ST8R00 datasheet(7/19 Pages) STMICROELECTRONICS

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ST8R00

Electrical characteristics

7/19

Electrical characteristics

Table 5.

Electrical characteristics for the ST8R00 (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)

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

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, no load

500

µA

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 = 100mA, VO = 9V

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)

Guaranteed by design

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

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