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Analog Devices Inc. LT1172HVCT#06PBF
- Part No.:
- LT1172HVCT#06PBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- TO-220-5
- Datasheet:
-
LT1172HVCT#06PBF.pdf
- Description:
- IC REG BCK BST ADJ 1.25A TO220-5
- Quantity:
- Payment:
- Shipping:
Inventory:2,204
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Product details
Overview
LT1172HVCT#06PBF from Analog Devices (formerly Linear Technology) is a high-voltage monolithic 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 current-mode control, 6mA quiescent current, and shutdown mode drawing only 50µA. Used in industrial power supplies requiring wide-input, isolated DC-DC conversion.
For engineers reviewing the LT1172HVCT#06PBF datasheet, LT1172HVCT#06PBF pinout, LT1172HVCT#06PBF application, or LT1172HVCT#06PBF equivalent, key selection criteria include its HV-rated 75V switch breakdown voltage, TO-220-5 package thermal performance (θJA = 75°C/W), flyback-regulated floating output capability, and adaptive anti-saturation drive for stable operation across 1.25A–3.5A load range.
Technical Context
The LT1172HVCT#06PBF implements current-mode switching with internal 100kHz oscillator and adaptive anti-saturation gate drive, enabling precise pulse-by-pulse current limiting and fast transient response. Its dual error amplifier architecture supports both standard regulation (1.24V FB reference) and isolated flyback mode (15V–18V programmable reference).
It operates in all major topologies-buck, boost, flyback, forward, inverting, and Cuk-with external component count minimized by integrating switch, oscillator, control logic, and protection circuitry. The VC pin serves as combined compensation node, soft-start input, current limit adjust, and shutdown control interface.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 3V to 60V - supports wide-range industrial, automotive, and battery-derived inputs without pre-regulation. |
| Switch Breakdown Voltage | 75V - enables safe operation with 60V input in flyback or boost configurations under transients. |
| Max Switch Current | 1.25A (TJ ≥ 25°C) - defines maximum continuous output power in buck mode (~15W at 12V out) and peak capability in flyback. |
| Quiescent Current | 6mA - ensures low no-load power loss in always-on systems like remote sensors or standby rails. |
| Shutdown Current | 50µA - allows ultra-low-power sleep states in battery-powered applications. |
| Switching Frequency | 100kHz (±12kHz) - balances EMI, inductor size, and efficiency for medium-power DC-DC designs. |
| Reference Voltage | 1.244V (±20mV) - provides stable feedback threshold for accurate output voltage regulation. |
| Flyback Reference | 15.0V to 18.0V - enables direct regulation of transformer-coupled outputs without optocoupler feedback. |
Pinout & Package
LT1172HVCT#06PBF is housed in a 5-lead plastic TO-220 package (T package) with tab connected to GND. Thermal resistance θJA = 75°C/W enables operation up to 100°C ambient without heatsink in typical 15W applications.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN | Power Input | Primary supply input (3V–60V); connects to bulk capacitor and input filter. |
| VSW | Switch Output | Drains internal NPN power transistor; connects to inductor/diode in buck or primary winding in flyback. |
| GND | Ground Reference | Power and signal ground; tab is electrically tied to this pin for thermal conduction. |
| FB | Feedback Input | Senses output voltage divider; pulls low to enable flyback regulation mode (15V–18V reference). |
| VC | Error Amplifier Output | Provides compensation node, soft-start control, current limit adjustment, and shutdown activation (≤0.15V). |
Key Features
| Feature | Design Value |
|---|---|
| Integrated 1.25A, 75V switch | Eliminates external MOSFET in ≤25W designs, reducing BOM count and layout complexity. |
| Current-mode control | Enables inherent cycle-by-cycle current limiting and stable operation across wide VIN/VOUT ranges. |
| Flyback-regulated mode | Supports fully floating, transformer-isolated outputs without optocoupler or secondary-side sensing. |
| Adaptive anti-saturation drive | Maintains optimal switch turn-off speed across load and temperature, minimizing switching losses. |
| External synchronization support | Accepts 120–160kHz sync pulses on VC pin for EMI reduction in noise-sensitive systems. |
| Shutdown with 50µA IQ | Enables deep sleep in portable or energy-harvesting applications without auxiliary LDO. |
Applications
| Industrial Power Supply | Battery-Powered Instrumentation |
|---|---|
Use Scenario: 24V AC/DC input converted to isolated ±15V op-amp rails in PLC I/O modules. IC Role / Device Role / Timing Role: Primary-side controller in flyback topology regulating dual floating outputs via transformer turns ratio. Use Value: Eliminates optocoupler and TL431, reducing component count by 4 parts while maintaining <±2% output regulation over line/load/temp. | Use Scenario: 9V alkaline battery boosted to 12V for sensor excitation in handheld test equipment. IC Role / Device Role / Timing Role: Boost converter controller with shutdown-controlled duty cycling to extend battery life. Use Value: Delivers 12V @ 150mA with >82% efficiency at 50% load and reduces standby drain to 50µA during idle periods. |
| Medical Isolated Sensor Interface | Legacy System Voltage Translation |
Use Scenario: Isolating analog front-end signals in patient-connected ECG monitors using reinforced insulation. IC Role / Device Role / Timing Role: Flyback controller powering isolated ADC and instrumentation amplifier rails with 5kV RMS creepage clearance. Use Value: Achieves Class II isolation compliance with single-transformer design and no secondary-side feedback components. | Use Scenario: Converting legacy 5V logic rails to ±12V for analog multiplexers in retrofitted industrial controllers. IC Role / Device Role / Timing Role: Inverting buck-boost regulator generating negative output from positive input without split supply. Use Value: Provides –12V @ 200mA with <100mV ripple and eliminates need for dual-output transformer or charge pump IC. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar switching regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTC3873EMS#TRPBF | External MOSFET driver; 3.5V–60V input; no integrated switch; requires external FETs and sense resistor. | Higher efficiency (>92%) at >30W; supports phase interleaving and digital monitoring. | Select when >25W output or precise current sharing across multiple phases is required. |
| LM5017MM/NOPB | 75V max input; integrated 100mA FET; fixed 600kHz frequency; requires external bootstrap diode. | Optimized for compact flyback designs <10W; lower quiescent current (1.5mA) but limited output current. | Select for space-constrained, low-power isolated supplies where footprint and light-load efficiency dominate. |
Compared with LTC3873EMS#TRPBF and LM5017MM/NOPB, the LT1172HVCT#06PBF offers unique integration of 1.25A/75V switch and flyback reference in a TO-220 package, making it ideal for cost-sensitive, medium-power isolated converters where minimal external parts and proven reliability outweigh programmability or ultra-high efficiency.
Availability
LT1172HVCT#06PBF is available at Aetrix Electronics and suitable for industrial power supplies, battery-backed instrumentation, medical sensor interfaces, and legacy system upgrades requiring stable component supply and long-term obsolescence management.
Supply support for LT1172HVCT#06PBF 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 technical and manufacturing continuity for legacy Linear products including the LT117x family.
The LT117x series was designed for rugged, high-power monolithic switching regulators targeting industrial, aerospace, and medical applications where wide input range, integrated protection, and topology flexibility are critical.
FAQ
What is the maximum safe input voltage for LT1172HVCT#06PBF in flyback mode?
The LT1172HVCT#06PBF supports up to 55V input in fully isolated flyback mode per datasheet Note 5, due to switch breakdown margin constraints. At 60V input, risk of VSW exceeding 75V rating increases during leakage spike events. For 60V operation, use snubber networks and ensure transformer turns ratio limits reflected voltage to ≤65V at the switch node. Always verify worst-case VSW with oscilloscope during validation testing of LT1172HVCT#06PBF.
Can LT1172HVCT#06PBF be used in boost configuration with 5V input to generate 24V output?
Yes, LT1172HVCT#06PBF supports boost topology with 5V input to 24V output. With 1.25A switch current limit and 100kHz frequency, it delivers ~1.1A at 24V (26W) assuming 85% efficiency. Use a 47µH inductor, 100V Schottky catch diode (e.g., MBR20100), and 470µF output capacitor. Ensure minimum off-time constraint is met: D = 1 − VIN/VOUT = 0.79, well within 97% max duty cycle. Confirm thermal rise stays below 100°C ambient using θJA = 75°C/W in LT1172HVCT#06PBF's TO-220 package.
How does the flyback regulation mode work on LT1172HVCT#06PBF?
LT1172HVCT#06PBF enters flyback mode when FB pin voltage drops below 0.45V (typical), disconnecting the main error amplifier and enabling the flyback amplifier with 15V–18V reference. This allows direct regulation of the reflected flyback pulse amplitude instead of output voltage, enabling fully floating outputs. The internal blanking time (1.5µs) suppresses leakage spikes. No optocoupler or secondary-side sensing is needed - regulation accuracy depends on transformer turns ratio and primary-side RFB divider tolerance. Full details are in LT1172HVCT#06PBF datasheet Section "Operation".
What is the purpose of the VC pin on LT1172HVCT#06PBF beyond compensation?
The VC pin on LT1172HVCT#06PBF serves four distinct functions: (1) compensation node for loop stability, (2) soft-start control via capacitor ramp, (3) current limit adjustment by clamping voltage (0V–2V sets 0A–2A limit), and (4) shutdown activation when pulled ≤0.15V (reducing IQ to 50µA). Unlike generic error amp outputs, VC directly modulates switch current trip level in real time. This multi-function capability eliminates external DACs or logic gates in many designs using LT1172HVCT#06PBF.
Is LT1172HVCT#06PBF RoHS-compliant and lead-free?
Yes, LT1172HVCT#06PBF is RoHS-compliant and features lead-free finish (Pb-free), as indicated by the "#PBF" suffix per Linear Technology's marking standard. It meets JEDEC J-STD-020 moisture sensitivity level 3 (MSL3) and is qualified for reflow soldering per IPC/JEDEC J-STD-020. The device is manufactured with NiPdAu lead finish and complies with EU RoHS Directive 2011/65/EU and China RoHS. Full compliance documentation is available for LT1172HVCT#06PBF upon request from Aetrix Electronics.
LT1172HVCT#06PBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- TO-220-5
- Packaging:
- Tube
- 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:
- Through Hole
- Supplier Device Package:
- TO-220-5 Flow 6
LT1172HVCT#06PBF FAQ
1.How can I place an order for LT1172HVCT#06PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT1172HVCT#06PBF 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 LT1172HVCT#06PBF reliable?
The price and inventory of LT1172HVCT#06PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT1172HVCT#06PBF is usually 5 days.
3.What payment methods are accepted for LT1172HVCT#06PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT1172HVCT#06PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT1172HVCT#06PBF?
LT1172HVCT#06PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT1172HVCT#06PBF 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 LT1172HVCT#06PBF?
For technical support, including LT1172HVCT#06PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT1172HVCT#06PBF requirements.
6.How does Aetrix verify that LT1172HVCT#06PBF is sourced from the original manufacturer or authorized distributors?
All LT1172HVCT#06PBF 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 LT1172HVCT#06PBF meets industry standards.
7.What is the process for return or replacement of LT1172HVCT#06PBF?
All LT1172HVCT#06PBF units undergo pre-shipment inspection (PSI). If there is an issue with LT1172HVCT#06PBF, 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 LT1172HVCT#06PBF part is unused and in its original packaging.
Return procedure for LT1172HVCT#06PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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