S-882Z datasheet(12/24 Pages) SII

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ULTRA-LOW VOLTAGE OPERATION CHARGE PUMP IC FOR STEP-UP DC-DC CONVERTER STARTUP

S-882Z Series

Rev.1.2_00

Seiko Instruments Inc.

Example of Connection with Step-up DC-DC Converter

The following are the connection examples based on the set condition.

The symbols used in the connection diagram are described in Table 7 below.

Table 7

Symbol

Description

SD1

A Schottky diode for preventing a voltage decline in the VDD pin due to output capacitor CL at

step-up DC-DC converter startup.

CVDD

The power smoothing capacitor of the step-up DC-DC converter. Set the capacitance value so

that CVDD

≤ CCPOUT × 0.1.

SD2, ROUT

A Schottky diode and pull-down resistor to prevent the OUT pin voltage of the S-882Z Series

from exceeding the absolute maximum rated voltage.

R1, R2

Bleeder resistors to prevent the VM pin voltage of the S-882Z Series from exceeding the

absolute maximum rated voltage.

1. VOUT

≤ 3.0 V, CL ≤ CCPOUT × 0.1, no load

VIN

CIN

VIN

CCPOUT

VIN

OUT

VSS

S-882Z Series

VSS

VOUT

Step-up DC-DC converter

VDD

OUT

CPOUT

Figure 16

2. VOUT

≤ 3.0 V, CL > CCPOUT × 0.1

VIN

CIN

VIN

CCPOUT

VIN

OUT

VSS

S-882Z Series

VSS

VOUT

Step-up DC-DC converter

CVDD

VDD

OUT

CPOUT

SD1

Figure 17

S-882Z Datasheet(PDF) 12 Page - Seiko Instruments Inc

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