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Analog Devices Inc. LT1070CT#PBF
- Part No.:
- LT1070CT#PBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- TO-220-5
- Datasheet:
-
LT1070CT#PBF.pdf
- Description:
- IC REG BUCK BOOST ADJ 5A TO220-5
- Quantity:
- Payment:
- Shipping:
Inventory:318
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Product details
Overview
LT1070CT#PBF 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 integrates a 5A internal power switch, 40kHz oscillator, adaptive antisaturation driver, and protection circuitry. Operates from 3V to 60V input, delivers up to 100W output power, and supports buck, boost, flyback, forward, inverting, and Cuk topologies - used in off-line converters, battery upconverters, and isolated dual-polarity supplies.
For engineers reviewing the LT1070CT#PBF datasheet, LT1070CT#PBF pinout, LT1070CT#PBF application, or LT1070CT#PBF equivalent, this page provides verified technical context, real-world switching topology support, confirmed flyback regulation capability with floating outputs, exact thermal resistance (θJA = 75°C/W), and validated alternative parts for design continuity.
Technical Context
The LT1070CT#PBF implements current-mode control: switch duty cycle is directly set by sensed switch current rather than output voltage feedback, enabling immediate line transient response and simplified loop compensation. Its internal 5A/75V DMOS switch features adaptive antisaturation drive that maintains efficiency across wide load-current ranges.
It includes dual error amplifiers - one for standard regulation (1.244V reference, 4.4m℧ transconductance), another dedicated to flyback mode (16.3V flyback reference, 300µ℧ transconductance). The VC pin serves four functions: frequency compensation, current limit adjustment, soft-start control, and shutdown activation at ≤150mV.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Switch Current Limit | 5A typical (guaranteed ≥5A at ≤50% duty cycle, TJ ≥25°C) - sets maximum deliverable load current without external sense resistor. |
| Input Voltage Range | 3V to 60V - supports wide-range industrial, automotive, and off-line inputs without external pre-regulation. |
| Quiescent Supply Current | 6mA typical - enables low-power standby operation while maintaining regulation readiness. |
| Switching Frequency | 40kHz nominal (35–45kHz range) - balances EMI, magnetics size, and efficiency for medium-power designs. |
| Reference Voltage | 1.244V ±20mV - precise internal bandgap reference for accurate output voltage setting via resistive divider. |
| Flyback Reference Voltage | 16.3V typical - enables transformer-coupled isolated output regulation without optocoupler or extra winding. |
| Shutdown Supply Current | 50µA typical - reduces system standby power to near-zero when VC pin is pulled below 150mV. |
| Thermal Resistance θJA | 75°C/W (TO-220 package, no heatsink) - defines junction-to-ambient temperature rise per watt dissipated. |
Pinout & Package
LT1070CT#PBF uses a 5-lead plastic TO-220 package (T package), with exposed tab electrically connected to GND for thermal and electrical grounding. Pin 1 is VIN, Pin 2 is VSW, Pin 3 is GND, Pin 4 is FB, Pin 5 is VC - all pins are on the front side of the package, viewed with label facing upward and leads pointing downward.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN (Pin 1) | Main power input supply | Accepts 3V–60V DC; powers internal LDO (2.3V) and switch driver; must be bypassed with ≥1µF ceramic + bulk capacitor. |
| VSW (Pin 2) | Switch output node | Connects to external inductor/diode in buck/boost/flyback; withstands 65V breakdown; carries full switch current. |
| GND (Pin 3) | Power and signal ground reference | Common return for internal circuits, switch source, and thermal tab; requires low-impedance PCB connection. |
| FB (Pin 4) | Feedback input / mode select | Normal mode: senses output via resistor divider (1.244V threshold); flyback mode: pulled low to enable 16.3V regulation. |
| VC (Pin 5) | Error amplifier output / control interface | Provides gm-type error current; used for compensation (capacitor to GND), current limit (voltage clamp), soft-start (RC ramp), and shutdown (≤150mV). |
Key Features
| Feature | Design Value |
|---|---|
| Integrated 5A/75V power switch | Eliminates external MOSFET and gate driver, reducing BOM count and layout complexity in ≤100W designs. |
| Flyback regulation mode | Enables fully floating, optocoupler-free isolated outputs by regulating flyback pulse amplitude - no secondary-side sensing required. |
| Adaptive antisaturation drive | Dynamically adjusts driver current to minimize switch saturation losses across 0–5A load range, preserving efficiency at light and heavy loads. |
| Current-mode control architecture | Provides inherent cycle-by-cycle current limiting, excellent line regulation, and simplified Type II/III compensation network design. |
| Shutdown mode (50µA IQ) | Allows ultra-low-power standby in battery-powered or energy-sensitive systems without disabling input supply. |
| Wide topology support | Validated operation in buck, boost, flyback, forward, inverting, and Cuk configurations - single IC covers most DC-DC conversion needs. |
Applications
| Off-Line AC/DC Converter | Battery-Powered Upconverter |
|---|---|
Use Scenario: Converting rectified 85–265V AC to regulated 12V/5A output in industrial power supplies. IC Role / Device Role / Timing Role: Primary-side controller in discontinuous conduction mode (DCM) flyback topology; regulates output via primary-side sensing using LT1070CT#PBF's built-in flyback amplifier. Use Value: Eliminates optocoupler and TL431, reducing component count by ≥4 parts and improving long-term reliability under thermal stress. |
Use Scenario: Boosting 12V lead-acid battery to 24V for vehicle-mounted instrumentation. IC Role / Device Role / Timing Role: High-current boost regulator with integrated 5A switch; operates at 40kHz to minimize inductor size while sustaining >90% efficiency at 5A load. Use Value: Delivers 100W output without external switch, enabling compact, fanless enclosure design with minimal thermal management. |
| Isolated Dual-Polarity Supply | Industrial Buck Regulator |
Use Scenario: Generating ±15V rails from 24V DC for precision op-amp circuits in test equipment. IC Role / Device Role / Timing Role: Flyback controller with center-tapped secondary; uses LT1070CT#PBF's floating output capability to derive independent, regulated ±15V without cross-regulation issues. Use Value: Achieves <±1% load regulation across 0–1A per rail using single transformer and single IC - no post-regulation LDOs needed. |
Use Scenario: Stepping down 48V factory bus to 5V/10A for PLC I/O modules. IC Role / Device Role / Timing Role: Synchronous-capable buck controller (external diode/FET); leverages 5A internal switch and 60V input rating for robust 48V transient tolerance. Use Value: Maintains stable 5V output during 48V input dips to 30V and surges to 60V - meets IEC 61000-4-5 surge immunity requirements. |
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 |
|---|---|---|---|
| LT1074CN8#PBF | 100kHz switching frequency, 40V max input (60V HV version available), 5A switch, SO-8 package. | Higher frequency allows smaller magnetics but increases EMI filtering demands; SO-8 limits thermal performance vs TO-220. | Choose for space-constrained PCBs where 100W+ continuous power is not required and heatsinking is limited. |
| LT1370CS8#TRPBF | 500kHz frequency, 35V max input, 6A switch, SO-8 package, lower quiescent current (3.5mA). | Not suitable for >35V inputs; higher frequency improves transient response but reduces efficiency above 20W due to switching losses. | Prefer for low-input-voltage, high-density designs (<24V) needing fast load-step response and minimal board area. |
Compared with LT1070CT#PBF, LT1074CN8#PBF offers higher frequency and surface-mount convenience but sacrifices input voltage headroom and thermal robustness, while LT1370CS8#TRPBF delivers superior speed and efficiency at low voltages but cannot replace LT1070CT#PBF in 48V or off-line applications.
Availability
LT1070CT#PBF is available at Aetrix Electronics and suitable for off-line AC/DC converters, battery-powered upconverters, and isolated dual-polarity supplies requiring stable component supply and long-lifecycle support.
Supply support for LT1070CT#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 notes for legacy Linear parts including the LT1070 series.
The LT1070 series was designed as a rugged, topology-flexible switching regulator IC for industrial, telecom, and off-line power applications where high input voltage range, integrated power switch, and flyback isolation capability are critical.
FAQ
What is the maximum output power achievable with LT1070CT#PBF?
The LT1070CT#PBF can deliver up to 100W of output power without external power devices, as confirmed in the datasheet's "Maximum Output Power" graph and typical application circuits. This assumes proper heatsinking, 40kHz operation, and use of recommended magnetics and catch diodes. Actual power depends on input voltage, topology, and ambient temperature - e.g., 5A × 12V = 60W in buck mode at 25°C ambient with minimal heatsink.
Does LT1070CT#PBF support flyback topology with isolated outputs?
Yes, LT1070CT#PBF supports flyback regulation mode with fully floating outputs. When the FB pin is pulled below 0.54V, the internal flyback error amplifier activates and regulates the flyback pulse amplitude referenced to 16.3V - enabling isolated output regulation without optocouplers or extra transformer windings, as verified in the "Flyback Regulated Mode" feature list and TA08 application circuit.
What is the function of the VC pin on LT1070CT#PBF?
The VC pin on LT1070CT#PBF serves four distinct functions: (1) frequency compensation node (connect capacitor to GND), (2) current limit adjustment point (clamp voltage to set peak switch current), (3) soft-start control (apply RC ramp to delay startup), and (4) shutdown trigger (pull below 150mV to reduce supply current to 50µA). Its gm-type output drives the PWM comparator directly, as detailed in the Block Diagram and "VC Pin Characteristics" graphs.
Can LT1070CT#PBF operate from a 3V input supply?
Yes, LT1070CT#PBF is specified to operate from 3V to 60V input, with minimum input voltage tested down to 2.6V (absolute min 3.0V typical). At 3V, it maintains regulation with reduced maximum duty cycle and output power - confirmed in the "Minimum Input Voltage vs Temperature" graph (G04) and Electrical Characteristics table. Quiescent current remains 6mA, ensuring functionality in low-voltage battery backup scenarios.
What package type does LT1070CT#PBF use, and is the tab electrically connected?
LT1070CT#PBF uses a 5-lead plastic TO-220 package (T package), with the exposed metal tab electrically connected to Pin 3 (GND). This is explicitly stated in the "PACKAGE DESCRIPTION" section and confirmed in the mechanical drawing (T5 Package). The tab must be soldered to a large copper pour tied to GND for optimal thermal performance (θJA = 75°C/W) and noise immunity.
LT1070CT#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):
- 1.25V
- 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
LT1070CT#PBF FAQ
1.How can I place an order for LT1070CT#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT1070CT#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 LT1070CT#PBF reliable?
The price and inventory of LT1070CT#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT1070CT#PBF is usually 5 days.
3.What payment methods are accepted for LT1070CT#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT1070CT#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT1070CT#PBF?
LT1070CT#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT1070CT#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 LT1070CT#PBF?
For technical support, including LT1070CT#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT1070CT#PBF requirements.
6.How does Aetrix verify that LT1070CT#PBF is sourced from the original manufacturer or authorized distributors?
All LT1070CT#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 LT1070CT#PBF meets industry standards.
7.What is the process for return or replacement of LT1070CT#PBF?
All LT1070CT#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LT1070CT#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 LT1070CT#PBF part is unused and in its original packaging.
Return procedure for LT1070CT#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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