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Exar Corporation

XRP7620 Datasheet Preview

XRP7620 Datasheet

4-Channel Adjustable Current I2C Controlled LED Driver

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June 2009
XRP7620
4-Channel Adjustable Current I2C Controlled LED Driver
Rev. 1.0.0
GENERAL DESCRIPTION
The XRP7620 is a multi purpose 4-channel
independently adjustable current sink driver.
Optimized for LED backlighting and
RGBW/RGBA color mixing applications, the
XRP7620 can also be used as a generic
software programmable current sink I/O
expander.
Supporting an industry standard 2-wire I2C
serial interface, the XRP7620 provides full
independent control of each channel and can
be programmed up to a current of 31.5mA in
steps of 0.5mA. Uniform display brightness is
ensured through better than 3% channel to
channel current matching.
Five internal registers are provided to set
operational configuration and individual
channel current programmation. A specific
shutdown mode allows the device to retain the
previously loaded configuration – operational
and current programming – in order to be
reused upon the next enabling.
The XRP7620 is designed to operate from a
single cell lithium-ion battery or fixed 3.3V or
5.0V power rails and is available in a RoHS
compliant, “green”/halogen free space saving
8-pin 2mmx3mm DFN package.
APPLICATIONS
LCD Display & Keypad Backlighting
Color Coded Indicator Lighting
RGBW/RGBA Color Mixing
Cell Phones & Handheld Devices
Generic Current Sink I/O Expander
FEATURES
4-Channel LED Current Sink Driver
Individual Channel Current Control
Up to 31.5mA per channel / 0.5mA Steps
100mV Channel Dropout Voltage
I2C Serial Interface
2.7V - 5.5V Input Voltage Range
3% Channel Current Matching
Register Retention in Shutdown
Shutdown Current <1µA
Thermal and UVLO Built-in Protection
RoHS Compliant, “Green”/Halogen
Free 2x3mm 8-Pin DFN package
www.DaTtaYSPheIeCt4UA.cLomAPPLICATION DIAGRAM
Fig. 1: XRP7620 Application Diagram
Exar Corporation
48720 Kato Road, Fremont CA 94538, USA
www.exar.com
Tel. +1 510 668-7000 – Fax. +1 510 668-7001




Exar Corporation

XRP7620 Datasheet Preview

XRP7620 Datasheet

4-Channel Adjustable Current I2C Controlled LED Driver

No Preview Available !

XRP7620
4-Channel Adjustable Current I2C Controlled LED Driver
ABSOLUTE MAXIMUM RATINGS
These are stress ratings only and functional operation of
the device at these ratings or any other above those
indicated in the operation sections of the specifications
below is not implied. Exposure to absolute maximum
rating conditions for extended periods of time may affect
reliability.
VIN, SDA, SCL, LEDx .................................. -0.3V to 6.0V
Storage Temperature .............................. -65°C to 150°C
Power Dissipation ................... Internally Limited (Note 1)
Lead Temperature (Soldering, 10 sec) ................... 300°C
ESD Rating (Human Body Model) ............................. 2kV
OPERATING RATINGS
Input Voltage Range VIN...............................2.7V to 5.5V
Junction Temperature Range ....................-40°C to 100°C
Thermal Resistance θJA ...................................... 59°C/W
ELECTRICAL SPECIFICATIONS
Specifications with standard type are for an Operating Junction Temperature of TJ = 25°C only; limits applying over the full
Operating Junction Temperature range are denoted by a “•”. Minimum and Maximum limits are guaranteed through test,
design, or statistical correlation. Typical values represent the most likely parametric norm at TJ = 25°C, and are provided for
reference purposes only. Unless otherwise indicated, VIN = 2.7V to 4.6V, CIN = 1µF, TA= –40°C to 85°C, TJ = –40°C to
100°C.
Parameter
Operating Input Voltage Range
Operating Input Current
DAC=000000
Operating Input Current
LED Current accuracy
(includes Line Regulation)
LED Current Matching
Line Regulation
www.DaCtauSrrheenett4DUA.cComResolution
Current for DAC=000000
Current for DAC=000001
Maximum LED Current
DAC=111111
Min.
2.7
-0.3
-5
-8
-3
0.35
30.50
Maximum Current Change
Settling Time
Current Source Dropout Voltage
Shutdown Supply Current
Shutdown Supply Current
Thermal Shutdown Die
Temperature
125
Typ.
30
450
6
0.50
31.75
60
0.1
0.01
150
Max.
5.5
50
600
0.3
5
8
3
1
2
0.65
33.00
2
150
0.15
1
5
175
Units
V
µA
µA
mA
%
%
%
%/V
Bit
µA
mA
mA
µs
µs
V
µA
µA
°C
Conditions
• ILEDX=0, VIN=4.2V
• ILED1=ILED2=ILED3=ILED4=10mA, VIN=4.2V
VLED = 0.2V to 2.7V
ILEDX 6mA
VLED = 0.2V to 2.7V
ILEDX > 6mA
For same DAC setting
VLED = 0.2V to 2.7V, Note 2
Measured as ΔIOUT /IOUT_AVG /ΔV
VLED = 0.2V to 2.7V, Note 3
• Applies to all LEDs
Applies to all LEDs
Applies to all LEDs
For changes between any DAC code
000001 and higher. Current must change
within this time after the last bit of LED
data. VIN=2.7 to 5.5V
Applies to changes between DAC code
000000 and higher or change from 0 to 1
for STATUS bits B5-B2 (channel enable).
Current must change within this time
after the last bit of LED data. VIN=2.7 to
5.5V
ILED=20mA;
The voltage where LED current decreases
3% from nominal value at VLED = 1V.
VIN=2.7 to 5.5V
VIN=4.2V
VIN=4.2V, TA=85°C
Regulator turns off
© 2009 Exar Corporation
2/11
Rev. 1.0.0


Part Number XRP7620
Description 4-Channel Adjustable Current I2C Controlled LED Driver
Maker Exar Corporation
Total Page 11 Pages
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