Datasheet > LTC4078

LTC4078

更新时间： 2023-12-20 18:46:16

品牌	Logo	应用领域
亚德诺 - ADI		电池
页数	文件大小	规格书
16页	198K
描述
具过压保护功能的双输入锂离子电池充电器

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LTC4078 数据手册

LTC4078/LTC4078X

Dual Input Li-Ion Battery

Charger with Overvoltage Protection

FEATURES

DESCRIPTION

The LTC^®4078/LTC4078X are standalone linear chargers

that are capable of charging a single-cell Li-Ion/Polymer

batteryfrombothwalladapterandUSBinputs.Thechargers

can detect power at the inputs and automatically select

the appropriate power source for charging.

22V Maximum Voltage for Wall Adapter and

USB Inputs

Charge Single-Cell Li-Ion Batteries from Wall

Adapter and USB Inputs

Automatic Input Power Detection and Selection

Charge Current Programmable Up to 950mA from

Wall Adapter Input

Overvoltage Lockout for Wall Adapter and USB Inputs

Battery Detection Input Disables Charger When No

Battery is Present

No External MOSFET, Sense Resistor or Blocking

Diode Needed

No external sense resistor or blocking diode is required

for charging due to the internal MOSFET architecture. The

LTC4078/LTC4078Xfeatureamaximum22Vratingforboth

wall adapter and USB inputs, although charging stops if

the selected power source exceeds the overvoltage limit.

Internal thermal feedback regulates the battery charge

current to maintain a constant die temperature during

high power operation or high ambient temperature con-

ditions. The ﬂoat voltage is ﬁxed at 4.2V and the charge

current is programmed with an external resistor. The

LTC4078/LTC4078X terminate the charge cycle when the

charge current drops below the programmed termination

threshold after the ﬁnal ﬂoat voltage is reached.

Thermal Regulation Maximizes Charge Rate Without

Risk of Overheating*

Preset Charge Voltage with 0.ꢀ6 ꢁccuracy

Programmable Charge Current Termination

40μꢁ USB Suspend Current in Shutdown

Charge Status Output

ꢁutomatic Recharge

Otherfeaturesincludebatterypresentdetection,automatic

recharge,undervoltagelockout,chargestatusoutputs,and

“powerpresent”statusoutputstoindicatethepresenceof

wall adapter or USB power. The device is offered in a low

proﬁle (0.75mm) 3mm × 3mm 10-lead DFN package.

ꢁvailable Without Trickle Charge (LTC4078X)

ꢁvailable in a Thermally Enhanced, Low Proﬁle

(0.75mm) 10-Lead (3mm × 3mm) DFN Package

APPLICATIONS

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

ꢁll other trademarks are the property of their respective owners.

*Protected by U.S. Patents including ꢀ522118, ꢀ7003ꢀ4.

Cellular Telephones

Handheld Computers

Portable MP3 Players

Digital Cameras

TYPICAL APPLICATION

Charger Current vs Supply Voltage

900

= 1.24k

= 2k

IDC

IUSB

High Voltage Dual Input Battery Charger

800

700

ꢀ00

500

400

300

200

100

= 3.5V

BꢁT

BꢁTDET

for Li-Ion Battery Pack

= 0V

800mꢁ (WꢁLL)

500mꢁ (USB)

CHꢁRGE FROM DCIN

LTC4078

WꢁLL

ꢁDꢁPTER

DCIN

BꢁT

USB

USBIN BꢁTDET

IUSB

4.2V

Li-Ion

CHꢁRGE

FROM USBIN

PORT

1μF

3.9k

BꢁTTERY

PꢁCK

IDC

ITERM

1μF

1.24k

GND

ꢀ

19 20

4078X Tꢁ01

SUPPLY VOLTꢁGE (V)

4078x Tꢁ01b

4078xfb

12 3 4 5 6 7...16

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与LTC4078相关器件

型号	品牌	描述	获取价格	数据表
LTC4078_15	Linear	Dual Input Li-Ion Battery Charger with Overvoltage Protection	获取价格
LTC4078EDD#PBF	Linear	LTC4078/LTC4078X - Dual Input Li-Ion Battery Charger with Overvoltage Protection; Package:	获取价格
LTC4078EDD#TRPBF	Linear	LTC4078/LTC4078X - Dual Input Li-Ion Battery Charger with Overvoltage Protection; Package:	获取价格
LTC4078X	Linear	Dual Input Li-Ion Battery Charger with Overvoltage Protection	获取价格
LTC4078X_15	Linear	Dual Input Li-Ion Battery Charger with Overvoltage Protection	获取价格
LTC4078XEDD#PBF	Linear	LTC4078/LTC4078X - Dual Input Li-Ion Battery Charger with Overvoltage Protection; Package:	获取价格

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