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Analog Devices Inc. LTC1153IS8#PBF
- Part No.:
- LTC1153IS8#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Power Management - Specialized
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
LTC1153IS8#PBF.pdf
- Description:
- IC ELECTR CIRCUIT BREAKER 8-SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:880
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Product details
Overview
LTC1153IS8#PBF from Analog Devices (formerly Linear Technology) is an auto-reset electronic circuit breaker IC that drives external N-channel MOSFETs to protect sensitive loads from over-current, thermal, and short-circuit faults. It features programmable trip current (1mA–>20A), trip delay (15µs–>100ms), and auto-reset time (1ms–>10s), operates from 4.5V–18V, and delivers 8µA standby quiescent current. It is used in SCSI termination power, battery short-circuit protection, and DC motor stall protection.
For engineers reviewing the LTC1153IS8#PBF datasheet, LTC1153IS8#PBF pinout, LTC1153IS8#PBF application, or LTC1153IS8#PBF equivalent, this page provides verified functional specifications, SOIC-8 package details, gate drive timing characteristics, drain-sense threshold accuracy (100mV ±20mV), and real-world implementation guidance for resistive, inductive, capacitive, and lamp loads.
Technical Context
The LTC1153IS8#PBF integrates a charge-pump-based gate driver capable of generating VGATE up to VS + 25V (at VS = 12V), enabling robust turn-on of low-RDS(ON) N-MOSFETs without external capacitors. Its analog comparator continuously monitors VDS via a precision 100mV reference, with built-in 10µs minimum trip delay to suppress false triggering from transients.
Auto-reset is implemented using an external timing capacitor (CT) charged at 4.2µA; when CT reaches ~2.5V, the latch resets and gate drive resumes. The shutdown input interfaces directly with PTC thermistors for thermal fault detection, while the open-drain STATUS output reports tripped state to µP systems.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage | 4.5V to 18V - supports wide-input industrial and automotive bus rails without external regulation. |
| Drain Sense Threshold | 100mV ±20mV - sets trip current via external RSEN; enables accurate 1mA–20A range with <1% sense resistor tolerance. |
| Standby Quiescent Current | 8µA at VS = 5V - enables always-on protection in battery-powered systems with minimal leakage impact. |
| Gate Drive Voltage Above Supply | Up to VS + 25V at VS = 12V - ensures full enhancement of logic-level and standard N-MOSFETs with margin. |
| Minimum Trip Delay | 5µs - fast response to hard shorts while suppressing supply/load transients via internal filtering. |
| Status Output Type | Open-drain - allows wired-OR fault reporting across multiple breakers and direct µP interface with 51k pull-up. |
| Operating Temperature | –40°C to 85°C - qualified for industrial ambient environments per IS8 package rating. |
Pinout & Package
Package: 8-pin SOIC (S8), surface-mount, JEDEC MS-012AC compliant, 3.9mm × 4.9mm footprint, 1.27mm pitch.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| IN | Active-high enable input | CMOS-compatible TTL/CMOS logic input; activates protection circuitry and gate drive when high. |
| CT | Auto-reset timing capacitor node | Charged at 4.2µA to set reset interval; voltage threshold ~2.5V triggers retry cycle. |
| STATUS | Fault status output | Open-drain output pulled low during trip; requires external pull-up to logic rail for µP interrupt. |
| GND | Analog/digital ground reference | Common return for sense resistor, logic, and charge pump; Kelvin connection to VS improves accuracy. |
| VS | Power supply input | Supplies all internal circuitry and provides Kelvin reference for drain-sense comparator. |
| DS | Drain sense input | High-impedance comparator input referenced to VS; trips when VDS > 100mV (i.e., ILOAD × RSEN > 100mV). |
| G | MOSFET gate driver output | Adaptive charge-pump output driving gate above VS; capable of sourcing >100µA peak current. |
| SHUTDOWN | Thermal/fault shutdown input | CMOS input tied to PTC thermistor; asserts shutdown when temperature exceeds threshold (e.g., 70°C or 100°C). |
Key Features
| Feature | Design Value |
|---|---|
| No external charge pump capacitors | On-chip adaptive charge pump eliminates need for external flying caps-reduces BOM count and PCB area. |
| Programmable trip delay down to 15µs | Configurable RC network between DS and RSEN enables precise transient immunity tuning for motor inrush or capacitor charging. |
| Thermal trip with PTC thermistor interface | Dedicated SHUTDOWN pin accepts direct PTC connection-enables dual-fault protection (over-current + over-temperature) without extra comparators. |
| 8µA standby IQ | Ultra-low quiescent current preserves battery life in always-on protection applications such as portable medical or IoT edge devices. |
| Drives low RDS(ON) N-channel MOSFETs | VGATE up to VS + 25V ensures full enhancement of cost-effective 20mΩ–100mΩ MOSFETs, minimizing conduction loss and heat rise. |
Applications
| Power Bus Circuit Breaker | SCSI Termination Power Protection |
|---|---|
Use Scenario: Protecting 5V/12V backplane power buses against short circuits caused by hot-plug insertion or connector faults. IC Role / Device Role / Timing Role: Acts as intelligent load switch with auto-retry; senses over-current via 0.02Ω RSEN and interrupts power within 15µs. Use Value: Prevents bus collapse and upstream regulator shutdown while allowing automatic recovery after fault removal-no manual reset required. | Use Scenario: Safeguarding SCSI-2/3 termination regulators (e.g., 5V/1A) from accidental shorts due to cable misconnection or board-level ESD events. IC Role / Device Role / Timing Role: Electronic fuse with 1ms trip delay and 200ms auto-reset period; STATUS pin signals fault to host controller. Use Value: Maintains system uptime during transient faults and avoids permanent damage to termination resistors or LDOs. |
| Battery Short-Circuit Protection | DC Motor Stall Protection |
Use Scenario: Inserted between Li-ion pack (3.7V–4.2V) and load to prevent fire hazard during cell-to-cell short or damaged wiring. IC Role / Device Role / Timing Role: High-side circuit breaker with 100mV sense threshold; uses 0.1Ω RSEN to trigger at 1A, configurable up to >20A. Use Value: Limits fault energy to safe levels (<100mJ) before MOSFET failure-critical for UL/IEC 62368-1 compliance. | Use Scenario: Monitoring 12V DC motor windings (e.g., automotive window lift) for stall conditions where current surges to 5–10× rated value. IC Role / Device Role / Timing Role: Current-limited switch with thermal backup; SHUTDOWN pin connected to PTC on motor housing triggers at 70°C. Use Value: Prevents coil burnout and MOSFET destruction by combining fast electrical trip (15µs) and slower thermal cutoff (100ms). |
Equivalent & Alternatives
The following parts are listed as comparable options for similar electronic circuit breaker applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS2559DRCT | Fixed 1.5A trip current; no programmable delay or auto-reset; integrated MOSFET; 2.7V–6.5V supply. | Suitable only for low-voltage, fixed-current USB/5V rail protection-not for wide-range industrial use. | Select when simplicity and integration outweigh programmability needs and supply stays ≤6.5V. |
| MAX16054ATA+ | Programmable trip current (50mA–5A); no thermal shutdown input; 2.7V–5.5V supply; no charge pump. | Limited to low-voltage logic rails; cannot drive high-threshold MOSFETs without external level shift. | Choose for compact 3.3V/5V systems requiring basic programmability but not high-side gate boosting or thermal sensing. |
Compared with TPS2559DRCT and MAX16054ATA+, the LTC1153IS8#PBF uniquely supports wide 4.5V–18V operation, external MOSFET drive with charge-pump boost, independent thermal shutdown, and fully programmable trip/reset timing-making it the only option for ruggedized, field-deployable over-current protection.
Availability
LTC1153IS8#PBF is available at Aetrix Electronics and suitable for power bus circuit breaking, SCSI termination protection, and battery short-circuit safeguarding requiring stable component supply across industrial design cycles.
Supply support for LTC1153IS8#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 of high-performance analog and mixed-signal ICs for precision power, signal conditioning, and protection.
The LTC1153IS8#PBF belongs to Linear's electronic circuit breaker product line, designed specifically for robust, self-recovering over-current protection in harsh environments where reliability, programmability, and MOSFET flexibility are critical.
FAQ
What is the maximum gate drive voltage capability of the LTC1153IS8#PBF?
The LTC1153IS8#PBF generates a gate drive voltage up to VS + 25V when VS = 12V, enabling full enhancement of standard-threshold N-channel MOSFETs without external level-shifting circuitry. This capability is confirmed in the Electrical Characteristics table under "VGATE – VS" parameter and applies across the full operating temperature range. The LTC1153IS8#PBF achieves this using an on-chip adaptive charge pump, eliminating need for external flying capacitors.
How does the LTC1153IS8#PBF implement thermal protection?
The LTC1153IS8#PBF implements thermal protection via its dedicated SHUTDOWN pin, which accepts direct connection to a PTC thermistor mounted on the MOSFET heatsink or load. When the PTC resistance rises sharply at its trip temperature (e.g., 70°C or 100°C), the SHUTDOWN input crosses its 2.0V threshold and forces immediate gate discharge. This function operates independently of over-current detection and is documented in the Applications Information section and Figure TA03–TA04 schematics. The LTC1153IS8#PBF remains latched off until SHUTDOWN returns low.
Can the LTC1153IS8#PBF be used with P-channel MOSFETs?
No, the LTC1153IS8#PBF is designed exclusively for driving N-channel MOSFETs in high-side configuration. Its DS pin compares voltage relative to VS (not GND), and its gate driver architecture sources current above VS to enhance N-MOSFETs. Driving P-channel devices would require inversion of sense polarity and sinking gate drive below VS-neither supported by the LTC1153IS8#PBF's internal topology. Application notes TA01–TA15 exclusively show N-MOSFET implementations.
What is the minimum trip delay achievable with the LTC1153IS8#PBF?
The minimum trip delay of the LTC1153IS8#PBF is 5µs, measured from over-current onset to gate discharge initiation, as specified in the Electrical Characteristics table under "tTD Minimum Trip Delay" at VS = 5V and VS = 12V. This value includes internal comparator propagation and latch response time and is independent of external RC networks. The LTC1153IS8#PBF achieves this speed while maintaining immunity to sub-microsecond supply transients via built-in filtering.
Does the LTC1153IS8#PBF require external components for basic operation?
Yes-the LTC1153IS8#PBF requires at minimum: (1) an external N-channel MOSFET, (2) a drain-sense resistor (RSEN) to set trip current, (3) a timing capacitor (CT) to configure auto-reset period, and (4) a pull-up resistor on STATUS for µP interfacing. Unlike integrated load switches, it does not embed the power FET. However, it eliminates external charge pump capacitors and provides internal voltage regulation, reducing total external part count to just four passive components for functional operation. All examples in the datasheet (e.g., TA01, TA02) confirm this minimal BOM requirement.
LTC1153IS8#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
- Applications:
- Overvoltage Protection, Circuit Breaker
- Current - Supply:
- 180µA
- Voltage - Supply:
- 4.5V ~ 18V
- Operating Temperature:
- 0°C ~ 70°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SO
LTC1153IS8#PBF FAQ
1.How can I place an order for LTC1153IS8#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC1153IS8#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 LTC1153IS8#PBF reliable?
The price and inventory of LTC1153IS8#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC1153IS8#PBF is usually 5 days.
3.What payment methods are accepted for LTC1153IS8#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC1153IS8#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC1153IS8#PBF?
LTC1153IS8#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC1153IS8#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 LTC1153IS8#PBF?
For technical support, including LTC1153IS8#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC1153IS8#PBF requirements.
6.How does Aetrix verify that LTC1153IS8#PBF is sourced from the original manufacturer or authorized distributors?
All LTC1153IS8#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 LTC1153IS8#PBF meets industry standards.
7.What is the process for return or replacement of LTC1153IS8#PBF?
All LTC1153IS8#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC1153IS8#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 LTC1153IS8#PBF part is unused and in its original packaging.
Return procedure for LTC1153IS8#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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