FUJITSU SEMICONDUCTOR
DATA SHEET
DS04-27602-1E
ASSP
BIPOLAR
Power Supply
Power Management Switching IC
(with flash memory power switching function)
MB3807A
s
DESCRIPTION
When data is written to or read from flash memory, it requires that the voltage at its power supply (V
PP
) be switched
(to 12 V for writing and to 3.3 or 5.0 V for reading).
The MB3807A is a power management switching IC, designed to be compatible with the PCMCIA digital controller,
to switch the V
PP
voltage of flash memory.
When the switch is turned on, optimum voltage is applied to the gate of the internal charge pump N-ch MOS
switch, providing a constant amount of ON resistance. The ON resistance is also kept to be low to reduce voltage
drop at the V
PP
pin that is caused by large current flowing when data is written.
In addition, the OFF time is much shorter than the ON time to prevent short-circuiting between the reading and
writing power supplies when the device switches the V
PP
voltage for reading or writing data (break-before-make
operation).
s
FEATURES
• Switching at low ON resistance
For writing data: SWIN1 = 12 V, Ron = 0.3
Ω
For reading data: SWIN2 = 5 V, Ron = 6.0
Ω
SWIN2 = 3.3 V, Ron = 8.5
Ω
• Wide range of supply voltages: V
CC
= 2.7 to 5.5 V
• Prevention of reverse current from the load at switch-off time
• ON time controllable with external pin
• Break-before-make operation
s
PACKAGE
16 pin Plastic SOP
(FPT-16P-M04)
FUJITSU [ FUJITSU COMPONENT LIMITED. ]
