lt3465a Linear Technology Corporation, lt3465a Datasheet - Page 5

• Manufacturer Part Number: lt3465a
• Description: 2.4mhz White Led Step-up Converters With Built-in Schottky In Thinsot
• Manufacturer: Linear Technology Corporation

PI FU CTIO S
V
LEDs. Minimize trace between this pin and output capaci-
tor to reduce EMI.
GND (Pin 2): Ground Pin. Connect directly to local ground
plane.
FB (Pin 3): Feedback Pin. Reference voltage is 200mV.
Connect LEDs and a resistor at this pin. LED current is
determined by the resistance and CTRL pin voltage:
OUT
U
(Pin 1): Output Pin. Connect to output capacitor and
U
I
LED
=
U
R
1
FB
•
⎛
⎜
⎜
⎜ ⎜
⎜
⎝
200
mV
–
26
mV
•
1
n
⎛
⎜
⎜
⎜
⎜
⎝
exp p
exp
⎛
⎝ ⎜
5
V
⎛
⎝ ⎜
mV
CTRL (Pin 4): Dimming Control and Shutdown Pin. Ground
this pin to shut down the device. When V
than about 1.8V, full-scale LED current is generated.
When V
Floating this pin places the device in shutdown mode.
V
with a 1µF X5R or X7R type ceramic capacitor.
SW (Pin 6): Switch Pin. Connect inductor here.
CTRL
200
IN
26
•
(Pin 5): Input Supply Pin. Must be locally bypassed
mV
mV
26
( )
mV
mV
CTRL
⎞
⎠ ⎟
⎞
⎠ ⎟
is less than 1V, LED current is reduced.
+
1
⎞
⎟
⎟
⎟
⎟
⎠
⎞
⎟
⎟
⎟
⎟
⎠
for V
LT3465/LT3465A
CTRL
>
150
mV
CTRL
is greater
3465afa
5