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
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)
Junction-to-Ambient Thermal Resistance (θ
JA
) ...............30°C/W
Junction-to-Case Thermal Resistance (θ
JC
).........................2°C/W
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.
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)
PARAMETER
Supply Voltage Range
Ground Current
Shutdown Supply Current
Guaranteed Output Current
Output Current Accuracy
SYMBOL
V
IN
I
G
I
SHDN
I
OUT
(Note 2)
I
LOAD
= 350mA
V
EN
≤
0.6V
R
SENSE
= 0.55Ω
35mA < I
OUT
< 350mA
I
OUT
= 350mA (current pulsed),
12V < V
IN
< 40V
I
OUT
= 350mA (current pulsed),
6.5V < V
IN
< 40V
Current rising
Current falling
V
IN
= 12V, V
CS+
= 0V
I
EN
V
IH
V
IL
t
ON
V
SENSE
V
EN
rising edge to 90% of OUT
V
SENSE
= V
CS+
- V
CS-
V
CS+
= 220mV
V
CS+
= 220mV
-50
193
110
200
2.7
-17.2
400
-2.5
2.8
0.6
350
207
7.0
350
±3.5
0.55
0.55
7.8
7.8
500
-1.0
650
-0.2
1.2
1.5
CONDITIONS
MIN
6.5
1.28
35
TYP
MAX
40.0
3
70
UNITS
V
mA
µA
mA
%
V
V
mA/µs
mA
µA
V
V
µs
mV
µA
µA
Dropout Voltage (Note 4)
∆VDO
Output Current Slew Rate
Short-Circuit Current
LOGIC INPUT
EN Input Current
EN Input Voltage High
EN Input Voltage Low
Turn-On Time
CURRENT SENSE
Regulated R
SENSE
Voltage
Input Current (CS+)
Input Current (CS-)
2
Maxim Integrated
MAX16835
High-Voltage, 350mA, Adjustable Linear
High-Brightness LED Driver
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
THERMAL OVERLOAD
Thermal-Shutdown Temperature
Thermal-Shutdown Hysteresis
+5V REGULATOR
Output Voltage
Output Voltage Load Regulation
V5 Short-Circuit Current
V
V5
∆V5
0 < I
LOAD
< 4mA (Note 5)
V5 = 0V (Note 6)
4.85
5.00
12
15
5.20
20
V
mV/mA
mA
+159
24
°C
°C
SYMBOL
CONDITIONS
MIN
TYP
MAX
UNITS
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.
Typical Operating Characteristics
(V
IN
= V
EN
= +12V, T
A
= +25°C, unless otherwise noted.)
OUTPUT CURRENT
vs. TEMPERATURE
MAX16835 toc01
(V
CS+
- V
CS-
)
vs. OUTPUT CURRENT
MAX16835 toc02
OUTPUT CURRENT
vs. INPUT VOLTAGE
350
OUTPUT CURRENT (mA)
300
250
200
150
100
50
MAX16835 toc03
450
400
OUTPUT CURRENT (mA)
350
300
250
200
150
100
50
0
I
LOAD
= 35mA
I
LOAD
= 100mA
I
LOAD
= 200mA
I
LOAD
= 350mA
0.208
400
0.206
(V
CS+
- V
CS-
) (V)
0.204
0.202
0.200
0.198
-40 -25 -10 5 20 35 50 65 80 95 110 125
TEMPERATURE (°C)
20 50 80 110 140 170 200 230 260 290 320 350
OUTPUT CURRENT (mA)
0
0
5
10
15
20
25
30
35
40
INPUT VOLTAGE (V)
Maxim Integrated
3
MAX16835
High-Voltage, 350mA, Adjustable Linear
High-Brightness LED Driver
Typical Operating Characteristics (continued)
(V
IN
= V
EN
= +12V, T
A
= +25°C, unless otherwise noted.)
DROPOUT VOLTAGE
vs. TEMPERATURE
MAX16835 toc04
SHUTDOWN CURRENT
vs. TEMPERATURE
MAX16835 toc05
+5V REGULATOR OUTPUT
vs. TEMPERATURE
MAX16835 toc06
1.0
0.9
0.8
DROPOUT VOLTAGE (V)
100
90
SHUTDOWN CURRENT (µA)
80
70
60
50
40
30
20
10
0
V
IN
= 12V
V
IN
= 6.5V
V
IN
= 20V
V
IN
= 40V
5.2
+5V REGULATOR OUTPUT (V)
5.1
I
V5
= 1mA
5.0
NO LOAD
0.7
0.6
0.5
0.4
0.3
0.2
0.1
0
I
LOAD
= 350mA
4.9
I
V5
= 5mA
4.8
-40 -25 -10 5 20 35 50 65 80 95 110 125
TEMPERATURE (°C)
-40 -25 -10 5 20 35 50 65 80 95 110 125
-40 -25 -10 5 20 35 50 65 80 95 110 125
TEMPERATURE (°C)
TEMPERATURE (°C)
(V
CS+
- V
CS-
) vs. I
V5
MAX16835 toc07
+5V REGULATOR OUTPUT vs. V
IN
MAX16835 toc08
200Hz DIMMED OPERATION
MAX16835 toc09
0.206
5.2
+5V REGULATOR OUTPUT (V)
0.204
(V
CS+
- V
CS-
) (V)
5.1
NO LOAD
5.0
I
V5
= 5mA
V
IN
5V/div
0V
0.202
0.200
I
LOAD
= 350mA
I
LOAD
200mA/div
4.9
I
V5
= 5mA
I
LOAD
= 350mA, V
IN
= V
EN
,
V
IN
PULSED AT 200Hz (50% DUTY CYCLE)
30
35
40
1ms/div
0
0.198
0.196
0
1
2
I
V5
(mA)
3
4
5
4.8
5
10
15
20
25
V
IN
(V)
200Hz DIMMED OPERATION EXPANDED
MAX16835 toc10
200Hz DIMMED OPERATION EXPANDED
MAX16835 toc11
200Hz DIMMED OPERATION
MAX16835 toc12
V
IN
5V/div
0V
I
LOAD
= 350mA
V
IN
= V
EN
V
IN
PULSED AT 200Hz
(50% DUTY CYCLE)
I
LOAD
200mA/div
0
I
LOAD
= 350mA
V
IN
= V
EN
V
IN
PULSED AT 200Hz
(50% DUTY CYCLE)
V
IN
5V/div
0V
I
LED
200mA/div
0
I
LOAD
= 350mA, V
IN
= 12V,
EN PULSED AT 200Hz (50% DUTY CYCLE)
EN
10V/div
0V
I
LED
200mA/div
0
20µs/div
4µs/div
1ms/div
4
Maxim Integrated
MAX16835
High-Voltage, 350mA, Adjustable Linear
High-Brightness LED Driver
Pin Description
PIN
1, 16
2, 3
4–8, 13, 14
9
10
11
12
15
—
NAME
OUT
IN
N.C.
CS+
CS-
V5
GND
EN
EP
FUNCTION
Current-Regulated Output. Connect pin 1 to pin 16.
Positive Input Supply. Bypass IN with a 0.1µF (min) capacitor to GND. Connect pin 2 to pin 3.
No Connection. Not internally connected.
Positive Input of the Internal Differential Amplifier. Connect the current-sense resistor between CS+
and CS- to program the output current level.
Negative Input of the Internal Differential Amplifier. Connect the current-sense resistor between
CS- and CS+ to program the output current level.
+5V Regulated Output. Connect a 0.1µF capacitor from V5 to GND.
Ground
Enable Input. Drive EN high to enable the output.
Exposed Pad. Connect to the ground plane for effective power dissipation. Do not use as the only
ground connection.
Functional Diagram
IN
V5
REGULATOR
IN
EN
ENABLE
REFERENCE
GENERATOR
I
-REG
OUT
MAX16835
DIFFERENTIAL
SENSE
AMPLIFIER
THERMAL
SHUTDOWN
CS+
CS-
Detailed Description
The MAX16835 is a high-current regulator capable of
providing up to a total of 350mA of current to one or
more strings of high-brightness LEDs. A wide operating
input voltage range of +6.5V to +40V makes the
MAX16835 ideal for automotive applications. A +5V
regulated output provides up to 4mA of current to
power external circuitry. In addition, the MAX16835
Maxim Integrated
features thermal and output short-circuit protection.
The wide operating voltage range helps protect the
MAX16835 against large transients such as those
found in load-dump situations up to 40V.
The MAX16835 uses a feedback loop to control the out-
put current. The differential voltage across the sense
resistor is compared to a fixed reference voltage, and
the error is amplified to serve as the drive to the internal
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