S8355 datasheet(21/72 Pages) SII

21 / 72 page

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

Rev.8.1_01

S-8355/56/57/58 Series

(5) 600 kHz Product (P and Q types)

Table 22

(Ta = 25

°C unless otherwise specified)

Item

Symbol

Condition

Min.

Typ.

Max.

Unit

Measurement

circuit

Output voltage

VOUT

−

VOUT(S)

× 0.976

VOUT(S) VOUT(S)

× 1.024

Input voltage

VIN

−

Operation start voltage

VST1

IOUT = 1 mA

−

0.9

Oscillation start voltage

VST2

No external parts, Voltage applied to VDD

−

0.8

Operation holding voltage

VHLD

IOUT = 1 mA, Judged by decreasing VIN

voltage gradually

0.7

−

Current consumption 1

ISS1

VDD = 3.3 V

−

132.8

221.3

μA

Current consumption 2

ISS2

VDD = 3.3 V

−

16.2

32.4

μA

Current consumption during

shutdown

(With shutdown function)

ISSS

OFF

= 0 V

−

0.5

μA

EXT pin output current

IEXTH

VDD = 3.3 V

− 10.3 − 20.7

−

IEXTL

VDD = 3.3 V

19.2

38.5

−

Line regulation

ΔVOUT1

VIN = VOUT(S)

× 0.4 to × 0.6

−

Load regulation

ΔVOUT2

IOUT = 10

μA to VOUT(S) / 50 × 1.25

−

Output voltage temperature

coefficient

OUT

•

Ta =

−40 to +85°C

−

±50

−

ppm /

°C4

Oscillation frequency

fOSC

VDD = 3.3 V

510

600

690

kHz

Maximum duty ratio

MaxDuty

VDD = 3.3 V

PWM / PFM switching duty

ratio (For S-8356/58 Series)

PFMDuty

VIN = VOUT(S)

− 0.1 V, No-load

OFF

pin input voltage

(With shutdown function)

VSH

Measured oscillation at EXT pin

0.75

−

VSL1

Judged oscillation stop at

EXT 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

= VOUT(S)

× 0.95

− 0.1

−

0.1

μA

ISL

OFF

= 0 V

− 0.1

−

0.1

μA

Soft start time

tSS

−

1.5

3.0

6.0

Efficiency

EFFI

−

External parts

Coil:

CDRH6D28-100 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,

OFF

= VOUT

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) 21 Page - Seiko Instruments Inc

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