The MAX16839 programmable current regulator operates from a 5V to 40V input voltage range and features an open-drain, constant-current sink output capable of sinking up to 100mA. The MAX16839 is well suited for automotive applications and other applications that require a general-purpose linear LED driver. The device directly withstands automotive load dump events of up to 45V.
An onboard pass element minimizes external component count while providing Q5% output current accuracy. The MAX16839 includes a dimming input that controls the duty cycle of the output current, allowing a wide LED dimming range. In addition, the dimming input functions as an on/off control of the output current. In multiple LED string applications, the dimming input synchronizes the LED current-sink turn-on, ensuring simultaneous brightness in LED strings.
Additional features include thermal protection and an open-LED fault-detection output. In multiple LED string applications where all FLTS pins are connected together, an open-LED detection in one LED string turns off all the strings simultaneously. Open-LED detection also features fault memory, to avoid LED flashing during subsequent power-up cycles.
The MAX16839 is available in thermally enhanced, 6-pin TDFN-EP and 8-pin SO-EP packages and is specified over the -40°C to +125°C automotive temperature range.
Key Features
Applications/Uses
5V to 40V Operating Range
Integrated 2Ω Open-Drain Pass Transistor
15mA to 100mA Programmable LED Current
PWM Dimming
Open-LED Fault Detection
Open-LED Fault Event Status Memory
LED Open-Fault Detect Latches Off Multiple LED Strings
Multichip Synchronized LED Current Sink
±5% LED Current Accuracy
-40°C to +125°C Operating Temperature Range
Thermal Protection
Undervoltage Lockout
6-Pin TDFN-EP and 8-Pin SO-EP Packages
Automotive Exterior: Turn Signal Light, Brake Light, Tail and Marker Lights
Automotive Interior: Cluster and Warning Lights, Dome and Map Lights
General Lighting: Signage, LED Lamps
Truck, Train, Airplane, and Emergency Car LED Lighting
