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Analog Devices Inc. LT1170HVCT#PBF
- Part No.:
- LT1170HVCT#PBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- TO-220-5
- Datasheet:
-
LT1170HVCT#PBF.pdf
- Description:
- IC REG BUCK BOOST ADJ 5A TO220-5
- Quantity:
- Payment:
- Shipping:
Inventory:2,607
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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 in a 5-lead TO-220 package. It integrates a 75V breakdown-rated power switch, current-mode PWM controller, oscillator, error amplifier, and protection circuitry. Designed for buck, boost, flyback, inverting, and Cuk topologies, it delivers up to 100W output power with input voltage range 3V to 60V and quiescent current of 6mA - used in industrial DC-DC conversion where wide VIN and robust overload protection are required.
For engineers reviewing the LT1170HVCT#PBF datasheet, LT1170HVCT#PBF pinout, LT1170HVCT#PBF application, or LT1170HVCT#PBF equivalent, key selection criteria include its 75V switch breakdown rating, 5A internal switch current limit, flyback-regulated floating output capability, adaptive anti-saturation drive, and shutdown mode drawing only 50µA - all critical for high-reliability isolated and non-isolated power supply designs.
Technical Context
The LT1170HVCT#PBF implements current-mode control with a fixed 100kHz oscillator, enabling fast line and load transient response and simplified loop compensation. Its integrated 75V/5A switch uses adaptive anti-saturation drive to maintain efficiency across wide load-current ranges without external sensing resistors.
It supports dual regulation modes: standard feedback (1.24V reference at FB pin) and flyback-regulated mode (15V–18V reference, selectable via FB pin voltage), with internal blanking for leakage spike rejection. The VC pin serves as error amplifier output, current limit adjust, soft-start node, and shutdown control point.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Switch Breakdown Voltage | 75V - enables operation with up to 60V input in HV grade, supporting industrial and automotive battery-fed supplies. |
| Max Switch Current Limit | 5A - allows direct drive of high-power inductors without external MOSFETs in buck/boost/flyback converters up to ~100W. |
| Reference Voltage | 1.24V ±2% - precise internal bandgap reference sets output voltage accuracy in standard feedback configuration. |
| Quiescent Supply Current | 6mA - low operating current enables high efficiency at light loads and extends battery life in portable systems. |
| Shutdown Supply Current | 50µA - ultra-low standby draw supports energy-sensitive applications requiring long-term sleep modes. |
| Switching Frequency | 100kHz - fixed frequency simplifies EMI filtering and magnetics design while balancing size vs. efficiency trade-offs. |
| Flyback Reference Voltage | 15.0V to 18.0V - enables transformer-coupled isolated outputs without optocoupler feedback, supporting fully floating multiple-rail supplies. |
Pinout & Package
The LT1170HVCT#PBF is housed in a 5-lead plastic TO-220 package (T package) with tab connected to GND. Thermal resistance θJA = 75°C/W, θJC = 2°C/W. Pin 1 = VIN, Pin 2 = VSW, Pin 3 = GND, Pin 4 = FB, Pin 5 = VC.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN (Pin 1) | Main power input | Accepts 3V–60V DC; powers internal 2.3V regulator and switch driver; requires local bypass capacitor. |
| VSW (Pin 2) | Switch collector output | Drives external inductor/diode network; connects to primary side of flyback transformer or boost inductor; rated 75V breakdown. |
| GND (Pin 3) | Power and signal ground | Common return for internal circuits, switch emitter, and thermal tab; must be low-impedance connection for stability and thermal performance. |
| FB (Pin 4) | Feedback input | Compares output-derived voltage to 1.24V reference (standard mode) or selects flyback mode when pulled below 0.54V. |
| VC (Pin 5) | Error amplifier output / control node | Sets switch current limit via voltage (1V–2V range); enables soft-start (capacitor tie), shutdown (<0.15V), and frequency compensation. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated 75V/5A power switch | Eliminates need for external high-voltage MOSFETs in medium-power SMPS, reducing BOM count and layout complexity. |
| Current-mode PWM architecture | Provides inherent cycle-by-cycle current limiting, excellent line regulation, and simplified loop compensation across wide input/output ranges. |
| Flyback-regulated mode support | Enables optocoupler-free isolated DC-DC conversion by regulating flyback pulse amplitude relative to VIN, yielding fully floating outputs. |
| Adaptive anti-saturation switch drive | Maintains high efficiency over 0–5A load range by dynamically adjusting base/gate drive to prevent transistor saturation losses. |
| External shutdown with 50µA IQ | Allows system-level power sequencing and low-power sleep states without disabling upstream supplies or adding discrete enable circuitry. |
Applications
| Industrial DC-DC Conversion | Battery-Powered Upconverter |
|---|---|
Use Scenario: Converting 24V industrial bus to regulated 12V/5V rails for PLC I/O modules and sensors. IC Role / Device Role / Timing Role: Primary switching regulator controlling buck topology with internal 5A switch and 100kHz PWM timing. Use Value: Wide 3V–60V input range accommodates brownout and surge conditions; 75V switch rating ensures reliability under 48V transients. | Use Scenario: Boosting single-cell Li-ion (3.0–4.2V) to 12V for portable instrumentation displays. IC Role / Device Role / Timing Role: High-efficiency boost converter IC with adaptive anti-sat drive maintaining >88% efficiency across discharge curve. Use Value: 6mA quiescent current extends battery runtime; shutdown mode draws only 50µA during idle periods. |
| Floating Isolated Power Supply | High-Voltage Inverter Driver |
Use Scenario: Generating ±15V op-amp supplies from 24V rail in test equipment with galvanic isolation requirements. IC Role / Device Role / Timing Role: Flyback-regulated controller using transformer-coupled secondary windings and internal 15V–18V flyback reference. Use Value: Fully floating outputs eliminate ground loops; no optocoupler or secondary-side regulation IC needed. | Use Scenario: Driving gate of high-side IGBT in motor control inverters requiring +15V/-10V isolated gate bias. IC Role / Device Role / Timing Role: Dual-output inverting flyback controller delivering complementary rails with independent regulation. Use Value: Internal flyback mode supports asymmetric windings; 75V switch withstands inductive kickback during IGBT turn-off. |
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 |
|---|---|---|---|
| LTC3891EMSE#PBF | 40V max input, 2-phase synchronous buck controller, requires external MOSFETs; higher efficiency but more complex design. | Targeted at high-current, low-VOUT server/telecom rails; lacks integrated switch and flyback mode. | Select when >90% efficiency at 12V/10A is required and board space allows external FETs and dual-phase layout. |
| LM5088MHX/NOPB | 60V max input, 5A peak current limit, current-mode controller with integrated high-side switch; no flyback mode or 75V rating. | Optimized for buck-only industrial supplies; missing isolated topology support and HV-grade breakdown margin. | Choose for cost-sensitive buck regulators where flyback isolation and 75V margin are not required. |
Compared with LTC3891EMSE#PBF and LM5088MHX/NOPB, the LT1170HVCT#PBF uniquely combines 75V switch rating, integrated 5A switch, and flyback-regulated isolation in a single TO-220 package - making it optimal for compact, robust, multi-topology industrial power supplies where design simplicity and wide input tolerance are prioritized over peak efficiency.
Availability
LT1170HVCT#PBF is available at Aetrix Electronics and suitable for industrial DC-DC conversion, battery-powered upconverters, and floating isolated power supplies requiring stable component supply, long-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 and maintains full technical and supply-chain continuity for legacy Linear products including the LT1170 family.
The LT1170HVCT#PBF belongs to Linear's high-voltage monolithic switching regulator product line, designed specifically for rugged, low-component-count DC-DC conversion in industrial, military, and transportation systems demanding wide input range and topology flexibility.
FAQ
What is the maximum input voltage rating for the LT1170HVCT#PBF?
The LT1170HVCT#PBF 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 safe short-circuit tolerance depending on inductor DCR and duty cycle per AN19 guidelines. Operation beyond 60V violates Absolute Maximum Ratings and risks permanent damage.
Does the LT1170HVCT#PBF support flyback topology with isolated outputs?
Yes, the LT1170HVCT#PBF supports flyback-regulated mode by pulling the FB pin below 0.54V, activating an internal 15V–18V reference that regulates the flyback pulse amplitude relative to VIN. This enables fully floating, optocoupler-free isolated outputs - confirmed in the block diagram, electrical characteristics (VFB flyback spec), and typical application TA03.
What is the function of the VC pin on the LT1170HVCT#PBF?
The VC pin on the LT1170HVCT#PBF serves four functions: (1) error amplifier output for loop compensation, (2) current limit adjustment (1V–2V sets 0–5A limit), (3) soft-start node (capacitor tie), and (4) shutdown control (<0.15V forces 50µA standby). Its behavior is documented in the "Operation" section and Electrical Characteristics table (IVC, clamp voltages).
Can the LT1170HVCT#PBF be synchronized to an external clock?
Yes, the LT1170HVCT#PBF supports external synchronization between 120kHz and 160kHz by pulling the VC pin to ground with a narrow (<0.3µs) pulse via an external transistor, as shown in Figures OP01 and OP02. Synchronization shifts oscillator phase but does not alter internal 100kHz free-running frequency unless actively driven.
What thermal considerations apply to the LT1170HVCT#PBF in TO-220 package?
The LT1170HVCT#PBF in TO-220 (T package) has θJA = 75°C/W and θJC = 2°C/W. With tab connected to GND plane, it can dissipate ~1.3W at 100°C ambient before reaching 100°C junction limit. Full-load thermal performance depends on PCB copper area; AN19 provides dissipation formulas including switch RDS(on) and driver current contributions.
LT1170HVCT#PBF 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
LT1170HVCT#PBF FAQ
1.How can I place an order for LT1170HVCT#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT1170HVCT#PBF 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#PBF reliable?
The price and inventory of LT1170HVCT#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT1170HVCT#PBF is usually 5 days.
3.What payment methods are accepted for LT1170HVCT#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT1170HVCT#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT1170HVCT#PBF?
LT1170HVCT#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT1170HVCT#PBF 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#PBF?
For technical support, including LT1170HVCT#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT1170HVCT#PBF requirements.
6.How does Aetrix verify that LT1170HVCT#PBF is sourced from the original manufacturer or authorized distributors?
All LT1170HVCT#PBF 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#PBF meets industry standards.
7.What is the process for return or replacement of LT1170HVCT#PBF?
All LT1170HVCT#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LT1170HVCT#PBF, 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#PBF part is unused and in its original packaging.
Return procedure for LT1170HVCT#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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