LTC3541 データシートの表示（PDF） - Linear Technology

部品番号

コンポーネント説明

メーカー

LTC3541

High Efficiency Buck + VLDO Regulator

Linear Technology 

LTC3541

PIN FUNCTIONS

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.

BUCKFB (Pin 3): Buck Regulator Feedback Pin. This pin

receives the buck regulator’s feedback voltage from an

external resistive divider.

LFB (Pin 4): VLDO/Linear Regulator Feedback Pin. This

pin receives either the VLDO or linear regulator’s feedback

voltage from an external resistive divider.

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 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.

Table 1. LTC3541 Control Pin Truth Table

PIN NAME

ENBUCK ENVLDO MODE OPERATIONAL DESCRIPTION

0

0

X LTC3541 Powered Down

0

1

X Buck Powered Down, VLDO Regulator

Powered Down, Linear Regulator

Enabled

1

0

0 Buck Enabled, VLDO Regulator Powered

Down, Linear Regulator Powered Down,

Burst Mode Operation

1

0

1 Buck Enabled, VLDO Regulator Powered

Down, Linear Regulator Powered Down,

Pulse-Skip Mode Operation

1

1

0 Buck Enabled, VLDO Regulator Enabled,

Linear Regulator Powered Down, Burst

Mode Operation

1

1

1 Buck Enabled, VLDO Regulator Enabled,

Linear Regulator Powered Down, Pulse-

Skip Mode Operation

3541fb

8

For more information www.linear.com/LTC3541

Share Link: