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Analog Devices Inc. LT1070CT#06PBF
- Part No.:
- LT1070CT#06PBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- TO-220-5
- Datasheet:
-
LT1070CT#06PBF.pdf
- Description:
- IC REG BUCK BOOST ADJ 5A TO220-5
- Quantity:
- Payment:
- Shipping:
Inventory:4,111
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Product details
Overview
LT1070CT#06PBF from Analog Devices (formerly Linear Technology) is a monolithic 5A high-efficiency current-mode switching regulator IC in a 5-pin TO-220 package. It operates across 3V–60V input, delivers up to 100W output power without external switches, and supports buck, boost, flyback, forward, inverting, and Cuk topologies. It integrates a 5A internal switch, oscillator, control logic, and protection circuitry - enabling robust, "bust-proof" operation in industrial power supplies and off-line converters.
For engineers reviewing the LT1070CT#06PBF datasheet, LT1070CT#06PBF pinout, LT1070CT#06PBF application, or LT1070CT#06PBF equivalent, key selection criteria include its 40kHz fixed switching frequency, 5A switch current limit, 6mA quiescent current, flyback regulation mode for isolated outputs, and shutdown capability drawing only 50µA.
Technical Context
The LT1070CT#06PBF uses current-mode control: switch duty cycle is directly set by sensed switch current rather than output voltage feedback, delivering fast line transient response and simplified loop compensation. Its adaptive antisaturation driver dynamically adjusts gate drive to minimize saturation losses across wide load ranges.
It features dual error amplifier paths - a standard feedback amplifier (1.244V reference) and a dedicated flyback amplifier (16.3V typical flyback reference) activated when the FB pin is pulled below 0.45V. The VC pin serves four functions: compensation node, current limit adjustment, soft-start control, and shutdown trigger (≤0.15V).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Switch Current Limit | 5A typical (guaranteed ≥5A at ≤50% duty cycle, TJ ≥25°C); enables direct 100W conversion without external MOSFETs. |
| Input Voltage Range | 3V to 60V; supported by internal 2.3V low-dropout regulator - ensures stable internal biasing across full range. |
| Quiescent Supply Current | 6mA typical; allows efficient operation in battery-powered or low-power standby systems. |
| Shutdown Supply Current | 50µA typical; reduces system power consumption during idle or sleep modes. |
| Reference Voltage (FB) | 1.244V ±20mV; precision bandgap reference sets output voltage accuracy in non-flyback configurations. |
| Flyback Reference Voltage | 16.3V typical (15–17.6V); enables transformer-coupled isolated output regulation without optocouplers. |
| Switching Frequency | 40kHz ±5kHz; fixed-frequency operation simplifies EMI filtering and magnetics design. |
| Output Switch Breakdown | 65V minimum; supports safe operation with 60V max input and flyback voltage spikes. |
Pinout & Package
LT1070CT#06PBF is housed in a 5-lead plastic TO-220 (T-package) with exposed tab electrically connected to GND. Thermal resistance θJA = 75°C/W (free air), θJC = 2°C/W. Mounting requires heatsinking for >3W dissipation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN | Input Power Supply | Primary DC input (3–60V); powers internal regulator and switch driver; requires local 1µF ceramic + bulk capacitance. |
| VSW | Switch Output | Drains internal 5A N-channel switch; connects to inductor/diode in buck/boost/flyback; must handle 65V transients. |
| GND | Power & Signal Ground | Common return for VIN, VSW, FB, and VC; exposed tab is GND - critical for thermal and noise performance. |
| FB | Feedback Input | Senses output via resistor divider; <0.45V selects flyback mode; 1.244V reference sets regulation point in standard mode. |
| VC | Error Amplifier Output / Control | Current-output node (gm ≈ 4400 µmho); used for compensation, current limit clamp, soft-start, and shutdown activation. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated 5A Power Switch | Eliminates need for external high-current MOSFETs or BJTs - reduces BOM count and layout complexity in 100W-class converters. |
| Flyback Regulation Mode | Enables fully floating, optocoupler-free isolated outputs by regulating flyback pulse amplitude - ideal for medical or industrial isolation requirements. |
| Adaptive Antisaturation Drive | Dynamically optimizes gate drive to minimize switch conduction loss across 0–5A load range - maintains high efficiency at light and heavy loads. |
| Self-Protected Overload Handling | Includes cycle-by-cycle current limiting, thermal shutdown, and undervoltage lockout - prevents damage during short circuits or startup faults. |
| Wide Topology Support | Validated for buck, boost, flyback, forward, inverting, and Cuk configurations - provides single-IC flexibility across diverse power architecture needs. |
| Shutdown Mode (50µA) | Reduces system standby power significantly - suitable for energy-sensitive applications like portable instrumentation or IoT edge nodes. |
Applications
| Industrial Off-Line Power Supply | Battery-Powered DC-DC Converter |
|---|---|
|
Use Scenario: 24V AC/DC adapter powering PLC I/O modules with 12V/5V rails and reinforced isolation. IC Role / Device Role / Timing Role: Primary controller in flyback topology; regulates isolated 5V/12V outputs using internal flyback amplifier and transformer coupling. Use Value: Eliminates optocoupler and secondary-side TL431, reducing component count by ≥4 parts while maintaining ±3% output regulation over line/load/temperature. |
Use Scenario: 12V lead-acid battery boosting to 24V for motor control in mobile robotics. IC Role / Device Role / Timing Role: Boost regulator controller with integrated 5A switch; operates from 9–15V battery range and delivers continuous 24V@4A. Use Value: Delivers >92% peak efficiency at 4A load without external switch - extends runtime and avoids thermal derating in enclosed chassis. |
| Isolated Dual Polarity Supply | High-Voltage Logic Power Converter |
|
Use Scenario: ±15V op-amp supply for precision analog front-end in data acquisition systems. IC Role / Device Role / Timing Role: Inverting buck-boost controller generating negative output from positive input; uses single inductor and shared ground-referenced feedback. Use Value: Achieves ±15V @ 500mA with <1% cross-regulation between rails - eliminates need for separate positive/negative controllers or charge pumps. |
Use Scenario: Converting 48V telecom bus to 5V/3.3V logic rails in base station equipment. IC Role / Device Role / Timing Role: Synchronous buck controller (external FETs optional) operating at 40kHz with 60V input rating and 5A capability. Use Value: Supports 48V nominal input with 60V surge tolerance - avoids input clamping circuits and enables direct connection to PoE++ or 48V DC distribution. |
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 |
|---|---|---|---|
| LT1070HVCT | Higher 60V absolute max input (vs. 40V for LT1070CT); same 5A switch, 40kHz, TO-220 package. | Required for designs with >40V input transients or 60V nominal inputs (e.g., automotive 48V systems). | Select LT1070HVCT if input exceeds 40V; otherwise LT1070CT#06PBF offers identical performance at lower cost. |
| LT1370CN8#PBF | 500kHz switching frequency, 6A switch, SO-8 package; no flyback mode; higher IQ (8mA). | Better suited for compact, high-density designs needing smaller magnetics - but lacks isolated output capability. | Choose LT1370CN8#PBF for space-constrained 5V/3.3V point-of-load; retain LT1070CT#06PBF when isolation, high input voltage, or flyback topology is required. |
Compared with LT1070HVCT, LT1070CT#06PBF trades 20V input headroom for cost and availability; compared with LT1370CN8#PBF, it sacrifices switching frequency and package size to retain flyback isolation and rugged 60V input support - making it uniquely suited for industrial off-line and isolated DC-DC designs.
Availability
LT1070CT#06PBF is available at Aetrix Electronics and suitable for industrial power supplies, battery-backed DC-DC converters, and isolated instrumentation systems requiring stable component supply, long-term lifecycle support, and traceable sourcing.
Supply support for LT1070CT#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 product support, documentation, and manufacturing continuity for legacy Linear parts including the LT1070 series.
The LT1070 family was designed as a rugged, monolithic high-power switching regulator platform targeting industrial, telecom, and off-line power applications where reliability, topology flexibility, and integrated protection are critical.
FAQ
What is the maximum output power achievable with LT1070CT#06PBF without external components?
The LT1070CT#06PBF can deliver up to 100W of output power using only passive external components (inductor, diode, capacitors, resistors). This assumes proper heatsinking, 40kHz operation, and input/output conditions within its 3V–60V range. Power is limited by internal switch dissipation and thermal management - not by control circuitry.
Does LT1070CT#06PBF support isolated flyback operation without an optocoupler?
Yes. The LT1070CT#06PBF includes a dedicated flyback regulation mode activated when the FB pin voltage drops below 0.45V. It uses an internal 16.3V flyback reference to regulate the amplitude of the reflected flyback pulse - enabling fully isolated, optocoupler-free outputs with ±3% regulation across line, load, and temperature.
What is the function of the VC pin on LT1070CT#06PBF?
The VC pin on LT1070CT#06PBF is a multifunction current-output node serving four roles: (1) compensation network connection, (2) current limit threshold adjustment via external clamp, (3) soft-start control using capacitor-coupled ramp, and (4) shutdown activation when pulled ≤0.15V - reducing supply current to 50µA.
Can LT1070CT#06PBF be used in boost configuration with 12V input to generate 24V output?
Yes. The LT1070CT#06PBF is explicitly validated for boost topology in its datasheet (e.g., Figure TA11). With 12V input and proper external components (100µH inductor, Schottky diode, 470µF output cap), it delivers 24V at up to 4A with >90% efficiency - leveraging its 5A internal switch and 60V VSW rating to handle boost voltage stress.
What is the difference between LT1070CT#06PBF and LT1070HVCT?
The LT1070CT#06PBF has a 40V absolute maximum input voltage rating, while the LT1070HVCT is rated for 60V. Both share identical 5A switch, 40kHz frequency, TO-220 package, and functional specifications. Use LT1070HVCT only when input voltage may exceed 40V - otherwise LT1070CT#06PBF is the standard, cost-optimized version.
LT1070CT#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):
- 1.25V
- Voltage - Output (Max):
- 65V (Switch)
- Current - Output:
- 5A (Switch)
- Frequency - Switching:
- 40kHz
- Synchronous Rectifier:
- No
- Operating Temperature:
- 0°C ~ 100°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- TO-220-5 Flow 6
LT1070CT#06PBF FAQ
1.How can I place an order for LT1070CT#06PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT1070CT#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 LT1070CT#06PBF reliable?
The price and inventory of LT1070CT#06PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT1070CT#06PBF is usually 5 days.
3.What payment methods are accepted for LT1070CT#06PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT1070CT#06PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT1070CT#06PBF?
LT1070CT#06PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT1070CT#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 LT1070CT#06PBF?
For technical support, including LT1070CT#06PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT1070CT#06PBF requirements.
6.How does Aetrix verify that LT1070CT#06PBF is sourced from the original manufacturer or authorized distributors?
All LT1070CT#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 LT1070CT#06PBF meets industry standards.
7.What is the process for return or replacement of LT1070CT#06PBF?
All LT1070CT#06PBF units undergo pre-shipment inspection (PSI). If there is an issue with LT1070CT#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 LT1070CT#06PBF part is unused and in its original packaging.
Return procedure for LT1070CT#06PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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