S-8821 Datasheet, PDF (2/19 Pages) Seiko Instruments Inc – VOLTAGE REGULATION STEP-UP CHARGE PUMP DC-DC CONVERTER

VOLTAGE REGULATION STEP-UP CHARGE PUMP DC-DC CONVERTER
S-8821 Series
„ Block Diagram
Rev.3.1_00
VIN
C_IN=4.7 μF
SW1
C+
C_PUMP=0.10 μF
C−
SW2
SW3
SW4
Switch
control
circuit
Soft start
circuit
PFM control
oscillator
circuit
(1.0 MHz)
R_s
+
R_f
-
ON/OFF
circuit
Reference
voltage
VOUT
C_OUT=10 μF
ON/OFF
Figure 1
GND
2
Seiko Instruments Inc.