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Analog Devices Inc. LT1176CSW#TRPBF
- Part No.:
- LT1176CSW#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 20-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
LT1176CSW#TRPBF.pdf
- Description:
- IC REG BCK FLYBACK ADJ 1.2A 20SO
- Quantity:
- Payment:
- Shipping:
Inventory:4,815
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Product details
Overview
LT1176CSW#TRPBF 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. It serves as an onboard DC/DC power converter for industrial control modules requiring stable 5V rail generation from wide-input unregulated supplies.
For engineers reviewing the LT1176CSW#TRPBF datasheet, LT1176CSW#TRPBF pinout, LT1176CSW#TRPBF application, or LT1176CSW#TRPBF equivalent, key selection criteria include its 5V fixed output configuration, 20-pin SO thermal performance (θJA = 50°C/W), micropower shutdown mode (300µA), and compatibility with standard buck, positive-to-negative, and negative-boost topologies.
Technical Context
The LT1176CSW#TRPBF implements a classic positive buck topology enhanced with a true analog multiplier in the feedback loop, 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 boost configurations without external level-shifting.
On-chip pulse-by-pulse current limiting provides robust short-circuit protection, while a self-boot feature enables operation down to 5V input in inverting/boost modes. The device integrates the power switch, oscillator, error amplifier, current limit circuitry, and status monitoring-requiring only external inductor, diode, and capacitors for basic 5V buck operation.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 5V ±0.5% over full temperature/load/input range - ensures stable logic supply without external resistor divider. |
| Switching Frequency | 100kHz typical - balances EMI control, inductor size, and efficiency for mid-power industrial converters. |
| Input Voltage Range | 8V to 35V for buck mode; down to 5V in inverting/boost via self-boot - supports wide-range industrial DC inputs. |
| Quiescent Current | 8mA typical in normal operation; 300µA in micropower shutdown - extends standby time in battery-backed systems. |
| Switch Current Limit | 1.7A typical (ILIM open) - defines maximum peak inductor current and short-circuit energy handling capability. |
| Thermal Resistance | θJA = 50°C/W (20-pin SO) - enables ~1W continuous dissipation with standard PCB copper, critical for compact designs. |
| Status Output | Open-collector window comparator ±4% of VOUT - provides reliable power-good signaling for system sequencing and fault detection. |
Pinout & Package
LT1176CSW#TRPBF is housed in a 20-lead plastic small-outline (SO) package (SW), 0.300-inch wide body, with exposed thermal pad not electrically connected. Pin 1 is marked by notch or cavity; leads are gull-wing, RoHS-compliant, and rated for 260°C reflow.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN | Input supply connection | Accepts 8–35V unregulated DC; powers internal bias and switch driver circuits. |
| ILIM | Current limit programming | Open connection sets 1.7A limit; resistor to GND adjusts threshold per ILIM = (RLIM – 1k)/7.65k formula. |
| GND | Power and signal reference | Four dedicated pins (pins 4, 5, 6, 7) minimize ground impedance and improve noise immunity. |
| FB/SENSE | Feedback input | Internally tied to 5V reference; no external divider needed for LT1176CSW-5 variant. |
| VSW | Switch node output | Drives external inductor/diode; swings below ground to enable inverting topologies. |
| VC | Control voltage output | Provides error amplifier output; used for loop compensation and external synchronization. |
| STATUS | Power-good indicator | Open-collector output active low when VOUT is within ±4% window - drives LED or microcontroller interrupt. |
| SHUTDOWN | Enable/disable control | Logic-high (>2.45V) disables regulator and reduces supply current to 300µA. |
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. |
| Pulse-by-pulse current limiting | Prevents thermal runaway during output shorts by limiting each switching cycle's peak current to 1.7A. |
| Self-boot capability | Enables operation from as low as 5V input in inverting/boost configurations without auxiliary winding or charge pump. |
| Integrated status monitor | Provides precise ±4% output voltage window detection with <9µs delay - suitable for real-time power sequencing. |
| Low thermal resistance package | 50°C/W θJA allows 1W continuous dissipation on standard FR4 with minimal copper area - reduces need for heatsinks. |
Applications
| Industrial PLC I/O Module | Medical Sensor Interface |
|---|---|
Use Scenario: Generating isolated 5V logic supply from 24V field bus in DIN-rail mounted programmable logic controller I/O modules. IC Role / Device Role / Timing Role: Primary buck regulator providing clean, regulated 5V for microcontroller, ADC, and digital isolators. Use Value: Micropower shutdown (300µA) enables low-power sleep states; 35V max input accommodates 24V bus transients per IEC 61000-4-5. | Use Scenario: Powering low-noise analog front-end and precision ADC in portable patient monitoring sensors. IC Role / Device Role / Timing Role: Fixed 5V supply with excellent line regulation (0.005%/V) minimizing supply-induced ADC offset drift. Use Value: Analog multiplier feedback ensures stable regulation despite battery voltage sag, extending usable runtime. |
| Test Equipment Power Supply | Automated Test Fixture |
Use Scenario: Onboard 5V rail generation in benchtop multimeters and signal analyzers powered from universal AC adapters. IC Role / Device Role / Timing Role: High-efficiency (≥85% at 0.8A) buck converter replacing linear regulators to reduce thermal load in sealed enclosures. Use Value: 100kHz switching enables compact 100µH inductors; 50°C/W θJA simplifies thermal design without forced air. | Use Scenario: Providing 5V power to FPGA configuration circuitry and interface buffers in automated board test handlers. IC Role / Device Role / Timing Role: Regulator with STATUS pin driving FPGA DONE signal to ensure configuration completes before system boot. Use Value: ±4% status window guarantees FPGA VCCIO remains within JEDEC spec before releasing reset. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar switching regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTC3605EDE#TRPBF | 36V input, 1.2A synchronous buck, 3mm × 4mm DFN, 2.25MHz switching | Higher frequency enables smaller magnetics; synchronous rectification improves light-load efficiency | Preferred for space-constrained designs needing >90% efficiency at 10mA–1A loads |
| LM2678SD-5.0/NOPB | 40V input, 5A buck, 8-pin SO, 260kHz, no STATUS pin, higher quiescent current (50mA) | Lacks power-good signaling and micropower shutdown; requires external feedback divider for 5V | Suitable for high-current, cost-sensitive applications where STATUS and ultra-low IQ are noncritical |
Compared with LTC3605EDE#TRPBF and LM2678SD-5.0/NOPB, the LT1176CSW#TRPBF offers superior transient response due to analog multiplier feedback, lower shutdown current (300µA vs. 100µA–1mA), and integrated 5V reference - making it optimal for precision industrial systems prioritizing stability and low standby power over footprint or peak efficiency.
Availability
LT1176CSW#TRPBF is available at Aetrix Electronics and suitable for industrial automation, medical instrumentation, and test equipment requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.
Supply support for LT1176CSW#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 legacy high-performance analog and power management product lines with full datasheet, simulation model, and application support.
The LT1176 series was designed as a robust, thermally efficient monolithic buck regulator for industrial and instrumentation applications demanding wide input range, fixed 5V output, and reliable short-circuit protection without external complexity.
FAQ
What is the maximum input voltage rating for LT1176CSW#TRPBF in buck configuration?
The LT1176CSW#TRPBF has an absolute maximum input voltage rating of 38V, but its specified operating range in buck configuration is 8V to 35V. Exceeding 35V may cause premature failure or violate safety margins defined in the Absolute Maximum Ratings table. For reliable long-term operation, design with ≤33V nominal input and account for transients per IEC 61000-4-5.
Does LT1176CSW#TRPBF require external components to set its 5V output?
No, the LT1176CSW#TRPBF is the fixed 5V version (denoted by "-5" suffix) and contains an internal 5V reference connected directly to the SENSE pin. Unlike the adjustable LT1176CSW, it requires no external resistor divider - only input/output capacitors, inductor, and catch diode for basic operation.
How does the STATUS pin on LT1176CSW#TRPBF function in a system power-up sequence?
The STATUS pin on LT1176CSW#TRPBF is an open-collector output that pulls low when the output voltage falls outside a ±4% window around 5V. During startup, it remains high-impedance until regulation is achieved, then goes low if VOUT deviates - enabling use as a power-good signal to gate microcontroller reset release or enable downstream LDOs.
Can LT1176CSW#TRPBF be used in a positive-to-negative converter topology?
Yes, the LT1176CSW#TRPBF supports positive-to-negative conversion because its VSW pin is specified to swing below ground. When configured as an inverting buck-boost, it generates a regulated negative output from a positive input - e.g., −5V from +12V - leveraging the self-boot feature to operate down to 5V input in this mode.
What thermal derating applies to LT1176CSW#TRPBF at 70°C ambient temperature?
With θJA = 50°C/W, the LT1176CSW#TRPBF junction temperature rises 50°C per watt of dissipation. At 70°C ambient, maximum allowable power dissipation before reaching TJMAX = 125°C is (125 − 70)/50 = 1.1W. Derate linearly above 70°C ambient; for continuous 1A output at 24V input, verify actual dissipation using the provided power formula and adjust copper area or airflow accordingly.
LT1176CSW#TRPBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 20-SOIC (0.295", 7.50mm Width)
- Packaging:
- Tape & Reel (TR)
- 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#TRPBF FAQ
1.How can I place an order for LT1176CSW#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT1176CSW#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 LT1176CSW#TRPBF reliable?
The price and inventory of LT1176CSW#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT1176CSW#TRPBF is usually 5 days.
3.What payment methods are accepted for LT1176CSW#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT1176CSW#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT1176CSW#TRPBF?
LT1176CSW#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT1176CSW#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 LT1176CSW#TRPBF?
For technical support, including LT1176CSW#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT1176CSW#TRPBF requirements.
6.How does Aetrix verify that LT1176CSW#TRPBF is sourced from the original manufacturer or authorized distributors?
All LT1176CSW#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 LT1176CSW#TRPBF meets industry standards.
7.What is the process for return or replacement of LT1176CSW#TRPBF?
All LT1176CSW#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LT1176CSW#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 LT1176CSW#TRPBF part is unused and in its original packaging.
Return procedure for LT1176CSW#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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