Datasheet > LT3668_15

LT3668_15

更新时间： 2024-02-25 23:10:35

品牌	Logo	应用领域
凌特 - Linear		/
页数	文件大小	规格书
28页	382K
描述
40V 400mA Step-Down Switching Regulator with Dual Fault Protected Tracking LDOs

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LT3668_15 数据手册

LT3668

40V 400mA Step-Down

Switching Regulator with Dual

Fault Protected Tracking LDOs

FEATURES

DESCRIPTION

TheLT^®3668isamonolithictriplepowersupplycomposed

Dual Low Dropout Linear Tracking Regulators

200mA Outputs with Programmable Current Limits

1.6V to 45V Input Range

Fault Protected to 45V

of a 400mA buck switching regulator and two 200mA low

dropout linear tracking regulators (LDOs).This provides a

complete and robust power solution for applications that

require the power supply of a sensor to tightly track the

power supply of a measurement ASIC.

Triple Output Supply from a Single Input Requires

Only One Inductor

I = 50μA at 12V to 6V and 5V with No Load

Each tracking LDO supplies 200mA of output current with

a typical dropout voltage of 340mV, and each LDO has an

accurate resistor programmable current limit.

Buck Regulator:

Low Ripple (<15mV ) Burst Mode^®Operation

P-P

400mA Output with Internal Power Switch

Internal protection circuitry includes reverse-battery

protection, current limiting, thermal limiting and reverse

current protection.

4.3V to 40V Input Operation Range (60V Max)

Adjustable 250kHz to 2.2MHz Switching Frequency

Power Good Indicator

Available in a Thermally-Enhanced 16-Lead

MSOP Package

The buck regulator includes a high efficiency switch, a

boost diode, and the necessary oscillator, control and

logic circuitry. Current mode topology is used for fast

transient response and good loop stability. Low ripple

Burst Mode operation maintains high efficiency at low

output currents while keeping output ripple below 15mV

in a typical application.

APPLICATIONS

Fault-Protected Sensor Supply

Automotive and Industrial Supplies

Power for Portable Instrumentation

The LT3668 is available in a thermally-enhanced 16-lead

MSOPpackagewithexposedpadforlowthermalresistance.

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.

TYPICAL APPLICATION

No-Load Supply Current

7V TO 40V

TRANSIENT

TO 60V

100

4.7µF

0.22µF

IN1

BOOST

27µH

100mA

22µF

232k

931k

ON OFF

IN3/BD

IN2

LT3668

22pF

FB1

f = 600kHz 174k

294k

ADJ2

ADJ3

OUT3

150mA

(FOLLOWS

OUT3)

150mA

OUT2

10µF

EN2/ILIM2 GND EN3/ILIM3

3668 TA01a

INPUT VOLTAGE (V)

3668 TA01b

3668fa

For more information www.linear.com/LT3668

12 3 4 5 6 7...28

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与LT3668_15相关器件

型号	品牌	获取价格	描述	数据表
LT3669	ADI	获取价格	具集成型降压转换器和 LDO 的 IO-Link 收发器
LT3669_15	Linear	获取价格	IO-Link Transceiver with Integrated Step-Down Regulator and LDO
LT3669-2_15	Linear	获取价格	IO-Link Transceiver with Integrated Step-Down Regulator and LDO
LT3680	Linear	获取价格	36V, 3.5A, 2.4MHz Step-Down Switching Regulat
LT3680	ADI	获取价格	具 75μA 静态电流的 36V、3.5A、2.4MHz 降压型开关稳压器
LT3680EDD#TRPBF	ADI	获取价格	LT3680 - 36V, 3.5A, 2.4MHz Step-Down Switching Regulator with 75µA Quiescent Curr
LT3680EDD-PBF	Linear	获取价格	36V, 3.5A, 2.4MHz Step-Down Switching Regulat
LT3680EDD-TRPBF	Linear	获取价格	36V, 3.5A, 2.4MHz Step-Down Switching Regulat
LT3680EMSE#PBF	Linear	获取价格	LT3680 - 36V, 3.5A, 2.4MHz Step-Down Switching Regulator with 75µA Quiescent Curr
LT3680EMSE#TRPBF	Linear	获取价格	LT3680 - 36V, 3.5A, 2.4MHz Step-Down Switching Regulator with 75µA Quiescent Curr

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