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Analog Devices Inc. LT1766EFE#TRPBF
- Part No.:
- LT1766EFE#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 16-TSSOP (0.173", 4.40mm Width) Exposed Pad
- Datasheet:
-
LT1766EFE#TRPBF.pdf
- Description:
- IC REG BUCK ADJ 1.5A 16TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:2,367
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Product details
Overview
LT1766EFE#TRPBF from Analog Devices (formerly Linear Technology) is a monolithic 200kHz current-mode buck switching regulator with integrated 1.5A/0.2Ω NPN power switch, 5.5V–60V input range, and adjustable output via external feedback divider. It delivers regulated DC-DC conversion in industrial power supplies, battery chargers, and distributed systems requiring high-voltage tolerance and fast transient response.
For engineers reviewing the LT1766EFE#TRPBF datasheet, LT1766EFE#TRPBF pinout, LT1766EFE#TRPBF application, or LT1766EFE#TRPBF equivalent, key selection criteria include verified 1.5A peak switch current, confirmed 200kHz fixed-frequency operation, validated thermal performance in TSSOP-16 with exposed pad, and documented cycle-by-cycle current limiting for robust short-circuit protection.
Technical Context
The LT1766EFE#TRPBF implements current-mode control with an internal 200kHz oscillator, error amplifier (gm = 2000 μ℧, gain = 400 V/V), and peak-current comparator referenced to the VC pin. Its architecture uses BOOST-driven saturation of the on-die NPN switch to achieve low 0.2Ω on-resistance across full duty cycle range.
It features dual shutdown thresholds (0.4V for micropower shutdown, 2.38V for UVLO), programmable synchronization (228–700 kHz), and FB-pin-based foldback protection-reducing switching frequency below 0.8V and current limit below 0.6V during overload or startup. BIAS pin operation enables efficiency optimization at high VIN-to-VOUT ratios.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 5.5V to 60V - supports wide-range industrial, automotive, and battery-fed inputs without external pre-regulation. |
| Switch Current Limit | 1.5A (min) - guarantees continuous 1A output delivery with margin for transients and derating. |
| Switching Frequency | 200kHz (typical) - enables compact magnetics while maintaining EMI control and loop stability. |
| On-Resistance (RON) | 0.2Ω (typical) - achieved via BOOST-assisted saturation, minimizing conduction loss at high load currents. |
| Feedback Reference | 1.219V (typical) - precise voltage reference enabling accurate output regulation with standard resistor dividers. |
| Shutdown Current | 25μA (max) - ensures ultra-low quiescent draw in standby mode for battery longevity. |
| Thermal Range | –40°C to +125°C junction - qualified for extended industrial environments with no derating up to 125°C. |
Pinout & Package
LT1766EFE#TRPBF is housed in a 16-lead thermally enhanced TSSOP package (FE grade) with exposed GND pad (Pin 17) soldered to PCB for optimal thermal dissipation (θJA = 45°C/W).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| GND (Pins 1, 8, 9, 16, 17) | Power and signal reference ground | Multiple GND pins reduce ground impedance; exposed pad (Pin 17) must be soldered to PCB ground plane for thermal and electrical integrity. |
| SW (Pin 2) | Emitter of internal NPN power switch | Connects to inductor; swings from near-GND to VIN during operation; requires catch diode clamping for negative flyback. |
| VIN (Pin 4) | Collector of internal NPN switch & primary supply | High dI/dt node - demands short, low-inductance path to input capacitor and SW to minimize voltage spikes. |
| BOOST (Pin 6) | Boost capacitor drive terminal | Provides >VIN voltage to saturate internal switch; requires external diode + capacitor network (e.g., 1N4148W + 100nF). |
| BIAS (Pin 10) | Efficiency-optimized bias supply input | When tied to VOUT ≥3V, shifts internal bias current from VIN to VOUT, improving efficiency at high input voltages. |
| VC (Pin 11) | Error amplifier output / current limit threshold | Used for loop compensation; clamped between 0.9V (light load) and 2.1V (full load); can override regulation or enable shutdown. |
| FB (Pin 12) | Feedback input / voltage sense node | Accepts 1.219V reference; sets output via resistor divider; enables foldback protection when voltage drops below 0.8V or 0.6V. |
| SYNC (Pin 14) | External clock synchronization input | Logic-level compatible (10–90% duty); locks internal oscillator from 228kHz to 700kHz to avoid beat frequencies in multi-rail systems. |
| SHDN (Pin 15) | Enable/disable control with dual thresholds | 2.38V UVLO prevents startup until VIN is stable; 0.4V forces deep shutdown (25μA IQ); open-circuit defaults to enabled. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated 1.5A NPN power switch | Eliminates external MOSFET and driver, reducing BOM count and layout complexity in space-constrained designs. |
| BOOST-assisted switch saturation | Enables 0.2Ω effective RON using bipolar process - achieves FET-like conduction loss without larger die area. |
| Current-mode control architecture | Delivers inherent cycle-by-cycle current limiting and superior transient response vs. voltage-mode counterparts. |
| Programmable frequency synchronization | Allows deterministic EMI management and noise cancellation in multi-converter systems via external clock injection. |
| FB-pin foldback protection | Automatically reduces switching frequency and peak current during short-circuit or low-VOUT conditions to limit power dissipation. |
Applications
| Industrial Power Supply | Battery Charger Control |
|---|---|
Use Scenario: Regulating 24V or 48V bus down to 5V/3.3V for PLC I/O modules and sensor interfaces in factory automation. IC Role / Device Role / Timing Role: Primary buck controller delivering isolated, stable DC rails with high input voltage tolerance and thermal resilience. Use Value: 60V max input withstands load-dump transients; 125°C rating supports uncooled enclosure operation; 200kHz switching enables small 47μH inductors. | Use Scenario: Charging 12V/24V lead-acid or LiFePO4 batteries from variable solar or vehicle alternator sources. IC Role / Device Role / Timing Role: Constant-current/constant-voltage (CC/CV) stage controller with programmable charge voltage and foldback protection. Use Value: Wide 5.5–60V input accommodates fluctuating source voltages; FB foldback prevents thermal runaway during battery short or deep discharge. |
| Distributed Power System | Automotive Off-Battery Supply |
Use Scenario: Local point-of-load (POL) conversion in telecom base stations or server backplanes where multiple independent rails are required. IC Role / Device Role / Timing Role: Standalone POL regulator synchronized to system clock to suppress inter-rail beat frequencies. Use Value: SYNC pin enables deterministic 228–700kHz locking; low 2.5mA quiescent current minimizes idle power loss across dozens of nodes. | Use Scenario: Powering infotainment or ADAS subsystems directly from vehicle battery (9–16V nominal, up to 60V during load dump). IC Role / Device Role / Timing Role: High-reliability buck converter with UVLO and thermal protection for harsh automotive environments. Use Value: 2.38V SHDN UVLO prevents brownout operation; –40°C to +125°C qualification meets AEC-Q200 stress requirements; exposed-pad TSSOP aids under-hood thermal management. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar buck regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTC3632EMSE#PBF | 42V max input, 1.2A output, 3mm × 4mm MSOP; synchronous rectification; higher efficiency at light loads. | Lower current and voltage rating; better suited for compact, low-power embedded systems than high-stress industrial use. | Select when footprint and light-load efficiency outweigh need for 60V rating and 1.5A surge capability. |
| LM5164QPWPRQ1 | 65V max input, 1A output, 1.5MHz switching, integrated high-side MOSFET; automotive-grade (AEC-Q100). | Higher frequency enables smaller passives but increases EMI filtering burden; lower current limit restricts peak load handling. | Prefer for new automotive designs requiring AEC-Q100 certification and 1.5MHz operation, accepting 1A limit and added gate-drive complexity. |
Compared with LTC3632EMSE#PBF and LM5164QPWPRQ1, LT1766EFE#TRPBF offers the widest input range (60V), highest guaranteed switch current (1.5A), and proven thermal robustness in TSSOP-16 - making it optimal for legacy industrial and high-transient environments where reliability trumps miniaturization.
Availability
LT1766EFE#TRPBF is available at Aetrix Electronics and suitable for industrial power supplies, battery chargers, and automotive off-battery systems requiring stable component supply, long-term lifecycle support, and guaranteed parametric performance over temperature.
Supply support for LT1766EFE#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 power management semiconductors, formed through the acquisition of Linear Technology in 2017.
The LT1766 series belongs to ADI's legacy high-voltage monolithic buck regulator product line, designed specifically for rugged industrial, transportation, and energy infrastructure applications demanding wide input range, integrated power switch reliability, and thermal resilience without external drivers.
FAQ
What is the maximum input voltage supported by the LT1766EFE#TRPBF?
The LT1766EFE#TRPBF supports an absolute maximum input voltage of 60V, with guaranteed operation from 5.5V to 60V. This wide range allows direct connection to 48V industrial buses, automotive batteries (including load-dump transients), and unregulated AC/DC outputs without external pre-regulation. Exceeding 60V risks permanent damage per Absolute Maximum Ratings.
Does the LT1766EFE#TRPBF require an external BOOST capacitor and diode?
Yes, the LT1766EFE#TRPBF requires an external BOOST capacitor and diode (e.g., 100nF ceramic + 1N4148W) connected between BOOST (Pin 6) and SW (Pin 2). This network generates a voltage higher than VIN to fully saturate the internal NPN switch, achieving the specified 0.2Ω on-resistance. Omitting this circuit degrades efficiency and increases thermal stress.
Can the LT1766EFE#TRPBF be synchronized to an external clock?
Yes, the LT1766EFE#TRPBF supports external synchronization via its SYNC (Pin 14) input. It accepts logic-level signals (10–90% duty cycle) from 228kHz to 700kHz, enabling EMI reduction and deterministic timing in multi-converter systems. The internal oscillator locks to the external frequency without phase jitter or startup delay.
What is the purpose of the BIAS pin on the LT1766EFE#TRPBF?
The BIAS (Pin 10) on the LT1766EFE#TRPBF improves efficiency by allowing the IC's internal bias circuitry to draw operating current from the regulated output (≥3V) instead of VIN. When tied to VOUT, it reduces total input current - especially beneficial at high VIN-to-VOUT ratios (e.g., 48V→5V), where efficiency gains exceed 5%.
How does the LT1766EFE#TRPBF protect against short-circuit conditions?
The LT1766EFE#TRPBF employs dual-foldback protection triggered by the FB pin: when FB voltage drops below 0.8V, switching frequency reduces ~5:1; below 0.6V, peak switch current limit folds back to <1A. This limits power dissipation in the IC, external diode, and inductor during sustained shorts - preventing thermal runaway without requiring external circuitry.
LT1766EFE#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:
- 0°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 16-TSSOP-EP
LT1766EFE#TRPBF FAQ
1.How can I place an order for LT1766EFE#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT1766EFE#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#TRPBF reliable?
The price and inventory of LT1766EFE#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#TRPBF is usually 5 days.
3.What payment methods are accepted for LT1766EFE#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT1766EFE#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT1766EFE#TRPBF?
LT1766EFE#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT1766EFE#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#TRPBF?
For technical support, including LT1766EFE#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT1766EFE#TRPBF requirements.
6.How does Aetrix verify that LT1766EFE#TRPBF is sourced from the original manufacturer or authorized distributors?
All LT1766EFE#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#TRPBF meets industry standards.
7.What is the process for return or replacement of LT1766EFE#TRPBF?
All LT1766EFE#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LT1766EFE#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#TRPBF part is unused and in its original packaging.
Return procedure for LT1766EFE#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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