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Analog Devices Inc. LT1072IN8#PBF
- Part No.:
- LT1072IN8#PBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 8-DIP (0.300", 7.62mm)
- Datasheet:
-
LT1072IN8#PBF.pdf
- Description:
- IC REG BUCK BST ADJ 1.25A 8PDIP
- Quantity:
- Payment:
- Shipping:
Inventory:112
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Product details
Overview
LT1072IN8#PBF from Analog Devices (formerly Linear Technology) is a monolithic 1.25A current-mode switching regulator IC capable of buck, boost, flyback, forward, inverting, and Cuk topologies. It operates from 3V to 40V input, delivers up to 20W output power, features internal 1.25A switch with 0.6Ω typical RDS(on), 40kHz fixed-frequency oscillator, and 6mA quiescent current - used in offline converters, battery upconverters, and isolated dual-rail supplies.
For engineers reviewing the LT1072IN8#PBF datasheet, LT1072IN8#PBF pinout, LT1072IN8#PBF application, or LT1072IN8#PBF equivalent, key selection criteria include its wide 3–40V input range, flyback-regulated floating outputs without optocouplers, adaptive anti-saturation switch drive, shutdown mode drawing only 50µA, and compatibility with miniDIP-8 package for compact board layout.
Technical Context
The LT1072IN8#PBF 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 internal 2.3V low-dropout regulator powers all circuitry independently of input voltage variation.
It integrates oscillator, error amplifier (gm = 3000–6000 µmho), current-limit comparator, adaptive anti-saturation driver, and 1.24V bandgap reference. The FB pin serves dual roles: normal regulation at 1.244V reference, and flyback mode activation when pulled below 0.45V - enabling fully isolated outputs via transformer-coupled topology.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 3V to 40V - supports wide-input industrial, automotive, and battery-derived supplies without external pre-regulation. |
| Switch Current Limit | 1.25A typical (min 1.25A at 50% duty cycle, ≥25°C) - defines maximum continuous load capability in buck/boost configurations. |
| Reference Voltage | 1.244V ±20mV at FB pin - sets output voltage accuracy in standard feedback loops using resistor dividers. |
| Quiescent Current | 6mA typical - enables high efficiency at light loads; critical for standby-sensitive applications. |
| Shutdown Current | 50µA typical - reduces system-level standby power consumption significantly during inactive periods. |
| Switching Frequency | 40kHz ±5kHz - balances EMI, magnetics size, and efficiency; externally synchronizable to 48–70kHz. |
| Max Duty Cycle | 97% - allows high step-up ratios in boost/flyback designs with minimal dropout margin. |
Pinout & Package
N8 package: 8-pin narrow-body plastic DIP (0.300" width), through-hole mount, JEDEC MS-001 compatible. Thermal resistance θJA = 130°C/W - requires careful thermal design above ~0.3W dissipation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (E2) | Second emitter terminal | Optional connection; leaving open doubles RDS(on) and halves current limit - used for soft current limiting or thermal derating. |
| 2 (VSW) | Switch collector output | High-voltage switching node connected to inductor/diode; rated to 65V breakdown. |
| 3 (FB) | Feedback input | 1.244V reference point for output regulation; pulled low (<0.45V) enables flyback isolation mode. |
| 4 (NC) | No connect | Internally unused; must remain unconnected per datasheet. |
| 5 (E1) | Primary emitter terminal | Mandatory ground connection point - all internal emitters tied here; never left floating. |
| 6 (VC) | Error amplifier output / control | Current-source output used for compensation, soft-start, current limit adjustment, and shutdown (≤0.15V). |
| 7 (GND) | Power and signal ground | Common return for internal circuitry and external components; separate from E1/E2 for noise isolation. |
| 8 (VIN) | Input supply voltage | Accepts 3–40V; powers internal LDO and switch driver - no external bypass required beyond standard 0.1µF ceramic. |
Key Features
| Feature | Design Value |
|---|---|
| Flyback regulation mode | Enables fully isolated, optocoupler-free outputs by regulating flyback pulse amplitude - eliminates secondary-side sensing complexity. |
| Adaptive anti-saturation drive | Dynamically adjusts base drive to minimize switch saturation voltage and turn-off delay - improves efficiency across 10mA–1.25A load range. |
| Self-protection architecture | Integrates overcurrent, thermal foldback, and shutdown - eliminates need for external fault-handling circuitry in most designs. |
| Multi-topology support | Operates in buck, boost, flyback, forward, inverting, and Cuk configurations using same IC - reduces BOM count and design reuse effort. |
| External synchronization | Accepts 48–70kHz external clock via VC pin - enables EMI reduction through frequency dithering or system-level timing alignment. |
Applications
| Industrial Offline Power Supply | Battery-Powered DC-DC Upconverter |
|---|---|
Use Scenario: 24V AC/DC adapter powering PLC I/O modules with 12V/5V rails. IC Role / Device Role / Timing Role: Primary controller in flyback topology generating isolated 12V and 5V outputs from 85–265VAC rectified input. Use Value: Eliminates optocoupler and TL431, reducing component count by 3–4 parts while maintaining ±3% output regulation across line/load. | Use Scenario: Portable test equipment powered by 7.2V Li-ion battery requiring 12V analog rail and –12V op-amp supply. IC Role / Device Role / Timing Role: Dual-output inverting buck-boost regulator delivering ±12V at 250mA each from single-cell input. Use Value: Achieves >82% efficiency at full load with no external MOSFETs - extends battery runtime by 18% vs. linear solution. |
| Isolated Medical Sensor Interface | Automotive Body Control Module Supply |
Use Scenario: EEG front-end sensor with galvanic isolation between patient-connected analog stage and digital MCU side. IC Role / Device Role / Timing Role: Flyback-regulated isolated 3.3V supply referenced to patient-side ground, decoupled from system ground. Use Value: Meets IEC 60601-1 creepage/clearance requirements using standard 5kV-rated transformer - no safety-certified DC-DC module needed. | Use Scenario: 12V vehicle battery powering 5V microcontroller and 3.3V CAN transceiver in door module. IC Role / Device Role / Timing Role: Buck converter with 3V–40V input range tolerating cold-crank (6.5V) and load-dump (40V) transients without reset. Use Value: Maintains regulation during 10ms 35V load-dump event - prevents MCU brownout and preserves CAN communication integrity. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar switching regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LT1071CN8#PBF | 2.5A switch current rating, identical pinout and feature set - higher current capacity but larger die and thermal footprint. | Preferred for >1.25A continuous loads (e.g., 5V@2A logic supply); requires larger heatsinking in N8 package. | Select when output current exceeds 1.25A and board space permits higher power dissipation. |
| LM2576HVSX-5.0/NOPB | Fixed 5V output, 3A switch, 52kHz frequency, no flyback mode - simpler but less flexible topology support. | Suitable for non-isolated 5V buck supplies only; lacks multi-topology and floating output capability. | Choose for cost-sensitive, single-rail 5V applications where isolation and adjustable VOUT are unnecessary. |
Compared with LT1071CN8#PBF and LM2576HVSX-5.0/NOPB, the LT1072IN8#PBF uniquely balances 1.25A capability with full topology flexibility and flyback isolation - making it optimal for space-constrained, multi-rail, or safety-isolated designs where programmability matters more than raw current headroom.
Availability
LT1072IN8#PBF is available at Aetrix Electronics and suitable for industrial offline converters, battery-powered upconverters, isolated sensor interfaces, and automotive body control modules requiring stable component supply across extended temperature and voltage ranges.
Supply support for LT1072IN8#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, inheriting its legacy of high-performance analog and power management ICs designed for precision, reliability, and rugged operation.
The LT1072 product line was engineered for high-efficiency, wide-input switching regulation in harsh environments - targeting applications where integration, topology flexibility, and robust protection outweigh cost sensitivity.
FAQ
What is the maximum input voltage rating for the LT1072IN8#PBF?
The LT1072IN8#PBF has an absolute maximum input voltage of 40V, with recommended operating range from 3V to 40V. Exceeding 40V risks switch breakdown (rated at 65V min, but derated for reliability). For 60V-capable operation, the LT1072HV variant must be selected - the LT1072IN8#PBF is not rated for inputs above 40V.
Can the LT1072IN8#PBF generate isolated outputs without an optocoupler?
Yes, the LT1072IN8#PBF supports flyback-regulated mode: pulling the FB pin below 0.45V disconnects the main error amplifier and activates the flyback amplifier, allowing regulation of transformer-coupled outputs without optocouplers or secondary-side references. This enables fully floating outputs up to transformer breakdown limits.
What is the purpose of the E1 and E2 pins on the LT1072IN8#PBF?
E1 is the mandatory emitter ground connection; E2 is an auxiliary emitter terminal. Leaving E2 unconnected doubles the switch's on-resistance and halves the current limit - a deliberate method to reduce peak stress and improve thermal margin in lower-current designs without changing external components.
How does the LT1072IN8#PBF achieve current-mode control?
The LT1072IN8#PBF senses switch current directly and terminates each oscillator cycle when that current reaches a level set by the VC pin voltage. This current-mode architecture provides inherent cycle-by-cycle current limiting, improved line transient response, and simplified loop compensation versus voltage-mode controllers.
Is the LT1072IN8#PBF RoHS compliant and lead-free?
Yes, the LT1072IN8#PBF is RoHS compliant and features lead-free (Pb-free) finish per JEDEC J-STD-609. The "#PBF" suffix explicitly denotes lead-free packaging - confirmed by Analog Devices' official product change notices and material declarations.
LT1072IN8#PBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 8-DIP (0.300", 7.62mm)
- 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):
- 40V
- Voltage - Output (Min/Fixed):
- 1.25V
- Voltage - Output (Max):
- 65V (Switch)
- Current - Output:
- 1.25A (Switch)
- Frequency - Switching:
- 40kHz
- Synchronous Rectifier:
- No
- Operating Temperature:
- -40°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- 8-PDIP
LT1072IN8#PBF FAQ
1.How can I place an order for LT1072IN8#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT1072IN8#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 LT1072IN8#PBF reliable?
The price and inventory of LT1072IN8#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT1072IN8#PBF is usually 5 days.
3.What payment methods are accepted for LT1072IN8#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT1072IN8#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT1072IN8#PBF?
LT1072IN8#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT1072IN8#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 LT1072IN8#PBF?
For technical support, including LT1072IN8#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT1072IN8#PBF requirements.
6.How does Aetrix verify that LT1072IN8#PBF is sourced from the original manufacturer or authorized distributors?
All LT1072IN8#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 LT1072IN8#PBF meets industry standards.
7.What is the process for return or replacement of LT1072IN8#PBF?
All LT1072IN8#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LT1072IN8#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 LT1072IN8#PBF part is unused and in its original packaging.
Return procedure for LT1072IN8#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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