LT1076CQ - 2A Step-Down Switching Regulator | Analog Devices
MPN: LT1076CQ β Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $5.23 | $5.23 |
| 10 | $4.85 | $48.50 |
| 100 | $4.2 | $420.00 |
| 500 | $3.75 | $1,875.00 |
| 1,000 | $3.4 | $3,400.00 |
Drop-in alternatives for LT1076CQ β same package, pin-to-pin compatible. Different-package parts requiring PCB rework are excluded.
Quick Comparison Tool β Select alternative parts for side-by-side comparison:
LT1076CQ#PBF
β Drop-Inπ Reference alternative (not in catalog)
LT1076CQ#TR
β Drop-Inπ Reference alternative (not in catalog)
LT1076CQ-5
β Drop-Inπ Reference alternative (not in catalog)
LT1074CQ
β Drop-Inπ Reference alternative (not in catalog)
LM2576T-ADJ
β Drop-Inπ Reference alternative (not in catalog)
LT1076CQ Maximum Ratings & Electrical Characteristics
| Output Type | Adjustable |
| Output Voltage Range | 2.5V to [DATA_NEEDED: max output voltage] |
| Maximum Switch Current | 2A |
| Input Voltage Range | Up to 60V |
| Switching Frequency | 100kHz |
| Quiescent Current | 8.5mA |
| Current Limit | 2.6A (programmable) |
| Topology | Buck, Boost, Flyback |
| Package | TO-263-6 (D2PAK, 5 Leads + Tab) |
| Mounting Type | Surface Mount |
| Operating Temperature | [DATA_NEEDED: operating temperature range] |
| Shutdown | Micropower shutdown |
| Number of Outputs | 1 |
| RoHS Status | Compliant (LT1076CQ#PBF) |
| Lead-Free | Yes (LT1076CQ#PBF) |
LT1076CQ Pin Configuration
| Pin 1 | VSW β Switch output |
| Pin 2 | VIN β Input supply |
| Pin 3 | GND β Ground |
| Pin 4 | FB β Feedback |
| Pin 5 | ILIM β Current limit adjust |
| Pin Tab | GND β Ground (exposed pad) |
Safe Operating Area (SOA) & Thermal Characteristics
No official SOA curve available for this component. Always operate within absolute maximum ratings specified in the datasheet. Ensure adequate cooling and derate as needed.
Typical Applications
LT1076CQ is suitable for 6 applications: Industrial Power Supplies, Battery Chargers, Telecom Equipment, Distributed Power Systems, Automotive Electronics, Negative Voltage Generation.
Industrial Power Supplies
The LT1076CQ is ideal for industrial power supplies that require step-down conversion from 24V or 48V rails. Its 60V input voltage capability and 2A switch current make it suitable for powering control circuits, sensors, and actuators in factory automation systems. The 100kHz switching frequency allows for compact inductor and capacitor sizes, reducing board space. The device's high efficiency minimizes heat dissipation, which is critical in enclosed industrial enclosures. The programmable current limit provides flexibility for different load requirements, and the micropower shutdown feature helps save energy in standby modes.
Recommended
Battery Chargers
The LT1076CQ can be used in battery charger circuits for lead-acid or lithium-ion batteries. Its buck topology efficiently steps down a higher input voltage to the required charging voltage. The adjustable output voltage allows precise control of the charging profile. The 2A switch current is suitable for charging medium-capacity batteries. The device's current limit feature can be programmed to provide constant-current charging. The wide input voltage range accommodates various power sources, including solar panels and AC adapters. The high efficiency reduces heat generation, which is important for portable charging applications.
Recommended
Telecom Equipment
In telecom equipment, the LT1076CQ provides efficient step-down conversion from 48V backplane voltages to lower logic and interface voltages. Its 60V input rating directly handles 48V telecom rails with adequate margin. The 100kHz switching frequency enables the use of small, low-profile inductors, which is beneficial in dense telecom line cards. The device's high efficiency reduces power loss and thermal stress, improving system reliability. The flyback topology capability allows generation of isolated or negative supplies if needed. The programmable current limit helps protect against overload conditions in telecom applications.
Recommended
Distributed Power Systems
The LT1076CQ is well-suited for distributed power architectures where a central bus voltage is converted to various local voltages. Its wide input range (up to 60V) allows it to be used in systems with 12V, 24V, or 48V buses. The adjustable output voltage enables generation of common logic voltages like 3.3V, 5V, or 12V. The device's high efficiency is crucial in distributed systems to minimize power loss across multiple conversion stages. The compact TO-263 package and minimal external component count simplify PCB layout. The micropower shutdown feature allows individual modules to be powered down when not in use, saving energy.
Recommended
Automotive Electronics
The LT1076CQ can be used in automotive electronics for step-down conversion from the 12V battery or 24V truck systems. Its 60V input rating provides ample margin for load dump transients, which can exceed 40V. The 100kHz switching frequency is above the AM radio band, reducing interference. The device's high efficiency helps manage heat in the engine compartment. The programmable current limit allows tailoring to specific loads like sensors, ECUs, or infotainment systems. The TO-263 package with exposed pad provides good thermal performance when mounted on a PCB with proper copper area.
Recommended
Negative Voltage Generation
The LT1076CQ can generate negative output voltages using the flyback topology, making it useful for applications requiring dual supplies, such as op-amp circuits or LCD bias supplies. The device's ability to operate as a positive-to-negative converter eliminates the need for a separate negative regulator. The adjustable output voltage allows precise setting of the negative rail. The 2A switch current provides sufficient power for most negative supply applications. The 100kHz switching frequency enables the use of small transformers or coupled inductors. The device's current limit protects against short circuits in the negative rail.
Recommended
Recommended Products Summary
Engineering reference data for LT1076CQ β comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | LT1076CQ#PBF | LT1076CQ#TR | LT1076CQ-5 | LT1074CQ | LM2576T-ADJ |
|---|---|---|---|---|---|---|
| Package | TO-263-6 (D2PAK) | TO-263-6 (D2PAK) - same | TO-263-6 (D2PAK) - same | TO-263-6 (D2PAK) - same | TO-263-6 (D2PAK) - same | TO-263-6 (D2PAK) - same |
| Brand | Analog Devices | Analog Devices | Analog Devices | Analog Devices | Analog Devices | Texas Instruments |
| Maximum Switch Current | 2A | 2A | 2A | 2A | 5A | 3A |
| Switching Frequency | 100kHz | 100kHz | 100kHz | 100kHz | 100kHz | 52kHz |
| Input Voltage Range | Up to 60V | Up to 60V | Up to 60V | Up to 60V | Up to 60V | Up to 40V |
| Output Voltage | Adjustable (2.5V min) | Adjustable (2.5V min) | Adjustable (2.5V min) | Fixed 5V | Adjustable (2.5V min) | Adjustable (1.23V min) |
| Quiescent Current | 8.5mA | 8.5mA | 8.5mA | 8.5mA | 8.5mA | 5mA |
| RoHS Compliant | No (standard) | Yes | No | No | No | Yes |
Key Differentiators
- Wide input voltage range up to 60V (vs LM2576T-ADJ)
- Higher switching frequency of 100kHz (vs LM2576T-ADJ)
- Programmable current limit (vs LT1074CQ)
Design Notes
For optimal thermal performance, solder the exposed pad (Tab) of the TO-263-6 package to a large copper area on the PCB. Use multiple thermal vias to connect the pad to the ground plane. This is critical for dissipating heat generated at high output currents. A minimum of 1 square inch of copper is recommended for 2A operation.
Select input and output capacitors with low ESR to minimize voltage ripple. For the LT1076CQ, a 100uF electrolytic capacitor on the input and a 100uF electrolytic capacitor on the output are typical. Add a 0.1uF ceramic capacitor in parallel for high-frequency decoupling. The inductor value should be chosen based on the switching frequency and output current to ensure continuous conduction mode.
Ensure the feedback resistor divider uses 1% tolerance resistors to maintain output voltage accuracy. The ILIM pin can be left open for the default 2.6A current limit, or a resistor can be added to program a lower limit. Do not exceed the absolute maximum input voltage of 60V. The micropower shutdown feature can be used to reduce quiescent current to near zero when the regulator is not needed.
Compliance Information
The standard LT1076CQ is not RoHS compliant. The LT1076CQ#PBF variant is lead-free and RoHS compliant. AEC-Q100 qualification is not applicable for this non-automotive part.
