LTC3407EDD-3 データシートの表示（PDF） - Linear Technology

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LTC3407EDD-3

Dual Synchronous, 1.8V/0.8A and 3.3V/0.8A 2.25MHz Step-Down DC/DC Regulator

Linear Technology 

LTC3407-3

PI FU CTIO S

VOUT1 (Pin 1): Output Voltage Feedback Pin for Channel 1.

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 VIN

enables regulator 1, while forcing it to GND causes regu-

lator 1 to shut down. Do not float this pin.

VIN (Pin 3): Main Power Supply. Must be closely decoupled

to GND.

SW1 (Pin 4): Regulator 1 Switch Node Connection to the

Inductor. This pin swings from VIN to GND.

GND (Pin 5): Main Ground. Connect to the (–) terminal of

COUT, and (–) terminal of CIN.

MODE/SYNC (Pin 6): Combination Mode Selection and

Oscillator Synchronization. This pin controls the operation

of the device. When tied to VIN or GND, Burst Mode

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.

SW2 (Pin 7): Regulator 2 Switch Node Connection to the

Inductor. This pin swings from VIN to GND.

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 VIN

enables regulator 2, while forcing it to GND causes regu-

lator 2 to shut down. Do not float this pin.

VOUT2 (Pin 10): Output Voltage Feedback Pin for Chan-

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 COUT, and (–) terminal of CIN. Must be

connected to electrical ground on PCB.

34073fa

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