lt3466efe-trpbf Linear Technology Corporation, lt3466efe-trpbf Datasheet - Page 6

• Manufacturer Part Number: lt3466efe-trpbf
• Description: White Led Driver And Boost Converter In 3mm X 3mm Dfn Package
• Manufacturer: Linear Technology Corporation

PI FU CTIO S
LT3466-1
V
to the cathode of the internal Schottky diode. Connect an
output capacitor from this pin to ground.
SW1 (Pin 2): Switch Pin for Converter 1. Connect the
inductor at this pin.
V
with a 1µF, X5R or X7R type ceramic capacitor.
SW2 (Pin 4): Switch Pin for Converter 2. Connect the
inductor at this pin.
V
to the cathode of the internal Schottky diode. Connect an
output capacitor from this pin to ground.
FB2 (Pin 6): Feedback Pin for Converter 2. The nominal
voltage at this pin is 800mV. Connect the resistor divider
to this pin. The feedback voltage can be programmed
as:
6
OUT1
IN
OUT2
V
V
U
(Pin 3): Input Supply Pin. Must be locally bypassed
FB2
FB2
(Pin 1): Output of Converter 1. This pin is connected
(Pin 5): Output of Converter 2. This pin is connected
≈ V
= 0.8V, when V
U
CTRL2
, when V
U
CTRL2
CTRL2
> 1V
< 0.8V
CTRL2 (Pin 7): Dimming and Shutdown Pin for Con-
verter 2. As the pin voltage is ramped from 0V to 1V, the
FB2 pin voltage tracks the CTRL2 voltage and ramps up to
0.8V. Any voltage above 1V does not affect the feedback
voltage. Do not leave the pin floating. It must be connected
to ground to disable converter 2.
R
Frequency. The switching frequency can be programmed
from 200KHz to 2MHz.
CTRL1 (Pin 9): Dimming and Shutdown Pin for Con-
verter 1. Connect this pin to ground to disable the con-
verter. As the pin voltage is ramped from 0V to 1.8V, the
LED current ramps from 0 to I
voltage above 1.8V does not affect the LED current.
FB1 (Pin 10): Feedback Pin for Converter 1. The nominal
voltage at this pin is 200mV. Connect cathode of the lowest
LED and the feedback resistor at this pin. The LED current
can be programmed by :
Exposed Pad (Pin 11): The Exposed Pad must be soldered
to the PCB system ground.
T
I
I
LED1
LED1
(Pin 8): Timing Resistor to Program the Switching
≈ (V
≈ (200mV/R
CTRL1
/5 • R
FB1
FB1
), when V
), when V
LED1
CTRL1
(= 200mV/R
CTRL1
> 1.8V
< 1V
FB1
). Any
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