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Analog Devices Inc. LT1269CSW#TRPBF
- Part No.:
- LT1269CSW#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 20-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
LT1269CSW#TRPBF.pdf
- Description:
- IC REG BUCK BOOST ADJ 4A 20SO
- Quantity:
- Payment:
- Shipping:
Inventory:1,096
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Product details
Overview
LT1269CSW#TRPBF from Analog Devices (formerly Linear Technology) is a monolithic 100kHz high-efficiency switching regulator with an integrated 4A power switch, designed for buck, boost, flyback, and inverting configurations. It operates from 3.5V to 30V input, delivers up to ~3.5A output current in buck mode, features 1.244V reference voltage, 7mA quiescent current, and shutdown mode drawing only 100µA - used in PC power supplies with multiple outputs and battery up-converters.
For engineers reviewing the LT1269CSW#TRPBF datasheet, LT1269CSW#TRPBF pinout, LT1269CSW#TRPBF application, or LT1269CSW#TRPBF equivalent, key selection criteria include its 100kHz switching frequency, internal 4A switch, flyback-regulated floating output capability, adaptive antisaturation drive, and compatibility with standard TO-220, DD, and wide SO-20 packages.
Technical Context
The LT1269CSW#TRPBF implements current-mode control with a patented adaptive antisaturation switch drive, enabling stable operation across wide load ranges without efficiency loss. Its error amplifier offers 4400 µmho transconductance and 800 V/V gain, supporting precise regulation under dynamic line and load conditions.
It supports external synchronization (per LT1072 datasheet), includes flyback-specific circuitry with 16.3V flyback reference voltage and 300 µmho flyback amplifier transconductance, and provides fully floating outputs in flyback mode - distinct from standard buck/boost topologies.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Switching Frequency | 100kHz typical - enables smaller magnetics and reduced EMI vs. 60kHz LT1271 variant. |
| Internal Switch Current Limit | 4A minimum at 50% duty cycle - supports high-output-power DC/DC conversion without external MOSFET. |
| Reference Voltage | 1.244V ±20mV - sets output voltage accuracy in buck/boost via resistive divider on FB pin. |
| Quiescent Current | 7mA typical - minimizes no-load power loss in always-on industrial or automotive systems. |
| Shutdown Supply Current | 100µA typical - enables ultra-low-power standby in battery-powered applications. |
| Flyback Reference Voltage | 16.3V typical - enables isolated output regulation without optocoupler in flyback designs. |
| Switch On-Resistance | 0.33Ω max - limits conduction loss and thermal rise at full 4A load. |
Pinout & Package
LT1269CSW#TRPBF is housed in a 20-lead plastic wide SO (SW) package (0.300" body width), with exposed thermal pad for enhanced heat dissipation. Pin 1 is marked by notch or cavity per JEDEC MS-013.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN | Input Power Supply | Accepts 3.5V–30V unregulated input; connects to bulk capacitor and EMI filter. |
| VSW | Switch Output | Drives external inductor/diode in buck/boost; connects to transformer primary in flyback. |
| GND | Power Ground | Common return for switch, feedback, and control circuits; requires low-inductance layout. |
| FB | Feedback Input | Senses output voltage divider; regulates to 1.244V reference in non-flyback modes. |
| VC | Control Voltage | Adjusts duty cycle and enables shutdown when pulled below 0.5V; also used for burst mode. |
Key Features
| Feature | Design Value |
|---|---|
| Wide Input Range (3.5V–30V) | Supports 5V, 12V, and 24V rail inputs without pre-regulation - simplifies multi-rail system design. |
| Self-Protected Overload Handling | Integrates overcurrent, thermal, and short-circuit protection - eliminates need for external fault management circuitry. |
| Floating Flyback Outputs | Enables isolated dual-polarity or multi-output supplies without optocouplers or secondary-side controllers. |
| External Synchronization Capability | Allows clock alignment with other converters to reduce beat-frequency EMI in multi-rail power systems. |
| Adaptive Antisaturation Drive | Maintains high efficiency (>90% at 0.4A–1.5A) across 100:1 load range - critical for variable-load embedded systems. |
Applications
| PC Power Supply with Multiple Outputs | Battery Up-Converter |
|---|---|
Use Scenario: Generating +5V, +12V, and –12V rails from a single 12V ATX input in compact desktop or embedded PC motherboards. IC Role / Device Role / Timing Role: Primary controller in flyback topology with floating secondaries - regulates all outputs simultaneously using single feedback loop. Use Value: Eliminates need for multiple regulators or optocouplers; achieves >90% efficiency at mid-load while maintaining tight cross-regulation. | Use Scenario: Boosting 3.7V Li-ion battery voltage to 5V/9V/12V for USB peripherals or portable instrumentation. IC Role / Device Role / Timing Role: High-current boost converter core - drives external inductor and Schottky diode with internal 4A switch. Use Value: Delivers up to 3A at 5V from single-cell input with minimal external components and 7mA quiescent draw in active mode. |
| Negative-to-Positive Converter | High Efficiency Buck Converter |
Use Scenario: Converting –12V legacy supply to +5V logic rail in industrial PLC backplanes or telecom line cards. IC Role / Device Role / Timing Role: Inverting buck-boost controller - uses VSW and GND pins to invert polarity while regulating output voltage. Use Value: Achieves 1.5A at +12V from –12V input with <0.3V dropout in normal run mode; avoids discrete transistor-based inverter stages. | Use Scenario: Stepping down 24V industrial bus to 5V/3.3V for microcontrollers and sensors in factory automation nodes. IC Role / Device Role / Timing Role: Fixed-frequency synchronous-capable buck controller - operates at 100kHz to minimize inductor size and EMI filtering. Use Value: Supports 3.5A output current (≈3.5A × VOUT) with 0.33Ω RDS(on), enabling compact 12mm × 12mm PCB footprint for high-density designs. |
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 |
|---|---|---|---|
| LT1374CS8#TRPBF | 500kHz switching frequency, 4.5A switch, SO-8 package, VIN ≤ 25V | Better suited for space-constrained buck-only designs requiring higher frequency and lower input voltage | Select when board area is limited and input stays ≤25V; not suitable for flyback or >30V inputs. |
| LT1171CT#TRPBF | 100kHz, 2.5A switch, TO-220-5 package, wider 3.5V–40V input range | Lower current rating but higher input voltage tolerance - ideal for 36V automotive or PoE-powered systems | Choose for 36V+ inputs where 2.5A output suffices; lacks flyback reference voltage support. |
Compared with LT1374CS8#TRPBF and LT1171CT#TRPBF, the LT1269CSW#TRPBF uniquely balances 4A current capability, 100kHz operation, flyback isolation support, and 30V input - making it optimal for multi-topology, medium-power industrial power supplies where flexibility and component count reduction are critical.
Availability
LT1269CSW#TRPBF is available at Aetrix Electronics and suitable for PC power supplies with multiple outputs, battery up-converters, negative-to-positive converters, and high-efficiency buck converters requiring stable component supply and long-term industrial availability.
Supply support for LT1269CSW#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 its portfolio of high-performance analog and power management ICs with emphasis on reliability, precision, and ruggedness.
The LT1269CSW#TRPBF belongs to Linear's legacy monolithic switching regulator family, engineered for robust, low-component-count DC/DC conversion in industrial, telecom, and computing applications where thermal resilience and topology flexibility are essential.
FAQ
What is the maximum input voltage rating for the LT1269CSW#TRPBF?
The LT1269CSW#TRPBF has an absolute maximum supply voltage rating of 30V, with recommended operating range from 3.5V to 30V. Exceeding 30V risks permanent damage to the internal switch and control circuitry. The device's 60V switch breakdown voltage (BV) provides margin against transient spikes but does not extend safe continuous operation beyond 30V.
Does the LT1269CSW#TRPBF support flyback topology with isolated outputs?
Yes, the LT1269CSW#TRPBF explicitly supports flyback mode with fully floating outputs. Its dedicated flyback reference voltage (16.3V typical) and flyback amplifier transconductance (300 µmho) enable regulation of isolated secondaries without optocouplers - confirmed in the datasheet's "Flyback Regulated Mode Has Fully Floating Outputs" feature and TA04 application circuit.
What package type is used for the LT1269CSW#TRPBF?
The LT1269CSW#TRPBF uses a 20-lead plastic wide SO (SW) package (0.300" body width), distinct from the 5-lead TO-220 (T) and DD (Q) variants. This package includes multiple GND pins and an exposed thermal pad, optimized for thermal performance in high-current switching applications.
Can the LT1269CSW#TRPBF be synchronized to an external clock?
Yes, the LT1269CSW#TRPBF supports external synchronization as noted in the datasheet: "Can Be Externally Synchronized (See LT1072 Data Sheet)." The VC pin accepts external timing signals to align switching frequency - useful for reducing beat-frequency noise in multi-converter systems.
What is the typical efficiency of the LT1269CSW#TRPBF in boost configuration?
In boost configuration delivering 5V at 0.4A–1.5A from a 6.5V–25V input, the LT1269CSW#TRPBF achieves approximately 90% efficiency, as verified in the "High Efficiency 5V Regulator with Burst Mode™ Operation" typical application (TA01) and related efficiency graphs. Efficiency drops at light loads due to fixed switching losses but remains >85% down to 100mA.
LT1269CSW#TRPBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 20-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, Buck-Boost, Flyback
- Output Type:
- Adjustable
- Number of Outputs:
- 1
- Voltage - Input (Min):
- 3.5V
- Voltage - Input (Max):
- 30V
- Voltage - Output (Min/Fixed):
- 1.244V
- Voltage - Output (Max):
- 60V (Switch)
- Current - Output:
- 4A (Switch)
- Frequency - Switching:
- 100kHz
- Synchronous Rectifier:
- No
- Operating Temperature:
- 0°C ~ 100°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 20-SO
LT1269CSW#TRPBF FAQ
1.How can I place an order for LT1269CSW#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT1269CSW#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 LT1269CSW#TRPBF reliable?
The price and inventory of LT1269CSW#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT1269CSW#TRPBF is usually 5 days.
3.What payment methods are accepted for LT1269CSW#TRPBF?
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4.How is shipping managed for LT1269CSW#TRPBF?
LT1269CSW#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT1269CSW#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 LT1269CSW#TRPBF?
For technical support, including LT1269CSW#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT1269CSW#TRPBF requirements.
6.How does Aetrix verify that LT1269CSW#TRPBF is sourced from the original manufacturer or authorized distributors?
All LT1269CSW#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 LT1269CSW#TRPBF meets industry standards.
7.What is the process for return or replacement of LT1269CSW#TRPBF?
All LT1269CSW#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LT1269CSW#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 LT1269CSW#TRPBF part is unused and in its original packaging.
Return procedure for LT1269CSW#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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