參數(shù)資料
型號(hào)： S-T111
英文描述： Voltage Regulators
中文描述： 穩(wěn)壓器
文件頁(yè)數(shù)： 11/22頁(yè)
文件大小： 379K
代理商： S-T111
Rev.1.2
_00
HIGH RIPPLE-REJECTION LOW DROPOUT CMOS VOLTAGE REGULATOR
S-T111 Series
Seiko Instruments Inc.
11
3. Shutdown pin (ON/OFF pin)
This pin starts and stops the regulator.
When the ON/OFF pin is set to the shutdown level, the operation of all internal circuits stops, and the built-
in P-channel MOS FET output transistor between the VIN pin and VOUT pin is turned off to substantially
reduce the current consumption. The VOUT pin becomes the V
SS
level due to the internally divided
resistance of several M
between the VOUT pin and VSS pin.
The structure of the ON/OFF pin is as shown in Figure 11. Since the ON/OFF pin is neither pulled down
nor pulled up internally, do not use it in the floating state. In addition, note that the current consumption
increases if a voltage of 0.3 V to V
IN
– 0.3 V is applied to the ON/OFF pin. When the ON/OFF pin is not
used, connect it to the VSS pin if the logic type is “A” and to the VIN pin if it is “B”.
Table 5
Logic Type
ON/OFF Pin
Internal Circuits
VOUT Pin Voltage
Current Consumption
A
“L”: Power on
Operating
Set value
I
SS1
A
“H”: Power off
Stopped
V
SS
level
I
SS2
B
“L”: Power off
Stopped
V
SS
level
I
SS2
B
“H”: Power on
Operating
Set value
I
SS1
VSS
ON/OFF
VIN
Figure 11
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