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PDF SC620 Data sheet ( Hoja de datos )
| Número de pieza | SC620 | |
| Descripción | Octal LED Driver | |
| Fabricantes | Semtech Corporation | |
| Logotipo |  |
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Hay una vista previa y un enlace de descarga de SC620 (archivo pdf) en la parte inferior de esta página. Total 18 Páginas | ||
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SC620
Octal LED Driver, General Purpose
Current Sink with Serial Interface
POWER MANAGEMENT
Features
Wide current setting range — 31.25μA to 25mA
Eight identical current drivers with independent
control
5% current matching, 7% accuracy
I2C interface for microprocessor control
I2C slave address 1110 000x
Less than 1μA quiescent current in shutdown
Low dropout voltage — ≤ 150mV
Over-temperature protection
MLPQ-UT-16 package (3mm x 3mm)
Ultra-thin 0.6mm maximum package height
Fully WEEE and RoHS compliant
Applications
LCD backlighting LED driver
Multicolor and RGB LED driver
General purpose current sink array
General purpose digital output (open-drain) expander
Auto-focus voice-coil driver
Description
The SC620 is a multi-purpose LED driver with eight identi-
cal, independently controlled current sinks. Each current
sink can drive an LED by connecting the LED’s anode to
the system power supply and the cathode to the current
sink input pin. Any combination of outputs can be enabled
or disabled for optimal design flexibility.
The SC620 also employs an adjustable global current gain
setting register to allow the current setting step size to
vary from 31.25μA to 500μA. This provides a wide range of
options for LED variation and dimming functions. The
maximum output is also scaled by this step size, with a
maximum of 25mA at the highest step setting.
Multi-colored and white LEDs with different forward volt-
ages can be driven using the same SC620 due to its float-
ing cathode technology. This feature allows each output
pin to vary in voltage from 150mV to V - 1.5V.
IN
All current control is programmed using an I2C interface
bus. Only a single input bypass capacitor is required — no
other external resistors or capacitors are needed. The 3mm
x 3mm MLPQ package and minimal support components
make the SC620 an ideal solution for low-cost, area-con-
scious backlighting designs.
www.DataSheet4U.com
Typical Application Circuit
Battery
1μF
SCL
SDA
EN
SC620
IN ILED1
SCL ILED2
SDA
ILED3
EN ILED4
GND
ILED5
GND
ILED6
GND
ILED7
GND
ILED8
LED Backlighting
Main Panel
Sub Panel Color/R/G/B LEDs
December 19, 2007
© 2007 Semtech Corporation
1
1 page  
SC620
Electrical Characteristics (continued)
Parameter
Symbol
Condition
Min Typ Max Units
I2C Timing (continued)
Bus-Free Time Between
STOP and START
t
BUF
Interface Start-up Time
Bus Start-up Time After EN Pin is
t
EN Pulled High
Notes:
(1) Current step size = 500μA - See Table 1 for other step size options.
(2) Outputs are disabled but I2C bus is active
(3) Current gain register set to maximum value - see Control Register section for details.
(4) Current gain register set to minimum value - see Control Register section for details.
(5) Guaranteed by design.
1.3
μs
350 μs
www.DataSheet4U.com
5
5 Page 
SC620
Applications Information (continued)
Application Circuit Examples
Main Backlight Plus Sub-panel Backlight Plus Single
RGB LED
This example uses the SC620 to drive a main display, a
sub-panel display, and an RGB LED. Independent outputs
allow these functions to be supported simultaniously at
different intensities. The VIN supply is typically single cell
Li-Ion or 5.0V. V supply and LED anode voltage may
IN
be from different sources. The operating voltage limit of
(V — 1.5V) at the sink pins must be observed to achieve
IN
the specified accuracy of the device.
Battery
LED Backlighting
Main Panel
Sub Panel Color/R/G/B LEDs
1μF
SCL
SDA
EN
www.DataSheet4U.com
2 IN
SC620
ILED1
5
11 SCL
ILED2 6
10 SDA
ILED3 7
3 EN
ILED4 8
1 GND
ILED5 13
4 GND
ILED6 14
9 GND
ILED7 15
12 GND
ILED8 16
11
11 Page | ||
| Páginas | Total 18 Páginas | |
| PDF Descargar | [ Datasheet SC620.PDF ] | |
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