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Analog Devices Inc. LTC1155CN8#PBF
- Part No.:
- LTC1155CN8#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Gate Drivers
- Package:
- 8-DIP (0.300", 7.62mm)
- Datasheet:
-
LTC1155CN8#PBF.pdf
- Description:
- IC GATE DRVR HIGH-SIDE 8DIP
- Quantity:
- Payment:
- Shipping:
Inventory:4,232
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Product details
Overview
LTC1155CN8#PBF from Analog Devices is a dual high-side N-channel MOSFET gate driver IC with integrated charge pump, enabling efficient high-side switching in low-voltage 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 of 100mV. It is used in laptop power bus switching and battery-powered load control where micropower sleep mode is critical.
For engineers reviewing the LTC1155CN8#PBF datasheet, LTC1155CN8#PBF pinout, LTC1155CN8#PBF application, or LTC1155CN8#PBF equivalent, key selection criteria include its dual-channel high-side drive capability, internal charge pump eliminating external components, 100mV overcurrent sense threshold, controlled turn-on/off timing, and compatibility with TTL/CMOS logic inputs.
Technical Context
The LTC1155CN8#PBF integrates two independent high-side drivers, each featuring an adaptive charge pump that boosts gate voltage up to 9V above VS (e.g., 15V at VS = 12V), enabling full enhancement of standard N-channel MOSFETs. Its analog comparator compares drain-to-source voltage drop across an external sense resistor against a precision 100mV internal reference.
Each channel includes TTL/CMOS-compatible input with 1.3V threshold and ~100mV hysteresis, low-standby-current regulator, and fast short-circuit shutdown (<30µs). The device supports RC-delayed overcurrent response to avoid false triggering on capacitive or lamp loads while maintaining MOSFET safety under true fault conditions.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage Range | 4.5V to 18V - supports wide-input battery and industrial rails without external regulation |
| Standby Current (per channel) | 8µA - enables multi-week battery life in always-on monitoring systems |
| Operating Current (per channel) | 85µA at VS = 5V - ensures minimal system power overhead during active switching |
| Drain Sense Threshold | 100mV ±20mV - sets precise current-limit point for short-circuit protection |
| Gate Drive Voltage Above VS | Up to 9V above VS (e.g., 15V at VS = 12V) - fully enhances low-RDS(on) N-channel FETs like IRLZ34 |
| Turn-On Time | 50–250µs (VS = 5V, CGATE = 1nF) - balances EMI control and switching speed for motor and relay loads |
| Short-Circuit Turn-Off Time | 5–30µs - rapidly discharges gate to prevent MOSFET destruction during overload |
Pinout & Package
Package: 8-Lead PDIP (N8), through-hole, 0°C to 70°C operating temperature range.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| IN1 / IN2 | CMOS/TTL Input | Active-high logic control for respective channel; 1.3V threshold with hysteresis prevents noise-induced toggling |
| G1 / G2 | Gate Drive Output | High-impedance output driven above VS by internal charge pump; directly connects to MOSFET gate |
| DS1 / DS2 | Drain Sense Input | Compares voltage drop across external sense resistor to 100mV reference; resets latch on overcurrent |
| VS | Power Supply Input | Provides bias for all circuitry and Kelvin connection point for sense resistor top node |
| GND | Ground Reference | Common return for logic, analog, and charge pump circuits; must be low-impedance |
Key Features
| Feature | Design Value |
|---|---|
| Dual independent high-side drivers | Enables simultaneous control of two separate high-side loads (e.g., dual power rails or H-bridge half-legs) |
| Integrated charge pump | Eliminates need for external boost capacitors or diodes - reduces BOM count and PCB area |
| Programmable short-circuit response delay | RC network between DSx and sense resistor allows tailored startup tolerance for lamps/capacitors without compromising fault safety |
| TTL/CMOS logic compatibility | Accepts 0–5V inputs directly - no level-shifting required when interfacing with microcontrollers or logic ICs |
| Low quiescent current | 8µA total standby draw enables use in energy-harvesting or coin-cell-powered applications |
Applications
| Laptop Power Bus Switching | SCSI Termination Power Control |
|---|---|
Use Scenario: Selectively enable/disable +5V power domains in portable computing systems during sleep/wake transitions. IC Role / Device Role / Timing Role: Dual high-side switch controlling isolated power rails; uses micropower standby to preserve battery during suspend. Use Value: Replaces inefficient P-channel FETs with lower RDS(on) N-channel devices, reducing conduction loss by >50% at 2A load. | Use Scenario: Dynamically supply termination voltage to SCSI bus lines only when host controller is active. IC Role / Device Role / Timing Role: High-side load switch with fast turn-off (<30µs) to prevent bus contention during hot-plug events. Use Value: Prevents backfeeding into inactive terminators and eliminates need for discrete protection diodes. |
| Cellular Phone Power Management | Relay and Solenoid Driver |
Use Scenario: Control power to RF front-end modules and camera flash circuits in GSM/UMTS handsets. IC Role / Device Role / Timing Role: Dual-channel load switch managing multiple subsystems; leverages 8µA standby to extend standby time. Use Value: Enables software-controlled power gating without sacrificing battery life - critical for 7-day+ standby targets. | Use Scenario: Drive 12V automotive relays or industrial solenoids from low-voltage MCU GPIOs. IC Role / Device Role / Timing Role: High-side interface translating 3.3V/5V logic to 12V coil drive; includes inrush current limiting via RC delay. Use Value: Eliminates need for discrete transistor buffers and flyback diodes - simplifies layout and improves reliability. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar high-side gate driver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS2051BDR | Single-channel, 500mA current-limited load switch; no internal charge pump - requires P-channel FET | Lacks dual-channel operation and programmable overcurrent delay; suited for simpler, lower-current USB-peripheral switching | Select when only single load control is needed and P-FET solution is acceptable |
| MAX14914ATP+ | Dual high-side switch with integrated diagnostics, 60V abs max, SPI interface - higher integration but no internal charge pump | Requires external gate drivers for N-FETs; adds diagnostic reporting not present in LTC1155CN8#PBF | Select when system-level fault reporting and industrial voltage tolerance (>18V) are required |
Compared with TPS2051BDR and MAX14914ATP+, the LTC1155CN8#PBF uniquely combines dual N-FET high-side drive, micropower standby, and self-contained charge pump - making it optimal for space-constrained, battery-sensitive dual-load applications where external components must be minimized.
Availability
LTC1155CN8#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 and long-term industrial availability.
Supply support for LTC1155CN8#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 LTC1155CN8#PBF belongs to Analog Devices' legacy power management portfolio designed specifically for efficient, low-quiescent-current high-side switching in portable and battery-operated systems.
FAQ
What is the maximum supply voltage rating for the LTC1155CN8#PBF?
The absolute maximum supply voltage for the LTC1155CN8#PBF is 22V. Continuous operation is specified from 4.5V to 18V. Exceeding 22V may cause permanent damage. The LTC1155CN8#PBF includes internal protection against overvoltage transients, but sustained operation above 18V is outside its guaranteed functional range and risks reliability degradation.
Does the LTC1155CN8#PBF require external components for charge pump operation?
No, the LTC1155CN8#PBF integrates all necessary charge pump capacitors on-die. No external capacitors or diodes are required to generate gate voltage above the supply rail. This distinguishes the LTC1155CN8#PBF from most competing high-side drivers and simplifies design for compact, low-BOM applications.
How does the drain sense function work in the LTC1155CN8#PBF?
The LTC1155CN8#PBF compares the voltage at the DS1/DS2 pins to the VS pin using an internal 100mV reference. If the differential exceeds 100mV (indicating excessive current through the sense resistor), the corresponding gate driver is immediately disabled. The LTC1155CN8#PBF latches off until the input is cycled, and optional RC filtering can be added to prevent false triggers on inrush.
Can the LTC1155CN8#PBF drive logic-level MOSFETs effectively?
Yes - the LTC1155CN8#PBF generates gate voltages up to 9V above VS (e.g., 15V at VS = 6V), which fully enhances logic-level N-channel MOSFETs such as the IRLZ34 or IRLR024. Its gate drive strength and controlled slew rates ensure reliable switching without oscillation or shoot-through in typical load configurations.
What is the operating temperature range for the LTC1155CN8#PBF?
The LTC1155CN8#PBF is rated for 0°C to 70°C ambient operation, as indicated by the "C" grade suffix in its part number. This commercial-grade temperature range is validated per the Absolute Maximum Ratings table and Electrical Characteristics section of the official Analog Devices datasheet Rev. C.
LTC1155CN8#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:
- 0°C ~ 70°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- 8-PDIP
LTC1155CN8#PBF FAQ
1.How can I place an order for LTC1155CN8#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC1155CN8#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 LTC1155CN8#PBF reliable?
The price and inventory of LTC1155CN8#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC1155CN8#PBF is usually 5 days.
3.What payment methods are accepted for LTC1155CN8#PBF?
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4.How is shipping managed for LTC1155CN8#PBF?
LTC1155CN8#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC1155CN8#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 LTC1155CN8#PBF?
For technical support, including LTC1155CN8#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC1155CN8#PBF requirements.
6.How does Aetrix verify that LTC1155CN8#PBF is sourced from the original manufacturer or authorized distributors?
All LTC1155CN8#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 LTC1155CN8#PBF meets industry standards.
7.What is the process for return or replacement of LTC1155CN8#PBF?
All LTC1155CN8#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC1155CN8#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 LTC1155CN8#PBF part is unused and in its original packaging.
Return procedure for LTC1155CN8#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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