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High-Voltage, Linear High-Brightness LED
Driver with Open-LED Fault Detect
Detailed Descrip tion
The MAX16839 programmable current regulator oper-
ates 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 directly withstands
automotive load-dump events of up to 45V.
A single resistor-programmable output current and on-
board pass element minimize the number of external
components while providing Q 5% output current accuracy.
The MAX16839 includes a dimming input that controls
the duty cycle of the output current, allowing a wide
LED dimming range to be implemented. 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 detection output that can turn off multiple LED
strings simultaneously. See Figure 1.
Open-LED Detection and
Fault Event Status Memory
The MAX16839 has an integrated open-LED detection
that reduces external components required to implement
this function. The following conditions enable the open-
LED detection feature:
U FLTS not connected to ground
U V IN > V INTH (7.38V) (typ)
U Thermal shutdown inactive
U V DIM = High
IN
5V REG
SINK
5V
I REG
DIM
30μA
REFERENCE
GENERATOR
CS
IN
15V CLAMP
1mA
ENABLE
MAX16839
1.65V
OPEN-LED
2.8mA
THERMAL
SHDN
FAULT
DETECT
FLTS
GND
Figure 1. Internal Block Diagram
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