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Exar Corporation

XRP6840 Datasheet Preview

XRP6840 Datasheet

4.3A Supercapacitor Flash LED Driver

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December 2009
XRP6840
4.3A Supercapacitor Flash LED Driver with I2C
Rev. 1.0.0
GENERAL DESCRIPTION
The XRP6840 is a controlled-current dual-cell
supercapacitor charger and high power LED
driver. Operating from a standard lithium-ion
battery, the XRP6840 provides up to 4.3A of
programmable Flash LED current and up to
600mA and 5.6V of programmable
supercapacitor charging current and voltage.
Architectured around a 2.4MHz tri-mode 1x,
1.5x and 2x charge pump, the XRP6840
charges the stacked supercapacitor to the
programmed output voltage with no more
than 600mA drawn from the battery. While
charging, an internal active balance circuitry
insures matching of the stacked capacitors’
voltages.
A standard 2-line I2C serial interface allows
the dynamic programming of LED currents in
torch and flash modes, flash timeout, channel
enable, gain control, capacitor charge voltage,
and enable. The XRP6840 comes in a 2 and 3
channel version supporting respectively
440mA/2.15A per channel and 300mA/1.45A
in torch/flash modes.
The flexibility designed into the XRP6840 can
also allow it to reverse the power flow back to
the input to prevent unintended system resets
as the battery voltage drops.
The XRP6840 is available in a lead-free,
“green”/halogen free 20-pin TQFN package.
APPLICATIONS
High Power Torch/Strobe/Flash LED
High Resolution Cameras
Generic High Power Lighting
High Power White LED Backlighting
FEATURES
Programmable 4.3A Flash LED Driver
Torch and Flash Modes
2 and 3 Channels Versions
Programmable Supercapacitor Charger
600mA Adjustable Charging Current
Programmable Supercapacitor Voltage
In-rush Current Control
Active Voltage Balance Control
Tri-mode Charge Pump Architecture
1x, 1.5x, 2x Operation Modes
2.4MHz Switching Frequency
I2C Serial Interface
Thermal, Over Current and Output
Short Protection
LED Short Detection
RoHS Compliant “Green”/Halogen Free
20-pin 4mmx4mm TQFN package
TYPICAL APPLICATION DIAGRAM
Fig. 1: XRP6840 – 3 Channels 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

XRP6840 Datasheet Preview

XRP6840 Datasheet

4.3A Supercapacitor Flash LED Driver

No Preview Available !

XRP6840
4.3A Supercapacitor Flash LED Driver with I2C
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, VOUT, LED1, LED2, LED3.......................... -0.3V to 6.0V
SCL, SDA, RDY, RESET_N, CAP ............-0.3V to VIN +0.3V
C1P, C2P, C1N, C2N ...........................-0.3V to VIN +0.3V
Storage Temperature .............................. -65°C to 150°C
Power Dissipation ................... Internally Limited (Note 1)
Lead Temperature (Soldering, 10 sec) ................... 260°C
ESD Rating (HBM - Human Body Model) All Pins ......... 2KV
OPERATING RATINGS
Input Voltage Range VIN...............................2.7V to 5.5V
Junction Temperature Range ....................-40°C to 125°C
Thermal Resistance θJA ................................... 30.8°C/W
ELECTRICAL SPECIFICATIONS
Specifications with standard type are for TJ = 25°C only; limits in applying over the full Operating Junction Temperature (TJ)
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 = 3.4V, VLED = 0.8V, CIN = 47µF, CF1 = CF2 = 0.47µF, COUT1 (VOUT to CAP) = 47µF and COUT2 (CAP to
GND) = 47µF. TA= –40°C to 85°C, TJ = –40°C to 125°C.
Parameter
Operating Input Voltage Range
UVLO Turn-On Threshold
UVLO Hysteresis
Operating Input Current
Including In-rush Current
Torch Mode Input Current
Torch Mode Input Current
Standby Input Current
Shutdown Supply Current
Shutdown ILED Current
Min.
2.7
2.2
Torch Mode Incremental current
Step
Flash Mode Incremental current
Step
Maximum Current in Torch Mode
per Channel
Maximum Current in Flash Mode
Output Current DAC Resolution
DAC Current Accuracy
-10
-12
-18
© 2009 Exar Corporation
Typ.
2.4
100
600
202
302
30
1
0
20
30
200
300
300
440
4.3
3
4
Max.
5.5
2.6
725
228
340
40
3
10
12
18
Units
V
V
mV
mA
mA
mA
µA
µA
mA
mA
mA
mA
mA
mA
mA
A
Bit
Bit
%
mA
mA
2/17
• VIN rising
VIN falling
Conditions
• 1x, 1.5x or 2x Mode
1x Mode, IOUT = 200mA
1.5x Mode, IOUT = 200mA
All LEDs are Off, TJ(max) = 85oC
RESET_N = 0V
STATUS1 Register [B7 B6] =00
Measure LED1 – LED3
XRP6840A, Table 6, averaged from all
channels
XRP6840B, Table 6, averaged from all
channels
XRP6840A, Table 5, averaged from all
channels
XRP6840B, Table 5, averaged from all
channels
XRP6840A, Note 2, averaged from all
channels
XRP6840B, Note 2, averaged from all
channels
Flash Mode, Measured current into all LED
pins
Flash Mode
Torch Mode
120mA < ILED < 1.6A for XRP6840A
180mA < ILED < 1.6A for XRP6840B
• ILED 120mA, XRP6840A
• ILED 180mA, XRP6840B
Rev. 1.0.0


Part Number XRP6840
Description 4.3A Supercapacitor Flash LED Driver
Maker Exar Corporation
Total Page 17 Pages
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