SCI7638MLA データシートの表示（PDF） - Seiko Epson Corp

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SCI7638MLA

POWER SUPPLY IC - DC/DC Switching Regulators

Seiko Epson Corp 

SCI7630 Series

Notes

s 100µH ≤ L ≤ 1mH, C ≤ 10µF, D = Schottky diode

s SCI7631MAA

• Peff = 70% when L = 220µH (leadless inductor),

VI1 = 1.5V, fCLK = 32kHz, IO = 4mA

• Peff = 75% when L = 220µH (drum coil),

VI1 = 1.5V, fCLK = 32kHz, IO = 6mA

• Peff = 80% when L = 300µH (toroidal coil),

VI1 = 1.5V, fCLK = 32kHz, IO = 7mA

s SCI7631MBA

• Peff = 70% when L = 220µH (leadless inductor),

VI1 = 1.5V, fCLK = 32kHz, IO = 8mA

• Peff = 75% when L = 220µH (drum coil),

VI1 =1.5V, fCLK = 32kHz, IO = 9mA

• Peff = 80% when L = 300µH (toroidal coil),

VI1 = 1.5V, fCLK = 32kHz, IO = 10mA

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.

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.

Diode

Use a Schottky barrier diode with a high switching

speed and low forward voltage drop, VF.

Capacitor

To minimize ripple voltages, use a capacitor with a

small equivalent direct-current resistance for smooth-

ing.

4–16

EPSON

SCI7000 Series

Technical Manual

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