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X R P 6 8 4 0
4 . 3 A S u p e r c a p a c i t o r F l a s h L E D D r i v e r w i t h I 2 C
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
OPERATING RATINGS
Input Voltage Range V IN ............................... 2.7V to 5.5V
Junction Temperature Range ....................-40°C to 125°C
Thermal Resistance θ JA ................................... 30.8°C/W
rating conditions for extended periods of time may affect
reliability.
V IN , V OUT , LED 1 , LED 2 , LED 3 .......................... -0.3V to 6.0V
SCL, SDA, RDY, RESET_N, CAP ............ -0.3V to V IN +0.3V
C1P, C2P, C1N, C2N ........................... -0.3V to V IN +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
ELECTRICAL SPECIFICATIONS
Specifications with standard type are for T J = 25°C only; limits in applying over the full Operating Junction Temperature (T J )
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 T J = 25°C, and are provided for reference purposes only. Unless
otherwise indicated, V IN = 3.4V, V LED = 0.8V, C IN = 47μF, C F1 = C F2 = 0.47μF, C OUT1 (V OUT to CAP) = 47μF and C OUT2 (CAP to
GND) = 47μF. T A = –40°C to 85°C, T J = –40°C to 125°C.
Parameter
Operating Input Voltage Range
Min.
2.7
Typ.
Max.
5.5
Units
V
?
Conditions
UVLO Turn-On Threshold
2.2
2.4
2.6
V
?
V IN rising
UVLO Hysteresis
100
mV
V IN falling
Operating Input Current
Including In-rush Current
Torch Mode Input Current
Torch Mode Input Current
Standby Input Current
Shutdown Supply Current
Shutdown I LED Current
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
600
202
302
30
1
0
20
30
200
300
300
440
4.3
3
4
725
228
340
40
3
10
12
18
mA
mA
mA
μA
μA
mA
mA
mA
mA
mA
mA
mA
A
Bit
Bit
%
mA
mA
?
?
?
?
1x, 1.5x or 2x Mode
1x Mode, I OUT = 200mA
1.5x Mode, I OUT = 200mA
All LEDs are Off, T J(max) = 85 o C
R ESET_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 < I LED < 1.6A for XRP6840A
180mA < I LED < 1.6A for XRP6840B
I LED ≤ 120mA, XRP6840A
I LED ≤ 180mA, XRP6840B
? 2009 Exar Corporation
2/17
Rev. 1.0.0
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