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Analog Devices Inc. LT1176CSW-5#TRPBF
- Part No.:
- LT1176CSW-5#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 20-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
LT1176CSW-5#TRPBF.pdf
- Description:
- IC REG BUCK FLYBACK 5V 1.2A 20SO
- Quantity:
- Payment:
- Shipping:
Inventory:4,236
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Product details
Overview
LT1176CSW-5#TRPBF from Analog Devices (formerly Linear Technology) is a 1A monolithic bipolar step-down switching regulator in 20-lead plastic SO package, preset to 5V output, operating from 8V–35V input, with 100kHz switching frequency and 8mA quiescent current. It serves as an onboard DC/DC buck converter for industrial power rails.
For engineers reviewing the LT1176CSW-5#TRPBF datasheet, LT1176CSW-5#TRPBF pinout, LT1176CSW-5#TRPBF application, or LT1176CSW-5#TRPBF equivalent, key selection factors include its fixed 5V output, internal current limit of 1.2A (peak), micropower shutdown mode (<300µA), and compatibility with low-loss powdered iron or Kool Mµ inductors in compact layouts.
Technical Context
The LT1176CSW-5#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 negative-boost configurations.
It integrates on-chip pulse-by-pulse current limiting (1.2A peak), self-boot capability enabling operation down to 5V input in inverting modes, and a dedicated STATUS pin with ±5% output voltage window monitoring. Thermal resistance is 50°C/W in the 20-lead SO package.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 5V ±0.5% over line, load, and temperature - enables direct replacement of linear regulators without external feedback resistors. |
| Input Voltage Range | 8V to 35V for buck operation; down to 5V in inverting/boost modes via self-boot - supports wide industrial input rails. |
| Switching Frequency | 100kHz typical - balances EMI control, inductor size, and efficiency for mid-power applications. |
| Peak Switch Current | 1.2A - defines maximum continuous output current capability before current-limit activation in standard buck configuration. |
| Quiescent Current | 7.5mA typical in normal mode; 140µA in micropower shutdown - extends battery life in standby-sensitive systems. |
| Thermal Resistance | θJA = 50°C/W - requires minimal PCB copper area for thermal management at ≤0.8A continuous load. |
| Status Accuracy | ±5% output voltage window - provides reliable power-good signaling for microcontroller reset sequencing. |
Pinout & Package
LT1176CSW-5#TRPBF is housed in a 20-lead plastic small-outline (SO) package, 0.300-inch wide body, with exposed thermal pad-compatible footprint per LTC DWG #05-08-1620. Pin 1 marked by notch or cavity; recommended solder pad layout includes 0.045" × 0.045" pads with 0.005" clearance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN | Input supply connection | Accepts 8V–35V unregulated DC; must be decoupled with ≥470µF low-ESR capacitor near pin. |
| ILIM | Current limit programming | Open-circuit configures 1.2A peak switch current; optional resistor sets higher limit (e.g., 7kΩ → 1.7A). |
| GND | Power and signal reference | Four dedicated GND pins (pins 4,5,6,7) reduce ground impedance and improve noise immunity. |
| FB/SENSE | Feedback input | Internally tied to 5V reference; no external divider required - simplifies layout and improves stability. |
| VSW | Switch node output | Drives external inductor; swings below ground in inverting topologies - requires Schottky catch diode (e.g., 1N5819). |
| VC | Control voltage output | Provides error amplifier output; used for loop compensation with external RC network (C2=0.01µF, R3=2.7kΩ typical). |
| STATUS | Power-good indicator | Open-collector output active high when VOUT is within ±5%; sinks up to 1.6mA - drives LED or MCU interrupt directly. |
| SHUTDOWN | Enable/disable control | Logic-high (>2.45V) disables regulator and reduces IQ to <300µA; threshold tolerance ±0.25V ensures robust noise margin. |
Key Features
| Feature | Design Value |
|---|---|
| True analog multiplier feedback | Eliminates input-voltage-dependent loop gain variation, enabling stable regulation across 8V–35V input range without compensation redesign. |
| Pulse-by-pulse current limiting | Prevents destructive overcurrent during short-circuit or overload events without external sensing components. |
| Self-boot capability | Enables operation from as low as 5V input in inverting or boost configurations - expands usable topology range beyond standard buck. |
| Integrated 5V reference | Removes need for external feedback resistors, reducing BOM count and improving long-term output accuracy vs. resistor drift. |
| Low thermal resistance package | 50°C/W θJA allows full 1A output in ambient up to 70°C with standard 2-layer PCB - avoids heatsinks in space-constrained designs. |
Applications
| Industrial PLC I/O Power | Embedded Controller Core Supply |
|---|---|
Use Scenario: Providing isolated 5V rail for digital I/O modules in programmable logic controllers operating from 24V DC field bus. IC Role / Device Role / Timing Role: Primary buck regulator converting 24V input to clean, regulated 5V for FPGA configuration, optocoupler drivers, and level-shifting logic. Use Value: Micropower shutdown (<300µA) enables firmware-controlled power gating during sleep cycles, reducing system standby consumption by >95%. | Use Scenario: Generating local 5V supply for ARM Cortex-M7 microcontrollers in edge gateway devices powered from 12V PoE injectors. IC Role / Device Role / Timing Role: On-board switching regulator delivering up to 0.8A with fast transient response to handle CPU burst loads. Use Value: Analog multiplier feedback ensures <1% output deviation during 12V input dips to 9V - maintains deterministic MCU clock timing and ADC reference stability. |
| Test Equipment Auxiliary Rail | Medical Sensor Interface Module |
Use Scenario: Creating low-noise 5V supply for precision DACs and op-amps in portable multimeters and calibration sources. IC Role / Device Role / Timing Role: Fixed-output buck converter with STATUS pin used for automated self-test pass/fail indication during power-up sequence. Use Value: ±5% STATUS window aligns precisely with medical-grade 5V ±250mV tolerance requirements - eliminates need for external supervisor IC. | Use Scenario: Powering isolated analog front-end circuitry (ECG amplifiers, thermistor interfaces) in battery-operated patient monitors. IC Role / Device Role / Timing Role: Efficient 5V source derived from 3.7V Li-ion via inverting topology (VIN=3.7V, VOUT=–5V), then post-regulated to +5V using LT1176CSW-5#TRPBF. Use Value: Self-boot operation at 3.7V input enables full functionality down to 3.2V battery voltage - extends clinical runtime by 18 minutes per charge cycle. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar buck regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTC3605EMSE-5#TRPBF | 2.5MHz synchronous buck, 3A output, integrated MOSFETs, 28µA IQ | Higher frequency enables smaller inductors/capacitors; requires different compensation network | Preferred for space-constrained designs needing >1A or ultra-low IQ; not pin-compatible. |
| LM2678SD-5.0/NOPB | 63kHz asynchronous buck, 5A output, 50mA IQ, D2PAK package | Higher current rating but larger thermal footprint; lacks STATUS and micropower shutdown | Selected when output current exceeds 1A or cost sensitivity outweighs feature set; requires PCB redesign. |
Compared with LTC3605EMSE-5#TRPBF and LM2678SD-5.0/NOPB, the LT1176CSW-5#TRPBF offers unique value in legacy-compatible 100kHz designs requiring precise 5V regulation, STATUS signaling, and sub-10mA quiescent current - making it optimal for industrial retrofit and long-lifecycle programs where board reuse is critical.
Availability
LT1176CSW-5#TRPBF is available at Aetrix Electronics and suitable for industrial PLCs, embedded controller power supplies, test equipment auxiliary rails, and medical sensor interface modules requiring stable component supply across multi-year production cycles.
Supply support for LT1176CSW-5#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 high-reliability analog and power management portfolio. Linear's legacy products emphasize ruggedness, wide temperature operation, and design simplicity for industrial and aerospace use.
The LT1176 family was designed as a monolithic bipolar switching regulator targeting cost-sensitive, medium-power DC/DC conversion where reliability and ease of implementation outweigh ultra-high efficiency or miniaturization - especially in legacy industrial and instrumentation systems.
FAQ
What is the maximum continuous output current supported by the LT1176CSW-5#TRPBF?
The LT1176CSW-5#TRPBF supports up to 0.8A continuous output current under typical conditions (TA = 70°C, 2-layer PCB, 50°C/W θJA). Its 1.2A peak switch current limit and thermal resistance allow brief 1A bursts, but sustained operation above 0.8A requires enhanced cooling. The LT1176CSW-5#TRPBF datasheet specifies 1A nominal rating with derating above 70°C ambient.
Does the LT1176CSW-5#TRPBF require external feedback resistors to set the 5V output?
No, the LT1176CSW-5#TRPBF has an internal 5V reference connected to the FB/SENSE pin, eliminating the need for external feedback resistors. This simplifies layout, improves long-term output accuracy, and reduces component count. The LT1176CSW-5#TRPBF is functionally distinct from the adjustable LT1176CSW version, which requires external resistive division.
Can the LT1176CSW-5#TRPBF operate from a 5V input supply?
Yes - the LT1176CSW-5#TRPBF supports 5V input in inverting or negative-boost configurations via its self-boot feature, though standard buck operation requires minimum 8V input. When used as a positive-to-negative converter (e.g., +5V in → –5V out), the LT1176CSW-5#TRPBF starts reliably and maintains regulation down to 5V VIN, as confirmed in Linear Application Note 44.
What is the purpose of the ILIM pin on the LT1176CSW-5#TRPBF?
On the LT1176CSW-5#TRPBF, the ILIM pin sets the peak switch current limit: open-circuit configures 1.2A, while connecting a resistor (e.g., 7kΩ) raises it to 1.7A. This pin allows safe adaptation to different inductor saturation currents and load fault margins without changing the IC. Unlike many regulators, the LT1176CSW-5#TRPBF uses ILIM for hardware-based current limiting rather than software-configurable thresholds.
How does the STATUS pin on the LT1176CSW-5#TRPBF function in system-level power monitoring?
The STATUS pin on the LT1176CSW-5#TRPBF is an open-collector output that asserts high when the 5V output remains within ±5% of nominal (4.75V–5.25V). With 1.6mA sink capability and 30µs minimum pulse width, it directly drives microcontroller GPIOs or reset supervisors. This enables deterministic power-good sequencing in systems where the LT1176CSW-5#TRPBF powers critical logic blocks.
LT1176CSW-5#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:
- Fixed
- Number of Outputs:
- 1
- Voltage - Input (Min):
- 8V
- Voltage - Input (Max):
- 35V
- Voltage - Output (Min/Fixed):
- 5V
- Voltage - Output (Max):
- -
- 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-5#TRPBF FAQ
1.How can I place an order for LT1176CSW-5#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT1176CSW-5#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-5#TRPBF reliable?
The price and inventory of LT1176CSW-5#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-5#TRPBF is usually 5 days.
3.What payment methods are accepted for LT1176CSW-5#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT1176CSW-5#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT1176CSW-5#TRPBF?
LT1176CSW-5#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT1176CSW-5#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-5#TRPBF?
For technical support, including LT1176CSW-5#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT1176CSW-5#TRPBF requirements.
6.How does Aetrix verify that LT1176CSW-5#TRPBF is sourced from the original manufacturer or authorized distributors?
All LT1176CSW-5#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-5#TRPBF meets industry standards.
7.What is the process for return or replacement of LT1176CSW-5#TRPBF?
All LT1176CSW-5#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LT1176CSW-5#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-5#TRPBF part is unused and in its original packaging.
Return procedure for LT1176CSW-5#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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