Datasheet > LTC3554

LTC3554

更新时间： 2023-12-20 18:44:01

品牌	Logo	应用领域
亚德诺 - ADI		电池稳压器
页数	文件大小	规格书
36页	519K
描述
具锂离子电池充电器和两个降压型稳压器的微功率 USB 电源管理器

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LTC3554 数据手册

LTC3554/LTC3554-1/

LTC3554-2/LTC3554-3

Micropower USB Power

Manager with Li-Ion Charger

and Two Step-Down Regulators

DescripTion

FeaTures

The LTC^®3554 family* are micropower, highly integrated

powermanagementandbatterychargerICsforsingle-cell

Li-Ion/Polymer battery applications. They include a

PowerPath™ manager with automatic load prioritization,

a battery charger, an ideal diode and numerous internal

protectionfeatures.DesignedspecificallyforUSBapplica-

tions, the LTC3554 power managers automatically limit

input current to a maximum of either 100mA or 500mA.

Battery charge current is automatically reduced such that

the sum of the load current and the charge current does

not exceed the selected input current limit.

10μA Standby Mode Quiescent Current (All Outputs On)

Seamless Transition Between Input Power Sources:

Li-Ion/Polymer Battery and USB

240mΩ Internal Ideal Diode

Dual High Efficiency Step-Down Switching Regulators

(200mA I ) with Adjustable Output Voltages

OUT

Pushbutton On/Off Control with System Reset

Reset Time: 5 sec (LTC3554/LTC3554-1),

14 sec (LTC3554-2/LTC3554-3)

Full Featured Li-Ion/Polymer Battery Charger

Programmable Charge Current with Thermal Limiting

Instant-On Operation with Discharged Battery

Battery Float Voltage: 4.2V (LTC3554/LTC3554-2/

LTC3554-3), 4.1V (LTC3554-1)

The LTC3554 also includes two synchronous step-down

switching regulators as well as a pushbutton controller.

With all supplies enabled in standby mode, the quiescent

current drawn from the battery is only 10μA. The LTC3554

family are available in a 3mm × 3mm × 0.75mm 20-lead

QFN package.

3mm × 3mm × 0.75mm 20-Lead QFN Package

applicaTions

USB-Based Handheld Products

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

and PowerPath, Hot Swap 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 6522118, 6700364, 5481178, 6304066, 6570372, 6580258, 7511390.

Portable Li-Ion/Polymer Based Electronic Devices

Fitness Computers

Low Power Medical Devices

*See table on page 2 for available options.

Typical applicaTion

4.35V TO 5.5V

SYSTEM

LOAD

OUT

BUS

USB INPUT

10µF

100k

Battery Drain Current

vs Temperature

NTC

CHRG

LTC3554

PROG

BAT

100k

Li-Ion

= 3.8V

BAT

1.87k

BATTERY

STBY = 3.8V

REGULATORS LOAD = 0mA

BOTH REGULATORS

ENABLED

HPWR

SUSP

BVIN

2.2µF

4.7µH

ONE REGULATOR ENABLED

3.3V

PWR_ON1

SW1

FB1

200mA

2.05M

10pF

10µF

BOTH REGULATORS DISABLED

FSEL

649k

STBY

HARD RESET

PGOOD

PWR_ON2

PBSTAT

10µH

10pF

1.2V

200mA

–75 –50 –25

25 50 75 100 125

SW2

TEMPERATURE (°C)

332k

649k

3554 TA01b

FB2

3554 TA01a

ON/OFF

3554123ff

12 3 4 5 6 7...36

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与LTC3554相关器件

型号	品牌	描述	获取价格	数据表
LTC3554_15	Linear	Micropower USB Power Manager with Li-Ion Charger and Two Step-Down Regulators	获取价格
LTC3554-1_15	Linear	Micropower USB Power Manager with Li-Ion Charger and Two Step-Down Regulators	获取价格
LTC3554-2_15	Linear	Micropower USB Power Manager with Li-Ion Charger and Two Step-Down Regulators	获取价格
LTC3554-3_15	Linear	Micropower USB Power Manager with Li-Ion Charger and Two Step-Down Regulators	获取价格
LTC3554EPD	Linear	Micropower USB Power Manager with Li-Ion Charger and Two Step-Down Regulators	获取价格
LTC3554EPDPBF	Linear	Micropower USB Power Manager with Li-Ion Charger and Two Step-Down Regulators	获取价格

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