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Analog Devices Inc. LT1170CT#06PBF
- Part No.:
- LT1170CT#06PBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- TO-220-5
- Datasheet:
-
LT1170CT#06PBF.pdf
- Description:
- IC REG BUCK BOOST ADJ 5A TO220-5
- Quantity:
- Payment:
- Shipping:
Inventory:1,530
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Product details
Overview
LT1170CT#PBF from Analog Devices (formerly Linear Technology) is a monolithic 5A, 100kHz current-mode switching regulator IC in a 5-lead plastic TO-220 package. It integrates a high-current power switch, oscillator, error amplifier, shutdown logic, and adaptive anti-saturation driver. With 3V–60V input range, 1.24V reference, and internal 5A switch, it delivers up to 100W in buck/boost/flyback topologies for industrial DC-DC conversion.
For engineers reviewing the LT1170CT#PBF datasheet, LT1170CT#PBF pinout, LT1170CT#PBF application, or LT1170CT#PBF equivalent, this page provides verified technical context, exact pin functions, real-world application cards, and two validated alternative parts with documented functional and application-level differences - all grounded in the official LT1170 family datasheet (117012fi).
Technical Context
The LT1170CT#PBF uses current-mode control: the internal 5A switch turns on at each 100kHz oscillator cycle and turns off when sensed current reaches a VC-pin-programmed threshold. Its adaptive anti-saturation driver dynamically adjusts base drive to minimize saturation voltage and enable fast turnoff.
It supports dual regulation modes: normal mode (FB pin referenced to 1.24V) and isolated flyback mode (FB pin pulled low to activate 15V flyback reference). E1 and E2 terminals are internally tied to GND in TO-220 packages, eliminating external emitter routing complexity.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Switch Current Rating | 5A continuous - enables ≥100W output in buck mode without external MOSFETs. |
| Input Voltage Range | 3V to 60V - supports wide-range industrial, automotive, and battery-fed systems. |
| Reference Voltage | 1.24V ±2% - precision feedback threshold enabling stable output regulation across temperature. |
| Quiescent Supply Current | 6mA typical - low standby draw enabling efficient operation at light loads. |
| Shutdown Current | 50µA typical - ultra-low power state activated by pulling VC ≤ 0.15V. |
| Switching Frequency | 100kHz nominal - fixed frequency simplifies EMI filtering and magnetics design. |
| Switch Breakdown Voltage | 65V (standard grade) - defines maximum safe VIN in non-HV variants during transients. |
Pinout & Package
LT1170CT#PBF is housed in a 5-lead plastic TO-220 package (T package), with the metal tab electrically connected to GND. Thermal resistance θJA = 75°C/W enables moderate-power operation without heatsink under controlled ambient conditions.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN | Power Input | Primary supply rail connection (3V–60V); feeds internal 2.3V regulator and switch source. |
| VSW | Switch Output | Drain of integrated 5A NPN power transistor; connects to external inductor/diode in all topologies. |
| GND | Ground Reference | Common return for internal circuitry, error amplifier, and VC pin; tab is bonded to this node. |
| FB | Feedback Input | Senses output via resistor divider; 1.24V threshold for normal mode, 15V for flyback mode. |
| VC | Error Amplifier Output / Control | Current-output node (gm = 3000–4400 µmho) used for compensation, soft-start, current limit, and shutdown. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated 5A Power Switch | Eliminates need for external high-current transistors in ≤100W converters, reducing BOM count and layout area. |
| Adaptive Anti-Saturation Drive | Dynamically optimizes base drive to minimize VCE(sat) and ensure fast, low-loss switch turnoff. |
| Flyback-Regulated Mode | Enables fully floating, transformer-isolated outputs with no optocoupler required - ideal for medical or safety-isolated supplies. |
| External Shutdown (50µA) | VC pin pulled ≤0.15V disables switching and reduces supply current to microamp level for battery-backed standby. |
| Wide Input Range (3V–60V) | Operates directly from 12V/24V/48V industrial rails or multi-cell Li-ion batteries without pre-regulation. |
Applications
| Buck DC-DC Converter | Boost Battery Upconverter |
|---|---|
|
Use Scenario: Step-down conversion from 24V industrial bus to regulated 5V/3.3V for PLC I/O modules. IC Role / Device Role / Timing Role: Primary controller managing switch duty cycle, current sensing, and feedback regulation in continuous conduction mode. Use Value: Delivers 5A load current with <1% line/load regulation using only 4 external components - no external current sense resistor needed. |
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 controller with adaptive anti-sat drive ensuring >90% efficiency across battery discharge curve. Use Value: Maintains stable 12V output down to 3.0V input while drawing only 6mA quiescent current - extends battery runtime. |
| Flyback Isolated Supply | Inverting Polarity Converter |
|
Use Scenario: Generating isolated ±15V op-amp rails from 24V input in test equipment with reinforced insulation requirements. IC Role / Device Role / Timing Role: Flyback mode controller regulating primary-side reflected voltage - eliminates optocoupler and secondary-side feedback. Use Value: Achieves <±2% output accuracy over temperature and line without secondary regulation, reducing component count and cost. |
Use Scenario: Converting +5V logic rail to –5V for analog sensor biasing in data acquisition systems. IC Role / Device Role / Timing Role: Inverting topology controller using single inductor and diode to generate negative output referenced to system ground. Use Value: Provides clean –5V at 1A with minimal ripple (<20mVpp) and no cross-regulation issues between positive/negative rails. |
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 |
|---|---|---|---|
| LT1171CT#PBF | 2.5A switch rating, higher RDS(on) (0.3Ω vs 0.15Ω), same pinout and package. | Lower max output power (~50W); suitable where thermal budget or peak current demand is reduced. | Select when 2.5A peak switch current suffices and lower dissipation at light loads is prioritized. |
| LM2596T-5.0/NOPB | Fixed 5V output, 3A switch, 150kHz frequency, no flyback mode, different pinout (TO-220-5 but non-compatible). | Not pin-compatible; requires redesign; lacks programmable feedback and isolation capability. | Choose only for simple, cost-sensitive 5V step-down where flyback, adjustable output, or >3A are unnecessary. |
Compared with LT1171CT#PBF, the LT1170CT#PBF delivers double the switch current and lower conduction loss, enabling higher-power designs in the same footprint; versus LM2596T-5.0/NOPB, it offers full configurability, isolation support, and 67% higher current capacity - at the cost of requiring external feedback resistors.
Availability
LT1170CT#PBF is available at Aetrix Electronics and suitable for industrial power supplies, battery-powered instrumentation, and embedded DC-DC conversion requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.
Supply support for LT1170CT#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, datasheets, and application engineering for legacy Linear parts including the LT1170 family.
The LT1170 series was designed as a rugged, self-contained switching regulator IC for high-reliability industrial and embedded systems - integrating power switch, control, and protection in standard TO-220/TO-3 packages to simplify high-power DC-DC design.
FAQ
What is the maximum continuous output power achievable with the LT1170CT#PBF?
The LT1170CT#PBF supports up to 100W in buck configuration (e.g., 20V input × 5A output), limited by its 5A internal switch and thermal performance in the TO-220 package. Actual power depends on input voltage, output voltage, ambient temperature, and heatsinking. At 60V input, maximum output current drops due to duty cycle constraints and thermal limits - refer to Figure TA02 in the datasheet for derating curves.
Does the LT1170CT#PBF require an external catch diode in boost topology?
Yes, the LT1170CT#PBF requires an external catch diode in boost, flyback, and inverting configurations. The internal switch is an NPN transistor; the diode provides the freewheeling path. For 5A operation, a Schottky diode like MBR330 (3A, 30V) or higher-rated part is recommended - the datasheet's Typical Application (TA01) shows MBR330 used with LT1170 in boost mode.
Can the LT1170CT#PBF be synchronized to an external clock?
Yes, the LT1170CT#PBF supports external synchronization between 120kHz and 160kHz by pulling the VC pin to ground with a narrow pulse (<0.3µs width) via an external transistor. This overrides the internal 100kHz oscillator. Synchronization is confirmed in the "LT1170/LT1171/LT1172 Synchronizing" section (page 10–11) of the datasheet, with circuit examples provided for bipolar and MOSFET drivers.
What is the function of the FB pin in flyback mode, and how is it enabled?
In flyback mode, the FB pin serves as the input to a dedicated flyback error amplifier with a 15V reference. It is enabled by pulling FB below 0.54V (typically with a resistor to ground), which disconnects the main error amplifier and routes the flyback amplifier output to the comparator. This allows regulation of reflected flyback pulses - critical for transformer-isolated supplies without optocouplers - as detailed on page 9 of the datasheet.
Is the LT1170CT#PBF pin-compatible with the LT1171CT#PBF or LT1172CT#PBF?
Yes, the LT1170CT#PBF, LT1171CT#PBF, and LT1172CT#PBF share identical 5-lead TO-220 pinouts (VIN, VSW, GND, FB, VC) and mounting footprint. They differ only in internal switch current rating (5A/2.5A/1.25A), on-resistance, and thermal characteristics - allowing direct substitution where lower current capability is acceptable, though output power and efficiency will scale accordingly.
LT1170CT#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):
- 40V
- Voltage - Output (Min/Fixed):
- 1.244V
- Voltage - Output (Max):
- 65V (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
LT1170CT#06PBF FAQ
1.How can I place an order for LT1170CT#06PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT1170CT#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 LT1170CT#06PBF reliable?
The price and inventory of LT1170CT#06PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT1170CT#06PBF is usually 5 days.
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LT1170CT#06PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT1170CT#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 LT1170CT#06PBF?
For technical support, including LT1170CT#06PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT1170CT#06PBF requirements.
6.How does Aetrix verify that LT1170CT#06PBF is sourced from the original manufacturer or authorized distributors?
All LT1170CT#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 LT1170CT#06PBF meets industry standards.
7.What is the process for return or replacement of LT1170CT#06PBF?
All LT1170CT#06PBF units undergo pre-shipment inspection (PSI). If there is an issue with LT1170CT#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 LT1170CT#06PBF part is unused and in its original packaging.
Return procedure for LT1170CT#06PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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