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Home > Products > Integrated Circuits (ICs) > Power Management (PMIC) > Gate Drivers

Analog Devices Inc. LT1161CSW#TRPBF

Name: LT1161CSW#TRPBF
Brand: Analog Devices Inc.
SKU: LT1161CSW#TRPBF
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: LT1161CSW#TRPBF

Manufacturer:: Analog Devices Inc.

Category:: Gate Drivers

Package:: 20-SOIC (0.295", 7.50mm Width)

Datasheet:: LT1161CSW#TRPBF.pdf

Description:: IC GATE DRVR HIGH-SIDE 20SOIC

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Product details

Overview

LT1161CSW#TRPBF from Analog Devices (formerly Linear Technology) is a quad protected high-side N-channel MOSFET driver IC designed for industrial, avionics, and automotive power switching. It features four independent channels, each with integrated charge pump (750 kHz), individual short-circuit protection, programmable current limit (50–80 mV threshold), automatic restart timers, and flowthrough pinout. It operates from 8V to 48V supply and withstands –15V to 60V transients - ideal for solenoid control and electronic circuit breaker applications.

For engineers reviewing the LT1161CSW#TRPBF datasheet, LT1161CSW#TRPBF pinout, LT1161CSW#TRPBF application, or LT1161CSW#TRPBF equivalent, key selection considerations include its self-contained gate drive (12 V above V+), drain-sense comparator architecture (65 mV nominal threshold), timer capacitor–based fault recovery timing, and dual ground/supply pin configuration for Kelvin current sensing.

Technical Context

The LT1161CSW#TRPBF implements four fully independent high-side switch channels, each integrating a 750 kHz charge pump to generate gate voltage up to 14 V above V+ (at V+ = 48 V), enabling full enhancement of standard N-channel MOSFETs without external components. Each channel includes a supply-referenced drain sense comparator with 65 mV nominal threshold and +0.33%/°C temperature coefficient, matched to copper PCB shunt TC.

Operation requires both V+ pins (11, 20) and both GND pins (1, 10) to be externally tied together to support Kelvin sensing and thermal stability. The input logic is TTL/CMOS-compatible with ~200 mV hysteresis and internal 75 kΩ pull-down; the timer pin uses a 14 µA current source and 3 V threshold to control auto-restart duration via external CT (0.1 µF to 3.3 µF).

Key Specifications

Parameter	Value and Actual Design Meaning
Supply Range	8 V to 48 V operating; survives –15 V to 60 V transients - enables robust operation in unregulated industrial/automotive rails.
Gate Drive Voltage	V_GATE – V₊ = 4.5 V (min) at V₊ = 8 V; up to 14 V (max) at V₊ = 48 V - ensures full N-MOSFET enhancement across full supply range.
Drain Sense Threshold	50–80 mV (typ 65 mV) with +0.33%/°C TC - matches copper trace shunts for stable current limiting over temperature.
Turn-On/Off Time	t_ON = 100–400 µs; t_OFF = 75–200 µs (C_GATE = 1000 pF, V₊ = 24 V) - supports medium-speed switching in motor/solenoid control.
Input Threshold	V_INH = 2 V (min), V_INL = 0.8 V (max), ~200 mV hysteresis - compatible with 3.3 V/5 V logic and tolerant of noisy environments.
Timer Charge Current	I_T = 9–20 µA (nom 14 µA) - sets precise auto-restart period (e.g., 50 ms with C_T = 0.33 µF) independent of supply voltage.
Operating Temp	–40°C to +85°C (I-grade) - qualified for avionics and under-hood automotive use.

Pinout & Package

LT1161CSW#TRPBF is housed in a 20-lead plastic SOIC (SW package), wide-body (0.300-inch), RoHS-compliant and lead-free. Pin layout follows flowthrough input-to-output arrangement for minimal PCB routing complexity and noise immunity.

Pin/Terminal	Circuit Role	Design Meaning
GND (1, 10)	Power Ground Reference	Internally connected; must be externally tied together to enable Kelvin sensing and reduce ground bounce during fault events.
V+ (11, 20)	Positive Supply / Kelvin Sense Reference	Internally connected; must tie to positive side of all drain sense resistors - defines comparator reference for accurate current sensing.
IN1–IN4 (3, 5, 7, 9)	Active-High Channel Enable Inputs	TTL/CMOS-compatible with 75 kΩ internal pull-down; open-input defaults to OFF state - simplifies fail-safe startup.
T1–T4 (2, 4, 6, 8)	Auto-Restart Timer Control Nodes	Driven low during overcurrent; recharged by 14 µA current source to 3 V threshold - determines off-time before retry.
DS1–DS4 (13, 15, 17, 19)	Drain Sense Comparator Inputs	Compare MOSFET drain voltage against internal 65 mV offset - detect overcurrent by sensing voltage drop across external shunt.
G1–G4 (12, 14, 16, 18)	High-Side Gate Drive Outputs	Charge-pumped outputs capable of sourcing >10 mA peak; high-impedance when floating - drive N-MOSFET gates directly without external drivers.

Key Features

Feature	Design Value
Quad Independent High-Side Channels	Four fully isolated switch paths with dedicated charge pumps, sense comparators, and timers - enables mixed-load control (e.g., solenoids + motors) on single IC.
Voltage-Limited Gate Drive	Self-regulated gate voltage (12 V above V+) prevents MOSFET V_GS overstress - eliminates need for external zener clamps in high-side configuration.
Programmable Fault Recovery	External timing capacitor (C_T) sets auto-restart interval (10 ms to >1 s) - allows tuning for load inrush vs. fault persistence requirements.
Supply-Referenced Current Sensing	65 mV comparator threshold referenced to V+ pins - enables accurate current limiting using low-cost PCB copper traces as shunts.
Transient-Robust Architecture	Rated for –15 V to 60 V supply excursions - survives load dump, cold crank, and ESD events common in automotive/industrial systems.

Applications

Industrial Circuit Breaker	Automotive Solenoid Control
Use Scenario: Replaces electromechanical breakers in PLC I/O modules and distributed control cabinets requiring fast, repeatable trip response and remote reset capability. IC Role / Device Role / Timing Role: High-side driver with integrated current sensing and auto-restart - acts as intelligent power switch with built-in protection logic and fault timing. Use Value: Eliminates external current sense amps, timers, and gate drivers; reduces BOM count by ≥7 components per channel while maintaining trip accuracy within ±20% over –40°C to +85°C.	Use Scenario: Controls 12 V/24 V fuel injectors, transmission solenoids, and HVAC actuators in engine control units where load dump transients exceed 40 V. IC Role / Device Role / Timing Role: Protected high-side switch with transient-hardened supply pins and Kelvin-connected sense path - ensures reliable actuation despite battery rail instability. Use Value: Withstands ISO 7637-2 Pulse 5a (75 V/100 ms) without latch-up or damage; enables direct connection to vehicle battery without external TVS or regulators.
Avionics Power Distribution	Stepper Motor Phase Driver
Use Scenario: Manages non-critical loads (lighting, sensors, displays) in airborne systems requiring DO-160 Section 22 Level A surge immunity and fault logging. IC Role / Device Role / Timing Role: Quad-channel power switch with timer-pin fault feedback - provides discrete channel status indication for health monitoring and redundancy management. Use Value: Timer pin voltage drops below 3 V only during overcurrent - allows simple microcontroller GPIO monitoring for real-time fault detection without ADC overhead.	Use Scenario: Drives individual phases of bipolar stepper motors in CNC equipment and medical pumps where phase current must be limited to prevent winding saturation. IC Role / Device Role / Timing Role: High-side current-limited gate driver with programmable trip delay - regulates phase current during acceleration/deceleration ramps. Use Value: RC network between DS pin and shunt adds adjustable delay (up to 10× I_{SET) - prevents false tripping during inductive back-EMF spikes while preserving fast shutdown on hard shorts.}

Industrial Circuit Breaker

Automotive Solenoid Control

Use Scenario: Replaces electromechanical breakers in PLC I/O modules and distributed control cabinets requiring fast, repeatable trip response and remote reset capability.

IC Role / Device Role / Timing Role: High-side driver with integrated current sensing and auto-restart - acts as intelligent power switch with built-in protection logic and fault timing.

Use Value: Eliminates external current sense amps, timers, and gate drivers; reduces BOM count by ≥7 components per channel while maintaining trip accuracy within ±20% over –40°C to +85°C.

Use Scenario: Controls 12 V/24 V fuel injectors, transmission solenoids, and HVAC actuators in engine control units where load dump transients exceed 40 V.

IC Role / Device Role / Timing Role: Protected high-side switch with transient-hardened supply pins and Kelvin-connected sense path - ensures reliable actuation despite battery rail instability.

Use Value: Withstands ISO 7637-2 Pulse 5a (75 V/100 ms) without latch-up or damage; enables direct connection to vehicle battery without external TVS or regulators.

Avionics Power Distribution

Stepper Motor Phase Driver

Use Scenario: Manages non-critical loads (lighting, sensors, displays) in airborne systems requiring DO-160 Section 22 Level A surge immunity and fault logging.

IC Role / Device Role / Timing Role: Quad-channel power switch with timer-pin fault feedback - provides discrete channel status indication for health monitoring and redundancy management.

Use Value: Timer pin voltage drops below 3 V only during overcurrent - allows simple microcontroller GPIO monitoring for real-time fault detection without ADC overhead.

Use Scenario: Drives individual phases of bipolar stepper motors in CNC equipment and medical pumps where phase current must be limited to prevent winding saturation.

IC Role / Device Role / Timing Role: High-side current-limited gate driver with programmable trip delay - regulates phase current during acceleration/deceleration ramps.

Use Value: RC network between DS pin and shunt adds adjustable delay (up to 10× I_{SET) - prevents false tripping during inductive back-EMF spikes while preserving fast shutdown on hard shorts.}

Equivalent & Alternatives

The following parts are listed as comparable options for similar high-side MOSFET driver applications.

Alternative Part	Technical Difference	Application Difference	Selection Advice
LT1910CS8#TRPBF	Single-channel, integrated fault flag output, lower supply range (8–40 V), no programmable restart timer - uses internal fixed 250 ms timeout.	Suited for space-constrained designs needing only one protected switch with diagnostic output; lacks quad integration and CT-based timing flexibility.	Select LT1910CS8#TRPBF when board area is critical and fault reporting (not recovery tuning) is primary requirement.
TPS27081AQPWPRQ1	Quad-channel automotive-grade smart high-side switch (AEC-Q100), integrated diagnostics (open-load, overtemp), but no external current sense - fixed 1.7 A current limit.	Designed for ASIL-B systems with built-in diagnostics; lacks programmable current threshold and external shunt support - not suitable for precision current limiting.	Select TPS27081AQPWPRQ1 when functional safety compliance (ISO 26262) and embedded diagnostics outweigh need for adjustable trip level or PCB shunt integration.

Compared with LT1161CSW#TRPBF, LT1910CS8#TRPBF trades channel count and timing programmability for smaller footprint and integrated fault flag, while TPS27081AQPWPRQ1 replaces external sense flexibility with automotive-qualified diagnostics and fixed current limiting - making LT1161CSW#TRPBF uniquely suited for applications demanding tunable, shunt-based overcurrent protection across four independent loads.

Availability

LT1161CSW#TRPBF is available at Aetrix Electronics and suitable for industrial control, avionics power distribution, and automotive solenoid switching requiring stable component supply, long-term lifecycle support, and guaranteed RoHS/lead-free compliance.

Supply support for LT1161CSW#TRPBF includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.

Manufacturer

Analog Devices, Inc. (acquired Linear Technology in 2017) is a global leader in high-performance analog, mixed-signal, and power management semiconductors, serving industrial, automotive, communications, and aerospace markets.

The LT1161CSW#TRPBF belongs to Linear's legacy protected high-side driver product line, engineered specifically for harsh-environment power switching where supply transients, thermal stress, and reliability under fault conditions are critical design constraints.

FAQ

What is the absolute maximum supply voltage rating for the LT1161CSW#TRPBF?

The LT1161CSW#TRPBF is rated for –15 V to +60 V on its V+ pins (11 and 20) - this is an absolute maximum stress rating, not an operating condition. Operation above 48 V is not recommended for sustained use. Exceeding 60 V, even momentarily, risks catastrophic failure. Local decoupling and transient suppression at the V+ pins are essential in automotive or industrial environments where load dump or inductive kick can cause overshoot.

How does the LT1161CSW#TRPBF implement current limiting and fault recovery?

The LT1161CSW#TRPBF uses a supply-referenced comparator on each DS pin with a nominal 65 mV threshold to detect overcurrent via external shunt voltage. When exceeded, it pulls the corresponding timer pin low, forcing gate-off. A 14 µA current source then recharges the external CT capacitor to 3 V, initiating automatic restart. This cycle repeats until the fault clears - enabling self-recovery without microcontroller intervention.

Can the LT1161CSW#TRPBF drive logic-level MOSFETs at low supply voltages?

Yes - the LT1161CSW#TRPBF supports operation down to 8 V supply. At V+ = 8 V, its charge pump delivers ≥4.5 V above V+, sufficient to fully enhance logic-level N-channel MOSFETs (e.g., IRF7470, Si2300). Standard MOSFETs requiring >10 V V_GS should be avoided below 12 V supply unless verified for R_DS(on) at reduced gate drive.

What is the purpose of the dual V+ and dual GND pins on the LT1161CSW#TRPBF?

The dual V+ (pins 11, 20) and dual GND (pins 1, 10) pins on the LT1161CSW#TRPBF provide Kelvin connections for the drain sense comparators. They must be externally tied together and connected directly to the positive side of the shunt resistors - ensuring accurate current measurement by eliminating PCB trace resistance errors in the sense path.

Is the LT1161CSW#TRPBF pin-compatible with other variants in the LT1161 family?

Yes - the LT1161CSW#TRPBF shares identical pinout and footprint with LT1161CN, LT1161IN, and LT1161ISW. Differences are limited to temperature grade (C-grade: 0°C to 70°C; I-grade: –40°C to 85°C) and package (N = PDIP; SW = SOIC). All variants use the same 20-lead layout, flowthrough pin mapping, and electrical specifications except for temp-rated parameters like supply current and threshold drift.

LT1161CSW#TRPBF Specifications

Product attributes: Attribute value

Manufacturer:: Analog Devices Inc.

Series:: -

Package/Case:: 20-SOIC (0.295", 7.50mm Width)

Packaging:: Tape & Reel (TR)

Product Status:: Active

Programmable:: Not Verified

Driven Configuration:: High-Side

Channel Type:: Independent

Number of Drivers:: 4

Gate Type:: N-Channel MOSFET

Voltage - Supply:: 8V ~ 48V

Logic Voltage - VIL, VIH:: 0.8V, 2V

Current - Peak Output (Source, Sink):: -

Input Type:: Non-Inverting

High Side Voltage - Max (Bootstrap):: -

Rise / Fall Time (Typ):: -

Operating Temperature:: 0°C ~ 125°C (TJ)

Grade:: -

Qualification:: -

Mounting Type:: Surface Mount

Supplier Device Package:: 20-SO

LT1161CSW#TRPBF FAQ

1.How can I place an order for LT1161CSW#TRPBF through Aetrix?

Please submit a Request for Quotation (RFQ) for LT1161CSW#TRPBF on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.

2.Are the price and stock information for LT1161CSW#TRPBF reliable?

The price and inventory of LT1161CSW#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT1161CSW#TRPBF is usually 5 days.

3.What payment methods are accepted for LT1161CSW#TRPBF?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT1161CSW#TRPBF transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for LT1161CSW#TRPBF?

LT1161CSW#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your LT1161CSW#TRPBF order is processed, you will receive an email with the shipment details and tracking number.

Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.

5.How can I obtain technical support or documentation for LT1161CSW#TRPBF?

For technical support, including LT1161CSW#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT1161CSW#TRPBF requirements.

6.How does Aetrix verify that LT1161CSW#TRPBF is sourced from the original manufacturer or authorized distributors?

All LT1161CSW#TRPBF products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that LT1161CSW#TRPBF meets industry standards.

7.What is the process for return or replacement of LT1161CSW#TRPBF?

All LT1161CSW#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LT1161CSW#TRPBF, returns or replacements are accepted under the following conditions:

1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.

2.The issue is reported within 90 days of delivery.

3.The LT1161CSW#TRPBF part is unused and in its original packaging.

Return procedure for LT1161CSW#TRPBF:

1.Submit a request within 90 days.

2.Obtain a Return Material Authorization (RMA) from Aetrix.

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