MAX6978 Ver la hoja de datos (PDF) - Maxim Integrated

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MAX6978

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

Maxim Integrated 

8-Port, 5.5V Constant-Current LED Driver with

LED Fault Detection and Watchdog

ABSOLUTE MAXIMUM RATINGS

Voltage (with respect to GND)

V+ ............................................................................-0.3V to +6V

OUT_ .......................................................................-0.3V to +6V

DIN, CLK, LE, OE, SET ................................-0.3V to (V+ + 0.3V)

DOUT Current ..................................................................±10mA

OUT_ Sink Current .............................................................60mA

Total GND Current ...........................................................480mA

Continuous Power Dissipation (TA = +70°C)

16-Pin SSOP (derate 7.1mW/°C above +70°C) ............571mW

16-Pin PDIP (derate 10.5mW/°C above +70°C)............842mW

16-Pin TSSOP (derate 21.3mW/°C over

TA = +70°C) ..............................................................1702mW

Operating Temperature Range .........................-40°C to +125°C

Junction Temperature ......................................................+150°C

Storage Temperature Range .............................-65°C to +150°C

Lead Temperature (soldering, 10s) .................................+300°C

Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only, and functional

operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to

absolute maximum rating conditions for extended periods may affect device reliability.

ELECTRICAL CHARACTERISTICS

(Typical Operating Circuit, V+ = 3V to 5.5V, TA = TMIN to TMAX, unless otherwise noted. Typical values are at V+ = 5V, TA = +25°C.)

(Note 1)

PARAMETER

Operating Supply Voltage

Output Voltage

Standby Current

(Interface Idle, All Output Ports

High Impedance, RSET = 360Ω)

Standby Current

(Interface Running, All Output

Ports High Impedance,

RSET = 360Ω)

Supply Current

(Interface Idle, All Output Ports

Active Low, RSET = 360Ω)

Input High Voltage

DIN, CLK, LE, OE

SYMBOL

V+

VOUT

CONDITIONS

I+

All logic inputs at V+ or GND, DOUT

unloaded

I+

fCLK = 5MHz, OE = V+, DIN and LE = V+

or GND, DOUT unloaded

I+

All logic inputs at V+ or GND,

DOUT unloaded

VIH

MIN TYP

3.0

4.5

4.7

10

0.7 V+

MAX

5.5

5.5

UNITS

V

V

5.6

mA

6

mA

25

mA

V

Input Low Voltage

DIN, CLK, LE, OE

VIL

0.3 V+

V

Hysteresis Voltage

DIN, CLK, LE, OE

∆VI

0.8

V

Input Leakage Current

DIN, CLK, LE, OE

IIH, IIL

-1

+1

µA

Output-High Voltage DOUT

Output Low Voltage

Output Current

OUT_

Output Leakage Current OUT_

Watchdog Timeout

VOH

VOL

IOUT

ILEAK

tWD

ISOURCE = 4mA

ISINK = 4mA

V+ = 3V to 5.5V, VOUT = 0.8V to 2.5V,

RSET = 360Ω

OE = V+, VOUT = V+

V+

- 0.5V

V

0.5

V

42

50

56

mA

1

µA

1

s

2 _______________________________________________________________________________________

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