DESCRIPTION

ABSOLUTE MAXIMUM RATINGS

(1) (2)

TLC5944

The TLC5944 is a 16-channel, constant current sink driver. Each channel is individually adjustable with 4096

pulse-width modulated (PWM) steps and 64 constant sink current (dot correction) steps. The dot correction (DC)

adjusts for brightness variations between LEDs. Both grayscale (GS) control and DC are accessible via a

common serial interface port. The maximum current value of all 16 channels can be set by a single external

resistor.

The TLC5944 has an internal pre-charge FET to prevent the ghost-lighting phenomenon that occurs on

multiplexed LED systems. The TLC5944 has three error detection circuits for LED open detection (LOD), a

thermal error flag (TEF), and a pre-thermal warning (PTW). The LOD detects a broken or disconnected LED, and

a shorted LED to GND during the display period. The TEF indicates a too-high temperature condition; when the

TEF is set, all output drivers are turned off by the thermal shutdown (TSD) protection. Additionally, when the TEF

is cleared, all output drivers are restarted. The PTW indicates that the IC is operating in a high temperature

condition. The output drivers remain on when PTW is set.

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This integrated circuit can be damaged by ESD. Texas Instruments recommends that all integrated circuits be handled with

appropriate precautions. Failure to observe proper handling and installation procedures can cause damage.

ESD damage can range from subtle performance degradation to complete device failure. Precision integrated circuits may be more

susceptible to damage because very small parametric changes could cause the device not to meet its published specifications.

TRANSPORT MEDIA,

PRODUCT

PACKAGE-LEAD

ORDERING NUMBER

QUANTITY

TLC5944PWPR

Tape and Reel, 2000

TLC5944

HTSSOP-28 PowerPAD™

TLC5944PWP

Tube, 50

TLC5944RHBR

Tape and Reel, 3000

TLC5944

5 mm × 5 mm QFN-32

TLC5944RHBT

Tape and Reel, 250

(1)

For the most current package and ordering information see the Package Option Addendum at the end of this document, or see the TI

web site at www.ti.com.

Over operating free-air temperature range, unless otherwise noted.

PARAMETER

TLC5944

UNIT

–0.3 to +6.0

V

Pre-charge voltage

–0.3 to +16

V

XERR

6

mA

Output current (dc)

OUT0 to OUT15

70

mA

Input voltage range:

V

SIN, SCLK, XLAT, BLANK, GSCLK, DCSEL, IREF

SOUT, XERR

V

Output voltage range

OUT0 to OUT15

V

Operating junction temperature

+150

°C

Storage temperature range

–55 to +150

°C

Human body model (HBM)

2

kV

ESD rating

Charged device model (CDM)

500

V

(1)

Stresses above these ratings may cause permanent damage. Exposure to absolute maximum conditions for extended periods may

degrade device reliability. These are stress ratings only, and functional operation of the device at these or any other conditions beyond

those specified is not supported.

(2)

All voltage values are with respect to network ground terminal.

2

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Product Folder Link(s): TLC5944