2760A25 查看數據表（PDF） - Maxim Integrated

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2760A25

High-Precision Li+ Battery Monitor

Maxim Integrated 

DS2760

charge FET back on (unless another protection condition prevents it). Discharging remains enabled

during overvoltage.

Undervoltage. If the voltage of the cell drops below undervoltage threshold VUV for a period longer than

undervoltage delay tUVD, the DS2760 shuts off the charge and discharge FETs, sets the UV flag in the

Protection Register, and enters Sleep Mode. The DS2760 provides a current-limited (IRC) recovery

charge path from PLS to VDD to gently charge severely depleted cells. The recovery path is enabled

when 0 £ VDD < 3V(typ). Once VDD reaches 3V(typ), the DS2760 will return to normal operation,

awaiting connection of a charger to turn on the charge FET and pull out of Sleep Mode.

Overcurrent, Charge Direction. The voltage difference between the IS1 pin and the IS2 pin (VIS = VIS1

– VIS2) is the filtered voltage drop across the current sense resistor. If VIS exceeds overcurrent threshold

VOC for a period longer than overcurrent delay tOCD, the DS2760 shuts off both external FETs and sets the

COC flag in the Protection Register. The charge current path is not re-established until the voltage on the

PLS pin drops below VDD – VTP. The DS2760 provides a test current of value ITST from PLS to VSS to

pull PLS down in order to detect the removal of the offending charge current source.

Overcurrent, Discharge Direction. If VIS is less than –VOC for a period longer than tOCD, the DS2760

shuts off the external discharge FET and sets the DOC flag in the Protection Register. The discharge

current path is not re-established until the voltage on PLS rises above VDD – VTP. The DS2760 provides a

test current of value ITST from VDD to PLS to pull PLS up in order to detect the removal of the offending

low-impedance load.

Short Circuit. If the voltage on the SNS pin with respect to VSS exceeds short circuit threshold VSC for

a period longer than short circuit delay tSCD, the DS2760 shuts off the external discharge FET and sets the

DOC flag in the Protection Register. The discharge current path is not re-established until the voltage on

PLS rises above VDD – VTP. The DS2760 provides a test current of value ITST from VDD to PLS to pull

PLS up in order to detect the removal of the short circuit.

LITHIUM-ION PROTECTION CIRCUITRY EXAMPLE WAVEFORMS Figure 3

VCELL

charge

VIS

discharge

(1)

CC

tOVD

tOVD

tOCD

VOV

VCE

VUV

VOC

0

-VOC

-VSC

VPLS

VSS

DC

tSCD

tOCD

VDD

tUVD

VSS

Sleep

Mode

active

inactive

(1) To allow the device to react quickly to short circuits, detection is actually done on the SNS pin rather

than on the filtered IS1 and IS2 pins. The actual short circuit detect condition is VSNS > VSC.

7

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