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XRP6840BILBTR-F Datasheet(PDF) 6 Page - Exar Corporation

Part # XRP6840BILBTR-F
Description  4.3A Supercapacitor Flash LED Driver with I2C
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Manufacturer  EXAR [Exar Corporation]
Direct Link  http://www.exar.com
Logo EXAR - Exar Corporation

XRP6840BILBTR-F Datasheet(HTML) 6 Page - Exar Corporation

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© 2009 Exar Corporation
6/17
Rev. 1.0.0
PIN DESCRIPTION
Name
Pin Number
Description
CGND
1
Charge pump ground pin.
RDY
2
Active high push-pull output. RDY is high when VOUT reached to 100mV below its
VOUT_LIMIT voltage. The VOUT_LIMIT for Flash mode is determined by STATUS2 register [B7
B6 B5]. The VOUT_LIMIT for Torch mode is 4.50V.
SCL, SDA
3, 4
The SDA and SCL pins connect to the I2C bus. Multiple functions can be programmed
through his interface. They can also be used for read-back.
PGND
5, 11
Power ground pin. The Source of internal NMOS is connected to this pin.
RESET_N
6
Active Low input pin.
If RESET_N = 0, then XRP6840 is in Shut-down mode
If RESET_N = 0 and STATUS1 register [B5] = 0, then reset all registers to logic low.
If RESET_N = 0 and STATUS1 register [B5] = 1, then all bits of all registers will be
saved.
LED1, LED2, LED3
(XRP6840A)
7, 8, 9
LED1, LED2, LED3 connect to the drain of the internal NMOS which are current sources
for LED current. These current sources are controlled by LEDFLASH or LEDTORCH
registers which is programmed through I2C to provide the Torch and Flash current for
the LEDs. LED1, LED2, LED3 pins can be connected together to provide higher LED
current. If a pin is not used connect it to VOUT. The XRP6840 incorporates a short LED
protection circuit which shut-down LED current if LED voltage approaches to VOUT_LIMIT.
LED1, NC, LED2
(XRP6840B)
7, 8, 9
FLASH
10
Digital Input pin. Active high. If STATUS1 register [B7 B6] = 11 and FLASH = 1 then
LEDs are ON for one Flash timeout duration. Flash Timeout duration is controlled by
STATUS1 register [B1 B0].
NC
12
No connection. This pin can be connected to PGND pin for heat sink.
GND
13
Ground pin. This ground pin doesn’t carry high internal current.
CAP
14
This pin is the output of an internal Op-Amp. This internal Op-Amp is powered by VOUT.
The output voltage is half of VOUT, and output resistance is 470Ω. The sink and source
current is limited by 470Ω output resistance. This provides active balancing between
two internal sections of the super capacitor.
VOUT
15
Output voltage. Connect positive terminal of SuperCap here. Connect the LEDs
between this pin and the corresponding internal current source. Decouple with 10µF
ceramic capacitor close to the pins of the IC.
C2P, C2N
16, 17
Connect C2 external flying capacitor between these pins.
C1P, C2P
18, 19
Connect C1 external flying capacitor between these pins.
VIN
20
Power supply input. Decouple with 10µF ceramic capacitor close to the pins of the IC.
Thermal Pad
-
Connect thermal pad to PGND pins.
ORDERING INFORMATION
Part Number
Junction
Temperature
Range
Marking
Package
Packing
Quantity
Note 1
Note 2
XRP6840AILB-F
-40°C≤TA≤+125°C
6840AI
YYWWX
20-pin TQFN
Bulk
RoHS Compliant/
Halogen Free
3 Channels
XRP6840AILBTR-F -40°C≤TA≤+125°C
6840AI
YYWWX
20-pin TQFN
3K/Tape & Reel
RoHS Compliant/
Halogen Free
3 Channels
XRP6840BILB-F
-40°C≤TA≤+125°C
6840BI
YYWWX
20-pin TQFN
Bulk
RoHS Compliant/
Halogen Free
2 Channels
XRP6840BILBTR-F -40°C≤TA≤+125°C
6840BI
YYWWX
20-pin TQFN
3K/Tape & Reel
RoHS Compliant/
Halogen Free
2 Channels
XRP6840EVB
XRP6840 Evaluation Board – XRP6840A based.
“YY” = Year – “WW” = Work Week – “X” = Lot Number


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