MAXIM MAX16836

19-4029; Rev 2; 4/09
KIT
ATION
EVALU
E
L
B
A
AVAIL
High-Voltage, 350mA, High-Brightness LED
Driver with PWM Dimming and 5V Regulator
Features
The MAX16836 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 MAX16836 is
adjusted by using an external current-sense resistor in
series with the LEDs. A dimming input allows widerange “pulsed” PWM operation. Wave-shaping circuitry
reduces EMI. The differential current-sense input
increases noise immunity. The MAX16836 is well suited
for applications requiring a high-voltage input and is
able to withstand automotive load-dump events up to
40V. An on-board pass element minimizes external
components while providing ±3.5% output-current
accuracy. Additional features include a 5V regulated
output and short-circuit and thermal protection.
o
o
o
o
o
The MAX16836 is available in a thermally enhanced,
5mm x 5mm, 16-pin TQFN package and in an 8-pin SO
package with exposed pad. The MAX16836 is specified
over the automotive -40°C to +125°C temperature range.
o
Applications
Automotive Interior: Map, Courtesy, and Cluster
Lighting
o
o
o
o
o
o
o
o
o
+6.5V to +40V Operating Range
Adjustable LED Current (35mA to 350mA)
±3.5% LED Current Accuracy
High-Voltage DIM Pin for Dimming Interface
Integrated Pass Element with Low-Dropout
Voltage (0.55V typ)
+5V Regulated Output with 4mA Source
Capability
Parallel Operation for LED Current > 350mA
Differential LED Current Sense
Low Shutdown Supply Current (35µA typ)
Low 200mV Current-Sense Reference Reduces
Power Losses
Wave-Shaped Edges Reduce Radiated EMI During
PWM Dimming
Thermal Shutdown
Output Short-Circuit Protection
Available in Small, Thermally Enhanced,
5mm x 5mm, 16-Pin TQFN Package and in 8-Pin
SO with Exposed Pad Package
-40°C to +125°C Operating Temperature Range
Ordering Information
Automotive Exterior: Tail Lights and CHMSL
Emergency Vehicle Warning Lights
PART
TEMP RANGE
Navigation and Marine Indicators
MAX16836ATE+
General Lighting
MAX16836ASA+
-40°C to +125°C
8 SO-EP*
+Denotes a lead(Pb)-free/RoHS-compliant package.
*EP = Exposed pad.
Signage, Gasoline Canopies, Beacons
-40°C to +125°C
PIN-PACKAGE
Simplified Diagram
Typical Operating Circuit
VDIM
16 TQFN-EP*
+6.5V TO +40V
IN
OUT
0.1µF
1
16
15
14
13
OUT
EN
N.C.
DIM
+5V REG
V5
GND 12
OUT
LEDs
0.1µF
EN
MAX16836
D1
VIN
2
C1
3
IN
4
N.C.
CS+
V5 11
IN
C2
MAX16836
CS- 10
CS+ 9
N.C.
N.C.
N.C.
N.C.
5
6
7
8
RSENSE
RSENSE
PWM DIMMING
DIM
CSGND
________________________________________________________________ Maxim Integrated Products
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.
1
MAX16836
General Description
MAX16836
High-Voltage, 350mA, High-Brightness LED
Driver with PWM Dimming and 5V Regulator
ABSOLUTE MAXIMUM RATINGS
IN to GND ...............................................................-0.3V to +45V
OUT, DIM, and EN to GND ..........................-0.3V to (VIN + 0.3V)
CS+, CS-, V5 to GND ...............................................-0.3V to +6V
OUT Short Circuited to GND Duration
(at VIN = +16V) .........................................................60 minutes
Maximum Current into Any Pin (except IN and OUT) .........±20mA
Continuous Power Dissipation (TA = +70°C)
16-Pin TQFN 5mm x 5mm
(derate 33.3mW/°C above +70°C) ............................2666.7mW
8-Pin SO (derate 23.3mW/°C above +70°C).............1860.5mW
Junction-to-Case Thermal Resistance (θJC)(Note 1)
8-Pin SO ...........................................................................7°C/W
16-Pin TQFN.....................................................................2°C/W
Junction-to-Ambient Thermal Resistance (θJA)(Note 1)
8-Pin SO .........................................................................43°C/W
16-Pin TQFN...................................................................30°C/W
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
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.maxim-ic.com/thermal-tutorial.
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.
ELECTRICAL CHARACTERISTICS
(VIN = VEN = +12V, CV5 = 0.1µF to GND, IV5 = 0, VCS- = 0V, VDIM = +4V, connect RSENSE = 0.58Ω between CS+ and CS-.
TA = -40°C to +125°C, unless otherwise noted. Typical values are at TA = +25°C.) (Note 2)
PARAMETER
SYMBOL
CONDITIONS
Supply Voltage Range
VIN
(Note 3)
Ground Current
IG
ILOAD = 350mA
Shutdown Supply Current
Guaranteed Output Current
ISHDN
IOUT
Output Current Accuracy
Dropout Voltage (Note 4)
∆VDO
Output Current Slew Rate
Short-Circuit Current
MIN
6.5
VEN ≤ 0.6V
RSENSE = 0.55Ω
TYP
UNITS
40.0
V
1.28
3
mA
35
70
µA
350
mA
35mA < IOUT < 350mA
±3.5
IOUT = 350mA (current pulsed),
12V < VIN < 40V
0.55
IOUT = 350mA (current pulsed),
6.5V < VIN < 12V
0.55
%
1.2
V
Current rising, VDIM rising to 4V
7.8
Current falling, VDIM falling to 0.6V
7.8
VIN = 12V, VCS+ = 0V
MAX
1.5
mA/µs
400
500
650
mA
-1.0
-0.2
µA
LOGIC INPUT
EN Input Current
IEN
-2.5
EN Input Voltage High
VIH
2.8
EN Input Voltage Low
VIL
Turn-On Time
tON
VEN rising edge to 90% of OUT
V
110
0.6
V
350
µs
CURRENT SENSE
Regulated RSENSE Voltage
VSENSE
VSENSE = VCS+ - VCS-
CS- Voltage Range
Input Current (CS+)
VCS+ = 220mV
Input Current (CS-)
VCS+ = 220mV
DIM Input Current
DIM Input Voltage High
VIH
DIM Input Voltage Low
VIL
Turn-On Time
tON
Turn-Off Time
tOFF
2
193
200
-0.3
2.7
-50
17.2
-2.5
-1.0
207
mV
+4.1
V
7.0
µA
µA
-0.2
4
µA
V
0.6
V
After VDIM rising to 4V (Note 5)
110
µs
After VDIM falling to 0.6V (Note 5)
70
µs
_______________________________________________________________________________________
High-Voltage, 350mA, High-Brightness LED
Driver with PWM Dimming and 5V Regulator
(VIN = VEN = +12V, CV5 = 0.1µF to GND, IV5 = 0, VCS- = 0V, VDIM = +4V, connect RSENSE = 0.58Ω between CS+ and CS-.
TA = -40°C to +125°C, unless otherwise noted. Typical values are at TA = +25°C.) (Note 2)
PARAMETER
SYMBOL
CONDITIONS
MIN
TYP
MAX
UNITS
THERMAL OVERLOAD
Thermal-Shutdown Temperature
+159
°C
24
°C
Thermal-Shutdown Hysteresis
+5V REGULATOR
Output Voltage Regulation
VV5
(Note 6)
V5 Short-Circuit Current
4.85
5.00
VV5 = 0V (Note 7)
5.20
V
15
mA
Note 2: All devices are 100% production tested at TA = +25°C. Limits over the operating temperature range are guaranteed by
design.
Note 3: Resistors were added from OUT to CS+ to aid with the power dissipation during testing.
Note 4: Dropout is measured as follows:
Connect RO = 27Ω from OUT to CS+. Connect RSENSE = 0.58Ω from CS+ to CS-. Set VIN = +12V (record VOUT as VOUT1).
Reduce VIN until VOUT = 0.97 x VOUT1 (record as VIN2 and VOUT2). ∆VDO = VIN2 - VOUT2.
Note 5: tON time includes the delay and the rise time needed for IOUT to reach 90% of its final value. tOFF time is the time needed
for IOUT to drop below 10%. See the Typical Operating Characteristics. tON and tOFF are tested with 13Ω from OUT to CS+.
Note 6: Current regulation varies with V5 load (see the Typical Operating Characteristics).
Note 7: Thermal shutdown does not function if the output of the 5V reference is shorted to ground.
Typical Operating Characteristics
(VIN = VEN = +12V, TA = +25°C, unless otherwise noted.)
OUTPUT CURRENT
vs. TEMPERATURE
300
250
ILOAD = 200mA
200
150
ILOAD = 100mA
100
50
ILOAD = 35mA
0
0.206
0.204
0.202
MAX16836 toc03
400
350
OUTPUT CURRENT (mA)
350
0.208
MAX16836 toc02
ILOAD = 350mA
(VCS+ - VCS-) (V)
OUTPUT CURRENT (mA)
400
MAX16836 toc01
450
OUTPUT CURRENT
vs. INPUT VOLTAGE
(VCS+ - VCS-)
vs. OUTPUT CURRENT
300
250
200
150
100
0.200
50
0
0.198
-40 -25 -10 5 20 35 50 65 80 95 110 125
20 50 80 110 140 170 200 230 260 290 320 350
TEMPERATURE (°C)
OUTPUT CURRENT (mA)
0
5
10
15
20
25
30
35
40
INPUT VOLTAGE (V)
_______________________________________________________________________________________
3
MAX16836
ELECTRICAL CHARACTERISTICS (continued)
Typical Operating Characteristics (continued)
(VIN = VEN = +12V, TA = +25°C, unless otherwise noted.)
ILOAD = 350mA
0.6
0.5
0.4
0.3
70
VIN = 20V
60
50
40
30
0.2
20
0.1
10
0
VIN = 40V
80
MAX16836 toc06
90
5.2
+5V REGULATOR OUTPUT (V)
0.8
100
MAX16836 toc05
0.9
SHUTDOWN CURRENT (µA)
MAX16836 toc04
1.0
0.7
+5V REGULATOR OUTPUT
vs. TEMPERATURE
SHUTDOWN CURRENT
vs. TEMPERATURE
DROPOUT VOLTAGE
vs. TEMPERATURE
DROPOUT VOLTAGE (V)
5.1
IV5 = 1mA
NO LOAD
5.0
4.9
VIN = 12V
IV5 = 5mA
VIN = 6.5V
4.8
0
-40 -25 -10 5 20 35 50 65 80 95 110 125
-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)
TEMPERATURE (°C)
(VCS+ - VCS-) vs. IV5
+5V REGULATOR OUTPUT vs. VIN
0.202
0.200
ILOAD = 350mA
0.198
MAX16836 toc08
0.204
5.2
+5V REGULATOR OUTPUT (V)
MAX16836 toc07
0.206
(VCS+ - VCS-) (V)
MAX16836
High-Voltage, 350mA, High-Brightness LED
Driver with PWM Dimming and 5V Regulator
5.1
IV5 = 5mA
NO LOAD
5.0
4.9
IV5 = 5mA
0.196
4.8
0
1
2
3
4
5
6
5
IV5 (mA)
10
15
20
25
30
200Hz DIMMED OPERATION
MAX16836 toc10
VDIM
2V/div
0V
100µs/div
4
40
200Hz DIMMED OPERATION (EXPANDED)
MAX16836 toc09
ILOAD = 350mA
VIN = VEN = 12V
DIM PULSED AT
200Hz (5%
DUTY CYCLE)
35
VIN (V)
ILOAD = 350mA
VIN = VEN = 12V
DIM PULSED AT
200Hz (50%
DUTY CYCLE)
VDIM
2V/div
0V
ILOAD
200mA/div
ILOAD
200mA/div
0A
0A
20µs/div
_______________________________________________________________________________________
High-Voltage, 350mA, High-Brightness LED
Driver with PWM Dimming and 5V Regulator
200Hz DIMMED OPERATION (EXPANDED)
ILOAD = 350mA
VDIM
2V/div
0V
ILOAD
200mA/div
204
VSENSE (mV)
ILOAD = 350mA
VIN = VEN = 12V
DIM PULSED AT
200Hz (50%
DUTY CYCLE)
206
MAX16836 toc12
VSENSE vs. VCS-
MAX16836 toc11
0A
202
200
198
20µs/div
0
0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0 4.5 5.0
VCS- (V)
Pin Description
PIN
NAME
FUNCTION
TQFN
SO
1, 16
8
OUT
2, 3
1
IN
4–8, 14
—
N.C.
No Connection. Not internally connected.
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
9
2
CS+
Positive Input of the Internal Differential Amplifier. Connect the current-sense resistor
between CS+ and CS- to program the output current level.
10
3
CS-
Negative Input of the Internal Differential Amplifier. Connect the current-sense resistor
between CS- and CS+ to program the output current level.
11
4
V5
+5V Regulated Output. Connect a 0.1µF capacitor from V5 to GND.
12
5
GND
Ground
13
6
DIM
Pulsed Dimming Input. Drive DIM low to disable the output. Drive DIM high or leave
unconnected to enable the output.
15
7
EN
Enable Input. Drive EN high to enable the output.
—
—
EP
Exposed Pad. Connect to the ground plane for effective power dissipation. Do not use as
the only ground connection.
_______________________________________________________________________________________
5
MAX16836
Typical Operating Characteristics (continued)
(VIN = VEN = +12V, TA = +25°C, unless otherwise noted.)
High-Voltage, 350mA, High-Brightness LED
Driver with PWM Dimming and 5V Regulator
MAX16836
Functional Diagram
V5
IN
DIM
IN
REGULATOR
1µA
IN
EN
ENABLE
REFERENCE
GENERATOR
I_REG
OUT
DIFFERENTIAL
SENSE
AMPLIFIER
MAX16836
CS+
CS-
THERMAL
SHUTDOWN
Detailed Description
The MAX16836 is a high-current regulator capable of
providing up to a total of 350mA of current to one or
more strings of HB LEDs. A wide operating input voltage range of +6.5V to +40V makes the MAX16836
ideal for automotive applications. A +5V regulated output provides up to 4mA of current to power external circuitry. In addition, the MAX16836 features thermal and
output short-circuit protection. The wide operating voltage range helps protect the MAX16836 against large
transients such as those found in load-dump situations
up to 40V.
The MAX16836 uses a feedback loop to control the output 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
power series pass device (see the Functional
Diagram). The regulation point is factory-set at (VCS+ VCS-) = 200mV ±3.5%. The regulated current is user
defined by the value of RSENSE.
The MAX16836 is a current controller internally optimized for driving the impedance range expected from
one or more HB LEDs.
6
+5V Regulator
The MAX16836 includes a fixed +5V output regulator
that delivers up to 4mA of load current throughout the
+6.5V to +40V input voltage range. Connect a 0.1µF
compensation capacitor from V5 to ground. Shorting
V5 to ground disables the thermal shutdown. When EN
is low, V5 is off. V5 stays on during PWM dimming,
using the DIM input.
Thermal Protection
The MAX16836 enters a thermal-shutdown mode in the
event of overheating. This typically occurs in overload or
output short-circuit conditions. If the junction temperature exceeds TJ = +159°C (typ), the internal thermal-protection circuitry turns off the series pass device. The
MAX16836 recovers from thermal-shutdown mode once
the junction temperature drops by 24°C (typ). The part
therefore protects itself by thermally cycling in the event
of a short-circuit or overload condition. Shorting V5 to
ground disables the thermal shutdown.
Applications Information
Programming the LED Current
The MAX16836 uses a sense resistor across CS+ and
CS- to set the LED current. The differential sense amplifier connected across RSENSE provides ground-loop
immunity and low-frequency noise rejection. The LED
current is given by:
ILED = VSENSE/RSENSE
_______________________________________________________________________________________
High-Voltage, 350mA, High-Brightness LED
Driver with PWM Dimming and 5V Regulator
where VFT(MAX) is the total forward voltage of all series
connected LEDs. The minimum operating voltage of the
device is +6.5V. The device operates below +6.5V; however, output current may not meet the full regulation
specification.
Paralleling Multiple MAX16836s
to Drive One High-Power LED
For applications that require more than 350mA of LED
current, two or more MAX16836s can be paralleled
(see Figure 3). VCS- should not exceed 4.1V.
R1
IN
OUT
EN
V5
Low-Frequency PWM Dimming at the Output
The MAX16836 provides pulsed or chopped current
dimming input (DIM). The other method is to connect
DIM to V5 and EN to IN and pulse EN. Both methods
generate a regulated-amplitude PWM current (variable
duty cycle) that can provide control over the LED
brightness (see Figures 1 and 2).
C2
C1
MAX16836
V5
CS+
DIM
CS-
VDIM
GND
1
OUT
2
IN
3
IN
16
15
14
13
OUT
EN
N.C.
DIM
ILED
GND 12
D1
VIN
V5 11
C1
4
C2
MAX16836
RSENSE
CS- 10
VIN
R2
CS+ 9
N.C.
N.C.
N.C.
N.C.
N.C.
5
6
7
8
IN
OUT
EN
V5
C4
C3
Figure 1. Dimming with EN Connected to VIN at a Constant
Voltage and DIM Pulsed
MAX16836
V5
DIM
CS+
LEDs
CS-
VIN
1
OUT
2
IN
3
IN
4
N.C.
16
15
14
13
OUT
EN
N.C.
DIM
GND
ILED
GND 12
D1
V5 11
C1
C2
MAX16836
CS- 10
RSENSE
Figure 3. Paralleling MAX16836s
CS+ 9
N.C.
N.C.
N.C.
N.C.
5
6
7
8
Figure 2. Dimming with DIM Connected to V5, EN Connected
to VIN
_______________________________________________________________________________________
7
MAX16836
Input-Voltage Considerations
For proper operation, the minimum input voltage must
always be:
VIN(MIN) ≥ VSENSE(MAX) + VFT(MAX) + ∆VDO(MAX)
MAX16836
High-Voltage, 350mA, High-Brightness LED
Driver with PWM Dimming and 5V Regulator
Two Brightness Levels for
TAIL/STOP Lights
Figure 4 shows PWM dimming operation for the
MAX16836 with an ICM7555 timer. The ICM7555 provides adjustable duty cycle using two external resistors
and a capacitor. In TAIL operation, the output of the
ICM7555 feeds into DIM and lights up the LEDs. The
LED’s brightness depends on the duty cycle of the
ICM7555. When VSTOP is present, DIM is pulled up to
VSTOP. The PWM dimming operation is disabled and
the LEDs light up to full brightness. See the ICM7555
data sheet for formulas to calculate the dimming frequency and the duty cycle.
LED Current Thermal Foldback
With a minimum number of external components, the
MAX16836 provides LED current thermal foldback
using a negative temperature coefficient (NTC) thermistor. Figure 5 shows a thermistor connected to V5 and
the CS+ of the MAX16836. As the temperature increases, the voltage drop across R2 increases causing the
LED current to decrease.
⎛ R + R2 ⎞
ILED = [VSENSE − [R2 /(R2 + RT)] × V5] × ⎜ T
⎟
⎝ R1RT ⎠
(assuming IRT < < ILED).
D1
STOP
D2
TAIL
IN
OUT
R1
D5
R2
C1
EN
V5
MAX16836
LEDs
C2
D3
D4
IN
DIS
+5V REG
DIM
OUT
CS+
ICM7555
R3
RSENSE
R4*
TH
TRG
GND
CS-
GND
C3
*R4 ≤ 300kΩ
Figure 4. PWM Dimming Operation with ICM7555 Timer
VIN
IN
OUT
EN
V5
LEDs
C2
MAX16836
RT
PWM DIMMING
R2
C1
DIM
CS+
R1
GND
CS-
Figure 5. LED Current Thermal Foldback with an NTC Thermistor
8
_______________________________________________________________________________________
High-Voltage, 350mA, High-Brightness LED
Driver with PWM Dimming and 5V Regulator
Figure 7 shows an application circuit with the
MAX16836 using a single BJT to provide high output
current. For proper operation:
VIN(MIN) > VCESAT(MAX) + VFT(MAX) + VSENSE
where VCESAT(MAX) is the maximum saturation voltage
of the external BJT.
STOP
TAIL
IN
OUT
EN
V5
C2
MAX16836
V5
LEDs
C1
DIM
CS+
R2
R1
Q1
CS-
GND
Figure 6. Two Brightness Level with Current Level Switch for Tail/Stop Lights
LEDs
VIN
IN
OUT
EN
V5
Q1
C2
MAX16836
PWM DIMMING
C1
DIM
CS+
RSENSE
GND
CS-
Figure 7. Increased LED Current (Ampere Range) with a Single BJT
_______________________________________________________________________________________
9
MAX16836
Other Applications
The application circuit in Figure 6 implements a twolevel brightness current for TAIL/STOP lights. In TAIL
operation, Q1 is off and the R1 sets the output current.
In STOP operation, Q1 turns on and the output current
is set by a parallel combination of R1 and R2.
Multichannel HB LED Driver
controller, provides the input power to each LED driver
preregulated voltage to multiple MAX16836 drivers.
Figure 8 shows an array of MAX16836s with independent
DIM control. The MAX5094C, a current-mode PWM
D1
L1
VIN
CREF
REF
C3
VCC
IN
IN
OUT
IN
OUT
OUT
C2
R3
U2
COMP
Q1
OUT
EN
C4
MAX16836
U4
LEDs
MAX5094C
CCOMP
EN
V5
RCOMP
FB
GND
R4
CS
V5
C11
C9
C8
DIM
CS+
DIM
CS+
R5
CT/RT
LEDs
MAX16836
EN
V5
C10
DIM
GND
U3
LEDs
MAX16836
C7
C6
CS+
R7
CS-
GND
R6
CS-
GND
CS-
CT
R2
Figure 8. Multichannel HB LED Driver for LCD Backlight
V5
CS-
CS+
TOP VIEW
GND
Pin Configurations
12
11
10
9
TOP VIEW
DIM 13
8
N.C.
N.C. 14
7
N.C.
6
N.C.
5
N.C.
IN 1
CS+
+
2
3
V5 4
OUT 16
+
8
OUT
7
EN
6
DIM
5
GND
MAX16836
CS-
MAX16836
EN 15
EP*
SO
4
N.C.
3
IN
2
IN
1
OUT
MAX16836
High-Voltage, 350mA, High-Brightness LED
Driver with PWM Dimming and 5V Regulator
*EXPOSED PAD
TQFN
Package Information
Chip Information
PROCESS: BiCMOS
For the latest package outline information and land patterns, go
to www.maxim-ic.com/packages.
PACKAGE TYPE
10
PACKAGE CODE
DOCUMENT NO.
8 SO-EP
S8E-12
21-0111
16 TQFN-EP
T1655-3
21-0140
______________________________________________________________________________________
High-Voltage, 350mA, High-Brightness LED
Driver with PWM Dimming and 5V Regulator
REVISION
NUMBER
REVISION
DATE
0
2/08
Initial release
1
5/08
Updated Ordering Information, Electrical Characteristics, and Package
Information.
1, 2, 11, 12
2
4/09
Added the SO package to the data sheet.
1, 2, 5, 10
DESCRIPTION
PAGES
CHANGED
—
Maxim cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Maxim product. No circuit patent licenses are
implied. Maxim reserves the right to change the circuitry and specifications without notice at any time.
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