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Analog Devices Inc. LT1070CT#30PBF
- Part No.:
- LT1070CT#30PBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- TO-220-5 Formed Leads
- Datasheet:
-
LT1070CT#30PBF.pdf
- Description:
- IC REG BUCK BOOST ADJ 5A TO220-5
- Quantity:
- Payment:
- Shipping:
Inventory:869
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Product details
Overview
LT1070CT#30PBF 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. It operates from 3V to 60V input, delivers up to 100W output, and supports buck, boost, flyback, forward, inverting, and Cuk topologies - widely used in off-line converters and battery upconverters.
For engineers reviewing the LT1070CT#30PBF datasheet, LT1070CT#30PBF pinout, LT1070CT#30PBF application, or LT1070CT#30PBF equivalent, key selection criteria include its 5A switch current limit, 6mA quiescent current, flyback regulation mode for isolated outputs, shutdown threshold at 100–250mV on VC pin, and compatibility with standard switching topologies without optocouplers.
Technical Context
The LT1070CT#30PBF implements current-mode control: switch duty cycle is directly set by sensed switch current rather than output voltage feedback, enabling fast line transient response and simplified loop compensation. Its adaptive antisaturation drive dynamically adjusts gate drive to minimize saturation loss across wide load ranges.
It features dual error amplifier paths - a main amplifier for standard regulation and a dedicated flyback amplifier activated when FB pin voltage drops below 0.45V - enabling fully floating, transformer-coupled outputs without optocouplers. The VC pin serves four functions: compensation node, current limit adjustment, soft-start control, and shutdown activation below 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 robust overload protection in high-power DC/DC stages. |
| Input Voltage Range | 3V to 60V; supports wide-range industrial, automotive, and off-line inputs without external pre-regulation. |
| Quiescent Supply Current | 6mA typical; minimizes no-load power loss in battery-powered or standby-sensitive systems. |
| Shutdown Supply Current | 100–250µA; reduces system standby consumption to sub-milliwatt levels when VC < 0.15V. |
| Switching Frequency | 35–45kHz typical; balances magnetic size, efficiency, and EMI for medium-power applications. |
| Reference Voltage (FB) | 1.244V ±20mV; sets output voltage accuracy in standard buck/boost configurations via resistive divider. |
| Flyback Reference Voltage | 16.3V typical (15–17.6V); defines regulated amplitude of transformer-coupled flyback pulse for isolated output control. |
Pinout & Package
LT1070CT#30PBF is housed in a 5-lead plastic TO-220 (T package) with exposed tab electrically connected to GND. Pin 1 is VIN, Pin 2 is VSW, Pin 3 is GND, Pin 4 is FB, and Pin 5 is VC - verified per LTC DWG #05-08-1421 and datasheet front-view diagram.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN (Pin 1) | Main power supply input | Accepts 3–60V unregulated input; powers internal LDO (2.3V rail) and switch driver; requires local 1µF ceramic + bulk capacitance. |
| VSW (Pin 2) | Internal switch collector/drain node | Connects to primary side of inductor/transformer; must be routed with low-inductance layout to minimize switching spikes and EMI. |
| GND (Pin 3) | Power and signal reference ground | Common return for internal circuits, switch emitter/source, and external compensation components; tied to heatsink tab. |
| FB (Pin 4) | Feedback input / mode select | At 1.244V → standard regulation; pulled below 0.45V → activates flyback amplifier for isolated output control. |
| VC (Pin 5) | Error amplifier output / control node | Serves as compensation point, current limit adjust (clamp), soft-start capacitor node, and shutdown trigger (<0.15V). |
Key Features
| Feature | Design Value |
|---|---|
| Integrated 5A power switch | Eliminates external MOSFET/BJT in ≤100W designs, reducing BOM count and layout complexity. |
| Flyback regulation mode | Enables fully floating, optocoupler-free isolated outputs using transformer-coupled feedback pulse amplitude. |
| Adaptive antisaturation drive | Maintains high efficiency across 0–100% load range by dynamically optimizing switch turn-off timing. |
| Self-protected overload handling | Includes cycle-by-cycle current limiting, thermal shutdown, and short-circuit safe operation without external sensing. |
| Wide topology support | Validated for buck, boost, flyback, forward, inverting, and Cuk - simplifies reuse across diverse power architectures. |
Applications
| Off-Line AC/DC Converter | Battery Upconverter |
|---|---|
Use Scenario: Converting rectified 85–265VAC to isolated 5V/12V/±15V for industrial controls or telecom modules. IC Role / Device Role / Timing Role: Primary-side controller implementing flyback regulation with transformer-coupled feedback pulse sensing. Use Value: Eliminates optocoupler and secondary-side TL431, reducing component count and improving long-term reliability under high-voltage stress. |
Use Scenario: Boosting 12V lead-acid or 24V lithium battery packs to 48V for motor drives or PoE injectors. IC Role / Device Role / Timing Role: High-current boost regulator operating in continuous conduction mode with adaptive current limiting. Use Value: Delivers >5A output at 92% efficiency using single-stage conversion, avoiding cascaded DC/DC stages and associated losses. |
| Fully Floating Multiple Outputs | Logic-to-Analog Supply Generation |
Use Scenario: Generating isolated ±15V op-amp rails and +5V digital logic from a single 24V input in data acquisition systems. IC Role / Device Role / Timing Role: Flyback controller regulating primary output while deriving additional secondaries via turns ratio. Use Value: Achieves tight cross-regulation between outputs without post-regulators, leveraging inherent pulse-amplitude feedback stability. |
Use Scenario: Converting 5V logic rail to ±15V analog supply for precision instrumentation amplifiers and DACs. IC Role / Device Role / Timing Role: Inverting regulator generating negative output with low noise and high PSRR via current-mode control. Use Value: Provides clean, well-regulated analog supplies with <10mV ripple and fast transient response to analog load steps. |
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 |
|---|---|---|---|
| LT1070HVCT | Higher 60V max input and 75V switch breakdown vs. 40V/65V for LT1070CT#30PBF; otherwise identical pinout and specs. | Required for 48V nominal or 305VAC-derived inputs where transient overvoltage exceeds 40V. | Select LT1070HVCT when input can exceed 40V - no design changes needed beyond verifying input capacitor rating. |
| LT1370CN8#PBF | 500kHz switching frequency, 6A switch, 35V max input; different pinout (8-pin SOIC), no flyback mode, higher IQ (8mA). | Targets compact, high-density designs needing smaller magnetics; unsuitable for flyback isolation or >35V inputs. | Choose LT1370CN8#PBF only when board space is constrained and flyback isolation is not required. |
Compared with LT1070HVCT, the LT1070CT#30PBF offers lower cost and sufficient voltage margin for 24–40V systems, while LT1370CN8#PBF trades isolation capability and input range for higher frequency and smaller footprint - making LT1070CT#30PBF optimal for rugged, isolated, medium-frequency industrial power supplies.
Availability
LT1070CT#30PBF is available at Aetrix Electronics and suitable for off-line AC/DC converters, battery upconverters, and isolated multi-rail power supplies requiring stable component supply, long-lifecycle assurance, and legacy design continuity.
Supply support for LT1070CT#30PBF 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 support for legacy Linear power products. Linear pioneered high-performance analog ICs with emphasis on power management, precision signal conditioning, and robust industrial interfaces.
The LT1070 series was designed for high-reliability, medium-power DC/DC conversion in industrial, telecom, and military-aerospace applications - emphasizing integration, topology flexibility, and self-protection without external supervision.
FAQ
What is the maximum output power achievable with the LT1070CT#30PBF?
The LT1070CT#30PBF can deliver up to 100W of load power without external power devices, as confirmed in the datasheet's Typical Application section and Power vs. Input Voltage graph. This assumes proper heatsinking, 40kHz operation, and use of recommended external components like low-ESR capacitors and low-DCR inductors. Output power scales with input voltage and topology - e.g., buck mode yields ~5A × VOUT, while boost/flyback enable higher VOUT at reduced current.
Does the LT1070CT#30PBF support flyback topology with isolated outputs?
Yes, the LT1070CT#30PBF supports flyback regulation mode by pulling the FB pin below 0.45V, which disconnects the main error amplifier and activates the dedicated flyback amplifier. This allows regulation of transformer-coupled outputs without optocouplers or extra windings - verified in the Block Diagram, Electrical Characteristics (VFB flyback ref = 16.3V), and TA08 application circuit.
What is the function of the VC pin on the LT1070CT#30PBF?
The VC pin on the LT1070CT#30PBF serves four critical functions: (1) compensation node for loop stability, (2) current limit adjustment via external clamp voltage, (3) soft-start control using a capacitor to ramp VC voltage, and (4) shutdown activation when pulled below 0.15V - reducing supply current to 100–250µA. All are documented in the Operation section and VC pin characteristics graphs (G14, G20).
Can the LT1070CT#30PBF be synchronized to an external clock?
No - the LT1070CT#30PBF does not support external synchronization. The datasheet states "Can be Externally Synchronized (Consult Factory)" as a footnote under Features, but this capability applies only to special factory-order variants, not the standard LT1070CT#30PBF. The internal 40kHz oscillator is fixed and not sync-capable in production versions.
What is the thermal performance of the LT1070CT#30PBF in TO-220 package?
The LT1070CT#30PBF in T-package has θJA = 75°C/W (free-air) and θJC = 2°C/W (junction-to-case), with TJMAX = 100°C for commercial grade. At 5A switch current and 40V input, typical power dissipation is ~2.5W - requiring a minimum 25cm² copper pour or small heatsink to maintain junction temperature below 100°C. Derating curves in Figure G01 confirm stable operation up to 125°C ambient with adequate cooling.
LT1070CT#30PBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- TO-220-5 Formed Leads
- 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 30
LT1070CT#30PBF FAQ
1.How can I place an order for LT1070CT#30PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT1070CT#30PBF 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#30PBF reliable?
The price and inventory of LT1070CT#30PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT1070CT#30PBF is usually 5 days.
3.What payment methods are accepted for LT1070CT#30PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT1070CT#30PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT1070CT#30PBF?
LT1070CT#30PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT1070CT#30PBF 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#30PBF?
For technical support, including LT1070CT#30PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT1070CT#30PBF requirements.
6.How does Aetrix verify that LT1070CT#30PBF is sourced from the original manufacturer or authorized distributors?
All LT1070CT#30PBF 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#30PBF meets industry standards.
7.What is the process for return or replacement of LT1070CT#30PBF?
All LT1070CT#30PBF units undergo pre-shipment inspection (PSI). If there is an issue with LT1070CT#30PBF, 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#30PBF part is unused and in its original packaging.
Return procedure for LT1070CT#30PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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