LT8584
9
8584fb
For more information www.linear.com/LT8584
GND (Pin1, Pin 2, Pin 3, Pin 4, Pin 17): Must be soldered
directly to local ground plane.
MODE (Pin 5): Serial Enable Pin. Connect this pin to
ground to enable serial interface for analog mux control.
Connect this pin to V
IN
to disable the analog mux. When
the analog mux is disabled, the OUT pin defaults to V
TEMP
measurement. Do not float this pin.
RTMR (Pin 6): Serial Interface Timer Pin. Place a resistor
from this pin to ground to set the serial count duration
window, t
W
. See the Applications Information section for
proper resistor selection.
D
IN
(Pin 7): Data Input Pin. Take this pin to ground to
initiate switching if MODE pin is connected to V
IN
, or to
select the desired analog mux state if MODE pin is tied
to ground. This pin is designed to be directly driven from
the LTC680x family’s S pins.
OUT (Pin 8): Analog Output Pin. Connect this pin to an
accurate voltage monitor to measure a voltage propor
-
tional to the internal IC temperature, V
TEMP
, if MODE pin
is connected to V
IN
, or measure the output of the internal
analog mux if MODE pin is connected to ground. In analog
mux mode,
the OUT pin allows voltage monitoring of the
V
CELL
pin, the V
SNS
pin, or V
TEMP
. This pin is designed
to be directly connected to the LTC680x family’s C pins.
Must connect a compensation capacitor to this pin. See
the Applications Information section for proper capacitor
sizing and placement.
V
IN
(Pin 9): Supply Pin. Connect this pin directly to the
positive battery cell terminal. Must be bypassed with high
grade (X5R or better) ceramic capacitor placed close to
the transformer’s primary winding connection.
V
CELL
(Pin 10): Cell Voltage Monitor Pin. This pin provides
a Kelvin connection to the battery cell for accurate voltage
monitoring. Connect this pin directly to the positive battery
cell terminal. The recommended cell voltage is 2.5V to 5.3V.
V
SNS
(Pin 11): Voltage Sense Pin. Connect this pin to the
current sense resistor connected to the primary side of
the transformer. Use this pin to measure average current
discharged from battery cell (see the Block Diagram). MODE
pin must be connected to ground and the internal analog
mux must have the V
SNS
pin selected to use this feature.
Input current is determined as (V
VCELL
– V
VSNS
)/R
SNS
.
DCHRG (Pin 12): Discharge Pin. The Discharge
pin can
be configured as an input or output pin. Connect MODE
pin to ground to configure DCHRG as an output pin where
DCHRG is driven to V
IN
during switching and driven
to ground when switching is deactivated. The output
configuration can be used to drive multiple LT8584’s or
other switching regulators in parallel, to boost discharge
capability. Connect MODE pin high to configure DCHRG as
an input. When configured as an input pin, drive DCHRG
pin to V
IN
to enable switching. Note in this mode that se-
rial communication
is disabled and the D
IN
pin must be
grounded to initiate switching.
SW (Pin 13, Pin 14, Pin 15, Pin 16): Switch Pin. This
is the collector of the internal 6A NPN power switch.
Minimize the metal trace area connected to this pin to
minimize EMI. Connect the bottom side of the transformer
primary to this pin.
pin FuncTions
