19-4746; Rev 4; 4/11
TION KIT
EVALUA BLE
AVAILA
High-Voltage, Linear High-Brightness LED
Driver with Open-LED Fault Detect
General Description
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 sink-
ing up to 100mA. The MAX16839 is well suited for auto-
motive 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 on-board pass element minimizes external compo-
nent 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 bright-
ness in LED strings.
Additional features include thermal and open-LED
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
protection also features fault memory, to avoid LED flash-
ing 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 -40NC to +125NC automotive temperature range.
S
5V to 40V Operating Range
S
Integrated 2I Open-Drain Pass Transistor
S
15mA to 100mA Programmable LED Current
S
PWM Dimming
S
Open-LED Fault Detection
S
Open-LED Fault Event Status Memory
S
LED Open-Fault Detect Latches Off Multiple LED
Features
MAX16839
Strings
S
Multichip Synchronized LED Current Sink
S
±5% LED Current Accuracy
S
-40NC to +125NC Operating Temperature Range
S
Thermal Protection
S
Undervoltage Lockout
S
6-Pin TDFN-EP and 8-Pin SO-EP Packages
Ordering Information
PART
MAX16839ATT+
MAX16839ASA+
MAX16839ATT/V+
TEMP RANGE
-40NC to +125NC
-40NC to +125NC
PIN-PACKAGE
6 TDFN-EP*
8 SO-EP*
6 TDFN-EP*
-40NC to +125NC
+Denotes
a lead(Pb)-free/RoHS-compliant package.
*EP
= Exposed pad.
/V denotes an automotive qualified part.
Applications
Automotive Exterior: Turn Signal Light, Brake
Light, Tail and Marker Lights
Automotive Interior: Cluster and Warning Lights,
Dome and Map Lights
Truck, Train, Airplane, and Emergency Car LED
Lighting
General Lighting: Signage, LED Lamps
V
BAT
Typical Application Circuit
V
IN
= 5V TO 40V
REVERSE
PROTECTION DIODE
I
LED
= 100mA
C
IN
= 0.01FF
LEDs
IN
DIM
SINK
MAX16839
FLTS
C
FLTS
= 0.1FF
GND
CS
R
CS
= 2I
Pin Configurations appear at end of data sheet.
_______________________________________________________________
Maxim Integrated Products
1
For pricing, delivery, and ordering information, please contact Maxim Direct at 1-888-629-4642,
or visit Maxim’s website at www.maxim-ic.com.
High-Voltage, Linear High-Brightness LED
Driver with Open-LED Fault Detect
MAX16839
ABSOLUTE MAXIMUM RATINGS
(Voltages are specified with respect to GND.)
IN, SINK.................................................................-0.3V to +45V
FLTS ......................................................................-0.3V to +18V
DIM ..........................................................................-0.3V to +6V
CS .........................................................................-0.3V to +0.5V
Continuous Current into SINK and CS .............................120mA
Continuous Power Dissipation (T
A
= +70NC)
6-Pin TDFN (derate 23.8mW/NC above +70NC) .....1904.8mW
8-Pin SO (derate 18.9mW/NC above +70NC)..........1509.4mW
Operating Temperature Range ........................ -40NC to +125NC
Junction Temperature .....................................................+150NC
Storage Temperature Range............................ -65NC to +150NC
Lead Temperature (soldering, 10s) ................................+300NC
Soldering Temperature (reflow) ......................................+260NC
Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only, and functional
operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to absolute
maximum rating conditions for extended periods may affect device reliability.
PACKAGE THERMAL CHARACTERISTICS (Note 1)
TDFN
Junction-to-Ambient Thermal Resistance (B
JA
) ..........42NC/W
Junction-to-Case Thermal Resistance (B
JC
) ..................... 9NC/W
SO
Junction-to-Ambient Thermal Resistance (B
JA
) ..........53NC/W
Junction-to-Case Thermal Resistance (B
JC
) .................5NC/W
Note 1:
Package thermal resistances were obtained using the method described in JEDEC specification JESD51-7, using a four-layer
board. For detailed information on package thermal considerations, refer to
www.maxim-ic.com/thermal-tutorial.
ELECTRICAL CHARACTERISTICS
(V
IN
= 12V, V
FLTS
= 0V, R
CS
= 4.07I, V
GND
= 0V, DIM = unconnected, C
IN
= 0.1FF (Note 2), T
J
= T
A
= -40NC to +125NC, unless
otherwise noted. Typical values are at T
A
= +25NC.) (Note 3)
PARAMETER
Supply Voltage Range
Quiescent Current
Undervoltage Lockout
UVLO Hysteresis
CS REGULATOR
T
A
= +25NC
CS Voltage Accuracy
CS Load Regulation
Internal Switch On-Resistance
R
DS_ON
LED CURRENT TRANSIENT RESPONSE
LED Current Turn-On Delay
LED Current Turn-On Delay
Relative to DIM
LED Current Turn-Off Delay
Relative to DIM
LED Current Rise Time
LED Current Fall Time
t
r
t
f
t
DIN
t
DDIN
30% of V
IN
rising edge to 50% of I
SINK
,
V
DIM
= 2.1V (Notes 6, 7)
V
DIM
rising edge to 50% of I
SINK
V
DIM
falling edge to 50% of I
SINK
10% of I
SINK
to 90% of I
SINK
90% of I
SINK
to 10% of I
SINK
4
2.3
1.3
2.5
2.5
9
5.5
3.5
5.5
6
Fs
Fs
Fs
Fs
Fs
V
CS
-40NC
P
T
A
P
+125NC, 0.9V
P
V
SINK
P
5.5V
(Note 4)
20mA
P
I
SINK
P
100mA
(Note 5)
195.5
193
40
2
4
203
210.5
213
mV
FV/mA
I
SYMBOL
V
IN
I
IN
V
UVLO
V
IN
rising
CONDITIONS
MIN
5
0.25
3.6
0.3
TYP
MAX
40
0.6
UNITS
V
mA
V
V
2
______________________________________________________________________________________
High-Voltage, Linear High-Brightness LED
Driver with Open-LED Fault Detect
ELECTRICAL CHARACTERISTICS (continued)
(V
IN
= 12V, V
FLTS
= 0V, R
CS
= 4.07I, V
GND
= 0V, DIM = unconnected, C
IN
= 0.1FF (Note 2), T
J
= T
A
= -40NC to +125NC, unless
otherwise noted. Typical values are at T
A
= +25NC.) (Note 3)
PARAMETER
FAULT EVENT STATUS MEMORY
FLTS Activation Threshold
FLTS Activation Hysteresis
LED Open Threshold
LED Open Blanking
Fault Voltage
FLTS Charge Current
FLTS Discharge Current
FLTS Threshold To Turn Off LED
Current Sink
DIM LOGIC
Input High Voltage
Input Low Voltage
DIM Voltage Logic Hysteresis
DIM Pullup Current
DIM Pulldown Current
DIM Pulse Width
DIM Frequency
LEAKAGE CURRENTS
SINK Leakage Current
FLTS Leakage Current
THERMAL SHUTDOWN
Thermal Shutdown Temperature
Thermal Shutdown Hysteresis
Note
Note
Note
Note
Note
2:
3:
4:
5:
6:
Temperature rising
160
15
NC
NC
V
SINK
= 40V, V
DIM
= 0V
V
FLTS
= 8V, V
IN
= 0V
1
1
FA
FA
f
DIM
V
FLTH
V
IH
V
IL
V
DIM_HYS
V
DIM
= 0V
V
DIM
= 0.8V, V
IN
= 2.4V
10
0.385
70
10
0.15
30
1
60
1.5
V
CSO
T
B
V
FLTS
I
CFLTS
V
IN
= 40V, V
CS
= 0V, C
FLTS
= 0.1FF
V
CS
P
25mV
V
FLTS
= 0.5V
25
14
12
0.65
2.25
0.95
2.1
0.8
V
INTH
V
IN
rising, V
CS
= 0V
7
7.38
20
30
25
15
2.8
5
1.3
35
50
18
4.8
7.25
1.65
7.75
V
mV
mV
Fs
V
mA
FA
V
V
V
V
FA
mA
Fs
kHz
SYMBOL
CONDITIONS
MIN
TYP
MAX
UNITS
MAX16839
A 51I resistor is connected between SINK and a 6.5V supply to reduce power dissipation during the factory test.
All devices are 100% production tested at T
A
= +25NC. Limits over temperature are guaranteed by design.
Guaranteed by design and not production tested.
Internal switch resistance is measured with I
SINK
= 0.95 x I
SINK0
(I
SINK0 is
I
SINK
at V
SINK
= 0.9V).
Supply turn-on delay will be measured by rising supply in 6Fs from GND to 12V, and measurement starts when V
IN
= 4V
(typical UVLO).
Note 7:
DIM is kept high to avoid delay due to high capacitance from test setup. In applications, a 30FA pullup current charges
parasitic capacitance at DIM with negligible delay. Ensure that unnecessary capacitance is not added at DIM during the
PCB layout.
_______________________________________________________________________________________
3
High-Voltage, Linear High-Brightness LED
Driver with Open-LED Fault Detect
MAX16839
Typical Operating Characteristics
(V
IN
= 12V, R
CS
= 4.07I from CS to GND, C
FLTS
= 0.1FF, C
IN
= 0.1FF, DIM input unconnected, T
A
= +25NC, unless otherwise noted.
Typical values are at T
A
= +25NC.)
OUTPUT CURRENT vs. TEMPERATURE
MAX16839 toc01a
OUTPUT CURRENT vs. TEMPERATURE
MAX16839 toc01b
OUTPUT CURRENT vs. TEMPERATURE
98.8
98.6
OUTPUT CURRENT (mA)
98.4
98.2
98.0
97.8
97.6
97.4
97.2
97.0
I
LOAD
= 100mA
MAX16839 toc01c
MAX16839 toc04
17.0
16.9
16.8
OUTPUT CURRENT (mA)
16.7
16.6
16.5
16.4
16.3
16.2
16.1
16.0
I
LOAD
= 16mA
50.0
49.9
49.8
OUTPUT CURRENT (mA)
49.7
49.6
49.5
49.4
49.3
49.2
49.1
49.0
I
LOAD
= 50mA
99.0
-40 -25 -10 5 20 35 50 65 80 95 110 125
TEMPERATURE (NC)
-40 -25 -10 5 20 35 50 65 80 95 110 125
TEMPERATURE (NC)
-40 -25 -10 5 20 35 50 65 80 95 110 125
TEMPERATURE (NC)
V
CS
vs. OUTPUT CURRENT
MAX16839 toc02
OUTPUT CURRENT vs. INPUT VOLTAGE
MAX16839 toc03
R
DS(ON)
VS. TEMPERATURE
3.0
2.8
2.6
2.4
R
DS(ON)
(I)
2.2
2.0
1.8
1.6
1.4
1.2
1.0
V
IN
= 12V
205.0
204.5
204.0
203.5
V
CS
(mV)
203.0
202.5
202.0
201.5
201.0
200.5
200.0
10
20
30
40
50
60
70
V
IN
= 12V
120
I
ILED
= 100mA
100
OUTPUT CURRENT (mA)
80
60
40
20
0
I
ILED
= 15mA
I
ILED
= 50mA
80
90 100
5
10
15
20
25
30
35
40
-40 -25 -10 5 20 35 50 65 80 95 110 125
TEMPERATURE (NC)
OUTPUT CURRENT (mA)
V
IN
(V)
QUIESCENT CURRENT
vs. TEMPERATURE
375
QUIESCENT CURRENT (FA)
350
325
300
275
250
225
200
-40 -25 -10 5 20 35 50 65 80 95 110 125
TEMPERATURE (NC)
V
IN
= 12V
MAX16839 toc05
LED CURRENT RISE TIME
MAX16839 toc06
LED CURRENT FALL TIME
MAX16839 toc07
400
V
DIM
2V/div
0V
V
DIM
2V/div
0V
LED CURRENT
50mA/div
0
2Fs/div
2Fs/div
LED CURRENT
50mA/div
0
4
______________________________________________________________________________________
High-Voltage, Linear High-Brightness LED
Driver with Open-LED Fault Detect
Typical Operating Characteristics (continued)
(V
IN
= 12V, R
CS
= 4.07I from CS to GND, C
FLTS
= 0.1FF, C
IN
= 0.1FF, DIM input unconnected, T
A
= +25NC, unless otherwise noted.
Typical values are at T
A
= +25NC.)
LED CURRENT RISE/FALL TIMES
MAX16839 toc08
MAX16839
FLTS DISCHARGE
MAX16839 toc09
LEAKAGE CURRENT vs. TEMPERATURE
V
IN
5V/div
LEAKAGE CURRENT (nA)
0V
V
IN
= 0V
V
FLTS
= 8V
MAX16839 toc10
50
40
30
20
10
0
-10
V
DIM
2V/div
0V
V
IN
IS TURNED OFF
I
LED
50mA/div
0
20Fs/div
1s/div
V
FLTS
5V/div
0V
-40 -25 -10 5 20 35 50 65 80 95 110 125
TEMPERATURE (NC)
FAULT ACTIVATION THRESHOLD
vs. TEMPERATURE
FAULT ACTIVATION THRESHOLD (V)
I
LED
RESPONSE TO SUPPLY CHOPPING
MAX16839 toc11
7.40
7.39
7.38
7.37
7.36
7.35
7.34
7.33
7.32
7.31
7.30
MAX16839 toc12
V
IN
5V/div
I
LED
20mA/div
0
-40 -25 -10 5 20 35 50 65 80 95 110 125
TEMPERATURE (NC)
4ms/div
LED RISE TIME DELAY
(SUPPLY CHOPPING)
MAX16839 toc13
FAULT ACTIVATION THRESHOLD
AND OPEN-LED BLANKING
MAX16839 toc14
V
IN
5V/div
0V
I
LED
20mA/div
0
1Fs/div
20Fs/div
V
IN
2V/div
V
FLTS
2V/div
0V
_______________________________________________________________________________________
5
Embedded System
京公网安备 11010802033920号
EEWORLD
