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BCT3228 Datasheet Preview

BCT3228 Datasheet

8 Channel LED Driver

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August , 2011, REV1.0
BCT3228 preliminary
8 Channel LED Driver (Common-Anode & Common-Cathode)
Low Dropout Current Source & Current Sink
General Description
The BCT3228 is a high performance 8 channel
white LED driver. The BCT3228 uses two
internal resistor to set the bias current for four
LEDs. The BCT3228's advantages over ballast
resistors include much lower bias variation with
supply voltage variation, significantly lower
dropout voltage, and in some applications,
significantly improved efficiency. The BCT3228
requires only a 50mV dropout voltage at a
20mA load on each output to match the LED
brightness.
By using two SEL pin, the BCT3228 can
support to drive 8 parallel Co-Anode or
Co-Cathode white LEDs and regulates a
constant current for uniform intensity.
Users can easily configure the LED current
from 2.5mA to 20mA by a serial pulse. The
dimming of white LEDs current can be
achieved by applying a pulse signal to the EN
pin. There are totally 8 steps of current could be
set by users. Internal soft start circuitry
effectively reduces the in-rush current while
both start-up and mode transition.
Features
Drive Common Anode or Common
Cathode LEDs
Low 50mV Dropout at 20mA
20mA full scale current
One Wire interface for 8-Step Brightness
Control
2.7V to 5.5V Supply Voltage Range
Thermal Shutdown Protection
Low Input Noise and EMI
RoHS Compliant and 100% Lead
(Pb)-Free, QFN-24L Package
Applications
Cell Phones
PDAs
Digital Cameras, Camcorders
Portable Instrumentation
Battery Powered Equipment
Pin Configurations (Top View)

QFN4x4-24L Package

www.broadchip.com




BROADCHIP

BCT3228 Datasheet Preview

BCT3228 Datasheet

8 Channel LED Driver

No Preview Available !

August , 2011, REV1.0
8 Channel LED Driver (Common-Anode & Common-Cathode)
Ordering Information
PART
PIN-PACKAGE
BCT3228EGG-TR QFN4x4 -24L
Temp-Range
-40°C to +85°C
Top Mark Supplied as:
3228
3000units/Tape & Reel
Functional Pin Description
Pin
1
2
3
4
5
6
7
8,9,10,11,
12
13
14
15
16
17
18
19,20,21,
22,23
24
25
Name
D2
D3
D4
D5
D6
D7
D8
NC
SEL2
EN2
VIN2
SEL1
EN1
VIN1
NC
D1
GND
Function
LED Pin2, leave it NC if unused.
LED Pin3, leave it NC if unused.
LED Pin4, leave it NC if unused.
LED Pin5, leave it NC if unused.
LED Pin6, leave it NC if unused.
LED Pin7, leave it NC if unused.
LED Pin8, leave it NC if unused.
No Connect
Select Pin, use for decide D5~D8 driver mode.
When SEL2 is Low, it’s a Co-Anode LED driver (see Figure 1).
When SEL2 is High, it’s a Co-Cathode LED driver (see Figure 2).
Chip Enable (Active High), and connects to GPIO pin of MCU.
Use for control D5~D8
Input voltage
Select Pin, use for decide D1~D4 driver mode.
When SEL1 is Low, it’s a Co-Anode LED driver (see Figure 1).
When SEL1 is High, it’s a Co-Cathode LED driver (see Figure 2).
Chip Enable (Active High), and connects to GPIO pin of MCU.
Use for control D1~D4
Input voltage
No Connect
LED Pin1, leave it NC if unused.
Ground
www.broadchip.com


Part Number BCT3228
Description 8 Channel LED Driver
Maker BROADCHIP
PDF Download

BCT3228 Datasheet PDF






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