MAX6978AUE+ by Analog Devices

8-Port, 5.5V Constant-Current LED Driver with LED Fault Detection and Watchdog

Status: Active
Series: MAX6978
RoHS: Unknown
Download Datasheet Visit Manufacturer Site View Pricing & Stock
The MAX6978 serial-interfaced LED driver provides eight open-drain, constant-current sinking LED driver outputs rated at 5.5V. The MAX6978 operates from a 3V to 5.5V supply. The MAX6978 supply and the LEDs' supply can power up in any order. The constant-current outputs are programmed together to up to 55mA using a single external resistor. The MAX6978 operates with a 25Mb, industry-standard, 4-wire serial interface. The MAX6978 includes circuitry that automatically detects open-circuit LEDs. Fault status is loaded into the serial-interface shift register when LE goes high and is automatically shifted out on DOUT when the next data transmission is shifted in. The MAX6978 includes a fail-safe feature for safety related applications, which blanks the display if the serial interface fails. If the serial interface becomes inactive for more than 1s, all driver output latches are automatically cleared. This turns off all LEDs connected to the outputs. The shift register data is not disturbed. The outputs remain off until the driver output latches are updated with data turning them on, so recovery is automatic if the transmission failure is temporary. The watchdog function requires no software change to the application driving the MAX6978. The MAX6978 uses the industry-standard shift-register-plus-latch-type serial interface. The driver accepts data shifted into an 8-bit shift register using data input DIN and clock input CLK. Input data appears at the output DOUT eight clock cycles later to allow cascading of multiple MAX6978s. The latch-enable input LE loads the 8 bits of shift-register data into an 8-bit output latch to set which LEDs are on and which are off. The output-enable input active-low OE gates all eight outputs on and off, and is fast enough to be used as a PWM input for LED intensity control. The MAX6978 is one of a family of 12 shift-register-plus-latch-type LED drivers. The family includes 8-port and 16-port types, with 5.5V- or 36V-rated LED outputs, with and without open-circuit LED detection and watchdog. All versions operate from a 3V to 5.5V supply, and are specified over the -40°C to +125°C temperature range.

Where to Buy

Prices starting from US$1.27

Distributor Stock
Logo for Rochester Electronics
Rochester Electronics
from US$1.27
3,790
in stock
 Buy Now
Logo for Farnell UK
Farnell
from US$4.66
0
in stock
 Buy Now
Buy Now

Features

25Mb Industry-Standard 4-Wire Serial Interface at 5V
3V to 5.5V Logic Supply
8 Constant-Current LED Outputs Rated at 5.5V
Up to 55mA Continuous Current per Output
Output Current Programmed by Single Resistor
3% Current Matching Between Outputs
6% Current Matching Between ICs
Watchdog Clears Display if Interface Fails
Reports Open-Circuit LED Faults
-40°C to +125°C Temperature Range

Specifications

LCD or LED LED
Display Type Common Anode
Interface Serial 4-Wire 25Mbit
Digits or Char. 8-Segment
Output Format Any digit type
Segment Blinking No
VSUPPLY (V) (min) 3
VSUPPLY (V) (max) 5.5
Package/Pins TSSOP/16
BudgetaryPrice (See Notes) 2.86

Last 6 months Inventory & Pricing History

MAX6978AUE+ Maxim Integrated Parts by Analog Devices

LED DRIVER CONSTANT CURRENT TSSOP-EP16

LED Lighting Components
> LED Driver ICs
> DC / DC LED Driver ICs
Status: Unknown
Series: -
RoHS: Unknown
Download Datasheet Visit Manufacturer Site View Pricing & Stock

Specifications

Device Topology Constant Current
Input Voltage Min 3V
Input Voltage Max 5.5V
Output Voltage Max 5.5V
Output Current Max 55mA
Switching Frequency -
No. of Outputs 8Outputs
IC Mounting SMD
No. of Pins 16Pins
Operating Temperature Min -40°C
Operating Temperature Max 125°C
Product Range -
Automotive Qualification Standard -
SVHC No SVHC (15-Jan-2018)

Last 6 months Inventory & Pricing History

Alternative Descriptions

LED DRIVER, CONSTANT CURRENT, TSSOP-EP16 | Farnell

Frequently Asked Questions

Where can I find additional details, specifications and documents for a MAX6978AUE+ ?

Additional datasheets, footprints and schematics for MAX6978AUE+ are listed on our Part Details page. You can also find images and similar parts to MAX6978AUE+ on this page.

What pricing and inventory information can I view?

Distributor pricing and stock information is available for MAX6978AUE+ on our Product Comparison page. Access via the 'View Pricing & Stock' button to view MAX6978AUE+ price breaks, MOQs, lead times, inventory and SKUs from distributors.

Who can I contact for technical support of the product?

Submit any questions directly to the customer support team of the distributor listing the product. For the MAX6978AUE+ you can contact the distributor directly for product support, shipping queries etc.

Is the MAX6978AUE+ RoHS compliant?

This part has not been flagged as RoHS Compliant.

Which authorised distributors for MAX6978AUE+ have stock available?

Authorised distributors including Rochester Electronics and Farnell have stock available or on a lead time for MAX6978AUE+ .

How do I check stock and lead times for all distributors?

Stock availability and lead times will be displayed for MAX6978AUE+ often in real-time on the comparison pages.

What if I can't find stock of MAX6978AUE+ ?

You can fill out our help required form which you can use to request a quote for MAX6978AUE+ from some of our verified obsolescence suppliers. Alternatively, contact us via our web chat in the bottom left of your screen and one of our team will try to help.