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MAX16835ATE+

P1-P3P4-P6P7-P8
General Description
The MAX16835 current regulator operates from a 6.5V
to 40V input voltage range and delivers up to a total of
350mA to one or more strings of high-brightness LEDs
(HB LEDs). The output current of the MAX16835 is
adjusted by using an external current-sense resistor in
series with the LEDs. An enable input allows wide-
range “pulsed” dimming. Wave-shaping circuitry
reduces EMI. The differential current-sense input
increases noise immunity. The MAX16835 is well suited
for applications requiring high-voltage input and is able
to withstand automotive load-dump events up to 40V.
An on-board pass element minimizes external compo-
nents while providing ±3.5% output current accuracy.
Additional features include a 5V regulated output and
short-circuit and thermal protection.
The MAX16835 is available in a thermally enhanced,
5mm x 5mm, 16-pin TQFN package and is specified
over the automotive -40°C to +125°C temperature range.
Applications
Automotive Interior: Map, Courtesy, and Cluster
Lighting
Automotive Exterior: Tail Lights and CHMSL
Warning Lights for Emergency Vehicles
Navigation and Marine Indicators
General Illumination
Signage, Gasoline Canopies, Beacons
Features
o +6.5V to +40V Operating Range
o Adjustable LED Current (35mA to 350mA)
o ±3.5% Output Current Accuracy
o Integrated Pass Element with Low-Dropout
Voltage (0.55V typ)
o Output Short-Circuit Protection
o +5V Regulated Output with 4mA Source
Capability
o Thermal Shutdown
o Differential LED Current Sense
o High-Voltage Enable Pin for Dimming Interface
o Low Shutdown Supply Current (35µA typ)
o Low 200mV Current-Sense Reference Reduces
Power Losses
o Wave-Shaped Edges Reduce Radiated EMI During
PWM Dimming
o Available in Small, Thermally Enhanced,
5mm x 5mm, 16-Pin TQFN Package
o -40°C to +125°C Operating Temperature Range
High-Voltage, 350mA, Adjustable Linear
High-Brightness LED Driver
15
16
14
13
6
5
7
IN
N.C.
8
OUT
V5
CS+
GND
1
+
2
N.C.
4
12 11 9
EN
OUT
N.C.
N.C.
N.C.
N.C.
MAX16835
IN CS-
3
10
N.C.
TQFN
TOP VIEW
Pin Configuration
Ordering Information
MAX16835
IN
OUT
V5
LEDs
R
SENSE
0.1µF
+6.5V TO +40V
+5V REG
CS+
0.1µF
CS-
EN
PWM DIMMING
GND
Simplified Diagram
For pricing, delivery, and ordering information, please contact Maxim Direct
at 1-888-629-4642, or visit Maxim’s website at www.maximintegrated.com.
MAX16835
19-4028; Rev 2; 10/12
+
Denotes a lead(Pb)-free/RoHS-compliant package.
*
EP = Exposed pad.
/V
denotes an automotive qualified part.
PART TEMP RANGE PIN-PACKAGE
MAX16835ATE+ -40°C to +125°C 16 TQFN-EP*
MAX16835ATE/V+ -40°C to +125°C 16 TQFN-EP*
High-Voltage, 350mA, Adjustable Linear
High-Brightness LED Driver
MAX16835
2
Maxim Integrated
ABSOLUTE MAXIMUM RATINGS
ELECTRICAL CHARACTERISTICS
(V
IN
= V
EN
= +12V, C
V5
= 0.1µF to GND, I
V5
= 0, CS- = GND, connect R
SENSE
= 0.58Ω between CS+ and CS-. T
A
= -40°C to
+125°C, unless otherwise noted. Typical values are at T
A
= +25°C.) (Notes 2 and 3)
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.
IN to GND ...............................................................-0.3V to +45V
OUT, EN to GND..........................................-0.3V to (V
IN
+ 0.3V)
CS+, CS-, and V5 to GND ........................................-0.3V to +6V
OUT Short Circuited to GND Duration
(at V
IN
= +16V) ........................................................60 minutes
Maximum Current into Any Pin (except IN and OUT) .........±20mA
Continuous Power Dissipation (T
A
= +70°C)
16-Pin TQFN 5mm x 5mm
(derate 33.3mW/°C above +70°C)...........................2666.7mW
Operating Junction Temperature Range...........-40°C to +125°C
Junction Temperature......................................................+150°C
Storage Temperature Range .............................-65°C to +150°C
Lead Temperature (soldering, 10s) .................................+300°C
PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS
Supply Voltage Range V
IN
(Note 2) 6.5 40.0 V
Ground Current I
G
I
LOAD
= 350mA 1.28 3 mA
Shutdown Supply Current I
SHDN
V
EN
≤ 0.6V 35 70 µA
Guaranteed Output Current I
OUT
R
SENSE
= 0.55Ω 350 mA
Output Current Accuracy 35mA < I
OUT
< 350mA ±3.5 %
I
OUT
= 350mA (current pulsed),
12V < V
IN
< 40V
0.55 1.2 V
Dropout Voltage (Note 4) ∆VDO
I
OUT
= 350mA (current pulsed),
6.5V < V
IN
< 40V
0.55 1.5 V
Current rising 7.8
Output Current Slew Rate
Current falling 7.8
mA/µs
Short-Circuit Current V
IN
= 12V, V
CS+
= 0V 400 500 650 mA
LOGIC INPUT
EN Input Current I
EN
-2.5 -1.0 -0.2 µA
EN Input Voltage High V
IH
2.8 V
EN Input Voltage Low V
IL
0.6 V
Turn-On Time t
ON
V
EN
rising edge to 90% of OUT 110 350 µs
CURRENT SENSE
Regulated R
SENSE
Voltage V
SENSE
V
SENSE
= V
CS+
- V
CS-
193 200 207 mV
Input Current (CS+) V
CS+
= 220mV 2.7 7.0 µA
Input Current (CS-) V
CS+
= 220mV -50 -17.2 µA
Note 1: Package thermal resistances obtained using the method described in JEDEC specification JESD51-7, using a four-layer
board. For detailed information on package thermal considerations, see www.maximintegrated.com/thermal-tutorial
.
PACKAGE THERMAL CHARACTERISTICS (Note 1)
Junction-to-Ambient Thermal Resistance (θ
JA
) ...............30°C/W
Junction-to-Case Thermal Resistance (θ
JC
).........................2°C/W
High-Voltage, 350mA, Adjustable Linear
High-Brightness LED Driver
MAX16835
3
Maxim Integrated
Note 2: Resistors were added from OUT to CS+ to aid with the power dissipation during testing.
Note 3: All devices 100% production tested at T
A
= +25°C. Limits over the operating temperature range are guaranteed by design.
Note 4: Dropout is measured as follows:
Connect R
O
= 27Ω from OUT to CS+. Connect R
SENSE
= 0.58Ω from CS+ to CS-. Set V
IN
= +12V (record V
OUT
as V
OUT1
).
Reduce V
IN
until V
OUT
= 0.97 x V
OUT1
(record as V
IN2
and V
OUT2
). ∆V
DO
= V
IN2
- V
OUT2
.
Note 5: Current regulation varies with V5 load (see the
Typical Operating Characteristics
).
Note 6: Thermal shutdown does not function if the output of the 5V reference is shorted to ground.
ELECTRICAL CHARACTERISTICS (continued)
(V
IN
= V
EN
= +12V, C
V5
= 0.1µF to GND, I
V5
= 0, CS- = GND, connect R
SENSE
= 0.58Ω between CS+ and CS-. T
A
= -40°C to
+125°C, unless otherwise noted. Typical values are at T
A
= +25°C.) (Notes 2 and 3)
PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS
THERMAL OVERLOAD
Thermal-Shutdown Temperature +159 °C
Thermal-Shutdown Hysteresis 24 °C
+5V REGULATOR
Output Voltage V
V5
4.85 5.00 5.20 V
Output Voltage Load Regulation ∆V5 0 < I
LOAD
< 4mA (Note 5) 12 20 mV/mA
V5 Short-Circuit Current V5 = 0V (Note 6) 15 mA
Typical Operating Characteristics
(V
IN
= V
EN
= +12V, T
A
= +25°C, unless otherwise noted.)
OUTPUT CURRENT
vs. TEMPERATURE
MAX16835 toc01
TEMPERATURE (°C)
OUTPUT CURRENT (mA)
1109565 80-10 5 20 35 50-25
50
100
150
200
250
300
350
400
450
0
-40 125
I
LOAD
= 350mA
I
LOAD
= 35mA
I
LOAD
= 200mA
I
LOAD
= 100mA
(V
CS+
- V
CS-
)
vs. OUTPUT CURRENT
MAX16835 toc02
OUTPUT CURRENT (mA)
(V
CS+
- V
CS-
) (V)
320290230 26080 110 140 170 20050
0.200
0.202
0.204
0.206
0.208
0.198
20 350
OUTPUT CURRENT
vs. INPUT VOLTAGE
MAX16835 toc03
INPUT VOLTAGE (V)
OUTPUT CURRENT (mA)
35305 10 15 20 25
50
100
150
200
250
300
350
400
0
040
P1-P3P4-P6P7-P8

MAX16835ATE+

Mfr. #:
Buy MAX16835ATE+
Manufacturer:
Maxim Integrated
Description:
LED Lighting Drivers 350mA Adj Linear HB
Lifecycle:
New from this manufacturer.
Delivery:
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