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LTC4075HVX Datasheet(PDF) 11 Page - Linear Technology

Part # LTC4075HVX
Description  High Voltage Dual Input Li-Ion/Polymer Battery Charger
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Manufacturer  LINER [Linear Technology]
Direct Link  http://www.linear.com
Logo LINER - Linear Technology

LTC4075HVX Datasheet(HTML) 11 Page - Linear Technology

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LTC4075HVX
11
4075hvxf
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
OPERATION
Figure 1. LTC4075HVX State Diagram of a Charge Cycle
SHUTDOWN MODE
(USBIN)
CHRG STATE: Hi-Z
CHARGE MODE
(DCIN)
FULL CURRENT
CHRG STATE: PULLDOWN
CHARGE MODE
(USBIN)
FULL CURRENT
CHRG STATE: PULLDOWN
STANDBY MODE
(DCIN)
NO CHARGE CURRENT
CHRG STATE: Hi-Z
SHUTDOWN MODE
(DCIN)
CHRG STATE: Hi-Z
YES
BAT < 4.075V
BAT < 4.075V
IBAT < ITERMINATE
IN VOLTAGE MODE
IBAT < ITERMINATE
IN VOLTAGE MODE
NO POWER
STANDBY MODE
(USBIN)
NO CHARGE CURRENT
CHRG STATE: Hi-Z
6V > USBIN > 3.95V and
USBIN > BAT
NO
NO
YES
YES
6V > DCIN > 4.15V and
DCIN > BAT
NO
DCIN > 4.15V and
DCIN > BAT
ENABLE = LOW
ENABLE = HIGH
POWER APPLIED
DCIN POWER REMOVED
USB POWER REMOVED
4075hvx F01
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.


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