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Analog Devices Inc./Maxim Integrated MAX16822AASA+
- Part No.:
- MAX16822AASA+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- LED Drivers
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
MAX16822AASA+.pdf
- Description:
- IC LED DRV RGLTR PWM 350MA 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:614
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Product details
Overview
MAX16822AASA+ from Maxim Integrated is a step-down constant-current high-brightness LED driver IC with integrated 65V/0.85Ω MOSFET, high-side current sensing, and hysteretic control. It operates from 6.5V to 65V input, delivers up to 500mA output current (at ≤+105°C), achieves ±3% LED current accuracy, and supports PWM and analog dimming for automotive RCL/DRL lighting.
For engineers reviewing the MAX16822AASA+ datasheet, MAX16822AASA+ pinout, MAX16822AASA+ application, or MAX16822AASA+ equivalent, this page provides verified technical context, real-world design meaning of key specs, validated pin functions, thermal-foldback behavior, and confirmed alternative options for LED driver selection in wide-input-voltage lighting systems.
Technical Context
The MAX16822AASA+ uses a hysteretic current-mode control architecture with programmable upper/lower sense thresholds (VSNSHI = 210mV typ, VSNSLO = 190mV typ) to regulate LED current without external compensation. Its internal 65V DMOS switch and high-side sensing enable compact buck topology operation across 6.5–65V input while maintaining stable current regulation under load transients.
It integrates dual dimming paths: logic-level PWM at DIM pin (VIH = 2.8V, VIL = 0.6V) and analog dimming via TEMP_I pin, where an internal 25µA current source enables NTC-based thermal foldback or DC voltage-controlled current reduction with VTFB_ON = 2.0V and FBSLOPE = 0.75 1/V.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 6.5V to 65V - supports direct connection to automotive battery (12V/24V/48V) and industrial DC bus without pre-regulation. |
| Max Output Current | 500mA at ≤+105°C - enables driving multi-LED strings (e.g., 9–15 LEDs at 48V) with full thermal margin in DRL modules. |
| LED Current Accuracy | ±3% - achieved using internal sense comparator and 1% external RSENSE, reducing calibration overhead in production. |
| Switching Frequency | Up to 2MHz - allows use of small 220µH inductors and compact 1µF CVCC, minimizing PCB area in space-constrained headlight modules. |
| Current-Sense Reference | 200mV nominal - sets RSENSE value directly (e.g., 0.62Ω for 323mA), simplifying current programming and improving noise immunity vs. low-mV references. |
| Thermal Protection | 165°C shutdown with 10°C hysteresis - prevents permanent damage during sustained overtemperature events in enclosed lamp housings. |
| Thermal Foldback | Activates when TEMP_I voltage drops below 2.0V - linearly reduces LED current via NTC thermistor feedback to maintain safe junction temperature. |
Pinout & Package
MAX16822AASA+ is housed in an 8-pin SO (Small Outline) package, RoHS-compliant and qualified for automotive (-40°C to +125°C) operation. The exposed pad is not electrically connected; thermal performance relies on PCB copper area under PGND/GND pins.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 CS | Current-Sense Input | High-side sense node; connects to resistor between IN and CS to set LED current threshold with ±3% accuracy. |
| 2 IN | Positive Supply Input | Accepts 6.5–65V; requires ≥1µF ceramic bypass capacitor to GND for stable switching and EMI suppression. |
| 3 GND | Analog Ground | Reference for internal bandgap, comparators, and TEMP_I; must be star-connected to PGND near device to minimize noise coupling. |
| 4 PGND | Power Ground | High-current return path for LX switch and LED string; connects to power ground plane to reduce voltage spikes and improve efficiency. |
| 5,6 LX | Switching Node | Drain of internal 65V/0.85Ω MOSFET; connects to inductor and freewheeling diode; layout critical for EMI and thermal performance. |
| 7 DIM | PWM Dimming Input | Logic-level control: <0.6V disables LED current, >2.8V enables regulation; supports 200Hz–20kHz PWM dimming with fast turn-on/off (<200ns). |
| 8 TEMP_I | Thermal Foldback & Analog Dim Input | Sources 25µA; used for NTC-based thermal foldback or DC voltage dimming; requires 0.01µF bypass if active to suppress noise-induced false triggering. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated 65V, 0.85Ω Power MOSFET | Eliminates external high-voltage switch, reduces BOM count by 1 component, and ensures matched gate drive timing for reliable 2MHz operation. |
| Hysteretic Control Architecture | Enables stable current regulation without loop compensation components, delivering fast transient response (<50ns propagation delay) during PWM dimming edges. |
| Resistor-Programmable LED Current | Uses single external RSENSE between IN and CS to set current; eliminates DACs or digital interfaces while retaining ±3% accuracy with 1% resistor. |
| Dual Dimming Interface | Supports both PWM (via DIM pin) and analog (via TEMP_I) dimming in same device-enables flexible system-level brightness control without redesign. |
| On-Chip Thermal Foldback | Reduces LED current linearly as LED string temperature rises-prevents thermal runaway in sealed fixtures without external sensors or microcontroller intervention. |
Applications
| Automotive Rear Combination Lamps (RCL) | Automotive Daytime Running Lights (DRL) |
|---|---|
Use Scenario: LED arrays in tail lamps requiring stable current across 9–16V battery variations and -40°C to +85°C ambient. IC Role / Device Role / Timing Role: Constant-current buck controller regulating 350mA through 5–9 red/amber LEDs with PWM dimming for brake/tail differentiation. Use Value: ±3% current accuracy ensures consistent luminance across units; 65V rating handles load-dump transients up to ISO 7637-2 Pulse 5a. |
Use Scenario: High-intensity white LED strings mounted in front bumper, operating continuously at elevated ambient temperatures. IC Role / Device Role / Timing Role: Primary LED driver with thermal foldback, reducing current from 500mA to 200mA as housing temperature exceeds 85°C. Use Value: Prevents LED lumen depreciation and color shift by limiting junction temperature; eliminates need for external thermal management circuitry. |
| Architectural Accent Lighting | Industrial Indicator Panels |
Use Scenario: Long LED strips powered from 24V/48V DC distribution rails in commercial buildings, subject to voltage ripple and partial shading. IC Role / Device Role / Timing Role: Buck LED driver per strip segment, using high-side sensing to reject common-mode noise from shared power rails. Use Value: 2MHz switching enables use of tiny 1206-size inductors and 0805 capacitors, allowing ultra-thin profile integration behind aluminum extrusions. |
Use Scenario: Status indicators in factory HMIs where reliability and long service life are critical under continuous 24/7 operation. IC Role / Device Role / Timing Role: Constant-current source for single-color or RGB indicator LEDs, with DIM pin driven by PLC I/O for status signaling. Use Value: Integrated thermal shutdown (165°C) and foldback protect against failure due to enclosure overheating or fan failure, extending MTBF beyond 10 years. |
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 |
|---|---|---|---|
| MAX16822BASA+ | Higher current ripple (30% vs. 10% for MAX16822A); VSNSHI = 230mV, VSNSLO = 170mV - results in lower average current for same RSENSE. | Better suited for applications tolerant of higher ripple (e.g., non-flicker-sensitive architectural lighting) where higher peak current improves efficiency at light loads. | Select MAX16822BASA+ only when ripple sensitivity is low and higher peak inductor current is acceptable for thermal design. |
| LM3409HVMM/NOPB | External MOSFET required; 75V max VIN; no integrated thermal foldback; uses current-mode PWM control instead of hysteretic. | Requires additional gate driver and sense amplifier; supports higher power (>1A) but increases board area and component count. | Choose LM3409HVMM/NOPB when >500mA output or custom MOSFET selection (e.g., SiC) is needed - not a drop-in replacement. |
Compared with MAX16822BASA+, the MAX16822AASA+ offers tighter current ripple (10%) and higher sense threshold stability, making it preferable for flicker-critical automotive lighting. Against LM3409HVMM/NOPB, MAX16822AASA+ reduces bill-of-materials and layout complexity but caps at 500mA and lacks programmable frequency.
Availability
MAX16822AASA+ is available at Aetrix Electronics and suitable for automotive lighting, industrial indicator panels, and architectural accent lighting requiring stable component supply, AEC-Q100 compliance, and long-term lifecycle support.
Supply support for MAX16822AASA+ 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 MAX16822AASA+ belongs to Maxim's high-voltage LED driver product line, engineered specifically for cost-sensitive, wide-input automotive and industrial lighting where integration, thermal robustness, and ±3% current accuracy are mandatory.
FAQ
What is the maximum allowable input voltage for MAX16822AASA+?
The MAX16822AASA+ supports an absolute maximum input voltage of +70V, with guaranteed operation from +6.5V to +65V. This range accommodates automotive battery fluctuations, including cold-crank (down to ~6.5V) and load-dump transients (up to 65V), ensuring reliable function in RCL and DRL systems without external clamping.
Does MAX16822AASA+ support analog dimming, and how is it implemented?
Yes, MAX16822AASA+ supports analog dimming via the TEMP_I pin. An internal 25µA current source biases an external NTC thermistor or DC voltage divider; when the voltage at TEMP_I falls below 2.0V, LED current reduces linearly per the formula ILED = ILED_MAX × (1 − (2.0V − VTEMP_I) × 0.75). This enables smooth thermal foldback or manual brightness control without PWM artifacts.
What is the purpose of the CS pin on MAX16822AASA+, and how is it used in circuit design?
The CS pin on MAX16822AASA+ is the high-side current-sense input that monitors voltage across an external resistor (RSENSE) placed between IN and CS. It triggers the internal comparator to turn off the MOSFET when the sensed voltage reaches VSNSHI (210mV typ), enabling precise constant-current regulation. Proper Kelvin routing of CS near RSENSE minimizes noise-induced errors and ensures ±3% accuracy.
How does thermal shutdown work in MAX16822AASA+, and what happens after activation?
MAX16822AASA+ activates thermal shutdown when its junction temperature exceeds +165°C, turning off the LX driver immediately. The device remains latched off until the junction cools by at least 10°C (hysteresis), at which point regulation resumes automatically. This protects the IC and LED load during sustained overtemperature conditions such as blocked heatsinks or ambient >105°C in sealed lamp housings.
Can MAX16822AASA+ drive multiple LEDs in series, and what limits the string length?
Yes, MAX16822AASA+ can drive LED strings in series. The maximum number depends on total forward voltage: with VIN = 48V and typical VLED = 3.2V per white LED, up to 14 LEDs (44.8V) fit within headroom. The 65V input rating and internal 65V MOSFET allow margin for voltage ripple and transient spikes, but string voltage must remain below VIN minus dropout (~1.5V) to sustain regulation.
MAX16822AASA+ 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
MAX16822AASA+ FAQ
1.How can I place an order for MAX16822AASA+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX16822AASA+ 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 MAX16822AASA+ reliable?
The price and inventory of MAX16822AASA+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX16822AASA+ is usually 5 days.
3.What payment methods are accepted for MAX16822AASA+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX16822AASA+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX16822AASA+?
MAX16822AASA+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX16822AASA+ 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 MAX16822AASA+?
For technical support, including MAX16822AASA+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX16822AASA+ requirements.
6.How does Aetrix verify that MAX16822AASA+ is sourced from the original manufacturer or authorized distributors?
All MAX16822AASA+ 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 MAX16822AASA+ meets industry standards.
7.What is the process for return or replacement of MAX16822AASA+?
All MAX16822AASA+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX16822AASA+, 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 MAX16822AASA+ part is unused and in its original packaging.
Return procedure for MAX16822AASA+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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