S8550 datasheet(6/31 Pages) SII

6 / 31 page

STEP-DOWN, BUILT-IN FET, SYNCHRONOUS RECTIFICATION, PWM CONTROL SWITCHING REGULATORS

S-8550 Series

Rev.5.0_01



Electrical Characteristics

Table 4 Electrical Characteristics

(Unless otherwise specified: VIN

= 3.6 V, VOUT = 1.8 V (the conditions in Table 5), Ta = +25°C)

Item

Symbol

Condition

Min.

Typ.

Max.

Unit

Test

Circuit

Operating input voltage VIN

−

2.0

−

5.5

Output voltage range*1

VOUT

VIN = VOUT(S) + 0.4 V to 5.5 V

1.1

−

4.0

FB voltage

VFB

VIN = VOUT(S) + 0.4 V to 5.5 V

0.588

0.6

0.612

FB voltage temperature

coefficient

ΔVFB

ΔTa

Ta =

−40°C to +85°C

−

±100

−

ppm/

°C

FB pin input current

IFB

VIN = 2.0 V to 5.5 V, FB pin

−0.1

−

+0.1

μA

Current consumption

during shutdown

ISSS

VIN = 2.0 V to 5.5 V,

VON/OFF

= 0 V

−

1.0

μA

Current consumption 1 ISS1

fosc = 1.2 MHz, no external parts,

VFB = VFB(S)

× 1.1 V

−

200

400

μA

Power MOS FET

on-resistance

RPFET

ICONT = 100 mA

−

0.4

0.6

RNFET

ICONT =

−100 mA

−

0.3

0.5

Power MOS FET

leakage current

ILSW

VIN = 2.0 V to 5.5 V,

VON/OFF

= 0 V, VCONT = 0 or 3.6 V

−

±0.01

±0.5

μA

Limit current

ILIM

−

800

1000

1200

Oscillation frequency

fosc

−

1.02

1.2

1.38

MHz

Soft-start time

tSS

Time required to reach 90% of

VOUT(S)

0.7

1.0

1.3

High level input voltage VSH

VIN = 2.0 V to 5.5 V, ON/OFF pin

0.9

−

Low level input voltage VSL

VIN = 2.0 V to 5.5 V, ON/OFF pin

−

0.3

High level input current ISH

VIN = 2.0 V to 5.5 V, ON/OFF pin

−0.1

−

0.1

μA

Low level input current

ISL

VIN = 2.0 V to 5.5 V, ON/OFF pin

−0.1

−

0.1

μA

UVLO detection voltage

VUVLO

−

1.4

1.6

1.78

*1. VOUT(S) is the output voltage set value, and VOUT is the typ. value of the actual output voltage.

VOUT(S) can be set depending on the ratio between the VFB value and output voltage set resistors (RFB1, RFB2).

For details, refer to “ External Parts Selection”



External Parts When Measuring Electrical Characteristics

Table 5 External Parts

Element Name

Symbol Constant

Manufacturer

Part Number

Inductor

3.3

μH

Taiyo Yuden Co., Ltd.

NR4018T3R3M

Input capacitor

CIN

4.7

μF

TDK Corporation

C3216X7R1E475K

Output capacitor

COUT

μF

TDK Corporation

C3216X7R1C106K

Output voltage set resistor 1

RFB1

36 k

Rohm Co., Ltd.

MCR03 Series 3602

Output voltage set resistor 2

RFB2

18 k

Rohm Co., Ltd.

MCR03 Series 1802

Phase compensation capacitor CFB

68 pF

Murata Manufacturing Co., Ltd.

GRM1882C1H680J

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