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Analog Devices Inc. LT1170HVCT#06PBF
- Part No.:
- LT1170HVCT#06PBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- TO-220-5
- Datasheet:
-
LT1170HVCT#06PBF.pdf
- Description:
- IC REG BUCK BOOST ADJ 5A TO220-5
- Quantity:
- Payment:
- Shipping:
Inventory:4,227
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Product details
Overview
LT1170HVCT#PBF from Analog Devices (formerly Linear Technology) is a monolithic 5A, 100kHz high-efficiency switching regulator IC with integrated power switch, designed for buck, boost, flyback, forward, inverting, and Cuk topologies. It operates from 3V to 60V input, delivers up to 100W output power without external switches, and features 6mA quiescent current, 75V switch breakdown voltage, and adaptive anti-saturation drive - used in industrial DC-DC conversion where wide VIN and rugged isolation are required.
For engineers reviewing the LT1170HVCT#PBF datasheet, LT1170HVCT#PBF pinout, LT1170HVCT#PBF application, or LT1170HVCT#PBF equivalent, key selection criteria include its HV-grade 75V switch rating, TO-220-5 package thermal performance (θJA = 75°C/W), flyback-regulated floating output capability, and shutdown mode drawing only 50µA - critical for battery-powered or high-reliability off-line supplies.
Technical Context
The LT1170HVCT#PBF implements current-mode control with a 100kHz fixed-frequency oscillator, enabling fast line/load transient response and simplified loop compensation. Its internal 5A/75V DMOS switch integrates adaptive anti-saturation drive to maintain efficiency across wide load ranges without external gate drivers.
It supports dual regulation modes: normal mode (1.24V feedback reference) and flyback mode (15V–18V programmable reference via FB pin pull-down), with dedicated flyback blanking time (1.5µs) to reject transformer leakage spikes - essential for stable isolated output regulation without optocoupler feedback.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Switch Current Rating | 5A continuous - enables single-chip 100W buck/boost designs without external MOSFETs |
| Input Voltage Range | 3V to 60V - supports wide-range industrial, automotive, and telecom inputs |
| Switch Breakdown Voltage | 75V - HV grade allows safe operation in 48V systems with surge margin |
| Quiescent Supply Current | 6mA - minimizes no-load power loss in always-on applications |
| Shutdown Current | 50µA - enables ultra-low-power standby in battery backup systems |
| Switching Frequency | 100kHz typical - balances EMI, magnetics size, and efficiency for medium-power converters |
| Reference Voltage | 1.24V ±2% - precision feedback threshold for accurate output regulation |
Pinout & Package
LT1170HVCT#PBF is housed in a 5-lead plastic TO-220 package (T package) with tab connected to GND. Thermal resistance is θJC = 2°C/W and θJA = 75°C/W, enabling high-power operation without heatsink in moderate ambient conditions.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN | Power Input | Primary supply input (3V–60V); connects to input capacitor and EMI filter |
| VSW | Switch Output | Drains internal 5A/75V DMOS switch; connects to inductor/diode in buck/boost/flyback |
| GND | Ground Reference | Power and signal ground; tab is electrically connected to this pin |
| FB | Feedback Input | Senses output voltage divider; pulls low to enable flyback regulation mode |
| VC | Error Amplifier Output | Provides transconductance error signal; used for compensation, soft-start, and shutdown control |
Key Features
| Feature | Design Value |
|---|---|
| Flyback-regulated floating outputs | Enables fully isolated multiple-output supplies without optocouplers or secondary-side sensing |
| Adaptive anti-saturation switch drive | Maintains high efficiency across 0–5A load range by dynamically optimizing gate drive strength |
| External synchronization support | Accepts 120–160kHz sync pulses on VC pin to eliminate beat frequencies in multi-regulator systems |
| Self-protected overload handling | Includes cycle-by-cycle current limiting, thermal foldback, and "bust-proof" operation under short-circuit |
| Wide topology compatibility | Operates in buck, boost, flyback, forward, inverting, and Cuk configurations with minimal external components |
Applications
| Industrial Power Supplies | Isolated Telecom DC-DC |
|---|---|
Use Scenario: Converting 24V or 48V rail to 5V/12V for PLC I/O modules and sensor interfaces in harsh factory environments. IC Role / Device Role / Timing Role: Primary controller in non-isolated buck configuration; regulates output using internal 5A switch and 1.24V reference. Use Value: Eliminates need for external high-current MOSFETs and reduces BOM count by >40% versus discrete controllers. | Use Scenario: Generating isolated ±15V op-amp rails and 5V logic supply from a 48V telecom backplane with no optocoupler. IC Role / Device Role / Timing Role: Flyback controller with FB pin pulled low; regulates primary-side reflected voltage to achieve tight cross-regulation. Use Value: Achieves <±3% cross-regulation across three outputs using only one transformer winding and no secondary feedback. |
| Battery Upconverter Systems | High-Voltage LCD Bias Supply |
Use Scenario: Boosting 3.3V–20V Li-ion or lead-acid battery voltage to 24V for motor drivers or solenoid actuation. IC Role / Device Role / Timing Role: High-efficiency boost converter controller; leverages 75V switch rating to handle battery overvoltage and load dump transients. Use Value: Sustains 5A peak switch current at 90% duty cycle, enabling >92% efficiency even at 15V→24V conversion. | Use Scenario: Generating –10V to –26V negative bias for LCD contrast control in portable medical displays. IC Role / Device Role / Timing Role: Inverting regulator with VC pin clamped for soft-start and controlled current limit during display initialization. Use Value: Delivers precise, ripple-free negative output with <10mV drift over temperature using internal bandgap reference. |
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 |
|---|---|---|---|
| LT1170CT#PBF | Standard 65V switch breakdown (vs. 75V HV grade); identical pinout, package, and functionality | Not suitable for 48V systems with >10V transients; limited to ≤40V max input | Select LT1170HVCT#PBF when operating above 40V or requiring surge immunity per IEC 61000-4-5 Level 3 |
| LM2596T-5.0/NOPB | Fixed 5V output, 3A rating, 150kHz switching; no flyback mode or external sync capability | Only supports non-isolated buck; lacks programmable regulation modes and HV tolerance | Choose LM2596T-5.0/NOPB only for cost-sensitive, fixed-output, low-power (<15W) buck applications |
Compared with LT1170CT#PBF, the LT1170HVCT#PBF adds 10V switch breakdown margin critical for 48V industrial surges; versus LM2596T-5.0/NOPB, it provides full topology flexibility, higher current, and isolation-ready flyback control - making it the sole choice for rugged, multi-topology, medium-power DC-DC design.
Availability
LT1170HVCT#PBF is available at Aetrix Electronics and suitable for industrial power supplies, isolated telecom DC-DC converters, and battery upconverter systems requiring stable component supply, long-term lifecycle support, and traceable sourcing.
Supply support for LT1170HVCT#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) is a global leader in high-performance analog, mixed-signal, and power management semiconductors.
The LT1170HVCT#PBF belongs to the LT1170/LT1171/LT1172 family of monolithic switching regulators, engineered for high-power, wide-input-voltage DC-DC conversion in industrial, telecom, and instrumentation applications where integration, reliability, and topology flexibility are essential.
FAQ
What is the maximum input voltage rating for the LT1170HVCT#PBF?
The LT1170HVCT#PBF has an absolute maximum supply voltage rating of 60V and a switch breakdown voltage of 75V. This HV grade allows reliable operation in 48V systems with transient surges up to 60V, unlike the standard LT1170CT#PBF rated for 40V max input. Always observe derating guidelines per AN19 for sustained operation near limits.
Can the LT1170HVCT#PBF be used in flyback topology without an optocoupler?
Yes, the LT1170HVCT#PBF supports flyback-regulated mode by pulling the FB pin low with an external resistor. In this mode, it regulates the amplitude of the reflected flyback pulse relative to VIN, enabling fully floating, optocoupler-free isolated outputs with tight cross-regulation - confirmed in Typical Application TA03 and Block Diagram on page 8 of the datasheet.
What is the thermal performance of the LT1170HVCT#PBF in TO-220 package?
The LT1170HVCT#PBF in TO-220 (T package) has θJC = 2°C/W and θJA = 75°C/W. With 100W capability and 6mA quiescent current, it can operate without a heatsink up to ~60°C ambient at full load in well-ventilated PCB layouts. Derating curves and dissipation formulas are provided in Application Note AN19 for precise thermal modeling.
Does the LT1170HVCT#PBF support external frequency synchronization?
Yes, the LT1170HVCT#PBF accepts external sync pulses in the 120kHz–160kHz range applied to the VC pin via an NPN or NMOS transistor. Pulse width must be ≤0.3µs to avoid disturbing error amplifier DC operation. Sync capability eliminates beat frequencies in multi-rail systems and improves EMI profile - detailed in pages 10–11 of the datasheet.
How does the adaptive anti-saturation drive improve efficiency in the LT1170HVCT#PBF?
The LT1170HVCT#PBF uses adaptive anti-saturation drive to dynamically adjust gate current based on load, minimizing switch conduction losses across 0–5A. Unlike fixed-drive controllers, this prevents excessive gate dissipation at light loads while ensuring fast turn-off at full load - maintaining >90% efficiency from 10% to 100% load in typical buck configurations per Figure G03 and G08.
LT1170HVCT#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:
- 5A (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
LT1170HVCT#06PBF FAQ
1.How can I place an order for LT1170HVCT#06PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT1170HVCT#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 LT1170HVCT#06PBF reliable?
The price and inventory of LT1170HVCT#06PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT1170HVCT#06PBF is usually 5 days.
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Once your LT1170HVCT#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 LT1170HVCT#06PBF?
For technical support, including LT1170HVCT#06PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT1170HVCT#06PBF requirements.
6.How does Aetrix verify that LT1170HVCT#06PBF is sourced from the original manufacturer or authorized distributors?
All LT1170HVCT#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 LT1170HVCT#06PBF meets industry standards.
7.What is the process for return or replacement of LT1170HVCT#06PBF?
All LT1170HVCT#06PBF units undergo pre-shipment inspection (PSI). If there is an issue with LT1170HVCT#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 LT1170HVCT#06PBF part is unused and in its original packaging.
Return procedure for LT1170HVCT#06PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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