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Analog Devices Inc. LT1766IGN#PBF
- Part No.:
- LT1766IGN#PBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 16-SSOP (0.154", 3.90mm Width)
- Datasheet:
-
LT1766IGN#PBF.pdf
- Description:
- IC REG BUCK ADJ 1.5A 16SSOP
- Quantity:
- Payment:
- Shipping:
Inventory:443
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Product details
Overview
LT1766IGN#PBF 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 where high-voltage tolerance and cycle-by-cycle current limiting are required.
For engineers reviewing the LT1766IGN#PBF datasheet, LT1766IGN#PBF pinout, LT1766IGN#PBF application, or LT1766IGN#PBF equivalent, key selection criteria include its wide-input buck topology, thermally enhanced SSOP-16 package with exposed GND pad, constant-frequency current-mode control, and shutdown current of 25μA - all critical for automotive and battery-powered system designs.
Technical Context
The LT1766IGN#PBF implements current-mode control with an internal 200kHz oscillator, error amplifier (gm = 2000 μmho), and peak-current comparator referenced to the VC pin. Its patented circuitry maintains 1.5A peak switch current across the full duty cycle range (up to 96%), enabling stable operation under wide VIN/VOUT ratios.
It uses a BOOST pin-driven saturating NPN switch architecture, requiring an external boost capacitor and diode to achieve low 0.2Ω on-resistance. The BIAS pin allows output-derived biasing to improve efficiency at high input voltages, while SHDN provides dual-threshold (0.4V/2.38V) shutdown and undervoltage lockout functionality.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 5.5V to 60V - supports direct connection to 24V/48V industrial rails and automotive batteries without pre-regulation. |
| Switch Current Limit | 1.5A peak - sets maximum inductor and external diode current handling capability in continuous conduction mode. |
| Switching Frequency | 200kHz fixed - enables predictable EMI filtering and compact magnetics design with minimal frequency variation (±16kHz over temp). |
| Feedback Reference | 1.22V (LT1766 variant) - defines output voltage via external resistor divider; enables precise adjustment from 3V to 15V. |
| Shutdown Current | 25μA - ensures ultra-low quiescent draw during system sleep, critical for battery longevity in portable equipment. |
| Thermal Package | 16-pin SSOP with exposed GND pad - achieves θJC = 25°C/W (pin 8), enabling >1A continuous output at 85°C ambient with minimal PCB copper. |
| Operating Junction Temp | –40°C to 125°C - qualified for extended-temperature industrial and automotive under-hood applications. |
Pinout & Package
LT1766IGN#PBF is housed in a 16-lead plastic SSOP package (GN grade) with four corner pins and pin 17 (exposed pad) internally connected to GND. The package requires soldering the exposed pad to a PCB ground plane for thermal and electrical integrity.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| GND (Pins 1, 8, 9, 16) | Power and signal reference ground | Must be tied directly to load ground plane; multiple pins reduce ground impedance and improve load regulation. |
| SW (Pin 2) | Emitter of internal NPN power switch | Drives inductor; swings from ~–0.8V (off) to VIN (on); requires catch diode and low-inductance layout. |
| VIN (Pin 4) | Collector of internal NPN switch + bias source | Primary power input; high dI/dt node - demands short, wide trace to input capacitor and SW. |
| BOOST (Pin 6) | Boost capacitor drive node | Supplies >VIN voltage to saturate NPN switch; requires external 100V ceramic cap and fast diode (e.g., 1N4148W). |
| BIAS (Pin 10) | External bias supply input | Connect to VOUT ≥3V to shift internal bias current from VIN, improving efficiency at high VIN/light loads. |
| VC (Pin 11) | Error amplifier output / current limit setpoint | Compensation node; also serves as current clamp - driving it to GND disables switching. |
| FB (Pin 12) | Feedback input (1.22V reference) | Resistor divider connects here to set output voltage; below 0.6V triggers foldback current limit and SYNC disable. |
| SYNC (Pin 14) | External clock synchronization input | Accepts logic-level 228kHz–700kHz signal; enables noise-sensitive multi-rail systems to avoid beat frequencies. |
| SHDN (Pin 15) | Enable/shutdown control | 2.38V UVLO threshold prevents startup until VIN is valid; 0.4V forces micropower shutdown (25μA). |
Key Features
| Feature | Design Value |
|---|---|
| Integrated 1.5A NPN switch with 0.2Ω RON | Eliminates need for external MOSFET and gate driver; reduces BOM count and layout complexity in space-constrained designs. |
| Current-mode control architecture | Delivers fast transient response and inherent cycle-by-cycle overcurrent protection without additional sensing components. |
| Dual-threshold SHDN pin | Enables both precise undervoltage lockout (2.38V) and deep-sleep shutdown (0.4V), supporting robust power sequencing in multi-voltage systems. |
| Frequency and current foldback below 0.8V FB | Reduces power dissipation during short-circuit faults by lowering fSW and ILIM, protecting IC, diode, and inductor without external fault circuitry. |
| BOOST pin with external capacitor/diode | Allows NPN saturation at high VIN, achieving FET-like conduction loss (0.2Ω) with smaller die area and lower cost than comparable MOSFET-based regulators. |
Applications
| Industrial Power Supply | Automotive Body Control Module |
|---|---|
Use Scenario: Regulating 48V truck battery down to 5V for microcontroller and CAN transceiver rails. IC Role / Device Role / Timing Role: Primary buck converter delivering 1A continuous output with input transient immunity up to 60V. Use Value: Wide 5.5V–60V input range handles cold-crank (≈6V) and load-dump (≈60V) events without external protection; 125°C rating ensures reliability under hood. | Use Scenario: Powering infotainment head-unit logic from 12V battery with strict quiescent current limits. IC Role / Device Role / Timing Role: Standby-mode DC/DC converter maintaining 3.3V rail during vehicle sleep state. Use Value: 25μA shutdown current meets ISO 16750-2 parasitic drain requirements; SSOP package fits tight PCB real estate near connectors. |
| Portable Test Equipment | Industrial IoT Sensor Node |
Use Scenario: Converting 24V field bus power to 5V for FPGA and ADC subsystems in handheld analyzers. IC Role / Device Role / Timing Role: High-efficiency intermediate regulator enabling battery operation with extended runtime. Use Value: BIAS pin operation improves efficiency at 24V→5V conversion (vs. VIN-biased mode); 200kHz fSW allows small 47μH inductor and low-profile capacitors. | Use Scenario: Powering LoRaWAN edge node with intermittent 12V solar/battery input and 3.3V MCU/radio rail. IC Role / Device Role / Timing Role: Input-tolerant buck controller managing variable input while maintaining stable 3.3V output. Use Value: 1.22V feedback reference enables accurate 3.3V setting with standard 1% resistors; SYNC input allows coordination with radio transmit timing to minimize EMI. |
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 fSW, integrated MOSFET, no BOOST pin required | Better suited for compact, high-efficiency 12V/24V systems; lacks 60V tolerance and dual-threshold SHDN | Select when higher switching frequency and simpler layout outweigh need for 60V operation and UVLO precision. |
| LM5164QDGSRQ1 | 65V max input, 1A switch, 1MHz fSW, integrated MOSFET, automotive AEC-Q100 Grade 1 | Qualified for automotive but rated only 1A; lacks frequency foldback and has higher shutdown current (75μA) | Select for new automotive designs requiring AEC-Q100 qualification and higher fSW, accepting reduced fault protection and current capability. |
Compared with LTC3642EMSE#PBF and LM5164QDGSRQ1, LT1766IGN#PBF uniquely combines 60V input tolerance, 1.5A current capability, dual-threshold shutdown, and frequency foldback in a thermally optimized SSOP package - making it optimal for ruggedized industrial and legacy automotive applications where fault resilience and wide VIN range are non-negotiable.
Availability
LT1766IGN#PBF is available at Aetrix Electronics and suitable for industrial power supplies, automotive body control modules, and portable test equipment requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for LT1766IGN#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. (acquired Linear Technology in 2017) is a global leader in high-performance analog, mixed-signal, and power management semiconductors.
The LT1766 series belongs to Linear Technology's monolithic DC/DC converter product line, designed specifically for high-input-voltage industrial and automotive applications demanding robustness, wide operating temperature range, and integrated protection features.
FAQ
What is the maximum input voltage rating for LT1766IGN#PBF?
The absolute maximum input voltage (VIN) for LT1766IGN#PBF is 60V, with guaranteed operation from 5.5V to 60V. This rating enables direct interface with 48V industrial buses and automotive systems experiencing load-dump transients. Exceeding 60V risks permanent damage per Absolute Maximum Ratings. The device maintains 1.5A peak switch current and stable 200kHz operation across this full range when used with proper BOOST capacitor and thermal design.
Does LT1766IGN#PBF have a fixed or adjustable output voltage?
LT1766IGN#PBF features an adjustable output voltage using its 1.22V feedback reference (VREF). Unlike the LT1766-5 variant with internal 5V divider, LT1766IGN#PBF requires an external resistor divider connected to the FB pin to set the desired output (e.g., 3.3V, 5V, or 12V). The datasheet provides standard 1% resistor values for common outputs and specifies ≤5kΩ recommended R2 value to ensure accuracy within 0.25% error.
How does the BOOST pin function in LT1766IGN#PBF?
The BOOST pin in LT1766IGN#PBF drives an external capacitor-diode network to generate a voltage ~5V above VIN, which is applied to the base of the internal NPN power switch. This ensures saturation and achieves a low effective on-resistance of 0.2Ω - comparable to a discrete MOSFET - while minimizing die size and cost. A typical implementation uses a 100V ceramic capacitor and fast-switching diode (e.g., 1N4148W) connected between BOOST and SW pins.
What thermal considerations apply to LT1766IGN#PBF in SSOP package?
LT1766IGN#PBF in the 16-pin SSOP (GN) package has θJA = 85°C/W and θJC = 25°C/W (measured at pin 8). To maintain safe junction temperature, the exposed GND pad (pin 17) must be soldered to a large PCB copper plane. With 1A load at 48V→5V, thermal simulation shows ~85°C junction rise above ambient - well within the –40°C to 125°C operating range. Layout guidelines emphasize short, wide traces for VIN, SW, and GND paths to minimize inductive spikes and ground bounce.
Can LT1766IGN#PBF be synchronized to an external clock?
Yes, LT1766IGN#PBF supports external synchronization via the SYNC pin (pin 14), accepting logic-level signals from 228kHz to 700kHz with 10%–90% duty cycle. This feature allows noise-sensitive systems (e.g., data acquisition or RF modules) to align switching edges and avoid beat frequencies. During fault conditions (FB < 0.6V), SYNC is automatically disabled to preserve foldback protection integrity - a behavior confirmed in the Applications Information section.
LT1766IGN#PBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 16-SSOP (0.154", 3.90mm Width)
- 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-SSOP
LT1766IGN#PBF FAQ
1.How can I place an order for LT1766IGN#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT1766IGN#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 LT1766IGN#PBF reliable?
The price and inventory of LT1766IGN#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT1766IGN#PBF is usually 5 days.
3.What payment methods are accepted for LT1766IGN#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT1766IGN#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT1766IGN#PBF?
LT1766IGN#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT1766IGN#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 LT1766IGN#PBF?
For technical support, including LT1766IGN#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT1766IGN#PBF requirements.
6.How does Aetrix verify that LT1766IGN#PBF is sourced from the original manufacturer or authorized distributors?
All LT1766IGN#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 LT1766IGN#PBF meets industry standards.
7.What is the process for return or replacement of LT1766IGN#PBF?
All LT1766IGN#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LT1766IGN#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 LT1766IGN#PBF part is unused and in its original packaging.
Return procedure for LT1766IGN#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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