Datasheet > LTC1730

LTC1730

更新时间： 2023-12-20 18:46:09

品牌	Logo	应用领域
亚德诺 - ADI		电池脉冲
页数	文件大小	规格书
12页	163K
描述
具过流保护功能的锂离子电池脉冲充电器

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LTC1730 数据手册

LTC1730-4/LTC1730-4.2

Lithium-Ion Battery

Pulse Charger with

Overcurrent Protection

DESCRIPTIO

FEATURES

The LTC^®1730 is a complete pulse charger for 1-cell

lithium-ion batteries. When charging a depleted cell, the

internal MOSFET is fully on allowing the current limited

input power source to provide charge current to the

battery,virtuallyeliminatingheatgenerationinthecharger.

■

Complete Pulse Charger for 1-Cell Lithium-Ion

Batteries

■

Sense Resistor Limits Maximum Current for Safety

■

1% Float Voltage Accuracy

■

End-of-Charge (C/10) Detection Output

■

Programmable Charge Termination Timer

As the battery accepts charge and approaches the pro-

grammed voltage, the internal MOSFET begins switching

off and on with the duty cycle gradually decreasing as the

battery approaches a fully charged condition. A program-

mable timer ends the charge cycle. The end-of-charge

condition is indicated at the CHRG pin when the average

charge current falls to C/10. Removing the input voltage

puts the LTC1730 into a sleep mode, dropping the battery

current drain to less than 1µA (maximum).

■

Internal 0.35Ω NMOS Switch

No Blocking Diode Required

■

SEL Pin to Set Either 4.1V or 4.2V/Cell (LTC1730-4)

■

Low-Battery Drain (1µA Max) when Input Supply Is

Removed

■

Battery Temperature Sensing and Charge

Qualification

■

Automatic Trickle Charge for Low-Battery

■

Automatic Battery Refresh

An external sense resistor limits the maximum charge

current as a safety precaution against a user connecting a

wall adapter with the incorrect or no current limit. The

internal MOSFET prevents reverse battery current from

flowing if the input voltage is shorted to ground, eliminat-

ing the need for a blocking diode.

APPLICATIO S

■

Standalone Lithium-Ion Battery Charger

Handheld Computers

Cellular Telephones

■

The LTC1730-4 is available in the 16-pin SSOP package

and the LTC1730-4.2 is available in the 8-pin SO package.

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

TYPICAL APPLICATIO

1A, Single Cell 4.2V Li-Ion Battery Charger (8-Pin Package)

= 4.5V TO 12V

WITH 1A CURRENT LIMIT

10k

4.7Ω

SENSE

0.05Ω

1µF

0.047µF

4.1k

LTC1730ES8-4.2

CHARGE STATUS

GATE

0.022µF

CHRG

SENSE

NTC/SHDN

BAT

1-CELL

Li-Ion

BATTERY

10k

NTC*

TIMER

GND

TIMER

0.1µF

*NTC: DALE NTHS-1206N02

1730 TA01

sn1730 1730fs

12 3 4 5 6 7...12

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