LTC3532 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

LTC3532

Micropower Synchronous Buck-Boost DC/DC Converter

Linear Technology 

LTC3532

PI FU CTIO S

SHDN/SS (Pin 8): Combined Soft-Start and Shutdown.

Grounding this pin shuts down the IC. Tie to >1.5V to

enable the IC and >2.4V to ensure the error amp is not

clamped from soft-start. For Burst Mode operation, this pin

must be pulled up to within 0.5V of VIN. An RC from the

shutdown command signal to this pin will provide a soft-

start function by limiting the rise time of the VC pin.

FB (Pin 9): Feedback Pin. Connect resistor divider tap

here. The output voltage can be adjusted from 2.4V to

5.25V. The feedback reference is typically 1.22V. Set VOUT

according to the formula:

VOUT

=

1.22V

• (R1+

R2

R2)

VC (Pin10): Error Amp Output: A frequency compensa-

tion network is connected from this pin to the FB pin to

compensate the loop. Refer to the Applications Information

section for component value selection.

Exposed Pad (Pin11): The exposed pad (DFN Package)

must be soldered to PCB ground for electrical contact and

rated thermal performance.

BLOCK DIAGRA

VIN

7

SW A

3

SW1

SW B

GATE

DRIVERS

AND

ANTICROSS

CONDUCTION

4

SW2

SW D

SW C

REVERSE

AMP

VOUT

6

6

RT

1

PEAK CURRENT

+

LIMIT

1.1A

–

VIN

+

2.3V

–

UVLO

PWM

LOGIC

PWM COMP

SLEEP

OSC

VIN

SHDN/SS

8

SHUTDOWN

SOFT-START

VCC

SHUTDOWN

GND

5

+

gm = 1/60k

1A –

ERROR

AMP

1.22V

FB

9

VC

10

AUTOMATIC

Burst Mode

CONTROL AND

VC HOLD

VREF

SS

1.22V

VREF

THERMAL

SHUTDOWN

BURST

2

3532 BD

3532fc

Share Link: