DS2720BU データシートの表示（PDF） - Dallas Semiconductor -> Maxim Integrated

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DS2720BU

Efficient, Addressable Single-Cell Rechargeable Lithium Protection IC

Dallas Semiconductor -> Maxim Integrated 

DS2720

Overvoltage. If the cell voltage sensed at VDD exceeds overvoltage threshold VOV for a period longer

than overvoltage delay tOVD, the DS2720 shuts off the external charge FET and sets the OV flag in the

protection register. Discharging remains enabled during overvoltage. The charge FET is re-enabled

(unless another protection condition prevents it), when the cell voltage falls below charge enable

threshold VCE, or a discharge causes VDD - VPLS > VOC.

Undervoltage. If the cell voltage sensed at VDD drops below undervoltage threshold VUV for a period

longer than undervoltage delay tUVD, the DS2720 shuts off the charge and discharge FETs, sets the UV

flag in the protection register, and enters sleep mode. The DS2720 turns on both the charge and discharge

FETs after the cell voltage rises above VUV and a charger is present.

Short Circuit. If the cell voltage sensed at VDD drops below depletion threshold VSC for a period of tSCD,

the DS2720 shuts off the charge and discharge FETs and sets the DOC flag in the protection register. The

current path through the charge and discharge FETs is not re-established until the voltage on PLS rises

above VDD - VOC. The DS2720 provides a test current through internal resistor RTST from VDD to PLS to

pull up PLS when VDD rises above VSC. The test current allows the DS2720 to detect the removal of the

offending low-impedance load. Additionally, a recovery charge path through RTST from PLS to VDD is

enabled.

Overcurrent. If the voltage across the protection FETs (VDD - VPLS) is greater than VOC for a period

longer than tOCD, the DS2720 shuts off the external charge and discharge FETs and sets the DOC flag in

the protection register. The current path is not re-established until the voltage on PLS rises above VDD -

VOC. The DS2720 provides a test current through internal resistor RTST from VDD to PLS to detect the

removal of the offending low-impedance load.

Overtemperature. If the device temperature exceeds TMAX, the DS2720 immediately shuts off the

external discharge and charge FETs. The FETs are not turned back on until the cell temperature drops

below TMAX AND the host resets the OT bit.

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