LNBH25S datasheet(29/37 Pages) STMICROELECTRONICS

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LNBH25S

Electrical characteristics

DocID026736 Rev 2

29/37

Symbol

Parameter

Test conditions

Min.

Typ.

Max.

Unit

EffDC/DC

DC-DC converter

efficiency

IOUT = 500 mA

FSW

DC-DC converter

switching frequency

440

kHz

UVLO

Undervoltage lockout

thresholds

UVLO threshold rising

4.8

UVLO threshold falling

4.7

VLP

Low power diagnostic

(LPD) thresholds

VLP threshold rising

7.2

VLP threshold falling

6.7

VIL

DSQIN, pin logic low

0.8

VIH

DSQIN, pin logic high

IIH

DSQIN, pin input

current

VIH = 5 V

µA

FDETIN

Tone detector

frequency capture

range

(3)

0.4 VPP sine wave

kHz

VDETIN

Tone detector input

amplitude

(3)

Sine wave signal, 22 kHz

0.3

1.5

VPP

ZDETIN

Tone detector input

impedance

150

kΩ

VOL_BPSW

BPSW pin low voltage

IOL_BPSW = 5 mA, DSQIN =

high, EXTM=0, TEN=1

0.7

VOL

DSQOUT, FLT pins

logic LOW

DETIN tone present, IOL= 2

0.3

0.5

IOZ

DSQOUT, FLT pins

leakage current

DETIN tone absent, VOH = 6 V

µA

IOBK

Output backward

current

All VSELx=0, VOBK = 30 V

-3

-6

ISINK

Output low-side sink

current

VOUT forced at VOUT_NOM + 0.1

ISINK_

TIME-OUT

Low-side sink current

time-out

VOUT forced at VOUT_NOM + 0.1

PDO I²C bit is set to 1 after

this time is elapsed

IREV

Max. reverse current

VOUT forced at VOUT_NOM + 0.1

V after PDO bit is set to 1

(ISINK_TIME-OUT elapsed)

TSHDN

Thermal shutdown

threshold

150

°C

DTSHDN

Thermal shutdown

hysteresis

°C

Notes:

(1)

In applications where (VCC -VOUT) > 1.3 V the increased power dissipation inside the integrated LDO must be taken into

account in the application thermal management design.

(2)

Guaranteed by design.

(3)

Frequency range in which the DETIN function is guaranteed. The VPP level is intended on the LNB bus (before the C6

capacitor. See typical application circuit for DiSEqC 2.x). IOUT from 0 to 750 mA, CBUS from 0 to 750 nF.

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