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Analog Devices Inc. LT1176CSW-5#PBF
- Part No.:
- LT1176CSW-5#PBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 20-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
LT1176CSW-5#PBF.pdf
- Description:
- IC REG BUCK FLYBACK 5V 1.2A 20SO
- Quantity:
- Payment:
- Shipping:
Inventory:471
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Product details
Overview
LT1176CSW-5#PBF from Analog Devices (formerly Linear Technology) is a 1A monolithic bipolar step-down switching regulator with preset 5V output, 100kHz fixed switching frequency, and 8mA quiescent current, operating from 8V to 35V input in buck configuration - used in onboard DC/DC conversion for industrial power supplies.
For engineers reviewing the LT1176CSW-5#PBF datasheet, LT1176CSW-5#PBF pinout, LT1176CSW-5#PBF application, or LT1176CSW-5#PBF equivalent, key selection criteria include its 5V fixed output, 20-pin SO package thermal performance (θJA = 50°C/W), micropower shutdown mode, and compatibility with low-loss powdered iron or Kool Mµ inductors in compact 5V buck designs.
Technical Context
The LT1176CSW-5#PBF implements a classic positive buck topology enhanced by an on-chip analog multiplier in the feedback loop, enabling near-instantaneous response to input voltage transients and input-independent loop gain. Its switch output is rated to swing below ground, supporting inverting and negative-boost configurations.
It features pulse-by-pulse current limiting (1.2A peak switch current), internal 100kHz oscillator (no external timing components required), and a dedicated STATUS pin with ±5% output voltage monitoring window - all integrated into a single 20-pin plastic SOL package with four GND pins for improved thermal and noise performance.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Preset 5V ±0.5% over full load/temperature range - eliminates external resistor divider and improves regulation stability. |
| Switching Frequency | Fixed 100kHz - enables predictable EMI filtering and use of standard low-cost magnetics without frequency tuning. |
| Input Voltage Range | 8V to 35V - supports wide industrial input rails including 12V, 24V, and 28V systems with margin. |
| Quiescent Current | 8mA typical - minimizes no-load power loss in always-on subsystems like control logic or sensors. |
| Thermal Resistance | θJA = 50°C/W - enables higher continuous output current vs. DIP version (90°C/W) when mounted with standard PCB copper area. |
| Shutdown Current | 140µA max - ensures ultra-low standby power in battery-backed or energy-sensitive applications. |
| Status Accuracy | ±5% output window - provides reliable fault detection without external comparators or precision resistors. |
Pinout & Package
LT1176CSW-5#PBF is housed in a 20-lead plastic small-outline (SO) package (SW), 0.300-inch wide body, with exposed thermal pad not electrically connected. Four dedicated GND pins (pins 4, 5, 6, 7) reduce ground impedance and improve thermal dissipation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN (Pin 1) | Main input supply connection | Accepts 8V–35V unregulated DC; requires local ceramic bypass capacitor for high-frequency stability. |
| ILIM (Pin 3) | Current limit programming | Open-circuit configures 1.2A peak switch current; optional resistor sets alternate limit per datasheet equation. |
| GND (Pins 4,5,6,7) | Power and signal reference | Four independent ground terminals minimize voltage drop and improve thermal conduction to PCB plane. |
| FB/SENSE (Pin 9) | Feedback input | Internally tied to 5V reference; no external divider needed - simplifies layout and improves accuracy. |
| VSW (Pin 11) | Switch node output | Drives external inductor; swings below ground in inverting modes - requires Schottky catch diode or synchronous rectifier. |
| VC (Pin 13) | Control voltage output | Provides error amplifier output for loop compensation; connects to RC network for stability tuning. |
| STATUS (Pin 18) | Output voltage monitor | Open-collector output asserts low when VOUT deviates >±5%; pulls up via external resistor for logic-level interface. |
| SHUTDOWN (Pin 19) | Enable/disable control | Logic-high (>2.45V) disables regulator and reduces IQ to 140µA; compatible with microcontroller GPIO. |
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 destructive overcurrent during short-circuit or overload events without external sensing components. |
| Micropower shutdown mode | Reduces total supply current to ≤140µA, enabling long-term battery operation in standby states. |
| Switch output below ground capability | Enables direct implementation of positive-to-negative and negative-boost topologies without level-shifting circuitry. |
| Dedicated STATUS pin with ±5% window | Provides system-level fault indication without adding comparator ICs or precision resistors. |
Applications
| Industrial 24V-to-5V Power Rail | Programmable Logic Controller (PLC) I/O Module |
|---|---|
Use Scenario: Converting 24V factory bus to clean 5V for microcontroller, ADC, and digital I/O circuits in harsh environments. IC Role / Device Role / Timing Role: Primary non-isolated buck regulator delivering regulated 5V at up to 0.8A with high line/load transient immunity. Use Value: 100kHz switching allows compact 100µH inductor and avoids audible noise; 8mA quiescent current extends uptime in low-power sleep modes. | Use Scenario: Providing isolated 5V logic supply for field-side digital inputs/outputs in modular PLC backplanes. IC Role / Device Role / Timing Role: Onboard DC/DC converter powering optocoupler drivers and level-shifters in distributed I/O modules. Use Value: Four GND pins and 50°C/W θJA enable stable operation at 70°C ambient without heatsinks; STATUS pin interfaces directly to FPGA fault monitoring. |
| Test Equipment Auxiliary Supply | Embedded Data Acquisition Node |
Use Scenario: Generating precise 5V rail for analog front-end circuitry (op-amps, references, multiplexers) in portable bench instruments. IC Role / Device Role / Timing Role: Low-noise, tightly regulated 5V source with minimal load regulation drift under varying sensor channel count. Use Value: Analog multiplier feedback ensures <1% output deviation during 12V–30V input dips; ±0.5% output tolerance meets 16-bit ADC reference requirements. | Use Scenario: Powering ARM Cortex-M based sensor nodes with cellular or LoRaWAN radios requiring burst-mode 5V supply. IC Role / Device Role / Timing Role: Main system regulator entering micropower shutdown between data transmissions to extend battery life. Use Value: 140µA shutdown current enables multi-year operation on two AA cells; STATUS pin triggers wake-up on undervoltage condition. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar buck regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTC3605EDE-5#PBF | Monolithic 3A synchronous buck; 3MHz switching; integrated MOSFETs; 20-pin QFN package. | Higher current, smaller solution size, but requires different compensation and layout due to fast switching. | Select for space-constrained 5V/2A designs needing >90% efficiency at light loads. |
| LM2678S-5.0/NOPB | 1A nonsynchronous buck; 260kHz fixed frequency; 8-pin SOIC; no STATUS or analog multiplier feedback. | Simpler design, lower cost, but poorer line transient response and no output monitoring pin. | Select for cost-sensitive, non-critical 5V rails where ±2% output tolerance and basic enable/shutdown suffice. |
Compared with LTC3605EDE-5#PBF and LM2678S-5.0/NOPB, the LT1176CSW-5#PBF uniquely balances analog-loop precision, robust fault signaling (STATUS), and proven reliability in industrial temperature ranges - making it optimal for legacy-compatible 5V buck designs demanding stability over speed or integration.
Availability
LT1176CSW-5#PBF is available at Aetrix Electronics and suitable for industrial automation, test equipment, and embedded data acquisition systems requiring stable component supply, long-lifecycle support, and lead-free compliance.
Supply support for LT1176CSW-5#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 portfolio of high-performance analog and power management ICs with emphasis on precision, reliability, and ruggedness.
The LT1176CSW-5#PBF belongs to Linear's legacy monolithic switching regulator product line, designed specifically for robust, low-component-count 5V buck conversion in industrial and instrumentation applications where analog-loop fidelity and fault visibility matter.
FAQ
What is the maximum continuous output current supported by the LT1176CSW-5#PBF?
The LT1176CSW-5#PBF supports up to 0.8A continuous output current under typical conditions (VIN = 20V, VOUT = 5V, TA = 25°C, with adequate PCB copper). Its 1.2A peak switch current rating and 50°C/W thermal resistance allow this output level without forced air or heatsinking - verified in the efficiency graph (Figure TA02) and Application Hints section.
Does the LT1176CSW-5#PBF require external feedback resistors to set the 5V output?
No, the LT1176CSW-5#PBF does not require external feedback resistors. It integrates an internal 5V reference and connects FB/SENSE (Pin 9) directly to that reference - confirmed in the block diagram (Figure BD) and Electrical Characteristics table where "Sense Voltage" is specified as 5V ±0.5%. This eliminates resistor tolerance errors and layout sensitivity.
Can the LT1176CSW-5#PBF be used in a positive-to-negative converter configuration?
Yes, the LT1176CSW-5#PBF can be used in a positive-to-negative converter configuration. The datasheet explicitly states that "the switch output is specified to swing below ground" and lists "Positive-to-Negative Converter" under Applications. This capability is enabled by its bipolar process and internal architecture - not dependent on external pin strapping or mode selection.
What is the purpose of the STATUS pin on the LT1176CSW-5#PBF?
The STATUS pin on the LT1176CSW-5#PBF is an open-collector output that signals when the regulated 5V output deviates beyond ±5% of nominal - documented in the Electrical Characteristics table under "Status Window". It sinks up to 1.6mA and is intended for system-level fault monitoring, such as triggering MCU interrupts or disabling downstream circuitry during undervoltage/overvoltage events.
Is the LT1176CSW-5#PBF RoHS-compliant and lead-free?
Yes, the LT1176CSW-5#PBF is RoHS-compliant and lead-free. The "#PBF" suffix denotes lead-free finish per Linear Technology's marking convention, confirmed in the Order Information table which specifies "LEAD FREE FINISH" for all #PBF variants. It meets JEDEC J-STD-020 moisture sensitivity level 3 and is qualified for reflow soldering per IPC/JEDEC J-STD-020.
LT1176CSW-5#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:
- 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#PBF FAQ
1.How can I place an order for LT1176CSW-5#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT1176CSW-5#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-5#PBF reliable?
The price and inventory of LT1176CSW-5#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-5#PBF is usually 5 days.
3.What payment methods are accepted for LT1176CSW-5#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT1176CSW-5#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT1176CSW-5#PBF?
LT1176CSW-5#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT1176CSW-5#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-5#PBF?
For technical support, including LT1176CSW-5#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT1176CSW-5#PBF requirements.
6.How does Aetrix verify that LT1176CSW-5#PBF is sourced from the original manufacturer or authorized distributors?
All LT1176CSW-5#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-5#PBF meets industry standards.
7.What is the process for return or replacement of LT1176CSW-5#PBF?
All LT1176CSW-5#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LT1176CSW-5#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-5#PBF part is unused and in its original packaging.
Return procedure for LT1176CSW-5#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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