S-8821 Seiko Instruments, S-8821 Datasheet - Page 2

• Manufacturer Part Number: S-8821
• Description: VOLTAGE REGULATION STEP-UP CHARGE PUMP DC-DC CONVERTER
• Manufacturer: Seiko Instruments

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