S1F78100Y2A Epson Electronics America, Inc., S1F78100Y2A Datasheet - Page 161

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

S1F76300 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.
4–16
100 H L
S1F76310M1A0
• Peff = 70% when L = 220 H (leadless inductor),
• Peff = 75% when L = 220 H (drum coil),
• Peff = 80% when L = 300 H (toroidal coil),
S1F76310M1B0
• 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
V
V
V
I1
I1
I1
I1
I1
I1
= 1.5V,
= 1.5V,
= 1.5V,
= 1.5V,
=1.5V,
= 1.5V,
1mH, C
f
f
f
f
f
f
CLK
CLK
CLK
CLK
CLK
CLK
= 32kHz, I
= 32kHz, I
= 32kHz, I
= 32kHz, I
= 32kHz, I
= 32kHz, I
10 F, D = Schottky diode
O
O
O
O
O
O
= 9mA
= 4mA
= 6mA
= 7mA
= 8mA
= 10mA
EPSON
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 coil
Avoid using drum coils because their magnetic field
can induce noise.
Toroidal coil
Use a toroidal coil to virtually eliminate magnetic field
leakage, reduce losses and improve performance.
Diode
Use a Schottky barrier diode with a high switching
speed and low forward voltage drop, V
Capacitor
To minimize ripple voltages, use a capacitor with a
small equivalent direct-current resistance for smooth-
ing.
F
Technical Manual
S1F70000 Series
.