solder joints - required for zero-defect automotive manufacturing compliance |
Applications
| Infotainment Displays | Central Information Displays |
|---|---|
Use Scenario: High-brightness LCD backlight in center-stack multimedia units with dynamic content and variable ambient light. IC Role / Device Role / Timing Role: 4-channel constant-current sink driving parallel LED strings; synchronized dimming via I²C or DIM pin. Use Value: Hybrid dimming achieves flicker-free 10,000:1 contrast while minimizing thermal stress on LEDs during prolonged high-luminance operation. |
Use Scenario: Driver-facing digital cockpit display requiring seamless brightness transitions and functional safety compliance. IC Role / Device Role / Timing Role: Fail-safe backlight controller with FSEN-triggered 100% current override and real-time LED open/short detection. Use Value: Thermal shutdown (165°C) and diagnostic reporting via FLTB ensure uninterrupted display operation during thermal transients. |
| Instrument Clusters | Head-Up Displays (HUD) |
Use Scenario: Analog-style gauge rendering with segmented LED arrays requiring precise current matching and EMI control. IC Role / Device Role / Timing Role: Four matched current sinks (±2% at 120mA) with phase-shifted dimming to suppress switching noise coupling into analog sensors. Use Value: Spread-spectrum oscillator and phase shifting reduce radiated emissions below CISPR-25 Class 5 limits without added shielding. |
Use Scenario: Compact HUD projection module where space constraints demand high integration and thermal efficiency. IC Role / Device Role / Timing Role: Integrated boost/SEPIC controller + 4-channel sink eliminates need for discrete DC-DC and driver ICs. Use Value: Adaptive headroom control minimizes power dissipation in the current-sink path - critical for sealed, fanless HUD enclosures. |
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 |
|---|---|---|---|
| MAX20444ATG/VY+T | Same die, standard TQFN (non-side-wettable); θJA = 36°C/W vs 41.27°C/W for SWTQFN | Lacks AOI-compatible leads; not approved for new automotive designs requiring IPC-A-610 Class 3 visual inspection | Select only for legacy non-AOI production or cost-sensitive non-automotive applications. |
| LM3409QMY/NOPB | Single-channel automotive LED controller; requires external current sinks and I²C bridge for multi-string control | No integrated diagnostics, no hybrid dimming, no phase shifting - demands additional ICs for equivalent functionality | Choose only when scaling to <2 strings or when leveraging existing LM3409-based platform architecture. |
Compared with MAX20444ATG/VY+T, the MAX20444BATG/VY+T offers superior manufacturability for automotive OEMs via side-wettable leads, while versus LM3409QMY/NOPB it delivers higher integration, lower BOM count, and built-in functional safety diagnostics - reducing design validation effort and board area by ≥40%.
Availability
MAX20444BATG/VY+T is available at Aetrix Electronics and suitable for automotive instrument clusters, infotainment systems, and central information displays requiring stable component supply, AEC-Q100 compliance, and long-term lifecycle support.
Supply support for MAX20444BATG/VY+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 is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, serving automotive, industrial, and communications markets with precision power, sensing, and connectivity solutions.
The MAX20444B belongs to Analog Devices' automotive LED driver product line, engineered specifically for high-reliability, high-brightness display backlighting in harsh environments - emphasizing AEC-Q100 qualification, integrated diagnostics, and EMI-optimized switching architectures.
FAQ
What is the maximum LED current per channel supported by the MAX20444BATG/VY+T?
The MAX20444BATG/VY+T supports up to 132mA per channel, configurable via the IREF resistor (e.g., 45.3kΩ yields 130mA nominal). Channel-to-channel matching is ±2% at 120mA, and total leakage current across all OUT_ pins is ≤15µA at 48V. This rating holds across the full -40°C to +125°C operating temperature range.
Does the MAX20444BATG/VY+T support both I²C and stand-alone (pin-strapped) operation?
Yes, the MAX20444BATG/VY+T supports dual modes: I²C-controlled operation (with registers for dimming, diagnostics, and configuration) and stand-alone mode where SCL/IRANGE and SDA/PSEN pins configure current range and phase shifting at power-up. In stand-alone mode, the FSEN/ISET pin sets LED current via resistor, and DIM remains active for PWM control.
How does the MAX20444BATG/VY+T handle automotive load-dump conditions?
The MAX20444BATG/VY+T withstands direct 52V load-dump transients on the IN pin, verified per ISO 7637-2 Pulse 5a. Its internal circuitry includes robust clamping and protection logic that maintains regulation and prevents latch-up. The device continues operation post-transient without reset, and diagnostic flags (e.g., overvoltage on BSTMON) are latched for I²C readback.
What is the purpose of the HDSET pin on the MAX20444BATG/VY+T?
The HDSET pin sets the analog-to-PWM crossover point in hybrid dimming mode: resistor values select 6.25%, 12.5%, 25%, or 50% of full-scale current as the transition threshold. When HDSET is tied to VCC, hybrid dimming is disabled; when tied to GND, default 25% crossover applies. This allows precise tuning of dimming linearity and low-frequency flicker performance.
Can the MAX20444BATG/VY+T be used without an external MOSFET?
No - the MAX20444BATG/VY+T requires external MOSFETs: an n-channel switch driven by NDRV for the boost/SEPIC power stage, and optionally a p-channel MOSFET controlled by PGATE for output overvoltage protection. The IC provides gate drivers and current-sense interfaces but does not integrate power switches, maintaining flexibility for voltage/current scalability.
MAX20444BATG/VY+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:
- Boost, SEPIC
- Internal Switch(s):
- Yes
- Number of Outputs:
- 4
- Voltage - Supply (Min):
- 4.5V
- Voltage - Supply (Max):
- 36V
- Voltage - Output:
- 52V
- Current - Output / Channel:
- -
- Frequency:
- 400kHz ~ 2.2MHz
- Dimming:
- Analog, I2C, PWM
- Applications:
- Backlight
- Operating Temperature:
- -40°C ~ 125°C
- Grade:
- Automotive
- Qualification:
- AEC-Q100
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 24-TQFN (4x4)
MAX20444BATG/VY+T FAQ
1.How can I place an order for MAX20444BATG/VY+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX20444BATG/VY+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 MAX20444BATG/VY+T reliable?
The price and inventory of MAX20444BATG/VY+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX20444BATG/VY+T is usually 5 days.
3.What payment methods are accepted for MAX20444BATG/VY+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX20444BATG/VY+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX20444BATG/VY+T?
MAX20444BATG/VY+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX20444BATG/VY+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 MAX20444BATG/VY+T?
For technical support, including MAX20444BATG/VY+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX20444BATG/VY+T requirements.
6.How does Aetrix verify that MAX20444BATG/VY+T is sourced from the original manufacturer or authorized distributors?
All MAX20444BATG/VY+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 MAX20444BATG/VY+T meets industry standards.
7.What is the process for return or replacement of MAX20444BATG/VY+T?
All MAX20444BATG/VY+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX20444BATG/VY+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 MAX20444BATG/VY+T part is unused and in its original packaging.
Return procedure for MAX20444BATG/VY+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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