MAX16806：EEPROM-Programmable, High-Voltage, 350mA LED Drivers with LED Current Foldback

High-Current Linear LED Drivers Eliminate the Need for µC or Switch-Mode Converter

The MAX16805/MAX16806 LED drivers eliminate the need for microcontrollers or switch-mode converters. 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 generator 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 minimizes 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 supplies necessary wetting current to a momentary switch.

Key Features

EEPROM or I²C 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: Typical Operating Circuit

Applications/Uses

Emergency Vehicle Warning Lights
Navigation and Marine Indicators

DataSheet

title	Download file
MAX16805-MAX16806 Data Sheet	MAX16805-MAX16806.pdf

Parametrics

Part Number	Regulation Topology	Max. No. of LEDs	LED Channels	LED Configuration	I_LED per Channel (A)	PWM Dimming Freq. (kHz)	Dimming Ratio	Dimming Control	V_DROPOUT (mV)	V_{CURR_SENSE} (mV)	P_OUT (W)	V_IN (V)	V_IN (V)	I_CC (mA)	LED String Volt. (V)	Package/Pins	Budgetary Price
Part Number	Regulation Topology	Max. No. of LEDs	LED Channels	LED Configuration	max	max	max	Dimming Control	typ	V_{CURR_SENSE} (mV)	P_OUT (W)	min	max	max	max	Package/Pins	See Notes
MAX16806	Linear	10	1	Series	0.35	2	200	Analog I2C Serial PWM	400	198	14	6.5	40	4.5	38.6	TQFN/20	$1.56 @1k

Design kits & evaluation modules

Ordering Information

Part Number	Status	Package	Temp	RoHS
MAX16806ATP+	Last Time Buy	TQFN,;20 pin;26 mm²	-40°C to +125°C	Lead Free
MAX16806ATP+T	Active	QFN;	-40°C to +125°C	See data sheet
MAX16806EVMAXQUSB+	No Longer Available	EVKIT;	-40°C to +125°C	See data sheet

MAX16805-MAX16806.pdf MAX16806

MAX16805-MAX16806.pdf MAX16805