S1135 datasheet(21/48 Pages) SII

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HIGH RIPPLE-REJECTION LOW DROPOUT MIDDLE OUTPUT CURRENT CMOS VOLTAGE REGULATOR

Rev.2.2_00

S-1135 Series

Seiko Instruments Inc.

3. ON / OFF pin

This pin starts and stops the regulator.

When the ON / OFF pin is set to 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 type has a built-in discharge shunt circuit to discharge the output capacitance,

the VOUT pin is forcibly set to VSS level. In the S-1135 Series C / D / G / H type, the VOUT pin is set to VSS level

through several hundred k

Ω internal divided resistors between the VOUT and VSS pins. Note that the 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 type, the

/ OFF pin is internally pulled up to the VIN pin or pulled down to the VSS pin in the floating status, so the VOUT pin is

set to the VSS level. In the S-1135 Series B / D / F / H type, the ON / OFF pin is not internally pulled up or pulled

down, so do not use the ON / OFF pin in the floating status. When not using the ON / OFF pin, connect it to the VIN

pin in the product B / D type, and connect it to the VSS pin in the F / H type.

Table 11

Product Type

ON / OFF Pin

Internal Circuit

VOUT Pin Voltage

Current Consumption

A / B / C / D

“H”: ON

Operate

Set value

ISS1

A / B / C / D

“L”: OFF

Stop

VSS level

ISS2

E / F / G / H

“H”: OFF

Stop

VSS level

ISS2

E / F / G / H

“L”: ON

Operate

Set value

ISS1

*1.

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 the VIN pin in the A / C type, the ON / OFF pin is

connected to the VSS pin in the E / G type (Refer to Figure 21).

(1) S-1135 Series A / C / E / G type

(2) S-1135 Series B / D / F / H type

VSS

VIN

ON / OFF

E / G type

A / C type

VSS

VIN

ON / OFF

Figure 21

Figure 22

S1135 Datasheet(PDF) 21 Page - Seiko Instruments Inc

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