s-8424a Seiko Instruments Inc., s-8424a Datasheet - Page 21

• Manufacturer Part Number: s-8424a
• Description: Battery Backup Switching Ic
• Manufacturer: Seiko Instruments Inc.

Rev.2.2
3.4 Switch Transistor M1
_00
Voltage regulator 2 is also used to switch from VIN pin to VOUT pin. Therefore, no reverse current flows
from VOUT pin to 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
Therefore, when M1 is switched ON and VOUT pin is connected to VBAT pin, the voltage drop (V
caused by M1 is 60 × I
minimum.
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
(output current) at maximum., and V
VIN
Seiko Instruments Inc.
Figure 9 Definition of V
REG2
VOUT
V
OUT
dif
BATTERY BACKUP SWITCHING IC
M1
BAT
= 10 to 500 μ A).
dif
– V
dif
VBAT
(max.) is output to the VOUT pin at
S-8424A Series
21
dif
IN
)