s-1135a13-u5t1g Seiko Instruments Inc., s-1135a13-u5t1g Datasheet - Page 21

• Manufacturer Part Number: s-1135a13-u5t1g
• Description: High Ripple-rejection Low Dropout Middle Output Current Cmos Voltage Regulator
• Manufacturer: Seiko Instruments Inc.

Rev.1.1
3. ON / OFF pin
HIGH RIPPLE-REJECTION LOW DROPOUT MIDDLE OUTPUT CURRENT CMOS VOLTAGE REGULATOR
This pin starts and stops the regulator.
When the ON / OFF pin is set to the power-off level, the entire internal circuit stops operating, and the built-in P-
channel MOS FET output transistor between the VIN and VOUT pins is turned off, reducing current consumption
significantly.
Since the S-1135 Series A / B / E / F types have a built-in discharge shunt circuit to discharge the output
capacitance, the VOUT pin is forcibly set to V
to V
current consumption increases when a voltage of 0.3 V to 1.0 V (Ta = 25°C) is applied to the ON / OFF pin.
The ON / OFF pin is configured as shown in Figures 21 and 22. In the S-1135 Series A / C / E / G types, the ON /
OFF pin is internally pulled up or pulled down to VSS when in the floating status, so the VOUT pin is set to the V
level. In the S-1135 Series B / D / F / H types, the ON / OFF pin is not internally pulled up or pulled down, so do
not use these types with the ON / OFF pin in the floating status. When the ON / OFF pin is not used in the S-1135
Series B / D / F / H types, connect the pin to the VIN pin in the B / D types, and connect it to the VSS pin in the F / H
types.
*1.
A / B / C / D
A / B / C / D
E / F / G / H
E / F / G / H
_00
Logic Type
(1) S-1135 Series A / C / E / G Type
SS
ON / OFF
Note that the IC’s current consumption increases as much as current flows into the pull-up / pull-down
resistor when; the ON / OFF pin is connected to VIN in the A / C type, the ON / OFF pin is connected to
VSS in the E / G type (Figure 21).
level through several hundred kΩ internal divided resistors between the VOUT and VSS pins. Note that the
E / G type
A / C type
“H”: Power-on
“L”: Power-off
“H”: Power-off
“L”: Power-on
ON / OFF Pin
Figure 21
VSS
VIN
Internal Circuits
Seiko Instruments Inc.
Operating
Operating
Stopped
Stopped
SS
level. In the S-1135 Series C / D / G / H types, the VOUT pin is set
Table 11
(2) S-1135 Series B / D / F / H Type
ON / OFF
VOUT Pin Voltage
Set value
Set value
V
V
SS
SS
level
level
Figure 22
VSS
VIN
Current Consumption
I
I
I
I
S-1135 Series
SS1
SS2
SS2
SS1
*1
*1
21
SS