S-19680AAAH-K8T2U Datasheet, PDF (14/27 Pages) Seiko Instruments Inc – Current consumption during operation

FOR AUTOMOTIVE 105°C OPERATION CURRENT MONITOR HIGH SIDE SWITCH
S-19680 Series
Rev.1.1_00
3. ON / OFF pin
This pin starts and stops the switch operation and the current monitor operation. When the ON / OFF pin i_{_}s_{__}s_{__}et to
OFF, the_{__}i_{_}n_{__}ternal circuit stops operating and the Pch output transistor and the Nch output transistor (the SC pin
and the O L pin) are turned off, reducing current consumption significantly.
The internal equivalent circuit related to the ON / OFF pin is configured as shown in Figure 14, the ON / OFF pin
is neither pulled down nor pulled up. For this reason, do not use it in the floating status. When not using the ON /
OFF pin, connect it to the VDD pin. The current consumption increases when a voltage of 0.6 V to V_DD − 0.3 V is
applied to the ON / OFF pin, so caution should be exercised.
Table 10
Product ON / OFF Internal
Type
Pin
Circuit
OUT Pin
Voltage
_____
SC
Pin Voltage^*3
_____
OL
Pin Voltage^*3
Current
Consumption
A/B
"H": ON
Operate
Power Supply
Voltage^*1
"H": Load normal status
"L": Load short-circuit status
"H": Load normal status
"L": Load open status
I_SS1
"L": OFF Stop
V_SS^*2
"H"
"H"
I_SS2
*1. Power supply voltage is output by turning the Pch output transistor on.
A voltage drop occurs by flowing I_SHUNT in R_SHUNT and the Pch output transistor with ON resistance (R_ON).
*2. The OUT pin is neither pulled up nor pulled down internally. The OUT pin voltage changes to V_SS level by the load
connected to the OUT pin. _{_____}
_____
*3. Since the output form of the SC pin or the O L pin is Nch open-drain output, it changes to "H" by an external
pull-up resistor.
VDD
ON / OFF
VSS
Figure 14
4. Low power supply voltage detection circuit
The S-19680 Series has a built-in low power supply voltage detection circuit. When power supply voltage drops
lower than the d_{__}e_{__}t_{_}ection voltage,_{__}t_{_}h_{__}e internal circuit stops operating and the Pch output transistor and Nch output
transistor (the SC pin and the O L pin) are turned off. In the latch type thermal shutdown circuit, the detection
status latch is released.
When power supply voltage rises higher than the release voltage, the internal circuit starts operating. The
detection voltage is 2.15 V typ. and the release voltage is 2.2 V typ.
Even if the power supply voltage is higher than the r_{_}e_{__}l_{_}e_{_}ase voltage im_{__}m_{___}ediately after power supply startup, the
Pch output transistor and Nch output transistor (the SC pin and the O L pin) are turned off until the internal IC
operates stably.
Power supply voltage
Detection voltage
2.15 V typ.
Release voltage
2.2 V typ.
Internal circuit stops operating
Pch output transistor and Nch transistor turn off
Figure 15
14