Datasheet > LT3970

LT3970

更新时间： 2024-11-23 05:43:35

品牌	Logo	应用领域
凌特 - Linear		稳压器二极管
页数	文件大小	规格书
22页	247K
描述
40V, 350mA Step-Down Regulator with 2.5μA Quiescent Current and Integrated Diodes

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LT3970 数据手册

LT3970/LT3970-3.3/LT3970-5

40V, 350mA Step-Down

Regulator with 2.5µA

Quiescent Current and

Integrated Diodes

FEATURES

DESCRIPTION

Low Ripple Burst Mode^®Operation

The LT^®3970 is an adjustable frequency monolithic buck

switching regulator that accepts a wide input voltage

range up to 40V, and consumes only 2.5μA of quiescent

current. A high efﬁciency switch is included on the die

along with the catch diode, boost diode, and the neces-

saryoscillator, controlandlogiccircuitry. LowrippleBurst

Mode operation maintains high efﬁciency at low output

currents while keeping the output ripple below 5mV in a

typical application. Current mode topology is used for fast

transient response and good loop stability. A catch diode

current limit provides protection against shorted outputs

and overvoltage conditions. An enable pin with accurate

threshold is available, producing a low shutdown current

2.5μA I at 12V to 3.3V

OUT

Output Ripple < 5mV

P-P

Wide Input Voltage Range: 4.2V to 40V Operating

Adjustable Switching Frequency: 200kHz to 2.2MHz

Integrated Boost and Catch Diodes

350mA Output Current

Fixed Output Voltages: 3.3V, 5V

1.8μA I at 12V

Accurate 1V Enable Pin Threshold

Low Shutdown Current: I = 0.7μA

Internal Sense Limits Catch Diode Current

Power Good Flag

Output Voltage: 1.21V to 25V

of 0.7μA. A power good ﬂag signals when V

reaches

OUT

Internal Compensation

90% of the programmed output voltage. The LT3970 is

available in small 10-pin MSOP and 3mm × 2mm DFN

packages.

Small 10-Pin MSOP and (3mm × 2mm) DFN Packages

APPLICATIONS

L, LT, LTC, LTM, Burst Mode, Linear Technology and the Linear logo are registered trademarks

of Linear Technology Corporation. All other trademarks are the property of their respective

owners.

Automotive Battery Regulation

Power for Portable Products

Industrial Supplies

TYPICAL APPLICATION

5V Step-Down Converter

Efﬁciency

1000

100

= 12V

6V TO 40V

0.22μF

BOOST

LT3970

22μH

22pF

OUT

OFF ON

350mA

22μF

2.2μF

GND

316k

226k

f = 600kHz

0.1

0.01

3490 TA01a

0.01

0.1

100

LOAD CURRENT (mA)

3970 TA01b

3970fa

12 3 4 5 6 7...22

中文翻译

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与LT3970相关器件

型号	品牌	获取价格	描述	数据表
LT3970_12	Linear	获取价格	40V, 350mA Step-Down Regulator with 2.5μA
LT3970-3.3	Linear	获取价格	40V, 350mA Step-Down Regulator with 2.5μA Qui
LT3970-5	Linear	获取价格	40V, 350mA Step-Down Regulator with 2.5μA Qui
LT3970EDDB#PBF	Linear	获取价格	LT3970 Series - 40V, 350mA Step-Down Regulator with 2.5µA Quiescent Current and I
LT3970EDDB#TRMPBF	Linear	获取价格	LT3970 Series - 40V, 350mA Step-Down Regulator with 2.5µA Quiescent Current and I
LT3970EDDB#TRPBF	Linear	获取价格	LT3970 Series - 40V, 350mA Step-Down Regulator with 2.5µA Quiescent Current and I
LT3970EDDB-3.3#PBF	Linear	获取价格	LT3970 Series - 40V, 350mA Step-Down Regulator with 2.5µA Quiescent Current and I
LT3970EDDB-3.3#TRMPBF	Linear	获取价格	LT3970 Series - 40V, 350mA Step-Down Regulator with 2.5µA Quiescent Current and I
LT3970EDDB-3.3#TRPBF	Linear	获取价格	LT3970 Series - 40V, 350mA Step-Down Regulator with 2.5µA Quiescent Current and I
LT3970EDDB-3.3-PBF	Linear	获取价格	40V, 350mA Step-Down Regulator with 2.5μA Qui

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