LTC3548AEDD-TRPBF(RevA) Просмотр технического описания (PDF) - Linear Technology

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производитель

LTC3548AEDD-TRPBF
(Rev.:RevA)

Dual Synchronous 400mA/800mA, 2.25MHz Step-Down DC/DC Regulator

Linear Technology 

LTC3548A

PIN FUNCTIONS

VFB1 (Pin 1): Output Feedback. Receives the feedback volt-

age from the external resistive divider across the output.

Nominal voltage for this pin is 0.6V.

RUN/SS1 (Pin 2): Regulator 1 Enable and Soft-Start Input.

Forcing this pin to VIN enables regulator 1, while forcing it

to GND causes regulator 1 to shut down. Connect external

RC network with desired time-constant to enable soft-start

feature. This pin must be driven; do not float.

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.

NC (Pin 5): No Connect. This pin is not connected inter-

nally. Connect to ground on PCB for shielding purposes.

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

Oscillator Synchronization. This pin controls the opera-

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

operation or pulse-skipping mode is selected, respectively.

Do not float this pin. The oscillation frequency can be

synchronized to an external oscillator applied to this pin

and pulse-skipping mode is automatically selected.

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 is not

within ±8.5% of regulation and goes high after 216 clock

cycles when both channels are within regulation.

RUN/SS2 (Pin 9): Regulator 2 Enable and Soft-Start Input.

Forcing this pin to VIN enables regulator 2, while forcing it

to GND causes regulator 2 to shut down. Connect external

RC network with desired time-constant to enable soft-start

feature. This pin must be driven; do not float.

VFB2 (Pin 10): Output Feedback. Receives the feedback

voltage from the external resistive divider across the output.

Nominal voltage for this pin is 0.6V.

Exposed Pad (GND) (Pin 11): Power Ground. Connect to

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

soldered to electrical ground on PCB.

3548afa

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