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Analog Devices Inc. LT1766EGN#TRPBF
- Part No.:
- LT1766EGN#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 16-SSOP (0.154", 3.90mm Width)
- Datasheet:
-
LT1766EGN#TRPBF.pdf
- Description:
- IC REG BUCK ADJ 1.5A 16SSOP
- Quantity:
- Payment:
- Shipping:
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Product details
Overview
LT1766EGN#TRPBF from Analog Devices (formerly Linear Technology) is a 200kHz monolithic step-down switching regulator IC with integrated 1.5A/0.2Ω NPN power switch, 5.5V–60V input range, and adjustable 1.22V feedback reference. It delivers regulated DC output in industrial power supplies requiring high-voltage tolerance and fast transient response.
For engineers reviewing the LT1766EGN#TRPBF datasheet, LT1766EGN#TRPBF pinout, LT1766EGN#TRPBF application, or LT1766EGN#TRPBF equivalent, key selection factors include its current-mode control architecture, BOOST-pin-driven saturation for low conduction loss, cycle-by-cycle current limiting, and thermally enhanced 16-pin SSOP package with exposed ground pad.
Technical Context
The LT1766EGN#TRPBF implements constant-frequency current-mode control with an internal 200kHz oscillator, error amplifier (gm = 2000 μ℧), and peak-current comparator referenced to the VC pin. Its patented circuitry maintains 1.5A peak switch current across full duty cycle range (90–96%), enabling stable operation under wide VIN/VOUT ratios.
It uses a BOOST capacitor to drive the internal NPN switch into saturation-reducing effective on-resistance to 0.2Ω-and draws bias current from either VIN or VOUT via the BIAS pin to optimize efficiency at high input voltages. Shutdown logic includes dual-threshold UVLO (2.38V lockout, 0.4V deep shutdown) and 25μA quiescent current.
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 (min) - ensures reliable delivery of ≥1A continuous load current with margin for transients and startup surges. |
| Switch On-Resistance | 0.2Ω (typ) - achieved via BOOST-pin-assisted saturation, reducing conduction loss and thermal stress vs. standard bipolar switches. |
| Feedback Reference | 1.219V (typ) - precise internal reference enables accurate output voltage setting via external resistor divider (e.g., 5V, 12V, 15V). |
| Switching Frequency | 200kHz (typ) - fixed frequency simplifies EMI filtering; externally synchronizable from 228kHz to 700kHz for noise-sensitive applications. |
| Supply Current | 2.5mA (typ) - low quiescent draw enables efficient operation in battery-backed or always-on systems. |
| Shutdown Current | 25μA (max) - ultra-low off-state leakage preserves energy in standby or fault-recovery modes. |
Pinout & Package
The LT1766EGN#TRPBF is housed in a 16-pin plastic SSOP package (GN suffix) with exposed ground pad (Pin 17) soldered to PCB for thermal management. θJA = 85°C/W; θJC (Pin 8) = 25°C/W.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| GND (Pins 1, 8, 9, 16) | Power and signal reference ground | Multiple GND pins reduce ground impedance; must be connected directly to low-inductance ground plane to maintain load regulation and thermal performance. |
| SW (Pin 2) | Emitter of internal NPN power switch | Drives inductor; swings from near-GND to VIN during operation; requires external catch diode and careful layout to manage dI/dt-induced voltage spikes. |
| VIN (Pin 4) | Collector of internal NPN switch + bias supply input | Primary high-voltage input; powers internal circuitry when BIAS pin is unconnected; high dI/dt node demanding short, low-inductance path to input capacitor. |
| BOOST (Pin 6) | Boost capacitor drive terminal | Enables switch saturation by providing >VIN gate drive; requires external capacitor+diode network; minimum boost voltage = 1.8V (for ISW ≤ 1.5A). |
| BIAS (Pin 10) | Efficiency-optimized bias supply input | When tied to regulated output (≥3V), shifts internal bias current from VIN to VOUT, improving efficiency at high VIN/light loads. |
| VC (Pin 11) | Error amplifier output / current limit threshold input | Controls peak switch current; clamped between 0.9V (light load) and 2.1V (full load); can be driven to ground for shutdown. |
| FB (Pin 12) | Feedback input for output voltage sensing | Accepts 1.219V reference; sets output via external resistor divider; also enables foldback protection (frequency/current reduction below 0.8V/0.6V). |
| SYNC (Pin 14) | External clock synchronization input | Logic-level compatible (1.5–2.2V min amplitude); accepts 228kHz–700kHz square wave to eliminate beat frequencies in multi-rail systems. |
| SHDN (Pin 15) | Enable/disable control with dual thresholds | 2.38V = UVLO activation (prevents startup until VIN valid); 0.4V = full micropower shutdown (25μA IQ). |
Key Features
| Feature | Design Value |
|---|---|
| Current-mode control architecture | Delivers fast transient response and inherent loop stability without complex compensation; eliminates need for type-II/III networks in most designs. |
| Patented peak-current maintenance | Guarantees 1.5A switch current limit across full 90–96% duty cycle range-critical for high-VIN/low-VOUT conversion (e.g., 48V→5V). |
| BOOST-pin-assisted saturation | Reduces effective switch RON to 0.2Ω, cutting conduction loss by >50% vs. non-boosted bipolar switches at 1A load. |
| Integrated foldback protection | Automatically reduces switching frequency (5:1) and peak current (<1A) when FB < 0.8V/0.6V-limiting power dissipation during short-circuit faults. |
| Thermally enhanced SSOP package | 16-pin GN package includes exposed ground pad (Pin 17) soldered to PCB, lowering θJA to 85°C/W for sustained 1A operation in compact layouts. |
Applications
| Industrial Power Supply | Automotive Body Control Module |
|---|---|
Use Scenario: Regulating 48V rail to 5V/3.3V for PLC I/O modules, sensor interfaces, and fieldbus controllers in factory automation. IC Role / Device Role / Timing Role: Primary buck converter delivering isolated, ripple-controlled DC power with UVLO and thermal robustness for harsh environments. Use Value: 60V absolute max rating and –40°C to 125°C operating range ensure reliability in unregulated industrial bus applications without external TVS or LDO pre-regulators. | Use Scenario: Powering microcontrollers, CAN transceivers, and LED drivers in vehicle door modules, seat controls, and lighting nodes. IC Role / Device Role / Timing Role: High-input-voltage DC-DC converter handling cold-crank (4.6V min) and load-dump (60V surge) conditions per ISO 7637-2. Use Value: Dual SHDN thresholds (2.38V UVLO + 0.4V shutdown) enable controlled power sequencing; 25μA shutdown current extends battery life during vehicle sleep mode. |
| Battery-Powered Test Equipment | Distributed Telecom Power |
Use Scenario: Generating stable 5V/12V outputs from 12–36V Li-ion or lead-acid battery packs in portable oscilloscopes, multimeters, and data loggers. IC Role / Device Role / Timing Role: Efficient step-down regulator with BIAS pin optimization to maximize runtime when VIN ≫ VOUT (e.g., 36V→5V @ 500mA). Use Value: 2.5mA typical supply current and 0.2Ω switch RON yield >88% efficiency at 1A/12V input, extending usable battery capacity by >15% vs. legacy controllers. | Use Scenario: Local point-of-load conversion in 48V telecom shelves, powering FPGA I/O banks, SerDes, and analog front-ends. IC Role / Device Role / Timing Role: Synchronizable 200kHz buck regulator enabling deterministic EMI alignment across multiple rails in dense backplane systems. Use Value: SYNC pin compatibility with 228–700kHz clocks allows harmonic stacking to avoid sensitive RF bands; TSSOP/SSOP footprint supports high-density PCB layouts. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar buck regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTC3631EMSE#PBF | 40V max input, 1.2A switch, 3mm × 4mm MSOP package, no BOOST pin required (integrated MOSFET) | Better suited for space-constrained, lower-voltage designs; lacks 60V rating and external sync capability | Select when input ≤40V and board area is critical; not drop-in due to different pinout, control scheme, and no BOOST dependency. |
| LM5164QPWPRQ1 | 100V max input, 0.6A switch, integrated high-side MOSFET, spread-spectrum EMI reduction | Higher voltage tolerance but lower current; designed for automotive AEC-Q100 Grade 1 (–40°C to 125°C) | Choose for automotive-grade 100V systems needing lower IQ (14μA) and EMI compliance; not pin-compatible and lacks VC pin access for loop tuning. |
Compared with LTC3631EMSE#PBF and LM5164QPWPRQ1, the LT1766EGN#TRPBF uniquely combines 60V operation, 1.5A current capability, external BOOST control for optimized efficiency, and full VC pin accessibility for custom loop compensation-making it optimal for industrial and telecom applications where voltage headroom, thermal management, and design flexibility are prioritized over ultra-small footprint or automotive qualification.
Availability
LT1766EGN#TRPBF is available at Aetrix Electronics and suitable for industrial power supplies, automotive body electronics, and distributed telecom systems requiring stable component supply, long-term lifecycle support, and guaranteed temperature-grade performance.
Supply support for LT1766EGN#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 LT1766EGN#TRPBF belongs to ADI's legacy Linear Technology high-voltage buck regulator product line, engineered specifically for rugged industrial, automotive, and telecom power conversion where wide input range, thermal resilience, and predictable fault behavior are essential.
FAQ
What is the maximum input voltage rating for the LT1766EGN#TRPBF?
The LT1766EGN#TRPBF has an absolute maximum input voltage rating of 60V on the VIN pin, with guaranteed operation from 5.5V to 60V. This makes the LT1766EGN#TRPBF suitable for direct connection to 48V industrial buses and automotive battery systems experiencing load dump transients up to 60V.
Does the LT1766EGN#TRPBF require an external BOOST capacitor, and why?
Yes, the LT1766EGN#TRPBF requires an external BOOST capacitor (and catch diode) connected between BOOST and SW pins. This network generates a voltage higher than VIN to fully saturate the internal NPN power switch, reducing its effective on-resistance to 0.2Ω and minimizing conduction losses-critical for high-efficiency operation at high input voltages.
What is the function of the VC pin on the LT1766EGN#TRPBF?
The VC pin on the LT1766EGN#TRPBF is the output of the internal error amplifier and serves as the current-limit threshold input for the peak-current comparator. It typically ranges from 0.9V (light load) to 2.1V (full load), and can be externally driven to ground to force shutdown. It is also used for frequency compensation network connection.
How does the LT1766EGN#TRPBF handle short-circuit protection?
The LT1766EGN#TRPBF implements dual-foldback protection: when FB voltage drops below 0.8V, switching frequency reduces ~5:1; below 0.6V, peak switch current is clamped to <1A. This limits power dissipation in the IC, external diode, and inductor during sustained short-circuit events-without requiring external current-sense resistors or protection ICs.
Can the LT1766EGN#TRPBF be synchronized to an external clock, and what is its sync range?
Yes, the LT1766EGN#TRPBF supports external synchronization via the SYNC pin, accepting logic-level square waves with 10–90% duty cycle. Its synchronization range spans 228kHz to 700kHz-enabling EMI mitigation in multi-rail systems and deterministic noise alignment in sensitive measurement equipment using the LT1766EGN#TRPBF.
LT1766EGN#TRPBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 16-SSOP (0.154", 3.90mm Width)
- 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-SSOP
LT1766EGN#TRPBF FAQ
1.How can I place an order for LT1766EGN#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT1766EGN#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 LT1766EGN#TRPBF reliable?
The price and inventory of LT1766EGN#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT1766EGN#TRPBF is usually 5 days.
3.What payment methods are accepted for LT1766EGN#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT1766EGN#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT1766EGN#TRPBF?
LT1766EGN#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT1766EGN#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 LT1766EGN#TRPBF?
For technical support, including LT1766EGN#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT1766EGN#TRPBF requirements.
6.How does Aetrix verify that LT1766EGN#TRPBF is sourced from the original manufacturer or authorized distributors?
All LT1766EGN#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 LT1766EGN#TRPBF meets industry standards.
7.What is the process for return or replacement of LT1766EGN#TRPBF?
All LT1766EGN#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LT1766EGN#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 LT1766EGN#TRPBF part is unused and in its original packaging.
Return procedure for LT1766EGN#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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