LTC3407-3 Linear Technology, LTC3407-3 Datasheet - Page 5

• Manufacturer Part Number: LTC3407-3
• Description: Dual Synchronous 1.8V/0.8A and 3.3V/0.8A 2.25MHz Step-Down DC/DC Regulator
• Manufacturer: Linear Technology

PI FU CTIO S
V
An internal resistive divider divides the output voltage
down for comparison to the internal reference voltage.
RUN1 (Pin 2): Regulator 1 Enable. Forcing this pin to V
enables regulator 1, while forcing it to GND causes regu-
lator 1 to shut down. Do not float this pin.
V
to GND.
SW1 (Pin 4): Regulator 1 Switch Node Connection to the
Inductor. This pin swings from V
GND (Pin 5): Main Ground. Connect to the (–) terminal of
C
MODE/SYNC (Pin 6): Combination Mode Selection and
Oscillator Synchronization. This pin controls the operation
of the device. When tied to V
operation or pulse skipping mode is selected, respec-
tively. The oscillation frequency can be syncronized to an
external oscillator applied to this pin and pulse skipping
mode is automatically selected. Do not float this pin.
OUT1
IN
OUT
U
(Pin 3): Main Power Supply. Must be closely decoupled
, and (–) terminal of C
(Pin 1): Output Voltage Feedback Pin for Channel 1.
U
U
IN
.
IN
IN
or GND, Burst Mode
to GND.
IN
SW2 (Pin 7): Regulator 2 Switch Node Connection to the
Inductor. This pin swings from V
POR (Pin 8): Power-On Reset . This common-drain logic
output is pulled to GND when the output voltage falls
below –8.5% of regulation and goes high after 262,144
clock cycles when both channels are within regulation.
RUN2 (Pin 9): Regulator 2 Enable. Forcing this pin to V
enables regulator 2, while forcing it to GND causes regu-
lator 2 to shut down. Do not float this pin.
V
nel 2. An internal resistive divider divides the output
voltage down for comparison to the internal reference
voltage.
Exposed Pad (GND) (Pin 11): Power Ground. Connect to
the (–) terminal of C
connected to electrical ground on PCB.
OUT2
(Pin 10): Output Voltage Feedback Pin for Chan-
OUT
, and (–) terminal of C
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IN
LTC3407-3
to GND.
IN
. Must be
34073fa
5
IN