LTC3530EMS Просмотр технического описания (PDF) - Linear Technology

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LTC3530EMS

Wide Input Voltage Synchronous Buck-Boost DC/DC Converter

Linear Technology 

LTC3530

PIN FUNCTIONS

GND (Pin 5): Ground for the IC.

VOUT (Pin 6): Output of the Synchronous Rectifier. A filter

capacitor is placed from VOUT to GND. A ceramic bypass

capacitor is recommended as close to the VOUT and GND

pins as possible.

VIN (Pin 7): Input Supply Voltage. Internal VCC for the IC.

A 10μF ceramic capacitor is recommended as close to the

VIN and GND pins as possible.

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

Applied voltage <0.4V shuts down the IC. Tie to >1.4V to

enable the IC and >1.6V to ensure the error amp is not

clamped from soft-start. An R-C from the shutdown com-

mand signal to this pin will provide a soft-start function

by limiting the rise time of VC.

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

The output voltage can be adjusted from 1.8V to 5.25V.

The feedback reference is typically 1.215V.

VOUT

=

1.215V

•



1+

R1

R2 

VC (Pin10): Error Amp Output. An R-C network is con-

nected from this pin to FB for loop compensation. Refer

to “Closing the Feedback Loop” section for component

selection guidelines. During Burst Mode operation, VC is

internally clamped.

Exposed Pad (Pin 11, DD Package Only): Ground. This

pin must be soldered to the PCB and electrically connected

to ground.

BLOCK DIAGRAM

SW1

3

VIN

7

CIN

SW A

SW B

L1

ANTI-RING

GATE

DRIVERS

AND

ANTICROSS

CONDUCTION

RSS

SHDN/SS

8

CSS

SHUTDOWN

SOFT-START

SHUTDOWN

SW2

4

SW D

SW C

REVERSE

AMP

+

Gm = 1/60k

2A –

ERROR

AMP

1.215V

PWM

LOGIC

PWM

COMPARATORS

VOUT

6

R1

FB

9

VC

CP1

10

COUT

R2

RT

1

OSC

RT

6

SLEEP

GND

5

AUTOMATIC

BURST MODE

CONTROL

VREF

1.215V

VREF

THERMAL

SHUTDOWN

BURST

2

RBURST

CBURST

3530 BD

3530fb

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