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SP7685 Fiches technique(PDF) 3 Page - Sipex Corporation

No de pièce SP7685
Description  1.2A Buck/Boost Charge Pump LED Driver
Download  12 Pages
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Fabricant  SIPEX [Sipex Corporation]
Site Internet  http://www.sipex.com
Logo SIPEX - Sipex Corporation

SP7685 Fiches technique(HTML) 3 Page - Sipex Corporation

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Date: 6/20/06 Rev T
SP7685, 1.2A Buck/BoostCharge Pump LED Driver
© 2006 Sipex Corporation
PIN DESCRIPTION
PIN
NUMBER
PIN NAME
DESCRIPTION
1VIN
Input Voltage for the charge pump. Decouple with
4.7µF ceramic capacitor close to the pins of the IC.
2C1
Positive input for the external flying capacitor. Connect
a ceramic 1µF capacitor close to the pins of the IC.
3C2
Negative input for the external flying capacitor. Connect
a ceramic 1µF capacitor close to the pins of the IC.
4
FLASH
Logic input to toggle operation 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
RSET pin to ground. Choose the external current sense
resistor (R
SENSE
) based on desired current in TORCH
mode. This pin does not have an internal pull-up/pull-
down; do not leave this pin floating.
5EN
Shutdown control input. Connect to VIN for normal
operation, connect to ground for shutdown. This pin
does not have an internal pull-up/pull-down; do not
leave this pin floating.
6RSET
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: VFB =
RSET*14uA/5 (Flash Mode)
7FB
Feedback input for the current control loop. Connect
directly to the current sense resistor.
8SGND
Internal ground pin. Control circuitry returns current to
this pin.
9PGND
Power ground pin.
Flying capacitor current returns
through this pin.
10
VOUT
Charge Pump Output Voltage.
Decouple with an
external capacitor.
At least 1µF is recommended.
Higher capacitor values reduce output ripple


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