Datasheet > LTC3405A-1.5

LTC3405A-1.5

更新时间： 2023-12-20 18:45:39

品牌	Logo	应用领域
亚德诺 - ADI		稳压器
页数	文件大小	规格书
16页	204K
描述
采用 ThinSOT 封装的 1.5V、1.5MHz、300mA 同步降压型稳压器

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LTC3405A-1.5 数据手册

LTC3405A-1.5/LTC3405A-1.8

1.5V, 1.8V, 1.5MHz, 300mA

Synchronous Step-Down

Regulators in ThinSOT

FEATURES

DESCRIPTIO

The LTC^®3405A-1.5/LTC3405A-1.8 are high efficiency

monolithic synchronous buck regulators using a constant

frequency, current mode architecture. Supply current

during operation is only 20µA and drops to <1µA in

shutdown. The2.5Vto5.5Vinputvoltagerangemakesthe

LTC3405A-1.5/LTC3405A-1.8 ideally suited for single

Li-Ion battery-powered applications. 100% duty cycle

provides low dropout operation, extending battery life in

portable systems.

■

High Efficiency: Up to 93%

■

Very Low Quiescent Current: Only 20µA

During Operation

■

300mA Output Current at V_IN= 3V

■

2.5V to 5.5V Input Voltage Range

■

1.5MHz Constant Frequency Operation

No Schottky Diode Required

■

Low Dropout Operation: 100% Duty Cycle

Stable with Ceramic Capacitors

Shutdown Mode Draws <1µA Supply Current

±3% Output Voltage Accuracy

Current Mode Operation for Excellent Line and

Load Transient Response

Switching frequency is internally set at 1.5MHz, allowing

the use of small surface mount inductors and capacitors.

TheLTC3405A-1.5/LTC3405A-1.8arespecificallydesigned

to work well with ceramic output capacitors, achieving

very low output voltage ripple and a small PCB footprint.

■

Overtemperature Protected

Low Profile (1mm) ThinSOT^TMPackage

The internal synchronous switch increases efficiency and

eliminates the need for an external Schottky diode. The

LTC3405A-1.5/LTC3405A-1.8areavailableinalowprofile

(1mm) ThinSOT package.

APPLICATIO S

■

Cellular Telephones

■

Personal Information Appliances

■

Wireless and DSL Modems

For adjustable output voltage, refer to the LTC3405A data

sheet.

■

Digital Still Cameras

■

MP3 Players

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

ThinSOT is a trademark of Linear Technology Corporation.

■

Portable Instruments

Protected by U.S. Patents, including 6580258, 5481178.

TYPICAL APPLICATIO

100

= 2.7V

4.7µH*

OUT

= 3.6V

1.8V

2.7V

300mA

TO 5.5V

= 4.2V

LTC3405A-1.8

RUN

4.7µF

OUT

4.7µF

CER

= 5.5V

CER

MODE

OUT

GND

3405A1518 F01

*MURATA LQH3C4R7M34

**TAIYO YUDEN JMK212BJ475MG

0.1

1000

100

OUTPUT CURRENT (mA)

3405A1518 F01b

Figure 1a. High Efficiency Step-Down Converter

Figure 1b. Efficiency vs Load Current

3405a1518fa

12 3 4 5 6 7...16

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