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Analog Devices Inc./Maxim Integrated MAX16819ATT+T
- Part No.:
- MAX16819ATT+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- LED Drivers
- Package:
- 6-WDFN Exposed Pad
- Datasheet:
-
MAX16819ATT+T.pdf
- Description:
- IC LED DRIVER CTRLR PWM 6TDFN
- Quantity:
- Payment:
- Shipping:
Inventory:2,325
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Product details
Overview
MAX16819ATT+T from Maxim Integrated is a step-down constant-current high-brightness LED driver IC designed for architectural, ambient, and MR16 LED lighting systems. It operates from 4.5V to 28V input, delivers ±5% LED current accuracy using high-side sensing, supports up to 2MHz switching frequency, and features a dedicated PWM dimming input (DIM) enabling 5000:1 dimming ratio.
For engineers reviewing the MAX16819ATT+T datasheet, MAX16819ATT+T pinout, MAX16819ATT+T application, or MAX16819ATT+T equivalent, this device is selected for cost-sensitive, wide-input-voltage LED drivers requiring precise current regulation, minimal external components, and automotive-grade temperature operation (-40°C to +125°C).
Technical Context
The MAX16819ATT+T implements a hysteretic control architecture with integrated current-sense comparator and gate driver, eliminating need for loop compensation. Its high-side current-sense topology enables direct sensing between IN and CSN, supporting accurate LED current regulation independent of ground path noise.
It integrates a 5V/10mA on-board regulator (VCC), undervoltage lockout (UVLO) with 4.5V turn-on threshold and 500mV hysteresis, and a logic-level DIM input with 2.8V VIH and 0.6V VIL thresholds - all optimized for robust PWM dimming up to 20kHz without external timing components.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 4.5V to 28V - supports wide-range DC inputs including 12V/24V industrial and automotive rails. |
| LED Current Accuracy | ±5% - achieved using high-side sense resistor and internal hysteresis thresholds (VSNSHI/VSENSLO), enabling stable illumination across temperature and line variation. |
| Switching Frequency | Up to 2MHz - allows use of small inductors (e.g., 33µH–47µH) and compact output filters for space-constrained LED modules. |
| PWM Dimming Ratio | 5000:1 - supports deep dimming down to 0.02% duty cycle at 200Hz, verified in typical operating waveforms. |
| Operating Temperature | -40°C to +125°C - qualified for under-hood automotive, outdoor signage, and industrial ambient lighting environments. |
| VCC Regulator Output | 5V ±0.5V @ 10mA - powers external circuitry (e.g., microcontroller bias, level shifters) without auxiliary LDO. |
| Gate Driver Capability | 0.5A source / 1A sink - drives standard n-channel MOSFETs with low RDS(on) and fast switching, minimizing conduction and transition losses. |
Pinout & Package
MAX16819ATT+T is housed in a 3mm × 3mm × 0.8mm, 6-pin TDFN-EP package with exposed paddle for thermal dissipation. The EP pad must be connected to a large-area ground plane per PCB layout guidelines.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1. IN | Positive supply input | Bypassed with ≥1µF capacitor to GND; carries full input current and high di/dt during switching. |
| 2. CSN | High-side current-sense input | Connects to low-side of sense resistor (RSENSE); Kelvin connection recommended to reject noise and ensure ±5% accuracy. |
| 3. DIM | Digital dimming control input | Logic-level interface (VIH = 2.8V, VIL = 0.6V); directly controls regulator enable/disable with <100ns turn-on/off times. |
| 4. GND | Analog and power ground reference | Star-ground point for IN bypass, RSENSE, and output filter; separate from EP pad's thermal ground path. |
| 5. DRV | External MOSFET gate driver output | Drives n-channel MOSFET gate; 0.5A source/1A sink capability supports fast edge rates and low gate charge FETs. |
| 6. VCC | On-chip 5V regulator output | Supplies 10mA max; requires 1µF ceramic capacitor to GND for stability and transient response. |
| EP | Exposed thermal paddle | Must be soldered to PCB ground plane - not used as sole GND connection; improves θJA by >30% vs. non-EP packages. |
Key Features
| Feature | Design Value |
|---|---|
| Hysteretic control architecture | Eliminates external compensation network, reduces BOM count, and ensures fast load-transient response (<100ns propagation delay). |
| High-side current sensing | Enables floating LED string configuration, avoids ground-referenced current errors, and simplifies PCB layout for multi-string designs. |
| Integrated 5V/10mA regulator | Removes need for external bias supply; supports microcontroller, optocoupler, or level-shifter circuits in isolated dimming interfaces. |
| 5000:1 PWM dimming range | Validated at 200Hz and 20kHz frequencies; maintains stable LED current even at 1% duty cycle per oscilloscope waveforms (toc09/toc12). |
| Automotive-grade qualification | Specified over -40°C to +125°C junction temperature; includes 2.5kV HBM ESD rating and 150°C max junction limit. |
Applications
| Architectural Lighting | MR16 LED Bulbs |
|---|---|
|
Use Scenario: Linear LED strips and recessed ceiling fixtures requiring uniform brightness and smooth dimming in commercial buildings. IC Role / Device Role / Timing Role: Constant-current LED driver with high-side sensing and 2MHz switching to minimize inductor size and EMI in tight enclosures. Use Value: ±5% current accuracy ensures consistent lumen output across strings; 5000:1 dimming enables DALI-compatible low-end light levels without flicker. |
Use Scenario: Retrofit MR16 halogen replacement lamps operating from 12V AC/DC transformers. IC Role / Device Role / Timing Role: Step-down HB LED driver managing single or multi-LED strings with wide input tolerance (4.5–28V) and thermal robustness. Use Value: 2MHz operation allows sub-5mm height design; integrated UVLO prevents flicker during transformer brownouts. |
| Industrial Ambient Lighting | Emergency Exit Signs |
|
Use Scenario: High-bay warehouse luminaires powered from 24V DC backup supplies with strict thermal and lifetime requirements. IC Role / Device Role / Timing Role: Primary current regulator driving parallel LED strings via external MOSFET, leveraging high-side sensing for accurate per-string current matching. Use Value: -40°C to +125°C operation ensures reliability in unconditioned spaces; 1454mW power dissipation at 70°C enables passive cooling. |
Use Scenario: Self-contained exit signs with battery-backed LED arrays requiring fail-safe dimming and long-term current stability. IC Role / Device Role / Timing Role: Low-quiescent-current (425µA at VDIM < 0.6V) LED driver enabling >72-hour emergency runtime on sealed lead-acid batteries. Use Value: 5V VCC regulator powers microcontroller-based test/diagnostics; DIM input supports automatic self-test pulsing without external logic. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar constant-current LED driver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX16820ATT+T | 10% inductor current ripple (vs. 30% for MAX16819ATT+T); tighter VSNSHI/VSENSLO hysteresis (17–35mV vs. 56–70mV). | Better suited for low-ripple applications (e.g., camera flash, medical lighting) where LED current stability is critical at low duty cycles. | Select MAX16820ATT+T when lower output ripple and higher dimming fidelity are required; same pinout and footprint. |
| LM3409HVMM/NOPB | Current-mode buck controller (not integrated gate driver); requires external MOSFET and compensation; 4.5–75V input range. | Targets higher-voltage LED strings (e.g., 48V industrial lighting) and offers programmable soft-start, thermal foldback, and adjustable frequency. | Choose LM3409HVMM/NOPB for >28V input or advanced protection features; MAX16819ATT+T offers simpler BOM and smaller solution size below 28V. |
Compared with MAX16820ATT+T, the MAX16819ATT+T trades lower current ripple for higher efficiency at light loads and reduced gate drive loss; versus LM3409HVMM/NOPB, it delivers faster time-to-market with no compensation design but limits maximum input voltage to 28V.
Availability
MAX16819ATT+T is available at Aetrix Electronics and suitable for architectural lighting, MR16 LED bulbs, and emergency exit signs requiring stable component supply, RoHS-compliant packaging, and automotive-grade thermal performance.
Supply support for MAX16819ATT+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
Maxim Integrated (now part of Analog Devices) designs precision analog, mixed-signal, and power management ICs for industrial, automotive, and communications markets.
The MAX16819ATT+T belongs to Maxim's high-brightness LED driver product line, engineered specifically for cost-effective, thermally robust, and dimming-accurate solutions in retrofit and new-build solid-state lighting systems.
FAQ
What is the maximum switching frequency supported by the MAX16819ATT+T?
The MAX16819ATT+T supports up to 2MHz switching frequency, as confirmed in the Electrical Characteristics table and Typical Operating Characteristics plots (toc02). This enables compact magnetic design with 33µH–47µH inductors and reduces output ripple without requiring additional filtering. Operation at 2MHz is stable across the full -40°C to +125°C temperature range and 4.5V–28V input voltage range.
Does the MAX16819ATT+T integrate a gate driver, and what are its drive capabilities?
Yes, the MAX16819ATT+T integrates a high-current gate driver with 0.5A source and 1A sink capability, specified in the Electrical Characteristics table under "Gate Driver Source/Sink Current." This allows direct drive of standard n-channel MOSFETs with low gate charge, minimizing switching losses and eliminating need for external driver stages. The DRV pin output-voltage swing is VCC – 0.5V (high) and 0.5V (low) at ±10mA load.
How does the MAX16819ATT+T achieve ±5% LED current accuracy?
The MAX16819ATT+T achieves ±5% LED current accuracy through high-side current sensing using an external resistor (RSENSE) and internal comparator thresholds (VSNSHI = 213–246mV, VSNSLO = 158–182mV) with 56–70mV hysteresis. Combined with a 1% tolerance RSENSE and Kelvin connection recommendation, this architecture rejects ground noise and maintains accuracy across temperature and input voltage variations, as validated in toc03 and toc14.
What is the purpose of the VCC pin on the MAX16819ATT+T, and how should it be decoupled?
The VCC pin on the MAX16819ATT+T is the output of an integrated 5V regulator capable of supplying up to 10mA. It must be decoupled with a minimum 1µF ceramic capacitor connected directly to GND, as stated in the Pin Description and Applications Information sections. This capacitor ensures regulator stability, suppresses switching noise coupling, and supports transient response for external circuitry such as microcontrollers or level shifters powered from VCC.
Can the MAX16819ATT+T be used in automotive applications, and what qualifications support that use?
Yes, the MAX16819ATT+T is qualified for automotive applications with an operating temperature range of -40°C to +125°C and junction temperature limit of +150°C. It meets automotive reliability requirements including 2.5kV HBM ESD rating, 1454mW power dissipation at +70°C (derated above), and RoHS-compliant TDFN-EP packaging. These specifications are explicitly listed in the Absolute Maximum Ratings and Ordering Information tables.
MAX16819ATT+T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 6-WDFN Exposed Pad
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Type:
- DC DC Controller
- Topology:
- Step-Down (Buck)
- Internal Switch(s):
- No
- Number of Outputs:
- 1
- Voltage - Supply (Min):
- 4.5V
- Voltage - Supply (Max):
- 28V
- Voltage - Output:
- -
- Current - Output / Channel:
- -
- Frequency:
- 2MHz
- Dimming:
- PWM
- Applications:
- Lighting
- Operating Temperature:
- -40°C ~ 125°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 6-TDFN (3x3)
MAX16819ATT+T FAQ
1.How can I place an order for MAX16819ATT+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX16819ATT+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 MAX16819ATT+T reliable?
The price and inventory of MAX16819ATT+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX16819ATT+T is usually 5 days.
3.What payment methods are accepted for MAX16819ATT+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX16819ATT+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX16819ATT+T?
MAX16819ATT+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX16819ATT+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 MAX16819ATT+T?
For technical support, including MAX16819ATT+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX16819ATT+T requirements.
6.How does Aetrix verify that MAX16819ATT+T is sourced from the original manufacturer or authorized distributors?
All MAX16819ATT+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 MAX16819ATT+T meets industry standards.
7.What is the process for return or replacement of MAX16819ATT+T?
All MAX16819ATT+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX16819ATT+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 MAX16819ATT+T part is unused and in its original packaging.
Return procedure for MAX16819ATT+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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