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PDF MAX16806 Data sheet ( Hoja de datos )
| Número de pieza | MAX16806 | |
| Descripción | (MAX16805 / MAX16806) EEPROM-Programmable | |
| Fabricantes | Maxim Integrated Products | |
| Logotipo |  |
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19-0625; Rev 0; 8/06
EEPROM-Programmable, High-Voltage, 350mA
LED Drivers with LED Current Foldback
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
o EEPROM or I2C* Dynamically Programmable:
LED Current Foldback for High Input Voltage
LED Current Reference
LED Current Thermal Foldback (MAX16806)
o On-Board 200Hz Ramp Generator Eliminates the
Need for µC PWM Signal
o Flexible Analog or PWM Control for PWM or
Theater Dimming
o Wetting Current and Debounce for Momentary
Switch (MAX16806)
o 5.5V to 40V Input with Up to 39V Output Capability
o 35mA to 350mA Adjustable LED Current
o Waveshaping Minimizes EMI During Dimming
o Output Short-Circuit and Overtemperature
Protection
o -40°C to +125°C Operating Temperature Range
Ordering Information
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
+Denotes lead-free package.
**EP = Exposed pad.
Pin Configurations appear at end of data sheet.
*Purchase of I2C components from Maxim Integrated Products,
Inc. or one of its sublicensed Associated Companies, conveys
a license under the Philips I2C Patent Rights to use these com-
ponents in an I2C system, provided that the system conforms
to the I2C Standard Specification as defined by Philips.
Typical Operating Circuits
+5.5V TO +40V
IN
0.1µF
EN
SERIAL CLOCK
SERIAL DATA
V5
SCL
SDA MAX16805
ILED
OUT
+5V REG
V5
0.1µF
CS+
LEDs
RSENSE
CS-
DIM
GND
+5.5V TO +40V
IN
V5 0.1µF
EN
VCC
MAX6613† OUT
MAX16806
TFP/SCL
ILED
OUT
+5V REG
V5
0.1µF
CS+
TFN/SDA
GND
CS-
PWM DIMMING
SW
DIM GND
LEDs
RSENSE
ANALOG CONTROL PWM DIMMING
†MAX6613 THERMAL SENSOR IS OPTIONAL.
PWM CONTROL DIMMING
________________________________________________________________ Maxim Integrated Products 1
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.
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EEPROM-Programmable, High-Voltage, 350mA
LED Drivers with LED Current Foldback
ELECTRICAL CHARACTERISTICS (continued)
(VIN = VEN = 12V, CV5 = 0.1µF, IV5 = 0, CS- = GND, RSENSE = 0.56Ω, VDIM = 4V, DGND = GND, TFP/SCL = 5V, TFN/SDA = 0V,
SW = CFD = Open, TA = TJ = -40°C to +125°C, unless otherwise noted. Typical values are at TA = +25°C.) (Note 1)
PARAMETER
SYMBOL
CONDITIONS
MIN TYP MAX UNITS
EEPROM
VIN Voltage for EEPROM
Programming
20 22 24
V
EEPROM Data-Retention Time
I2C DIGITAL INPUTS (TFP/SCL, TFN/SDA) (Note 5)
Logic Input-Voltage High
VIH
Logic Input-Voltage Low
VIL
Input Capacitance
10 Years
2.8 V
0.8 V
5 pF
SDA Output Voltage Low
I2C INTERFACE TIMING (Figure 1)
Serial Clock Frequency
Bus Free Time Between STOP
and START Condition
VOL
fSCL
tBUF
ISINK = 3mA
0.4 V
400 kHz
1.3 µs
START Condition Hold Time
Clock Low Period
Clock High Period
tHD:STA
tLOW
tHIGH
0.6 µs
1.3 µs
0.6 µs
Repeat START Condition Setup
Time
tSU:STA
0.6 µs
Data Hold Time
tHD:DAT
A master device must provide a hold time
of at least 300ns for the SDA signal
(referred to VIL of the SCL signal) in order
to bridge the undefined region of SCL’s
falling edge
0
0.9 µs
Data Setup Time
Receive SCL/SDA Rise Time
Receive SCL/SDA Fall Time
STOP Condition Setup Time
Pulse Width of Spike Suppressed
Transmit SDA Fall Time
tSU:DAT
tR
tF
tSU:STO
tSP
ISINK < 6mA, CB ≤ 400pF (Note 6)
100
300
250
0.6
50
250
ns
ns
ns
µs
ns
ns
Note 1: All devices 100% production tested at TJ = +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 RSENSE = 0.56Ω from CS+ to CS-. Set VIN =
VOUT +3V (record VOUT as VOUT1). Reduce VIN until VOUT = 0.97 x VOUT1 (record as VIN2 and VOUT2). ∆VDO = VIN2 - VOUT2.
Note 4: 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 5: TPF/SCL (SCL for MAX16805) and TPN/SDA (SDA for the MAX16805) are I2C interface compatible only when the
MAX16805/MAX16806 are the only parts on the bus for production programming.
Note 6: CB is the total bus capacitance.
_______________________________________________________________________________________ 5
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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 by varying the PWM
duty cycle. Figure 2 shows a simple circuit that imple-
ments theater dimming with a DC input signal.
Thermal Sensor Inputs/I2C Interface
(TFP/SCL and TFN/SDA)
The MAX16806 features dual-function inputs, TFP/SCL
and TFN/SDA. In programming mode, TFP/SCL and
TFN/SDA serve as the I2C serial communication inter-
face. TFP/SCL and TFN/SDA also serve as inputs for
analog signals generated by an external temperature
sensor such as the MAX6613.
The MAX16805 does not offer dual-function inputs. SCL
and SDA are used only to communicate with the
MAX16805 through the I2C interface.
Momentary Switch Interface (SW)
The MAX16806 offers a momentary switch (SW) that
overrides the analog dimming signal by latching the
output current to 100% duty cycle. The MAX16806
does not override external PWM signal at DIM or dim-
ming caused by thermal or LED current foldback. To
latch the output current into a 100% duty cycle, press
SW once. To restore the initial duty cycle determined
by the DC level at DIM, press SW again. The
MAX16806 provides a minimum of 1mA of wetting cur-
rent to the momentary switch.
Overtemperature Protection
The MAX16805/MAX16806 enter a thermal shutdown in
the event of overheating. This typically occurs in over-
load or output short-circuit conditions. When the junc-
tion temperature exceeds TJ = +155°C (typ), the
internal thermal protection circuitry turns off the pass
device. The MAX16805/MAX16806 recover from ther-
mal shutdown once the junction temperature drops by
+23°C (typ). This feature allows self-protection by ther-
mally cycling in the event of a short-circuit or overload
condition.
Digital Interface
The MAX16805/MAX16806 feature an I2C, 2-wire serial
interface consisting of a bidirectional serial data line
(SDA) and a serial clock line (SCL). SDA and SCL facili-
tate bidirectional communication between the
MAX16805/MAX16806 and the master device at rates
up to 400kHz. The master (typically a microcontroller)
initiates data transfer on the bus and generates SCL.
VIN
THEATER
DIMMING
SIGNAL
IN OUT
+5V REG
EN V5
MAX16805
MAX16806
0.1µF
LEDs
CS+
DIM CS-
GND
RSENSE
Figure 2. Theater Dimming Light
SDA
SCL
SP
START
CONDITION
STOP
CONDITION
Figure 3. I2C Communication Start and Stop Conditions
Start and Stop Conditions
Both SCL and SDA remain high when the interface is
not busy. A master controller signals the beginning of a
transmission with a START condition by transitioning
SDA from high to low while SCL is high. The master
controller issues a STOP condition by transitioning the
SDA from low to high while SCL is high, when it finishes
communicating with the slave. The bus is then free for
another transmission (Figure 3).
______________________________________________________________________________________ 11
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| PDF Descargar | [ Datasheet MAX16806.PDF ] | |
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