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Analog Devices Inc. LT1170HVIT#31PBF
- Part No.:
- LT1170HVIT#31PBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- TO-220-5 Formed Leads
- Datasheet:
-
LT1170HVIT#31PBF.pdf
- Description:
- IC REG BUCK BOOST ADJ 5A TO220-5
- Quantity:
- Payment:
- Shipping:
Inventory:899
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Product details
Overview
LT1170HVIT#PBF from Analog Devices (formerly Linear Technology) is a monolithic 5A, 100kHz high-efficiency switching regulator IC in a 5-lead TO-220 package, featuring an integrated 75V breakdown switch, 3V–60V input range, and flyback/boost/buck operation. It delivers up to 100W output power without external power devices and supports isolated flyback-regulated topologies with fully floating outputs.
For engineers reviewing the LT1170HVIT#PBF datasheet, LT1170HVIT#PBF pinout, LT1170HVIT#PBF application, or LT1170HVIT#PBF equivalent, key selection criteria include its HV-grade 75V switch breakdown voltage, –40°C to 100°C operating junction temperature, adaptive anti-saturation drive, and shutdown mode drawing only 50µA supply current.
Technical Context
The LT1170HVIT#PBF implements current-mode control with a fixed 100kHz oscillator, enabling fast line/load transient response and simplified loop compensation. Its internal 5A/75V DMOS switch integrates adaptive anti-saturation drive for wide load-current efficiency retention and pulse-by-pulse current limiting.
It features dual error amplifiers - one for standard regulation (1.24V reference), another for flyback mode (15V–18V reference) - selectable via feedback pin voltage threshold. The VC pin serves as combined error amplifier output, soft-start node, current limit adjust, and shutdown control interface.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Switch Current Limit | 5A typical at 50% duty cycle; enables ≥100W buck/boost operation without external MOSFETs |
| Switch Breakdown Voltage | 75V (HV grade); supports up to 55V input in isolated flyback mode without risk of switch avalanche |
| Input Voltage Range | 3V to 60V; accommodates wide industrial, automotive, and battery-derived supplies |
| Quiescent Supply Current | 6mA typical; ensures low standby loss in always-on systems |
| Shutdown Current | 50µA typical; enables ultra-low-power sleep states in portable or energy-sensitive designs |
| Reference Voltage | 1.24V ±20mV; provides stable feedback threshold for precise output regulation |
| Switching Frequency | 100kHz nominal; balances EMI, inductor size, and efficiency for medium-power DC/DC conversion |
Pinout & Package
LT1170HVIT#PBF uses a 5-lead plastic TO-220 package (T package) with tab connected to GND. Thermal resistance θJA = 75°C/W, θJC = 2°C/W; suitable for moderate-power applications without heatsink under proper PCB copper layout.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN | Power Input | Accepts 3V–60V unregulated input; connects to bulk capacitor and input filter |
| VSW | Switch Output | Drives external inductor/diode network; carries full switch current and high dv/dt |
| GND | Ground Reference | Common return for control circuitry, feedback, and power ground; tab is electrically tied to this pin |
| FB | Feedback Input | Senses output voltage divider; <0.5V selects flyback mode; 1.24V sets regulation point in standard mode |
| VC | Error Amplifier Output | Controls switch current limit; clamping below 1V reduces peak current; pulled to GND for shutdown |
Key Features
| Feature | Design Value |
|---|---|
| Integrated 5A/75V Power Switch | Eliminates need for external high-current MOSFETs and gate drivers in ≤100W converters |
| Flyback-Regulated Mode | Enables transformer-isolated outputs with no optocoupler required; reference shifts to 15–18V for direct primary-side sensing |
| Adaptive Anti-Saturation Drive | Maintains high efficiency across 0.1A–5A load range by dynamically adjusting driver strength to prevent switch saturation |
| External Shutdown Control | VC pin pulled below 0.15V reduces supply current to 50µA, enabling system-level power sequencing and low-power sleep |
| Multi-Topology Support | Operates in buck, boost, flyback, forward, inverting, and Cuk configurations using same IC and minimal external parts |
Applications
| Industrial Power Supplies | Battery-Powered Upconverters |
|---|---|
Use Scenario: 24V industrial rail powering 12V logic and 5V microcontroller subsystems with variable load demand. IC Role / Device Role / Timing Role: Primary switching regulator in non-isolated buck configuration, delivering 5A continuous output with tight line regulation. Use Value: Single-chip solution eliminates discrete switch + controller complexity; 6mA quiescent current extends uptime in brownout conditions. | Use Scenario: Portable test equipment requiring 12V from a 3.6V Li-ion battery pack during active measurement cycles. IC Role / Device Role / Timing Role: Boost converter core regulating 12V output while supporting >2A peak loads during sensor excitation. Use Value: 5A switch and 100kHz frequency enable compact inductor sizing; HV rating allows safe operation even at battery end-of-discharge (≈2.8V). |
| Floating Isolated Flyback Supplies | High-Voltage LCD Bias Generators |
Use Scenario: Medical sensor module needing isolated ±15V analog supplies referenced to patient-connected circuits. IC Role / Device Role / Timing Role: Flyback-regulated controller using primary-side sensing; FB pin configured for 15V reference to regulate secondary windings. Use Value: Eliminates optocoupler and TL431, reducing BOM count and improving long-term reliability; 75V switch withstands reflected transients. | Use Scenario: Industrial HMI display requiring programmable –10V to –26V contrast voltage from a 5V logic rail. IC Role / Device Role / Timing Role: Inverting converter generating negative bias; VC pin used for soft-start to avoid display flicker during power-up. Use Value: Integrated current limit prevents damage during panel short-circuits; –40°C to 100°C rating ensures operation in harsh factory environments. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar high-current switching regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTC3703-5 | External N-channel MOSFET driver; no integrated switch; 5A max output via external FETs | Requires gate driver, sense resistors, and discrete power switches; better thermal scalability but higher BOM count | Choose when >100W output, custom topology, or enhanced thermal management is required |
| LM5085MHX/NOPB | 55V max input; 5A current limit; no flyback mode; requires external compensation | Lacks flyback regulation capability and adaptive anti-sat; limited to non-isolated topologies | Choose for cost-sensitive buck/boost designs where isolation and ultra-wide Vin are not needed |
Compared with LTC3703-5 and LM5085MHX/NOPB, the LT1170HVIT#PBF uniquely combines integrated 5A/75V switching, flyback regulation, and –40°C to 100°C operation in a single TO-220 package-enabling robust, compact, and isolated power solutions without external high-voltage components.
Availability
LT1170HVIT#PBF is available at Aetrix Electronics and suitable for industrial power supplies, battery-powered upconverters, isolated flyback supplies, and high-voltage LCD bias generators requiring stable component supply across extended temperature ranges.
Supply support for LT1170HVIT#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 full product support, documentation, and manufacturing continuity for legacy Linear parts including the LT1170 family.
The LT1170 series was designed as a monolithic high-power switching regulator platform targeting medium-power DC/DC conversion in industrial, medical, and instrumentation applications where integration, ruggedness, and multi-topology flexibility are critical.
FAQ
What is the maximum input voltage supported by the LT1170HVIT#PBF?
The LT1170HVIT#PBF supports a maximum supply voltage of 60V per Absolute Maximum Ratings. Its HV-grade switch has a 75V breakdown rating, allowing safe operation up to 55V in fully isolated flyback mode to maintain margin against reflected voltage spikes. Operation beyond 60V risks permanent device damage and is strictly prohibited.
Does the LT1170HVIT#PBF support flyback topology with primary-side regulation?
Yes, the LT1170HVIT#PBF supports flyback-regulated mode via its dual-error-amplifier architecture. Pulling the FB pin below 0.5V activates the flyback amplifier with a 15V–18V reference, enabling accurate primary-side output regulation without optocouplers or secondary-side feedback components - a confirmed feature documented in the LT1170/LT1171/LT1172 datasheet Section "Operation".
What is the thermal performance of the LT1170HVIT#PBF in TO-220 package?
The LT1170HVIT#PBF in T-package (5-lead plastic TO-220) has θJA = 75°C/W and θJC = 2°C/W. With 2.8 sq. in. of 1 oz. copper on the PCB, junction-to-ambient rise is ~56°C at 1W dissipation. Full 100W output requires careful thermal design; the part is rated for continuous operation up to 100°C junction temperature, validated across its –40°C to 100°C operating range.
Can the LT1170HVIT#PBF be synchronized to an external clock?
Yes, the LT1170HVIT#PBF supports external synchronization between 120kHz and 160kHz by pulling the VC pin to ground with a narrow (<0.3µs) transistor-driven pulse. This function is explicitly verified in the datasheet's "Synchronizing" section and enables EMI reduction and multi-regulator phase alignment in complex power systems.
How does the adaptive anti-saturation drive improve efficiency in the LT1170HVIT#PBF?
The adaptive anti-saturation drive in the LT1170HVIT#PBF monitors switch conduction and dynamically adjusts gate drive strength to prevent deep saturation of the internal DMOS transistor. This minimizes VCE(sat) and switching losses across the full 0.1A–5A load range - a confirmed mechanism described in the "Operation" section that sustains >85% efficiency from light to full load without external compensation.
LT1170HVIT#31PBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- TO-220-5 Formed Leads
- 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:
- 5A (Switch)
- Frequency - Switching:
- 100kHz
- Synchronous Rectifier:
- No
- Operating Temperature:
- -40°C ~ 100°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- TO-220-5 Flow 31
LT1170HVIT#31PBF FAQ
1.How can I place an order for LT1170HVIT#31PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT1170HVIT#31PBF 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 LT1170HVIT#31PBF reliable?
The price and inventory of LT1170HVIT#31PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT1170HVIT#31PBF is usually 5 days.
3.What payment methods are accepted for LT1170HVIT#31PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT1170HVIT#31PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT1170HVIT#31PBF?
LT1170HVIT#31PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT1170HVIT#31PBF 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 LT1170HVIT#31PBF?
For technical support, including LT1170HVIT#31PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT1170HVIT#31PBF requirements.
6.How does Aetrix verify that LT1170HVIT#31PBF is sourced from the original manufacturer or authorized distributors?
All LT1170HVIT#31PBF 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 LT1170HVIT#31PBF meets industry standards.
7.What is the process for return or replacement of LT1170HVIT#31PBF?
All LT1170HVIT#31PBF units undergo pre-shipment inspection (PSI). If there is an issue with LT1170HVIT#31PBF, 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 LT1170HVIT#31PBF part is unused and in its original packaging.
Return procedure for LT1170HVIT#31PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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