LTC3541-2(RevA) 查看數據表（PDF） - Linear Technology

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LTC3541-2
(Rev.:RevA)

High Efficiency Buck + VLDO Regulator

Linear Technology 

LTC3541-2

PI FU CTIO S

VIN (Pin 1): Main Supply Pin. This pin must be closely

decoupled to GND with a 10µF or greater capacitor.

ENBUCK (Pin 2): Buck Enable Pin. This pin enables the

buck regulator when driven to a logic high.

VOUT (Pin 3): Buck Regulator Output Pin. This pin receives

the buck regulator’s output voltage.

NC (Pin 4): Not Connected. This pin must not be connected

or capacitively loaded.

LVOUT (Pin 5): VLDO/Linear Regulator Output Pin. This

pin provides the regulated output voltage from the VLDO

or linear regulator.

LVIN (Pin 6): VLDO/Linear Regulator Input Supply Pin.

This pin provides the input supply voltage for the VLDO

power FET.

GND (Pin 7): Analog Ground Pin.

MODE (Pin 8): Buck Mode Selection Pin. This pin enables

buck Pulse-Skip operation when driven to a logic high

and enables buck Burst Mode operation when driven to

a logic low.

ENVLDO (Pin 9): VLDO/Linear Regulator Enable Pin.

When driven to a logic high, this pin enables the linear

regulator when the ENBUCK pin is driven to a logic low,

and enables the VLDO regulator when the ENBUCK pin is

driven to a logic high.

SW (Pin 10): Switch Node Pin. This pin connects the

internal main and synchronous power MOSFET switches

to the external inductor for the buck regulator.

Exposed Pad (Pin 11): Ground Pin. This pin must be

soldered to the PCB to provide both electrical contact to

ground and good thermal contact to the PCB.

Note: Table 1 details the truth table for the control pins

of the LTC3541-2.

Table 1. LTC3541-2 Control Pin Truth Table

PIN NAME

OPERATIONAL DESCRIPTION

ENBUCK ENVLDO MODE

0

0

X LTC3541-2 Powered Down

0

1

X Buck Powered Down, VLDO Powered

Down, Linear Regulator Enabled

1

0

0 Buck Enabled, VLDO Powered Down,

Linear Regulator Powered Down,

Burst Mode Operation

1

0

1 Buck Enabled, VLDO Powered Down,

Linear Regulator Powered Down,

Pulse-Skip Mode Operation

1

1

0 Buck Enabled, VLDO Enabled, Linear

Regulator Powered Down, Burst Mode

Operation

1

1

1 Buck Enabled, VLDO Enabled, Linear

Regulator Powered Down, Pulse-Skip

Mode Operation

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