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SI9730ABY-T1 Datasheet(PDF) 1 Page - Vishay Siliconix

No. de pieza SI9730ABY-T1
Descripción Electrónicos  Dual-Cell Lithium Ion Battery Control IC
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Fabricante Electrónico  VISHAY [Vishay Siliconix]
Página de inicio  http://www.vishay.com
Logo VISHAY - Vishay Siliconix

SI9730ABY-T1 Datasheet(HTML) 1 Page - Vishay Siliconix

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Si9730
Vishay Siliconix
Document Number: 70658
S-40135—Rev. F, 16-Feb-04
www.vishay.com
1
Dual-Cell Lithium Ion Battery Control IC
FEATURES
D Over-Charge Protection
D Over-Discharge Protection
D Short Circuit Current Limiting
D Battery Open-Circuit Center Tap Protection
D Cell Voltage Balancing
D Undervoltage Lockout
D Individual Cell Voltage Monitoring
D Low Operating Current (30 mA) and Shutdown Current (1 mA)
D Internal N-Channel MOSFET Driver
D High Noise Immunity
D Accurate ("1.19%) Over-Charge Voltage Detection
D Four Different Cell Types Covered
DESCRIPTION
The Si9730 monitors the charging and discharging of dual-cell
lithium-ion battery packs (carbon or coke chemistry) ensuring
that battery capacity is fully utilized while ensuring safe
operation.
The Si9730 provides protection against
overcharge, over-discharge, and short circuit conditions which
are hazardous to the battery and the environment.
Battery voltages of each individual cell are monitored at the
center-tap connection by an internal A/D converter through the
VC pin. If one or both of the cells is determined to be
overcharged, an internal cell balancing network “bleeds” off
current at 15 mA until both cells are charged to the same
maximum level. Depending on the condition of each cell, the
Si9730 will switch two external source-connected n-channel
MOSFETs on or off to allow the cells to be charged or to
provide current to the load.
The Si9730 is available in an 8-pin SOIC package with an
operating temperature range of −25 to 85°C. The Si9730 is
available in both standard and lead (Pb)-free packages.
FUNCTIONAL BLOCK DIAGRAM AND PIN CONFIGURATION
VDD
Cell Balancing
Network
A/D
Converter
OUT
Oscillator
VC
1.2 VREF
VSS
Undervoltage
Lockout
Control
Logic
Timer
CDELAY
Time Out
CLK
DCO
IS
VSS
VM
SOUT
GS Generator
ILIMIT
VM
C
+
VC1
+
VC2


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