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MAX16805ATP+T

P1-P3P4-P6P7-P9P10-P12P13-P15P16-P18P19-P19
General Description
The MAX16805/MAX16806 LED drivers eliminate the
need for microcontrollers or switch-mode converters for
automotive interior dome, map, and courtesy light
applications. An EEPROM-programmable LED current-
sense reference simplifies production by using one
sense resistor to set the LED current for all LED bins. A
dual-mode DIM pin and an on-board 200Hz ramp gen-
erator allow for PWM dimming with an analog or PWM
control signal. The analog control signal at dimming
input DIM allows for the “theater dimming” effect to be
implemented. Fast turn-on/-off times ensure a wide-
range PWM operation, while waveshaping circuitry min-
imizes EMI. EEPROM-programmable LED current
foldback makes it possible to operate at a high input
voltage, while saving the cost and space associated
with having a large heatsink. The MAX16806 works with
an external thermal sensor to maintain maximum LED
junction temperature by folding back the LED current.
The thermal foldback temperature knee and slope are
EEPROM programmable. The MAX16806 SW pin sup-
plies necessary wetting current to a momentary switch.
Applications
Automotive Interior: Map, Dome, and Courtesy
Lighting
Automotive Exterior:
Rear Combination Light (RCL)
Daytime Running Light (DRL)
Adaptive Front Light
Emergency Vehicle Warning Lights
Navigation and Marine Indicators
Features
♦ EEPROM or I
2
C Dynamically Programmable:
LED Current Foldback for High Input Voltage
LED Current Reference
LED Current Thermal Foldback (MAX16806)
♦ On-Board 200Hz Ramp Generator Eliminates the
Need for µC PWM Signal
♦ Flexible Analog or PWM Control for PWM or
Theater Dimming
♦ Wetting Current and Debounce for Momentary
Switch (MAX16806)
♦ 5.5V to 40V Input with Up to 39V Output Capability
♦ 35mA to 350mA Adjustable LED Current
♦ Waveshaping Minimizes EMI During Dimming
♦ Output Short-Circuit and Overtemperature
Protection
♦ -40°C to +125°C Operating Temperature Range
MAX16805/MAX16806
EEPROM-Programmable, High-Voltage,
350mA LED Drivers with LED Current Foldback
________________________________________________________________
Maxim Integrated Products
1
Ordering Information
19-0625; Rev 1; 1/07
For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct! at
1-888-629-4642, or visit Maxim’s website at www.maxim-ic.com.
Pin Configurations appear at end of data sheet.
+
Denotes lead-free package.
**
EP = Exposed pad.
EVALUATION KIT
AVAILABLE
PART
TEMP RANGE
PIN
PACKAGE
PKG
CODE
MAX16805ATP+
-40°C to +125°C 20 TQFN-EP**
T2055M-5
MAX16806ATP+
-40°C to +125°C 20 TQFN-EP**
T2055M-5
MAX16805
IN
OUT
V5
LEDs
I
LED
R
SENSE
0.1μF
+5.5V TO +40V
+5V REG
CS+
0.1μF
CS-
DIM
GND
EN
V5
ANALOG CONTROL PWM DIMMING
SCL
SDA
SERIAL CLOCK
SERIAL DATA
I
LED
MAX16806
MAX6613
†
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
TFP/SCL
TFN/SDA
V
CC
V5
GND
OUT
SW
†
MAX6613 THERMAL SENSOR IS OPTIONAL.
Typical Operating Circuits
MAX16805/MAX16806
EEPROM-Programmable, High-Voltage, 350mA
LED Drivers with LED Current Foldback
2 _______________________________________________________________________________________
ABSOLUTE MAXIMUM RATINGS
ELECTRICAL CHARACTERISTICS
(V
IN
= V
EN
= 12V, C
V5
= 0.1µF, I
V5
= 0, CS- = GND, R
SENSE
= 0.56Ω, V
DIM
= 4V, DGND = GND, TFP/SCL = 5V, TFN/SDA = 0V,
SW = CFD = Open, T
A
= T
J
= -40°C to +125°C, unless otherwise noted. Typical values are at T
A
= +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
SDA, SCL (MAX16805), TFN/SDA,
TFP/SCL (MAX16806) to GND...............................-0.3V to +6V
CFD, CS+, V5 to GND ..............................................-0.3V to +6V
DGND and CS- to GND.........................................-0.3V to +0.3V
OUT Short Circuited to GND Duration (V
IN
< +16V)..........1 hour
Maximum Current Into Any Pin (except IN and OUT) ......±20mA
Continuous Power Dissipation (T
A
= +70°C)
20-Pin Thin QFN (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 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, R
SENSE
tolerance
not included
3.0 %
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 225 µs
5V REGULATOR
0 < I
V5
< 0.5mA,
SW = GND
4.9 5.1 5.3
Output Voltage Regulation
(MAX16806)
V5 6.5V < V
IN
< 40V
0 < I
V5
< 2mA,
SW = open
4.9 5.1 5.3
V
Output Voltage Regulation
(MAX16805)
V5 0 < I
V5
< 2mA, 6.5V < V
IN
< 40V 4.9 5.1 5.3 V
CURRENT SENSE
Regulated R
SENSE
Voltage V
RSNS
V
SENSE
= [V
CS+
- V
CS-
], Binning
Adjustment register at factory default
(0x0F)
192 198 204 mV
Input Current (CS+) V
CS+
= 210mV 12 µA
Input Current (CS-) V
CS+
= 210mV -75 µA
MAX16805/MAX16806
EEPROM-Programmable, High-Voltage, 350mA
LED Drivers with LED Current Foldback
_______________________________________________________________________________________ 3
PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS
Minimum Regulated V
SENSE
Programming Range
V
SENSE
MIN
99.4 103 106.6
Maximum Regulated V
SENSE
Programming Range
V
SENSE
MAX
192 198 204
mV
Regulated V
SENSE
Default
Voltage
V
SENSE
DEF
Binning Adjustment register at factory
default (0x0F)
198 mV
EXTERNAL PWM DIMMING INPUT
DIM Input Current 0.5 µA
Turn-On Time t
ON
After DIM rising to 4V (Note 4) 28 52 µs
Turn-Off Time t
OFF
After DIM falling to 0.6V (Note 4) 19 38 µs
THERMAL FOLDBACK (MAX16806 with MAX6613)
Maximum Thermal Foldback
Knee Point Programming Range
TF
KNEE
MAX
326 335 354
Minimum Thermal Foldback Knee
Point Programming Range
TF
KNEE
MIN
1143 1174 1213
mV
M i ni m um Ther m al Fol d b ack
Tem p er atur e P r og r am m i ng Rang e
TF
( M I N )
+ 60
M axi m um Ther m al Fol d b ack
Tem p er atur e P r og r am m i ng Rang e
TF
(MAX)
+135
° C
Thermal Foldback Default
Threshold Temperature
V
TH
Thermal Foldback Knee Point register at
factory default (0x00)
+60 °C
Thermal Foldback Default
Threshold Voltage
TF
VTH
1.174 V
M i ni m um Ther m al Fol d b ack S l op eTF
SL
MIN
3.88 4 4.12 V/V
M axi m um Ther m al Fol d b ack S l op eTF
SL
MAX
15.52 16 16.48 V/V
Thermal Foldback Default Slope
Thermal Foldback Slope Gain register at
factory default (0x03)
4 V/V
I
2
C interface active -0.3 V5
TFP/SCL (SCL for MAX16805)
Voltage Compliance Range
V
TFP
Remote thermal sensor active +0.3 V5
V
TFN/SDA (SDA for MAX16805)
Voltage Compliance Range
V
TFN
-0.3 V5 V
Minimum Thermal Foldback
Clamp Current Reduction Range
TF
C(MIN)
+25
o
C ≤ T
A
≤ +125
o
C40%
ELECTRICAL CHARACTERISTICS (continued)
(V
IN
= V
EN
= 12V, C
V5
= 0.1µF, I
V5
= 0, CS- = GND, R
SENSE
= 0.56Ω, V
DIM
= 4V, DGND = GND, TFP/SCL = 5V, TFN/SDA = 0V,
SW = CFD = Open, T
A
= T
J
= -40°C to +125°C, unless otherwise noted. Typical values are at T
A
= +25°C.) (Note 1)
P1-P3P4-P6P7-P9P10-P12P13-P15P16-P18P19-P19

MAX16805ATP+T

Mfr. #:
Buy MAX16805ATP+T
Manufacturer:
Maxim Integrated
Description:
LED Lighting Drivers EEPROM-Prog 350mA w/Current Foldback
Lifecycle:
New from this manufacturer.
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