MB3843PFV-G-BND データシートの表示（PDF） - Fujitsu

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MB3843PFV-G-BND

Lithium Ion Battery Charger DC/DC Converter IC (High Precision with Constant-current Function)

Fujitsu 

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MB3813A/MB3833A/MB3843

2. Output Voltage Switching Function

The SEL pin (pin 10) is capable of output levels of 4.2 V or 4.1 V per battery cell.

• Output voltage settings by model

SEL pin voltage level

L

H

L

H

L

H

Model

MB3813A

MB3833A

MB3843

Output voltage

12.6

12.3

8.4

8.2

4.2

4.1

Units

V

V

V

V

V

V

3. Protection Functions

(1) Input voltage detector circuit (VIDET)

When the input voltage supply from the AC adapter or other source detected at the Vin1 pin (pin 1) falls below

11 V (MB3813A), or below 7.3 V (MB3833A), or below 6.3 V (MB3843), the internal reference voltage circuit

switches off.

(2) Under voltage lockout circuit (UVLO)

Power surges at power-on, or momentary under-voltage situations can cause abnormal operation in a control

IC, which may lead to damage or deterioration in systems. This circuit prevents abnormal peration during times

of low voltage by using the supply voltage to detect the level of the internal reference voltage, and switching

off the external output transistor to create a 100% rest interval. Once the supply voltage recovers to a level

above the threshold voltage of the under voltage lockout circuit, operation is restored.

15

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