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Analog Devices Inc. LT1171HVCQ#TRPBF
- Part No.:
- LT1171HVCQ#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- TO-263-6, D2PAK (5 Leads + Tab), TO-263BA
- Datasheet:
-
LT1171HVCQ#TRPBF.pdf
- Description:
- IC REG BUCK BST ADJ 2.5A DDPAK-5
- Quantity:
- Payment:
- Shipping:
Inventory:2,681
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Product details
Overview
LT1171HVCQ#TRPBF from Analog Devices (formerly Linear Technology) is a monolithic high-efficiency current-mode switching regulator IC with integrated 2.5A/75V power switch, operating from 3V to 60V input and delivering up to 50W in buck/boost/flyback topologies. It features 100kHz fixed-frequency operation, 6mA quiescent current, shutdown mode drawing 50µA, and supports isolated flyback regulation via dedicated FB pin functionality.
For engineers reviewing the LT1171HVCQ#TRPBF datasheet, LT1171HVCQ#TRPBF pinout, LT1171HVCQ#TRPBF application, or LT1171HVCQ#TRPBF equivalent, key selection criteria include HV-grade 75V switch breakdown, 5-lead DD package thermal performance (θJA ≈ 25–45°C/W), flyback reference voltage of 15.0–18.0V, and adaptive anti-saturation drive for wide load-current efficiency retention.
Technical Context
The LT1171HVCQ#TRPBF implements current-mode control with internal 100kHz oscillator, where switch duty cycle is directly set by sensed switch current rather than output voltage error-enabling fast line transient response and simplified loop compensation. Its dual-error-amplifier architecture supports both standard regulation (via 1.24V FB reference) and isolated flyback mode (via 15V–18V flyback reference).
Switch protection includes pulse-by-pulse current limiting, adaptive anti-saturation drive to minimize VCE(sat) and driver loss, and thermal foldback under overload. The VC pin serves quadruple functions: error amplifier output (gm = 3000–4400 µmho), soft-start node, current limit adjust point, and shutdown control (≤0.15V triggers 50µA mode).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 3V to 60V - supports wide industrial, automotive, and battery-derived supplies without external pre-regulation. |
| Switch Breakdown Voltage | 75V - enables safe operation with 55V max input in fully isolated flyback mode per datasheet Note 5. |
| Max Switch Current | 2.5A (TJ ≥ 25°C, 50% duty cycle) - defines peak power capability in non-continuous conduction modes. |
| Quiescent Current | 6mA - ensures low standby loss in always-on systems; drops to 50µA in shutdown. |
| Switching Frequency | 88–115kHz (typ. 100kHz) - balances EMI, inductor size, and efficiency for medium-power DC/DC designs. |
| Flyback Reference Voltage | 15.0–18.0V (IFB = 50µA) - sets regulated amplitude of transformer-coupled flyback pulse for isolated output control. |
| Error Amp Transconductance | 3000–4400 µmho - determines loop gain stability margin and compensation component sizing. |
Pinout & Package
LT1171HVCQ#TRPBF uses the 5-lead DD (Dual Drain) plastic package with exposed tab connected to GND. Thermal resistance varies with PCB copper area (≈25°C/W with 2.8 in² 1oz Cu; ≈45°C/W with 0.2 in²).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN | Power Input | Primary supply connection; accepts 3V–60V; powers internal 2.3V regulator and switch driver. |
| VSW | Switch Output | Collector of internal NPN power transistor; connects to inductor/diode in buck/boost/flyback configurations. |
| GND | Ground Reference | Power and signal ground; tab is internally tied to this pin; critical for thermal and noise integrity. |
| FB | Feedback Input | High-impedance input sensing output voltage (1.24V ref) or enabling flyback mode (pull ≤0.54V). |
| VC | Error Amplifier Output | Current-output node (gm amp); sets switch current limit, enables soft-start, and controls shutdown when ≤0.15V. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated 2.5A/75V switch | Eliminates external MOSFET in ≤50W applications; reduces BOM count and layout complexity. |
| Flyback-regulated mode | Enables fully floating outputs with no optocoupler needed; supports multi-rail isolated supplies. |
| Adaptive anti-saturation drive | Maintains high efficiency across 0.1A–2.5A load range by dynamically optimizing base drive. |
| Shutdown mode (50µA) | Meets ultra-low-power requirements for battery-backed or energy-harvesting systems. |
| Self-protected overload handling | Provides pulse-by-pulse current limiting and thermal foldback without external sensing circuitry. |
Applications
| Industrial Power Supply | Battery-Powered Upconverter |
|---|---|
Use Scenario: 24V industrial bus powering 12V logic and ±15V op-amp rails in PLC I/O modules. IC Role / Device Role / Timing Role: Primary controller in synchronous flyback topology delivering isolated, regulated outputs. Use Value: Eliminates need for optocouplers or secondary-side controllers; achieves >85% efficiency at full load with single LT1171HVCQ#TRPBF. | Use Scenario: Portable test equipment converting 7.4V Li-ion (2S) to 15V analog supply for precision ADC front-end. IC Role / Device Role / Timing Role: Boost regulator with soft-start and shutdown control for battery life extension. Use Value: 6mA quiescent current minimizes standby drain; 75V switch withstands battery surge transients up to 60V. |
| Automotive Subsystem Supply | Medical Isolated Sensor Bias |
Use Scenario: 12V vehicle battery powering 5V microcontroller and 3.3V sensor interface in ADAS camera module. IC Role / Device Role / Timing Role: Buck converter with input undervoltage lockout and overtemperature protection. Use Value: Wide 3V–60V input accommodates cold-crank (6.5V) and load-dump (40V+) conditions without external TVS. | Use Scenario: Patient-connected biosensor requiring reinforced isolation between analog front-end and digital MCU. IC Role / Device Role / Timing Role: Flyback controller regulating dual floating outputs (±5V) from 5V system rail. Use Value: Internal flyback reference eliminates feedback winding ratio dependency; meets IEC 60601 creepage/clearance via transformer barrier. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar high-voltage switching regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LT1171HVCT#TRPBF | Same IC die but in 5-lead TO-220 package; θJA = 75°C/W vs. Q-package's variable 25–45°C/W. | Better thermal performance in high-ambient or continuous-load environments; requires larger PCB footprint. | Choose for >30W sustained output or ambient >60°C; avoid if space-constrained or cost-sensitive. |
| LT3573EDD#TRPBF | Higher integration: includes internal 2.5A/60V switch, 2.2MHz frequency, spread-spectrum EMI reduction, and fault reporting pin. | Supports smaller magnetics and lower output ripple; lacks flyback reference mode and HV-grade 75V switch. | Choose for compact, low-noise designs below 30W; not suitable for >55V flyback or 60V+ input systems. |
Compared with LT1171HVCT#TRPBF and LT3573EDD#TRPBF, the LT1171HVCQ#TRPBF offers superior thermal flexibility on dense boards and unique flyback regulation capability-but trades off higher EMI and lower switching frequency versus modern alternatives.
Availability
LT1171HVCQ#TRPBF is available at Aetrix Electronics and suitable for industrial power supplies, battery-powered upconverters, automotive subsystems, and medical isolated sensor bias requiring stable component supply and long-term lifecycle support.
Supply support for LT1171HVCQ#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, documentation, and manufacturing continuity for legacy Linear parts including the LT117x family.
The LT117x series was designed as monolithic high-power switching regulators targeting medium-power DC/DC conversion in space- and cost-constrained systems where simplicity and ruggedness outweigh ultra-high efficiency or high-frequency operation.
FAQ
What is the maximum input voltage rating for LT1171HVCQ#TRPBF in flyback mode?
The LT1171HVCQ#TRPBF has an absolute maximum switch voltage rating of 75V and a recommended maximum input voltage of 55V in fully isolated flyback mode per datasheet Note 5, to ensure safe operation within the switch breakdown margin while maintaining regulation accuracy and reliability.
Does LT1171HVCQ#TRPBF support external synchronization?
Yes, the LT1171HVCQ#TRPBF can be externally synchronized between 120kHz and 160kHz by pulling the VC pin to ground with a narrow (<0.3µs) transistor pulse; this overrides the internal 100kHz oscillator while preserving current-mode control and protection functions.
How does the flyback regulation mode work on LT1171HVCQ#TRPBF?
In flyback mode, the LT1171HVCQ#TRPBF uses its FB pin to sense the reflected flyback pulse voltage; when FB is pulled below 0.54V, it disconnects the main error amplifier and activates a dedicated flyback amplifier with 15.0–18.0V reference, enabling regulation of isolated outputs without optocouplers or secondary-side sensing.
What is the thermal resistance (θJA) of the LT1171HVCQ#TRPBF package?
The LT1171HVCQ#TRPBF uses a 5-lead DD package with thermal resistance varying from ~25°C/W (with 2.8 in² of 1oz copper) to ~45°C/W (with 0.2 in²), depending on PCB layout; no fixed θJA value is specified because it is board-dependent per datasheet footnote.
Can LT1171HVCQ#TRPBF be used in boost configuration with 5V input to 12V output?
Yes, the LT1171HVCQ#TRPBF is validated for boost operation (e.g., 5V→12V @ 1A) in the datasheet Typical Application section; it delivers >85% efficiency using standard external components including a 50µH inductor and MBR330 Schottky diode, with minimal external parts required.
LT1171HVCQ#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:
- 0°C ~ 100°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DDPAK-5
LT1171HVCQ#TRPBF FAQ
1.How can I place an order for LT1171HVCQ#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT1171HVCQ#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 LT1171HVCQ#TRPBF reliable?
The price and inventory of LT1171HVCQ#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT1171HVCQ#TRPBF is usually 5 days.
3.What payment methods are accepted for LT1171HVCQ#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT1171HVCQ#TRPBF transactions.
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4.How is shipping managed for LT1171HVCQ#TRPBF?
LT1171HVCQ#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT1171HVCQ#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 LT1171HVCQ#TRPBF?
For technical support, including LT1171HVCQ#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT1171HVCQ#TRPBF requirements.
6.How does Aetrix verify that LT1171HVCQ#TRPBF is sourced from the original manufacturer or authorized distributors?
All LT1171HVCQ#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 LT1171HVCQ#TRPBF meets industry standards.
7.What is the process for return or replacement of LT1171HVCQ#TRPBF?
All LT1171HVCQ#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LT1171HVCQ#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 LT1171HVCQ#TRPBF part is unused and in its original packaging.
Return procedure for LT1171HVCQ#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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