MAX16822A, MAX16822B 2MHz, High-Brightness LED Drivers with Integrated MOSFET and High-Side Current Sense

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.

An evaluation kit is available: MAX16822BEVKIT

Key Features

Applications/Uses

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

	Architectural, Industrial, and Ambient Lighting
	Automotive RCL, DRL, and Fog Lights
	Heads-Up Displays
	Indicator and Emergency Lighting

Key Specifications: High Brightness LED Drivers

Part Number

Topology

V_IN
(V)

Extended V_IN with External Bias

LED Channels

I_LED per Channel
(A)

LED String Volt.

Internal Pwr. MOSFETs

Freq.

PWM Dimming Freq.
(kHz)

PWM Dimming Ratio

EV Kit

Price

min

max

See Notes

MAX16822

Buck

6.5

0.35

63V

Yes

20kHz to 2MHz

1:5000

Yes

$0.99 @1k

See All High Brightness LED Drivers (26)

Diagram

Typical Application Circuit

Application Notes

Application Note 4619: Logic-Level Signals Dim -48V LED Driver - MAX16822

Evaluation Kits

MAX16822BEVKIT

Design Guides

Automotive (PDF)
Power Management for Battery-Powered Equipment (PDF)

Reliability Reports

Reliability Report: MAX16822A.pdf

Show FIT data for:

Request Reliability Report for:

Software/Models

MAX16822A/B Version Design Tool

Ordering Information

Notes:

Other options and links for purchasing parts are listed at: http://www.maxim-ic.com/sales.
Didn't Find What You Need? Ask our applications engineers. Expert assistance in finding parts, usually within one business day.
Part number suffixes: T or T&R = tape and reel;+ = RoHS/lead-free;# = RoHS/lead-exempt. More: SeeFull Data Sheet or Part Naming Conventions.
* Some packages have variations, listed on the drawing. "PkgCode/Variation" tells which variation the product uses. Note that "+", "#", "-" in the part number suffix describes RoHS status. Package drawings may show a different suffix character.

Devices: 1-4 of 4

MAX16822A Free
Sample Buy Status

Package: TYPE PINS FOOTPRINT

DRAWING CODE/VAR *

Temp RoHS/Lead-Free?
Materials Analysis

MAX16822AASA+

Active SOIC(N);8 pin;31 mm²
Outline Drawing: 21-0041 (PDF)
Land Pattern: 90-0096 (PDF)
Use pkgcode/variation: S8+2*
-40°C to +125°C RoHS/Lead-Free: Lead Free
Materials Analysis

MAX16822AASA+T

Active SOIC(N);8 pin;31 mm²
Outline Drawing: 21-0041 (PDF)
Land Pattern: 90-0096 (PDF)
Use pkgcode/variation: S8+2*
-40°C to +125°C RoHS/Lead-Free: Lead Free
Materials Analysis

MAX16822B Free
Sample Buy Status

Package: TYPE PINS FOOTPRINT

DRAWING CODE/VAR *

Temp RoHS/Lead-Free?
Materials Analysis

MAX16822BASA+

Active SOIC(N);8 pin;31 mm²
Outline Drawing: 21-0041 (PDF)
Land Pattern: 90-0096 (PDF)
Use pkgcode/variation: S8+2*
-40°C to +125°C RoHS/Lead-Free: Lead Free
Materials Analysis

MAX16822BASA+T

Active SOIC(N);8 pin;31 mm²
Outline Drawing: 21-0041 (PDF)
Land Pattern: 90-0096 (PDF)
Use pkgcode/variation: S8+2*
-40°C to +125°C RoHS/Lead-Free: Lead Free
Materials Analysis

More Information

Topmark Coding: MAX16822

New Product Press Release 2008-08-21

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See All High Brightness LED Drivers (26 Products)

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Description
Key Features
Applications/Uses
Key Specifications
Diagram

Data Sheet
Application Notes
Design Guides
Engineering Journals
Reliability Reports
Software/Models
Evaluation Kits

Price and Availability
Samples
Buy Online
Package Information
Lead-Free Information

Related Products
Notes and Comments
Evaluation Kits

Document Ref.: 19-4141; Rev 2; 2009-08-07
This page last modified: 2009-08-07