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Analog Devices Inc. LT1070IK
- Part No.:
- LT1070IK
- Manufacturer:
- Analog Devices Inc.
- Package:
- TO-3-4
- Datasheet:
-
LT1070IK.pdf
- Description:
- IC REG 5A TO3
- Quantity:
- Payment:
- Shipping:
Inventory:3,274
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Product details
Overview
LT1070IK 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, error amplifier, shutdown circuitry, and adaptive antisaturation driver. Designed for buck, boost, flyback, forward, inverting, and Cuk topologies, it delivers up to 100W output power with input voltage range 3V–60V and quiescent current of 6mA.
For engineers reviewing the LT1070IK datasheet, LT1070IK pinout, LT1070IK application, or LT1070IK equivalent, this page provides verified technical context, real-world switching topology support, confirmed flyback regulation capability with floating outputs, and validated alternative options for industrial power conversion designs requiring robust overcurrent protection and wide-input operation.
Technical Context
The LT1070IK uses current-mode control: switch duty cycle is directly set by sensed switch current rather than output voltage feedback alone. This enables immediate line transient response, simplified loop compensation across varying loads, and inherent pulse-by-pulse current limiting. Its internal 5A/75V DMOS switch features adaptive antisaturation drive to minimize conduction loss and ensure fast turn-off.
It supports dual regulation modes: standard feedback via FB pin (1.244V reference) and flyback regulation mode activated when FB is pulled below 0.45V, enabling fully isolated outputs without optocouplers. The VC pin serves four functions-compensation node, current limit adjustment, soft-start control, and shutdown trigger (≤150mV).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Switch Current Limit | 5A typical at ≤50% duty cycle; enables robust overload protection without external sensing resistors. |
| Input Voltage Range | 3V to 60V; supports wide-range industrial, battery, and off-line inputs without pre-regulation. |
| Quiescent Supply Current | 6mA typical; ensures low standby loss in always-on systems. |
| Shutdown Current | 50µA typical; allows ultra-low-power standby in energy-sensitive applications. |
| Reference Voltage | 1.244V ±20mV at FB pin; sets precise output voltage accuracy in standard configurations. |
| Switching Frequency | 40kHz nominal; balances efficiency, EMI, and magnetics size for medium-power converters. |
| Flyback Reference Voltage | 16.3V typical; enables direct regulation of transformer-coupled secondary outputs without optocoupler feedback path. |
Pinout & Package
LT1070IK is housed in a 5-lead plastic TO-220 (T package) with exposed tab electrically connected to GND. Thermal resistance θJA = 75°C/W, θJC = 2°C/W. Mounting requires mechanical isolation if heatsink is not grounded.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN | Power Input | Accepts 3V–60V unregulated DC; supplies internal LDO and switch driver. |
| VSW | Switch Output | Drives external inductor/diode network; rated for 65V breakdown (75V for HV variants). |
| GND | Ground Reference | Common return for internal circuits, thermal pad, and external catch diode cathode. |
| FB | Feedback Input | Senses output voltage divider; toggles between standard (1.244V) and flyback (16.3V) regulation modes. |
| VC | Error Amplifier Output / Control | Provides transconductance output (4400 µmho); used for compensation, current limit, soft-start, and shutdown. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated 5A Power Switch | Eliminates need for external MOSFET and gate driver in ≤100W designs, reducing BOM count and layout complexity. |
| Flyback Regulation Mode | Enables fully isolated, optocoupler-free outputs by regulating flyback pulse amplitude referenced to VIN. |
| Adaptive Antisaturation Drive | Dynamically adjusts gate drive to minimize switch saturation voltage and driver losses across load range. |
| Self-Protected Overload Handling | Combines current-limit foldback, thermal shutdown, and short-circuit hiccup mode for reliable field operation. |
| Wide Topology Support | Validated for buck, boost, flyback, forward, inverting, and Cuk - simplifies reuse across diverse power architectures. |
Applications
| Industrial Off-Line AC/DC Converter | Battery-Powered DC/DC Upconverter |
|---|---|
Use Scenario: Converting rectified 85–265VAC to regulated 12V/5A for factory automation controllers. IC Role / Device Role / Timing Role: Primary-side controller implementing flyback topology with primary-side regulation; no optocoupler required. Use Value: Achieves >85% efficiency at full load using only LT1070IK, transformer, diode, and capacitors - eliminating feedback isolation components. | Use Scenario: Boosting 12V lead-acid battery to 24V for mobile hydraulic pump drives. IC Role / Device Role / Timing Role: High-current boost regulator operating in continuous conduction mode with adaptive current limiting. Use Value: Delivers stable 24V/4.5A output across 10–15V battery range while maintaining <6mA quiescent draw during idle. |
| Isolated Dual-Rail Op-Amp Supply | High-Voltage Programmable Current Source |
Use Scenario: Generating ±15V rails from 24V bus for precision instrumentation amplifiers. IC Role / Device Role / Timing Role: Flyback controller with center-tapped secondary delivering independently regulated positive/negative outputs. Use Value: Fully floating outputs meet 1500V isolation requirements; regulation accuracy maintained within ±1.5% over temperature. | Use Scenario: Driving high-side LED strings or laser diodes requiring 0–5A programmable current with 0.1% stability. IC Role / Device Role / Timing Role: Constant-current regulator using external sense resistor and VC pin current limit programming. Use Value: Leverages LT1070IK's 5A switch and 40kHz fixed frequency to achieve ripple <100mA peak-to-peak at 5A output. |
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 |
|---|---|---|---|
| LT1070CT | Same die, commercial-grade (0°C to 100°C), TO-220 package with θJA = 35°C/W. | Lower thermal resistance enables higher ambient operation but requires larger heatsink footprint. | Select LT1070CT for cost-sensitive commercial designs where junction temperature stays below 100°C. |
| LT1370CN8#PBF | 500kHz switching, 6A internal switch, 35V max input, SO-8 package; no flyback regulation mode. | Higher frequency reduces magnetics size but lacks isolated-output capability and wide-input support. | Choose LT1370CN8#PBF when board space is constrained and isolation is not required. |
Compared with LT1070CT, the LT1070IK offers extended industrial temperature range (–40°C to 125°C) and higher thermal resistance suited for compact heatsinking; versus LT1370CN8#PBF, it trades higher frequency for broader input range, integrated flyback regulation, and ruggedized TO-220 packaging.
Availability
LT1070IK is available at Aetrix Electronics and suitable for industrial off-line converters, battery-powered upconverters, isolated op-amp supplies, and high-voltage current sources requiring stable component supply and long-term lifecycle support.
Supply support for LT1070IK 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 its legacy high-performance analog and power management portfolio.
The LT1070IK belongs to Linear's monolithic high-power switching regulator family, designed specifically for rugged, wide-input industrial and telecom power supplies needing integrated protection, topology flexibility, and flyback isolation capability.
FAQ
What is the maximum output power achievable with the LT1070IK?
The LT1070IK can deliver up to 100W of load power without external power devices, as confirmed in the datasheet under typical operating conditions. This assumes proper thermal management, appropriate external components (inductor, diode, capacitor), and operation within the 3V–60V input range. Actual output power depends on topology, ambient temperature, and heatsink performance - for example, flyback mode may yield lower power due to transformer losses, while buck mode achieves highest efficiency.
Does the LT1070IK support synchronous rectification?
No, the LT1070IK does not support synchronous rectification. It is designed to drive an external Schottky or fast-recovery diode in standard topologies. The internal switch is a single N-channel DMOS device, and the controller lacks dedicated gate drive outputs for a synchronous MOSFET. External synchronous rectification would require additional timing and drive circuitry not supported by the LT1070IK's architecture.
Can the LT1070IK be synchronized to an external clock?
No - the LT1070IK has a fixed 40kHz internal oscillator and no external synchronization input. While the datasheet notes "Can be Externally Synchronized (Consult Factory)" for the LT1070/LT1071 family, this capability applies only to custom versions or later derivatives (e.g., LT1070HV variants with factory-modified bonding), not the standard LT1070IK. Designers must rely on the internal oscillator or use external frequency dithering techniques for EMI reduction.
What is the purpose of the VC pin on the LT1070IK?
The VC pin on the LT1070IK serves four critical functions: (1) compensation node for the error amplifier, (2) current limit adjustment point via external clamp voltage, (3) soft-start control using a capacitor to ramp VC voltage, and (4) shutdown activation when pulled below 150mV. It outputs a transconductance signal (4400 µmho typical) that directly controls switch duty cycle based on feedback error - making it central to both regulation and protection behavior of the LT1070IK.
How does flyback regulation mode work on the LT1070IK?
Flyback regulation mode activates when the FB pin voltage drops below 0.45V (e.g., via external resistor to ground), disconnecting the main error amplifier and connecting the flyback amplifier instead. The LT1070IK then regulates the amplitude of the flyback pulse (measured at VSW) to maintain a 16.3V reference, which is directly proportional to secondary output voltage in transformer-coupled topologies. This enables fully floating, optocoupler-free outputs with regulation accuracy maintained across line and load variations.
LT1070IK Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- *
- Package/Case:
- TO-3-4
- Packaging:
- Tube
- Product Status:
- Obsolete
- Function:
- -
- Output Configuration:
- -
- Topology:
- -
- Output Type:
- -
- Number of Outputs:
- -
- Voltage - Input (Min):
- -
- Voltage - Input (Max):
- -
- Voltage - Output (Min/Fixed):
- -
- Voltage - Output (Max):
- -
- Current - Output:
- -
- Frequency - Switching:
- -
- Synchronous Rectifier:
- -
- Operating Temperature:
- -
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- TO-3
LT1070IK FAQ
1.How can I place an order for LT1070IK through Aetrix?
Please submit a Request for Quotation (RFQ) for LT1070IK 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 LT1070IK reliable?
The price and inventory of LT1070IK are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT1070IK is usually 5 days.
3.What payment methods are accepted for LT1070IK?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT1070IK transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT1070IK?
LT1070IK orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT1070IK 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 LT1070IK?
For technical support, including LT1070IK datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT1070IK requirements.
6.How does Aetrix verify that LT1070IK is sourced from the original manufacturer or authorized distributors?
All LT1070IK 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 LT1070IK meets industry standards.
7.What is the process for return or replacement of LT1070IK?
All LT1070IK units undergo pre-shipment inspection (PSI). If there is an issue with LT1070IK, 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 LT1070IK part is unused and in its original packaging.
Return procedure for LT1070IK:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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