MB3828 查看數據表（PDF） - Fujitsu

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MB3828

Pentium® DC/DC Converter IC

Fujitsu 

MB3828

s CTL LOGIC CIRCUIT OPERATION TIMING CHART

CTL signal

ENB signal

VREF output voltage

CS pin voltage

DC/DC

output voltage

0.05 V

ts

toff

s DC/DC CONVERTER INPUT VOLTAGE (Vin) AND VB VOLTAGE SETTING

The voltage at the CB pin is bootstrapped from the VS pin voltage by an amount equivalent to the VB pin voltage,

as a result of the bootstrap capacitance (CB) between the CB pin and VS pin. Therefore, either the Vin voltage

or VB pin voltage should be adjusted so that the sum of the DC/DC converter block input voltage Vin plus the

VB pin voltage does not exceed the recommended operating conditions for the CB pin boot voltage (VCB).

Drive

1

Drive

2

VB

13

*1

CB

10

OUT1

8

VS

9

*2

CB

OUT2

*2

11

PGND

12

DC/DC converter block

Vin

VB

VO

*1: To connect the external low VF diode (Schottky barrier diode) makes VB pin voltage drop reduced

and then can perform the higher efficiency.

*2: The switching noise can be reduced (0Ω to 5Ω) by connecting the resistance when the external

MOSFET gate input capacitance (Ciss) is large, caused by the external MOSFET gate drive

current limiting resistance.

18

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