MC33349N-4R1 Просмотр технического описания (PDF) - ON Semiconductor

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производитель

MC33349N-4R1

Lithium Battery Protection Circuit for One Cell Battery Packs

ON Semiconductor 

MC33349

+

R1

100

W

C1

0.01µF

5

4

C3

0.01µF

6

MC33349

2

1

3

C2

0.22µF

R1k2W

–

Figure 23. Typical Application Circuit

Technical Notes

W R1 and C1 will stabilize a supply voltage to the MC33349. A recommended R1 value is less than 1 k . A larger value of R1

leads to higher detection voltage because of shoot through current into the IC.

R2 and C2 stabilize P– pin voltage. Larger R2 values could possibly disable reset from over–discharge by connecting a charger.

W Recommended values are less than 1 k . After an over–charge detection even connecting a battery pack to a system could

probably not allow a system to draw load current if one uses a larger R2C2 time constant. The recommended C2 value is less

than 1µF.

R1 and R2 can operate as a current limiter against setting cell reverse direction or for applying excess charging voltage to the

IC and battery pack. Smaller R1 and R2 values may cause excessive power consumption over the specified power dissipation

W rating. Therefore R1+R2 should be more than 1 k .

The time constants R1C1 and R2C2 must have a relation as follows:

R1C1 ≤ R2C2

If the R1C1 time constant for the Vcell pin is larger than the R2C2 time constant for the P– pin, the IC might enter a standby

mode after detecting excess current. This was noted in the operating description of the current detectors.

ORDERING INFORMATION

Device

Overvoltage

Threshold (V)

Undervoltage

Threshold (V)

Current Limit

Threshold (V)

Marking

MC33349N–3R1

4.25

2.5

0.2

A1xx*

MC33349N–4R1

4.25

2.5

0.075

A2xx*

MC33349N–7R1

4.35

2.5

0.2

A0xx*

* ″xx″ denotes the date code marking.

Consult factory for information on other threshold values.

Reel Size Tape width

7”

8 mm

Quantity

3000

http://onsemi.com

10

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