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MC33348D-1

Lithium Battery Protection Circuit for One Cell Battery Packs

ON Semiconductor 

MC33348

Figure 12. Additional Discharge Current Limit Delay

3

Cdly

MC33348

84

6

5

Rdly

The discharge current limit shutdown delay time is typically 3.0 ms.

This time can be extended with the addition of components Rdly and

Cdly. With an Rdly of 5.1 k and Cdly of 10 μF, the current limit shutdown

time is extended to 40 ms.

The additional discharge current limit delay circuitry must not be

used if the anticipated open−circuit charger voltage will exceed 6.0 V.

When the charger causes the battery pack input to exceed 6.0 V,

additional current will flow out of Pin 5, creating a voltage drop across

resistor Rdly. This voltage drop causes the source of MOSFET Q1 to

fall below it’s gate, allowing it to unexpectedly turn back on.

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