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LTC4410 Datasheet(PDF) 5 Page - Linear Technology |
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LTC4410 Datasheet(HTML) 5 Page - Linear Technology |
5 / 8 page 5 LTC4410 sn4410 4410fs OPERATIO The LTC4410 manages the total current consumption between a battery charger and a USB portable device. In a system using the LTC4410, a battery charger can be set up to charge at the maximum available current from the USB port without any need to reserve current for the device load. As the USB device current increases, the LTC4410 decreases the battery charge current so as not to exceed the maximum allowable current from the USB port. This allows for simultaneous battery charging and device operation. The LTC4410 can only reduce the bat- tery charge current to zero. It is the responsibility of the USB device load to not exceed the USB power limits. The LTC4410 uses an internal power MOSFET to sense load current. This MOSFET is held off when VOUT > VIN or VIN < 4.2V (typ). A replica of the IVOUT current equal to IVOUT/1000 is sourced out of the CHP pin with an accuracy of ±6%. This current can be summed into the PROG node of a battery charger to reduce the charge current. The LTC4410 is primarily designed to interface with battery chargers that use a program pin to set the maximum charge current, with a charge current to program pin current ratio of 1000:1. The voltage on CHP can be externally monitored to signal overcurrent conditions. When VIN > 4.2V, the internal USB present comparator forces the USBP pin high. This signal can be used to detect when the USB voltage is present and drive an external switch to connect or disconnect a battery from the USB peripheral. The MODE pin controls the state of an internal 370µA current reference (IREF). When active (MODE pin low), the total current sourced out of CHP is IVOUT/1000 +IREF. The primary function of the current reference is to offset the battery charger charge current for 100mA mode. When MODE is high, the current reference is disabled. The total current out of CHP with MODE high is IVOUT/1000. The MODE controlled current offset makes it possible to con- figure the battery charger and the LTC4410 to support the USB specification 1.0 and 2.0 required 100mA and 500mA modes of operation. The low quiescent current (80µA, when MODE is high) of the LTC4410 makes the system easily compliant with the USB specifications 1.0 and 2.0 SUSPEND MODE current consumption requirements. When VOUT > VIN, the LTC4410 transitions to low power mode, draining 1µA (typical) from the Lithium-Ion battery. This condition occurs when the USB device is operating off of its internal battery and not connected to the USB port. |
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