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Analog Devices Inc. LT1072CSW#TRPBF
- Part No.:
- LT1072CSW#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 16-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
LT1072CSW#TRPBF.pdf
- Description:
- IC REG BUCK BOOST ADJ 1.25A 16SO
- Quantity:
- Payment:
- Shipping:
Inventory:1,313
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Product details
Overview
LT1072CSW#TRPBF from Analog Devices (formerly Linear Technology) is a monolithic 40kHz current-mode switching regulator IC with an integrated 1.25A/65V power switch, operating from 3V to 40V input and delivering up to 20W output power in buck, boost, flyback, forward, inverting, and Cuk topologies. It features 6mA quiescent current, internal flyback regulation mode for fully floating isolated outputs, and shutdown mode drawing only 50µA.
For engineers reviewing the LT1072CSW#TRPBF datasheet, LT1072CSW#TRPBF pinout, LT1072CSW#TRPBF application, or LT1072CSW#TRPBF equivalent, key selection criteria include its wide 3–40V input range, 1.25A internal switch current limit, flyback-regulated isolation capability without optocouplers, and compatibility with standard switching topologies requiring minimal external components.
Technical Context
The LT1072CSW#TRPBF implements current-mode control with adaptive anti-saturation drive for stable operation across wide load currents. Its oscillator runs at 40kHz (±5kHz), and it uses a 1.244V bandgap reference with ±0.02V tolerance over temperature for precise feedback regulation.
It supports dual regulation modes: normal voltage-mode via FB pin (1.244V reference) and flyback-regulated mode activated by pulling FB below 0.45V, enabling transformer-coupled isolated outputs with 16.3V flyback reference voltage and built-in leakage spike blanking.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 3V to 40V - supports wide industrial and battery-derived supplies without external pre-regulation. |
| Switch Current Limit | 1.25A typical at 25°C - sets maximum deliverable output power and enables robust overload protection. |
| Reference Voltage | 1.244V ±20mV - defines regulated output accuracy in non-flyback configurations; used directly in feedback divider design. |
| Quiescent Current | 6mA - enables high efficiency at light loads and low standby power consumption. |
| Shutdown Current | 50µA - allows ultra-low-power standby in battery-powered systems. |
| Switch Breakdown Voltage | 65V - determines maximum allowable switch node voltage swing in boost/flyback topologies. |
| Switching Frequency | 40kHz ±5kHz - balances EMI, inductor size, and efficiency; externally synchronizable to 48–70kHz. |
Pinout & Package
LT1072CSW#TRPBF is housed in a 16-lead plastic SO wide (SW) package with exposed thermal pad, rated for 100°C max junction temperature and θJA = 130°C/W. Pin 1 is marked with notch or dot; package meets JEDEC MS-013AC.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN | Power Input | Primary supply connection; must be decoupled near pin with ≥1µF ceramic capacitor. |
| VSW | Switch Output | Drives external inductor/diode; connects to primary side of transformer in flyback mode. |
| GND | Ground Reference | Analog and power ground return; requires low-impedance layout to minimize noise coupling. |
| VC | Error Amplifier Output / Control | Provides compensation node, soft-start, current limit adjustment, and shutdown control (≤0.15V). |
| FB | Feedback Input | Accepts resistor divider voltage; <0.45V selects flyback regulation mode; 1.244V target in normal mode. |
| E1, E2 | Emitter Terminals | E1 must connect to GND; E2 optional-open E2 reduces switch current limit by 2× but doubles RDS(on). |
| NC | No Connect | Pins 1–4, 6–8, 10–12, 14–15 are internally unused; leave unconnected or tie to GND per layout best practice. |
Key Features
| Feature | Design Value |
|---|---|
| Flyback-regulated isolation mode | Enables fully floating, optocoupler-free multiple-output converters using transformer secondary winding feedback. |
| Adaptive anti-saturation switch drive | Maintains high efficiency across 0.1A–1.25A load range by dynamically adjusting gate drive to prevent transistor saturation. |
| Current-mode control architecture | Delivers immediate line transient response, simplifies loop compensation, and provides inherent cycle-by-cycle current limiting. |
| External synchronization capability | Accepts 48–70kHz external clock via VC pin pull-down, enabling EMI reduction through frequency dithering or system-level timing alignment. |
| Self-protected overload handling | Integrates thermal foldback and current-limit shutdown-no external sensing or protection circuitry required. |
Applications
| Industrial Power Supply | Battery-Powered DC-DC Conversion |
|---|---|
Use Scenario: Generating isolated ±15V op-amp rails from a 24V industrial bus. IC Role / Device Role / Timing Role: Primary-side controller in flyback topology regulating secondary outputs without optocouplers. Use Value: Eliminates optocoupler cost and aging drift while maintaining tight cross-regulation across dual outputs. | Use Scenario: Boosting 3.6V Li-ion battery to 12V for portable instrumentation. IC Role / Device Role / Timing Role: High-efficiency boost converter with 6mA quiescent current preserving battery life during sleep. Use Value: Delivers >85% efficiency at 100mA load and extends runtime by minimizing no-load drain. |
| Offline AC-DC Adapter | Isolated Sensor Interface Power |
Use Scenario: 50W offline flyback converter powering embedded control logic from rectified 100–240VAC. IC Role / Device Role / Timing Role: Primary-side controller with 65V switch rating supporting 300VDC bulk input with margin. Use Value: Enables compact design with minimal external components and no auxiliary winding for bias supply. | Use Scenario: Providing galvanically isolated 5V/100mA power for analog sensor front-ends in noisy motor drives. IC Role / Device Role / Timing Role: Flyback regulator generating floating supply referenced to sensor ground, not system ground. Use Value: Prevents ground-loop noise injection into precision analog measurements via true isolation. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar switching regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LT1071CT#TRPBF | 2.5A switch current limit, same 40V max input, TO-220-5 package only - higher current but larger footprint and no SW package option. | Suitable for higher-power (>25W) non-isolated buck/boost designs where board space permits TO-220 mounting. | Select when output current exceeds 1.25A and thermal management allows TO-220 package; not drop-in due to different pinout and package. |
| LM2576HVSX-5.0/NOPB | Fixed 5V output, 3A switch, 52V max input, 52kHz fixed frequency - no flyback mode, no VC pin control, simpler but less flexible. | Ideal for cost-sensitive, fixed-output 5V point-of-load conversion without isolation requirements. | Choose for simplified 5V-only designs where flyback regulation, adjustable output, or shutdown control are unnecessary. |
Compared with LT1071CT#TRPBF and LM2576HVSX-5.0/NOPB, the LT1072CSW#TRPBF uniquely combines surface-mount SW packaging, flyback isolation capability, and programmable regulation modes-making it optimal for space-constrained, multi-output, or isolated industrial power designs where flexibility outweighs fixed-output simplicity.
Availability
LT1072CSW#TRPBF is available at Aetrix Electronics and suitable for industrial power supplies, battery-powered DC-DC converters, and isolated sensor interface circuits requiring stable component supply, long-term lifecycle support, and traceable sourcing.
Supply support for LT1072CSW#TRPBF 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 LT1072 series.
The LT1072 product line was designed as a monolithic high-efficiency switching regulator family targeting industrial, telecom, and instrumentation power systems needing wide-input, multi-topology flexibility and integrated protection - especially where isolation, low quiescent current, and minimal external parts are critical.
FAQ
What is the maximum input voltage rating for the LT1072CSW#TRPBF?
The LT1072CSW#TRPBF has a maximum input voltage rating of 40V, as specified in the Absolute Maximum Ratings table. Exceeding this voltage risks permanent damage to the internal 65V-rated switch due to breakdown under transient conditions, particularly in buck or inverting topologies where minimum "on" time limits short-circuit withstand. For 60V operation, the LT1072HV variant must be used instead.
Does the LT1072CSW#TRPBF support flyback topology with isolated outputs?
Yes, the LT1072CSW#TRPBF supports flyback topology with fully isolated outputs via its dedicated flyback regulation mode. When the FB pin voltage is pulled below 0.45V, the IC switches to regulating the amplitude of the flyback pulse relative to VIN, enabling optocoupler-free isolated outputs up to the transformer's breakdown voltage. The flyback reference voltage is 16.3V with ±1.3V tolerance.
How does the VC pin function in the LT1072CSW#TRPBF?
The VC pin on the LT1072CSW#TRPBF serves four critical functions: (1) error amplifier output for compensation network connection, (2) current limit adjustment via external clamping, (3) soft-start control using a capacitor-coupled clamp, and (4) shutdown activation when pulled ≤0.15V (reducing supply current to 50µA). Its voltage ranges from ~0.9V (light load) to ~2.0V (heavy load) during normal operation.
Can the LT1072CSW#TRPBF be synchronized to an external clock?
Yes, the LT1072CSW#TRPBF can be externally synchronized to a 48–70kHz clock signal by pulling the VC pin to ground with a fast-switching transistor (e.g., bipolar or MOSFET) driven by the external clock. Pulse width must remain under 1µs to avoid disturbing DC error amplifier operation. Synchronization enables EMI reduction and system-level timing coordination without modifying internal oscillator components.
What is the purpose of the E1 and E2 pins on the LT1072CSW#TRPBF?
E1 and E2 are the two emitter terminals of the internal power switch. E1 must be connected to the GND pin; E2 is optional. Leaving E2 open reduces the switch current limit by 2× (to ~0.625A) and doubles RDS(on), which lowers dissipation during current-limit faults but increases conduction loss at normal loads. This feature allows trade-off between fault robustness and efficiency in space-constrained designs.
LT1072CSW#TRPBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 16-SOIC (0.295", 7.50mm Width)
- Packaging:
- Tape & Reel (TR)
- 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:
- 0°C ~ 100°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 16-SO
LT1072CSW#TRPBF FAQ
1.How can I place an order for LT1072CSW#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT1072CSW#TRPBF 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 LT1072CSW#TRPBF reliable?
The price and inventory of LT1072CSW#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT1072CSW#TRPBF is usually 5 days.
3.What payment methods are accepted for LT1072CSW#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT1072CSW#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT1072CSW#TRPBF?
LT1072CSW#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT1072CSW#TRPBF 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 LT1072CSW#TRPBF?
For technical support, including LT1072CSW#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT1072CSW#TRPBF requirements.
6.How does Aetrix verify that LT1072CSW#TRPBF is sourced from the original manufacturer or authorized distributors?
All LT1072CSW#TRPBF 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 LT1072CSW#TRPBF meets industry standards.
7.What is the process for return or replacement of LT1072CSW#TRPBF?
All LT1072CSW#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LT1072CSW#TRPBF, 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 LT1072CSW#TRPBF part is unused and in its original packaging.
Return procedure for LT1072CSW#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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