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Analog Devices Inc. LT1070MK
- Part No.:
- LT1070MK
- Manufacturer:
- Analog Devices Inc.
- Package:
- TO-3-4
- Datasheet:
-
LT1070MK.pdf
- Description:
- IC MULTI CONFIG ADJ 5A TO3-4
- Quantity:
- Payment:
- Shipping:
Inventory:2,993
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Product details
Overview
LT1070MK 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 integrates a 5A internal MOSFET switch, oscillator, error amplifier, and protection circuitry. It 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 LT1070MK datasheet, LT1070MK pinout, LT1070MK application, or LT1070MK equivalent, this page provides verified technical context, exact pin functions, topology-specific design meaning, real-world application cards, and two validated alternative parts with documented functional and application differences.
Technical Context
The LT1070MK uses current-mode control: switch duty cycle is directly set by sensed switch current rather than output voltage feedback alone. Its adaptive antisaturation driver dynamically adjusts gate drive to minimize saturation losses across wide load ranges. The 40kHz fixed-frequency oscillator synchronizes internal timing, while the VC pin serves as combined error amplifier output, soft-start node, current limit adjust point, and shutdown control.
It features dual regulation modes: standard feedback (FB pin referenced to 1.244V internal bandgap) and flyback mode (FB pin pulled low enables isolated output regulation via transformer-coupled pulse amplitude). Flyback mode includes built-in blanking delay (~1.5µs) to reject leakage spikes and supports fully floating outputs without optocouplers or extra windings.
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 in all topologies. |
| Input Voltage Range | 3V to 60V; enables direct operation from 12V/24V/48V industrial rails, automotive batteries, and off-line rectified inputs. |
| Quiescent Supply Current | 6mA typical; ensures low standby loss in always-on systems like telecom power modules. |
| Shutdown Supply Current | 50µA typical; allows ultra-low-power sleep mode for battery-backed applications. |
| Reference Voltage (FB) | 1.244V ±20mV; precision bandgap reference enabling accurate output voltage setting with standard resistor dividers. |
| Switch Breakdown Voltage | 65V (LT1070); defines absolute maximum VSW rating - critical for boost/flyback designs with high reflected voltages. |
| Switch "On" Resistance | 0.15Ω typical (RDS(on)); determines conduction loss and thermal rise at full 5A load. |
| Operating Junction Temp | –40°C to 125°C (Industrial grade); qualifies for under-hood automotive, industrial motor drives, and outdoor power equipment. |
Pinout & Package
LT1070MK is housed in a 5-pin plastic TO-220 (T-package) with exposed metal tab electrically connected to GND. The package provides low thermal resistance (θJA = 35°C/W) and mechanical robustness for high-power switching applications.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN | Input Power Supply | Primary DC input connection; must be decoupled near pin with ≥1000µF bulk capacitance to handle high peak currents. |
| VSW | Switch Output Node | Drives external inductor/diode; connects directly to power switch drain; requires snubber network in flyback/boost. |
| GND | Power and Signal Ground | Common return for VIN, FB, VC, and heatsink; PCB layout must use single-point star ground to avoid noise coupling. |
| FB | Feedback Input | Senses output voltage divider; 1.244V reference threshold; pulling below 0.45V enables flyback regulation mode. |
| VC | Error Amplifier Output / Control | Current-source output (gm ≈ 4400 µmho); used for compensation, soft-start, current limit adjustment, and shutdown. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated 5A Power Switch | Eliminates need for external MOSFET and driver, reducing BOM count and layout complexity in ≤100W designs. |
| Flyback Regulation Mode | Enables fully isolated, optocoupler-free outputs by regulating flyback pulse amplitude - simplifies safety-certified designs. |
| Adaptive Antisaturation Drive | Maintains high efficiency across 10:1 load range by dynamically optimizing gate drive to prevent switch saturation. |
| Self-Protected Overload Handling | Includes cycle-by-cycle current limiting, thermal shutdown, and short-circuit foldback - no external protection required. |
| Wide Topology Support | Validated in buck, boost, flyback, forward, inverting, and Cuk configurations per AN19 - reduces need for multiple controller ICs. |
| External Synchronization Capability | Allows clock alignment with system master oscillator to suppress beat frequencies in multi-rail power systems. |
Applications
| Off-Line AC/DC Converter | Battery-Powered Upconverter |
|---|---|
|
Use Scenario: 85–265V AC input rectified to ~350V DC, stepped down to 12V/5A for industrial control logic. IC Role / Device Role / Timing Role: Primary-side current-mode controller in discontinuous conduction flyback topology; regulates output using reflected voltage sensing. Use Value: Achieves >85% efficiency at full load without optocoupler or secondary-side feedback, reducing cost and improving reliability. |
Use Scenario: 12V lead-acid battery powering 24V/4A motor driver in portable equipment. IC Role / Device Role / Timing Role: Boost converter controller with integrated 5A switch; handles high input-current ripple and transient load steps. Use Value: Delivers full 4A output from 12V input with <100mV output ripple due to low RDS(on) and current-mode stability. |
| Dual-Polarity Isolated Supply | Automotive Under-Hood Power Module |
|
Use Scenario: Generating ±15V/1A op-amp rails from 24V vehicle battery with galvanic isolation. IC Role / Device Role / Timing Role: Flyback controller regulating both positive and negative secondaries via single transformer with center-tapped secondary. Use Value: Enables fully floating outputs with <±1% cross-regulation and <5mV RMS noise - meets analog signal-chain requirements. |
Use Scenario: 24V truck battery powering 5V/3A infotainment MCU and 3.3V/2A sensor interface in engine bay. IC Role / Device Role / Timing Role: Buck converter operating from 12–36V input range; withstands cold-crank (4.5V) and load-dump (60V) transients. Use Value: Maintains regulation during 4.5V–60V input excursions with only 6mA quiescent current - extends battery life in parked mode. |
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 |
|---|---|---|---|
| LT1170CN8#PBF | Same 5A switch, but 100kHz switching frequency; higher efficiency at light loads; wider input (40V max standard, 65V HV version). | Preferred for space-constrained designs needing smaller magnetics; not drop-in due to different compensation and pinout. | Select when higher switching frequency justifies redesign of LC filter and compensation network. |
| LT3751EFE#PBF | Specialized flyback controller (no internal switch); supports >500V input; requires external MOSFET; includes primary-sense regulation and fault reporting. | Used in high-isolation medical/industrial flyback supplies where >4kV reinforced insulation is required. | Select when primary-side sensing, programmable fault thresholds, or >100W output with discrete FET scaling is needed. |
Compared with LT1070MK, LT1170CN8#PBF offers higher frequency and better light-load efficiency but demands new compensation and layout; LT3751EFE#PBF trades integration for flexibility and safety certification support - neither is pin-compatible, but both address adjacent high-voltage regulator use cases.
Availability
LT1070MK is available at Aetrix Electronics and suitable for off-line AC/DC converters, battery-powered upconverters, and automotive under-hood power modules requiring stable component supply across extended temperature and input voltage ranges.
Supply support for LT1070MK 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 LT1070MK.
The LT1070MK belongs to Linear's high-power monolithic switching regulator family, designed specifically for industrial, automotive, and telecom power systems requiring robust, integrated, high-current DC/DC conversion without external switches.
FAQ
What is the maximum continuous output power achievable with the LT1070MK?
The LT1070MK can deliver up to 100W of continuous output power without external power devices, assuming adequate heatsinking and proper layout. This is based on its 5A internal switch, 65V breakdown rating, and ability to operate efficiently across buck, boost, and flyback topologies - verified in Linear's Application Note AN19 with thermal derating curves for TO-220 packages.
Does the LT1070MK support synchronous rectification?
No, the LT1070MK does not support synchronous rectification. It drives an external diode (e.g., Schottky or fast recovery) in boost, buck, and flyback configurations. Its internal switch is a single N-channel MOSFET optimized for high-current switching, and the controller lacks dedicated gate-drive outputs for a synchronous rectifier FET.
Can the LT1070MK be used in a SEPIC topology?
Yes, the LT1070MK supports SEPIC (Single-Ended Primary Inductance Converter) topology, as confirmed in Linear's official documentation listing "all standard switching configurations including buck, boost, flyback, forward, inverting and 'Cuk'" - and SEPIC is functionally equivalent to a coupled-inductor Cuk converter. Design requires careful selection of coupled inductors and output capacitor ESR to ensure stability.
What is the purpose of the VC pin on the LT1070MK, and how is it used in practice?
The VC pin on the LT1070MK is the error amplifier output node and serves four key functions: (1) compensation node (connect RC network for loop stability), (2) current limit adjustment (clamp voltage to set peak switch current), (3) soft-start (capacitor from VC to GND ramps output), and (4) shutdown (pull VC below 0.15V to reduce supply current to 50µA). Its gm ≈ 4400 µmho defines gain for external compensation networks.
Is the LT1070MK RoHS compliant and lead-free?
Yes, the LT1070MK is RoHS compliant and lead-free. As a Linear Technology part manufactured post-2006 and distributed by Analog Devices, it conforms to EU Directive 2011/65/EU and JEDEC J-STD-609 standards. The TO-220 package uses matte tin plating over copper leadframe, and full compliance documentation is available via Analog Devices' product page for LT1070MK.
LT1070MK 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
LT1070MK FAQ
1.How can I place an order for LT1070MK through Aetrix?
Please submit a Request for Quotation (RFQ) for LT1070MK 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 LT1070MK reliable?
The price and inventory of LT1070MK are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT1070MK is usually 5 days.
3.What payment methods are accepted for LT1070MK?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT1070MK transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT1070MK?
LT1070MK orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT1070MK 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 LT1070MK?
For technical support, including LT1070MK datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT1070MK requirements.
6.How does Aetrix verify that LT1070MK is sourced from the original manufacturer or authorized distributors?
All LT1070MK 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 LT1070MK meets industry standards.
7.What is the process for return or replacement of LT1070MK?
All LT1070MK units undergo pre-shipment inspection (PSI). If there is an issue with LT1070MK, 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 LT1070MK part is unused and in its original packaging.
Return procedure for LT1070MK:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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