TSZ02201-0P2P0C001400-1-2

16.Nov.2020 Rev.006

TSZ22111 • 15 • 001

26/36

BD64547MUV

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4

Protection Functions ― continued

4.4

Soft Start (at power-on, with ENBSW2 = L)

4.5

Operation Timing of malfunction protection circuit at output low voltage protection (SWREG2)

This IC has a built-in malfunction protection circuit at low voltage (Under Voltage Lock Out: UVLO circuit) to

prevent false operation such as the output during power supply under voltage. When the applied voltage to the

VINSW2 pin goes under 2.45 V (Typ), the output is set to OFF state. This switching voltage has a 0.2 V (Typ)

hysteresis to prevent false operation by noise etc. This value is design level and is not the guaranteed value that

is measured by total inspection.

Figure 14. SWREG2 Protection Operate Timing and Soft Start Timing

Parameter

Specification

Unit

Min

Typ

Max

0.8

1.0

1.2

ms

0 V

0 V

UVLO OFF

UVLO ON

2.65 V

2.45 V

HYS

UVLO

Normal operation

Normal operation

Low-side

MOSFET Gate

High-side

MOSFET Gate

VINSW2

ENBSW2

FB2: 0.8 V (Typ)

±0.5 % (0 °C

≤ Tj ≤ 125 °C)