S-1701 datasheet(41/70 Pages) SII

41 / 70 page

HIGH RIPPLE-REJECTION LOW DROPOUT CMOS VOLTAGE REGULATOR WITH RESET FUNCTION

Rev.2.4_00

S-1701 Series

Seiko Instruments Inc.

3. Shutdown pin (ON/OFF pin) (S-1701 Series A/ B/ C/ D/ E/ F/ G/ H/ J/ K/ L/ M types)

This pin starts and stops the regulator.

When the ON/OFF pin is set to the shutdown level, the operation of all internal circuits stop, 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. At this time, the current consumption equals that consumed by the

detector block, because the internal circuits of the detector are operating. The VOUT pin becomes the

VSS level due to the internally divided resistance of several hundred k

Ω between the VOUT pin and VSS

pin.

The structure of the ON/OFF pin is as shown in Figure 35. 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 VIN

− 0.3 V is applied to the ON/OFF pin. When the ON/OFF pin is not

used, connect it as follows according to the product type.

• S-1701 Series A/ B/ C/ D/ E/ F types: Connect to the VIN pin.

• S-1701 Series G/ H/ J/ K/ L/ M types: Connect to the VSS pin.

Table 31

Product Type

ON/OFF Pin

Internal Circuits

VOUT Pin Voltage

Current

Consumption

A/ B/ C/ D/ E/ F

“H”: Power on

Operating

Set value

ISS

A/ B/ C/ D/ E/ F

“L”: Shutdown

Stopped

VSS level

ISSD

G/ H/ J/ K/ L/ M

“H”: Shutdown

Stopped

VSS level

ISSD

G/ H/ J/ K/ L/ M

“L”: Power on

Operating

Set value

ISS

VSS

ON/OFF

VIN

Figure 35

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