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Analog Devices Inc. LT1766EFE-5#TRPBF
- Part No.:
- LT1766EFE-5#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 16-TSSOP (0.173", 4.40mm Width) Exposed Pad
- Datasheet:
-
LT1766EFE-5#TRPBF.pdf
- Description:
- IC REG BUCK 5V 1.5A 16TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:4,032
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Product details
Overview
LT1766EFE-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 and battery-charged systems requiring stable 5V rails from wide-input sources.
For engineers reviewing the LT1766EFE-5#TRPBF datasheet, LT1766EFE-5#TRPBF pinout, LT1766EFE-5#TRPBF application, or LT1766EFE-5#TRPBF equivalent, this page provides verified package mapping, thermal-aware TSSOP-16 pin functions, confirmed 5V SENSE-based regulation, and two validated alternative parts for 5V buck conversion in high-voltage environments.
Technical Context
The LT1766EFE-5#TRPBF uses current-mode control with cycle-by-cycle current limiting and a dedicated 200kHz oscillator. Its internal NPN switch is driven via BOOST pin voltage boosting to ensure saturation across full duty cycle range, enabling low conduction loss (0.2Ω typical) even at high input voltages.
It features dual shutdown thresholds (2.38V UVLO and 0.4V deep shutdown), synchronous capability (228kHz–700kHz), and feedback foldback protection-reducing switching frequency below 0.8V FB/SENSE and current limit below 0.6V-to manage power dissipation during short-circuit events.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 5V ±1.2% (SENSE pin directly connected to VOUT; no external divider required) |
| Input Voltage Range | 5.5V to 60V - supports 24V/48V industrial buses and automotive cold-crank transients |
| Switch Current Limit | 1.5A peak - maintained over full duty cycle range via patented circuitry |
| Switch On-Resistance | 0.2Ω typical - achieved via BOOST-driven saturation, reducing conduction loss vs. standard bipolar switches |
| Quiescent Supply Current | 2.5mA - enables efficient light-load operation without BIAS pin connection |
| Shutdown Current | 25μA - ensures ultra-low standby power in battery-backed systems |
| Switching Frequency | 200kHz fixed - simplifies EMI filtering; externally synchronizable from 228kHz to 700kHz |
Pinout & Package
LT1766EFE-5#TRPBF is housed in a 16-pin thermally enhanced TSSOP package (FE grade) with exposed GND pad (Pin 17) soldered to PCB for improved thermal performance (θJA = 45°C/W, 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 ground impedance and thermal resistance; load ground must tie directly to these pins for optimal regulation |
| SW (Pin 2) | Emitter of internal NPN power switch | Drives inductor; swings from near-VIN (on) to ~–0.8V (off); requires external catch diode clamping |
| VIN (Pin 4) | Collector of internal NPN switch & primary supply | Supplies internal bias when BIAS pin unused; high dI/dt path requires short trace to input capacitor and SW |
| BOOST (Pin 6) | Switch driver boost supply node | Connected to external capacitor+diode network to generate >VIN voltage for switch saturation; minimum boost voltage = 1.8V @ ISW ≤ 1.5A |
| BIAS (Pin 10) | Efficiency-optimized auxiliary supply input | When tied to regulated 5V output, shifts internal bias current from VIN to VOUT, improving efficiency at high VIN/light loads |
| VC (Pin 11) | Error amplifier output / current limit comparator input | Used for loop compensation; also serves as current clamp point (0.9V–2.1V range); can be driven to GND to disable switching |
| FB/SENSE (Pin 12) | 5V output sensing node | Fixed 5V version uses internal resistor divider; SENSE pin connects directly to VOUT; enables foldback protection below 0.8V |
| SYNC (Pin 14) | External clock synchronization input | Logic-level compatible (1.5V–2.2V min amplitude); accepts 228kHz–700kHz signals with 10%–90% duty cycle |
| SHDN (Pin 15) | Enable/disable control with dual thresholds | 2.38V threshold enables UVLO; 0.4V threshold forces micropower shutdown (25μA IQ) |
Key Features
| Feature | Design Value |
|---|---|
| Wide 5.5V–60V input range | Supports 24V/36V/48V industrial, telecom, and automotive battery systems without pre-regulation |
| Integrated 0.2Ω NPN switch | Eliminates need for external MOSFET and gate driver; reduces BOM count and layout complexity |
| Thermally enhanced TSSOP-16 | Exposed GND pad enables 10°C/W junction-to-case thermal resistance for reliable 1.5A operation |
| Current-mode control architecture | Delivers fast transient response and inherent cycle-by-cycle overcurrent protection without sense resistor |
| Frequency and current foldback | Reduces switching frequency and peak current during short-circuit events to limit IC and external component power dissipation |
Applications
| Industrial Power Supply | Automotive Battery Charger |
|---|---|
Use Scenario: Generating stable 5V rail from 24V or 48V DC distribution bus in PLC I/O modules or sensor hubs. IC Role / Device Role / Timing Role: Primary buck regulator providing regulated 5V for microcontrollers, ADCs, and communication interfaces. Use Value: 200kHz fixed frequency simplifies EMI filter design; 60V max input withstands load-dump transients up to ISO 7637-2 Pulse 5a. | Use Scenario: Charging 12V lead-acid batteries from vehicle alternator (up to 16V) while powering auxiliary 5V loads. IC Role / Device Role / Timing Role: Buck converter stepping down alternator output to regulated 5V for USB-powered accessories or telematics modules. Use Value: 5.5V minimum input allows operation during cranking (≥6V); shutdown current <30μA prevents battery drain when engine off. |
| Portable Medical Device | Distributed Telecom Power |
Use Scenario: Powering handheld ultrasound or glucose meter from dual-cell Li-ion (6V–8.4V) or 9V alkaline battery. IC Role / Device Role / Timing Role: Efficient 5V step-down regulator delivering up to 1.2A continuous load with minimal heat rise in compact enclosure. Use Value: 2.5mA quiescent current extends battery life; thermal TSSOP package enables natural convection cooling without heatsink. | Use Scenario: Local 5V supply for remote radio unit (RRU) control logic powered from –48V telecom rectifier. IC Role / Device Role / Timing Role: High-voltage buck converter converting –48V (absolute 48V) to isolated 5V via intermediate stage or direct with proper isolation. Use Value: 60V absolute maximum input rating accommodates reverse-polarity protection diodes and line surges; SYNC pin enables system-wide clock alignment. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar 5V buck conversion applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTC3605EDE-5#TRPBF | 42V max input, 3A output, 3mm × 4mm DFN, requires external compensation | Better suited for higher-current, space-constrained designs; lacks BOOST pin and fixed 0.2Ω switch | Select when >1.5A load current or smaller footprint is required; verify thermal derating at 60V input |
| LM5165QPWRQ1 | 65V max input, 150mA output, integrated FET, 2.1MHz switching | Lower current, higher frequency, automotive AEC-Q100 qualified; no BOOST pin or thermal pad | Select for automotive-grade 5V bias rails under 150mA; not suitable for 1.5A loads or high-efficiency 60V operation |
Compared with LTC3605EDE-5#TRPBF and LM5165QPWRQ1, LT1766EFE-5#TRPBF uniquely combines 60V input tolerance, 1.5A capability, integrated BOOST-driven NPN switch, and thermally optimized TSSOP package-making it optimal for industrial 5V supplies where reliability at high VIN and moderate load current is critical.
Availability
LT1766EFE-5#TRPBF is available at Aetrix Electronics and suitable for industrial power supplies, automotive battery chargers, and portable medical devices requiring stable component supply with guaranteed long-term availability and full temperature-range validation (0°C to 125°C).
Supply support for LT1766EFE-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 full product support, documentation, and manufacturing continuity for the LT® series.
The LT1766 family was designed specifically for high-input-voltage, medium-current DC/DC buck conversion in harsh environments-emphasizing robustness, thermal performance, and integrated protection without external components.
FAQ
What is the maximum input voltage rating for LT1766EFE-5#TRPBF?
The LT1766EFE-5#TRPBF has an absolute maximum input voltage rating of 60V on the VIN pin. This allows reliable operation from 24V, 36V, and 48V industrial buses, including transient conditions like ISO 7637-2 load dump pulses. Operation above 60V risks permanent damage per Absolute Maximum Ratings.
Does LT1766EFE-5#TRPBF require an external feedback resistor divider?
No. The LT1766EFE-5#TRPBF integrates the feedback divider for 5V output; the FB pin functions as a SENSE pin and must be connected directly to the regulated 5V output. External resistors are unnecessary and would disrupt the fixed 5V regulation accuracy.
How does the BOOST pin function in LT1766EFE-5#TRPBF?
The BOOST pin on LT1766EFE-5#TRPBF supplies elevated drive voltage to the internal NPN switch base, enabling saturation and achieving 0.2Ω typical on-resistance. It requires an external bootstrap capacitor and diode connected between VIN and BOOST; minimum boost voltage is 1.8V at 1.5A switch current.
What thermal considerations apply to LT1766EFE-5#TRPBF in continuous 1.5A operation?
The LT1766EFE-5#TRPBF uses a thermally enhanced TSSOP package with exposed GND pad (Pin 17). For continuous 1.5A operation at 60V input, the exposed pad must be soldered to ≥2 cm² copper area to maintain junction temperature ≤125°C. Thermal resistance is θJA = 45°C/W with proper PCB layout.
Can LT1766EFE-5#TRPBF synchronize to an external clock?
Yes. The LT1766EFE-5#TRPBF supports external synchronization via the SYNC pin, accepting logic-level inputs from 228kHz to 700kHz with 10%–90% duty cycle. This enables EMI reduction through frequency alignment and eliminates beat frequencies in multi-rail systems using LT1766EFE-5#TRPBF.
LT1766EFE-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:
- 0°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 16-TSSOP-EP
LT1766EFE-5#TRPBF FAQ
1.How can I place an order for LT1766EFE-5#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT1766EFE-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 LT1766EFE-5#TRPBF reliable?
The price and inventory of LT1766EFE-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 LT1766EFE-5#TRPBF is usually 5 days.
3.What payment methods are accepted for LT1766EFE-5#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT1766EFE-5#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT1766EFE-5#TRPBF?
LT1766EFE-5#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT1766EFE-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 LT1766EFE-5#TRPBF?
For technical support, including LT1766EFE-5#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT1766EFE-5#TRPBF requirements.
6.How does Aetrix verify that LT1766EFE-5#TRPBF is sourced from the original manufacturer or authorized distributors?
All LT1766EFE-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 LT1766EFE-5#TRPBF meets industry standards.
7.What is the process for return or replacement of LT1766EFE-5#TRPBF?
All LT1766EFE-5#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LT1766EFE-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 LT1766EFE-5#TRPBF part is unused and in its original packaging.
Return procedure for LT1766EFE-5#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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