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Analog Devices Inc. LT1766EFE#PBF
- Part No.:
- LT1766EFE#PBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 16-TSSOP (0.173", 4.40mm Width) Exposed Pad
- Datasheet:
-
LT1766EFE#PBF.pdf
- Description:
- IC REG BUCK ADJ 1.5A 16TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:170
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Product details
Overview
LT1766EFE#PBF 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 1.22V feedback reference. 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#PBF datasheet, LT1766EFE#PBF pinout, LT1766EFE#PBF application, or LT1766EFE#PBF equivalent, key selection criteria include its fixed 200kHz switching frequency, cycle-by-cycle current limiting, thermally enhanced TSSOP-16 package with exposed GND pad, and compatibility with external synchronization from 228kHz to 700kHz.
Technical Context
The LT1766EFE#PBF employs current-mode control architecture with an internal 200kHz oscillator, error amplifier (gm = 2000 μ℧), and peak-current comparator referenced to the VC pin. Its patented circuitry maintains constant 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-driven saturation scheme to reduce switch voltage drop-achieving 0.2Ω on-resistance at 1.5A-and draws only 2.5mA quiescent supply current. Shutdown reduces current to 25μA, and the SHDN pin provides dual-threshold UVLO (2.38V) and micropower shutdown (0.4V).
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 rails without pre-regulation. |
| Switch Current Limit | 1.5A (min) - enables continuous 1A output with margin for transient surges and thermal derating in TSSOP package. |
| Switching Frequency | 200kHz (typ) - balances EMI performance, inductor size, and efficiency; externally synchronizable from 228kHz to 700kHz. |
| Feedback Reference | 1.219V (typ) - precise voltage setting point for adjustable-output designs using external resistor divider. |
| Quiescent Supply Current | 2.5mA (typ) - low operating current enables efficient light-load performance in battery-powered systems. |
| Shutdown Current | 25μA (max) - ultra-low standby draw suitable for always-on subsystems with wake-on-event capability. |
| Package Thermal Resistance | θJA = 45°C/W (TSSOP-16 w/ exposed pad) - requires PCB copper pour under exposed pad (Pin 17) for reliable 125°C junction operation. |
Pinout & Package
The LT1766EFE#PBF is housed in a 16-lead plastic TSSOP package with exposed backside thermal pad (Pin 17 = GND), optimized for high-power density and thermal dissipation in space-constrained industrial layouts.
| 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 large PCB copper plane to minimize thermal resistance and ensure load regulation stability. |
| SW (Pin 2) | Emitter of internal NPN power switch | Drives external inductor; swings from near-GND to VIN during switching; requires catch diode clamping to limit negative swing to –0.8V. |
| VIN (Pin 4) | Collector of internal NPN switch & primary supply | Accepts up to 60V; carries high dI/dt; must be decoupled locally with low-ESR capacitor to suppress switching spikes. |
| BOOST (Pin 6) | Bootstrap drive voltage source | Connected via external capacitor/diode to VIN+5V; enables switch saturation and 0.2Ω RON, critical for high-efficiency operation above 12V input. |
| BIAS (Pin 10) | Secondary bias supply input | Connect to VOUT ≥3V to divert internal bias current from VIN, improving efficiency at high VIN/light loads. |
| VC (Pin 11) | Error amplifier output / current limit setpoint | Used for loop compensation; also serves as current clamp node (0.9V–2.1V range); can be driven to GND to disable switching. |
| FB (Pin 12) | Feedback input / voltage sense node | Receives 1.219V reference; sets output via resistor divider; triggers frequency foldback (<0.8V) and current limit reduction (<0.6V) during fault conditions. |
| 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 UVLO | 2.38V threshold enables undervoltage lockout; 0.4V threshold forces full micropower shutdown; open-circuit defaults to enabled state. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated 1.5A NPN switch | Eliminates external MOSFET and gate driver; reduces BOM count and layout complexity while maintaining 0.2Ω effective RON via BOOST-assisted saturation. |
| Current-mode control | Delivers inherent cycle-by-cycle current limiting and superior transient response vs. voltage-mode controllers-no external slope compensation required. |
| Wide-input 5.5V–60V operation | Supports direct integration into 24V/36V/48V industrial, transportation, and telecom power architectures without front-end buck or LDO pre-regulation. |
| Thermally enhanced TSSOP-16 | Exposed GND pad (Pin 17) lowers θJA to 45°C/W-enables 1A continuous output at +85°C ambient with minimal copper area. |
| Dual-threshold SHDN pin | Provides both precision UVLO (2.38V) for system sequencing and deep shutdown (0.4V) for <25μA standby, simplifying power management logic. |
Applications
| Industrial Power Supply | Battery Charger Control |
|---|---|
Use Scenario: Regulating unregulated 24V–48V rail to 5V/3.3V for PLC I/O modules, sensors, and fieldbus interfaces in factory automation cabinets. IC Role / Device Role / Timing Role: Primary non-isolated buck converter delivering stable, ripple-controlled output with built-in overcurrent protection and thermal robustness. Use Value: Eliminates need for discrete high-voltage MOSFET and controller IC; maintains >85% efficiency across 0.1–1A load range at 42V input. | Use Scenario: Charging 12V sealed lead-acid or LiFePO₄ batteries from variable solar or vehicle alternator sources (15–60V). IC Role / Device Role / Timing Role: Constant-current/constant-voltage stage controller with programmable feedback and foldback protection during short-circuit or cell imbalance events. Use Value: Built-in frequency and current foldback (<0.8V FB) limits power dissipation in IC and external diode during battery short or deep discharge recovery. |
| Automotive Subsystem Power | Distributed Telecom Power |
Use Scenario: Powering infotainment displays, camera modules, or ADAS ECUs from 12V battery with cold-crank (5.5V) and load-dump (60V) tolerance. IC Role / Device Role / Timing Role: High-reliability buck regulator meeting AEC-Q200 stress requirements when used with automotive-grade passives and layout. Use Value: Guaranteed operation from –40°C to +125°C junction; 60V absolute max rating withstands ISO 7637-2 pulse 5a (load dump) without external TVS. | Use Scenario: Point-of-load conversion in 48V intermediate bus architecture for remote radio units or optical line cards. IC Role / Device Role / Timing Role: Synchronized buck stage in multi-phase or multi-rail systems to suppress conducted EMI and avoid heterodyne noise. Use Value: SYNC pin accepts 228–700kHz external clock-enables deterministic switching alignment with other regulators and baseband clocks. |
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-capable, requires external BOOT capacitor; no integrated BOOST diode path. | Better suited for compact 5V/12V input systems where higher frequency allows smaller magnetics; lacks 60V tolerance and BOOST-assisted saturation. | Select LTC3642EMSE#PBF when input ≤40V and board space is constrained; avoid for 48V industrial or automotive battery inputs. |
| MP2451DT-LF-Z | 36V max input, 0.6A switch, 2MHz fixed frequency, no SYNC or BOOST pin; lower cost but limited current and voltage range. | Targeted at consumer-grade 5V/12V USB or IoT power rails; lacks UVLO thresholds, thermal enhancement, and fault foldback features. | Choose MP2451DT-LF-Z for cost-sensitive, low-power applications below 0.6A; not viable for LT1766EFE#PBF's 1.5A/60V use cases. |
Compared with LTC3642EMSE#PBF and MP2451DT-LF-Z, the LT1766EFE#PBF uniquely combines 60V input tolerance, integrated BOOST drive, and dual-threshold shutdown-making it irreplaceable in high-voltage industrial and automotive power designs requiring robust fault handling and thermal performance.
Availability
LT1766EFE#PBF is available at Aetrix Electronics and suitable for industrial power supplies, battery charging systems, and automotive subsystems requiring stable component supply, long-term lifecycle support, and guaranteed RoHS-compliant lead-free packaging.
Supply support for LT1766EFE#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 power management semiconductors, formed through the acquisition of Linear Technology in 2017.
The LT1766EFE#PBF belongs to ADI's legacy Linear Technology high-voltage monolithic regulator family, engineered specifically for rugged industrial, transportation, and telecom applications demanding wide input range, integrated power switch reliability, and thermal resilience.
FAQ
What is the maximum continuous output current achievable with the LT1766EFE#PBF in a standard 4-layer PCB layout?
The LT1766EFE#PBF supports up to 1A continuous output current at +85°C ambient when mounted on a 4-layer PCB with ≥2 in² of 2-oz copper connected to the exposed GND pad (Pin 17). This assumes proper BOOST capacitor sizing (≥100nF ceramic), 47μH shielded inductor, and 100μF solid tantalum output capacitor. Derating to 0.8A is recommended for operation up to +105°C ambient.
Does the LT1766EFE#PBF require an external BOOST diode, and what type is recommended?
Yes, the LT1766EFE#PBF requires an external BOOST diode connected between VIN and the BOOST pin (Pin 6). A Schottky diode with ≤0.5V forward voltage and ≥100mA average current rating is recommended-such as the 1N5817 or MBR0520L. The diode must be placed within 2mm of the IC with minimal trace inductance to ensure reliable switch saturation at full load.
Can the LT1766EFE#PBF be synchronized to an external clock, and what are the valid frequency and amplitude ranges?
Yes, the LT1766EFE#PBF supports external synchronization via the SYNC pin (Pin 14). Valid input frequency range is 228kHz to 700kHz with 10–90% duty cycle. Minimum logic-high amplitude is 1.5V (typical 2.2V), and input resistance is 20kΩ. Synchronization overrides the internal 200kHz oscillator and maintains stable operation across temperature and input voltage variations.
How does the LT1766EFE#PBF handle short-circuit conditions on the output?
The LT1766EFE#PBF implements dual-stage short-circuit protection: when FB voltage drops below 0.8V, switching frequency folds back ~5:1 (to ~40kHz); below 0.6V, peak switch current limit reduces from 1.5A to <1A. This foldback behavior-combined with 25μA shutdown current-limits power dissipation in the IC, external diode, and inductor during sustained faults without requiring external circuitry.
Is the LT1766EFE#PBF pin-compatible with the LT1766EFE-5#PBF, and what is the key functional difference?
No, the LT1766EFE#PBF and LT1766EFE-5#PBF are not pin-compatible replacements. While both share identical pinout and package, the LT1766EFE#PBF uses an adjustable feedback reference (1.219V) requiring external resistor divider, whereas the LT1766EFE-5#PBF has internal 5V feedback divider and repurposes the FB pin as a SENSE input tied directly to VOUT. Circuit redesign is required to swap between them.
LT1766EFE#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:
- 0°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 16-TSSOP-EP
LT1766EFE#PBF FAQ
1.How can I place an order for LT1766EFE#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT1766EFE#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 LT1766EFE#PBF reliable?
The price and inventory of LT1766EFE#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT1766EFE#PBF is usually 5 days.
3.What payment methods are accepted for LT1766EFE#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT1766EFE#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT1766EFE#PBF?
LT1766EFE#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT1766EFE#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 LT1766EFE#PBF?
For technical support, including LT1766EFE#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT1766EFE#PBF requirements.
6.How does Aetrix verify that LT1766EFE#PBF is sourced from the original manufacturer or authorized distributors?
All LT1766EFE#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 LT1766EFE#PBF meets industry standards.
7.What is the process for return or replacement of LT1766EFE#PBF?
All LT1766EFE#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LT1766EFE#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 LT1766EFE#PBF part is unused and in its original packaging.
Return procedure for LT1766EFE#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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