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LCGW

更新时间： 2024-09-18 11:38:15

品牌	Logo	应用领域
凌特 - Linear		稳压器开关
页数	文件大小	规格书
24页	806K
描述
1A, 2.2MHz Step-Down Switching Regulator in 2mm × 3mm DFN

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LCGW 数据手册

LT3505

1.2A, Step-Down

Switching Regulator in

3mm × 3mm DFN

FEATURES

DESCRIPTION

The LT^®3505 is a current mode PWM step-down DC/DC

converter with an internal 1.4A power switch. The wide

operating input range of 3.6V to 36V (40V maximum)

makes the LT3505 ideal for regulating power from a wide

variety of sources, including unregulated wall transform-

ers, 24V industrial supplies and automotive batteries. The

oscillatorcanbeprogrammedforhighfrequencyoperation

allowing the use of tiny, low cost external components or

it can be programmed for lower frequency operation to

maximize efﬁciency.

Wide Input Range: 3.6V to 36V Operating,

40V Maximum

Up to 1.2A Output Current

Resistor-Programmable Fixed-Frequency Operation

from 200kHz to 3MHz

Output Adjustable Down to 780mV

Short-Circuit Robust

Uses Tiny Capacitors and Inductors

Soft-Start

Low Shutdown Current: <2µA

Low V_CESATSwitch: 350mV at 1A

Cycle-by-cycle current limit provides protection against

shorted outputs and soft-start eliminates input current

surge during start-up. The low current (<2µA) shutdown

mode provides output disconnect, enabling easy power

management in battery-powered systems.

Thermally Enhanced, Low Proﬁle 3mm x 3mm

DFN-8 and MSOP-8 Packages

APPLICATIONS

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

All other trademarks are the property of their respective owners.

Automotive Battery Regulation

Industrial Control Supplies

Wall Transformer Regulation

Distributed Supply Regulation

Battery-Powered Equipment

TYPICAL APPLICATION

750kHz, 3.3V Step-Down Converter

Efﬁciency

OUT

3.3V

BOOST

4.2V TO 36V

1.1A, V > 5V

1.2A, V > 8V

0.1µF

10µH

36.5k

ON OFF

SHDN

LT3505

GND

22pF

10µF

11.3k

= 12V

= 3.3V

= 750kHz

75.0k

69.8k

68pF

OUT

1µF

L = 10 H

0.8

LOAD CURRENT (A)

1.0

0.2

0.4

0.6

1.2

3505 TA01

3505fc

12 3 4 5 6 7...24

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