S8351 datasheet(12/51 Pages) SII

12 / 51 page

STEP-UP, BUILT-IN / EXTERNAL FET PFM CONTROL SWITCHING REGULATOR / SWITCHING REGULATOR CONTROLLER

S-8351/8352 Series

Rev.3.0_01

Table 15 (2 / 2)

(Ta = 25

°C unless otherwise specified)

Item

Symbol

Condition

Min.

Typ.

Max.

Unit

Measurement

circuit

OFF

pin input voltage

(With shutdown function)

VSH

VOUT = VOUT(S)

× 0.95,

Measured oscillation at CONT pin

0.75

−

VSL1

VOUT = VOUT(S)

× 0.95,

Judged oscillation stop at

CONT pin

At VOUT

≥1.5 V

−

0.3

VSL2

At VOUT

<1.5 V

−

0.2

OFF

pin input current

(With shutdown function)

ISH

OFF

= 10 V

− 0.1

−

0.1

μA

ISL

OFF

= 0 V

− 0.1

−

0.1

μA

Efficiency

EFFI

−

S-8351x30

−

S-8351x50

−

External parts

Coil:

CDRH6D28-101 (100

μH) of Sumida Corporation

Diode:

MA2Z748 (Shottky type) of Matsushita Electric Industrial Co., Ltd.

Capacitor: F93 (16 V, 47

μF tantalum type) of Nichicon Corporation

VIN = VOUT(S)

× 0.6 applied, IOUT = VOUT(S) / 250 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.)

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