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Analog Devices Inc. LT1176CSW#PBF
- Part No.:
- LT1176CSW#PBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 20-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
LT1176CSW#PBF.pdf
- Description:
- IC REG BCK FLYBACK ADJ 1.2A 20SO
- Quantity:
- Payment:
- Shipping:
Inventory:4,285
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Product details
Overview
LT1176CSW#PBF from Analog Devices (formerly Linear Technology) is a 1A monolithic bipolar step-down switching regulator in a 20-lead plastic SO package, featuring 100kHz fixed switching frequency, 5V preset output, 8mA quiescent current, and operation up to 35V input-designed for compact onboard DC/DC conversion in industrial power supplies.
For engineers reviewing the LT1176CSW#PBF datasheet, LT1176CSW#PBF pinout, LT1176CSW#PBF application, or LT1176CSW#PBF equivalent, key selection criteria include its true analog multiplier feedback loop, micropower shutdown mode, ±4% status window accuracy, and compatibility with low-loss powdered iron or Kool Mµ inductors in buck topologies.
Technical Context
The LT1176CSW#PBF implements a classic positive buck topology enhanced with an on-chip analog multiplier in the feedback path, enabling near-instantaneous response to input voltage transients and input-voltage-independent loop gain. Its switch output is rated to swing below ground, supporting inverting and negative-boost configurations.
It integrates pulse-by-pulse current limiting (1.7A typical), internal 6V bias regulator, and a dedicated STATUS pin with ±4% output voltage monitoring window. The device operates across 0°C to 125°C junction temperature with θJA = 50°C/W in the SW package, requiring no external compensation in standard buck designs.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Preset 5V ±0.5% over full load/temperature range-enables direct replacement of linear regulators without external resistor divider. |
| Switching Frequency | 100kHz fixed (TYP)-allows use of cost-effective, low-profile 100µH inductors and reduces EMI filtering complexity. |
| Input Voltage Range | 8V to 35V (buck mode); down to 5V with self-boot in inverting/boost-supports wide-input industrial rails including 12V, 24V, and 32V systems. |
| Quiescent Current | 7.5mA typical-minimizes no-load power loss in battery-backed or always-on subsystems. |
| Current Limit | 1.7A typical (ILIM open)-provides robust short-circuit protection without external sensing resistors. |
| Status Accuracy | ±4% of output voltage-enables reliable power-good signaling for microcontroller reset sequencing. |
| Thermal Resistance | θJA = 50°C/W-permits 0.8A continuous output at +70°C ambient with minimal copper area, unlike the 90°C/W DIP variant. |
Pinout & Package
LT1176CSW#PBF is housed in a 20-lead plastic small-outline (SO) package (SW), 0.300" wide, with exposed thermal pad-compatible footprint per LTC DWG #05-08-1620. Pin 1 identified by notch; recommended solder pad layout provided in datasheet.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN | Input supply connection | Accepts 8–35V DC; must be decoupled with ≥470µF low-ESR capacitor to sustain peak switch current. |
| ILIM | Current limit programming | Open-circuit configures 1.7A limit; optional resistor sets lower threshold per ILIM = (RLIM – 1k)/7.65k formula. |
| GND | Power and signal ground | Four dedicated GND pins (pins 4,5,6,7) reduce ground impedance and improve noise immunity in high-current paths. |
| FB/SENSE | Feedback input (5V version) | Internally biased to 5V reference; no external divider required-simplifies layout and improves regulation stability. |
| VSW | Switch node output | Drives external inductor; rated to swing 20V below GND-enables negative-output converter topologies. |
| VC | Control voltage output | Provides error amplifier output; used for external loop compensation or synchronization in multi-regulator systems. |
| STATUS | Power-good indicator | Sinks 1.6mA when output deviates >±4%; drives LED or microcontroller interrupt directly. |
| SHUTDOWN | Enable/disable control | Logic-low (<0.3V) disables regulator and reduces supply current to 140µA-ideal for system-level power sequencing. |
Key Features
| Feature | Design Value |
|---|---|
| True analog multiplier feedback | Eliminates input-voltage-dependent loop gain variation, ensuring consistent transient response across 8–35V input range. |
| On-chip pulse-by-pulse current limiting | Prevents destructive overcurrent during output shorts without external sense resistor or delay, enhancing reliability. |
| Micropower shutdown mode | Reduces total supply current to 140µA-critical for standby power budgets in energy-conscious industrial gateways. |
| Ground-referenced STATUS pin | Provides rail-to-rail compatible power-good signal without level-shifting circuitry, simplifying interface to 3.3V/5V logic. |
| Self-boot capability in non-buck modes | Enables operation from as low as 5V input in inverting or boost configurations-expands usable input range beyond buck limits. |
Applications
| Industrial PLC Power Rails | Embedded Controller Core Supply |
|---|---|
Use Scenario: Providing regulated 5V power to programmable logic controller I/O modules operating from unregulated 24V DC field bus. IC Role / Device Role / Timing Role: Primary buck regulator converting 24V to 5V at up to 0.8A, with STATUS pin feeding watchdog timer reset input. Use Value: 100kHz switching allows compact 100µH inductor; 8mA quiescent current minimizes heat buildup in sealed enclosures. | Use Scenario: Generating stable 5V core supply for ARM Cortex-M7 microcontrollers in edge AI sensor nodes. IC Role / Device Role / Timing Role: Onboard switching regulator delivering 5V/0.8A with micropower shutdown synchronized to MCU sleep states. Use Value: 140µA shutdown current extends battery life; ±4% STATUS accuracy ensures deterministic brown-out recovery. |
| Test Equipment Auxiliary Supply | Ruggedized HMI Display Backlight Driver |
Use Scenario: Powering analog front-end circuitry in portable multimeters requiring low-noise, stable 5V from 9V alkaline batteries. IC Role / Device Role / Timing Role: Step-down regulator with self-boot support enabling operation down to 5V input during battery discharge. Use Value: True analog multiplier maintains regulation accuracy despite rapidly falling battery voltage-no output droop under load. | Use Scenario: Driving CCFL or LED backlight in factory-floor HMIs exposed to 12V vehicle or machinery power buses. IC Role / Device Role / Timing Role: Buck converter supplying 5V to backlight driver IC, with STATUS pin validating power integrity before display initialization. Use Value: 35V max input withstands load-dump transients; four GND pins suppress EMI coupling into sensitive video signals. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar switching regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTC3605EDE#PBF | 36V input, 1.2A synchronous buck; requires external MOSFET drivers; 3mm × 4mm DFN package. | Higher efficiency (>92%), smaller footprint, but lacks ground-swinging VSW and analog multiplier architecture. | Choose LTC3605EDE#PBF for space-constrained, high-efficiency designs where synchronous rectification is preferred over bipolar switch simplicity. |
| LM2678SX-5.0/NOPB | 40V input, 5A adjustable-output buck; 200kHz fixed frequency; no STATUS pin; higher quiescent current (50mA). | Higher current capacity and wider input range, but lacks micropower shutdown and precise ±4% power-good monitoring. | Choose LM2678SX-5.0/NOPB when output current exceeds 1A or when board-level thermal management supports higher dissipation. |
Compared with LTC3605EDE#PBF and LM2678SX-5.0/NOPB, the LT1176CSW#PBF uniquely combines bipolar switch ruggedness, analog multiplier-based transient immunity, and integrated STATUS functionality in a thermally optimized SO package-making it optimal for industrial applications demanding reliability over raw efficiency.
Availability
LT1176CSW#PBF is available at Aetrix Electronics and suitable for industrial PLC power rails, embedded controller core supplies, and test equipment auxiliary supplies requiring stable component supply, long-term lifecycle support, and traceable sourcing.
Supply support for LT1176CSW#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 product support, datasheet archives, and application engineering for legacy Linear parts including the LT1176 family.
The LT1176 series was designed as a robust, easy-to-use monolithic buck regulator targeting industrial, instrumentation, and embedded systems where reliability, wide input range, and minimal external components are critical.
FAQ
What is the maximum continuous output current supported by the LT1176CSW#PBF in a standard buck configuration?
The LT1176CSW#PBF supports up to 0.8A continuous output current in a standard buck configuration when mounted on a PCB with typical copper area and ambient temperature ≤70°C. This limit arises from thermal constraints (θJA = 50°C/W) and the 1.7A current limit setting-exceeding 0.8A risks junction temperature exceeding 125°C under sustained load. Derating is required above 70°C ambient.
Does the LT1176CSW#PBF require an external feedback resistor divider for 5V output?
No, the LT1176CSW#PBF does not require an external feedback resistor divider for 5V output. It is the -5 variant with an internal 5V reference connected to the FB/SENSE pin, eliminating external components. This differs from the adjustable LT1176CSW, which uses the same pin as a sense input requiring external resistors.
Can the LT1176CSW#PBF be used in a negative-output (inverting) configuration?
Yes, the LT1176CSW#PBF can be used in a negative-output configuration because its VSW pin is specified to swing up to 20V below ground. When configured as a positive-to-negative converter, it accepts inputs as low as 5V due to self-boot operation-enabling generation of regulated –5V from a 5V–12V source without additional charge pumps.
What is the purpose of the four GND pins on the LT1176CSW#PBF SW package?
The four GND pins (pins 4, 5, 6, and 7) on the LT1176CSW#PBF reduce ground path impedance for high-frequency switch currents, minimize voltage spikes during switching transitions, and improve thermal conduction from the die to the PCB. This layout lowers EMI emissions and enhances regulation stability-especially critical in noisy industrial environments where the LT1176CSW#PBF is commonly deployed.
How does the analog multiplier in the LT1176CSW#PBF feedback loop improve performance compared to conventional error amplifiers?
The analog multiplier in the LT1176CSW#PBF feedback loop makes loop gain independent of input voltage, enabling consistent dynamic response across the full 8–35V input range. Unlike conventional regulators whose bandwidth and phase margin degrade with input variation, the LT1176CSW#PBF maintains fast, overdamped transient recovery-critical for powering microcontrollers or ADCs subject to line fluctuations.
LT1176CSW#PBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 20-SOIC (0.295", 7.50mm Width)
- 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:
- Surface Mount
- Supplier Device Package:
- 20-SO
LT1176CSW#PBF FAQ
1.How can I place an order for LT1176CSW#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT1176CSW#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 LT1176CSW#PBF reliable?
The price and inventory of LT1176CSW#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT1176CSW#PBF is usually 5 days.
3.What payment methods are accepted for LT1176CSW#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT1176CSW#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT1176CSW#PBF?
LT1176CSW#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT1176CSW#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 LT1176CSW#PBF?
For technical support, including LT1176CSW#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT1176CSW#PBF requirements.
6.How does Aetrix verify that LT1176CSW#PBF is sourced from the original manufacturer or authorized distributors?
All LT1176CSW#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 LT1176CSW#PBF meets industry standards.
7.What is the process for return or replacement of LT1176CSW#PBF?
All LT1176CSW#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LT1176CSW#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 LT1176CSW#PBF part is unused and in its original packaging.
Return procedure for LT1176CSW#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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