Electrical characteristics

LNBH26LS

26/33

DocID025504 Rev 1

Symbol

Parameter

Test conditions

Min.

Typ.

Max.

Unit

DC-DC converter

switching

frequency

440

kHz

UVLO

Undervoltage

lockout thresholds

UVLO threshold rising

4.8

V

UVLO threshold falling

4.7

V

Low power

diagnostic (LPD)

thresholds

7.2

V

6.7

V

DSQIN, pin logic

low

0.8

V

DSQIN, pin logic

high

2

V

DSQIN, pin input

current

15

µA

Output backward

current

-3

-6

mA

Output low-side

sink current

70

mA

OUT

Low-side sink

current time-out

10

ms

Max. reverse

current

2

mA

Thermal shutdown

threshold

150

°C

Thermal shutdown

hysteresis

15

°C

Notes:

LDO, must be taken into account in the application thermal management design.

8.1

Output voltage selection

Each LNBH26LS channel is provided with 8 output voltage levels, (4 levels for 13 V range

when VSEL4-A/B=0 and 4 levels for 18 V range when VSEL4-A/B=1) which can be

selected through the register data1. The following table shows the output voltage values

corresponding to VSELx bit combinations both for channel A and B. If all VSELx are at “0”

Table 13: Output voltage selection table (data1 register, write mode)

VSEL4-

A/B

VSEL3-

A/B

VSEL2-

A/B

VSEL1-

A/B

pin

voltage

Function

0

0

0

0

0

disabled. The

LNBH26LS set in

standby mode