SN3103
Jun 2010 R1.0 SI-EN Technology 1
Six-Channel RGB LED Driver
Description
The SN3103 is a constant current LED driver featuring
One Shot Programming mode and Interface Intensity
Control mode for RGB lighting effects.
Each output of the SN3103 is a constant current sink
pulse width modulated in 256 steps. The output current is
user selectable to be one of 5 levels, 17.5mA, 28.5mA,
38.9mA, 46.5mA or 69.5mA (Typ.). At 38.9mA the
SN3103 outputs require only 0.4V of headroom voltage.
In One Shot Programming mode, the timing
characteristics for output current - Gamma corrected
current ramping up, holding, Gamma corrected ramping
down and off time, can be adjusted individually so that
each output can independently maintain a pre-established
pattern without requiring any additional interface activity,
thus saving valuable system resources.
In Interface Intensity Control mode, the PWM duty cycle
of each output can be independently programmed and
controlled in 256 steps to simplify color mixing.
Features
6 independently controlled outputs of 256 steps
PWM RGB LED drivers
Changing Intensity of Color LEDs with two modes:
-One Shot Programming Mode with Gamma
correction
-Interface Intensity Control Mode
Programmable output current level settings
For anode-common LEDs
SPI interface
Supply voltage range: 3.0V to 5.5V
Operating temperature range T
A
= −40°C ~ +85°C
Package: QFN-20, 4mm × 4mm
Application
Cellular phones
MP3/MP4/CD/minidiskplayers
Digital Picture Frame/Toy
T ypical Application Circuit
Figure 1 Typical Application Circuit
SN3103
Jun 2010 R1.0 SI-EN Technology 2
Pin Configuration
Package Pin Configuration (Top View)
QFN-20
20
19
18
6
7
8
9
10
17
16
NC
NC
GND
NC
NC
SDI
SCK
GND
SDB
VDD
Pin Description
No. Pin I/O Description
1~3, 11~13 OUT0 ~ OUT5 O LED outputs.
4~7,9,10 NC
-
No connection.
15
CS
_____
I Active low chip select for serial communications.
16 SDI I/O Input serial data for data shift resister.
17 SCK I Input Clock for data shift on rising edge.
8, 18 GND
-
Ground.
19 SDB I Shutdown, pull to GND in the shutdown mode.
20 VDD
-
Power supply.
Thermal Pad
-
Connect to GND.
Ordering Information
Order Number Package Type QTY/Reel Operating Temperature Range
SN3103I420E QFN-20 2500
-40°C ~ +85°C
SN3103 □ □ □ □
Lead Free Code
E: Lead Free
Pin Code
20: 20 Pins
Package Type
4: QFN, 4mm × 4mm
Operating Temperature Range
I: Industrial, -40°C ~ +85°C