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MAX16804ATP+

P1-P3P4-P6P7-P9P10-P10
General Description
The MAX16804 current regulator operates from a 5.5V to
40V input voltage range and delivers 35mA to 350mA to
one or more strings of high-brightness LEDs (HB LEDs).
The output current of the MAX16804 is set by using an
external current-sense resistor in series with the LEDs. A
dual-mode DIM pin and on-board 200Hz ramp generator
allow PWM dimming with an analog or PWM input signal.
The analog control signal at dimming input DIM allows for
a theater-dimming effect to be implemented. Fast turn-on
and turn-off times ensure a wide-range PWM operation,
while wave-shaping circuitry minimizes EMI. The differen-
tial current-sense input increases LED current accuracy
and noise immunity. The MAX16804 is well suited for
applications requiring high-voltage input and is able to
withstand automotive load-dump events up to 45V. An
on-board pass element minimizes external components
while providing 3% output-current accuracy. Additional
features include a 5V regulated output and short-circuit
and thermal protection.
The MAX16804 is available in a thermally enhanced,
5mm x 5mm, 20-pin TQFN package and is specified over
the automotive -40°C to +125°C temperature range.
Applications
Automotive Interior: Map, Dome, and Courtesy
Lighting
Automotive Exterior:
Rear Combination Light (RCL)
Daytime Running Light (DRL)
Adaptive Front Light
Warning Lights for Emergency Vehicles
Navigation and Marine Indicators
Signage, Canopies, and Beacons
Features
o Flexible Dimming Control, Analog or PWM
Control Signal for PWM and Theater Dimming
o 200Hz On-Board Ramp Generator
o Syncs to External PWM Signal (Up to 2kHz)
o 5.5V to 40V Operating Range
o 35mA to 350mA Adjustable LED Current
o 3% LED Current Accuracy
o High-Voltage (Up to 40V) DIM Pin
o Integrated Pass Element with Low-Dropout
Voltage (0.5V typ)
o Additional +5V On-Board Regulator with 2mA
Capability
o Differential LED Current Sense
o Low 200mV Current-Sense Reference Reduces
Power Losses
o Wave-Shaped Edges Minimize EMI During PWM
Dimming
o Output Short-Circuit and Thermal-Shutdown
Protection
o Available in Small, Thermally Enhanced,
5mm x 5mm, 20-Pin TQFN Package
o -40°C to +125°C Operating Temperature Range
MAX16804
High-Voltage, 350mA LED Driver with
Analog and PWM Dimming Control
________________________________________________________________
Maxim Integrated Products
1
Ordering Information
MAX16804
IN
OUT
V5
LEDs
R
SENSE
ILED
0.1μF
+5.5V TO +40V
+5V REG
CS+
0.1μF
CS-
DIM
GND
EN
V5
ANALOG CONTROL PWM DIMMING
Simplified Diagrams
19-0589; Rev 1; 5/08
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.
+
Denotes a lead-free/RoHS-compliant package.
*
EP = Exposed pad.
Pin Configuration appears at end of data sheet.
PART TEMP RANGE PIN-PACKAGE
MAX16804ATP+ -40°C to +125°C 20 TQFN-EP*
MAX16804
IN
OUT
V5
LEDs
R
SENSE
0.1μF
+5.5V TO +40V
PWM CONTROL DIMMING
+5V REG
CS+
0.1μF
CS-
DIM
PWM DIMMING
GND
EN
ILED
MAX16804
High-Voltage, 350mA LED Driver with
Analog and PWM Dimming Control
2 _______________________________________________________________________________________
ABSOLUTE MAXIMUM RATINGS
ELECTRICAL CHARACTERISTICS
(V
IN
= V
EN
= 12V, C
V5
= 0.1µF, I
V5
= 0, CS- = GND, R
SENSE
= 0.56Ω (see the
Typical Operating Circuit
), V
DIM
= 4V, T
A
= T
J
= -40°C
to +125°C, unless otherwise noted. Typical values are at T
A
= T
J
= +25°C.) (Note 1)
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
DIM, OUT, EN to GND .................................-0.3V to (V
IN
+ 0.3V)
IN Slew Rate (20V < V
IN
< 45V) ...................................250mV/µs
CS+, V5 to GND .......................................................-0.3V to +6V
CS- to GND............................................................-0.3V to +0.3V
OUT Short Circuited to GND Duration
(at V
IN
< +16V).................................................................1hour
Maximum Current Into Any Pin (except IN and OUT).........±20mA
Continuous Power Dissipation (T
A
= +70°C)
20-Pin TQFN (derate 34.5mW/
°
C above +70
°
C) ......2758.6mW
Operating 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) 5.5 40.0 V
Ground Current I
G
I
LOAD
= 350mA 2.5 4.5 mA
Shutdown Supply Current I
SHDN
V
EN
≤ 0.3V 12 40 µA
Guaranteed Output Current I
OUT
R
SENSE
= 0.55Ω 350 mA
Output Current Accuracy
35mA < I
OUT
< 350mA, not including
R
SENSE
tolerance
3%
I
OUT
= 350mA, 12V < V
IN
< 40V 0.4 1.2
Dropout Voltage (Note 3) ΔV
DO
I
OUT
= 350mA, 6.5V < V
IN
< 12V 0.5 1.5
V
Current rising, DIM rising to 4V 17
Output Current Slew Rate
(External PWM Signal at DIM)
Current falling, DIM falling to 0.6V 17
mA/µs
Short-Circuit Current V
OUT
= 0V 600 mA
ENABLE INPUT
EN Input Current I
EN
100 nA
EN Input-Voltage High V
IH
2.8 V
EN Input-Voltage Low V
IL
0.6 V
Enable Turn–On Time t
ON
EN rising edge to 90% of OUT 250 µs
CURRENT SENSE (Note 4)
Regulated R
SENSE
Voltage V
RSENSE
V
SENSE
= V
CS+
- V
CS-
192 198 204 mV
Input Current (CS+) V
CS+
= 220mV +14 µA
Input Current (CS-) V
CS+
= 220mV -75 µA
INTERNAL RAMP GENERATOR
Internal Ramp Frequency f
RAMP
180 200 220 Hz
External Sync Frequency Range f
DIM
80 2000 Hz
External Sync Voltage Low 0.4 V
External Sync Voltage High 2.8 V
EXTERNAL PWM DIMMING INPUT
DIM Input Current 1µA
Turn-On Time t
ON
After DIM rising to 4V (Note 5) 28 52 µs
Turn-Off Time t
OFF
After DIM falling to 0.6V (Note 5) 19 38 µs
MAX16804
High-Voltage, 350mA LED Driver with
Analog and PWM Dimming Control
_______________________________________________________________________________________ 3
Note 1: All devices are 100% production tested at T
A
= +25°C. Limits over the operating temperature range are guaranteed by design.
Note 2: Resistors were added from OUT to CS+ to aid with the power dissipation during testing.
Note 3: Dropout is measured as follows:
Connect a resistor from OUT to CS+. Connect R
SENSE
= 0.56Ω from CS+ to CS-. Set V
IN
= V
OUT
+3V (record V
OUT
as
V
OUT1
). Reduce V
IN
until V
OUT
= 0.97 x V
OUT1
(record as V
IN2
and V
OUT2
). ΔV
DO
= V
IN2
- V
OUT2
.
Note 4: I
V5
= 0mA.
Note 5: 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 13Ω from OUT to CS+.
Note 6: Thermal shutdown does not function if the output of the 5V reference is shorted to ground. Shorting V5 to GND disables the
output.
ELECTRICAL CHARACTERISTICS (continued)
(V
IN
= V
EN
= 12V, C
V5
= 0.1µF, I
V5
= 0, CS- = GND, R
SENSE
= 0.56Ω (see the
Typical Operating Circuit
), V
DIM
= 4V, T
A
= T
J
= -40°C
to +125°C, unless otherwise noted. Typical values are at T
A
= T
J
= +25°C.) (Note 1)
PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS
THERMAL PROTECTION
Thermal-Shutdown Temperature T
J
(
SHDN
)
+155 °C
Thermal-Shutdown Hysteresis 23 °C
+5V REGULATOR
Output Voltage Regulation V5 0 ≤ I
V5
≤ 2mA 4.8 5.1 5.4 V
V5 Short-Circuit Current V5 = 0V (Note 6) 12 mA
Typical Operating Characteristics
(V
IN
= 12V, V
EN
= V
IN
, C
V5
= 0.1µF, I
V5
= 0, CS- = GND, R
SENSE
= 0.56Ω, connect OUT to CS+, V
DIM
= 4V, T
A
= +25°C, unless
otherwise noted.)
OUTPUT CURRENT
vs. TEMPERATURE
MAX16804 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
MAX16804 toc02
OUTPUT CURRENT (mA)
(V
CS+
- V
CS-
) (V)
320290230 26080 110 140 170 20050
0.194
0.195
0.196
0.197
0.198
0.199
0.200
0.201
0.202
0.203
0.193
20 350
V
IN
= 12V
OUTPUT CURRENT
vs. INPUT VOLTAGE
MAX16804 toc03
INPUT VOLTAGE (V)
OUTPUT CURRENT (mA)
14122 4 6 8 10
50
100
150
200
250
300
350
400
0
016
I
OUT
= 350mA
I
OUT
= 100mA
P1-P3P4-P6P7-P9P10-P10

MAX16804ATP+

Mfr. #:
Buy MAX16804ATP+
Manufacturer:
Maxim Integrated
Description:
LED Lighting Drivers 350mA HB LED Drvr w/analog & PWM Dim
Lifecycle:
New from this manufacturer.
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