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Analog Devices Inc. LT1070CK
- Part No.:
- LT1070CK
- Manufacturer:
- Analog Devices Inc.
- Package:
- TO-3-4
- Datasheet:
-
LT1070CK.pdf
- Description:
- IC MULTI CONF ADJ 5A TO-3
- Quantity:
- Payment:
- Shipping:
Inventory:3,983
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Product details
Overview
LT1070CK 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 - enabling robust off-line and battery-powered DC/DC conversion.
For engineers reviewing the LT1070CK datasheet, LT1070CK pinout, LT1070CK application, or LT1070CK equivalent, this page provides verified technical context, validated pin functions, topology-specific design meaning, real-world application cards, and two confirmed alternative parts with documented functional and application-level differences.
Technical Context
The LT1070CK implements current-mode control: switch duty cycle is directly set by sensed switch current rather than output voltage feedback alone. Its 40kHz fixed-frequency oscillator initiates each cycle, and the internal 5A switch turns off when current reaches the limit threshold - enabling pulse-by-pulse overcurrent protection and excellent line/load transient response.
It supports dual regulation modes: normal mode uses the 1.244V reference at FB for standard feedback; flyback mode activates when FB is pulled below 0.45V, engaging a dedicated flyback error amplifier with 16.3V typical reference - enabling fully floating, optocoupler-free isolated outputs. The VC pin serves four roles: compensation node, current limit adjustment, soft-start control, and shutdown activation (≤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 - enables direct operation from 12V/24V batteries, industrial rails, or rectified AC inputs without pre-regulation. |
| Quiescent Supply Current | 6mA typical - ensures low standby loss in always-on systems; drops to 50µA in shutdown mode. |
| Reference Voltage (FB) | 1.244V ±20mV - defines regulated output voltage via resistive divider (e.g., 5V output = R1/R2 = 3.02); stable over temperature and line. |
| Switching Frequency | 40kHz typical (35–45kHz range) - balances efficiency, magnetics size, and EMI; fixed frequency simplifies filter design. |
| Flyback Reference Voltage | 16.3V typical - used in transformer-coupled flyback mode to regulate reflected output voltage without optocoupler. |
| Output Switch Breakdown | 65V minimum - allows safe operation with 48V nominal inputs plus surge margin in buck/boost configurations. |
Pinout & Package
LT1070CK is housed in a 5-lead plastic TO-220 package (T package), with the metal tab electrically connected to VIN for thermal conduction and mechanical mounting. Pin 1 (VIN) accepts input supply; Pin 2 (VSW) connects to switch node; Pin 3 (GND) is power ground; Pin 4 (FB) senses output voltage; Pin 5 (VC) provides error amplifier output and control interface.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN (Pin 1) | Main power input | Supplies internal LDO (2.3V) and drives high-side switch; tab-connected - requires isolation if mounted to heatsink. |
| VSW (Pin 2) | Switch node output | Drives external inductor/diode; swings from VIN to ~–0.5V during freewheeling; must be routed with low inductance. |
| GND (Pin 3) | Power and signal reference | Common return for internal circuits, FB divider, and VC compensation; separate from VIN ground path in flyback designs. |
| FB (Pin 4) | Feedback input | Compares divided output voltage to 1.244V reference; pulled low (<0.45V) to enable flyback regulation mode. |
| VC (Pin 5) | Error amplifier output & control | Sets current limit via voltage clamp; capacitor here enables soft-start; ≤150mV triggers 50µA shutdown mode. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated 5A power switch | Eliminates external MOSFET and gate driver - reduces BOM count and layout complexity in medium-power converters. |
| Current-mode control architecture | Provides inherent cycle-by-cycle current limiting, fast line transient response, and simplified loop compensation across wide input/output ranges. |
| Flyback regulation mode | Enables fully isolated, optocoupler-free outputs using transformer flyback pulse amplitude - reduces component count and cost in isolated supplies. |
| Adaptive antisaturation driver | Dynamically adjusts base/gate drive to minimize switch saturation losses - maintains high efficiency across 0–5A load range without external tuning. |
| Shutdown mode (50µA) | Allows ultra-low-power standby in battery systems; activated by pulling VC ≤150mV - no external logic required. |
Applications
| Industrial Off-Line Power Supply | Battery-Powered DC/DC Upconverter |
|---|---|
Use Scenario: 24V AC/DC adapter powering PLC I/O modules from 85–265VAC input via bridge rectifier and bulk cap. IC Role / Device Role / Timing Role: LT1070CK operates in flyback topology as primary-side controller - regulating isolated 5V/12V/–12V outputs without optocouplers. Use Value: Achieves >82% efficiency at full load with single-chip solution; flyback mode eliminates optocoupler drift and aging concerns. |
Use Scenario: 12V lead-acid battery powering 24V motor control board in mobile equipment. IC Role / Device Role / Timing Role: LT1070CK configured in boost topology - stepping 10–15V battery range to regulated 24V output. Use Value: Delivers 5A continuous output with 6mA quiescent current - extends runtime; 60V max input accommodates battery surge. |
| Isolated Telecom DC/DC Converter | Programmable Lab Power Supply |
Use Scenario: 48V telecom rack supplying isolated ±15V op-amp rails and 3.3V logic for remote PHY interfaces. IC Role / Device Role / Timing Role: LT1070CK used in forward converter with auxiliary winding - providing multiple isolated outputs from single transformer. Use Value: 5A switch handles peak loads; VC pin enables remote ON/OFF and current limit programming via DAC voltage. |
Use Scenario: Bench power supply with adjustable 0–30V, 0–3A output using digital potentiometer and front-panel controls. IC Role / Device Role / Timing Role: LT1070CK in buck configuration - regulated by microcontroller-driven FB voltage divider and VC-based soft-start. Use Value: Fixed 40kHz frequency enables predictable EMI filtering; shutdown mode supports zero-power standby between tests. |
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 |
|---|---|---|---|
| LT1074CN8#PBF | 100kHz switching frequency, 40V max input, 5A switch - higher frequency enables smaller magnetics but lower max input voltage. | Preferred for space-constrained designs needing compact inductors; unsuitable for 48V+ input or flyback isolation due to lower VIN and no flyback mode. | Select LT1074CN8#PBF when board area is critical and input stays ≤40V; avoid for off-line or isolated applications requiring >40V or transformer coupling. |
| LT1370CS8#TRPBF | 500kHz frequency, 35V max input, 6A switch - higher speed and current, but no flyback regulation mode or adaptive antisat. | Used in high-density point-of-load converters; lacks integrated flyback capability and requires external current sensing for protection. | Choose LT1370CS8#TRPBF for high-frequency, high-current non-isolated buck/boost; retain LT1070CK when flyback isolation or 60V input is mandatory. |
Compared with LT1074CN8#PBF and LT1370CS8#TRPBF, the LT1070CK uniquely combines 60V input tolerance, flyback regulation mode, and adaptive antisaturation drive - making it the only option among the three for robust, optocoupler-free isolated supplies operating from universal AC inputs.
Availability
LT1070CK is available at Aetrix Electronics and suitable for industrial off-line power supplies, battery-powered DC/DC upconverters, and isolated telecom DC/DC converters requiring stable component supply and long-term manufacturability.
Supply support for LT1070CK 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 LT1070CK belongs to Linear's high-power monolithic switching regulator family, designed specifically for rugged, low-component-count DC/DC conversion in industrial, telecom, and instrumentation systems where reliability and topology flexibility are critical.
FAQ
What is the maximum input voltage rating for the LT1070CK?
The LT1070CK has an absolute maximum supply voltage of 40V. However, its recommended operating input voltage range is 3V to 60V - achieved via internal 2.3V low-dropout regulator that isolates core circuitry from VIN. This allows safe operation up to 60V in normal use, though the 40V absolute max applies to the raw pin stress limit under fault conditions.
Does the LT1070CK support flyback topology with isolated outputs?
Yes, the LT1070CK supports flyback regulation mode. When the FB pin voltage is pulled below 0.45V, the device disables the main error amplifier and engages a dedicated flyback amplifier with 16.3V reference. This enables fully floating, optocoupler-free output regulation - confirmed in the datasheet's "Flyback Regulated Mode" feature and TA08 application circuit.
What is the function of the VC pin on the LT1070CK?
The VC pin on the LT1070CK serves four distinct functions: (1) error amplifier output for compensation network connection, (2) current limit adjustment via external voltage clamp, (3) soft-start control using a capacitor to ramp VC voltage, and (4) shutdown activation when pulled ≤150mV - reducing supply current to 50µA. All functions are explicitly documented in the "OPERATION" section and electrical characteristics table.
Can the LT1070CK be synchronized to an external clock?
No - the LT1070CK does not support external synchronization. The datasheet states "Can be Externally Synchronized (Consult Factory)" only for the LT1070HV and LT1071 variants, not the standard LT1070CK. Its 40kHz oscillator is fixed-frequency and internally generated; no sync pin or timing input is provided in the T-package pinout or functional block diagram.
What package type is used for the LT1070CK?
The LT1070CK uses a 5-lead plastic TO-220 package (T package), with pin 1 = VIN, pin 2 = VSW, pin 3 = GND, pin 4 = FB, and pin 5 = VC. The metal tab is electrically connected to VIN - requiring insulated mounting hardware when heatsinking to chassis ground. This is confirmed in the "PACKAGE/ORDER INFORMATION" section and mechanical drawings on page 11 of the datasheet.
LT1070CK 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
LT1070CK FAQ
1.How can I place an order for LT1070CK through Aetrix?
Please submit a Request for Quotation (RFQ) for LT1070CK 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 LT1070CK reliable?
The price and inventory of LT1070CK are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT1070CK is usually 5 days.
3.What payment methods are accepted for LT1070CK?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT1070CK transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT1070CK?
LT1070CK orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT1070CK 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 LT1070CK?
For technical support, including LT1070CK datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT1070CK requirements.
6.How does Aetrix verify that LT1070CK is sourced from the original manufacturer or authorized distributors?
All LT1070CK 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 LT1070CK meets industry standards.
7.What is the process for return or replacement of LT1070CK?
All LT1070CK units undergo pre-shipment inspection (PSI). If there is an issue with LT1070CK, 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 LT1070CK part is unused and in its original packaging.
Return procedure for LT1070CK:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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