Datasheet > LTC3446

LTC3446

更新时间： 2023-12-20 18:44:00

品牌	Logo	应用领域
亚德诺 - ADI		稳压器
页数	文件大小	规格书
20页	283K
描述
具双 VLDO 稳压器的单片式降压型稳压器

阅读下载

获取价格

数据手册

如果您发现信息不准确，欢迎纠错

LTC3446 数据手册

LTC3446

Monolithic Buck Regulator

with Dual VLDO Regulators

FeaTures

DescripTion

The LTC^®3446 combines a synchronous buck DC/DC con-

verter with two very low dropout (VLDO) linear regulators

to provide up to three stepped-down output voltages from

a single input voltage. The input voltage range is ideally

suited for Li-Ion battery-powered applications, as well

as powering low voltage logic from 5V or 3.3V rails. The

output voltage range extends down to 0.4V for the VLDO

regulators and 0.8V for the buck.

High Efﬁciency Triple Step-Down Outputs from a

Single Input Supply

1A Synchronous Buck Regulator Provides Main

Step-Down Output and Powers Two 300mA VLDO™

Linear Regulators

Output Voltages as Low as 400mV (VLDO Outputs)

Power Good Output

Input Voltage Range: 2.7V to 5.5V

Independent Enable Pin for Each Supply

The 1A synchronous buck converter provides the main

output with high efﬁciency, typically 85%. The two 300mA

VLDO regulators can run off the main output to provide

two additional lower voltage outputs. A built-in supply

monitor provides a power good indication.

Low (140µA Typ) No-Load Quiescent Current with

All Outputs Enabled

Constant Frequency Current Mode Operation

2.25MHz Switching Frequency Uses Small Inductors

Defeatable Automatic Burst Mode^®Operation for

The buck converter switches at 2.25MHz, allowing the use

ofsmallsurfacemountinductorsandcapacitors.Constant

frequency current mode operation produces controlled

output spectrum and fast transient response. A mode-

select pin allows automatic Burst Mode operation to be

enabled for higher efﬁciency at light load, or disabled for

lower noise operation down to very light loads. The two

VLDOregulatorsarestablewithceramicoutputcapacitors

as small as 1µF.

High Efﬁciency at Light Loads

1.5% Reference Accuracy

Overtemperature Protection

Thermally Enhanced 4mm × 3mm 14-Pin DFN

Package

applicaTions

Low Power Handheld Devices

Low Voltage and Multivoltage Power for Digital

L, LT, LTC, LTM and Burst Mode are registered trademarks and VLDO, Hot Swap, PowerPath

and Bat-Track are trademarks of Linear Technology Corporation. All other trademarks are the

property of their respective owners. Protected by U.S. Patents including 5481178, 6611131,

6304066, 6498466, 6580258.

Logic, I/O, FPGAs, CPLDs, ASICs and CPUs

Typical applicaTion

1.8µH

OUT

1.8V

Buck Efﬁciency vs Buck Load Current

2.9V TO 5.5V

22µF

X7R

22µF

X7R

400mA MAX

59k

100

PWM

MODE

BUCKFB

Burst Mode

OPERATION

47.5k

LTC3446

OUT

PGOOD LV

MODESEL

ENBUCK

ENLDO1

ENLDO2

1.5V

OUT1

2.2µF

X7R

300mA MAX

DIGITAL

110k

CONTROL

FB1

40.2k

3.3k

= 2.7V

= 3.6V

= 4.2V

OUT

OUT2

1.2V

2.2µF

X7R

300mA MAX

1000pF

80.6k

40.2k

100

1000

FB2

LOAD CURRENT (mA)

GND

3446 TA01

3446 TA01b

L1: TOKO A960AW-1R8M

3446ff

12 3 4 5 6 7...20

下载PDF

与LTC3446相关器件

型号	品牌	描述	获取价格	数据表
LTC3446EDE	Linear	Monolithic Buck Regulator with Dual VLDO Regulators	获取价格
LTC3446EDE#PBF	Linear	暂无描述	获取价格
LTC3446EDE#TR	Linear	LTC3446 - Monolithic Buck Regulator with Dual VLDO Regulators; Package: DFN; Pins: 14; Tem	获取价格
LTC3446EDE#TRPBF	Linear	LTC3446 - Monolithic Buck Regulator with Dual VLDO Regulators; Package: DFN; Pins: 14; Tem	获取价格
LTC3446EDE-PBF	Linear	Monolithic Buck Regulator with Dual VLDO Regulators	获取价格
LTC3446EDE-TRPBF	Linear	Monolithic Buck Regulator with Dual VLDO Regulators	获取价格

产品中心

服务支持

精选活动

关于我们

帮助中心

LTC3446

LTC3446 数据手册

与LTC3446相关器件

与LTC3446相关文章

您还可以找

产品中心

服务支持

精选活动

关于我们

帮助中心

LTC3446

LTC3446 数据手册

与LTC3446相关器件

与LTC3446相关文章

您还可以找

您在本页遇到什么问题？