SP6685 Datasheet, PDF (4/14 Pages) Sipex Corporation – Charge Pump LED Driver For Camera Flash

SP6685
700mA Buck/Boost Charge Pump LED Driver
PIN DESCRIPTION
Name
V_IN
C1
C2
FLASH
EN
R_SET
FB
S_GND
P_GND
V_OUT
Pin Number
1
2
3
4
5
6
7
8
9
10
Description
Input voltage for the charge pump. Decouple with 4.7µF ceramic capacitor close to the
pins of the IC.
Positive input for the external fly capacitor. Connect a ceramic 1µF capacitor close to
the pins of the IC.
Negative input for the external fly capacitor. Connect a ceramic 1µF capacitor close to
the pins of the IC.
Logic input to toggle between FLASH and TORCH mode. In TORCH Mode FB is regulated
to the internal 50mV reference. In FLASH Mode FB reference voltage can be adjusted by
changing the resistor from R_SET pin to ground. Choose the external current sense
Resistor (R_SENSE) based on desired current in TORCH Mode.
Shutdown control input. Connect to V_IN for normal operation, connect to ground for
shutdown.
Connect a resistor from this pin to ground. When in FLASH Mode (FLASH = High) this
resistor sets the current regulation point according to the following:
V_FB = (1.26V/R_SET)*11.2KΩ
Feedback input for the current control loop. Connect directly to the current sense
resistor.
Internal ground pin. Control circuitry returns current to this pin.
Power ground pin. Fly capacitor current returns through this pin.
Charge Pump Output Voltage. Decouple with an external capacitor. At least 1µF is
recommended. Higher capacitor values reduce output ripple.
ORDERING INFORMATION
Part Number
SP6685ER-L
SP6685ER-L/TR
SP6685EB
Temperature
Range
Marking
SP66
-40°C≤T_A≤+85°C
85ER
WWX
-40°C≤T_A≤+85°C
SP66
85ER
WWX
SP6685 Evaluation Board
“WW” = Work Week – “X” = Lot Number
Package
DFN-10
Packing
Quantity
Bulk
Note 1
RoHS Compliant
Halogen Free
DFN-10
3K/Tape & Reel
RoHS Compliant
Halogen Free
Note 2
© 2009 Exar Corporation
4/14
Rev. 2.0.0