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

OPERATION

The USB power status open drain output (USBPWR) has

two states: pull-down and high impedance. The high imped-

ance state indicates that the LTC4075HVX is being powered

from the USBIN input. The pull-down state indicates that

the charger is either powered from DCIN or is in a UVLO

or an OVLO condition (see Table 1).

Thermal Limiting

An internal thermal feedback loop reduces the programmed

charge current if the die temperature attempts to rise

above a preset value of approximately 125°C. This feature

protects the LTC4075HVX from excessive temperature and

allows the user to push the limits of the power handling

capability of a given circuit board without risk of damag-

ing the device. The charge current can be set according

to typical (not worst-case) ambient temperature with the

assurance that the charger will automatically reduce the

current in worst case conditions. DFN package power

considerations are discussed further in the Applications

Information section.

DCIN POWER REMOVED

ENABLE = LOW

NO POWER

USB POWER REMOVED

POWER APPLIED

ENABLE = HIGH

6V > DCIN > 4.15V and

NO

DCIN > BAT

YES

CHARGE MODE

(DCIN)

FULL CURRENT

CHRG STATE: PULLDOWN

IBAT < ITERMINATE

IN VOLTAGE MODE

BAT < 4.075V

STANDBY MODE

(DCIN)

NO CHARGE CURRENT

CHRG STATE: Hi-Z

YES

DCIN > 4.15V and

DCIN > BAT

NO

NO 6V > USBIN > 3.95V and

USBIN > BAT

YES

CHARGE MODE

(USBIN)

FULL CURRENT

CHRG STATE: PULLDOWN

IBAT < ITERMINATE

IN VOLTAGE MODE

STANDBY MODE

(USBIN)

NO CHARGE CURRENT

CHRG STATE: Hi-Z

BAT < 4.075V

SHUTDOWN MODE

(DCIN)

CHRG STATE: Hi-Z

SHUTDOWN MODE

(USBIN)

CHRG STATE: Hi-Z

4075hvx F01

Figure 1. LTC4075HVX State Diagram of a Charge Cycle

4075hvxf

11

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