LT1910 Linear Technology, LT1910 Datasheet - Page 11

• Manufacturer Part Number: LT1910
• Description: Protected High Side MOSFET Driver
• Manufacturer: Linear Technology

APPLICATIO S I FOR ATIO
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
providing normal operation of the LT1910 protection
circuitry.
PACKAGE DESCRIPTIO
.030 .005
U
(0.203 – 0.254)
.008 – .010
TYP
NOTE:
1. DIMENSIONS IN
2. DRAWING NOT TO SCALE
3. THESE DIMENSIONS DO NOT INCLUDE MOLD FLASH OR PROTRUSIONS.
.245
MIN
RECOMMENDED SOLDER PAD LAYOUT
MOLD FLASH OR PROTRUSIONS SHALL NOT EXCEED .006" (0.15mm)
U
(0.254 – 0.508)
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 represen-
tation that the interconnection of its circuits as described herein will not infringe on existing patent rights.
.010 – .020
.050 BSC
(0.406 – 1.270)
W
(MILLIMETERS)
.016 – .050
U
INCHES
8-Lead Plastic Small Outline (Narrow .150 Inch)
45
(Reference LTC DWG # 05-08-1610)
.045 .005
.160 .005
U
0 – 8 TYP
S8 Package
S
,
(5.791 – 6.197)
.228 – .244
(1.346 – 1.752)
If the load cannot be returned to supply through R
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 amplifier (must common mode to ground) is
used to level shift the voltage across R
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.
(0.355 – 0.483)
.053 – .069
.014 – .019
TYP
8
1
(4.801 – 5.004)
.189 – .197
2
7
NOTE 3
6
3
5
4
(1.270)
.050
BSC
(3.810 – 3.988)
(0.101 – 0.254)
.150 – .157
.004 – .010
NOTE 3
SO8 0303
S
up to the drain
LT1910
sn1910 1910fs
S
11
, or the