LV51142T Datasheet, PDF (4/13 Pages) Sanyo Semicon Device – CMOS IC 1-Cell Lithium-Ion Battery Protection IC

Block Diagram
LV51142T
VDD
Oscillator
Level
Counter
Shifter
CO
Control Circuit
Short Detector
-
+
+
VM
Over-charge
-
Detector
Charge
Over-current
Detector
+
-
+
DO
Over-discharge
Detector
-
Discharge
Over-current
Detector
VSS
Measurement Conditions
• Over-charge detection voltage, Over-charge hysteresis voltage --- [Circuit 1]
Set V1 = 3.0V and V2 = 0V. Over-charge detection voltage VC is V1 at which VCO goes "Low" from "High" when V1
is gradually increased from 3.0V. Then IC is released from the over-charge state and VCO goes "High" from "Low" at
the voltage "Measured VC-VHc" when V1 is gradually decreased.
If V2 is set to the greater value than discharge over-current detection voltage VIdc in the over-charge state, VHc is
canceled and then IC is released from the over-charge state at VC.
• Over-discharge detection voltage --- [Circuit 1]
Set V1 = 3.0V and V2 = 0V. Over-discharge detection voltage Vdc is V1 at which VDO goes "Low" from "High" when
V1 is gradually decreased from 3.0V. Next, set V2 under to charge over-current detection voltage VIc. Then IC is
released from the over-discharge state at Vdc and VDO goes "High" from "Low".
• Charge over-current detection voltage --- [Circuit 2]
Set V1 = 3.0V and V2 = 0V. Charge over-current detection voltage VIc is V2 at which VCO goes "Low" from "High"
when V2 is gradually decreased from 0V.
• Discharge over-current detection voltage --- [Circuit 2]
Set V1 = 3.0V and V2 = 0V. Discharge over-current detection voltage VIdc is V2 at which VDO goes "Low" from
"High" when V2 is gradually increased from 0V.
• Load short-circuiting detection voltage --- [Circuit 2]
Set V1 = 3.0V and V2 = 0V. Load short-circuiting detection voltage Vshort is V2 at which VDO goes "Low" from
"High" within a time between the minimum and the maximum value of load short-circuiting detection delay time tshort,
when V2 is increased rapidly within 10μs.
• 0V battery charge starting charger voltage --- [Circuit 3]
Set V1 = V2 = 0V and decrease V2 gradually. 0V battery charge starting charger voltage Vcha is V2 when VCO goes
"High" (V1-0.1V or higher).
Continued on next page.
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