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PDF LT1910ES8 Data sheet ( Hoja de datos )
| Número de pieza | LT1910ES8 | |
| Descripción | Protected High Side MOSFET Driver | |
| Fabricantes | Linear Technology | |
| Logotipo |  |
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FEATURES
s 8V to 48V Power Supply Range
s Protected from –15V to 60V Supply Transients
s Short-Circuit Protected
s Automatic Restart Timer
s Open-Collector Fault Flag
s Fully Enhances N-Channel MOSFET Switches
s Programmable Current Limit, Delay Time and
Autorestart Period
s Voltage Limited Gate Drive
s Defaults to OFF State with Open Input
s Available in SO-8 Package
U
APPLICATIO S
s Industrial Control
s Avionics Systems
s Automotive Switches
s Stepper Motor and DC Motor Control
s Electronic Circuit Breaker
LT1910
Protected High Side
MOSFET Driver
DESCRIPTIO
The LT®1910 is a high side gate driver that allows the use
of low cost N-channel power MOSFETs for high side
switching applications. It contains a completely self-con-
tained charge pump to fully enhance an N-channel MOSFET
switch with no external components.
When the internal drain comparator senses that the switch
current has exceeded the preset level, the switch is turned
off and a fault flag is asserted. The switch remains off for
a period of time set by an external timing capacitor and
then automatically attempts to restart. If the fault still
exists, this cycle repeats until the fault is removed, thus
protecting the MOSFET. The fault flag becomes inactive
once the switch restarts successfully.
The LT1910 has been specifically designed for harsh
operating environments such as industrial, avionics and
automotive applications where poor supply regulation
and/or transients may be present. The device will not
sustain damage from supply transients of –15V to 60V.
The LT1910 is available in the SO-8 package.
, LTC and LT are registered trademarks of Linear Technology Corporation.
TYPICAL APPLICATIO
Fault Protected High Side Switch
5V 24V
FAULT OUTPUT
OFF ON
5.1k
3
LT1910
FAULT
V+
8
4
IN
6
SENSE
2 TIMER GATE 5
GND
1
0.1µF
+
0.01Ω
IRFZ34
10µF
50V LOAD
1910 TA01
Switch Drop vs Load Current
0.50
0.45
0.40
0.35
0.30
0.25
0.20
0.15
0.10
0.05
0
0
1 2 34
LOAD CURRENT (A)
5
1910 TA02
sn1910 1910fs
1
1 page  
LT1910
PI FU CTIO S
GND (Pin 1): Common ground.
TIMER (Pin 2): A timing capacitor CT from the TIMER pin
to ground sets the restart time following overcurrent
detection. Upon detection of an overcurrent condition, CT
is rapidly discharged to less than 1V and then recharged
by a 14µA nominal current source back to the 2.9V timer
threshold, whereupon the restart is attempted. Whenever
TIMER pulls below 2.9V, the GATE pin pulls low to turn off
the external switch. This cycle repeats until the overcur-
rent condition goes away and the switch restarts success-
fully. During normal operation the pin clamps at 3.5V
nominal.
FAULT (Pin 3): The FAULT pin monitors the TIMER pin
voltage and indicates the overcurrent condition. When-
ever the TIMER pin is pulled below 3.3V at the onset of a
current limit condition, the FAULT pin pulls active LOW.
The FAULT pin resets HIGH immediately when the TIMER
pin ramps above 3.4V during autorestart. The FAULT pin
is an open-collector output, thus requiring an external
pull-up resistor and is intended for logic interface. The
resistor should be selected with a typical 1mA pull-up at
low status and less than 2mA under worst-case condi-
tions.
IN (Pin 4): The IN pin threshold is TTL/CMOS compatible
and has approximately 200mV of hysteresis. When the IN
pin is pulled active HIGH above 2V, an internal charge
pump is activated to pull up the GATE pin. The IN pin can
be pulled as high as 15V regardless of whether the supply
is on or off. If the IN pin is left open, an internal 75k pull-
down resistor pulls the pin below 0.8V to ensure that the
GATE pin is inactive LOW.
GATE (Pin 5): The GATE pin drives the power MOSFET
gate. When the IN pin is greater than 2V, the GATE pin is
pumped approximately 12V above the supply. It has
relatively high impedance (the equivalence of a few hun-
dred kΩ) when pumped above the rail. Care should be
taken to minimize any loading by parasitic resistance to
ground or supply. The GATE pin pulls LOW when the
TIMER pin falls below 2.9V.
SENSE (Pin 6): The SENSE pin connects to the input of a
supply-referenced comparator with a 65mV nominal off-
set. When the SENSE pin is taken more than 65mV below
supply, the MOSFET gate is driven LOW and the timing
capacitor is discharged. The SENSE pin threshold has a
0.33%/°C temperature coefficient (TC), which closely
matches the TC of the drain sense resistor formed from the
copper trace of the PCB.
For loads requiring high inrush current, an RC timing delay
can be added between the drain sense resistor and the
SENSE pin to ensure that the current-sense comparator
does not false trigger during start-up (see Applications
Information). A maximum of 10kΩ can be inserted be-
tween a drain sense resistor and the SENSE pin. If current
sensing is not required, the SENSE pin is tied to supply.
V+ (Pin 8): In addition to providing the operating current
for the LT1910, the V+ pin also serves as the Kelvin
connection for the current sense comparator. The V+ pin
must be connected to the positive side of the drain sense
resistor for proper current sensing operation.
sn1910 1910fs
5
5 Page 
LT1910
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 RS,
providing normal operation of the LT1910 protection
circuitry.
If the load cannot be returned to supply through RS, 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 amplifier (must common mode to ground) is
used to level shift the voltage across RS 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.
PACKAGE DESCRIPTIO
S8 Package
8-Lead Plastic Small Outline (Narrow .150 Inch)
(Reference LTC DWG # 05-08-1610)
.050 BSC
.045 ±.005
.189 – .197
(4.801 – 5.004)
NOTE 3
8 765
.245
MIN .160 ±.005
.228 – .244
(5.791 – 6.197)
.150 – .157
(3.810 – 3.988)
NOTE 3
.030 ±.005
TYP
RECOMMENDED SOLDER PAD LAYOUT
.010
(0.254
–
–
.020
0.508)
×
45°
.008 – .010
(0.203 – 0.254)
0°– 8° TYP
1
.053 – .069
(1.346 – 1.752)
2
.016 – .050
(0.406 – 1.270)
NOTE:
1. DIMENSIONS
IN
INCHES
(MILLIMETERS)
.014 – .019
(0.355 – 0.483)
TYP
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)
34
.004 – .010
(0.101 – 0.254)
.050
(1.270)
BSC
SO8 0303
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.
sn1910 1910fs
11
11 Page | ||
| Páginas | Total 12 Páginas | |
| PDF Descargar | [ Datasheet LT1910ES8.PDF ] | |
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