s-8425 Seiko Instruments Inc., s-8425 Datasheet - Page 12

• Manufacturer Part Number: s-8425
• Description: Battery Backup Switching Ic
• Manufacturer: Seiko Instruments Inc.

12
BATTERY BACKUP SWITCHING IC
S-8425 Series
Therefore, when M1 is switched ON and the VOUT pin is connected to the VBAT pin, the voltage drop V
caused by M1 is 60 × I
minimum.
3.4 Switch Transistor M1
Voltage regulator 2 is also used to switch from the VIN
pin to the VOUT pin. Therefore, no reverse current flows
from the VOUT pin to the VIN pin when voltage regulator
2 is OFF.
The output voltage of voltage regulator 2 can be selected
from between 2.3 V and 5.4 V in 0.1 V steps.
The on-resistance of switch transistor M1 is 60 Ω or
lower (I
When voltage regulator 2 is ON and M1 is OFF, the leakage current of M1 is kept below 0.1 μ A max. (V
6 V, Ta = 25°C) with the VBAT pin grounded (VSS pin).
OUT
= 10 to 500 μ A).
OUT
(output current) at maximum, and V
Seiko Instruments Inc.
VIN
BAT
− V
Figure 9 Definition of V
dif
(max.) is output to the VOUT pin at
REG2
VOUT
V
dif
dif
Rev.2.3
M1
VBAT
_00
IN
dif
=