Datasheet > LTC1772IS6#TR

LTC1772IS6#TR

更新时间： 2024-11-19 20:10:15

品牌	Logo	应用领域
凌特 - Linear		开关光电二极管
页数	文件大小	规格书
12页	167K
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LTC1772IS6#TR 数据手册

LTC1772

Constant Frequency

Current Mode Step-Down

DC/DC Controller in SOT-23

DESCRIPTIO

FEATURES

■

High Efficiency: Up to 94%

The LTC^®1772 is a constant frequency current mode step-

downDC/DCcontrollerprovidingexcellentACandDCload

and line regulation. The device incorporates an accurate

undervoltagelockoutfeaturethatshutsdowntheLTC1772

when the input voltage falls below 2.0V.

■

High Output Currents Easily Achieved

■

Wide V_INRange: 2.5V to 9.8V

■

Constant Frequency 550kHz Operation

Burst Mode^®Operation at Light Load

■

Low Dropout: 100% Duty Cycle

Tiny 6-Lead SOT-23 Package

0.8V Reference Allows Low Output Voltages

The LTC1772 provides a ±2.5% output voltage accuracy

and consumes only 270µA of quiescent current. For

applications where efficiency is a prime consideration, the

LTC1772 is configured for Burst Mode operation, which

enhances efficiency at low output current.

■

Current Mode Operation for Excellent Line and Load

Transient Response

■

Low Quiescent Current: 270µA

■

To further maximize the life of a battery source, the

external P-channel MOSFET is turned on continuously in

dropout (100%dutycycle).In shutdown, the device draws

a mere 8µA. High constant operating frequency of 550kHz

allows the use of a small external inductor.

Shutdown Mode Draws Only 8µA Supply Current

±2.5% Reference Accuracy

APPLICATIO S

■

One or Two Lithium-Ion-Powered Applications

The LTC1772 is available in a small footprint 6-lead

SOT-23.

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

Burst Mode is a registered trademark of Linear Technology Corporation.

All other trademarks are the property of their respective owners.

■

Cellular Telephones

■

Wireless Modems

■

Portable Computers

■

Distributed 3.3V, 2.5V or 1.8V Power Systems

■

Scanners

TYPICAL APPLICATIO

Efficiency vs Load Current

2.5V

100

TO 9.8V

0.03Ω

= 4.2V

10µF

= 3.3V

10V

4.7µH

/RUN PGATE

LTC1772

2.5V

OUT

10k

220pF

V = 6V

C2A

47µF

C2B

1µF

10V

GND

–

= 8.4V

174k

= 9.8V

SENSE

C1: TAIYO YUDEN LMK325BJ106K-T

C2A: SANYO 6TPA47M

C2B: AVX 0805ZC105KAT1A

D1: MOTOROLA MBRM120T3

L1: MURATA LQN6C-4R7

80.6k

= 2.5V

OUT

100

1000

10000

1772 F01a

M1: FAIRCHILD FDC638P

R1: IRC LRC-LR1206-01-R030F

LOAD CURRENT (mA)

1772 F01b

1772fb

Figure 1. High Efficiency, High Output Current 2.5V/2A Regulator

12 3 4 5 6 7...12

中文翻译

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与LTC1772IS6#TR相关器件

型号	品牌	获取价格	描述	数据表
LTC1772IS6#TRM	Linear	获取价格	LTC1772 - Constant Frequency Current Mode Step-Down DC/DC Controller in SOT-23; Package: S
LTC1772IS6#TRMPBF	Linear	获取价格	暂无描述
LTC1772IS6#TRPBF	Linear	获取价格	LTC1772 - Constant Frequency Current Mode Step-Down DC/DC Controller in SOT-23; Package: S
LTC1773	Linear	获取价格	No RSENSE Low EMI, Synchronous DC/DC Controller with Output Tracking
LTC1773	ADI	获取价格	同步降压型 DC/DC 控制器
LTC1773EMS	Linear	获取价格	Synchronous Step-Down DC/DC Controller
LTC1773EMS#PBF	Linear	获取价格	LTC1773 - Synchronous Step-Down DC/DC Controller; Package: MSOP; Pins: 10; Temperature Ran
LTC1773EMS#TR	Linear	获取价格	LTC1773 - Synchronous Step-Down DC/DC Controller; Package: MSOP; Pins: 10; Temperature Ran
LTC1773EMS#TRPBF	Linear	获取价格	LTC1773 - Synchronous Step-Down DC/DC Controller; Package: MSOP; Pins: 10; Temperature Ran
LTC1773EMS-PBF	Linear	获取价格	Synchronous Step-Down DC/DC Controller

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