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UCC3957MTR-3 Datasheet(PDF) 5 Page - Texas Instruments |
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UCC3957MTR-3 Datasheet(HTML) 5 Page - Texas Instruments |
5 / 15 page UCC39571, UCC39572, UCC39573, UCC39574 SLUS236B – JANUARY 1999 – REVISED SEPTEMBER 2002 5 www.ti.com APPLICATION INFORMATION overview The UCC3957 provides complete protection against overdischarge, overcharge and overcurrent for a three- or four-cell lithium-ion battery pack. It uses a flying capacitor technique to sample the voltage across each battery cell and compare it to a precision reference. If any cell is in overvoltage or undervoltage, the internal-state machine takes the appropriate action to prevent further charge or discharge. High-side P-channel MOSFETs are used to independently control charge and discharge current. Figure 1 shows a three-cell lithium-ion protector application diagram with the optional charge-enable switch. In this application, the diode D1 protects the MOSFET Q2 from inductive kick at turn-off. UDG–98016 1 3 2 4 DVDD VDD CLCNT WU AN1 AN2 AN3 AN4 BATLO CHGEN AN4 CHG CDLY2 AVDD CDLY1 5 7 6 8 16 14 15 13 12 10 11 9 C3 OPTIONAL + + + PACK (–) Q1 IFR7416 CHARGE Q3 2N7002 LI–ION BATTERY STACK S1 CLOSE TO ENABLE CHARGING Q2 IFR7416 DISCHARGE R1 1 M Ω C1 0.1 µF C2 0.1 µF RSENSE 0.025 Ω C5 4.7 µF 25 V DCHG C4 0.022 µF PACK (+) D1 1 A, 50 V Figure 1. Three-Cell Lithium-Ion Protector Application Diagram Not Recommended for New Designs |
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Similar Description - UCC3957MTR-3 |
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