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參數(shù)資料
| 型號： | MB3802 |
| 廠商： | FUJITSU LTD |
| 元件分類： | 電源管理 |
| 英文描述： | Power Management Switch(電源管理開關(guān)) |
| 中文描述： | POWER SUPPLY SUPPORT CKT, PDSO16 |
| 封裝： | PLASTIC, SOP-16 |
| 文件頁數(shù)： | 3/15頁 |
| 文件大?。?/td> | 104K |
| 代理商： | MB3802 |
3
MB3802
I
BLOCK DIAGRAM AND EXTERNAL CONNECTIONS
I
BLOCK DESCRIPTION
When V
IN
exceeds 2.2V, the Comp. starts driving the DC/DC converter to switch the N-ch MOS and applies the
optimum voltage for the switch gate.
The DC/DC converter boosts the V
IN
voltage.
When VIN is below 2.1V, the Comp. stops the DC/DC converter, starts the switch-OFF circuit, and discharges
the voltage from the switch gate to GND. The switch-OFF circuit is powered from the SW
at 5V.
IN
and consumes 0.4
μ
A
Since the N-ch MOS back gate is connected to GND, switch-OFF reverse current is prevented irrespective of
the High level state between SW
IN
and SW
OUT
.
The load discharge circuit installed between SW
load-side capacitor at switch OFF. When it is not necessary to discharge the load, connect the DCG pin to GND.
OUT
and GND is powered by the DCG pin, and discharges the
The DLY pins are for connection to an external capacitor to delay the switch-ON/OFF time. The surge current
at the load side is cut at power-on by controlling the switch-ON time. The switch-ON time depends on the boot
time of the DC/DC converter. Consequently, when the VIN level is high and the SW
time is small; when the SW
IN
level is high, the switch-OFF time is small.
IN
level is low, the switch-ON
Power supply
V
IN
C
D
SW
IN
SW
OUT
GND
Extemal capacitor
DLY
DDG
(+)
Comp
DC/DC converter
Load
Load discharge
circuit
Switch-OFF
circuit
Switch-ON
circuit
Switch control
Note: The MB3802 incorporates two switch blocks as shown above. However, GND is common to both blocks.
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