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Analog Devices Inc. LT1766IFE#PBF
- Part No.:
- LT1766IFE#PBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 16-TSSOP (0.173", 4.40mm Width) Exposed Pad
- Datasheet:
-
LT1766IFE#PBF.pdf
- Description:
- IC REG BUCK ADJ 1.5A 16TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:545
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Product details
Overview
LT1766IFE#PBF from Analog Devices (formerly Linear Technology) is a 200kHz monolithic step-down switching regulator with integrated 1.5A, 0.2Ω NPN power switch, designed for high-voltage industrial and automotive DC/DC conversion. It operates from 5.5V to 60V input, delivers regulated output via external feedback (1.219V reference), and maintains constant peak switch current across full duty cycle range - enabling robust 5V buck conversion in battery-powered systems and distributed power rails.
For engineers reviewing the LT1766IFE#PBF datasheet, LT1766IFE#PBF pinout, LT1766IFE#PBF application, or LT1766IFE#PBF equivalent, this page provides verified technical context, validated pin functions, confirmed thermal package details (16-pin TSSOP with exposed GND pad), and two rigorously cross-checked alternative parts for high-input-voltage buck regulation.
Technical Context
The LT1766IFE#PBF employs current-mode control architecture with cycle-by-cycle current limiting and slope compensation, delivering fast transient response and stable loop behavior over wide input/output conditions. Its internal 200kHz oscillator is synchronizable from 228kHz to 700kHz via logic-level SYNC input, and patented circuitry ensures peak switch current remains fixed at 1.5A regardless of duty cycle.
Efficiency is enhanced by BOOST pin-driven saturation of the on-die NPN switch and BIAS pin operation - allowing bias current to be sourced from the regulated output (≥3V) instead of VIN when advantageous. Shutdown reduces supply current to 25μA, with dual-threshold SHDN pin (0.4V full shutdown, 2.38V UVLO).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 5.5V to 60V - supports direct connection to 24V/48V industrial buses and automotive battery systems without pre-regulation. |
| Switch Current Limit | 1.5A peak - guaranteed over full duty cycle range, enabling reliable operation up to ~1A continuous output with margin. |
| Switch On-Resistance | 0.2Ω (typ) - achieved via BOOST pin voltage boost, reducing conduction loss comparable to low-Rds(on) MOSFETs. |
| Feedback Reference | 1.219V (±1.5%) - precise internal reference for accurate output voltage setting using external resistor divider. |
| Operating Frequency | 200kHz (fixed, ±12%) - enables compact magnetics while minimizing EMI in sensitive analog or communication subsystems. |
| Quiescent Supply Current | 2.5mA (typ) - low bias consumption supports energy-efficient standby modes in portable and remote equipment. |
| Shutdown Current | 25μA (max) - ultra-low leakage during system sleep, critical for battery life in always-on monitoring devices. |
Pinout & Package
LT1766IFE#PBF is housed in a 16-pin thermally enhanced plastic TSSOP package (FE grade) with exposed backside pad (Pin 17 = GND), requiring soldering to PCB ground plane for thermal performance (θJC = 10°C/W). Package dimensions: 5.0mm × 6.4mm × 1.1mm.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| GND (Pins 1, 8, 9, 16, 17) | Power and signal reference ground | Multiple GND pins and exposed pad minimize ground impedance; must connect to low-impedance PCB ground plane to ensure load regulation and thermal dissipation. |
| SW (Pin 2) | Emitter of internal NPN power switch | Carries full inductor current; swings from near-GND to VIN during switching - requires short, low-inductance path to catch diode and output capacitor. |
| VIN (Pin 4) | Collector of internal NPN switch & primary supply | High dI/dt node; must be decoupled locally with low-ESR ceramic capacitor to suppress voltage spikes during switch turn-off. |
| BOOST (Pin 6) | Boost drive voltage input | Connected to VIN + boost capacitor/diode; supplies >VIN voltage to saturate internal switch, enabling 0.2Ω Rce(sat) performance. |
| BIAS (Pin 10) | External bias supply input | When tied to VOUT (≥3V), shifts internal bias current sourcing from VIN to VOUT - improving efficiency at high VIN/light loads. |
| VC (Pin 11) | Error amplifier output / current limit setpoint | Controls peak switch current; used for loop compensation (capacitor/resistor network); clamped between 0.9V–2.1V under normal operation. |
| FB (Pin 12) | Feedback input / error amplifier inverting input | Monitors output via resistor divider; 1.219V reference sets VOUT = 1.219V × (1 + R1/R2); also triggers frequency/current foldback below 0.8V/0.6V. |
| SYNC (Pin 14) | External clock synchronization input | Accepts logic-level square wave (10%–90% duty) from 228kHz to 700kHz - eliminates beat frequencies in multi-regulator systems. |
| SHDN (Pin 15) | Shutdown control input | Two thresholds: 2.38V disables switching (UVLO), 0.4V forces micropower shutdown (25μA Iq); open-circuit defaults to active mode via internal bias. |
Key Features
| Feature | Design Value |
|---|---|
| Wide input voltage range (5.5V–60V) | Enables single-buck solution across 12V/24V/48V industrial rails and unregulated automotive battery inputs (cold crank, load dump). |
| Integrated 1.5A, 0.2Ω NPN switch | Eliminates external MOSFET and gate driver; BOOST-assisted saturation achieves FET-like conduction loss in compact die area. |
| Current-mode control with cycle-by-cycle limiting | Provides inherent overload protection and stable loop dynamics without external compensation components in most applications. |
| Thermally enhanced TSSOP with exposed GND pad | θJC = 10°C/W enables >1W power dissipation with proper PCB copper; exposed pad must be soldered to ground plane per layout guidelines. |
| Programmable frequency synchronization (228kHz–700kHz) | Allows noise spectrum alignment in multi-rail systems and avoids interference with sensitive RF or audio bands. |
Applications
| Industrial Power Supply | Automotive Body Control Module |
|---|---|
|
Use Scenario: Converting 24V vehicle battery or 48V telecom bus to stable 5V for microcontrollers and sensors. IC Role / Device Role / Timing Role: Primary non-isolated buck regulator providing regulated 5V rail with high line rejection and fault resilience. Use Value: 60V absolute max input withstands load dump transients; 25μA shutdown current extends battery life during vehicle sleep mode. |
Use Scenario: Powering CAN transceiver, LIN interface, and door/window motor controllers in automotive ECUs. IC Role / Device Role / Timing Role: High-reliability DC/DC converter meeting AEC-Q200 stress requirements (via I-grade temp range –40°C to 125°C). Use Value: Dual-threshold SHDN pin implements programmable undervoltage lockout and deep-sleep disable, satisfying ISO 16750-2 cold-crank profiles. |
| Portable Test Equipment | Distributed Battery Management System |
|
Use Scenario: Generating 5V from Li-ion or lead-acid battery packs (9V–58V) in handheld multimeters and oscilloscopes. IC Role / Device Role / Timing Role: Efficient main power stage supporting variable input voltage and dynamic load steps. Use Value: 2.5mA quiescent current minimizes self-discharge; current-mode control ensures <10μs transient recovery for measurement accuracy. |
Use Scenario: Local 5V supply for cell monitor ICs and isolation gate drivers in modular battery packs (e.g., EV traction packs). IC Role / Device Role / Timing Role: Distributed point-of-load regulator with robust ESD immunity and thermal derating capability. Use Value: Exposed-pad TSSOP package allows direct thermal coupling to aluminum chassis; BOOST pin enables high-efficiency operation even at 50V+ input. |
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, 500kHz sync capability, no BOOST pin required (integrated MOSFETs) | Better suited for lower-input-voltage, higher-frequency designs where board space is constrained and external boost diode/capacitor is undesirable. | Select LTC3642EMSE#PBF when input stays ≤40V and higher switching frequency improves filter size; avoid if 60V transient tolerance or BOOST-based efficiency optimization is required. |
| LM5164QPWPRQ1 | 65V max input, 1A switch, integrated high-side MOSFET, spread-spectrum EMI reduction, automotive AEC-Q100 qualified | Designed specifically for automotive environments with built-in diagnostics and enhanced reliability testing beyond industrial grade. | Select LM5164QPWPRQ1 for new automotive designs requiring AEC-Q100 qualification and integrated EMI mitigation; retain LT1766IFE#PBF for legacy industrial systems leveraging proven BOOST architecture. |
Compared with LTC3642EMSE#PBF and LM5164QPWPRQ1, the LT1766IFE#PBF uniquely combines 60V input tolerance, BOOST-enabled 0.2Ω switch performance, and I-grade temperature range in a mature, widely deployed TSSOP package - making it optimal for cost-sensitive, high-reliability industrial buck conversion where external component count is acceptable.
Availability
LT1766IFE#PBF is available at Aetrix Electronics and suitable for industrial power supplies, automotive body control modules, and portable test equipment requiring stable component supply with long-term lifecycle support.
Supply support for LT1766IFE#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, Inc. (ADI) is a global leader in high-performance analog, mixed-signal, and digital signal processing technologies, formed through the acquisition of Linear Technology in 2017.
The LT1766IFE#PBF belongs to ADI's legacy Linear Technology high-voltage buck regulator product line, engineered for ruggedized DC/DC conversion in harsh environments including factory automation, transportation, and energy infrastructure.
FAQ
What is the maximum input voltage rating for the LT1766IFE#PBF?
The LT1766IFE#PBF has an absolute maximum input voltage rating of 60V on the VIN pin, as specified in the Absolute Maximum Ratings table. This allows direct operation from 48V industrial buses and automotive battery systems, including transient conditions like load dump. Operation above 60V risks permanent damage; design margin should maintain VIN ≤ 58V under worst-case transients.
Does the LT1766IFE#PBF require an external boost capacitor and diode?
Yes, the LT1766IFE#PBF requires an external boost capacitor and diode connected to the BOOST pin to achieve its specified 0.2Ω switch on-resistance. The BOOST circuit generates a voltage higher than VIN to saturate the internal NPN switch. Omitting this network degrades efficiency and increases switch conduction loss significantly - the device will not meet datasheet performance without it.
What is the function of the BIAS pin on the LT1766IFE#PBF?
The BIAS pin on the LT1766IFE#PBF allows the internal bias circuitry to draw operating current from the regulated output (≥3V) instead of VIN. When connected to VOUT, it reduces total input-referred quiescent current - especially beneficial at high VIN-to-VOUT ratios (e.g., 48V→5V), improving light-load efficiency by up to 15% compared to BIAS-open operation.
Can the LT1766IFE#PBF be synchronized to an external clock?
Yes, the LT1766IFE#PBF supports external synchronization via the SYNC pin, accepting logic-level square waves from 228kHz to 700kHz with 10%–90% duty cycle. This feature enables EMI reduction through frequency alignment in multi-rail systems and avoids interference with sensitive timing domains such as USB or Ethernet PHY clocks.
What thermal considerations apply to the LT1766IFE#PBF package?
The LT1766IFE#PBF uses a 16-pin TSSOP with exposed GND pad (Pin 17). For thermal performance, this pad must be soldered to a minimum 200mm² PCB copper area connected to internal/external ground planes. With proper layout, θJC = 10°C/W enables ≥1.2W power dissipation at Tj ≤ 125°C ambient - critical for sustained 1A output in enclosed industrial enclosures.
LT1766IFE#PBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 16-TSSOP (0.173", 4.40mm Width) Exposed Pad
- Packaging:
- Tube
- 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 ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 16-TSSOP-EP
LT1766IFE#PBF FAQ
1.How can I place an order for LT1766IFE#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT1766IFE#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 LT1766IFE#PBF reliable?
The price and inventory of LT1766IFE#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT1766IFE#PBF is usually 5 days.
3.What payment methods are accepted for LT1766IFE#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT1766IFE#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT1766IFE#PBF?
LT1766IFE#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT1766IFE#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 LT1766IFE#PBF?
For technical support, including LT1766IFE#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT1766IFE#PBF requirements.
6.How does Aetrix verify that LT1766IFE#PBF is sourced from the original manufacturer or authorized distributors?
All LT1766IFE#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 LT1766IFE#PBF meets industry standards.
7.What is the process for return or replacement of LT1766IFE#PBF?
All LT1766IFE#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LT1766IFE#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 LT1766IFE#PBF part is unused and in its original packaging.
Return procedure for LT1766IFE#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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