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Analog Devices Inc./Maxim Integrated MAX16822BASA+
- Part No.:
- MAX16822BASA+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- LED Drivers
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
MAX16822BASA+.pdf
- Description:
- IC LED DRV RGLTR PWM 350MA 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:500
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Product details
Overview
MAX16822BASA+ from Maxim Integrated is a step-down constant-current high-brightness LED driver IC with integrated 65V/0.85Ω MOSFET and high-side current sensing, delivering up to 500mA output current at ≤+105°C or 350mA at ≤+125°C, operating from 6.5V to 65V input, and supporting PWM and analog dimming for automotive RCL/DRL lighting systems.
For engineers reviewing the MAX16822BASA+ datasheet, MAX16822BASA+ pinout, MAX16822BASA+ application, or MAX16822BASA+ equivalent, key selection considerations include its ±3% LED current accuracy, 2MHz hysteretic switching frequency, thermal-foldback via TEMP_I pin, 8-pin SO package, and differential current-sense threshold (218–236mV high / 166–180mV low) distinguishing it from the MAX16822A variant.
Technical Context
The MAX16822BASA+ uses a hysteretic control architecture with fixed upper/lower current-sense thresholds (VSNSHI = 218–236mV, VSNSLO = 166–180mV), enabling fast transient response and input supply rejection without external compensation. Its integrated 65V DMOS switch and on-chip bandgap reference eliminate need for external gate drivers or voltage references.
Thermal management is implemented via dual-stage protection: analog thermal-foldback triggered by NTC thermistor bias current (25–28µA from TEMP_I) and hard thermal shutdown at +165°C with 10°C hysteresis. Dimming is supported through dedicated DIM pin (VIH = 2.8V, VIL = 0.6V) and linear control via TEMP_I voltage below 2.0V threshold.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 6.5V to 65V - supports direct connection to automotive battery (12V/24V/48V systems) and industrial DC rails without pre-regulation. |
| Max Output Current | 500mA at ≤+105°C or 350mA at ≤+125°C - defines thermal derating envelope for continuous LED string drive in enclosed fixtures. |
| Current Sense Accuracy | ±3% - achieved using internal 200mV reference and 1% external RSENSE, enabling precise luminous flux control across temperature. |
| Switching Frequency | Up to 2MHz - allows use of compact 220µH inductors and reduces EMI filter size in space-constrained lighting modules. |
| Sense Thresholds | VSNSHI = 218–236mV, VSNSLO = 166–180mV - 30% current ripple specification (vs. MAX16822A's 10%) enables higher efficiency at light loads. |
| Thermal Foldback | VTFB_ON = 1.9–2.12V, FBSLOPE = 0.75/V - provides predictable LED current reduction vs. NTC voltage, preventing thermal runaway in high-power arrays. |
| Integrated MOSFET | 65V VDS, 0.85Ω RDSON at 24V - eliminates external switch, reducing BOM count and PCB area in buck LED drivers. |
Pinout & Package
MAX16822BASA+ is housed in an 8-pin SO (Small Outline) package (package code S8-2), RoHS-compliant, with exposed pad not electrically connected. Pin layout optimized for minimal high-current loop area and Kelvin sense routing.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - CS | High-side current-sense input | Connects to top of RSENSE; senses voltage drop to regulate LED current with ±3% accuracy. |
| 2 - IN | Positive supply input | Accepts 6.5–65V; requires ≥1µF bypass capacitor to GND for stability and noise suppression. |
| 3 - GND | Analog ground reference | Reference for internal comparators and bandgap; must be star-connected to PGND near CS/IN. |
| 4 - PGND | Power ground return | Carries high pulsed LX current; separate from GND to avoid noise coupling into sense path. |
| 5,6 - LX | Switching node | Drives external inductor; connects to source of internal MOSFET and cathode of freewheeling diode. |
| 7 - DIM | Digital dimming control | Logic-level input: <0.6V disables LED current, >2.8V enables; supports 200Hz–20kHz PWM dimming. |
| 8 - TEMP_I | Thermal foldback & analog dimming | Sources 25–28µA; used with NTC thermistor or external voltage to reduce LED current below 2.0V threshold. |
Key Features
| Feature | Design Value |
|---|---|
| Hysteretic constant-current regulation | Eliminates need for error amplifier and compensation network; enables stable operation across wide VIN and LED VF variations. |
| Integrated 65V/0.85Ω power MOSFET | Reduces component count by 1 transistor and associated gate drive circuitry; simplifies layout and improves reliability. |
| Resistor-programmable LED current | Set via single RSENSE between IN and CS; supports 50–500mA range with standard 1% metal-film resistors. |
| Dual dimming interface | PWM via DIM pin + analog via TEMP_I pin - enables hybrid dimming strategies for flicker-free operation and thermal derating. |
| Thermal-foldback with NTC bias | Internal 25µA current source enables direct NTC connection without external bias resistor; provides monotonic current reduction. |
| Automotive-grade temperature range | -40°C to +125°C junction operation - qualified for under-hood and exterior lighting applications per AEC-Q100 guidelines. |
Applications
| Automotive RCL/DRL | Architectural Accent Lighting |
|---|---|
Use Scenario: Daytime running lights and rear combination lamps in 12V/24V vehicle platforms requiring robust EMI performance and thermal resilience. IC Role / Device Role / Timing Role: Constant-current buck controller regulating 3–15 LED strings with programmable current and thermal foldback. Use Value: Enables single-chip solution for 500mA LED drive at ambient temperatures up to +105°C, eliminating discrete MOSFET and current-sense amplifier. |
Use Scenario: Linear LED strips and cove lighting in commercial buildings where long-term lumen maintenance and thermal stability are critical. IC Role / Device Role / Timing Role: High-efficiency step-down LED driver with 2MHz switching to minimize inductor size and enable slim-profile fixtures. Use Value: ±3% current accuracy ensures uniform brightness across distributed lighting zones; 65V input supports multi-string series configurations. |
| Heads-Up Display (HUD) Backlight | Emergency Exit Signage |
Use Scenario: Compact HUD projector backlight requiring flicker-free dimming and rapid brightness adjustment during vehicle motion. IC Role / Device Role / Timing Role: Analog + PWM dimming controller using TEMP_I for smooth linear dimming and DIM pin for high-frequency PWM modulation. Use Value: Dual-dimming capability achieves >1000:1 contrast ratio without visible steps; 20ns DIM turn-on time ensures tight timing control. |
Use Scenario: UL924-compliant emergency egress signage with battery backup, requiring fail-safe thermal management and wide-input operation. IC Role / Device Role / Timing Role: Fault-tolerant LED driver with thermal shutdown (+165°C) and foldback to maintain illumination during overtemperature events. Use Value: Prevents LED thermal runaway during extended battery operation; 6.5V UVLO ensures reliable start-up even with weak backup batteries. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar LED driver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX16822AASA+ | Lower current ripple (10% vs. 30%), tighter sense thresholds (201–216mV / 185–198mV), same pinout and package. | Better suited for low-noise, high-accuracy applications like medical displays where ripple-induced flicker must be minimized. | Select MAX16822AASA+ when ±1% current ripple is required; MAX16822BASA+ preferred for higher efficiency at light loads. |
| LM3409HVMM/NOPB | External MOSFET required, 75V max input, no integrated thermal foldback, 1.25V current-sense reference. | Requires additional components for thermal protection and current setting; better for designs needing >500mA or custom MOSFET selection. | Choose LM3409HVMM/NOPB when higher output current (>500mA) or external FET control is needed; MAX16822BASA+ offers lower BOM count. |
Compared with MAX16822AASA+, the MAX16822BASA+ trades tighter current regulation for higher light-load efficiency via wider hysteresis; versus LM3409HVMM/NOPB, it delivers full integration but limits max current to 500mA and lacks adjustable switching frequency.
Availability
MAX16822BASA+ is available at Aetrix Electronics and suitable for automotive lighting, architectural LED systems, and emergency signage requiring stable component supply, long-lifecycle support, and AEC-Q100-aligned reliability.
Supply support for MAX16822BASA+ 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 markets.
The MAX16822BASA+ belongs to Maxim's high-voltage LED driver product line, engineered specifically for cost-sensitive, thermally demanding automotive and architectural lighting where integration, accuracy, and ruggedness are essential.
FAQ
What is the maximum LED output current supported by the MAX16822BASA+?
The MAX16822BASA+ supports up to 500mA output current when operated at junction temperatures ≤+105°C, and up to 350mA at ≤+125°C. This thermal derating is defined in the Absolute Maximum Ratings table and verified across the -40°C to +125°C ambient range. The actual current is set by the external RSENSE resistor and the device's internal sense thresholds (VSNSHI = 218–236mV).
How does the MAX16822BASA+ implement thermal foldback?
The MAX16822BASA+ implements thermal foldback via the TEMP_I pin, which sources a precise 25–28µA current to bias an NTC thermistor. When the resulting voltage drops below the internal 1.9–2.12V threshold (VTFB_ON), the device linearly reduces LED current using a slope of 0.75/V. This analog foldback prevents thermal runaway without requiring microcontroller intervention, and is distinct from the hard thermal shutdown at +165°C.
What are the key differences between MAX16822BASA+ and MAX16822AASA+?
The MAX16822BASA+ differs from MAX16822AASA+ primarily in its current-sense hysteresis: MAX16822BASA+ uses wider thresholds (VSNSHI = 218–236mV, VSNSLO = 166–180mV) enabling up to 30% current ripple, while MAX16822AASA+ uses tighter thresholds (201–216mV / 185–198mV) limiting ripple to 10%. Both share identical pinout, package, and functional features, but MAX16822BASA+ prioritizes efficiency at light loads.
Can the MAX16822BASA+ drive multiple LED strings in parallel?
No - the MAX16822BASA+ is designed for single-string constant-current operation. Driving multiple parallel LED strings would cause current imbalance due to forward-voltage mismatches, violating the ±3% accuracy specification. For multi-string applications, separate MAX16822BASA+ units or a matrix driver IC should be used to ensure matched current regulation per string.
What package type and RoHS status does the MAX16822BASA+ have?
The MAX16822BASA+ is supplied in an 8-pin SO (Small Outline) package (JEDEC MO-153, package code S8-2), with lead(Pb)-free and RoHS-compliant construction indicated by the "+" suffix. The package has no exposed thermal pad, and thermal performance is characterized with θJA = 136°C/W on a 4-layer board per JEDEC JESD51-7.
MAX16822BASA+ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tube
- Product Status:
- Active
- Type:
- DC DC Regulator
- Topology:
- Step-Down (Buck)
- Internal Switch(s):
- Yes
- Number of Outputs:
- 1
- Voltage - Supply (Min):
- 6.5V
- Voltage - Supply (Max):
- 65V
- Voltage - Output:
- -
- Current - Output / Channel:
- 350mA
- Frequency:
- 2MHz
- Dimming:
- PWM
- Applications:
- Lighting
- Operating Temperature:
- -40°C ~ 125°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SOIC
MAX16822BASA+ FAQ
1.How can I place an order for MAX16822BASA+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX16822BASA+ 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 MAX16822BASA+ reliable?
The price and inventory of MAX16822BASA+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX16822BASA+ is usually 5 days.
3.What payment methods are accepted for MAX16822BASA+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX16822BASA+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX16822BASA+?
MAX16822BASA+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX16822BASA+ 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 MAX16822BASA+?
For technical support, including MAX16822BASA+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX16822BASA+ requirements.
6.How does Aetrix verify that MAX16822BASA+ is sourced from the original manufacturer or authorized distributors?
All MAX16822BASA+ 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 MAX16822BASA+ meets industry standards.
7.What is the process for return or replacement of MAX16822BASA+?
All MAX16822BASA+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX16822BASA+, 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 MAX16822BASA+ part is unused and in its original packaging.
Return procedure for MAX16822BASA+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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