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XRP6840AILBTR-F Datasheet(PDF) 3 Page - Exar Corporation

Part # XRP6840AILBTR-F
Description  4.3A Supercapacitor Flash LED Driver with I2C
Download  17 Pages
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Manufacturer  EXAR [Exar Corporation]
Direct Link  http://www.exar.com
Logo EXAR - Exar Corporation

XRP6840AILBTR-F Datasheet(HTML) 3 Page - Exar Corporation

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XR
RP
P6
68
84
40
0
4
4..3
3A
A S
Su
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pe
errcca
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orr F
Flla
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D D
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wiitth
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© 2009 Exar Corporation
3/17
Rev. 1.0.0
Parameter
Min.
Typ.
Max.
Units
Conditions
Channel to Channel Current
Matching
-3
3
%
0mA < ILED < 1.6A Per Channel, Note 3
Switching Frequency
2.0
2.4
2.8
MHz
Equivalent Resistance, 1X Mode
0.5
VIN = 3.7V, IOUT = 200mA
Equivalent Resistance, 1.5X
Mode
4
7
VIN = 3.2V, VOUT < VOUT_LIMIT,
IOUT = 200mA, Equivalent resistance =
[(VIN x 1.5) - VOUT] / IOUT
LEDx Pin Dropout Voltage
0.36
V
Flash mode, VIN = 3.4V, ILED = 1A,
Measure LED current at 95% ILEDX-NOMINAL
at VLEDX=0.8V
LEDx Pin Dropout Voltage
0.1
V
Torch mode, VIN = 3.4V, ILED = 80mA,
Measure LED current at 95% ILEDX-NOMINAL
at VLEDX=0.8V
LED Short Detect Threshold
0.1
0.2
0.4
V
VOUT – VLED, LED = 0mA for all DAC code
Thermal Regulation
0.01
%/oC
Thermal Shutdown Temperature
150
oC
Driver turn OFF
Thermal Shutdown Hysteresis
10
oC
Driver turn ON
Output Voltage Regulation (OVR)
5.2
5.3
5.4
V
Flash Mode, ILED = 0mA, VOUT Rising
STATUS2 Register: [B7 B6 B5] = 101
OVR value is set by STATUS2 register
between 4.55V – 5.6V, all setting have
+/- 100mV tolerance
Output Voltage Regulation
Hysteresis
50
mV
Flash Mode, ILED = 0mA
RDY Pin Output Trip Threshold
VO – 0.1
V
STATUS2 Register: [B7 B6 B5] = 101
100mV below actual OVR value.
RDY Pin Sink Current
1
mA
SDA, SCL, RESET_N, FLASH
Input Logic Low Voltage
0.4
V
SDA, SCL, RESET_N, FLASH
Input Logic High Voltage
1.6
V
Turn-Off Time (TOFF) Into
Shutdown
50
µs
RDY goes low when RESET_N goes from
high top low
Flash Time Duration Before
Standby
0.09
0.11
0.13
s
STATUS1 register [B1 B0]=00
0.18
0.22
0.26
s
STATUS1 register [B1 B0]=01
0.43
0.53
0.63
s
STATUS1 register [B1 B0]=10
0.9
1.1
1.3
s
STATUS1 register [B1 B0]=11
I2C SPECIFICATIONS
I2C ADDRESSING FORMAT
S
XRP6840
Address
R/W
A
Status
Data
A
LED1 Data
A
LED2 Data
A
LED3 Data
A
SP
7-bit
1/0
8-bit
8-bit
8-bit
8-bit
Fig. 2: I2C Data Input Format
Start Condition
Acknowledgement
sent by the slave
Acknowledgement
- sent by the slave when R/W =0
- sent by master when R/W =1
Stop Condition


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