MAX16805ATP+ Maxim Integrated Products, MAX16805ATP+ Datasheet

IC LED DRIVR HIGH BRIGHT 20-TQFN

MAX16805ATP+

Manufacturer Part Number
MAX16805ATP+
Description
IC LED DRIVR HIGH BRIGHT 20-TQFN
Manufacturer
Maxim Integrated Products
Type
HBLED Driverr
Datasheet
1.MAX16805ATP.pdf (19 pages)

Specifications of MAX16805ATP+

Constant Current
Yes
Topology
PWM
Number Of Outputs
1
Internal Driver
Yes
Type - Primary
Automotive
Type - Secondary
High Brightness LED (HBLED)
Frequency
400kHz
Voltage - Supply
5.5 V ~ 40 V
Voltage - Output
5.1V
Mounting Type
Surface Mount
Package / Case
20-TQFN Exposed Pad
Operating Temperature
-40°C ~ 125°C
Current - Output / Channel
350mA
Internal Switch(s)
Yes
High Level Output Current
350 mA
Operating Supply Voltage
5.5 V to 40 V
Maximum Power Dissipation
2758.6 mW
Maximum Operating Temperature
+ 125 C
Mounting Style
SMD/SMT
Minimum Operating Temperature
- 40 C
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
Efficiency
-
Lead Free Status / Rohs Status
Lead free / RoHS Compliant
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.
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.
350mA LED Drivers with LED Current Foldback
Automotive Interior: Map, Dome, and Courtesy
Lighting
Automotive Exterior:
Emergency Vehicle Warning Lights
Navigation and Marine Indicators
SERIAL CLOCK
SERIAL DATA
Rear Combination Light (RCL)
Daytime Running Light (DRL)
Adaptive Front Light
0.1μF
+5.5V TO +40V
V5
________________________________________________________________ Maxim Integrated Products
ANALOG CONTROL PWM DIMMING
IN
EN
SCL
SDA
DIM
EEPROM-Programmable, High-Voltage,
General Description
MAX16805
GND
OUT
CS+
CS-
V5
Applications
+5V REG
I
LED
0.1μF
R
LEDs
SENSE
† MAX6613 THERMAL SENSOR IS OPTIONAL.
MAX6613 †
♦ EEPROM or I
♦ On-Board 200Hz Ramp Generator Eliminates the
♦ Flexible Analog or PWM Control for PWM or
♦ Wetting Current and Debounce for Momentary
♦ 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
♦ -40°C to +125°C Operating Temperature Range
+ Denotes lead-free package.
** EP = Exposed pad.
Pin Configurations appear at end of data sheet.
PWM DIMMING
MAX16805ATP+ -40°C to +125°C 20 TQFN-EP** T2055M-5
MAX16806ATP+ -40°C to +125°C 20 TQFN-EP** T2055M-5
GND
V
V5
Need for µC PWM Signal
Theater Dimming
Switch (MAX16806)
Protection
CC
LED Current Foldback for High Input Voltage
LED Current Reference
LED Current Thermal Foldback (MAX16806)
PART
OUT
0.1μF
+5.5V TO +40V
Typical Operating Circuits
2
C Dynamically Programmable:
TEMP RANGE
TFN/SDA
SW
IN
EN
TFP/SCL
DIM
PWM CONTROL DIMMING
Ordering Information
MAX16806
GND
OUT
CS+
PIN
PACKAGE
CS-
V5
+5V REG
I
LED
0.1μF
Features
R
LEDs
SENSE
CODE
PKG
1

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MAX16805ATP+ Summary of contents

Page 1

... Waveshaping Minimizes EMI During Dimming ♦ Output Short-Circuit and Overtemperature Protection ♦ -40°C to +125°C Operating Temperature Range PART Applications MAX16805ATP+ -40°C to +125°C 20 TQFN-EP** T2055M-5 MAX16806ATP+ -40°C to +125°C 20 TQFN-EP** T2055M-5 + Denotes lead-free package Exposed pad. Pin Configurations appear at end of data sheet. I ...

Page 2

EEPROM-Programmable, High-Voltage, 350mA LED Drivers with LED Current Foldback ABSOLUTE MAXIMUM RATINGS IN to GND ...............................................................-0.3V to +45V DIM, OUT GND ................................-0. Slew Rate (20V < V < 45V) ...................................250mV/µs IN SDA, SCL (MAX16805), TFN/SDA, ...

Page 3

EEPROM-Programmable, High-Voltage, 350mA LED Drivers with LED Current Foldback ELECTRICAL CHARACTERISTICS (continued 12V 0.1µ CS- = GND CFD = Open ...

Page 4

EEPROM-Programmable, High-Voltage, 350mA LED Drivers with LED Current Foldback ELECTRICAL CHARACTERISTICS (continued 12V 0.1µ CS- = GND CFD = Open ...

Page 5

EEPROM-Programmable, High-Voltage, 350mA LED Drivers with LED Current Foldback ELECTRICAL CHARACTERISTICS (continued 12V 0.1µ CS- = GND CFD = Open ...

Page 6

EEPROM-Programmable, High-Voltage, 350mA LED Drivers with LED Current Foldback (V = 12V 0.1µ 5V GND, DGND = GND. T TFP/SC TFN/SD OUTPUT CURRENT vs. ...

Page 7

EEPROM-Programmable, High-Voltage, 350mA LED Drivers with LED Current Foldback (V = 12V 0.1µ 5V GND, DGND = GND. T TFP/SC TFN/SD LED CURRENT FALL ...

Page 8

EEPROM-Programmable, High-Voltage, 350mA LED Drivers with LED Current Foldback PIN MAX16805 MAX16806 — 7 — 10, 12, 15 ...

Page 9

EEPROM-Programmable, High-Voltage, 350mA LED Drivers with LED Current Foldback TRIMMED EN BANDGAP MAX16805 MAX16806 DIM GND IN CURRENT CFD FOLDBACK SW (N.C.) REFERENCE GENERATOR V5 EEPROM AND SERIAL INTERFACE V5 _______________________________________________________________________________________ IN V5 REGULATOR 1.25V THERMAL SHUTDOWN EEPROM 210mV 200Hz ...

Page 10

EEPROM-Programmable, High-Voltage, 350mA LED Drivers with LED Current Foldback SDA t BUF t LOW SCL t HD:STA STOP START 2 Figure Serial Interface Timing Diagram Detailed Description The MAX16805/MAX16806 are constant-current regu- lators that provide up to ...

Page 11

EEPROM-Programmable, High-Voltage, 350mA LED Drivers with LED Current Foldback The dimming feature can be used for LED brightness adjustment (see the Typical Operating Circuits ) and theater dimming. If the external PWM signal is used, theater dimming can be achieved ...

Page 12

EEPROM-Programmable, High-Voltage, 350mA LED Drivers with LED Current Foldback One data bit is transferred during each clock pulse. The data on the SDA line must remain stable while SCL is high (Figure 4). The acknowledge bit is a clocked 9th ...

Page 13

EEPROM-Programmable, High-Voltage, 350mA LED Drivers with LED Current Foldback Message Format Write to the MAX16805/MAX16806 by transmitting the device’s slave address with R/W, 8th bit set to zero fol- lowed by at least 1 byte of information first byte of ...

Page 14

EEPROM-Programmable, High-Voltage, 350mA LED Drivers with LED Current Foldback Binning Adjustment Register (0x00) The Binning Adjustment register is a 4-bit register that sets the differential regulation voltage reference between CS+ and CS-. Only the first 4 bits of the data ...

Page 15

EEPROM-Programmable, High-Voltage, 350mA LED Drivers with LED Current Foldback Thermal Foldback Knee Point (TFK) Register (0x03), MAX16806 The TFK register is a 4-bit register that sets the thermal knee. Only the first 4 bits of the data byte program the ...

Page 16

EEPROM-Programmable, High-Voltage, 350mA LED Drivers with LED Current Foldback Thermal Foldback Clamp Level Register (0x05), MAX16806 Thermal Foldback Clamp Level is a 3-bit register that sets the minimum percentage of the LED current. Only the first 3 bits of the ...

Page 17

EEPROM-Programmable, High-Voltage, 350mA LED Drivers with LED Current Foldback TOP VIEW GND 16 DIM 17 18 N.C. MAX16805 EN 19 OUT THIN QFN Chip Information PROCESS: BiCMOS-DMOS ______________________________________________________________________________________ 11 10 ...

Page 18

EEPROM-Programmable, High-Voltage, 350mA LED Drivers with LED Current Foldback (The package drawing(s) in this data sheet may not reflect the most current specifications. For the latest package outline information go to www.maxim-ic.com/packages.) 18 ______________________________________________________________________________________ Package Information ...

Page 19

... 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. Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600 ____________________ 19 © 2007 Maxim Integrated Products Package Information (continued registered trademark of Maxim Integrated Products, Inc ...

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