S8355 datasheet(14/72 Pages) SII

14 / 72 page

STEP-UP, SUPER-SMALL PACKAGE, 600 kHz, PWM CONTROL or PWM/PFM SWITCHABLE SWITCHING REGULATOR CONTROLLER

S-8355/56/57/58 Series

Rev.8.1_01

Table 18 (2 / 2)

(Ta = 25

°C unless otherwise specified)

Item

Symbol

Condition

Min.

Typ.

Max.

Unit

Measurement

circuit

OFF

pin input current

(For with shutdown function)

ISH

OFF

= VOUT(S)

× 0.95

− 0.1

−

0.1

μA

ISL

OFF

= 0 V

− 0.1

−

0.1

μA

Soft start time

tSS

−

3.0

6.0

12.0

Efficiency

EFFI

−

External parts

Coil:

CDRH6D28-470 of Sumida Corporation

Diode:

RB461F (Schottky type) of Rohm Co., Ltd.

Capacitor:

F93 (16 V, 47

μF tantalum type) of Nichicon Corporation

Transistor:

CPH3210 of Sanyo Electric Co., Ltd.

Base resistor (Rb):

1.0 k

Base capacitor (Cb):

2200 pF (ceramic type)

VIN = VOUT(S)

× 0.6 applied, IOUT = VOUT(S) / 50 Ω

With shutdown function :

OFF

pin is connected to VOUT

For VDD / VOUT separate type : VDD pin is connected to VOUT pin

Remark 1.

VOUT(S) specified above is the set output voltage value, and VOUT is the typical value of the actual output voltage.

VDD / VOUT separate type

A step-up operation is performed from VDD = 0.8 V. However, 1.8 V

≤ VDD ≤ 10 V is recommended stabilizing

the output voltage and oscillation frequency. (VDD

≥ 1.8 V must be applied for products with a set value of less

than 1.9 V.)

S8355 Datasheet(PDF) 14 Page - Seiko Instruments Inc

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