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LTC4075HVXEDD Datasheet(PDF) 11 Page - Linear Technology |
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LTC4075HVXEDD Datasheet(HTML) 11 Page - Linear Technology |
11 / 16 page 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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