LTC4075HVXEDD 查看數據表（PDF） - Linear Technology

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LTC4075HVXEDD

High Voltage Dual Input Li-Ion/Polymer Battery Charger

Linear Technology 

LTC4075HVX

APPLICATIONS INFORMATION

In this circuit, capacitor C2 holds MN1 off when the cable

is first connected. Eventually C2 begins to charge up to the

USB input voltage applying increasing gate drive to MN1.

The long time constant of R1 and C1 prevent the current

from rapidly building up in the cable thus dampening out

any resonant overshoot.

Reverse Polarity Input Voltage Protection

In some applications, protection from reverse polarity

voltage on the input supply pins is desired. With sufficient

supply voltage, a series blocking diode can be used. In

other cases where the voltage drop must be kept low, a

P-channel MOSFET can be used (as shown in Figure 5).

DRAIN-BULK

DIODE OF FET

WALL

ADAPTER

LTC4075HVX

DCIN

4075hvx F05

Figure 5. Low Loss Reverse Polarity Protection

14

4075hvxf

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