SC606 Datasheet, PDF (1/18 Pages) Semtech Corporation – Low Noise Smart LED Driver with Serial Interface

POWER MANAGEMENT
Description
SC606
Low Noise Smart LED
Driver with Serial Interface
Features
The SC606 is a very high efficiency charge pump white/color LED
driver from the mAhXLife^TM family of products. It is optimized for
Li-Ion battery applications. The LED current is regulated to a value
configured by the user through an I²C compatible serial interface.
LED outputs are current-matched for consistent LED brightness.
Up to 6 LEDs are controlled in three zones for brightness control in
multiple displays. The 6 LED outputs are divided into 3 pairs of
LEDs. Each pair has current that is programmable independent of
the other pairs. Any combination of LEDs may be turned on using
the serial interface. The SC606 also has a float detect feature
that disables any current driver during normal operation when an
open-load condition is detected.
Patented low noise switching circuitry and constant output current
allow the use of extremely small input and output capacitors.
Very High Efficiency Over 90% of Battery Life
Current Regulation for 6 LEDs
Current Matching Tolerance of +/- 3.5% from LED to LED
Current Accuracy to +/- 6.5% of Specified Value
Current Range per LED [0.5mA - 32mA]
High Available Total LED Current = 6 I = 120mA
LED
I²C Bus Limited Compatibility SC606
Low Shutdown Current: 0.1μA Typical
Soft-Start /In-rush Current Limiting
Short Circuit /Thermal Protection
MLP-16 [4x4] Package
1.33MHz and 250kHz Programmable Fixed Frequency
Separate Brightness Zones for Multiple Displays
Three Charge Pump Modes of Operation: 1x, 1.5x and 2x
Open LED Output Protection
Applications
Typical Application Circuit
Cellular Phones
LED Backlighting
PDA Power Supplies
Portable Devices
Patent Pending
Electronic Books
Wireless Web Appliances
D2
D3
D4
D5
D1
SDA
SCL
EN
1
ILEDA1
2
SDA
3
SCL
4 _EN
SC606
12
ILEDC2
11
GND
10
C2+
9
C2-
D6
C2
1µF
August 31, 2006
C1
1µF
C3
1µF
C4
VBAT
1µF
1
United States Patents: 6,504,422, 6,794,926
www.semtech.com