ST8R00 datasheet(8/19 Pages) STMICROELECTRONICS

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Electrical characteristics

ST8R00

8/19

Table 6.

Electrical characteristics for the ST8R00W (VI = 5V, VINH = 2V, IO = 100mA,

TJ = -25°C to 125°C, CI = CO = 10µF(X7R), L = 4.7µH unless otherwise specified.)

Symbol

Parameter

Test conditions

Min.

Typ.

Max.

Unit

Output voltage

(1)

612

VSTART-UP Start-up voltage

IO = 400mA, VI rising

3.5

Input voltage range

VFB

Feedback voltage

IO = 50mA

1.195

1.22

1.245

VFB_OFF Feedback voltage

IO = 0, VINH = 0

IFB

Feedback current

VFB = 0, VINH = 2V

600

ISUPPLY

Supply current

To be measured at VI, VO = 7V, no

load

RDSON_N Internal N channel RDSON

ILX = 400mA

300

RDSON_P Internal P channel RDSON

ILX = 400mA

300

ILX(leak)

Internal leakage current

VLX = 4V, VFB = 2V, VINH = 0

0.5

µA

ILX(LIM)

LX current limitation

VLX = 4V

fOSC

Oscillator frequency

To be measured on LX pin

0.8

1.2

1.4

MHz

DTY

Max. oscillator duty cycle

To be measured on LX pin

Eff

Efficiency

IO = 50mA, VO = 7V

IO = 500mA, VO = 9V

IO = 1A, VO = 9V

VINH_H

Inhibit threshold high

VINH_L

Inhibit threshold low

VI = 4 to 6V, IO = 50mA

0.8

IINH

Inhibit pin current

VINH = VI = 5V

µA

TSHDN

Thermal shut down (2)

130

150

°C

THYS

Thermal shut down hysteresis

(2)

°C

ΔVO/ΔVI Line transient response

VI from 4 to 5.5V, IO= 500mA

(2)

-5

%VO

ΔVO/ΔIO Load transient response

VI = 5V, IO from 10mA to 500mA,

VO = 7V

(2)

-5

%VO

ΔVO/ΔVI Start-up transient

VI from 0 to 5V, IO = 500mA

-10

%VO

TSTART

Start-up time

VINH from 0 to 5V, IO = 100mA

500

µs

For VO higher than 9V the maximum output current capability is reduced according to LX current limitation

Guaranteed by design

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