LTC4057 查看數據表（PDF） - Linear Technology

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LTC4057

900mA Linear Li-Ion Battery Chargers

Linear Technology 

LTC4057- 4.2

APPLICATIO S I FOR ATIO

VCC Bypass Capacitor

Many types of capacitors can be used for input bypassing;

however, caution must be exercised when using multi-

layer ceramic capacitors. Because of the self resonant and

high Q characteristics of some types of ceramic capaci-

tors, high voltage transients can be generated under some

start-up conditions, such as connecting the charger input

to a live power source. Adding a 1.5Ω resistor in series

with an X5R ceramic capacitor will minimize start-up

voltage transients. For more information, refer to Applica-

tion Note 88.

Charge Current Soft-Start

The LTC4057 includes a soft-start circuit to minimize the

inrush current at the start of a charge cycle. When charg-

ing begins, the charge current ramps from zero to the full-

scale current over a period of approximately 100µs. This

has the effect of minimizing the transient current load on

the power supply during startup.

4057f

10

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