MAX6979AUG+ Maxim Integrated Products, MAX6979AUG+ Datasheet - Page 6

• Manufacturer Part Number: MAX6979AUG+
• Description: IC LED DRIVER LINEAR 24-TSSOP
• Manufacturer: Maxim Integrated Products
• Type: Linear (Serial Interface)r

Specifications of MAX6979AUG+

• Constant Current: Yes
• Topology: 16-Bit Shift Register, Open Drain, PWM
• Number Of Outputs: 16
• Internal Driver: Yes
• Type - Primary: General Purpose
• Voltage - Supply: 3 V ~ 5.5 V
• Voltage - Output: 5.5V
• Mounting Type: Surface Mount
• Package / Case: 24-TSSOP
• Operating Temperature: -40°C ~ 125°C
• Current - Output / Channel: 55mA
• Internal Switch(s): No
• Number Of Segments: 32
• Low Level Output Current: 60 mA
• Operating Supply Voltage: 3 V to 5.5 V
• Maximum Supply Current: 25 mA
• Maximum Power Dissipation: 975 mW
• Maximum Operating Temperature: + 125 C
• Mounting Style: SMD/SMT
• Minimum Operating Temperature: - 40 C
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Frequency: -
• Efficiency: -
• Lead Free Status / Rohs Status: Details

16-Port, 5.5V Constant-Current LED Driver with
LED Fault Detection and Watchdog
The MAX6979 LED driver comprises a 4-wire serial
interface driving eight constant-current sinking open-
drain output ports. The outputs drive LEDs in either sta-
tic or multiplex applications (Figure 1). The constant-
current outputs are guaranteed for current accuracy
Figure 1. MAX6979 Block Diagram
6
5–20
PIN
_______________________________________________________________________________________
21
22
23
24
1
2
3
4
OUT15
OUT0–
NAME
DOUT
GND
CLK
DIN
SET
OE
V+
LE
Ground
Serial-Data Input. Data is loaded into the internal 16-bit shift register on CLK’s rising edge.
Serial-Clock Input. Data is loaded into the internal 16-bit shift register on CLK’s rising edge.
Load-Enable Input. Data is loaded transparently from the internal shift register(s) to the output latch(es)
while LE is high. Data is latched into the output latch(es) on LE's falling edge, and retained while LE is low.
LED Driver Outputs. OUT0 to OUT15 are open-drain, constant-current-sinking outputs rated to 5.5V.
Output Enable Input. High forces outputs OUT0 to OUT15 high impedance without altering the contents of
the output latches. Low enables outputs OUT0 to OUT15 to follow the state of the output latches.
Serial-Data Output. Data is clocked out of the 16-bit internal shift register to DOUT on CLK’s rising edge.
LED Current Setting. Connect SET to GND through a resistor (R
Positive Supply Voltage. Bypass V+ to GND with a 0.1µF ceramic capacitor.
Detailed Description
CLK
DIN
OE
LE
OUT0
D0
D0
D0
OUT1
SERIAL-TO-PARALLEL SHIFT REGISTER
CONSTANT-CURRENT SINKS
OUT2
FAULT DETECTION
LATCHES
OUT13
OUT14
not only with chip-supply voltage variations (5V ±10%
and 3V to 5.5V), but also over a realistic range of driver
output voltage drop (0.5V to 2.5V). The drivers use cur-
rent-sensing feedback circuitry (not simple current mir-
rors) to ensure very small current variations over the full
allowed range of output voltage (see the Typical
Operating Characteristics ).
OUT15
D15
D15
D15
FUNCTION
GND
POWER-ON
REFERENCE
WATCH-
CURRENT
RESET
MAX6979
DOG
V+
SET
) to set the maximum LED current.
GND
DOUT
V+
R
SET
Pin Description