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Analog Devices Inc. LT1269CQ#TRPBF
- Part No.:
- LT1269CQ#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- TO-263-6, D2PAK (5 Leads + Tab), TO-263BA
- Datasheet:
-
LT1269CQ#TRPBF.pdf
- Description:
- IC REG BUCK BOOST ADJ 4A DDPAK-5
- Quantity:
- Payment:
- Shipping:
Inventory:4,906
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Product details
Overview
LT1269CQ#TRPBF from Analog Devices (formerly Linear Technology) is a monolithic 100kHz, 4A high-efficiency switching regulator in a 5-lead plastic DD package. It integrates a high-current switch, oscillator, control, and protection circuitry for buck, boost, flyback, and inverting configurations. With 3.5V–30V input range, 7mA quiescent current, and internal 4A switch, it delivers up to ~15W in buck mode (e.g., 5V/3A) and supports PC power supplies with multiple outputs.
For engineers reviewing the LT1269CQ#TRPBF datasheet, LT1269CQ#TRPBF pinout, LT1269CQ#TRPBF application, or LT1269CQ#TRPBF equivalent, key selection criteria include switching frequency (100kHz), maximum duty cycle (95%), flyback reference voltage (16.3V typ), thermal resistance (θJA = 30°C/W), and shutdown current (100µA).
Technical Context
The LT1269CQ#TRPBF uses current-mode switching control with adaptive anti-saturation switch drive to maintain efficiency across wide load ranges. Its error amplifier features 4400 µmho transconductance and 800 V/V gain, enabling precise regulation under dynamic line/load conditions.
It supports flyback-regulated mode with fully floating outputs and a dedicated 16.3V flyback reference voltage. External synchronization capability (per LT1072 datasheet) allows system-level clock alignment, while shutdown threshold (0.9V typ on VC pin) enables low-power standby operation.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Switching Frequency | 100kHz typical - sets minimum inductor size and EMI profile for compact, efficient designs. |
| Max Switch Current | 4A guaranteed at 50% duty cycle - enables ≥3A continuous output in buck mode with margin. |
| Input Voltage Range | 3.5V to 30V - supports 5V, 12V, and 24V industrial rails without external pre-regulation. |
| Quiescent Current | 7mA typical - minimizes no-load power loss in always-on systems like battery backup supplies. |
| Flyback Reference | 16.3V typical - defines regulated output voltage in isolated flyback topologies using feedback winding. |
| Shutdown Current | 100µA typical - ensures ultra-low standby consumption for energy-sensitive applications. |
| Thermal Resistance θJA | 30°C/W - achieved with DD package copper heat sink; enables 100°C junction temp at ~2.3W dissipation with minimal PCB copper. |
Pinout & Package
LT1269CQ#TRPBF is housed in a 5-lead plastic DD (Dual Drain) package with exposed copper heat sink on bottom. The package provides low thermal resistance (θJA = 30°C/W) and is optimized for surface-mount assembly with solderable drain terminals.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN | Power Input | Connects to unregulated DC input (3.5V–30V); must be bypassed near pin with ≥0.1µF ceramic + bulk capacitor. |
| VSW | Switch Output | Drives external inductor/diode; connects to drain of integrated 4A N-channel MOSFET switch. |
| GND | Power Ground | Common return for switch, error amp, and internal circuits; requires low-inductance connection to PCB ground plane. |
| FB | Feedback Input | Senses output voltage via resistor divider; regulates to 1.244V reference (buck) or 16.3V (flyback). |
| VC | Control Voltage | Accepts 0.5–1.5V control signal; <0.3V = shutdown, >0.9V = normal operation, open = Burst Mode™. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated 4A Power Switch | Eliminates external MOSFET and gate driver, reducing BOM count and layout complexity in 3–5A converters. |
| Current-Mode Control | Provides inherent cycle-by-cycle current limiting and excellent transient response without external compensation. |
| Flyback-Regulated Mode | Enables fully floating, isolated outputs without optocoupler or secondary-side regulation ICs. |
| Adaptive Anti-Saturation Drive | Maintains consistent switch efficiency from light to full load by dynamically adjusting gate drive strength. |
| Burst Mode™ Operation | Reduces light-load efficiency drop-off by pulsing full-power cycles instead of linearly scaling frequency. |
Applications
| PC Power Supply with Multiple Outputs | Battery Up-Converter |
|---|---|
Use Scenario: Desktop or embedded PC motherboard requiring +5V, +12V, and –12V rails from a single 12V or 24V input. IC Role / Device Role / Timing Role: Primary controller in multi-output flyback or buck-boost topology; regulates each rail via separate feedback windings or dividers. Use Value: Single-chip solution replaces discrete controllers + MOSFETs, achieving >90% efficiency at 1.5A per rail with no optocouplers needed in flyback mode. | Use Scenario: Portable medical device using two 3.7V Li-ion cells (7.4V nominal) needing regulated 12V for display backlight or sensor bias. IC Role / Device Role / Timing Role: Boost converter controller driving external inductor and Schottky diode to step up battery voltage. Use Value: Delivers 12V/0.5A from 7–8.4V input with 7mA quiescent current, extending runtime versus linear solutions. |
| Negative-to-Positive Converter | High Efficiency Buck Converter |
Use Scenario: Industrial I/O module with –12V field bus supply requiring clean +5V for logic and ADC reference. IC Role / Device Role / Timing Role: Inverting buck-boost controller converting negative input to positive output using grounded inductor configuration. Use Value: Achieves 1.5A @ +5V from –12V input with <0.3V ripple, eliminating need for dual-polarity input or charge-pump ICs. | Use Scenario: FPGA core voltage supply in telecom equipment requiring tightly regulated 1.2V/3A from 5V intermediate rail. IC Role / Device Role / Timing Role: Synchronous-capable buck controller (with external high-side FET) delivering precise 1.2V via FB divider and VC-based current limit. Use Value: Supports 3A continuous load with 1.244V ±20mV reference accuracy and 92% peak efficiency at 100kHz switching. |
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, 4.5A switch, SO-8 package, VIN ≤ 25V | Better suited for space-constrained, high-frequency designs; lacks flyback reference and floating output support | Choose for higher density and faster transient response where input ≤25V and isolation not required. |
| LT1171CT#TRPBF | 100kHz, 2.5A switch, TO-220 package, wider VIN (up to 40V) | Lower current rating limits output power; same pinout but reduced thermal performance (θJA = 50°C/W) | Choose when input exceeds 30V or cost sensitivity outweighs 4A capability and DD-package thermal advantage. |
Compared with LT1269CQ#TRPBF, LT1374CS8#TRPBF offers higher frequency and smaller footprint but sacrifices flyback capability and 30V+ input support; LT1171CT#TRPBF retains 100kHz operation and higher VIN range but trades 4A current and 30°C/W thermal performance for lower cost and legacy compatibility.
Availability
LT1269CQ#TRPBF is available at Aetrix Electronics and suitable for PC power supplies, battery-powered instrumentation, industrial I/O modules, and FPGA core voltage regulation requiring stable component supply and long-term manufacturability.
Supply support for LT1269CQ#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. Linear's legacy switching regulators are widely deployed in industrial, telecom, and computing applications.
The LT1269 belongs to Linear's monolithic high-current switching regulator product line, designed for robust, low-component-count DC/DC conversion in demanding environments where reliability, thermal efficiency, and topology flexibility (buck/boost/flyback/inverting) are critical.
FAQ
What is the maximum duty cycle supported by the LT1269CQ#TRPBF?
The LT1269CQ#TRPBF supports a maximum switch duty cycle of 95%, which enables high step-down ratios in buck configurations and extended conduction time in flyback topologies. This specification is guaranteed over temperature and ensures reliable operation when designing for worst-case input/output voltage combinations. The LT1269CQ#TRPBF datasheet specifies 80–95% depending on operating conditions, with 90% typical at room temperature.
Does the LT1269CQ#TRPBF require an external diode in boost configuration?
Yes, the LT1269CQ#TRPBF requires an external Schottky diode (e.g., MBR340) in boost configuration to provide the output rectification path, as its internal switch is a single N-channel MOSFET. The diode must handle peak currents up to 4A and reverse voltages exceeding the output voltage plus input voltage. The LT1269CQ#TRPBF does not integrate a synchronous rectifier, so conduction losses depend on diode forward voltage and thermal design.
Can the LT1269CQ#TRPBF be used in flyback mode with primary-side regulation only?
Yes, the LT1269CQ#TRPBF supports primary-side regulated flyback operation using its dedicated 16.3V flyback reference voltage on the FB pin. This eliminates the need for optocouplers or secondary-side TL431 circuits. The LT1269CQ#TRPBF senses reflected output voltage directly from the transformer auxiliary winding, enabling fully isolated, low-component-count designs with ±5% output accuracy under varying loads.
What is the thermal performance difference between the LT1269CQ#TRPBF and LT1269CT#TRPBF packages?
The LT1269CQ#TRPBF (DD package) has θJA = 30°C/W, while the LT1269CT#TRPBF (TO-220) has θJA = 50°C/W - a 40% improvement in thermal resistance. This allows the LT1269CQ#TRPBF to dissipate ~2.3W at 100°C junction temperature with minimal PCB copper, whereas the CT version requires significantly more heatsinking or derating. Both share identical electrical specs, but the Q package enables higher power density in surface-mount applications.
Is the LT1269CQ#TRPBF pin-compatible with the LT1271CQ#TRPBF?
Yes, the LT1269CQ#TRPBF and LT1271CQ#TRPBF are pin-compatible and functionally identical except for switching frequency (100kHz vs. 60kHz) and minor differences in max duty cycle and switch saturation voltage. Both use the same 5-pin DD package, pinout, and application circuits. Designers may substitute LT1269CQ#TRPBF for LT1271CQ#TRPBF when higher frequency operation is needed to reduce inductor size or improve transient response.
LT1269CQ#TRPBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- TO-263-6, D2PAK (5 Leads + Tab), TO-263BA
- 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:
- DDPAK-5
LT1269CQ#TRPBF FAQ
1.How can I place an order for LT1269CQ#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT1269CQ#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 LT1269CQ#TRPBF reliable?
The price and inventory of LT1269CQ#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT1269CQ#TRPBF is usually 5 days.
3.What payment methods are accepted for LT1269CQ#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT1269CQ#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT1269CQ#TRPBF?
LT1269CQ#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT1269CQ#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 LT1269CQ#TRPBF?
For technical support, including LT1269CQ#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT1269CQ#TRPBF requirements.
6.How does Aetrix verify that LT1269CQ#TRPBF is sourced from the original manufacturer or authorized distributors?
All LT1269CQ#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 LT1269CQ#TRPBF meets industry standards.
7.What is the process for return or replacement of LT1269CQ#TRPBF?
All LT1269CQ#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LT1269CQ#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 LT1269CQ#TRPBF part is unused and in its original packaging.
Return procedure for LT1269CQ#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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