Application and Implementation

Note

Information in the following applications sections is not part of the TI component specification, and

TI does not warrant its accuracy or completeness. TI’s customers are responsible for determining

suitability of components for their purposes. Customers should validate and test their design

implementation to confirm system functionality.

1 Application Information

The LP3943 is a 16-channel LED controller which has 16 low-side current switches. Each switch can control the

LED current in its respective LED or LEDs by modulating its duty cycle and frequency.

2 Typical Application

White LEDs

Blue LEDs

+5V

+5V

+5V

R

G

B

LED0

LED2

LED1

LED3

LED4

LED5

LED6

LED7

LED8

LED9

LED10

LED11

LED12

LED13

LED14

LED15

RESET

SCL

SDA

VDD

5V

SDA

SCL

PORTx.D

Cell Phone Baseband

Controller/PController

A2

A1

A0

GND

SMBUS/I

2

C

Figure 7-1. LP3943 Typical Application

2.1 Design Requirements

For typical RGB LED light-driver applications, use the parameters listed in Table 7-1.

Table 7-1. Design Parameters

DESIGN PARAMETER

EXAMPLE VALUE

Minimum input voltage

2.3 V

Typical output voltage

5 V

Output current

20 mA

LP3943

SNVS256E – NOVEMBER 2003 – REVISED OCTOBER 2024

www.ti.com

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