Datasheet > 3570

3570

更新时间： 2022-12-26 14:43:06

品牌	Logo	应用领域
凌特 - Linear		转换器控制器
页数	文件大小	规格书
20页	283K
描述
1.5A Buck Converter, 1.5A Boost Converter and LDO Controller

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3570 数据手册

LT3570

1.5A Buck Converter,

1.5A Boost Converter and

LDO Controller

FEATURES

DESCRIPTION

2.5V to 36V Input Voltage Range

The LT^®3570 is a buck and boost converter with internal

power switches and LDO controller. Each converter is

designed with a 1.5A current limit and an input range

from 2.5V to 36V, making the LT3570 ideal for a wide

variety of applications. Switching frequencies up to 2MHz

are programmed with an external timing resistor and the

oscillator can be synchronized to an external clock up to

2.75MHz.

Programmable Switching Frequency

from 500kHz to 2MHz

Synchronizable Up to 2.75MHz

: 0.8V

OUT(MIN)

Independent Soft-Start for Each Converter

Separate V Supplies for Each Converter

Duty Cycle Range: 0% to 90% at 1MHz

Available in 24-Lead (4mm × 4mm) QFN and

20-Lead TSSOP Packages

The LT3570 features a programmable soft-start function

that limits the feedback voltage during start-up helping

prevent overshoot and limiting inrush current. The LDO

controller is capable of delivering up to 10mA of base

current to an external NPN transistor.

APPLICATIONS

Cable and Satellite Set-Top Boxes

L, LT, LTC and LTM are registered trademarks of Linear Technology Corporation.

All other trademarks are the property of their respective owners.

Automotive Systems

Telecom Systems

“Dying Gasp” Systems

TFT LCD Displays

TYPICAL APPLICATION

10μF

BIAS

IN1 IN2 IN3

Efﬁciency

SHDN1

SHDN2

SHDN3

SHDN1

SHDN2

SHDN3

BOOST

100

100nF

3.3V

OUT2

SW2

3.3μH

32.4k

6.8μH

OUT1

12V

275mA

SW1

FB2

SS2

22μF

143k

LT3570

= 1.2MHz

= 5V

10μF

10.2k

FB1

SS1

22k

1nF

10nF

= 12V

10.0k

OUT1

OUT2

OUT3

OUT1

OUT3

= 3.3V

= 2.5V

22k

1nF

= 275mA

= 100mA

NPN_DRV

OUT3

2.5V

0.2

0.4

OUT2

0.6

(A)

0.8

1.0

10nF

100mA

22.1k

3570 TA01b

FB3

2.2μF

SYNC

15.8k

GND

10.2k

3570 TA01a

3570fa

12 3 4 5 6 7...20

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