S1F78100Y2A Epson Electronics America, Inc., S1F78100Y2A Datasheet - Page 173

• Manufacturer Part Number: S1F78100Y2A
• Description: High Precision Voltage Regulators
• Manufacturer: Epson Electronics America, Inc.

S1F76300 Series
Powering up
Ensure that V
age (0.9V) before switching on the booster circuit. One
way to do this is to connect a capacitor between PS and
GND so that the chip connects V
is applied for the first time.
TYPICAL APPLICATIONS
Example Circuits
The output current, I
Peff, of a particular device in the series depends on fac-
S1F76330 series
Notes
External Components
The performance characteristics of switching regulators
depend greatly on the choice of external components.
Observing the following guidelines will ensure high
performance and maximum efficiency.
4–28
100 H L
S1F76330M1B0
• Peff = 70% when L = 220 H (leadless inductor),
• Peff = 75% when L = 220 H (drum coil),
• Peff = 80% when L = 300 H (toroidal coil),
V
V
V
I1
I1
I1
= 1.5V,
= 1.5V,
= 1.5V,
O
GND
is at least the minimum operating volt-
V
1mH, C
f
f
f
I
CLK
CLK
CLK
L
PS CL
S1F76330M
O
, and power conversion efficiency
= 32kHz, I
= 32kHz, I
= 32kHz, I
O
V
10 F, D: Schottky diode
SW
C
G
C
rystal
O
O
O
O
V
to V
D
O
= 8mA
= 9mA
= 10mA
C
I
D
when the power
C1
EPSON
tors such as the switching frequency, type of coil, and
the size and type of other external components.
Inductor
Use an inductor with low direct-current resistance and
low losses.
Leadless
Pre-wound, leadless inductors using surface-mount
technology are the most suitable for portable equipment
and other space-critical applications.
Drum coll
Avoid drum coils because their magnetic field can in-
duce noise.
Toroidal coil
Use a toroidal coil to virtually eliminate magnetic field
leakage, reduce losses and improve performance.
Battery
C
PS
S1F76330M
V
I2
Technical Manual
S1F70000 Series