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| DN-96 Design Note UCC3952 Demonstration Board Schematic and List of Materials By David Salerno INTRODUCTION The UCC3952 demo board provides complete protection for a single Lithium-ion cell, including Overcharge, Over-discharge and short circuit protection. The application schematic is shown in Fig. 1 and a component placement is shown in Fig. 2. A list of materials, giving the component part numbers and case sizes is given in Table 1. Note that the UCC3952, using an internal MOSFET switch, requires only a single external decoupling capacitor to provide a complete protection solution. DEMO BOARD FEATURES * Small (5.5mm x 22.5mm) two sided board with only two components. * Integrated low impedance MOSFET switch and current sensor (50m time delay (typical) typical) * Overcharge protection, with built-in 1.5 second * High accuracy 1.0% tolerance on Overcharge threshold (over temperature) * Four standard Overcharge thresholds are available (4.20, 4.25, 4.30 4.35V) * Over-discharge protection, with built-in 15msec time delay (typical) * Overload/short circuit protection with built-in 1.5msec time delay (typical) * Automatic recovery from short circuit when load * * * * * C+ is removed Reverse charger protection (up to -8V) Runaway charger protection (up to +16V) Overtemp protection Low operating current of 5A (typical) Low Sleep mode current of 1.5A (typical) P+ TCLK PACK+ N/C CBPS BNEG CONNECT TO CELL PACK- PACK OUTPUT BNEG PACK- BNEG PACK- C1 0.1F BNEG PACK- BNEG PACK- C- BNEG PACK- P- UDG-99024 Figure 1. Application schematic 07/99 DN-96 PACK+ PACK- CELL+ C1 U1 PIN1 CELL- UDG-99024 Figure 2. Component layout and connection points. Table I. Evaluation board list of materials Designator C1 U1 Description 0.1F, 16V ceramic cap (X7R type), 0805 chip 16 pin TSSOP Part Number AVX 0805YC104KAT2A UCC3952PW - 1/-2/-3/-4 UNITRODE CORPORATION 7 CONTINENTAL BLVD. * MERRIMACK, NH 03054 TEL. (603) 424-2410 * FAX (603) 424-3460 2 |
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