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Analog Devices Inc. LT1766IFE-5#TRPBF
- Part No.:
- LT1766IFE-5#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 16-TSSOP (0.173", 4.40mm Width) Exposed Pad
- Datasheet:
-
LT1766IFE-5#TRPBF.pdf
- Description:
- IC REG BUCK 5V 1.5A 16TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:3,538
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Product details
Overview
LT1766IFE-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 delivers high efficiency in industrial power supplies, battery chargers, and distributed systems where wide VIN and thermal robustness are critical.
For engineers reviewing the LT1766IFE-5#TRPBF datasheet, LT1766IFE-5#TRPBF pinout, LT1766IFE-5#TRPBF application, or LT1766IFE-5#TRPBF equivalent, key selection factors include its fixed 5V output, TSSOP-16 thermally enhanced package with exposed GND pad, 25μA shutdown current, and SYNC capability from 228kHz to 700kHz - all validated for –40°C to 125°C operation.
Technical Context
The LT1766IFE-5#TRPBF employs current-mode control with cycle-by-cycle current limiting and a patented architecture that maintains constant 1.5A peak switch current across the full duty cycle range. Its BOOST pin enables saturation of the internal NPN switch, achieving low conduction loss equivalent to a 0.2Ω FET despite bipolar construction.
It integrates oscillator, error amplifier (gm = 2000 μmho), VC clamp (0.9V–2.1V), and dual-threshold shutdown (0.4V/2.38V) with undervoltage lockout. The FB/SENSE pin is internally connected to the 5V output, eliminating external feedback resistors while retaining foldback protection below 0.6V and frequency shifting below 0.8V.
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 12V/24V/48V industrial buses and automotive cold-crank transients |
| 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 (achieved via BOOST pin drive; reduces conduction loss at high VIN/VOUT ratios) |
| Shutdown Current | 25μA max (enables ultra-low-power standby in battery-backed systems) |
| Switching Frequency | 200kHz fixed (±16kHz), synchronizable from 228kHz to 700kHz with logic-level input) |
| Thermal Rating | –40°C to 125°C operating junction temperature (IFE grade; θJA = 45°C/W with exposed pad soldered) |
Pinout & Package
LT1766IFE-5#TRPBF uses a 16-pin thermally enhanced TSSOP package (FE) with exposed GND pad (Pin 17). The package requires soldering the exposed pad to PCB ground plane for thermal performance (θJC = 10°C/W).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| GND (Pins 1, 8, 9, 16, 17) | Power and signal reference ground | Multiple GND pins + exposed pad reduce thermal resistance and minimize ground bounce; must be solidly connected to PCB ground plane |
| SW (Pin 2) | Emitter of internal NPN power switch | Drives inductor; swings from ~–0.8V (clamped by catch diode) to VIN during on-time; high dI/dt node requiring short layout |
| VIN (Pin 4) | Collector of internal NPN switch & primary supply | Supplies control circuitry when BIAS is unconnected; high dI/dt path - requires local ceramic bypass capacitor |
| BOOST (Pin 6) | Switch driver boost voltage input | Accepts voltage ≥VIN+1.8V (min); enables NPN saturation - implemented with external diode + capacitor from SW to BOOST |
| BIAS (Pin 10) | Efficiency-boosting auxiliary supply input | When connected to VOUT (≥3V), shifts bias current from VIN to VOUT, improving efficiency at high VIN/light load |
| VC (Pin 11) | Error amplifier output / current limit comparator input | 0.9V–2.1V operating range; used for loop compensation; can override current limit or force shutdown if pulled to GND |
| FB/SENSE (Pin 12) | 5V output sense input (fixed-output variant) | Internally connected to 5V output; provides foldback current limiting (<0.6V) and frequency reduction (<0.8V) during fault conditions |
| SYNC (Pin 14) | External clock synchronization input | Logic-compatible (1.5V–2.2V min amplitude); accepts 228kHz–700kHz square wave; disables foldback when active |
| SHDN (Pin 15) | Enable/disable control with UVLO | 2.38V threshold enables UVLO; 0.4V threshold forces micropower shutdown (25μA); open-circuit defaults to ON via internal bias |
Key Features
| Feature | Design Value |
|---|---|
| Wide 5.5V–60V input range | Supports direct connection to 48V telecom, 24V industrial, and 12V automotive rails without pre-regulation |
| Integrated 0.2Ω NPN switch | Eliminates external MOSFET; achieves >85% efficiency at 1A/12V→5V without heatsink |
| Thermally enhanced TSSOP-16 | Exposed GND pad (Pin 17) enables θJA = 45°C/W - 3× better than standard SSOP for 1.5A continuous operation |
| Two-threshold shutdown | 2.38V UVLO prevents startup until input stabilizes; 0.4V deep shutdown cuts supply current to 25μA |
| Frequency and current foldback | Reduces switching frequency 5:1 and limits current to <1A when SENSE <0.6V - protects IC and external components during short-circuit |
Applications
| Industrial Power Supply | Battery Charger Control |
|---|---|
Use Scenario: 48V DC distribution bus powering 5V logic, sensors, and I/O modules in PLC cabinets. IC Role / Device Role / Timing Role: Primary non-isolated buck converter delivering regulated 5V at up to 1.5A from variable 48V±10% input. Use Value: Wide VIN tolerance handles brownouts and surges; 25μA shutdown enables remote power cycling without auxiliary rail. | Use Scenario: Charging lead-acid or LiFePO₄ batteries from 24V vehicle alternator with system load powered simultaneously. IC Role / Device Role / Timing Role: Constant-voltage 5V supply for charger microcontroller and level-shifting circuitry during engine cranking. Use Value: Operates down to 5.5V input - survives cold-crank transients; BOOST-assisted switch ensures stable regulation even at 60V load dump peaks. |
| Distributed Power System | Portable Computer Auxiliary Rail |
Use Scenario: Point-of-load conversion in modular test equipment where main 12V/24V bus powers multiple 5V sub-systems. IC Role / Device Role / Timing Role: Local 5V regulator with SYNC input locked to system clock to minimize EMI coupling between boards. Use Value: 228kHz–700kHz synchronization eliminates beat frequencies; TSSOP thermal design allows dense board placement without airflow. | Use Scenario: Secondary 5V rail generation in ruggedized handheld terminals using 12V sealed lead-acid battery. IC Role / Device Role / Timing Role: High-efficiency buck converter enabling >10-hour runtime; BIAS pin connected to 5V output improves light-load efficiency. Use Value: BIAS-assisted operation reduces total input current by ~30% at 100mA load vs. VIN-only supply; 125°C rating supports sealed enclosure operation. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar buck regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTC3642EMSE-5#PBF | 40V max VIN, 2A switch, 3mm × 4mm MSOP; requires external feedback for 5V | Better suited for space-constrained designs with lower VIN; lacks BOOST pin for ultra-high-VIN saturation | Choose LTC3642EMSE-5#PBF when board area is critical and input stays ≤40V; avoid for 48V+ industrial use. |
| LM5164QDRCRQ1 | Automotive-grade (AEC-Q100), 100V VIN, 0.5A switch, integrated BOOT diode; 5V output requires resistor divider | Designed for automotive under-hood environments; lower current rating limits continuous 5V load to ~0.4A | Choose LM5164QDRCRQ1 only for automotive applications requiring AEC-Q100 qualification; not drop-in for LT1766IFE-5#TRPBF's 1.5A capability. |
Compared with LTC3642EMSE-5#PBF and LM5164QDRCRQ1, the LT1766IFE-5#TRPBF uniquely combines 60V input tolerance, 1.5A integrated switch, fixed 5V output, and BOOST-enabled low-RON operation - making it optimal for industrial 48V-to-5V conversion where reliability and thermal margin are prioritized over footprint.
Availability
LT1766IFE-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 long production lifecycles.
Supply support for LT1766IFE-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. (acquired Linear Technology in 2017) is a global leader in high-performance analog, mixed-signal, and power management semiconductors.
The LT1766IFE-5#TRPBF belongs to Linear Technology's legacy monolithic buck regulator product line, engineered for high-voltage industrial and automotive power conversion where wide input range, thermal resilience, and integrated protection are essential.
FAQ
What is the maximum input voltage rating for the LT1766IFE-5#TRPBF?
The LT1766IFE-5#TRPBF has an absolute maximum input voltage (VIN) rating of 60V. Operation above this voltage risks permanent damage. The device is designed for reliable continuous operation across its full 5.5V–60V input range, including transient overvoltage events common in 48V industrial and automotive systems. Always observe derating guidelines per the datasheet's Absolute Maximum Ratings table.
Does the LT1766IFE-5#TRPBF require external feedback resistors to set the 5V output?
No. The LT1766IFE-5#TRPBF features an internal resistor divider optimized for 5V output, so the FB/SENSE pin (Pin 12) connects directly to the output. This eliminates external resistor selection errors and improves accuracy versus adjustable variants like the LT1766IFE#TRPBF. The SENSE pin also enables built-in foldback protection during output faults.
How does the BOOST pin function in the LT1766IFE-5#TRPBF?
The BOOST pin (Pin 6) provides a voltage higher than VIN to the base of the internal NPN power switch, enabling full saturation and reducing effective on-resistance to 0.2Ω. It is implemented with an external diode and capacitor from SW to BOOST. Without BOOST, switch losses increase significantly - the pin is mandatory for specified efficiency and 1.5A current capability across the full input range.
Can the LT1766IFE-5#TRPBF be synchronized to an external clock?
Yes. The LT1766IFE-5#TRPBF supports external synchronization via the SYNC pin (Pin 14), accepting logic-level square waves from 228kHz to 700kHz with 10%–90% duty cycle. During synchronization, internal foldback protection remains active unless the external clock amplitude falls below 1.5V. This feature reduces EMI in noise-sensitive systems and enables multi-regulator phase alignment.
What thermal considerations apply to the LT1766IFE-5#TRPBF's TSSOP package?
The LT1766IFE-5#TRPBF uses a thermally enhanced TSSOP-16 (FE) package with an exposed GND pad (Pin 17) that must be soldered to a large PCB copper plane. With proper layout, θJA drops to 45°C/W - critical for sustaining 1.5A continuous output at high ambient temperatures. Failure to connect the exposed pad degrades thermal performance by >2× and may trigger thermal shutdown under load.
LT1766IFE-5#TRPBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 16-TSSOP (0.173", 4.40mm Width) Exposed Pad
- 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-TSSOP-EP
LT1766IFE-5#TRPBF FAQ
1.How can I place an order for LT1766IFE-5#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT1766IFE-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 LT1766IFE-5#TRPBF reliable?
The price and inventory of LT1766IFE-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 LT1766IFE-5#TRPBF is usually 5 days.
3.What payment methods are accepted for LT1766IFE-5#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT1766IFE-5#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT1766IFE-5#TRPBF?
LT1766IFE-5#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT1766IFE-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 LT1766IFE-5#TRPBF?
For technical support, including LT1766IFE-5#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT1766IFE-5#TRPBF requirements.
6.How does Aetrix verify that LT1766IFE-5#TRPBF is sourced from the original manufacturer or authorized distributors?
All LT1766IFE-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 LT1766IFE-5#TRPBF meets industry standards.
7.What is the process for return or replacement of LT1766IFE-5#TRPBF?
All LT1766IFE-5#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LT1766IFE-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 LT1766IFE-5#TRPBF part is unused and in its original packaging.
Return procedure for LT1766IFE-5#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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