S1F76300 Series

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Powering up

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Ensure that VO is at least the minimum operating volt-

 

 

 

 

 

 

 

 

 

 

 

 

 

 

age (0.9V) before switching on the booster circuit. One

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

VI2

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

way to do this is to connect a capacitor between PS and

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

GND so that the chip connects VO to VI when the power

Battery

 

 

 

 

 

 

 

 

 

 

 

 

 

is applied for the first time.

 

 

 

 

 

 

PS

 

 

 

 

 

 

 

C

S1F76330M

TYPICAL APPLICATIONS

Example Circuits

The output current, IO, and power conversion efficiency Peff, of a particular device in the series depends on fac-

S1F76330 series

LD

VSW

VIVO

S1F76330M

GND

C1

Crystal

CG CD

PS CLO

tors such as the switching frequency, type of coil, and the size and type of other external components.

Notes

■100μH ≤ L ≤ 1mH, C ≤ 10μF, D: Schottky diode

■S1F76330M1B0

•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

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.

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 induce noise.

Toroidal coil

Use a toroidal coil to virtually eliminate magnetic field leakage, reduce losses and improve performance.

4–28

EPSON

S1F70000 Series Technical Manual