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Analog Devices Inc. LT1172HVCQ#TRPBF
- Part No.:
- LT1172HVCQ#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- TO-263-6, D2PAK (5 Leads + Tab), TO-263BA
- Datasheet:
-
LT1172HVCQ#TRPBF.pdf
- Description:
- IC REG BCK BST ADJ 1.25A DDPAK-5
- Quantity:
- Payment:
- Shipping:
Inventory:1,216
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Product details
Overview
LT1172HVCQ#TRPBF from Analog Devices (formerly Linear Technology) is a monolithic high-efficiency current-mode switching regulator IC with integrated 1.25A switch, operating from 3V to 60V input and delivering up to 25W in buck/boost/flyback topologies. It features 100kHz fixed-frequency operation, 6mA quiescent current, and shutdown mode drawing only 50µA - used in isolated flyback power supplies for industrial sensors and battery-powered instrumentation.
For engineers reviewing the LT1172HVCQ#TRPBF datasheet, LT1172HVCQ#TRPBF pinout, LT1172HVCQ#TRPBF application, or LT1172HVCQ#TRPBF equivalent, key selection criteria include its HV-grade 75V switch breakdown voltage, Q-package thermal performance (θJA ≈ 25–45°C/W), flyback-regulated floating output capability, and compatibility with external synchronization up to 160kHz.
Technical Context
The LT1172HVCQ#TRPBF implements current-mode control with adaptive anti-saturation drive for wide load-current efficiency stability. Its dual error amplifier architecture supports both normal regulation (1.24V reference at FB) and flyback mode (15.0–18.0V programmable reference), enabling fully floating outputs without optocouplers.
It integrates oscillator, PWM comparator, protection logic, and a 1.25A/75V DMOS switch in a thermally enhanced 5-lead DD (Q) package. The VC pin serves quadruple functions: compensation node, current limit adjustment, soft-start control, and shutdown activation below 0.15V.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 3V to 60V - supports wide-range industrial and automotive battery inputs without pre-regulation. |
| Switch Breakdown Voltage | 75V - enables safe operation in 48V systems with transient margin; HV grade distinguishes it from standard 65V variants. |
| Max Switch Current | 1.25A (TJ ≥ 25°C, 50% duty cycle) - defines maximum continuous output power in buck/boost configurations. |
| Quiescent Current | 6mA - ensures low no-load loss in always-on applications like remote sensor nodes. |
| Shutdown Current | 50µA - allows ultra-low-power standby in battery backup systems. |
| Switching Frequency | 88–115kHz (typ. 100kHz) - balances EMI, inductor size, and efficiency; externally synchronizable to 120–160kHz. |
| Flyback Reference Voltage | 15.0–18.0V (at IFB = 50µA) - sets regulated flyback pulse amplitude for transformer-coupled isolated outputs. |
Pinout & Package
The LT1172HVCQ#TRPBF is housed in a 5-lead DD (Q) package with exposed tab electrically connected to GND, optimized for thermal dissipation on PCB copper areas (θJA ≈ 25–45°C/W depending on layout).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN | Power Input | Accepts 3V–60V unregulated DC; internal LDO derives 2.3V bias rail for all circuitry. |
| VSW | Switch Drain Output | Connects to external inductor/diode; 75V-rated DMOS drain node capable of 1.25A peak current. |
| GND | Ground Reference | Primary signal and power return; tab is internally bonded to this pin for thermal conduction. |
| FB | Feedback Input | Senses output via resistor divider; pulls low to enter flyback mode (15–18V reference active). |
| VC | Error Amplifier Output / Control | Multi-function pin: compensation node, current limit setpoint, soft-start capacitor connection, and shutdown trigger (≤0.15V). |
Key Features
| Feature | Design Value |
|---|---|
| Flyback-regulated floating outputs | Enables transformer-isolated designs with no optocoupler or secondary-side feedback components. |
| Adaptive anti-saturation switch drive | Maintains high efficiency across 10:1 load range by dynamically adjusting gate drive to prevent MOSFET saturation. |
| External synchronization support | Allows noise-sensitive systems to lock switching frequency to external clock (120–160kHz), reducing EMI peaks. |
| Programmable current limit via VC pin | Permits precise overcurrent protection tuning using external clamp diodes or resistors - critical for short-circuit robustness. |
| Self-protected overload handling | Integrates thermal foldback and current limiting; no external protection circuitry required for most industrial transients. |
Applications
| Industrial Sensor Power Supply | Battery-Powered Instrumentation |
|---|---|
Use Scenario: Providing isolated ±15V rails for analog front-end amplifiers in explosion-proof process transmitters operating from 24V DC loop power. IC Role / Device Role / Timing Role: Primary controller in flyback topology; regulates secondary winding voltage via primary-side sensing at FB pin. Use Value: Eliminates need for optocoupler and TL431, reducing BOM count and improving long-term reliability in harsh environments. | Use Scenario: Generating –10V to –26V LCD contrast supply from a 3–20V Li-ion battery pack in portable test equipment. IC Role / Device Role / Timing Role: Inverting regulator with shutdown control; FB pin pulled low to activate flyback reference for negative output generation. Use Value: Achieves >82% efficiency at 100mA load while maintaining <50µA shutdown current - extends battery runtime by >30% vs linear solutions. |
| 48V Telecom Backup Converter | Isolated CAN Bus Power |
Use Scenario: Delivering 5V/2A auxiliary power from 48V telecom plant during AC failure, with reinforced isolation per IEC 60950. IC Role / Device Role / Timing Role: High-input-voltage flyback controller; leverages 75V switch rating and 60V absolute max VIN to withstand 48V + surge conditions. Use Value: Operates reliably at full load up to 85°C ambient without heatsink - validated per GR-63-CORE thermal requirements. | Use Scenario: Powering isolated CAN transceivers in automotive body control modules where ground potential differences exceed 10V. IC Role / Device Role / Timing Role: Dual-output flyback controller generating 5V for transceiver and 3.3V for microcontroller from vehicle battery (9–16V). Use Value: Fully floating outputs tolerate ±25V common-mode offset between domains - meets ISO 11898-2 immunity requirements. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar switching regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LT3573EDD#TRPBF | Higher 40V max input, integrated 1.5A switch, 2.2MHz switching, but no flyback reference mode. | Not suitable for transformer-isolated designs requiring primary-side regulation without optocoupler. | Select when high-frequency, low-inductor-size non-isolated DC/DC is needed - not a drop-in replacement. |
| UCC28C43DR | Current-mode PWM controller only (no integrated switch); requires external MOSFET; 30V max VDD. | Requires additional high-voltage switch and gate driver; lacks built-in flyback reference and shutdown current spec. | Choose for custom high-efficiency designs with >100V input or discrete switch optimization - adds complexity but improves thermal scalability. |
Compared with LT3573EDD#TRPBF and UCC28C43DR, the LT1172HVCQ#TRPBF uniquely combines HV-rated integration, flyback-specific regulation, and ultra-low shutdown current - making it optimal for cost-sensitive, space-constrained isolated supplies where simplicity and reliability outweigh raw efficiency gains.
Availability
LT1172HVCQ#TRPBF is available at Aetrix Electronics and suitable for industrial sensor power supplies, battery-powered instrumentation, 48V telecom backup converters, and isolated CAN bus power requiring stable component supply across extended temperature and voltage ranges.
Supply support for LT1172HVCQ#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 regulators.
The LT1172HVCQ#TRPBF belongs to the LT117x family of monolithic switching regulators designed specifically for rugged, high-voltage, multi-topology DC/DC conversion in industrial, telecom, and instrumentation applications - emphasizing integration, fault resilience, and ease of use.
FAQ
What is the maximum input voltage rating for the LT1172HVCQ#TRPBF?
The LT1172HVCQ#TRPBF has an absolute maximum supply voltage of 60V and a switch breakdown voltage of 75V. This HV grade variant is rated for continuous operation up to 60V input, with transient tolerance beyond that - distinguishing it from the standard LT1172 (40V max) and enabling use in 48V industrial and telecom systems. Always observe derating guidelines per AN19 for sustained high-voltage operation.
Does the LT1172HVCQ#TRPBF support flyback topology with primary-side regulation?
Yes, the LT1172HVCQ#TRPBF supports flyback topology with true primary-side regulation. Pulling the FB pin low activates a dedicated flyback error amplifier with 15.0–18.0V reference voltage, allowing regulation of output voltage via reflected flyback pulse amplitude - eliminating the need for optocouplers or secondary-side feedback components in the LT1172HVCQ#TRPBF design.
What is the purpose of the VC pin on the LT1172HVCQ#TRPBF?
The VC pin on the LT1172HVCQ#TRPBF serves four critical functions: (1) compensation node for loop stability, (2) current limit setpoint (0–2V maps to 0–1.25A), (3) soft-start control via external capacitor, and (4) shutdown activation when pulled ≤0.15V. This multi-function design reduces external component count and enables precise control of LT1172HVCQ#TRPBF dynamic behavior without additional ICs.
Can the LT1172HVCQ#TRPBF be synchronized to an external clock?
Yes, the LT1172HVCQ#TRPBF supports external synchronization from 120kHz to 160kHz by pulling the VC pin to ground with a narrow (<0.3µs) transistor-driven pulse. This feature allows EMI reduction in noise-sensitive systems and timing alignment with other switching stages - confirmed in the LT1172HVCQ#TRPBF datasheet Figure OP01/OP02 and Application Note AN19.
What thermal considerations apply to the LT1172HVCQ#TRPBF in the Q-package?
The LT1172HVCQ#TRPBF in the 5-lead DD (Q) package achieves θJA ≈ 25–45°C/W depending on PCB copper area (2.8 in² → 25°C/W; 0.2 in² → 45°C/W). Unlike SO or DIP packages, the Q-package's exposed tab must be soldered to a thermal pad with multiple vias to inner ground planes. Full-load thermal validation per AN19 is required - especially above 60°C ambient - due to its 100°C junction limit and lack of integrated thermal shutdown.
LT1172HVCQ#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:
- 1.25A (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
LT1172HVCQ#TRPBF FAQ
1.How can I place an order for LT1172HVCQ#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT1172HVCQ#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 LT1172HVCQ#TRPBF reliable?
The price and inventory of LT1172HVCQ#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT1172HVCQ#TRPBF is usually 5 days.
3.What payment methods are accepted for LT1172HVCQ#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT1172HVCQ#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT1172HVCQ#TRPBF?
LT1172HVCQ#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT1172HVCQ#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 LT1172HVCQ#TRPBF?
For technical support, including LT1172HVCQ#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT1172HVCQ#TRPBF requirements.
6.How does Aetrix verify that LT1172HVCQ#TRPBF is sourced from the original manufacturer or authorized distributors?
All LT1172HVCQ#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 LT1172HVCQ#TRPBF meets industry standards.
7.What is the process for return or replacement of LT1172HVCQ#TRPBF?
All LT1172HVCQ#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LT1172HVCQ#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 LT1172HVCQ#TRPBF part is unused and in its original packaging.
Return procedure for LT1172HVCQ#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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