BQ24742 Datasheet, PDF (28/35 Pages) Texas Instruments – Li-Ion or Li-Polymer Battery Charger with Low Iq and Accurate Trickle Charge

bq24741, bq24742
SLUS875B – MARCH 2009 – REVISED OCTOBER 2009
REVISION HISTORY
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Changes from Revision A (March 2009) to Revision B
Page
• Changed 8 V to 9 V .............................................................................................................................................................. 1
• Changed "Cells pin support two to for Li-Ion cells up to 18 V battery voltage" to Support two to four cells ........................ 1
• Added "FET/Inductor/Battery Short Protection" .................................................................................................................... 1
• Added "Loop Compensation" ................................................................................................................................................ 1
• Deleted "Internal Loop Compensation" bullet ....................................................................................................................... 1
• Added "Quiescent Current" ................................................................................................................................................... 1
• Added 10Ω R16 to top of schematic ..................................................................................................................................... 2
• Added 10Ω R16 to top of schematic ..................................................................................................................................... 3
• Changed bq24742RHDR to bq24742RHDT ......................................................................................................................... 3
• Changed 8.0 V to 9.0 V in condition values ......................................................................................................................... 6
• Changed min voltage from 8 to 9 for V_{PVCC_OP} parameter .................................................................................................... 6
• Deleted VBAT_OP parameter from this section ................................................................................................................... 6
• Changed 8.0 V to 9.0 V in condition values ......................................................................................................................... 7
• Changed 8.0 V to 9.0 V in condition values ......................................................................................................................... 8
• Changed "Short Circuit" to "MOSFET short" ........................................................................................................................ 8
• Changed VLS max value from 280 to 320 ........................................................................................................................... 8
• Changed all instances of V_PH to V_SW in following section ..................................................................................................... 8
• Changed 8.0 V to 9.0 V in condition values ......................................................................................................................... 9
• Deleted VCC pin ................................................................................................................................................................... 9
• Added graph: "Near 100% Duty Cycle.." ............................................................................................................................ 15
• Changed polarity of IIN_ER, BAT_ER, and ICH_ER op amps ........................................................................................... 16
• Added text note under equation .......................................................................................................................................... 17
• Changed 8ms to 2ms .......................................................................................................................................................... 20
• Changed "This PVCC voltage could come from either input adapter or battery, using a diode-OR input." ....................... 20
• Added then the charger will soft-start again if all other enable change conditions are valid. ............................................. 21
• Added added text, equations and illustrations from Inductor Selection to PCB Layout ..................................................... 23
28
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