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Analog Devices Inc./Maxim Integrated MAX16820ATT+T
- Part No.:
- MAX16820ATT+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- LED Drivers
- Package:
- 6-WDFN Exposed Pad
- Datasheet:
-
MAX16820ATT+T.pdf
- Description:
- IC LED DRIVER CTRLR PWM 6TDFN
- Quantity:
- Payment:
- Shipping:
Inventory:3,684
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Product details
Overview
MAX16820ATT+T from Maxim Integrated is a step-down constant-current high-brightness LED driver IC with high-side current sensing, 10% inductor current ripple, ±5% LED current accuracy, and 4.5V–28V input range-designed for MR16 LED bulbs and architectural lighting systems requiring stable dimming control.
For engineers reviewing the MAX16820ATT+T datasheet, MAX16820ATT+T pinout, MAX16820ATT+T application, or MAX16820ATT+T equivalent, this device supports 2MHz switching, 5000:1 PWM dimming at up to 20kHz, and operates across -40°C to +125°C in a 6-pin TDFN-EP package with exposed thermal pad.
Technical Context
The MAX16820ATT+T implements a hysteretic current-mode control architecture that eliminates loop compensation and delivers fast transient response during PWM dimming and load changes. Its dedicated DIM input accepts logic-level signals (VIH = 2.8V, VIL = 0.6V) and enables precise pulsed dimming without affecting current regulation accuracy.
It integrates a 5V/10mA on-board regulator (VCC), a high-speed gate driver (0.5A source / 1A sink), and a precision current-sense comparator with 17mV–35mV hysteresis (VSNSHI = 195–225mV, VSNSLO = 176–204mV), optimized for ±5% LED current accuracy using a 1% RSENSE resistor.
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 LED lighting rails. |
| Switching Frequency | Up to 2MHz - enables use of small inductors (e.g., 33µH–47µH) and compact PCB layout. |
| LED Current Accuracy | ±5% - achieved with internal hysteresis-controlled current sensing and 1% external RSENSE. |
| PWM Dimming Range | 5000:1 - supports deep dimming down to 0.02% duty cycle at 200Hz, verified per typical operating curves. |
| DIM Input Frequency Limit | 20kHz - allows high-frequency flicker-free dimming compatible with human vision persistence thresholds. |
| Operating Temperature | -40°C to +125°C - qualified for under-hood automotive and high-ambient industrial LED applications. |
| Current-Sense Threshold Hysteresis | 17mV to 35mV - lower hysteresis vs. MAX16819 (56–70mV), enabling tighter current ripple control (10% vs. 30%). |
Pinout & Package
MAX16820ATT+T is housed in a 3mm × 3mm × 0.8mm, 6-pin TDFN-EP package with exposed thermal pad (EP) for enhanced power dissipation. The EP must be connected to a large-area ground plane; it is not a functional pin but critical for thermal performance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 IN | Positive supply input | Bypassed with ≥1µF capacitor to GND; carries full input current and must be routed with low-inductance path. |
| 2 CSN | High-side current-sense input | Connects to low-side of RSENSE; Kelvin connection recommended to reject noise and ensure ±5% accuracy. |
| 3 DIM | Digital dimming control input | Logic-compatible (0.6V/2.8V thresholds); controls DRV output directly-no internal pull-up/pull-down required. |
| 4 GND | Analog/digital ground reference | Star-ground point for IN bypass, RSENSE, and EP; separates power and signal return paths. |
| 5 DRV | N-channel MOSFET gate driver output | 0.5A source / 1A sink capability; drives external FET with minimal external components. |
| 6 VCC | On-chip 5V regulator output | Supplies 10mA max; requires 1µF ceramic capacitor to GND for stability and transient response. |
| EP | Exposed thermal pad | Must be soldered to solid copper ground plane; improves θJA by >30% and enables 1454mW continuous dissipation at TA = +70°C. |
Key Features
| Feature | Design Value |
|---|---|
| Hysteretic control architecture | Eliminates external compensation network, reduces BOM count, and ensures stable operation across input/load transients. |
| 10% LED current ripple | Lower than MAX16819's 30%, enabling smoother light output and reduced EMI in sensitive ambient lighting environments. |
| Integrated 5V/10mA regulator | Power sources external circuitry (e.g., microcontroller bias, sensor interface) without secondary LDO. |
| High-side current sensing | Enables common-cathode LED string configuration, simplifies thermal management, and avoids ground-referenced sensing errors. |
| 20kHz maximum DIM frequency | Supports flicker-free dimming above 1.2kHz perceptual threshold, meeting IEC TR 61547-1 requirements for visible-light applications. |
Applications
| Architectural Lighting | MR16 LED Bulbs |
|---|---|
|
Use Scenario: Linear LED strips and recessed ceiling fixtures requiring uniform brightness and smooth dimming across wide ambient temperature ranges (-40°C to +125°C). IC Role / Device Role / Timing Role: Constant-current LED driver with high-side sensing and 2MHz switching, regulating current through multi-LED strings while rejecting line and load variations. Use Value: ±5% current accuracy ensures consistent lumen output across units; 5000:1 dimming enables museum-grade low-light control without color shift. |
Use Scenario: Retrofit MR16 halogen replacement lamps operating from 12V AC/DC transformers in residential and hospitality settings. IC Role / Device Role / Timing Role: Step-down HB LED driver controlling single or dual high-power LEDs with integrated gate drive and on-chip 5V bias rail. Use Value: 10% current ripple minimizes audible coil whine; TDFN-EP package fits tight MR16 thermal envelopes while maintaining >85% efficiency at 12V input. |
| Industrial Ambient Lighting | Emergency Exit Signage |
|
Use Scenario: High-bay warehouse lighting powered from 24V DC backup supplies, requiring long-life operation and immunity to voltage sags. IC Role / Device Role / Timing Role: Primary current regulator with UVLO (4.5V trip, 0.5V hysteresis) and robust gate drive for driving high-VDS MOSFETs in harsh electrical environments. Use Value: Undervoltage lockout prevents erratic dimming during brownouts; ±5% accuracy maintains compliance with EN 62471 photobiological safety limits. |
Use Scenario: Self-contained exit signs with battery-backed LED arrays needing reliable low-duty-cycle dimming during standby and full brightness during alarm events. IC Role / Device Role / Timing Role: PWM-dimmable constant-current controller interfacing directly with microcontroller GPIO and supporting rapid on/off transitions (tDIMON/tDIMOFF = 100ns). Use Value: 20kHz DIM capability enables silent, imperceptible standby dimming; -40°C to +125°C rating ensures operation in unconditioned stairwells and parking garages. |
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 |
|---|---|---|---|
| MAX16819ATT+T | 30% inductor current ripple, higher sense-threshold hysteresis (56–70mV), identical pinout and package. | Better suited for cost-sensitive applications where ripple-induced EMI is less critical than component count. | Select MAX16819ATT+T when 10% ripple is unnecessary and higher ripple tolerance simplifies inductor selection. |
| LM3409HVMM/NOPB | Adjustable frequency (200kHz–2MHz), no integrated VCC regulator, requires external bias supply. | Used in high-voltage (>42V) LED systems where MAX16820ATT+T's 28V VIN limit is insufficient. | Choose LM3409HVMM/NOPB only when input exceeds 28V or when programmable frequency is required for EMI tuning. |
Compared with MAX16819ATT+T and LM3409HVMM/NOPB, the MAX16820ATT+T uniquely combines 10% current ripple, integrated 5V/10mA regulator, and guaranteed -40°C to +125°C operation in a 6-pin TDFN-making it optimal for compact, thermally constrained, high-fidelity LED lighting designs.
Availability
MAX16820ATT+T is available at Aetrix Electronics and suitable for architectural lighting, MR16 LED bulb replacements, and emergency signage requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.
Supply support for MAX16820ATT+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) is a semiconductor company specializing in analog, mixed-signal, and power-management ICs for industrial, automotive, and consumer applications.
The MAX16819/MAX16820 product line was designed specifically for high-efficiency, high-accuracy constant-current LED drivers in space-constrained and thermally demanding lighting systems-emphasizing integration, reliability, and wide-input operation.
FAQ
What is the maximum input voltage supported by the MAX16820ATT+T?
The MAX16820ATT+T supports an absolute maximum input voltage of 30V, with specified operational range from 4.5V to 28V. This makes it suitable for 12V and 24V DC lighting rails, including automotive 24V systems and industrial 24V power supplies. Exceeding 28V may trigger undervoltage lockout or damage the IN pin if sustained beyond absolute maximum ratings.
Does the MAX16820ATT+T include an integrated voltage regulator?
Yes, the MAX16820ATT+T integrates a 5V linear regulator on the VCC pin, capable of sourcing up to 10mA. It is internally trimmed to 4.5V–5.5V over temperature and load, and requires a 1µF ceramic capacitor from VCC to GND for stability. This regulator powers internal circuitry and can optionally bias external components like microcontrollers or sensors.
How does the MAX16820ATT+T achieve ±5% LED current accuracy?
The MAX16820ATT+T achieves ±5% LED current accuracy through a combination of precision internal current-sense comparators (VSNSHI = 195–225mV, VSNSLO = 176–204mV), low-drift hysteresis (17–35mV), and compatibility with 1% tolerance external RSENSE resistors. The high-side sensing topology avoids ground-path errors, and the hysteretic control eliminates compensation-related drift across temperature and input voltage.
What is the purpose of the exposed pad (EP) on the MAX16820ATT+T package?
The exposed pad (EP) on the MAX16820ATT+T is a thermal pad-not an electrical pin-that must be soldered to a large-area PCB ground plane. It reduces thermal resistance (θJA) by >30%, enabling 1454mW continuous power dissipation at +70°C ambient. Using EP as the sole ground connection is prohibited; functional GND (Pin 4) must remain connected separately for signal integrity.
Can the MAX16820ATT+T drive multiple LEDs in series?
Yes, the MAX16820ATT+T is designed to drive series-connected LED strings. Its high-side current sensing and external MOSFET gate drive allow flexible string configuration-limited only by total forward voltage (VF) and input voltage headroom. For example, with VIN = 24V and typical white LED VF ≈ 3.2V, up to seven LEDs can be driven while maintaining sufficient dropout for regulation and dimming fidelity.
MAX16820ATT+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)
MAX16820ATT+T FAQ
1.How can I place an order for MAX16820ATT+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX16820ATT+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 MAX16820ATT+T reliable?
The price and inventory of MAX16820ATT+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX16820ATT+T is usually 5 days.
3.What payment methods are accepted for MAX16820ATT+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX16820ATT+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX16820ATT+T?
MAX16820ATT+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX16820ATT+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 MAX16820ATT+T?
For technical support, including MAX16820ATT+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX16820ATT+T requirements.
6.How does Aetrix verify that MAX16820ATT+T is sourced from the original manufacturer or authorized distributors?
All MAX16820ATT+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 MAX16820ATT+T meets industry standards.
7.What is the process for return or replacement of MAX16820ATT+T?
All MAX16820ATT+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX16820ATT+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 MAX16820ATT+T part is unused and in its original packaging.
Return procedure for MAX16820ATT+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
MAX16820ATT+T Tags
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