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Analog Devices Inc. LT1176CN8#PBF
- Part No.:
- LT1176CN8#PBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 8-DIP (0.300", 7.62mm)
- Datasheet:
-
LT1176CN8#PBF.pdf
- Description:
- IC REG BCK FLYBCK ADJ 1.2A 8PDIP
- Quantity:
- Payment:
- Shipping:
Inventory:2,312
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Product details
Overview
LT1176CN8#PBF from Analog Devices (formerly Linear Technology) is a 1A monolithic bipolar step-down switching regulator in an 8-lead PDIP package, preset to 5V output with 100kHz switching frequency, 8V–35V input range, and 8mA quiescent current. It serves as an onboard 5V power supply for industrial control modules requiring stable, low-noise DC/DC conversion.
For engineers reviewing the LT1176CN8#PBF datasheet, LT1176CN8#PBF pinout, LT1176CN8#PBF application, or LT1176CN8#PBF equivalent, key selection factors include its fixed 5V output, micropower shutdown mode (300µA), true analog multiplier feedback for fast line transient response, and validated operation down to 5V input in inverting configurations.
Technical Context
The LT1176CN8#PBF implements a classic positive buck topology enhanced with a true analog multiplier in the feedback loop, enabling near-instantaneous response to input voltage fluctuations and input-independent loop gain. Its switch output is rated to swing below ground, supporting positive-to-negative and negative-boost converter topologies.
On-chip pulse-by-pulse current limiting provides robust short-circuit protection, while internal frequency presetting (100kHz) and fixed 5V sense threshold (5.0V ±0.5%) eliminate external resistor dividers. The device operates across 0°C to 125°C junction temperature with thermal resistance θJA = 90°C/W in the N8 package.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 5.0V ±0.5% over full load, line, and temperature - eliminates need for external feedback resistors. |
| Switching Frequency | 100kHz typical - enables compact magnetics and predictable EMI filtering without external timing components. |
| Input Voltage Range | 8V to 35V for buck mode; self-boot allows ≥5V in inverting/boost modes - supports wide industrial input rails. |
| Quiescent Current | 7.5mA typical in active mode; 300µA in micropower shutdown - extends battery life in standby applications. |
| Switch Current Limit | 1.7A typical (ILIM open) - provides margin above 1A continuous rating for surge handling. |
| Duty Cycle Range | 0% to 85% max - ensures stable regulation at high VIN/VOUT ratios (e.g., 35V→5V). |
| Thermal Resistance | θJA = 90°C/W (N8 package) - limits continuous power dissipation to ~0.5W at 70°C ambient without heatsink. |
Pinout & Package
LT1176CN8#PBF uses an 8-lead plastic DIP (N8) package, 0.300-inch width, with standard through-hole mounting and θJA = 90°C/W. Pin 1 is VIN; pin 4 is FB/SENSE (internally tied to 5V reference); pin 5 is VSW (switch output); pin 8 is SHUTDOWN.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN (Pin 1) | Main input supply connection | Accepts 8–35V DC; powers internal bias circuitry and switch driver. |
| ILIM (Pin 2) | Current limit programming | Open-circuit configures 1.7A switch limit; optional resistor sets lower thresholds. |
| GND (Pin 3) | Power and signal reference | Common return for input capacitor, inductor, and feedback network. |
| FB/SENSE (Pin 4) | Output voltage sensing | Internally referenced to 5.0V; no external divider needed for fixed-output version. |
| VSW (Pin 5) | Switch node output | Drives external inductor; swings below ground in inverting configurations. |
| VC (Pin 6) | Control voltage output | Provides error amplifier output; used for loop compensation and external synchronization. |
| STATUS (Pin 7) | Regulation monitor | Open-collector output asserting high when output is within ±5% of 5V. |
| SHUTDOWN (Pin 8) | Enable/disable control | Logic-high (>2.45V) disables switching and reduces supply current to 300µA. |
Key Features
| Feature | Design Value |
|---|---|
| True analog multiplier feedback | Eliminates input-voltage-dependent loop gain variation, enabling consistent dynamic response across 8–35V input range. |
| Pulse-by-pulse current limiting | Prevents switch destruction during output shorts or overloads without external sensing components. |
| Micropower shutdown mode | Reduces total supply current to 300µA, enabling use in battery-backed systems with long idle periods. |
| Ground-swinging switch output | Supports non-isolated inverting (positive-to-negative) and negative-boost topologies without level-shifting circuitry. |
| Self-boot capability | Enables operation from as low as 5V input in inverting/boost modes, extending usable input range beyond buck-only limits. |
Applications
| Industrial PLC I/O Module Power | Automotive Body Control Unit Supply |
|---|---|
Use Scenario: Providing isolated 5V rail for digital I/O drivers and ADC references in DIN-rail mounted programmable logic controllers. IC Role / Device Role / Timing Role: Primary buck regulator delivering regulated 5V/0.8A from 24V field bus, with STATUS pin monitoring output health for diagnostics. Use Value: Fixed 5V output and 100kHz switching enable compact LC filter design; micropower shutdown supports firmware-controlled sleep modes. | Use Scenario: Generating 5V for microcontroller and CAN transceiver in vehicle door modules powered from 12V battery with cold-crank tolerance. IC Role / Device Role / Timing Role: Input-robust buck converter operating down to 5V during cranking, using SHUTDOWN pin for ignition-synchronized power gating. Use Value: 35V absolute max input and 85% duty cycle ensure regulation during 16V load-dump transients; STATUS flag alerts MCU to undervoltage events. |
| Medical Point-of-Care Instrumentation | Test & Measurement Equipment Bias Supply |
Use Scenario: Powering precision analog front-ends and low-noise op-amps in portable diagnostic devices with Li-ion battery input (3.0–4.2V) and boost-buck capability. IC Role / Device Role / Timing Role: Configured as negative-boost converter to generate –5V from 3.7V battery, leveraging VSW's sub-ground swing and self-boot feature. Use Value: Eliminates need for external charge pump or transformer; analog multiplier ensures stable regulation despite battery voltage sag. | Use Scenario: Supplying clean 5V for high-speed ADC clock buffers and FPGA configuration memory in benchtop oscilloscopes. IC Role / Device Role / Timing Role: Low-noise buck regulator with VC pin accessible for external loop compensation and EMI reduction via spread-spectrum sync. Use Value: 8mA quiescent current minimizes standby power; 100kHz fundamental frequency simplifies EMI filter design for sensitive measurement circuits. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar buck regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTC3605EDE#TRPBF | 36V input, 1.2A synchronous buck, 3mm × 4mm DFN, 2.2MHz switching, 28µA IQ | Higher efficiency, smaller footprint, but requires external compensation and lacks VSW sub-ground capability | Preferred for space-constrained, high-efficiency designs where inverting topology is not required |
| LM2576T-5.0 | 40V input, 3A buck, TO-220 package, 52kHz switching, 50mA IQ, no STATUS or SHUTDOWN pins | Higher current, lower cost, but larger size, higher quiescent current, and no monitoring/control features | Suitable for cost-sensitive, high-current applications without need for diagnostics or ultra-low standby power |
Compared with LTC3605EDE#TRPBF and LM2576T-5.0, the LT1176CN8#PBF uniquely combines fixed 5V output, micropower shutdown, STATUS monitoring, and sub-ground switch capability in a through-hole DIP package-making it optimal for legacy industrial designs requiring diagnostic visibility and multi-topology flexibility without redesigning PCB layout.
Availability
LT1176CN8#PBF is available at Aetrix Electronics and suitable for industrial PLCs, automotive body control units, medical instrumentation, test equipment, and embedded systems requiring stable component supply with long lifecycle support and lead-free compliance.
Supply support for LT1176CN8#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 its high-performance analog IC portfolio, emphasizing precision power management, signal conditioning, and robust industrial-grade components.
The LT1176CN8#PBF belongs to Linear's legacy monolithic switching regulator family, designed specifically for reliable, low-component-count DC/DC conversion in harsh environments where thermal stability, fault tolerance, and topology flexibility are critical.
FAQ
What is the maximum input voltage rating for the LT1176CN8#PBF?
The LT1176CN8#PBF has an absolute maximum input voltage rating of 38V, with recommended continuous operation up to 35V in buck configuration. Exceeding 35V may trigger internal protection or reduce reliability. The LT1176CN8#PBF datasheet specifies 8V–35V as the normal operating input range for stable 5V regulation, and its self-boot feature enables operation from as low as 5V in inverting topologies.
Does the LT1176CN8#PBF require external feedback resistors to set the output voltage?
No, the LT1176CN8#PBF does not require external feedback resistors because it is the fixed 5V version (LT1176-5). Pin 4 (FB/SENSE) is internally connected to a precision 5.0V reference with ±0.5% tolerance across temperature and load. This eliminates resistor matching errors and saves board space-unlike the adjustable LT1176CN8 variant, which requires external resistive division.
How does the STATUS pin on the LT1176CN8#PBF function in system monitoring?
The STATUS pin on the LT1176CN8#PBF is an open-collector output that pulls low when the regulated 5V output deviates by more than ±5% from nominal. It sources up to 10µA when high (indicating good regulation) and sinks up to 1.6mA when low (indicating fault). This enables direct interface with microcontroller GPIOs or optocouplers for real-time power health monitoring without additional circuitry.
Can the LT1176CN8#PBF be used in a positive-to-negative converter configuration?
Yes, the LT1176CN8#PBF can be configured as a positive-to-negative converter because its VSW pin is specified to swing below ground-enabling inverting buck-boost topologies. The LT1176CN8#PBF's internal architecture supports this without external level shifters, and its self-boot feature allows startup from inputs as low as 5V in such configurations, as confirmed in the official application schematics and block diagram.
What thermal considerations apply to the LT1176CN8#PBF in continuous operation?
The LT1176CN8#PBF in the N8 DIP package has θJA = 90°C/W under typical mounting conditions. At 0.5W dissipation (e.g., 12V→5V/0.5A), junction temperature rise is ~45°C above ambient-well within the 125°C max rating. To sustain 1A loads continuously, minimize copper thermal resistance, avoid enclosing the device, and verify peak switch current (≤1.2A) and duty cycle (<85%) per the application hints in the LT1176CN8#PBF datasheet.
LT1176CN8#PBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 8-DIP (0.300", 7.62mm)
- Packaging:
- Tube
- Product Status:
- Active
- Function:
- Step-Up, Step-Down, Step-Up/Step-Down
- Output Configuration:
- Positive or Negative
- Topology:
- Buck, Flyback
- Output Type:
- Adjustable
- Number of Outputs:
- 1
- Voltage - Input (Min):
- 8V
- Voltage - Input (Max):
- 35V
- Voltage - Output (Min/Fixed):
- 2.21V
- Voltage - Output (Max):
- 31.5V
- Current - Output:
- 1.2A (Switch)
- Frequency - Switching:
- 100kHz
- Synchronous Rectifier:
- No
- Operating Temperature:
- 0°C ~ 70°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- 8-PDIP
LT1176CN8#PBF FAQ
1.How can I place an order for LT1176CN8#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT1176CN8#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 LT1176CN8#PBF reliable?
The price and inventory of LT1176CN8#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT1176CN8#PBF is usually 5 days.
3.What payment methods are accepted for LT1176CN8#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT1176CN8#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT1176CN8#PBF?
LT1176CN8#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT1176CN8#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 LT1176CN8#PBF?
For technical support, including LT1176CN8#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT1176CN8#PBF requirements.
6.How does Aetrix verify that LT1176CN8#PBF is sourced from the original manufacturer or authorized distributors?
All LT1176CN8#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 LT1176CN8#PBF meets industry standards.
7.What is the process for return or replacement of LT1176CN8#PBF?
All LT1176CN8#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LT1176CN8#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 LT1176CN8#PBF part is unused and in its original packaging.
Return procedure for LT1176CN8#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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