S-882150AMH-M2ZTFG datasheet(8/19 Pages) SII

Part #	S-882150AMH-M2ZTFG

Description	VOLTAGE REGULATION STEP-UP CHARGE PUMP DC-DC CONVERTER

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Manufacturer	SII [Seiko Instruments Inc]

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VOLTAGE REGULATION STEP-UP CHARGE PUMP DC-DC CONVERTER

S-8821 Series

Rev.3.1_00

Seiko Instruments Inc.

8

Operation

1. Basic operation

Figure 6 shows the block diagram of the S-8821 Series.

The S-8821 series controls the output voltage by using the pulse frequency modulation (PFM) method.

The SW1 to SW4 switching transistors are switched ON/OFF with the clock generated by the internal

oscillator circuit, and operates the step-up charge pump.

The output voltage is fed back and the voltage split by feedback resistances Rs and Rf and reference

voltage (Vref) are compared by a comparator. This comparator signal is used to modulate the oscillation

pulse frequency in order to keep the output voltage constant.

VIN

Switch

control

circuit

SW1

SW2

SW3

SW4

C

+

C

−

CPUMP=0.10 μF

Soft start

circuit

ON/OFF

circuit

ON/OFF

PFM control

oscillator

circuit

(1.0 MHz)

Reference

voltage

+

-

VOUT

GND

COUT=10 μF

Rs

Rf

CIN=4.7 μF

Figure 6

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S-882150AMH-M2ZTFG Datasheet(PDF) 8 Page - Seiko Instruments Inc

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