LTC6103 datasheet(24/28 Pages) AD

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LT6119-1/LT6119-2

611912f

For more information www.linear.com/LT6119-1

applicaTions inForMaTion

Reverse-Supply Protection

The LT6119 is not protected internally from external rever-

sal of supply polarity. To prevent damage that may occur

during this condition, a Schottky diode should be added

in series with V– (Figure 17). This will limit the reverse

current through the LT6119. Note that this diode will limit

the low voltage operation of the LT6119 by effectively

reducing the supply voltage to the part by VD.

Also note that the comparator reference, comparator

output and LE input are referenced to the V– pin. In

order to preserve the precision of the reference and to

avoid driving the comparator inputs below V–, R2 must

connect to the V– pin. This will shift the amplifier output

voltage up by VD. VOUTA can be accurately measured dif-

ferentially across R1 and R2. The comparator output low

voltage will also be shifted up by VD. The LE pin thresh-

old is referenced to the V– pin. In order to provide valid

input levels to the LT6119 and avoid driving LE below

V– the negative supply of the driving circuit should be

tied to V–.

V+

V–

INC

V–

–

VOUTA

–

611912 F17

OUTA 8

V+

SENSEHI

LT6119-1

RIN

RSENSE

ILOAD

VDD

SENSELO

OUTC

400mV

REFERENCE

VDD

Figure 17. Schottky Prevents Damage During Supply Reversal

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