S-8352 Seiko Instruments, S-8352 Datasheet - Page 22

• Manufacturer Part Number: S-8352
• Description: (S-8351 / S-8352) SMALL PACKAGE PFM CONTROL STEP-UP SWITCHING REGULATOR
• Manufacturer: Seiko Instruments

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STEP-UP, SUPER-SMALL PACKAGE, PFM CONTROL SWITCHING REGULATOR / SWITCHING REGULATOR CONTROLLER
S-8351/8352 Series
5. V
The D type provides separate internal circuit power supply (VDD pin) and output voltage setting pin (VOUT pin) in the
IC, making it ideal for the following applications.
Cautions 1. This IC starts a step-up operation at V
DD
/ V
(1) Changing the output voltage value using an external resistor
(2) Setting a high output voltage value, such as +15 V
OUT
Separate Type (For S-8351/8352 Series D Type)
2. Choose external resistors R
3. Attach a capacitor (C
voltage and frequency of the oscillator. (Input a voltage of 1.8 V or more at the VDD pin for all
products with a setting less than 1.9 V.) An input voltage of 1.8 V or more at the VDD pin allows
connection of the VDD pin to either the input voltage VIN pin or output VOUT pin.
is impedance between the VOUT pin and VSS pin in the IC chip. The internal resistance between
the VOUT pin and VSS pin is as follows :
(1) S-835xx18 : 2.1 to 14.8 M Ω
(2) S-835xx20 : 1.4 to 14.8 M Ω
(3) S-835xx30 : 1.4 to 14.2 M Ω
(4) S-835xx50 : 1.4 to 12.1 M Ω
oscillation of the output voltage occurs. Calculate C
C
C
[ ]
F
=
2
•
π
•
R
A
1
•
20
C
) in parallel to the R
kHz
Seiko Instruments Inc.
A
and R
B
so as to not affect the output voltage, considering that there
DD
= 0.8 V, but set 1.8 ≤ V
A
resistance when an unstable event such as
C
using the following equation :
DD
≤ 10 V to stabilize the output
Rev.2.0
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