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Analog Devices Inc. LTC1155IN8#PBF
- Part No.:
- LTC1155IN8#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Gate Drivers
- Package:
- 8-DIP (0.300", 7.62mm)
- Datasheet:
-
LTC1155IN8#PBF.pdf
- Description:
- IC GATE DRVR HIGH-SIDE 8DIP
- Quantity:
- Payment:
- Shipping:
Inventory:4,711
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Product details
Overview
LTC1155IN8#PBF from Analog Devices is a dual high-side N-channel MOSFET gate driver with integrated charge pump, enabling efficient high-side switching in battery-powered systems. It operates from 4.5V to 18V, delivers 8µA standby current and 85µA operating current per channel, and provides short-circuit protection via drain-sense threshold detection at 100mV. It is used in laptop power bus switching and SCSI termination.
For engineers reviewing the LTC1155IN8#PBF datasheet, LTC1155IN8#PBF pinout, LTC1155IN8#PBF application, or LTC1155IN8#PBF equivalent, key selection criteria include micropower operation, internal charge pump (no external components), dual independent channels, wide supply range, and programmable short-circuit response via RC delay on DSx pins.
Technical Context
The LTC1155IN8#PBF integrates two independent high-side drivers, each with TTL/CMOS-compatible inputs, adaptive charge pump circuitry generating gate voltage up to VS + 18V (at VS = 12V), and analog comparator-based overcurrent sensing referenced to an internal 100mV threshold. Its logic input has ~1.3V threshold with 100mV hysteresis and ±1.0µA input current.
Each channel features controlled turn-on (50–200µs) and turn-off (10–60µs) times into 1000pF load, plus fast short-circuit shutdown (<30µs). The device uses Kelvin-connected VS for accurate sense reference and includes low-standby-current regulator architecture that powers only active blocks during operation.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage Range | 4.5V to 18V - supports single-cell Li-ion up to 12V automotive rails without level-shifting. |
| Standby Current (per channel) | 8µA - enables multi-week battery life in sleep-mode portable systems. |
| Operating Current (per channel) | 85µA at VS = 5V - maintains ultra-low power during active high-side drive. |
| Drain Sense Threshold | 100mV - sets precise current-limit point using external sense resistor (e.g., 0.02Ω → 5A trip). |
| Gate Drive Voltage Above VS | Up to VS + 18V at VS = 12V - fully enhances low-RDS(ON) N-channel MOSFETs like IRLR034. |
| Turn-On Time (VS = 5V) | 50–200µs to VS + 2V - balances EMI control and switching speed for capacitive loads. |
| Short-Circuit Turn-Off Time | 5–30µs - protects MOSFETs during fault by rapidly discharging gate below 1V. |
Pinout & Package
Package: 8-Lead PDIP (N8), through-hole, 0.300-inch width, RoHS-compliant lead-free finish (PBF).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| IN1 / IN2 | CMOS/TTL Input | Active-high logic control for respective channel; 1.3V threshold with hysteresis; must be grounded when unused. |
| G1 / G2 | Gate Drive Output | High-impedance output driving MOSFET gate above VS via internal charge pump; capable of sourcing >10mA peak. |
| DS1 / DS2 | Drain Sense Input | Compares voltage drop across external sense resistor to 100mV reference; shorting to VS disables protection. |
| VS | Power Supply Input | Kelvin connection point for sense reference; must connect directly to supply source near sense resistors. |
| GND | Ground Reference | Analog/digital common return; requires low-impedance path to minimize noise coupling into sense circuitry. |
Key Features
| Feature | Design Value |
|---|---|
| Dual independent high-side drivers | Enables simultaneous or staggered control of two N-MOSFETs without cross-talk or shared timing constraints. |
| Integrated charge pump (no external caps) | Eliminates need for flying capacitors or bootstrap diodes - reduces BOM count and layout area. |
| Programmable short-circuit response | RC network on DSx pin allows adjustable delay (µs to seconds) to avoid false trips on inrush currents. |
| Low-voltage logic compatibility | Accepts 3.3V/5V TTL or CMOS inputs directly - no level shifters required for microcontroller interfacing. |
| Internal 100mV precision reference | Provides stable, temperature-compensated current-limit threshold independent of supply variation. |
Applications
| Laptop Power Bus Switching | SCSI Termination Power Control |
|---|---|
Use Scenario: Selectively enable/disable power to peripheral buses (e.g., USB, card reader) during system suspend/resume cycles. IC Role / Device Role / Timing Role: Dual high-side switch controlling 5V/3.3V distribution with micropower sleep mode and fast fault shutdown. Use Value: Extends battery runtime via 8µA total standby current and prevents damage from hot-plug short circuits. | Use Scenario: Dynamically power SCSI termination resistors only when bus is active, reducing system power draw. IC Role / Device Role / Timing Role: High-side driver delivering clean ON/OFF control to termination network with precise current limiting. Use Value: Eliminates need for P-channel FETs; achieves <100mV dropout and 5A capability with low RDS(ON) N-FETs. |
| Cellular Phone Power Management | Relay/Solenoid Driver Interface |
Use Scenario: Managing power to RF modules, cameras, or audio amplifiers in smartphones with tight thermal budgets. IC Role / Device Role / Timing Role: Micropower dual switch providing isolated, protected power domains under baseband processor control. Use Value: 85µA per-channel ON current minimizes quiescent loss; short-circuit latch prevents latch-up during antenna detune events. | Use Scenario: Driving 12V automotive relays or 24V industrial solenoids from low-voltage logic outputs. IC Role / Device Role / Timing Role: High-side interface translating 3.3V/5V logic signals into robust gate drive for inductive loads. Use Value: Integrated fast turn-off (<30µs) clamps inductive kickback energy before MOSFET failure occurs. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual high-side gate driver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTC1153CS8#PBF | Single-channel auto-reset electronic circuit breaker; no gate drive output - only provides fault-latched ON/OFF control. | Suitable for simple overcurrent protection only; lacks independent gate drive for custom MOSFET selection. | Select when only trip-and-hold functionality is needed, not active gate control. |
| TPS2HB35-Q1 | Automotive-grade dual high-side switch with integrated diagnostics, 3.5A continuous rating, and SPI interface. | Requires external MCU communication; higher quiescent current (25µA vs 8µA); AEC-Q100 qualified. | Select for automotive systems requiring diagnostic reporting and functional safety compliance. |
Compared with LTC1155IN8#PBF, LTC1153CS8#PBF offers simpler protection but no gate drive flexibility, while TPS2HB35-Q1 adds diagnostics and automotive qualification at the cost of higher power and interface complexity.
Availability
LTC1155IN8#PBF is available at Aetrix Electronics and suitable for laptop power bus switching, SCSI termination control, and cellular phone power management requiring stable component supply across industrial temperature ranges.
Supply support for LTC1155IN8#PBF 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 is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, serving industrial, communications, and automotive markets.
The LTC1155IN8#PBF belongs to Analog Devices' legacy power management IC family designed for micropower, high-side N-MOSFET control in portable and battery-critical systems.
FAQ
What is the operating temperature range for the LTC1155IN8#PBF?
The LTC1155IN8#PBF is rated for –40°C to +85°C operation, matching the "I" grade specification. This extended range supports deployment in automotive cabin electronics, industrial controllers, and outdoor portable equipment where ambient temperatures exceed commercial limits. The device's internal thermal shutdown and stable 100mV sense reference maintain accuracy across this full range.
Can the LTC1155IN8#PBF drive logic-level MOSFETs directly?
Yes, the LTC1155IN8#PBF can directly drive logic-level N-channel MOSFETs such as the IRLR034. Its internal charge pump generates gate voltages up to VS + 18V (e.g., 17V gate drive at VS = –1V), ensuring full enhancement even for MOSFETs with VGS(th) as high as 2.5V. The gate output sustains >10mA peak current, sufficient for typical Qg values below 20nC.
How does the drain sense protection work on the LTC1155IN8#PBF?
The LTC1155IN8#PBF compares the voltage at DS1/DS2 to VS using an internal 100mV reference. If the drop across the external sense resistor exceeds 100mV, the corresponding channel latches OFF and discharges the gate within 5–30µs. An external RC network between the sense resistor and DSx pin adds programmable delay to prevent false triggering on inrush currents.
Is the LTC1155IN8#PBF pin-compatible with other packages in the LTC1155 family?
Yes, the LTC1155IN8#PBF (8-lead PDIP) shares identical pinout and electrical behavior with the SO-8 variants (e.g., LTC1155IS8#PBF) and obsolete CERDIP versions. All use the same top-view pin assignment: DS1, G1, GND, IN1, DS2, G2, VS, IN2. This allows direct PCB footprint substitution between N8 and S8 packages without redesign.
Does the LTC1155IN8#PBF require external components for basic operation?
No, the LTC1155IN8#PBF requires no external components for core high-side gate driving: its charge pump is fully integrated, and logic inputs are CMOS/TTL compatible. Only optional components are needed - a sense resistor for overcurrent protection, and optionally an RC network on DSx for inrush delay. Decoupling capacitor (≥10µF) on VS is strongly recommended for stability.
LTC1155IN8#PBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 8-DIP (0.300", 7.62mm)
- Packaging:
- Tube
- Product Status:
- Active
- Programmable:
- Not Verified
- Driven Configuration:
- High-Side
- Channel Type:
- Independent
- Number of Drivers:
- 2
- Gate Type:
- N-Channel MOSFET
- Voltage - Supply:
- 4.5V ~ 18V
- 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:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- 8-PDIP
LTC1155IN8#PBF FAQ
1.How can I place an order for LTC1155IN8#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC1155IN8#PBF 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 LTC1155IN8#PBF reliable?
The price and inventory of LTC1155IN8#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC1155IN8#PBF is usually 5 days.
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LTC1155IN8#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC1155IN8#PBF 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 LTC1155IN8#PBF?
For technical support, including LTC1155IN8#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC1155IN8#PBF requirements.
6.How does Aetrix verify that LTC1155IN8#PBF is sourced from the original manufacturer or authorized distributors?
All LTC1155IN8#PBF 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 LTC1155IN8#PBF meets industry standards.
7.What is the process for return or replacement of LTC1155IN8#PBF?
All LTC1155IN8#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC1155IN8#PBF, 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 LTC1155IN8#PBF part is unused and in its original packaging.
Return procedure for LTC1155IN8#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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