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Analog Devices Inc. LT1766HFE#TRPBF
- Part No.:
- LT1766HFE#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 16-TSSOP (0.173", 4.40mm Width) Exposed Pad
- Datasheet:
-
LT1766HFE#TRPBF.pdf
- Description:
- IC REG BUCK ADJ 1.5A 16TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:1,114
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Product details
Overview
LT1766HFE#TRPBF from Analog Devices (formerly Linear Technology) is a high-voltage, current-mode synchronous buck switching regulator IC designed for industrial and automotive power conversion. It delivers 1.5A peak switch current at 200kHz fixed frequency, supports 5.5V–60V input, features 0.2Ω on-resistance, 1.2V feedback reference, and operates across –40°C to 140°C junction temperature - enabling robust 5V step-down regulation in harsh-environment battery chargers and distributed power systems.
For engineers reviewing the LT1766HFE#TRPBF datasheet, LT1766HFE#TRPBF pinout, LT1766HFE#TRPBF application, or LT1766HFE#TRPBF equivalent, key selection criteria include its wide-input-range DC/DC conversion capability, thermally enhanced TSSOP-16 package with exposed GND pad, cycle-by-cycle current limiting, and compatibility with external synchronization from 228kHz to 700kHz - all critical for high-reliability power supply design under thermal stress.
Technical Context
The LT1766HFE#TRPBF implements a current-mode control architecture with integrated 1.5A NPN power switch and internal 200kHz oscillator. Its patented circuitry maintains constant peak switch current across full duty cycle range, while BOOST pin-driven saturation enables low 0.2Ω on-resistance at 1.5A - reducing conduction loss without requiring external MOSFETs.
It uses dual shutdown thresholds (0.4V for micropower shutdown, 2.38V for UVLO), supports BIAS pin operation for improved efficiency at high VIN/light loads, and provides FB/SENSE pin-based foldback protection (frequency reduction below 0.8V, current limit reduction below 0.6V) - ensuring safe operation during short-circuit or startup faults.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 5.5V to 60V - enables direct integration into 24V/48V industrial buses and automotive battery systems without pre-regulation. |
| Switch Current Limit | 1.5A (guaranteed over –40°C to 140°C) - defines maximum sustainable output current before foldback activation. |
| Switch On-Resistance | 0.2Ω (typical at ISW = 1.5A) - minimizes I²R losses and thermal rise in high-current buck stages. |
| Feedback Reference | 1.219V (±1.2% over temp) - sets regulated output via external resistor divider; enables precise 5V or adjustable outputs. |
| Operating Junction Temp | –40°C to 140°C - qualified for under-hood automotive and high-ambient industrial environments. |
| Shutdown Current | 25μA (max) - ensures ultra-low standby power in always-on systems like telematics or sensor nodes. |
| SYNC Frequency Range | 228kHz to 700kHz - allows EMI-sensitive designs to avoid noise bands or synchronize with system clocks. |
Pinout & Package
LT1766HFE#TRPBF is housed in a 16-lead plastic TSSOP package with exposed backside thermal pad (Pin 17, GND), optimized for high-power dissipation in compact layouts. Thermal resistance θJA = 45°C/W, θJC = 10°C/W (to exposed pad).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| GND (Pins 1, 8, 9, 16, 17) | Power and signal reference ground | Multiple GND pins + exposed pad must be soldered to PCB ground plane to ensure stable regulation and thermal performance. |
| SW (Pin 2) | Switch emitter node | Connects to inductor; swings from ~–0.8V (off) to VIN (on); requires low-inductance path to catch diode and input capacitor. |
| VIN (Pin 4) | Input power collector | Supplies internal bias circuitry; carries high dI/dt; must be decoupled locally with low-ESR ceramic capacitor. |
| BOOST (Pin 6) | Switch drive voltage booster | Connected to external boost capacitor/diode; raises drive voltage above VIN to saturate internal NPN switch. |
| BIAS (Pin 10) | Efficiency-boosting auxiliary supply | When tied to VOUT ≥3V, shifts internal bias current from VIN to VOUT - improving efficiency at high VIN/light load. |
| VC (Pin 11) | Error amplifier output / current limit setpoint | Used for loop compensation; clamped between 0.9V (light load) and 2.1V (full load); can override regulation or force shutdown. |
| FB/SENSE (Pin 12) | Output voltage sensing / fault detection | For LT1766 (not -5 variant): sets VOUT via resistor divider; triggers foldback below 0.8V (freq) and 0.6V (current). |
| SYNC (Pin 14) | External clock synchronization input | Logic-level compatible; accepts 228kHz–700kHz square wave; disables internal oscillator when driven. |
| SHDN (Pin 15) | Enable/disable control with dual thresholds | 2.38V = UVLO lockout; 0.4V = deep shutdown; open = default enabled via internal bias current. |
Key Features
| Feature | Design Value |
|---|---|
| Wide input voltage range | 5.5V–60V operation eliminates need for upstream pre-regulators in 24V/48V industrial and 12V–48V automotive systems. |
| Thermally enhanced TSSOP | Exposed GND pad (Pin 17) reduces θJC to 10°C/W - enabling 1.5A continuous operation in high-ambient environments. |
| Current-mode control | Provides inherent cycle-by-cycle current limiting and fast transient response without external compensation components. |
| BOOST pin saturation drive | Enables 0.2Ω effective on-resistance using internal NPN switch - achieving FET-like efficiency without discrete high-side MOSFET. |
| Dual-threshold shutdown | Separate 2.38V (UVLO) and 0.4V (deep shutdown) thresholds allow flexible power sequencing and fail-safe system control. |
Applications
| Automotive Battery Charger | Industrial 48V DC Distribution |
|---|---|
Use Scenario: Charging 12V lead-acid or LiFePO₄ batteries from a 24V–48V vehicle bus under engine cranking or alternator ripple conditions. IC Role / Device Role / Timing Role: Primary buck regulator providing regulated 14.4V/13.8V charging voltage with current limiting and thermal robustness. Use Value: 60V absolute max input withstands load-dump transients; 140°C rating survives under-hood temperatures; foldback protects during battery short-circuit. | Use Scenario: Local point-of-load conversion from 48V intermediate bus to 5V for PLC I/O modules, motor drivers, or fieldbus controllers. IC Role / Device Role / Timing Role: High-efficiency, isolated-output DC/DC stage delivering stable 5V at up to 1.2A with minimal external components. Use Value: 0.2Ω switch RDS(on) enables >90% efficiency at 1A/48V→5V; SYNC input allows EMI alignment with master clock in multi-rail systems. |
| Portable Medical Equipment Power | Ruggedized IoT Edge Node |
Use Scenario: Powering FPGA, microcontroller, and sensor subsystems in battery-operated ultrasound or patient monitors with variable input (12V–36V Li-ion pack). IC Role / Device Role / Timing Role: Main system regulator converting battery voltage to clean 5V rail with low-noise operation and reliable startup down to 5.5V. Use Value: 25μA shutdown current extends battery life; minimum 5.5V start-up supports deep-discharge recovery; BIAS pin improves light-load efficiency. | Use Scenario: Providing 5V power to cellular modem, GPS, and environmental sensors in outdoor gateways exposed to –40°C to +85°C ambient. IC Role / Device Role / Timing Role: Primary DC/DC converter operating across full industrial temperature range with guaranteed 1.5A output capability. Use Value: –40°C to 140°C qualification ensures reliability without derating; exposed-pad TSSOP maintains thermal margin in sealed enclosures. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar buck regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTC3642EMSE#PBF | 40V max input, 2A switch, 3mm × 4mm MSOP; no BOOST pin; requires external MOSFETs | Better suited for space-constrained designs needing higher current but lower input voltage | Select if input ≤40V and board area is critical; avoid for 48V+ or load-dump environments. |
| LM5164QPWPRQ1 | 65V max input, 1A switch, integrated high-side MOSFET; 4.5V min start-up; AEC-Q100 Grade 1 | Designed specifically for automotive; lacks BIAS pin and dual-threshold SHDN | Prefer for automotive production where AEC-Q100 compliance is mandatory; not drop-in due to different pinout and control logic. |
Compared with LTC3642EMSE#PBF and LM5164QPWPRQ1, the LT1766HFE#TRPBF uniquely combines 60V input tolerance, 1.5A integrated switch with BOOST-assisted saturation, –40°C to 140°C operation, and dual-threshold shutdown - making it optimal for high-reliability industrial and extended-temperature automotive auxiliary supplies where component count, thermal resilience, and transient robustness are prioritized over ultra-small footprint or automotive qualification.
Availability
LT1766HFE#TRPBF is available at Aetrix Electronics and suitable for industrial power supplies, automotive battery management systems, and ruggedized IoT edge devices requiring stable component supply across extended temperature ranges and long product lifecycles.
Supply support for LT1766HFE#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 technical and manufacturing continuity for legacy Linear power products.
The LT1766HFE#TRPBF belongs to Linear's high-voltage monolithic buck regulator family, engineered for demanding industrial, transportation, and energy infrastructure applications where wide input range, thermal resilience, and integrated protection are essential.
FAQ
What is the maximum input voltage rating for the LT1766HFE#TRPBF?
The LT1766HFE#TRPBF has an absolute maximum input voltage rating of 60V on the VIN pin. This rating is validated across its full operating junction temperature range of –40°C to 140°C, enabling use in 48V industrial buses and automotive systems subject to load-dump transients. Operation above 60V risks permanent damage per Absolute Maximum Ratings.
Does the LT1766HFE#TRPBF support fixed 5V output without external resistors?
No - the LT1766HFE#TRPBF is the adjustable-output version with 1.219V feedback reference; it requires an external resistor divider on the FB pin to set output voltage. The fixed 5V variant is the LT1766-5 (e.g., LT1766IFE-5#TRPBF). Using LT1766HFE#TRPBF for 5V requires R1 = 15.4kΩ and R2 = 4.99kΩ per datasheet guidance.
How does the BOOST pin function in the LT1766HFE#TRPBF?
The BOOST pin on the LT1766HFE#TRPBF provides elevated gate drive voltage to the internal NPN power switch, enabling saturation and achieving 0.2Ω on-resistance. It connects to an external bootstrap capacitor and diode charged from VIN; without BOOST, switch VCE(sat) would be ~1.5V, drastically reducing efficiency and thermal margin.
What thermal considerations apply to the LT1766HFE#TRPBF's exposed pad?
Pin 17 is the exposed GND pad and must be soldered to a large PCB copper plane to achieve θJC = 10°C/W. Inadequate thermal connection causes junction temperature to exceed 140°C under 1.5A load, triggering overtemperature protection and degrading lifetime. Manufacturer recommends minimum 250mm² copper area with ≥4 thermal vias to inner ground layers.
Can the LT1766HFE#TRPBF be synchronized to an external clock?
Yes - the LT1766HFE#TRPBF supports external synchronization via the SYNC pin (Pin 14), accepting logic-level square waves from 228kHz to 700kHz with 10%–90% duty cycle. When driven, the internal 200kHz oscillator disables, allowing EMI reduction and timing coordination in multi-regulator systems.
LT1766HFE#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:
- Adjustable
- Number of Outputs:
- 1
- Voltage - Input (Min):
- 5.5V
- Voltage - Input (Max):
- 60V
- Voltage - Output (Min/Fixed):
- 1.2V
- Voltage - Output (Max):
- 57.6V
- Current - Output:
- 1.5A
- Frequency - Switching:
- 200kHz
- Synchronous Rectifier:
- No
- Operating Temperature:
- -40°C ~ 140°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 16-TSSOP-EP
LT1766HFE#TRPBF FAQ
1.How can I place an order for LT1766HFE#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT1766HFE#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 LT1766HFE#TRPBF reliable?
The price and inventory of LT1766HFE#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT1766HFE#TRPBF is usually 5 days.
3.What payment methods are accepted for LT1766HFE#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT1766HFE#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT1766HFE#TRPBF?
LT1766HFE#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT1766HFE#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 LT1766HFE#TRPBF?
For technical support, including LT1766HFE#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT1766HFE#TRPBF requirements.
6.How does Aetrix verify that LT1766HFE#TRPBF is sourced from the original manufacturer or authorized distributors?
All LT1766HFE#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 LT1766HFE#TRPBF meets industry standards.
7.What is the process for return or replacement of LT1766HFE#TRPBF?
All LT1766HFE#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LT1766HFE#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 LT1766HFE#TRPBF part is unused and in its original packaging.
Return procedure for LT1766HFE#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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