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BCT3220 Datasheet Preview

BCT3220 Datasheet

4 Channel LED Driver

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November, 2008, REV2.0
BCT3220
4 Channel LED Driver (Common-Anode & Common-Cathode)
Low Dropout Current Source & Current Sink
General Description
The BCT3220 is a high performance white
LED driver. The BCT3220 uses an internal
resistor to set the bias current for four LEDs,
which are matched to +/-1.5%. The BCT3220'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 BCT3220 requires
only a 50mV dropout voltage at a 20mA load on
each output to match the LED brightness.
By using one SEL pin, the BCT3220 can
support to drive 4 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
<2% LED Current Matching (TYP)
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, DFN-8L Package
Applications
Cell Phones
PDAs
Digital Cameras, Camcorders
Portable Instrumentation
Battery Powered Equipment
Pin Configurations (Top View)
DFN2x2-8L Package
www.broadchip.com




BROADCHIP

BCT3220 Datasheet Preview

BCT3220 Datasheet

4 Channel LED Driver

No Preview Available !

November, 2008, REV2.0
4 Channel LED Driver (Common-Anode & Common-Cathode)
Ordering Information
PART
PIN-PACKAGE
BCT3220ELA-TR DFN2x2-8L
Temp-Range
-40°C to +85°C
Top Mark Supplied as:
BCT3220 3000units/Tape & Reel
Functional Pin Description
Pin Name
Function
1 D1 LED Pin1, leave it NC if unused.
2 D2 LED Pin2, leave it NC if unused.
3 D3 LED Pin3, leave it NC if unused.
4 D4 LED Pin4, leave it NC if unused.
5 GND Ground
6
SEL
When SEL is Low, it’s a Co-Anode LED driver (see Figure 1).
When SEL is High, it’s a Co-Cathode LED driver (see Figure 2).
7 EN Chip Enable (Active High), and connects to GPIO pin of MCU.
8 VIN Input voltage
Typical Application Circuit
Figure 1: Application Circuit for Co-Anode Connection.
www.broadchip.com


Part Number BCT3220
Description 4 Channel LED Driver
Maker BROADCHIP
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BCT3220 Datasheet PDF






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