LT8705
(QFN/TSSOP)
PIN FUNCTIONS
CSPOUT (Pin 31/Pin 34): The (+) Input to the Output
SWEN (Pin 36 QFN Only): Switch Enable Pin. Tie high
Current Monitor Amplifier. This pin and the CSNOUT pin
to enable switching. Ground to disable switching. Don’t
measure the voltage across the sense resistor, R
,
float this pin. This pin is internally tied to INTV in the
SENSE2
CC
to provide the output current signals. Connect this pin
TSSOP package.
to V
when not in use. See Applications Information
OUT
IMON_IN (Pin 38/Pin 3): Input Current Monitor Pin. The
current out of this pin is proportional to the input current.
See the Operation and Applications Information sections.
section for proper use of this pin.
CSNIN (Pin 32/Pin 36): The (–) Input to the Input Current
Monitor Amplifier. This pin and the CSPIN pin measure
MODE (Pin 37/Pin 2): Mode Pin. The voltage applied to
this pin sets the operating mode of the controller. When
the applied voltage is less than 0.4V, the forced continu-
ous current mode is active. When this pin is allowed to
float, Burst Mode operation is active. When the MODE pin
voltage is higher than 2.3V, discontinuous mode is active.
the voltage across the sense resistor, R
, to provide
IN
SENSE1
the input current signals. Connect this pin to V when not
in use. See Applications Information section for proper
use of this pin.
CSPIN (Pin 33/Pin 37): The (+) Input to the Input Cur-
rent Monitor Amplifier. Connect this pin to V when not
IN
GND (Pin 13, Exposed Pad Pin 39/Pin 16, Exposed Pad
Pin 39): Ground. Tie directly to local ground plane.
in use. See Applications Information section for proper
use of this pin.
V
(Pin 34/Pin 38): Main Input Supply Pin. It must be
IN
locally bypassed to ground.
INTV (Pin 35/Pin 1): Internal 6.35V Regulator Output.
CC
MustbeconnectedtotheGATEV pin.INTV ispowered
CC
CC
from EXTV when the EXTV voltage is higher than
CC
CC
6.4V, otherwise INTV is powered from V . Bypass this
CC
IN
pin to ground with a minimum 4.7μF ceramic capacitor.
8705p
12
For more information www.linear.com/8705
Linear [ Linear ]
