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Analog Devices Inc. LTC1255CN8#PBF
- Part No.:
- LTC1255CN8#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Gate Drivers
- Package:
- 8-DIP (0.300", 7.62mm)
- Datasheet:
-
LTC1255CN8#PBF.pdf
- Description:
- IC GATE DRVR HIGH-SIDE 8DIP
- Quantity:
- Payment:
- Shipping:
Inventory:3,237
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Product details
Overview
LTC1255CN8#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 100µs typical turn-on time at 10V supply with 1nF load, features independent overcurrent sensing with 100mV threshold, and draws only 12µA standby current. It enables robust solenoid and lamp control in battery-powered systems.
For engineers reviewing the LTC1255CN8#PBF datasheet, LTC1255CN8#PBF pinout, LTC1255CN8#PBF application, or LTC1255CN8#PBF equivalent, key selection criteria include its 9V–24V operating range, dual-channel independent shutdown, 100mV drain-sense threshold accuracy, SOIC-8/DIP-8 package compatibility, and absence of external charge pump components.
Technical Context
The LTC1255CN8#PBF implements two independent high-side driver channels, each with TTL/CMOS-compatible inputs, latch-based control logic, and adaptive charge pump circuitry that self-generates gate voltage above VS without external capacitors. Its analog section includes a precision 100mV reference comparator for drain-sense overcurrent detection and built-in 10µs delay to suppress false triggering on inrush currents.
Each channel provides controlled gate rise/fall times to minimize EMI, fast short-circuit turn-off (<30µs), and gate clamp protection via integrated Zener-clamp interface logic. The device uses Kelvin-connected VS pin for accurate sense resistor referencing and supports RC-delayed overcurrent response for lamp and capacitive loads.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage Range | 9V to 24V - Enables direct operation from 12V automotive and 24V industrial rails without regulation. |
| Standby Supply Current | 12µA max - Allows always-on monitoring in battery-backed systems with negligible quiescent drain. |
| Drain Sense Threshold | 100mV ±20mV - Sets precise overcurrent trip point for 0.036Ω sense resistor (2.78A nominal trip). |
| Gate Voltage Above VS | 7.5V to 12V - Ensures full enhancement of standard N-channel MOSFETs like IRLR024 with VGS(th) ≤ 2.5V. |
| Turn-On Time (10V, 1nF) | 30–300µs - Configurable slew rate supports EMI-sensitive environments and soft-start requirements. |
| Short-Circuit Turn-Off Time | 5–30µs - Limits MOSFET energy dissipation during fault events to stay within SOA limits. |
| Input Logic Threshold | VINH = 2V, VINL = 0.8V - Compatible with 5V µP outputs and tolerant of noise margins in harsh environments. |
Pinout & Package
Package: 8-lead PDIP (N8), 0.300" wide, through-hole mount. Pin 1 marked with notch or dot; pin numbering counterclockwise from top-left corner when viewed from top.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (DS1) | Channel 1 Drain Sense Input | High-impedance comparator input referenced to VS; connects to low-side of sense resistor for overcurrent detection. |
| 2 (G1) | Channel 1 Gate Drive Output | Active-high output driving MOSFET gate above VS; clamped to +12V above rail via external Zener diode. |
| 3 (GND) | Ground Reference | Logic and analog ground return; requires 100Ω series resistor if negative transients expected. |
| 4 (IN1) | Channel 1 Input Control | CMOS/TTL-compatible active-high enable; latched internally; must be cycled low→high after power-up. |
| 5 (DS2) | Channel 2 Drain Sense Input | Independent overcurrent sense input for second channel; identical function and biasing as DS1. |
| 6 (G2) | Channel 2 Gate Drive Output | Second independent high-side gate driver; electrically isolated from G1; same clamp and drive specs. |
| 7 (VS) | Positive Supply / Kelvin Sense | Power input and Kelvin reference for drain-sense comparator; must connect directly to power rail near load. |
| 8 (IN2) | Channel 2 Input Control | Second independent logic input; fully asynchronous and latch-controlled like IN1. |
Key Features
| Feature | Design Value |
|---|---|
| Dual independent high-side drivers | Enables separate control of two loads (e.g., H-bridge half-bridges or dual solenoids) without cross-talk or shared fault propagation. |
| No external charge pump components | On-chip oscillator and flying capacitor eliminate need for external diodes/capacitors-reducing BOM count and PCB area. |
| Programmable overcurrent delay | RC network between DSx and sense resistor allows adjustable trip timing (µs to seconds) to accommodate lamp inrush or motor startup. |
| 12µA standby current | Supports always-on monitoring in automotive body electronics and remote sensors without compromising battery life. |
| Transient-tolerant design | Withstands 40V/10ms supply transients and reverse-battery conditions (with 100Ω ground-series resistor), meeting ISO 7637-2 requirements. |
Applications
| Solenoid Driver | Lamp Dimmer |
|---|---|
|
Use Scenario: Driving 24V DC solenoids in automotive door locks or HVAC actuators with in-rush current up to 5× steady-state. IC Role / Device Role / Timing Role: High-side switch controller providing gate drive, overcurrent shutdown, and controlled turn-on to limit EMI. Use Value: Eliminates need for P-channel MOSFETs or discrete charge pumps while ensuring reliable solenoid engagement under cold-cranking conditions (9V min). |
Use Scenario: PWM dimming of 12V automotive halogen lamps with 10× in-rush current suppression. IC Role / Device Role / Timing Role: Dual-channel driver enabling independent lamp control with programmable overcurrent delay to avoid false trips during filament warm-up. Use Value: Achieves flicker-free dimming with <100µs gate control resolution and thermal-safe shutdown before filament burnout. |
| DC Motor Direction Control | Relay Driver |
|
Use Scenario: Bidirectional control of 24V brushed DC motors in seat/mirror adjustment modules using discrete H-bridge topology. IC Role / Device Role / Timing Role: Two independent high-side switches paired with external low-side FETs; coordinated by µP to prevent shoot-through. Use Value: Enables stall-current detection and automatic shutdown before motor winding damage, with <30µs fault response. |
Use Scenario: Replacing electromechanical relays in industrial PLC output modules requiring >100k cycle life and silent operation. IC Role / Device Role / Timing Role: Solid-state high-side switch with integrated diagnostics (via DSx pins) and transient immunity for 24V control circuits. Use Value: Reduces relay coil power consumption by 95%, eliminates contact arcing, and supports predictive maintenance via sense-resistor monitoring. |
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, no integrated overcurrent sense; requires external current-sense amplifier and comparator. | Lacks autonomous short-circuit shutdown; needs µP intervention for fault handling. | Choose when system already implements centralized current monitoring and gate drive timing is critical (15ns propagation delay). |
| LM5050-1MMX/NOPB | Or-ing controller with 45V rating and 1.5mΩ internal FET; not a gate driver - intended for back-to-back FET configurations. | Designed for redundancy/power-path ORing, not load switching; no logic-level inputs or programmable delay. | Use only for hot-swap or redundant supply applications - not suitable as direct replacement for load-switching functions. |
Compared with TPS2812D and LM5050-1MMX/NOPB, the LTC1255CN8#PBF uniquely combines dual-channel autonomy, integrated 100mV sense, and micropower standby in a single DIP/SOIC package - making it optimal for space-constrained, safety-critical 24V industrial and automotive load switching where fault resilience is mandatory.
Availability
LTC1255CN8#PBF is available at Aetrix Electronics and suitable for solenoid drivers, lamp dimmers, and relay replacements requiring stable component supply across automotive Tier-1 production, industrial control panel builds, and medical equipment manufacturing.
Supply support for LTC1255CN8#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 high-reliability analog portfolio. Linear pioneered precision power management ICs for demanding environments including automotive and industrial markets.
The LTC1255CN8#PBF belongs to Linear's high-side driver family engineered specifically for ruggedized 12V/24V load switching - emphasizing fault autonomy, ultra-low quiescent current, and seamless integration with N-channel MOSFETs in space- and cost-sensitive designs.
FAQ
What is the maximum supply voltage the LTC1255CN8#PBF can withstand during transients?
The LTC1255CN8#PBF is rated for 40V transients lasting ≤10ms per Absolute Maximum Ratings table. This allows safe operation in automotive environments subject to load-dump events per ISO 7637-2 Pulse 5a. Sustained operation above 24V is not permitted; the device must be powered within 9V–24V DC for normal functionality. The 40V rating applies only to short-duration spikes.
Does the LTC1255CN8#PBF require external Zener diodes on the gate outputs?
Yes - the LTC1255CN8#PBF gate outputs (G1/G2) are designed to drive external 12V Zener diodes (e.g., MMBZ5242A) connected between gate and source of the N-channel MOSFET. This clamps VGS to prevent exceeding the MOSFET's absolute maximum rating. The datasheet explicitly recommends this configuration in Note 3 and Typical Application Circuits TA01–TA13.
Can the LTC1255CN8#PBF drive MOSFETs with gate thresholds higher than 2.5V?
The LTC1255CN8#PBF generates gate voltage up to 12V above VS, so it can fully enhance N-channel MOSFETs with VGS(th) up to ~4V when VS = 12V (i.e., VG = 24V). However, for devices with VGS(th) > 3V, verify RDS(on) at the actual applied VGS using the MOSFET's datasheet. The LTC1255CN8#PBF itself does not regulate gate voltage beyond the charge pump's fixed boost range.
How is overcurrent delay implemented on the LTC1255CN8#PBF?
Overcurrent delay is implemented externally by adding an RC network between the DS1/DS2 pin and the sense resistor. The LTC1255CN8#PBF's internal comparator has a fixed 100mV threshold; the RC time constant determines how long the sensed voltage must exceed that threshold before latching off. Figure F05 in the datasheet provides normalized timing curves to select RDELAY and CDELAY values based on required trip current and delay.
Is the LTC1255CN8#PBF pin-compatible with the LTC1255IN8#PBF?
Yes - the LTC1255CN8#PBF and LTC1255IN8#PBF share identical pinout, package dimensions, and electrical specifications except for temperature grade. The 'C' version is rated for 0°C to 70°C operation, while the 'I' version extends to –40°C to 85°C. Both use the same N8 (PDIP-8) footprint and may be substituted in non-automotive or non-industrial ambient environments without layout changes.
LTC1255CN8#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:
- 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:
- Through Hole
- Supplier Device Package:
- 8-PDIP
LTC1255CN8#PBF FAQ
1.How can I place an order for LTC1255CN8#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC1255CN8#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 LTC1255CN8#PBF reliable?
The price and inventory of LTC1255CN8#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC1255CN8#PBF is usually 5 days.
3.What payment methods are accepted for LTC1255CN8#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC1255CN8#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC1255CN8#PBF?
LTC1255CN8#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC1255CN8#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 LTC1255CN8#PBF?
For technical support, including LTC1255CN8#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC1255CN8#PBF requirements.
6.How does Aetrix verify that LTC1255CN8#PBF is sourced from the original manufacturer or authorized distributors?
All LTC1255CN8#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 LTC1255CN8#PBF meets industry standards.
7.What is the process for return or replacement of LTC1255CN8#PBF?
All LTC1255CN8#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC1255CN8#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 LTC1255CN8#PBF part is unused and in its original packaging.
Return procedure for LTC1255CN8#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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