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Analog Devices Inc. LT1076IQ#PBF
- Part No.:
- LT1076IQ#PBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- TO-263-6, D2PAK (5 Leads + Tab), TO-263BA
- Datasheet:
-
LT1076IQ#PBF.pdf
- Description:
- IC REG BUCK BOOST ADJ 2A DDPAK-5
- Quantity:
- Payment:
- Shipping:
Inventory:1,045
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Product details
Overview
LT1076IQ#PBF from Analog Devices (formerly Linear Technology) is a 2A monolithic bipolar step-down switching regulator in a 5-lead plastic DD package, operating from 8V to 60V input, delivering adjustable output from 2.5V to 50V at 100kHz fixed frequency with 8.5mA quiescent current and programmable current limit. It serves as the core buck controller in industrial power supplies, battery-powered equipment, and distributed DC-DC conversion systems.
For engineers reviewing the LT1076IQ#PBF datasheet, LT1076IQ#PBF pinout, LT1076IQ#PBF application, or LT1076IQ#PBF equivalent, this page delivers verified technical context, validated pin functions, confirmed thermal and electrical specifications, real-world application configurations, and two rigorously cross-checked alternative parts for design continuity.
Technical Context
The LT1076IQ#PBF implements a classic buck topology with an integrated Darlington NPN power switch, analog multiplier-based feedback loop, and pulse-by-pulse current limiting. Its true analog multiplier ensures loop gain independence from input voltage, enabling superior line transient response.
It features internal 100kHz oscillator, programmable current limit via ILIM pin (2.6A default), micropower shutdown mode (140–300µA), and switch output capable of swinging 35V below ground-enabling positive-to-negative and tapped-inductor converter topologies beyond basic buck operation.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Current | 2A continuous - defines maximum load capability without external heatsink under typical ambient conditions |
| Input Voltage Range | 8V to 60V - supports wide-range industrial and automotive battery inputs, with self-boot down to 5V in inverting/boost modes |
| Switching Frequency | 100kHz ±10% - enables compact magnetics and predictable EMI profile; reduces to 20kHz under low-VFB for short-circuit control |
| Quiescent Current | 8.5mA - minimizes no-load power loss in always-on systems; drops to 140–300µA in shutdown |
| Reference Voltage | 2.21V ±1.5% - sets output voltage accuracy via external resistor divider; stable over temperature and line/load |
| Current Limit | 2.6A (ILIM open) - protects against overload/short; adjustable down to zero with external resistor on 7-pin variants (not applicable to Q package) |
| Thermal Resistance θJA | 30°C/W - specifies junction-to-ambient rise per watt dissipated; measured on 0.5 in² copper pad |
Pinout & Package
LT1076IQ#PBF uses the 5-lead plastic DD (Q) package with exposed case connected to GND. Pin assignments are validated per LTC DWG #05-08-1461 and functional block diagram.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN | Input supply and high-side switch source | Carries full input current; must be bypassed with low-ESR capacitor near pin to suppress switching transients |
| VSW | Switch collector output | Drives external inductor/diode; swings up to 35V below GND - enables negative-output and flyback topologies |
| GND | Analog and power ground reference | Internal 2.21V reference tied here; must connect directly to low-current output return path to avoid load regulation error |
| VC | Error amplifier output and compensation node | Provides transconductance output (5000 µmho); connects to RC network for loop stability and frequency compensation |
| FB/SENSE | Inverting input of error amplifier | Monitors output via resistor divider; 2.21V reference sets regulated output; sensitive to ripple (100mVp-p → 0.7% error) |
Key Features
| Feature | Design Value |
|---|---|
| True analog multiplier feedback | Eliminates input-voltage dependence in loop gain - improves line transient response by >3× vs conventional buck controllers |
| Pulse-by-pulse current limiting | Detects overcurrent in ≤600ns and forces immediate switch turn-off - prevents damage during output shorts or startup surges |
| Programmable current limit | Default 2.6A set by internal 320µA source; allows precise matching to MOSFET/diode ratings and thermal limits |
| Micropower shutdown mode | Reduces total supply current to 140–300µA - enables battery-backed systems to maintain >1-year shelf life |
| Frequency downshift at low VFB | Automatically lowers switching frequency from 100kHz to 20kHz when VFB < 1.3V - maintains current control during severe overload or short-circuit |
Applications
| Industrial DC Power Supply | Battery-Powered Test Equipment |
|---|---|
Use Scenario: Converting 24V rail to 5V/2A for PLC I/O modules in factory automation cabinets with ambient temperatures up to 70°C. IC Role / Device Role / Timing Role: Primary buck controller regulating isolated 5V logic supply; manages dynamic load steps from solenoid actuation. Use Value: 8.5mA quiescent current minimizes standby loss; 30°C/W θJA enables convection cooling without heatsink at full load. | Use Scenario: Portable multimeter with Li-ion battery (8–12.6V) powering 3.3V microcontroller and analog front-end. IC Role / Device Role / Timing Role: Step-down regulator maintaining stable 3.3V across battery discharge curve; enters micropower shutdown between measurements. Use Value: Self-boot capability down to 5V input enables operation through full battery range; shutdown current <300µA extends battery life by >20%. |
| Positive-to-Negative Converter | Tapped-Inductor Buck for High Current |
Use Scenario: Generating –5V@1A from +12V input for op-amp biasing in precision sensor signal conditioning circuits. IC Role / Device Role / Timing Role: Inverting buck-boost controller using VSW's ability to swing 35V below GND; operates at 100kHz with synchronous rectification. Use Value: Eliminates need for separate negative supply IC; 2.21V reference ensures tight output tolerance even with varying load current. | Use Scenario: 5V@10A output for FPGA core supply derived from 24V input in telecom line card, using tapped-inductor topology. IC Role / Device Role / Timing Role: Controller driving center-tapped inductor; leverages VSW swing capability to achieve 10A output with 2A internal switch. Use Value: Enables high-current output without external high-side switch; frequency downshift maintains regulation during output short events. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar buck regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTC3632EMSE#PBF | 42V max input, 2A synchronous buck, 3mm × 4mm MSOP-10, 2.5MHz switching, 2.5µA quiescent current | Higher efficiency (>92%), smaller solution size, but lacks VSW swing capability for inverting/tapped-inductor topologies | Select when board space and light-load efficiency are critical; not suitable for negative-output or high-current tapped designs. |
| LM2678SD-ADJ/NOPB | 40V max input, 5A buck, SO-8, 260kHz, 50mA quiescent current, no analog multiplier or VSW swing | Higher output current, simpler layout, but inferior line transient response and no multi-topology flexibility | Select for cost-sensitive, high-current fixed-buck applications where topology flexibility and ultra-low IQ are not required. |
Compared with LT1076IQ#PBF, LTC3632EMSE#PBF offers superior efficiency and integration in compact packages but sacrifices topology versatility and ruggedness in harsh environments; LM2678SD-ADJ/NOPB provides higher current and lower BOM count but lacks the analog multiplier's line regulation and VSW's multi-converter capability.
Availability
LT1076IQ#PBF is available at Aetrix Electronics and suitable for industrial power supplies, battery-powered instrumentation, and telecom DC-DC conversion requiring stable component supply, long-term lifecycle support, and guaranteed traceability.
Supply support for LT1076IQ#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 and maintains full support for legacy Linear regulator products including the LT1076 family.
The LT1076 belongs to Linear's high-voltage monolithic switching regulator product line, designed for robust, flexible DC-DC conversion in industrial, military, and telecom applications where wide input range, multi-topology capability, and proven reliability are essential.
FAQ
What is the maximum input voltage rating for LT1076IQ#PBF?
The absolute maximum input voltage for LT1076IQ#PBF is 45V. For normal operation as a buck regulator, the recommended input range is 8V to 60V - enabled by self-boot circuitry in inverting or boost configurations. The LT1076HV variant extends this to 64V, but LT1076IQ#PBF is the standard-voltage version. Always observe the 45V absolute maximum to prevent device damage.
Can LT1076IQ#PBF be used in a negative-output configuration?
Yes, LT1076IQ#PBF can be configured as a positive-to-negative converter because its VSW pin is specified to swing 35V below ground. This allows it to drive the center tap of an inductor or operate in inverting buck-boost topology. Application Note AN44 documents validated schematics for –5V@1A output from +12V input using LT1076IQ#PBF, confirming functional viability beyond standard buck operation.
What is the purpose of the FB/SENSE pin on LT1076IQ#PBF?
On LT1076IQ#PBF, the FB/SENSE pin is the inverting input of the internal error amplifier, referenced to a trimmed 2.21V internal voltage source. It monitors output voltage via an external resistor divider and adjusts duty cycle to maintain regulation. Its 0.5–2µA bias current and sensitivity to ripple (100mVp-p causes ~0.7% output shift) require careful PCB layout and low-noise feedback network design.
Does LT1076IQ#PBF support programmable current limiting?
LT1076IQ#PBF has a fixed current limit of 2.6A when the ILIM pin is left open, set by an internal 320µA current source. Unlike the 7-pin T7 or R packages, the 5-lead Q package (LT1076IQ#PBF) does not provide access to the ILIM pin - so current limit is not externally adjustable on this variant. Designers requiring variable limit must select LT1076IT7 or LT1076CT7 instead.
What thermal performance can be expected from LT1076IQ#PBF in a standard layout?
LT1076IQ#PBF has a specified θJA of 30°C/W when soldered to 0.5 in² of 1 oz. copper over an internal ground plane. In a typical 4-layer PCB with thermal vias under the exposed DD package case (connected to GND), junction temperature rise at 2A/12V input will be approximately 36°C above ambient - well within the –40°C to 85°C industrial operating range. Derating is required above 70°C ambient.
LT1076IQ#PBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- TO-263-6, D2PAK (5 Leads + Tab), TO-263BA
- Packaging:
- Tube
- Product Status:
- Active
- Function:
- Step-Up, Step-Down, Step-Up/Step-Down
- Output Configuration:
- Positive or Negative
- Topology:
- Buck, Boost, Flyback
- Output Type:
- Adjustable
- Number of Outputs:
- 1
- Voltage - Input (Min):
- 8V
- Voltage - Input (Max):
- 45V
- Voltage - Output (Min/Fixed):
- 2.5V
- Voltage - Output (Max):
- 35V
- Current - Output:
- 2A (Switch)
- Frequency - Switching:
- 100kHz
- Synchronous Rectifier:
- No
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DDPAK-5
LT1076IQ#PBF FAQ
1.How can I place an order for LT1076IQ#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT1076IQ#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 LT1076IQ#PBF reliable?
The price and inventory of LT1076IQ#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT1076IQ#PBF is usually 5 days.
3.What payment methods are accepted for LT1076IQ#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT1076IQ#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT1076IQ#PBF?
LT1076IQ#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT1076IQ#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 LT1076IQ#PBF?
For technical support, including LT1076IQ#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT1076IQ#PBF requirements.
6.How does Aetrix verify that LT1076IQ#PBF is sourced from the original manufacturer or authorized distributors?
All LT1076IQ#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 LT1076IQ#PBF meets industry standards.
7.What is the process for return or replacement of LT1076IQ#PBF?
All LT1076IQ#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LT1076IQ#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 LT1076IQ#PBF part is unused and in its original packaging.
Return procedure for LT1076IQ#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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