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MAX16822A, MAX16822B
2MHz, High-Brightness LED Drivers with Integrated MOSFET and High-Side Current Sense
High-Voltage, High-Efficiency LED Drivers with Integrated MOSFET Save Space and Cost
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Status
Active: In Production.
Description
The MAX16822A/MAX16822B step-down constant-current high-brightness LED (HB LED) drivers provide a cost-effective design solution for automotive interior/exterior lighting, architectural and ambient lighting, LED bulbs, and other LED illumination applications.
The MAX16822A/MAX16822B operate from a +6.5V to +65V input-voltage range and can provide an output current up to 350mA, if operated up to a temperature of +125°C, or up to 500mA, if operated up to a temperature of +105°C. A high-side current-sense resistor adjusts the output current and a dedicated pulse-width modulation (PWM) input enables pulsed LED dimming over a wide range of brightness levels.
These devices are well suited for applications requiring a wide input-voltage range. The high-side current sensing and an integrated current-setting circuitry minimize the number of external components while delivering an average output current with ±3% accuracy. A hysteretic control method ensures excellent input supply rejection and fast response during load transients and PWM dimming. The MAX16822A allows 10% current ripple and the MAX16822B allows 30% current ripple. Both devices operate up to a switching frequency of 2MHz, thus allowing the use of small-sized components.
The MAX16822A/MAX16822B offer an analog dimming feature that reduces the output current by applying an external DC voltage below the internal 2V threshold voltage from TEMP_I to GND. TEMP_I also sources 25µA to a negative temperature coefficient (NTC) thermistor connected between TEMP_I and GND, thus providing an analog thermal-foldback feature that reduces the LED current when the temperature of the LED string exceeds a specified temperature point.
An additional feature includes thermal-shutdown protection that turns off the LX driver when the junction temperature exceeds +165°C.
The MAX16822A/MAX16822B operate over the -40°C to +125°C automotive temperature range and are available in an 8-pin SO package.
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Data Sheet
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An evaluation kit is available: MAX16822BEVKIT
Key Features
- High-Efficiency Solution
- 6.5V to 65V Input-Voltage Range
- Output Current Up to 500mA
- On-Board 65V, 0.85Ω Power MOSFET
- Hysteretic Control: Up to 2MHz Switching Frequency
- ±3% LED Current Accuracy
- 200mV Current-Sense Reference
- Resistor-Programmable Constant LED Current
- Integrated High-Side Current Sense
- Thermal-Foldback Protection/Linear Dimming
- Thermal-Shutdown Protection
- Available in an 8-Pin SO Package
- -40°C to +125°C Operating Temperature Range
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Applications/Uses
- Architectural, Industrial, and Ambient Lighting
- Automotive RCL, DRL, and Fog Lights
- Heads-Up Displays
- Indicator and Emergency Lighting
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Key Specifications:
| High Brightness LED Drivers |
| Part Number |
Topology |
Device VIN
(V) |
Device VIN
(V) |
LED Channels |
ILED per Channel
(A) |
LED String Volt.
(V) |
Internal Pwr. MOSFETs |
Freq.
(kHz) |
PWM Dimming Freq.
(kHz) |
PWM Dimming Ratio |
EV Kit |
Budgetary Price |
| max |
min |
max |
max |
max |
max |
max |
See Notes |
| MAX16822 |
Buck |
65 |
6.5 |
|
0.35 |
63 |
Yes |
2000 |
20 |
200 |
Yes |
$1.47 @1k |
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See All High Brightness LED Drivers (25)
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Pricing Notes:
This pricing is BUDGETARY, for comparing similar parts. Prices are in U.S. dollars and subject to change. Quantity pricing may vary substantially and international prices may differ due to local duties, taxes, fees, and exchange rates. For volume-specific prices and delivery, please see the price and availability page or contact an authorized distributor.
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Diagram
Typical Application Circuit
More Information
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Information Index
Document Ref.: 19-4141
Rev 3;
2010-03-10
This page last modified: 2010-05-06
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