Datasheet
LT1910
11
1910fa
Information furnished by Linear Technology Corporation is believed to be accurate and reliable.
However, no responsibility is assumed for its use. Linear Technology Corporation makes no representa-
tion that the interconnection of its circuits as described herein will not infringe on existing patent rights.
PACKAGE DESCRIPTION
APPLICATIONS INFORMATION
The LT1910 gate drive is current limited for this purpose
so that no resistance is needed between the GATE pin
and Zener.
Current sensing for protecting low side drivers can be done
in several ways. In the Figure 8a circuit, the supply voltage
for the load is assumed to be within the supply operating
range of the LT1910. This allows the load to be returned
to supply through current-sense resistor, R
S
, providing
normal operation of the LT1910 protection circuitry.
If the load cannot be returned to supply through R
S
, or
the load supply voltage is higher than the LT1910 supply,
the current sense must be moved to the source of the
low side MOSFET.
Figure 8b shows an approach to source sensing. An
operational amplifi er (must common mode to ground) is
used to level shift the voltage across R
S
up to the drain-
sense pin. This approach allows the use of a small sense
resistor which could be made from PC trace material. The
LT1910 restart timer functions the same as in the high side
switch application.
S8 Package
8-Lead Plastic Small Outline (Narrow .150 Inch)
(Reference LTC DWG # 05-08-1610)
.016 – .050
(0.406 – 1.270)
.010 – .020
(0.254 – 0.508)
s
45
o
0
o
– 8
o
TYP
.008 – .010
(0.203 – 0.254)
SO8 0303
.053 – .069
(1.346 – 1.752)
.014 – .019
(0.355 – 0.483)
TYP
.004 – .010
(0.101 – 0.254)
.050
(1.270)
BSC
1
2
3
4
.150 – .157
(3.810 – 3.988)
NOTE 3
8
7
6
5
.189 – .197
(4.801 – 5.004)
NOTE 3
.228 – .244
(5.791 – 6.197)
.245
MIN
.160
p.005
RECOMMENDED SOLDER PAD LAYOUT
.045 p.005
.050 BSC
.030 p.005
TYP
INCHES
(MILLIMETERS)
NOTE:
1. DIMENSIONS IN
2. DRAWING NOT TO SCALE
3. THESE DIMENSIONS DO NOT INCLUDE MOLD FLASH OR PROTRUSIONS.
MOLD FLASH OR PROTRUSIONS SHALL NOT EXCEED .006" (0.15mm)