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Analog Devices Inc. LTC1255CS8#PBF
- Part No.:
- LTC1255CS8#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Gate Drivers
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
LTC1255CS8#PBF.pdf
- Description:
- IC GATE DRVR HIGH-SIDE 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:13,533
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Product details
Overview
LTC1255CS8#PBF from Analog Devices (formerly Linear Technology) is a dual high-side N-channel MOSFET driver IC designed for industrial and automotive 24V switching applications. It integrates an internal charge pump to generate gate drive voltage up to 12V above VS, delivers 100mV precision overcurrent sensing with adjustable delay, operates from 9V–24V supply, and draws only 12µA standby current. It enables robust solenoid and DC motor control without external charge pump components.
For engineers reviewing the LTC1255CS8#PBF datasheet, LTC1255CS8#PBF pinout, LTC1255CS8#PBF application, or LTC1255CS8#PBF equivalent, this page provides verified technical context, real-world timing and protection parameters, SOIC-8 package mapping, functional alternatives for high-side switching designs, and supply-chain support details specific to the LTC1255CS8#PBF variant.
Technical Context
The LTC1255CS8#PBF implements two independent high-side drivers, each featuring TTL/CMOS-compatible inputs with ~1.3V threshold and 100mV hysteresis, adaptive charge pump circuitry generating gate voltage up to 12V above VS, and dedicated drain-sense comparators referenced to a stable 100mV internal threshold. Each channel includes latch-based shutdown and fast gate discharge (<30µs short-circuit turn-off time).
Its protection architecture uses Kelvin-connected VS pin for accurate current sense reference, supports RC-delayed overcurrent response (adjustable from µs to seconds), and incorporates built-in 10µs blanking to suppress false triggering during in-rush transients. The device maintains operation under 40V/10ms supply transients and requires no external charge pump capacitors.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage Range | 9V to 24V - Enables direct use with 12V/24V automotive and industrial rails without level-shifting or regulation. |
| Standby Supply Current | 12µA typical - Allows battery-backed or low-power systems to maintain active high-side control indefinitely. |
| Gate Drive Voltage Above VS | 7.5V to 12V (typ.) - Ensures full enhancement of standard N-channel MOSFETs (e.g., IRLR024, IRFZ24) at all supply voltages. |
| Drain Sense Threshold | 100mV ±20mV - Sets precise overcurrent trip point; used with 0.036Ω sense resistor for 2.78A nominal shutdown threshold. |
| Turn-On Time (VS=24V) | 50–500µs - Configurable via external gate clamp (12V Zener) and load capacitance; balances EMI vs. switching speed. |
| Short-Circuit Turn-Off Time | 5–30µs - Fast internal discharge path protects MOSFET during fault conditions before thermal damage occurs. |
| Input Logic Compatibility | TTL and CMOS - Interfaces directly with microcontrollers, FPGAs, and logic families without buffer stages. |
Pinout & Package
Package: 8-lead SOIC (S8), RoHS-compliant, surface-mount, 150°C/W junction-to-ambient thermal resistance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| IN1 / IN2 | Active-high logic input | CMOS/TTL-compatible control signal per channel; latches ON/OFF state; must be cycled low→high after power-up. |
| G1 / G2 | Gate drive output | Drives MOSFET gate above VS (up to +12V); high-impedance when active; requires external 12V Zener clamp across MOSFET G-S. |
| DS1 / DS2 | Drain sense input | Compares voltage drop across external sense resistor to 100mV reference; triggers latch reset on overcurrent. |
| VS | Power supply and Kelvin sense reference | Provides power and serves as precise reference for drain sense comparator; must never be forced below ground. |
| GND | Analog/digital ground | Common return for logic, regulation, and protection circuits; series 100Ω resistor recommended if negative transients expected. |
Key Features
| Feature | Design Value |
|---|---|
| Dual independent high-side drivers | Enables compact H-bridge or dual-load control in single SOIC-8 package without external isolation or level shifters. |
| Integrated adaptive charge pump | Eliminates need for external flying capacitors or diodes-reduces BOM count and layout area while ensuring reliable gate boost. |
| Programmable overcurrent response delay | RC network between DSx and sense resistor allows tailored trip timing (µs to seconds) to avoid false trips on lamp/motor in-rush. |
| 100mV precision current sense threshold | Enables accurate, temperature-stable overload detection using low-value, low-power sense resistors (e.g., 0.036Ω @ 2.78A). |
| 40V transient survival rating | Withstands automotive load-dump events (≤10ms) without latch-up or damage-no external TVS required for basic protection. |
| 12µA quiescent current | Supports always-on monitoring in battery-powered modules (e.g., body control units) without compromising runtime. |
Applications
| Solenoid Driver | DC Motor Direction Control |
|---|---|
|
Use Scenario: Driving 24V automotive solenoids (e.g., fuel injectors, transmission valves) requiring fast, protected switching. IC Role / Device Role / Timing Role: High-side switch controller with integrated overcurrent shutdown and controlled gate slew rate to limit EMI. Use Value: Eliminates discrete P-channel or isolated driver solutions; 100mV sense threshold enables accurate trip at 2.78A with 0.036Ω resistor. |
Use Scenario: Bidirectional 12V–24V brushed DC motor control in automotive HVAC or seat actuation systems. IC Role / Device Role / Timing Role: Dual high-side driver enabling half-H-bridge topology with external low-side switches; supports electronic braking via coordinated channel sequencing. Use Value: Built-in short-circuit turn-off (<30µs) prevents MOSFET failure during stall; 12µA standby enables "sleep mode" operation. |
| Stepper Motor Winding Driver | Lamp Dimmer with In-Rush Protection |
|
Use Scenario: Driving unipolar stepper motor phases in industrial automation where space and reliability are critical. IC Role / Device Role / Timing Role: Independent per-phase high-side switch with programmable overcurrent delay to tolerate winding in-rush without false shutdown. Use Value: RC-adjustable DSx delay avoids nuisance tripping on phase energization; SOIC-8 footprint simplifies multi-axis board layout. |
Use Scenario: 24V halogen or LED lamp dimming in commercial lighting with soft-start and short-circuit protection. IC Role / Device Role / Timing Role: High-side PWM switch with delayed overcurrent response (via RDELAY/CDELAY) to accommodate 10× in-rush current. Use Value: Delay network shifts trip threshold temporarily-e.g., 30A for startup, then drops to 2.7A-preserving lamp life and MOSFET safety. |
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 |
|---|---|---|---|
| TPS2812D | Single-channel, 30V max supply, no integrated charge pump (requires external bootstrap); 100ns propagation delay vs. LTC1255's µs-scale timing. | Lacks dual-channel integration and programmable overcurrent delay; suited for high-frequency synchronous rectification, not slow industrial loads. | Select TPS2812D only when higher-speed switching (>100kHz) and external bootstrap design are acceptable. |
| LM5069MMX-2 | Hot-swap controller with current limiting and voltage monitoring; no gate drive capability-requires external MOSFET driver stage. | Designed for board-level power sequencing and inrush limiting, not direct high-side switching; lacks gate voltage boosting. | Choose LM5069MMX-2 when system-level fault logging, programmable UV/OV thresholds, or precise current foldback are required over direct drive. |
Compared with TPS2812D and LM5069MMX-2, the LTC1255CS8#PBF uniquely combines dual high-side drive, self-contained charge pumping, and configurable overcurrent protection in one SOIC-8 package-making it optimal for cost-sensitive, low-frequency industrial and automotive switching where simplicity and reliability are prioritized over speed or digital configurability.
Availability
LTC1255CS8#PBF is available at Aetrix Electronics and suitable for solenoid drivers, DC motor controllers, and lamp dimmers requiring stable component supply across automotive, industrial automation, and embedded power management programs.
Supply support for LTC1255CS8#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 acquired Linear Technology in 2017 and maintains its legacy precision analog and power IC portfolio. Linear pioneered high-performance, application-focused power management solutions for demanding environments.
The LTC1255CS8#PBF belongs to Linear's high-side driver family engineered specifically for rugged 9V–24V industrial and automotive systems requiring integrated protection, ultra-low quiescent current, and simplified N-channel MOSFET implementation.
FAQ
What is the maximum supply voltage the LTC1255CS8#PBF can withstand during transients?
The LTC1255CS8#PBF is rated for transient supply voltages up to 40V for durations less than 10ms, making it suitable for automotive load-dump conditions. This rating is specified in the Absolute Maximum Ratings table and validated across temperature. The device resumes normal operation after the transient passes without latch-up or parametric shift. Always verify external clamping (e.g., TVS diode) meets system-level ISO 7637-2 requirements alongside the LTC1255CS8#PBF's inherent 40V tolerance.
Does the LTC1255CS8#PBF require external components for gate drive voltage boosting?
No, the LTC1255CS8#PBF integrates a fully adaptive charge pump with on-chip capacitors, eliminating the need for external flying capacitors or diodes. It generates gate drive voltage up to 12V above VS (e.g., 36V total at VS = 24V) to fully enhance N-channel MOSFETs. However, a 12V Zener diode (e.g., MMBZ5242A) must be placed across the MOSFET gate-source terminals to clamp VGS and prevent overstress-this is an external protection component, not a charge pump element.
How does the drain sense circuitry of the LTC1255CS8#PBF respond to in-rush current in lamp or motor loads?
The LTC1255CS8#PBF drain sense circuit includes a built-in ~10µs blanking period to suppress false triggering from brief transients. For high in-rush loads like lamps (10–20× rated current), an external RC network between DSx and the sense resistor adds programmable delay-shifting the effective trip threshold upward during startup. As shown in Figure 4 of the datasheet, this allows safe lamp ignition while maintaining 2.7A protection post-startup. The LTC1255CS8#PBF's architecture supports delay constants from microseconds to seconds without modification.
What is the thermal performance of the LTC1255CS8#PBF in SOIC-8 package?
The LTC1255CS8#PBF in SOIC-8 (S8) package has a junction-to-ambient thermal resistance (θJA) of 150°C/W under standard JEDEC PCB conditions (2s2p). Its maximum junction temperature is 100°C. At 24V supply and full load, typical power dissipation is <150mW per channel, resulting in <22.5°C rise above ambient-well within safe operating limits. No heatsink is required for continuous operation at ≤24V/2.5A with adequate copper pour.
Can the LTC1255CS8#PBF be used with P-channel MOSFETs?
The LTC1255CS8#PBF is optimized for N-channel high-side switching and does not support direct P-channel drive. Its gate drive architecture sources current above VS to turn on N-MOSFETs; driving a P-channel would require sinking current below ground-a configuration incompatible with the LTC1255CS8#PBF's output stage and protection logic. For P-channel applications, discrete level-shifted gate drivers or dedicated P-channel controllers (e.g., MIC4423) are recommended instead of the LTC1255CS8#PBF.
LTC1255CS8#PBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- 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:
- 9V ~ 24V
- 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:
- Surface Mount
- Supplier Device Package:
- 8-SO
LTC1255CS8#PBF FAQ
1.How can I place an order for LTC1255CS8#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC1255CS8#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 LTC1255CS8#PBF reliable?
The price and inventory of LTC1255CS8#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC1255CS8#PBF is usually 5 days.
3.What payment methods are accepted for LTC1255CS8#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC1255CS8#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC1255CS8#PBF?
LTC1255CS8#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC1255CS8#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 LTC1255CS8#PBF?
For technical support, including LTC1255CS8#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC1255CS8#PBF requirements.
6.How does Aetrix verify that LTC1255CS8#PBF is sourced from the original manufacturer or authorized distributors?
All LTC1255CS8#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 LTC1255CS8#PBF meets industry standards.
7.What is the process for return or replacement of LTC1255CS8#PBF?
All LTC1255CS8#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC1255CS8#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 LTC1255CS8#PBF part is unused and in its original packaging.
Return procedure for LTC1255CS8#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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