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Analog Devices Inc. LT1766IGN-5#TRPBF
- Part No.:
- LT1766IGN-5#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 16-SSOP (0.154", 3.90mm Width)
- Datasheet:
-
LT1766IGN-5#TRPBF.pdf
- Description:
- IC REG BUCK 5V 1.5A 16SSOP
- Quantity:
- Payment:
- Shipping:
Inventory:4,101
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Product details
Overview
LT1766IGN-5#TRPBF from Analog Devices (formerly Linear Technology) is a 5V fixed-output, 200kHz monolithic buck switching regulator with 1.5A peak switch current, 5.5V–60V input range, and integrated 0.2Ω NPN power switch. It operates in current-mode control for fast transient response and delivers stable 5V output for industrial power rails, battery chargers, and distributed systems.
For engineers reviewing the LT1766IGN-5#TRPBF datasheet, LT1766IGN-5#TRPBF pinout, LT1766IGN-5#TRPBF application, or LT1766IGN-5#TRPBF equivalent, key selection criteria include its fixed 5V output, 16-pin SSOP package with exposed ground pad, –40°C to 125°C operating junction temperature, and synchronization capability from 228kHz to 700kHz.
Technical Context
The LT1766IGN-5#TRPBF implements current-mode control with cycle-by-cycle current limiting and a dedicated SENSE pin (replacing FB functionality) for direct 5V output monitoring. Its patented boost-capacitor-driven saturation architecture maintains 0.2Ω switch on-resistance across full duty cycle and temperature range.
It features dual shutdown thresholds (0.4V for micropower shutdown, 2.38V for UVLO), frequency foldback below 0.8V SENSE voltage, and current limit foldback below 0.6V - all enabling robust short-circuit protection without external circuitry.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 5V ±1.2% (SENSE pin tied directly to VOUT; no external divider required) |
| Input Voltage Range | 5.5V to 60V - supports wide-range industrial, automotive, and battery-derived supplies |
| Switch Current Limit | 1.5A peak (guaranteed over full duty cycle and –40°C to 125°C junction temperature) |
| Switch On-Resistance | 0.2Ω typical (enables high efficiency at high VIN/VOUT ratios via BOOST-saturation) |
| Switching Frequency | 200kHz fixed (±12kHz), synchronizable from 228kHz to 700kHz via logic-level SYNC input) |
| Shutdown Current | 25μA max (ensures ultra-low standby power in battery-backed or energy-sensitive systems) |
| Thermal Performance | θJA = 85°C/W (SSOP package); exposed GND pad (Pin 17) must be soldered for thermal reliability) |
Pinout & Package
LT1766IGN-5#TRPBF uses a 16-lead plastic SSOP package with exposed backside GND pad (Pin 17). The package requires soldering of Pin 17 to PCB ground plane for thermal management and electrical stability.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| GND (Pins 1, 8, 9, 16, 17) | Power and signal reference ground | Multiple GND pins reduce ground impedance; Pin 17 is thermally enhanced exposed pad requiring PCB soldering |
| SW (Pin 2) | Emitter of internal NPN power switch | Drives inductor; swings from ~–0.8V (off) to VIN (on); requires catch diode or synchronous rectifier |
| VIN (Pin 4) | Collector of internal NPN switch & primary supply | Accepts 5.5V–60V; high dI/dt node - demands short, low-inductance path to input capacitor and SW |
| BOOST (Pin 6) | Boost capacitor drive node | Generates >VIN voltage to saturate NPN switch; enables 0.2Ω RON performance |
| BIAS (Pin 10) | Efficiency-optimized bias supply input | When tied to VOUT ≥3V, shifts internal bias current from VIN to VOUT, improving light-load efficiency |
| VC (Pin 11) | Error amplifier output / current limit comparator input | Used for loop compensation; clamped between 0.9V (light load) and 2.1V (full load); can override regulation |
| SENSE (Pin 12) | Fixed-output voltage sense input | Replaces FB function; internally connected to 5V output; triggers foldback if <0.8V (freq) or <0.6V (current) |
| SYNC (Pin 14) | External oscillator synchronization input | Logic-compatible (10–90% duty); locks internal 200kHz oscillator to external clock up to 700kHz |
| SHDN (Pin 15) | Enable/shutdown control with dual thresholds | 2.38V = UVLO enable; 0.4V = full micropower shutdown (25μA IQ) |
Key Features
| Feature | Design Value |
|---|---|
| Integrated 0.2Ω NPN switch | Enables high efficiency at high input voltages without external MOSFET or gate driver |
| Current-mode control architecture | Delivers fast transient response and inherent cycle-by-cycle overcurrent protection |
| Frequency & current foldback | Reduces switching frequency and peak current during short-circuit or low-VOUT conditions to limit power dissipation |
| Thermally enhanced SSOP package | Exposed GND pad (Pin 17) lowers θJC to 25°C/W - critical for 1.5A continuous operation in compact layouts |
| Wide-input, fixed-output simplicity | Eliminates feedback resistor network; SENSE pin simplifies layout and improves accuracy vs. resistor-divider drift |
Applications
| Industrial Power Supply | Battery Charger Control |
|---|---|
Use Scenario: Providing regulated 5V rail for PLC I/O modules, sensor transmitters, and fieldbus interfaces operating from 24V or 48V DC bus. IC Role / Device Role / Timing Role: Primary non-isolated buck converter delivering clean, stable 5V at up to 1.5A with high input voltage tolerance. Use Value: Eliminates need for pre-regulator stages; 60V max input withstands load-dump transients in 24V industrial systems. | Use Scenario: Charging Li-ion or lead-acid batteries from variable solar or vehicle alternator sources (12V–48V). IC Role / Device Role / Timing Role: Constant-voltage stage regulator supplying 5V to charge management IC or microcontroller supervisor. Use Value: Fixed 5V output ensures precise charging reference; UVLO (2.38V SHDN threshold) prevents startup until input stabilizes. |
| Distributed Power System | Automotive Subsystem Rail |
Use Scenario: Local point-of-load conversion in telecom or server backplanes where 12V/24V/48V intermediate bus powers multiple 5V peripherals. IC Role / Device Role / Timing Role: Compact, thermally robust buck regulator placed near load to minimize IR drop and noise coupling. Use Value: SSOP package with exposed pad enables 1.5A delivery in space-constrained locations; SYNC allows system-wide clock alignment. | Use Scenario: Powering infotainment displays, ADAS camera modules, or telematics units from vehicle battery (9V–16V nominal, up to 60V during load dump). IC Role / Device Role / Timing Role: High-reliability 5V supply meeting AEC-Q100 stress requirements (–40°C to 125°C junction). Use Value: Guaranteed operation across full automotive temperature range; 25μA shutdown current extends battery life in parked mode. |
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 | 4MHz constant-frequency current-mode buck; 3A output; 2.7V–5.5V input; integrated MOSFETs; no BOOST pin | Optimized for low-VIN, high-efficiency portable apps; not suitable for >6V input or 60V transients | Select only for low-input, high-frequency, high-current designs where size and efficiency outweigh input voltage range needs. |
| LM5164QPWPRQ1 | 100V input, 1.5A buck; 2.2MHz sync; integrated high-side FET; no internal BOOST; 5V fixed option available (LM5164Q05PWPRQ1) | Higher input rating (100V) but lacks BOOST-assisted saturation - higher RDS(on) limits efficiency at high VIN | Prefer for automotive 100V load-dump immunity; accept lower efficiency above 40V input vs. LT1766IGN-5#TRPBF's 0.2Ω switch. |
Compared with LTC3605EDE-5#PBF and LM5164Q05PWPRQ1, the LT1766IGN-5#TRPBF uniquely combines 60V input tolerance, 0.2Ω BOOST-saturated switch, fixed 5V output, and –40°C to 125°C guaranteed operation - making it optimal for ruggedized industrial and automotive subsystems where efficiency at high VIN and thermal reliability are critical.
Availability
LT1766IGN-5#TRPBF is available at Aetrix Electronics and suitable for industrial power supplies, battery charger control circuits, and distributed power systems requiring stable component supply across extended temperature ranges and high-reliability manufacturing.
Supply support for LT1766IGN-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, Inc. (ADI) is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, formed through the acquisition of Linear Technology in 2017.
The LT1766 family was designed by Linear Technology specifically for high-input-voltage, fixed-output DC/DC conversion in harsh environments - emphasizing thermal robustness, transient resilience, and simplified design for industrial and transportation applications.
FAQ
What is the maximum input voltage rating for the LT1766IGN-5#TRPBF?
The LT1766IGN-5#TRPBF has an absolute maximum input voltage (VIN) rating of 60V, with guaranteed operation from 5.5V to 60V. This makes it suitable for applications exposed to industrial transients or automotive load-dump events. Exceeding 60V risks permanent damage per Absolute Maximum Ratings.
Does the LT1766IGN-5#TRPBF require external feedback resistors to set its output voltage?
No - the LT1766IGN-5#TRPBF is a fixed 5V output variant. Its SENSE pin (Pin 12) connects directly to the output, eliminating external resistors. This improves accuracy and reduces component count versus adjustable versions like the LT1766IGN#TRPBF, which uses FB with a voltage divider.
How does the BOOST pin function in the LT1766IGN-5#TRPBF?
The BOOST pin (Pin 6) drives an external capacitor-diode charge pump to generate a voltage higher than VIN, enabling full saturation of the internal NPN switch. This achieves a low 0.2Ω on-resistance - critical for maintaining high efficiency when stepping down from high input voltages like 48V to 5V.
What thermal considerations apply to the LT1766IGN-5#TRPBF SSOP package?
The LT1766IGN-5#TRPBF uses a 16-lead SSOP with exposed GND pad (Pin 17). That pad must be soldered to a large PCB copper area to achieve θJA = 85°C/W and prevent thermal shutdown. Without proper grounding of Pin 17, junction temperature rise will exceed specifications under 1.5A load.
Can the LT1766IGN-5#TRPBF be synchronized to an external clock?
Yes - the LT1766IGN-5#TRPBF supports external synchronization via its SYNC pin (Pin 14). It accepts logic-level inputs (10–90% duty cycle) and locks to frequencies from 228kHz to 700kHz, allowing system-level clock alignment and EMI reduction in multi-regulator designs.
LT1766IGN-5#TRPBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 16-SSOP (0.154", 3.90mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Function:
- Step-Down
- Output Configuration:
- Positive
- Topology:
- Buck
- Output Type:
- Fixed
- Number of Outputs:
- 1
- Voltage - Input (Min):
- 5.5V
- Voltage - Input (Max):
- 60V
- Voltage - Output (Min/Fixed):
- 5V
- Voltage - Output (Max):
- -
- Current - Output:
- 1.5A
- Frequency - Switching:
- 200kHz
- Synchronous Rectifier:
- No
- Operating Temperature:
- -40°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 16-SSOP
LT1766IGN-5#TRPBF FAQ
1.How can I place an order for LT1766IGN-5#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT1766IGN-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 LT1766IGN-5#TRPBF reliable?
The price and inventory of LT1766IGN-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 LT1766IGN-5#TRPBF is usually 5 days.
3.What payment methods are accepted for LT1766IGN-5#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT1766IGN-5#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT1766IGN-5#TRPBF?
LT1766IGN-5#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT1766IGN-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 LT1766IGN-5#TRPBF?
For technical support, including LT1766IGN-5#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT1766IGN-5#TRPBF requirements.
6.How does Aetrix verify that LT1766IGN-5#TRPBF is sourced from the original manufacturer or authorized distributors?
All LT1766IGN-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 LT1766IGN-5#TRPBF meets industry standards.
7.What is the process for return or replacement of LT1766IGN-5#TRPBF?
All LT1766IGN-5#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LT1766IGN-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 LT1766IGN-5#TRPBF part is unused and in its original packaging.
Return procedure for LT1766IGN-5#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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