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MB3828 Datasheet, PDF (3/26 Pages) Fujitsu Component Limited. – Pentium DC/DC Converter IC | |||
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MB3828
s PIN DESCRIPTION
Pin no.
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
Symbol
RT
RS
SGND
CS
âIN
FB
ENB
OUT1
VS
CB
OUT2
PGND
VB
VD0
VD1
VD2
VD3
VD4
CTL
VSENSE
PWRGOOD
CSCP
VCC
VREF
I/O
Descriptions
â Triangular wave frequency setting resistor connection pin
â Discharging resistor connection pin for soft start capacitor
â Ground pin
â Soft start capacitor connection pin (Also used for discharge control)
I Error amplifier inverted input pin
O Error amplifier output pin
I Discharge control function enable/disable switch control pin
O Totem-pole output pin (External main-side FET gate drive)
â External main-side FET source-side connection
â Output bootstrap pin
Insert a capacitor between the CB and VS pins, to bootstrap the IC internal
output transistor.
O Totem-pole output pin (External synchronous rectifier-side FET gate drive)
â Ground pin
â Output circuit power supply pin
I 5-bit digital input pin used to set DC/DC converter output voltage
I 5-bit digital input pin used to set DC/DC converter output voltage
I 5-bit digital input pin used to set DC/DC converter output voltage
I 5-bit digital input pin used to set DC/DC converter output voltage
I 5-bit digital input pin used to set DC/DC converter output voltage
I Power supply control pin
The CTL pin is set to âLâ level to place the IC in standby mode.
I PWRGOOD circuit input pin
O PWRGOOD output pin (open-drain output)
Outputs a âHâ level signal when the output voltage is within the range from
VTLOW to VTHIGH.
â Timer-latch short-circuit protection capacitor connection pin
â Power supply pin for reference power and control circuit
O Reference voltage output pin
3
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