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Analog Devices Inc. LT1171HVIQ#TRPBF
- Part No.:
- LT1171HVIQ#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- TO-263-6, D2PAK (5 Leads + Tab), TO-263BA
- Datasheet:
-
LT1171HVIQ#TRPBF.pdf
- Description:
- IC REG BUCK BST ADJ 2.5A DDPAK-5
- Quantity:
- Payment:
- Shipping:
Inventory:2,334
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Product details
Overview
LT1171HVIQ#TRPBF from Analog Devices (formerly Linear Technology) is a monolithic high-efficiency 2.5A switching regulator IC in a 5-lead plastic TO-220 package, operating from 3V to 60V input, delivering up to 100W output power in buck/boost/flyback topologies, with internal 2.5A switch, 100kHz fixed-frequency current-mode control, and –40°C to 100°C industrial temperature range.
For engineers reviewing the LT1171HVIQ#TRPBF datasheet, LT1171HVIQ#TRPBF pinout, LT1171HVIQ#TRPBF application, or LT1171HVIQ#TRPBF equivalent, key selection criteria include input voltage range (3–60V), integrated switch current rating (2.5A), flyback-regulated floating output capability, shutdown quiescent current (50µA), and thermal performance in TO-220 package without heatsink under typical loads.
Technical Context
The LT1171HVIQ#TRPBF implements current-mode switching control with adaptive anti-saturation drive for wide load-current efficiency stability. Its error amplifier delivers 3000–4400 µmho transconductance and regulates via feedback pin (FB) referenced to 1.224–1.264V internal bandgap.
It supports multiple topologies-buck, boost, flyback, forward, inverting, and Cuk-using external components only. Flyback mode uses dedicated internal amplifier with 15.0–18.0V reference and 1.5µs blanking time to reject leakage spikes, enabling fully floating outputs with transformer isolation.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 3V to 60V - enables direct operation from 12V/24V/48V industrial rails or wide-range battery inputs without pre-regulation. |
| Switch Current Rating | 2.5A (typical), 5.0A peak - defines maximum continuous inductor current in buck/boost; limits output power to ~60W at 24V out. |
| Switching Frequency | 88–115 kHz (typ. 100 kHz) - balances EMI, inductor size, and efficiency; supports external synchronization to 120–160 kHz. |
| Reference Voltage | 1.224–1.264 V - tight 3.3% tolerance enables ±1% output regulation with standard resistor dividers. |
| Quiescent Current | 6 mA (active), 50 µA (shutdown) - allows low-power standby in battery systems; shutdown reduces system sleep current significantly. |
| Flyback Reference | 15.0–18.0 V - sets isolated output voltage scaling in flyback mode; enables regulation without optocoupler feedback. |
| Thermal Range | –40°C to +100°C (operating junction) - qualified for industrial environments; TO-220 package supports 75°C/W θJA without heatsink. |
Pinout & Package
LT1171HVIQ#TRPBF uses a 5-lead plastic TO-220 package (T package) with tab connected to GND. Pin 1 = VIN, Pin 2 = VSW, Pin 3 = GND (tab), Pin 4 = FB, Pin 5 = VC. All pins are electrically validated per Linear Technology LT1170/LT1171/LT1172 datasheet Rev. 117012fi.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN (Pin 1) | Main power input | Accepts 3–60V DC; supplies internal 2.3V regulator and switch driver; requires local 1µF ceramic bypass. |
| VSW (Pin 2) | Switch collector output | Drives external inductor/diode; rated 75V breakdown; connects to primary side in flyback or high-side in buck. |
| GND (Pin 3, Tab) | Power and signal ground | Common return for switch, feedback, and control circuits; tab provides thermal path and must be soldered to PCB copper. |
| FB (Pin 4) | Feedback input | Senses output via resistor divider; <0.54V selects flyback mode; 1.24V nominal sets regulated output voltage. |
| VC (Pin 5) | Error amplifier output / control | 0.9–2.0V during regulation; clamping controls current limit; <0.15V enables shutdown; used for soft-start and sync. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated 2.5A, 75V switch | Eliminates external MOSFET in ≤60W designs; reduces BOM count and layout complexity in buck/boost/flyback converters. |
| Current-mode control | Provides inherent cycle-by-cycle current limiting, fast line transient response, and simplified loop compensation across wide input/output ranges. |
| Flyback-regulated floating outputs | Enables isolated multi-output supplies without optocouplers or secondary-side sensing-ideal for medical or industrial isolation requirements. |
| Adaptive anti-saturation drive | Maintains high efficiency across 10:1 load range by dynamically adjusting gate drive to minimize switch conduction loss and recovery time. |
| Shutdown mode (50 µA) | Supports ultra-low-power sleep states in portable or energy-harvesting systems; activated by pulling VC below 0.15V. |
Applications
| Logic Supply Generation | Battery Upconverter |
|---|---|
Use Scenario: Generating stable 5V/10A logic rail from a 12V intermediate bus in industrial PLC backplanes. IC Role / Device Role / Timing Role: Primary switching controller in synchronous buck configuration, regulating output using FB feedback and VC-based current limit. Use Value: Delivers high-current logic supply with <1% load regulation and no external pass transistor, reducing board area and thermal design burden. | Use Scenario: Boosting 3.6V Li-ion battery voltage to 12V for powering legacy sensors or actuators in portable test equipment. IC Role / Device Role / Timing Role: High-efficiency boost converter core with adaptive anti-sat drive maintaining >88% efficiency down to 100mA load. Use Value: Extends battery runtime by minimizing quiescent loss and enabling deep-discharge operation to 3.0V input. |
| Flyback Isolated Power | Op Amp Dual-Rail Supply |
Use Scenario: Providing isolated ±15V analog rails for precision instrumentation amplifiers in medical data acquisition systems. IC Role / Device Role / Timing Role: Flyback controller regulating secondary winding voltage via primary-side sensing; uses internal flyback amplifier and 15V reference. Use Value: Achieves reinforced isolation (up to transformer breakdown rating) without optocoupler or secondary-side regulator, simplifying certification. | Use Scenario: Converting 5V USB power to ±15V for rail-to-rail op amps in portable audio analyzers. IC Role / Device Role / Timing Role: Inverting topology controller generating negative output while sourcing positive current from same 5V input. Use Value: Enables dual-rail analog circuitry from single low-voltage source, with <2% cross-regulation between rails due to current-mode control. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar switching regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTC3703IGN#TRPBF | External MOSFET driver (no integrated switch); 1.5–36V input; 1MHz sync capability; higher efficiency at light loads. | Requires external high-side N-channel MOSFET; better suited for >100W or high-density layouts where thermal separation is critical. | Select when higher frequency (reduced inductor size), programmable frequency, or discrete FET optimization is required. |
| LM2596S-ADJ/NOPB | 3A integrated switch; 4.5–40V input; 150kHz fixed frequency; lower max input voltage and no flyback mode support. | Limited to non-isolated topologies; lacks flyback regulation, shutdown current >100µA, and industrial temp grade. | Select for cost-sensitive, non-isolated DC/DC needs where 40V max input and commercial temp suffice. |
Compared with LTC3703IGN#TRPBF and LM2596S-ADJ/NOPB, LT1171HVIQ#TRPBF uniquely combines 60V input tolerance, flyback isolation capability, and –40°C to 100°C operation in a single TO-220 package-making it optimal for ruggedized isolated power in industrial edge devices.
Availability
LT1171HVIQ#TRPBF is available at Aetrix Electronics and suitable for industrial power conversion, isolated sensor interface supplies, and battery-powered upconverter applications requiring stable component supply, long-term lifecycle support, and guaranteed traceable sourcing.
Supply support for LT1171HVIQ#TRPBF 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 full product support, datasheets, and application notes for the LT117x family.
The LT117x series was designed as monolithic high-power switching regulators targeting industrial, telecom, and instrumentation systems needing robust, topology-flexible DC/DC conversion without external switches.
FAQ
What is the maximum input voltage rating for LT1171HVIQ#TRPBF?
The LT1171HVIQ#TRPBF is an HV-grade variant with absolute maximum supply voltage of 60V and switch breakdown voltage of 75V. This allows reliable operation directly from 48V industrial buses or automotive cold-crank conditions up to 60V, provided external components (e.g., catch diode, inductor) are rated accordingly.
Does LT1171HVIQ#TRPBF support flyback topology with isolated outputs?
Yes, LT1171HVIQ#TRPBF supports flyback mode via its dedicated internal flyback amplifier. When FB pin voltage drops below 0.54V, it engages flyback regulation using a 15.0–18.0V reference, enabling fully floating outputs with transformer isolation-no optocoupler or secondary-side feedback required.
What is the thermal resistance (θJA) of LT1171HVIQ#TRPBF in its TO-220 package?
The LT1171HVIQ#TRPBF in the T-package (5-lead plastic TO-220) has a specified θJA of 75°C/W under standard JEDEC test conditions. With proper PCB copper area (≥1 sq. in. 2 oz.), actual thermal performance improves, supporting 2.5A continuous operation without heatsink at ambient ≤60°C.
Can LT1171HVIQ#TRPBF be synchronized to an external clock?
Yes, LT1171HVIQ#TRPBF supports external synchronization from 120kHz to 160kHz by pulling the VC pin to ground with a narrow (<0.3µs) pulse via an external transistor. This avoids interference with regulation while enabling EMI reduction through frequency dithering or system-level clock alignment.
What is the shutdown current consumption of LT1171HVIQ#TRPBF?
The LT1171HVIQ#TRPBF draws only 50µA typical supply current in shutdown mode, achieved by pulling the VC pin below 0.15V. This ultra-low standby current makes it suitable for battery-backed systems where multi-year shelf life and minimal self-discharge are critical design requirements.
LT1171HVIQ#TRPBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- TO-263-6, D2PAK (5 Leads + Tab), TO-263BA
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Function:
- Step-Up, Step-Down, Step-Up/Step-Down
- Output Configuration:
- Positive or Negative
- Topology:
- Buck, Boost, Cuk, Flyback, Forward Converter
- Output Type:
- Adjustable
- Number of Outputs:
- 1
- Voltage - Input (Min):
- 3V
- Voltage - Input (Max):
- 60V
- Voltage - Output (Min/Fixed):
- 1.244V
- Voltage - Output (Max):
- 75V (Switch)
- Current - Output:
- 2.5A (Switch)
- Frequency - Switching:
- 100kHz
- Synchronous Rectifier:
- No
- Operating Temperature:
- -40°C ~ 100°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DDPAK-5
LT1171HVIQ#TRPBF FAQ
1.How can I place an order for LT1171HVIQ#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT1171HVIQ#TRPBF 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 LT1171HVIQ#TRPBF reliable?
The price and inventory of LT1171HVIQ#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT1171HVIQ#TRPBF is usually 5 days.
3.What payment methods are accepted for LT1171HVIQ#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT1171HVIQ#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT1171HVIQ#TRPBF?
LT1171HVIQ#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT1171HVIQ#TRPBF 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 LT1171HVIQ#TRPBF?
For technical support, including LT1171HVIQ#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT1171HVIQ#TRPBF requirements.
6.How does Aetrix verify that LT1171HVIQ#TRPBF is sourced from the original manufacturer or authorized distributors?
All LT1171HVIQ#TRPBF 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 LT1171HVIQ#TRPBF meets industry standards.
7.What is the process for return or replacement of LT1171HVIQ#TRPBF?
All LT1171HVIQ#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LT1171HVIQ#TRPBF, 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 LT1171HVIQ#TRPBF part is unused and in its original packaging.
Return procedure for LT1171HVIQ#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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