My Inquiry
My Account
Analog Devices Inc. LT1070IT#PBF
- Part No.:
- LT1070IT#PBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- TO-220-5
- Datasheet:
-
LT1070IT#PBF.pdf
- Description:
- IC REG BUCK BOOST ADJ 5A TO220-5
- Quantity:
- Payment:
- Shipping:
Inventory:2,737
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
LT1070IT#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. It operates from 3V to 60V input and delivers up to 100W output power in buck, boost, flyback, forward, inverting, and Cuk topologies - used in off-line converters, battery upconverters, and isolated dual-rail supplies.
For engineers reviewing the LT1070IT#PBF datasheet, LT1070IT#PBF pinout, LT1070IT#PBF application, or LT1070IT#PBF equivalent, key selection criteria include its 5A switch current limit, 40kHz fixed-frequency operation, flyback regulation mode for fully floating outputs, shutdown current of 50µA, and compatibility with wide-input industrial and battery-powered DC-DC designs.
Technical Context
The LT1070IT#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 to maintain efficiency across wide load ranges.
It supports dual regulation modes: normal mode uses the 1.244V reference at FB for standard topologies; pulling FB below 0.45V activates flyback mode, where regulation occurs via the 16.3V flyback reference and dedicated flyback error amplifier - enabling optocoupler-free isolated outputs with transformer-coupled feedback.
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 battery inputs including 24V/48V systems and offline-derived rails. |
| Switching Frequency | 40kHz typical (35–45kHz range) - enables use of cost-effective magnetic components while minimizing EMI compared to MHz-class regulators. |
| Quiescent Supply Current | 6mA typical - ensures low no-load power loss in always-on applications like standby power supplies. |
| Shutdown Supply Current | 50µA typical - reduces system standby consumption to microamp level when VC pin is pulled below 0.15V. |
| Reference Voltage (FB) | 1.244V ±20mV - precision bandgap reference enabling accurate output voltage setting with standard resistor dividers. |
| Flyback Reference Voltage | 16.3V typical - enables direct regulation of reflected flyback pulse amplitude for isolated output control without optocouplers. |
Pinout & Package
LT1070IT#PBF is housed in a 5-lead plastic TO-220 (T-package) with exposed tab electrically connected to GND. The package provides thermal resistance θJA = 75°C/W and θJC = 2°C/W, suitable for heatsink mounting in medium-power applications.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN | Power Input | Primary supply input (3V–60V); powers internal LDO and switch driver; requires local bypass capacitor. |
| VSW | Switch Output | Drain of internal 5A/75V DMOS switch; connects to inductor/diode in buck/boost/flyback configurations. |
| GND | Ground Reference | Power and signal ground; tab is internally bonded to this pin - must be thermally and electrically connected to heatsink. |
| FB | Feedback Input | Senses output voltage divider; <0.45V selects flyback mode; 1.244V reference sets regulation point in normal mode. |
| VC | Error Amplifier Output / Control | Current-output node for compensation, soft-start, current limit adjustment, and shutdown activation (≤0.15V). |
Key Features
| Feature | Design Value |
|---|---|
| Integrated 5A Power Switch | Eliminates external MOSFET and gate driver, reducing BOM count and layout complexity in ≤100W converters. |
| Flyback Regulation Mode | Enables fully floating, transformer-isolated outputs with precise regulation using only primary-side sensing - no optocoupler or secondary-side bias required. |
| Adaptive Antisaturation Drive | Dynamically adjusts gate drive to minimize switch conduction loss and ensure fast turn-off across 0–5A load range. |
| Self-Protected Operation | Includes overcurrent limiting, thermal shutdown, and internal LDO - allows "bust-proof" operation similar to linear regulators. |
| Wide Topology Support | Validated for buck, boost, flyback, forward, inverting, and Cuk configurations - one IC covers most non-isolated and isolated DC-DC needs. |
Applications
| Off-Line AC/DC Converter | Battery-Powered Upconverter |
|---|---|
|
Use Scenario: Converting rectified 100–370V DC (from universal AC input) to regulated 12V/5A output in industrial power supplies. IC Role / Device Role / Timing Role: Primary-side controller implementing flyback topology with primary-sense regulation; 40kHz switching defines transformer size and EMI profile. Use Value: Eliminates optocoupler and TL431, reducing component count and cost while maintaining ±3% output regulation across line/load/temperature. |
Use Scenario: Boosting 12V lead-acid or 24V LiFePO₄ battery to 48V for telecom remote radio units. IC Role / Device Role / Timing Role: High-current boost controller with integrated 5A switch; handles wide input variation (10–30V) and delivers stable 48V/2.5A output. Use Value: Delivers >90% peak efficiency at full load without external switch, simplifying thermal design and enabling compact enclosure integration. |
| Isolated Dual-Rail Op-Amp Supply | Industrial Programmable Logic Controller (PLC) Power |
|
Use Scenario: Generating ±15V rails from 24V DC for precision analog signal conditioning in test equipment. IC Role / Device Role / Timing Role: Flyback controller regulating both positive and negative windings simultaneously; uses single transformer with center-tapped secondary. Use Value: Achieves cross-regulation better than ±5% between rails without post-regulation, reducing parts count versus dual independent converters. |
Use Scenario: Providing 5V/3A and 24V/1A auxiliary supplies inside DIN-rail mounted PLCs powered from 24V or 48V field bus. IC Role / Device Role / Timing Role: Primary buck converter for 5V rail; secondary boost or flyback stage derived from same LT1070IT#PBF-controlled transformer. Use Value: Supports extended temperature operation (–40°C to 125°C junction) and withstands 60V transients per IEC 61000-4-5, meeting industrial 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 |
|---|---|---|---|
| LT1070HVIT#PBF | Higher 60V absolute max input and 75V switch breakdown vs. 40V/65V for LT1070IT#PBF; otherwise identical pinout, specs, and functionality. | Required for designs operating above 40V input or subject to >40V transients; not drop-in for LT1070IT#PBF due to different absolute max ratings. | Select LT1070HVIT#PBF when input can exceed 40V or robustness against line surges is critical; otherwise LT1070IT#PBF suffices for ≤40V nominal inputs. |
| LT1370CS#PBF | 500kHz switching frequency, 6A switch, 35V max input; smaller external magnetics but higher EMI; different pinout and compensation requirements. | Better suited for space-constrained, high-density designs needing faster transient response; incompatible with existing LT1070 layouts. | Choose LT1370CS#PBF only when board area is limited and 500kHz operation is acceptable; not a pin-compatible replacement. |
Compared with LT1070HVIT#PBF, the LT1070IT#PBF trades 20V input headroom for cost and qualification continuity in ≤40V systems; versus LT1370CS#PBF, it offers lower EMI and proven reliability in legacy industrial designs but requires larger magnetics.
Availability
LT1070IT#PBF is available at Aetrix Electronics and suitable for off-line AC/DC converters, battery-powered upconverters, and industrial PLC power supplies requiring stable component supply and long-term lifecycle support.
Supply support for LT1070IT#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 product line was designed as a rugged, easy-to-use monolithic switching regulator family targeting industrial, telecom, and instrumentation power supplies where reliability, wide input range, and topology flexibility are essential.
FAQ
What is the maximum continuous output power achievable with the LT1070IT#PBF?
The LT1070IT#PBF can deliver up to 100W of continuous output power in optimized buck or boost configurations with adequate heatsinking and proper layout. This assumes 3V–60V input, 40kHz switching, and operation within its 5A switch current limit and thermal limits (TJ ≤ 125°C). Actual power depends on topology, ambient temperature, and heatsink performance.
Does the LT1070IT#PBF require an external MOSFET for 5A operation?
No, the LT1070IT#PBF integrates a 5A/75V DMOS power switch on-die. No external MOSFET is required for operation up to its rated switch current. External switches may be added only for higher power or specialized topologies beyond the IC's internal capability.
How does flyback regulation mode work on the LT1070IT#PBF?
Flyback regulation mode is activated when the FB pin voltage drops below 0.45V. In this mode, the LT1070IT#PBF uses its internal 16.3V flyback reference and dedicated flyback error amplifier to regulate the amplitude of the reflected flyback pulse - enabling precise, optocoupler-free isolation without secondary-side feedback components.
What is the purpose of the VC pin on the LT1070IT#PBF?
The VC pin on the LT1070IT#PBF serves four functions: (1) error amplifier output for compensation network connection, (2) current limit adjustment via external clamp, (3) soft-start initiation via capacitor coupling, and (4) shutdown activation when pulled below 0.15V - reducing supply current to 50µA.
Can the LT1070IT#PBF synchronize to an external clock?
No, the LT1070IT#PBF does not support external clock synchronization. Its 40kHz oscillator is fixed-frequency and internally generated. The datasheet notes "Can be Externally Synchronized (Consult Factory)" only for custom versions - not applicable to the standard LT1070IT#PBF.
LT1070IT#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:
- -40°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- TO-220-5
LT1070IT#PBF FAQ
1.How can I place an order for LT1070IT#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT1070IT#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 LT1070IT#PBF reliable?
The price and inventory of LT1070IT#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT1070IT#PBF is usually 5 days.
3.What payment methods are accepted for LT1070IT#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT1070IT#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT1070IT#PBF?
LT1070IT#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT1070IT#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 LT1070IT#PBF?
For technical support, including LT1070IT#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT1070IT#PBF requirements.
6.How does Aetrix verify that LT1070IT#PBF is sourced from the original manufacturer or authorized distributors?
All LT1070IT#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 LT1070IT#PBF meets industry standards.
7.What is the process for return or replacement of LT1070IT#PBF?
All LT1070IT#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LT1070IT#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 LT1070IT#PBF part is unused and in its original packaging.
Return procedure for LT1070IT#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
LT1070IT#PBF Tags
-
TPS562201DDCR
Texas Instruments
-
MC34063ABD-TR
STMicroelectronics
-
TPS561201DDCR
Texas Instruments
-
MC33063ADR
Texas Instruments
-
MC34063ADR
Texas Instruments
-
TPS560200DBVR
Texas Instruments
-
AP3012KTR-G1
Diodes Incorporated
-
TLV61048DBVR
Texas Instruments
-
AZ34063UMTR-G1
Diodes Incorporated
-
TPS562200DDCR
Texas Instruments
-
AP62300TWU-7
Diodes Incorporated
-
MC34063EBD-TR
STMicroelectronics
Tech Hub
A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.
The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…
The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…
A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…
A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …
An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…
Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…
An engineering guide to LED driver operation, constant-current and constant-voltage outputs, linear and switching topologies, dimming, IC selection, calculations, replacement compatibility, and fault c…
Operational amplifier guide covering op amp basics, feedback, ideal vs real op amps, common configurations, buffer circuits, offset, bias current, gain-bandwidth, slew rate, rail-to-rail limits and sel…
Jumper cables guide covering safe connection order, red and black clamp placement, final ground connection, cable gauge, length, clamp quality, copper vs CCA cables, jump starter comparison and battery…
