LT1910IS8

LT1910IS8

Part Number: LT1910IS8

Manufacturer: Analog Devices

Description: Gate Drivers LT1910 – Protected High Side MOSFET Driver

Shipped from: Shenzhen/HK Warehouse

Stock Available: Check with us

Technical Specifications of LT1910IS8#PBF

Datasheet  LT1910IS8#PBF datasheet
Category Integrated Circuits (ICs)
Family PMIC – Gate Drivers
Manufacturer Linear Technology
Series
Packaging Tube
Part Status Active
Driven Configuration High-Side
Channel Type Single
Number of Drivers 1
Gate Type N-Channel MOSFET
Voltage – Supply 8 V ~ 48 V
Logic Voltage – VIL, VIH 0.7V, 3.5V
Current – Peak Output (Source, Sink)
Input Type Non-Inverting
High Side Voltage – Max (Bootstrap)
Rise / Fall Time (Typ)
Operating Temperature -40°C ~ 125°C (TJ)
Mounting Type Surface Mount
Package / Case 8-SOIC (0.154″, 3.90mm Width)
Supplier Device Package 8-SOIC

LT1910IS8 Description

High-side switching applications can now use low-cost N-channel power MOSFETs thanks to the LT®1910, a high-side gate driver. It has a built-in charge pump that can boost the performance of an N-channel MOSFET switch without needing additional parts. The switch is disabled, and a fault flag is raised when the on-board drain comparator detects that the switch current has exceeded the threshold. When an external timing capacitor has run its course, the switch will remain off for a long time before attempting to resume.

If the fault persists, this process will keep cycling until the MOSFET is safe again. When the switch is successfully restarted, the fault flag is deactivated. The LT1910 was developed for applications where inadequate supply control and/, or transients are prevalent, such as those seen in industrial, avionics, and automotive settings. Input voltage spikes from 15V to 60V won’t harm the gadget. Package options for the LT1910 include a SO-8 option.

LT1910IS8 Features

  • The Voltage Can Be 8V to 48V.
  • Safeguarded against Power Surge Interruptions of up to 60V.
  • Defends Against a Short Circuit.
  • Preset Timer for Instant Restart.
  • Warning Signal for Open Collector.
  • The N-channel MOSFET switches are improved in every way.
  • Limit, delay, and auto-start time can all be set by the user.
  • Drive for Gates with Reduced Voltage.
  • Assumes an “Off” setting when an “Open” input is present.
  • It consists of a SO-8 boxed version for purchase.

LT1910IS8 Applications

  • Industrial Control
  • Avionics Systems
  • Automotive Switches
  • Stepper Motor and DC Motor Control
  • Electronic Circuit Breaker

Pin Functions

● (Pin 1) GND

Common Ground.

● (Pin 2) TIMER

When an overcurrent condition is detected, the restart time is determined by a timing capacitor, CT, connected from the TIMER pin to the ground. CT is immediately drained to less than 1V when an overcurrent condition is detected and then recharged by a 14A nominal current source to the 2.9V timer threshold before a restart is attempted. To disable the external switch, the GATE pin must be pulled low whenever TIMER falls below 2.9V. This process is repeated until the switch no longer experiences an overcurrent condition and can restart normally. Under normal conditions, the pin clamps at a nominal 3.5V.

● (Pin 3) FAULT

The TIMER pin voltage is monitored by the FAULT pin, which flashes red when too much current flows through it. When a current limit condition is detected, and the TIMER pin drops below 3.3V, the FAULT pin goes active LOW. When the TIMER pin rises above 3.4V in auto-restart, the FAULT pin is immediately reset to HIGH. The FAULT pin is a logical interface open-collector output and must be used with an external pull-up resistor. The resistor should be chosen so that the low-status pull-up current is no more than 1 mA.

● (Pin 4) IN

About 200mV of hysteresis can be found at the IN-pin, making it TTL/CMOS compatible. An internal charge pump is started to pull the GATE pin-up when the IN pin is pulled active HIGH above 2V. No matter the supply status, the IN pin can be pulled up to 15V. To keep the GATE pin inactive at LOW if the IN pin is left open, a 75k pull-down resistor is installed internally.

● (Pin 5) GATE

The GATE pin can drive a power MOSFET gate. Any time the IN pin is higher than 2V, the GATE pin is pumped to a level roughly 12V above the supply. When pumped higher than the rail, its impedance increases to a few hundred k. Any loading caused by parasitic resistance to ground or supply should be kept to a minimum. When the TIMER pin goes below 2.9V, the GATE pin pulls LOW.

● (Pin 6) SENSE

The SENSE input pin is wired to a 65mV nominally offset supply-referenced comparator. As soon as 65mV is subtracted from the supply voltage on the SENSE pin, the MOSFET gate is driven LOW, discharging the timing capacitor. The drain-sense resistor is made from a copper trace on the PCB, and its temperature coefficient (TC) is nearly identical to the SENSE pin threshold’s TC (0.33%/°C).

An RC timing delay can be introduced between the drain-sense resistor and the SENSE pin for loads needing a high inrush current to prevent a false trigger from the current-sense comparator at start-up. There should be no more than 10k between a drain-sense resistor and the SENSE pin. The SENSE pin is connected to power if current sensing is unnecessary.

● (Pin 8) V+

The current-sense comparator’s Kelvin connection is located on the V+ pin, which also supplies operating current to the LT1910. To ensure proper operation of the current sensing pin, the V+ pin must be connected to the positive side of the drain-sense resistor.

Operation

The LT1910 GATE pin can be either disabled or enabled. In the off position, it is kept LOW; in the on position, a built-in 750kHz charge pump raises it to 12V above the supply. The off state is triggered when either the IN or TIMER pin falls below 0.8V. In contrast, when the IN pin is above 2V, and the TIMER pin is over 2.9V, the device enters the state. Hysteresis at the IN pin is around 200mV.

A 75k resistor connected to the IN pin keeps it low if the connection is not made. A 14A pull-up current source maintains the TIMER pin at a diode drop above 2.9V in typical operation. If the IN pin is higher than 2V, the TIMER pin will reset the GATE pin to the on position. The SENSE pin is often connected to the power MOSFET’s drain, which then returns to supply through a drain-sense resistor of low value. The drain-sense resistor’s positive terminal (V+) must be connected directly to the sense comparator’s V+ pin for reliable MOSFET drain current sensing.

When the GATE pin is grounded, and the MOSFET drain current is high enough to produce a drop of 65mV across the drain-sense resistor, the MOSFET will conduct. The sense comparator turns on a pull-down NPN, swiftly lowering the TIMER pin to less than 2.9V. This safeguards the power MOSFET by causing the timing comparator to ignore the IN pin and turn the GATE pin off. The FAULT pin is pulled LOW, signaling an overcurrent situation when the TIMER pin is lowered below 3.3V, activating the fault comparator and the open-collector NPN.

The TIMER pin is unlocked when the gate voltage of the MOSFET drops below 1.4V. After the charge pump drives the GATE pin HIGH, the timing capacitor is charged to 2.9V by the 14A current source. If the fault situation persists, the sense comparator’s threshold will be broken, and the timer cycle will begin again. If the TIMER pin successfully charges above 3.4V, the FAULT pin goes HIGH and becomes inactive.

Conclusion

You are in the right place if you are looking for more information about LT1910IS8 or want to place an order. Give us a call at ICRFQ, the leading electronic components distributor in China, and we will ensure that you get the best possible products at prices that are within your budget.

4.8/5 - (397 votes)
Kevin Chen