19-4032; Rev 1; 7/09
KIT
ATION
EVALU
E
BL
AVAILA
High-Voltage, 100mA/200mA Adjustable Linear
High-Brightness LED Drivers with PWM Dimming
General Description
The MAX16815/MAX16828 current regulators operate
from a 6.5V to 40V input voltage range and deliver up
to 100mA (MAX16815) or 200mA (MAX16828) to high-
brightness LED (HB LED) loads. The output current is
adjusted by using an external current-sense resistor in
series with the LEDs. The MAX16815/MAX16828’s dim-
ming input allows wide-range “pulsed” PWM operation.
An on-board pass element minimizes external compo-
nents while providing ±3.5% output-current accuracy.
The MAX16815/MAX16828 are available in a thermally
enhanced, 3mm x 3mm, 6-pin TDFN package with
exposed pad and in an 8-pin SO package with
exposed pad; they are specified over the automotive
-40°C to +125°C temperature range.
o
6.5V to 40V Operating Range
o
Adjustable LED Current
MAX16815: 35mA to 100mA
MAX16828: 35mA to 200mA
o
±3.5% LED Current Accuracy
o
High-Voltage DIM Input for Dimming Interface
o
Integrated Pass Element with Low-Dropout
Voltage (0.4V typ)
o
5V Regulated Output with 4mA Source Capability
o
Thermal Shutdown
o
Output Short-Circuit Protection
o
Available in Small, Thermally Enhanced,
3mm x 3mm, 6-Pin TDFN and 8-Pin SO with
Exposed Pad Packages
o
-40°C to +125°C Operating Temperature Range
Features
MAX16815/MAX16828
Applications
Automotive Interior: Map, Courtesy,
and Cluster Lighting
Automotive Exterior: Rear Combination Lights
(RCLs)
Emergency Vehicle Warning Lights
Signage and Indicators
Ambient and Architectural Lighting
LED Bulbs
Display Backlighting
Pin Configurations appear at end of data sheet.
Ordering Information
PART
MAX16815ATT+
MAX16815ASA+
MAX16828ATT+
MAX16828ASA+
TEMP RANGE
-40°C to +125°C
-40°C to +125°C
-40°C to +125°C
-40°C to +125°C
PIN-PACKAGE
6 TDFN-EP*
8 SO-EP*
6 TDFN-EP*
8 SO-EP*
+Denotes
a lead(Pb)-free/RoHS-compliant package.
*EP
= Exposed pad.
Typical Operating Circuit
+6.5V TO +40V
IN
C1
+5V REG
V5
C2
EN
LEDs
0.1µF
OUT
6.5V TO 40V
IN
Simplified Diagram
OUT
+5V REG
V5
LEDs
0.1µF
MAX16815
MAX16828
MAX16815
MAX16828
CS+
R
SENSE
PWM
DIMMING
DIM
CS-
GND
CS+
PWM DIMMING
DIM
GND
CS-
R
SENSE
________________________________________________________________
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, 100mA/200mA Adjustable Linear
High-Brightness LED Drivers with PWM Dimming
MAX16815/MAX16828
ABSOLUTE MAXIMUM RATINGS
IN to GND ...............................................................-0.3V to +45V
CS+, CS-, V5 to GND ...............................................-0.3V to +6V
DIM, EN to GND...........................................-0.3V to (V
IN
+ 0.3V)
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)
6-Pin, 3mm x 3mm TDFN
(derate 18.2mW/°C above +70°C) ..........................1454.5mW
8-Pin SO (derate 23.3mW/°C above +70°C)...........1860.5mW
Operating Temperature Range .........................-40°C to +125°C
Junction Temperature ......................................................+150°C
Junction-to-Case Thermal Resistance (θ
JC
) (Note 1)
6-Pin, 3mm x 3mm TDFN ...............................................9°C/W
8-Pin SO .........................................................................7°C/W
Junction-to-Ambient Thermal Resistance (θ
JA
) (Note 1)
6-Pin, 3mm x 3mm TDFN .............................................42°C/W
8-Pin SO .......................................................................43°C/W
Storage Temperature Range .............................-60°C to +150°C
Lead Temperature (soldering, 10s) .................................+300°C
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.
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
(V
IN
= 12V, V
EN
= 12V (SO only), C
V5
= 0.1µF to GND, I
V5
= 0, V
DIM
= 4V, V
CS-
= 0V (SO only), connect R
SENSE
= 2Ω (MAX16815)
and R
SENSE
= 1Ω (MAX16828) between CS+ and GND. T
A
= -40°C to +125°C, unless otherwise noted. Typical values are at
T
A
= +25°C.) (Note 2)
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 3)
I
LOAD
= 100mA
I
LOAD
= 200mA
V
EN
≤
0.6V (SO only)
R
SENSE
= 2_ (MAX16815)
R
SENSE
= 1_ (MAX16828)
35mA < I
OUT
< 100mA (MAX16815)
35mA < I
OUT
< 200mA (MAX16828)
I
OUT
= 100mA (current pulsed),
12V < V
IN
< 40V (MAX16815) (Note 4)
I
OUT
= 100mA (current pulsed),
6.5V < V
IN
< 12V (MAX16815) (Note 4)
I
OUT
= 200mA (current pulsed),
12V < V
IN
< 40V (MAX16828) (Note 5)
I
OUT
= 200mA (current pulsed),
6.5V < V
IN
< 12V (MAX16828) (Note 5)
Output Current Slew Rate
Short-Circuit Current
EN INPUT (SO ONLY)
EN Input Current
EN Input Voltage High
EN Input Voltage Low
Current rising
Current falling
V
OUT
= 0V, V
IN
= 12V, MAX16815
V
OUT
= 0V, V
IN
= 12V, MAX16828
I
EN
V
IH
V
IL
130
250
-2.5
2.8
0.6
100
200
±3.5
±3.5
0.1
0.1
0.27
0.27
9.7
9.7
200
300
-1
270
350
-0.2
0.4
0.6
V
0.55
0.7
mA/µs
mA
CONDITIONS
MIN
6.5
0.82
1
35
TYP
MAX
40.0
2
2
70
UNITS
V
mA
µA
mA
%
Dropout Voltage
∆VDO
µA
V
V
2
_______________________________________________________________________________________
High-Voltage, 100mA/200mA Adjustable Linear
High-Brightness LED Drivers with PWM Dimming
ELECTRICAL CHARACTERISTICS (continued)
(V
IN
= 12V, V
EN
= 12V (SO only), C
V5
= 0.1µF to GND, I
V5
= 0, V
DIM
= 4V, V
CS-
= 0V (SO only), connect R
SENSE
= 2Ω (MAX16815)
and R
SENSE
= 1Ω (MAX16828) between CS+ and GND. T
A
= -40°C to +125°C, unless otherwise noted. Typical values are at
T
A
= +25°C.) (Note 2)
PARAMETER
CURRENT SENSE
Regulated R
SENSE
Voltage
CS- Voltage Range
Input Current (CS+)
Input Current (CS-)
DIM Input Current
DIM Input-Voltage High
DIM Input-Voltage Low
Turn-On Time
Turn-Off Time
THERMAL OVERLOAD
Thermal-Shutdown Temperature
Thermal-Shutdown Hysteresis
+5V REGULATOR
Output-Voltage Load Regulation
Output Voltage
V5 Short-Circuit Current
V
V5
∆V
V5
(Note 8)
0 < I
V5
< 4mA
V
V5
= 0 (Note 9)
4.8
5.0
12
15
5.2
20
V
mV/mA
mA
+159
24
°C
°C
V
IH
V
IL
t
ON
t
OFF
After V
DIM
rising to 4V (Note 7)
After V
DIM
falling to 0.6V (Note 7)
V
RSNS
V
RSNS
= V
CS+
for TDFN package;
V
RSNS
= V
CS+
- V
CS-
for SO package
SO only
V
CS+
= 220mV
V
CS+
= 220mV (SO only)
V
DIM
= 0V
-50
-2.5
2.8
0.6
100
55
193
-0.3
2.7
17.2
-1.0
-0.2
200
207
+4.7
7
mV
V
µA
µA
µA
V
V
µs
µs
SYMBOL
CONDITIONS
MIN
TYP
MAX
UNITS
MAX16815/MAX16828
Note 2:
All devices are 100% production tested at T
A
= +25°C. Limits over the operating temperature range are guaranteed by
design.
Note 3:
Resistors were added from OUT to CS+ to aid with power dissipation.
Note 4:
Dropout is measured as follows:
Connect R
O
from OUT to CS+. Connect R
SENSE
= 2Ω (MAX16815) from CS+ to GND (for TDFN) or from CS+ to CS- (for
SO). Set V
IN
= 12V (record V
OUT1
= V
OUT
). For V
IN
= 40V, use R
O
= 360Ω; for V
IN
= 6.5V, use R
O
= 56Ω.
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:
Dropout is measured as follows:
Connect R
O
from OUT to CS+. Connect R
SENSE
= 1Ω (MAX16828) from CS+ to GND (for TDFN) or from CS+ to CS- (for
SO). Set V
IN
= 12V (record V
OUT1
= V
OUT
). For V
IN
= 40V, use R
O
= 180Ω; for V
IN
= 6.5V, use R
O
= 27Ω.
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 6:
I
V5
= 0mA.
Note 7:
t
ON
time includes the delay and the rise time needed for I
OUT
to reach 90% of its final value. t
OFF
time is the time needed for
I
OUT
to drop below 10%. See the
Typical Operating Characteristics.
t
ON
and t
OFF
are tested with 100Ω (MAX16815) or 51Ω
(MAX16828) from OUT to CS+.
Note 8:
Current regulation varies with V5 load (see the
Typical Operating Characteristics).
Note 9:
Thermal shutdown does not function if V5 is shorted to ground.
_______________________________________________________________________________________
3
High-Voltage, 100mA/200mA Adjustable Linear
High-Brightness LED Drivers with PWM Dimming
MAX16815/MAX16828
Typical Operating Characteristics
(V
IN
= 12V, T
A
= +25°C, unless otherwise noted.)
OUTPUT CURRENT
vs. TEMPERATURE
MAX16815 toc01
V
CS
+ (FOR TDFN) OR V
CS+
- V
CS-
(FOR SO)
vs. OUTPUT CURRENT
MAX16815 toc02
OUTPUT CURRENT
vs. INPUT VOLTAGE
350
OUTPUT CURRENT (mA)
300
250
200
150
100
50
MAX16815
MAX16828
MAX16815 toc03
V
CS
+ (FOR TDFN) OR V
CS+
- V
CS-
(FOR SO) (V)
300
250
OUTPUT CURRENT (mA)
200
150
100
MAX16815 AND MAX16828 I
LOAD
= 35mA
50
0
MAX16815 I
LOAD
= 100mA
MAX16828 I
LOAD
= 200mA
0.4
MAX16815 AND MAX16828
I
OUT
UP TO 100mA FOR MAX16828
400
0.3
0.2
0.1
0
-40 -25 -10 5 20 35 50 65 80 95 110 125
TEMPERATURE (°C)
35 40 45 50 55 60 65 70 75 80 85 90 95 100
OUTPUT CURRENT (mA)
0
5
10
15
20
25
30
35
40
INPUT VOLTAGE (V)
DROPOUT VOLTAGE
vs. TEMPERATURE
MAX16815 toc04
+5V REGULATOR OUTPUT
vs. TEMPERATURE
MAX16815 toc05
V
CS
+ (FOR TDFN) OR V
CS+
- V
CS-
(FOR SO)
vs. I
V5
V
CS
+ (FOR TDFN) OR V
CS+
- V
CS-
(FOR SO) (V)
MAX16815 AND MAX16828
MAX16815 toc06
0.5
5.2
MAX16815 AND MAX16828
0.4
5V REGULATOR OUTPUT (V)
0.4
DROPOUT VOLTAGE (V)
MAX16828 I
LOAD
= 200mA
5.1
NO LOAD
I
V5
= 1mA
5.0
0.3
0.3
0.2
0.2
0.1
MAX16815 I
LOAD
= 100mA
0
-40 -25 -10 5 20 35 50 65 80 95 110 125
TEMPERATURE (°C)
4.9
I
V5
= 5mA
4.8
-40 -25 -10 5 20 35 50 65 80 95 110 125
TEMPERATURE (°C)
0.1
0
0
1
2
3
4
+5V REGULATOR OUTPUT vs. V
IN
MAX16815 AND MAX16828
MAX16815 toc07
MAX16815 200Hz DIMMED OPERATION
MAX16815 toc08
MAX16815 200Hz DIMMED OPERATION
(EXPANDED)
MAX16815 toc09
5.2
5V REGULATOR OUTPUT (V)
I
LOAD
= 100mA, V
IN
= 12V
DIM PULSED AT 200Hz
150% DUTY CYCLE
5.1
I
V5
= 1mA
5.0
NO LOAD
V
DIM
10V/div
0V
I
LOAD
= 100mA, V
IN
= 12V
DIM PULSED AT 200Hz
150% DUTY CYCLE
V
DIM
10V/div
0V
I
LOAD
50mA/div
4.9
I
V5
= 5mA
0
I
LOAD
50mA/div
0
4.8
5
10
15
20
25
30
35
40
1ms/div
10µs/div
V
IN
(V)
4
_______________________________________________________________________________________
High-Voltage, 100mA/200mA Adjustable Linear
High-Brightness LED Drivers with PWM Dimming
Typical Operating Characteristics (continued)
(V
IN
= 12V, T
A
= +25°C, unless otherwise noted.)
MAX16815 200Hz DIMMED OPERATION
(EXPANDED)
MAX16815 toc10
MAX16815/MAX16828
MAX16828 200Hz DIMMED OPERATION
MAX16815 toc11
I
LOAD
= 100mA, V
IN
= 12V
DIM PULSED AT 200Hz
50% DUTY CYCLE
V
DIM
10V/div
0V
I
LOAD
= 200mA, V
IN
= 12V
DIM PULSED AT 200Hz
50% DUTY CYCLE
V
DIM
10V/div
0V
I
LOAD
50mA/div
0
I
LOAD
200mA/div
0
20µs/div
1ms/div
MAX16828 200Hz DIMMED OPERATION
(EXPANDED)
MAX16815 toc12
MAX16828 200Hz DIMMED OPERATION
(EXPANDED)
MAX16815 toc13
I
LOAD
= 200mA, V
IN
= 12V
DIM PULSED AT 200Hz
50% DUTY CYCLE
V
DIM
10V/div
0V
I
LOAD
200mA/div
0
I
LOAD
= 200mA, V
IN
= 12V
DIM PULSED AT 200Hz
50% DUTY CYCLE
V
DIM
10V/div
0V
I
LOAD
200mA/div
0
20µs/div
20µs/div
_______________________________________________________________________________________
5
微控制器 MCU
