My Inquiry
My Account
Analog Devices Inc. LT1766EGN#PBF
- Part No.:
- LT1766EGN#PBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 16-SSOP (0.154", 3.90mm Width)
- Datasheet:
-
LT1766EGN#PBF.pdf
- Description:
- IC REG BUCK ADJ 1.5A 16SSOP
- Quantity:
- Payment:
- Shipping:
Inventory:7,633
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
LT1766EGN#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 requiring high-voltage tolerance and fast transient response.
For engineers reviewing the LT1766EGN#PBF datasheet, LT1766EGN#PBF pinout, LT1766EGN#PBF application, or LT1766EGN#PBF equivalent, key selection factors include its constant-frequency current-mode control, BOOST-pin-assisted saturation, 25μA shutdown current, and compatibility with external synchronization from 228kHz to 700kHz.
Technical Context
The LT1766EGN#PBF implements current-mode control with cycle-by-cycle peak current limiting and a dedicated error amplifier (gm = 2000 μ℧, gain = 400 V/V) referenced to a 1.219V internal bandgap. Its oscillator operates at a fixed 200kHz nominal frequency, with line regulation of 0.05%/V and frequency foldback below 0.8V FB voltage for short-circuit protection.
It uses a BOOST capacitor to drive the internal NPN switch into saturation, reducing conduction loss to ~0.2Ω at 1.5A. The BIAS pin enables output-derived biasing to improve efficiency at high VIN/VOUT ratios, while SHDN provides dual-threshold (0.4V/2.38V) shutdown and UVLO functionality.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 5.5V to 60V - supports wide-range industrial, automotive, and battery-fed systems without pre-regulation. |
| Switch Current Limit | 1.5A peak - sustains full rated load across full duty cycle range, enabling robust 5V@1A operation with margin. |
| Switch On-Resistance | 0.2Ω typical - achieved via BOOST pin drive, minimizing conduction loss and thermal stress at 1.5A. |
| Feedback Reference | 1.219V ±1.5% - precise, temperature-stable reference for accurate output voltage setting via external resistor divider. |
| Shutdown Current | 25μA max - enables ultra-low-power standby in battery-powered or energy-sensitive applications. |
| Sync Frequency Range | 228kHz to 700kHz - allows EMI reduction and system-level clock alignment without modifying internal oscillator. |
| Operating Junction Temp | –40°C to 125°C - qualified for extended industrial environments with built-in overtemperature protection. |
Pinout & Package
The LT1766EGN#PBF is housed in a 16-lead plastic SSOP package (GN) with exposed ground pad (Pin 17), offering θJA = 85°C/W and θJC = 25°C/W (Pin 8). Ground pins (1, 8, 9, 16) must be soldered to PCB ground plane for optimal thermal and load regulation performance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| GND (1, 8, 9, 16) | Power and signal reference ground | Multiple low-inductance return paths required; connects to PCB ground plane for thermal dissipation and load regulation stability. |
| SW (2) | Emitter of internal NPN power switch | Drives inductor; swings from –0.8V (clamped) to VIN during operation; requires low-inductance catch diode path. |
| VIN (4) | Collector of internal NPN switch & primary supply | High dI/dt node; must be decoupled locally with low-ESR capacitor to minimize switching spikes. |
| BOOST (6) | Boost capacitor connection | Provides >VIN gate drive to saturate internal switch; enables 0.2Ω RON and high efficiency at high VIN. |
| BIAS (10) | External bias supply input | Connects to regulated output (≥3V) to reduce input supply current and improve efficiency at high VIN/VOUT ratios. |
| VC (11) | Error amplifier output / current limit comparator input | Used for loop compensation; clamps between 0.9V (light load) and 2.1V (full load); can override regulation or force shutdown. |
| FB (12) | Feedback input / reference comparator | Accepts 1.219V reference; sets output voltage via resistor divider; enables foldback protection below 0.8V (freq) and 0.6V (current). |
| SYNC (14) | External oscillator synchronization input | Logic-compatible (1.5V–2.2V min), accepts 228–700kHz signals with 10–90% duty cycle for EMI control. |
| SHDN (15) | Shutdown control with UVLO | 2.38V threshold disables switching (UVLO); 0.4V threshold forces micropower shutdown (25μA IQ). |
Key Features
| Feature | Design Value |
|---|---|
| Current-mode control architecture | Delivers fast transient response and stable loop compensation without complex type-II/type-III networks. |
| Patented peak switch current maintenance | Ensures consistent 1.5A current limit across full duty cycle range, eliminating derating at low VOUT/VIN. |
| BOOST-pin-assisted saturation | Reduces effective switch RON to 0.2Ω, enabling high efficiency (>90% at 12V→5V/1A) without discrete MOSFETs. |
| Dual-threshold SHDN pin | Provides both precise undervoltage lockout (2.38V) and deep micropower shutdown (0.4V), simplifying power sequencing. |
| Frequency and current foldback | Automatically reduces switching frequency and peak current when FB < 0.8V or < 0.6V, limiting power dissipation during short-circuit faults. |
Applications
| Industrial Power Supply | Automotive Body Control Module |
|---|---|
Use Scenario: 24V truck battery powers 5V microcontroller, CAN transceiver, and sensors in under-hood environment. IC Role / Device Role / Timing Role: Primary 24V→5V buck regulator delivering 1A with input surge tolerance up to 60V and thermal resilience to 125°C junction. Use Value: Eliminates need for external TVS + pre-regulator; maintains regulation during cold-crank (6.5V min) and load-dump (60V transients). | Use Scenario: 12V/24V vehicle battery supplies 5V rail for door module MCU, window motor driver, and LED lighting. IC Role / Device Role / Timing Role: High-input-voltage buck converter with UVLO and shutdown control synchronized to vehicle wake-up signals. Use Value: Dual SHDN thresholds enable controlled power-down during sleep mode (25μA IQ) and prevent startup until battery reaches safe voltage. |
| Portable Test Equipment | Distributed Telecom Power |
Use Scenario: Li-ion battery pack (8–32V) powers handheld oscilloscope with FPGA, ADC, and display backlight. IC Role / Device Role / Timing Role: Adjustable-output buck regulator configured for 3.3V/1A with BIAS pin connected to 3.3V rail to maximize light-load efficiency. Use Value: BIAS-driven biasing reduces total input current by ~40% vs. VIN-only operation, extending battery runtime. | Use Scenario: 48V telecom backplane supplies isolated 5V rails to multiple plug-in cards via local point-of-load conversion. IC Role / Device Role / Timing Role: Non-isolated 48V→5V buck stage with SYNC input tied to system clock to suppress conducted EMI in shared power bus. Use Value: Synchronization to 500kHz system clock avoids beat frequencies and eases compliance with EN 55022 Class B emissions limits. |
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 | 42V max input, 1.2A switch, 3mm × 4mm MSOP, no BOOST pin, lower quiescent current (12μA) | Better suited for space-constrained, lower-current (<1.2A), lower-input-voltage (≤42V) designs | Select if board area is critical and input never exceeds 42V; avoid if 60V transients or 1.5A peak load required. |
| LM5164QPWPRQ1 | 65V max input, 1A switch, integrated high-side FET, 2.1MHz switching, no external BOOST needed | Higher frequency enables smaller magnetics but higher switching loss; lacks current foldback protection | Select for compact 65V designs needing high fSW; verify short-circuit thermal performance without foldback. |
Compared with LTC3631EMSE#PBF and LM5164QPWPRQ1, the LT1766EGN#PBF uniquely combines 60V input rating, 1.5A switch, BOOST-assisted saturation, and analog foldback protection-making it optimal for ruggedized 5–60V industrial buck applications where fault robustness and thermal margin are prioritized over footprint or ultra-low IQ.
Availability
LT1766EGN#PBF is available at Aetrix Electronics and suitable for industrial power supplies, automotive body control modules, portable test equipment, and distributed telecom power systems requiring stable component supply across extended temperature and voltage ranges.
Supply support for LT1766EGN#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 LT1766EGN#PBF belongs to Linear's legacy high-voltage monolithic buck regulator family, designed specifically for industrial, automotive, and telecom applications demanding wide input range, integrated power switch robustness, and analog fault protection without digital complexity.
FAQ
What is the maximum input voltage rating for the LT1766EGN#PBF?
The LT1766EGN#PBF has an absolute maximum input voltage rating of 60V on the VIN pin. It is specified to operate continuously from 5.5V to 60V, making it suitable for 24V and 48V industrial systems with transient overvoltage tolerance. Operation above 60V risks permanent damage per Absolute Maximum Ratings.
Does the LT1766EGN#PBF require an external BOOST capacitor, and why?
Yes, the LT1766EGN#PBF requires an external BOOST capacitor (typically 10nF–100nF ceramic) connected between BOOST and SW pins. This capacitor generates a voltage higher than VIN to fully saturate the internal NPN power switch, achieving the specified 0.2Ω on-resistance and minimizing conduction losses-critical for high-efficiency operation at high input voltages.
Can the LT1766EGN#PBF be used with a fixed 5V output without external resistors?
No-the LT1766EGN#PBF is the adjustable version with a 1.219V feedback reference and requires an external resistor divider on the FB pin to set output voltage. For fixed 5V output, use the LT1766EGN-5#PBF variant, which integrates the feedback divider and renames FB as SENSE, connecting directly to the 5V output.
How does the SHDN pin function on the LT1766EGN#PBF?
The SHDN pin on the LT1766EGN#PBF provides dual-function control: at ≥2.38V it enables normal operation; at ≤0.4V it forces micropower shutdown (25μA supply current); and between these thresholds, it acts as a precise undervoltage lockout (UVLO) to prevent startup until input voltage reaches a safe level-ensuring reliable power sequencing.
What thermal considerations apply to the LT1766EGN#PBF in SSOP package?
The LT1766EGN#PBF in 16-lead SSOP (GN) has θJA = 85°C/W. To maintain ≤125°C junction temperature at full load, the PCB must provide adequate copper area connected to all GND pins (1, 8, 9, 16) and especially the exposed pad (Pin 17, internally GND). Thermal vias to inner ground planes are strongly recommended to achieve acceptable power dissipation.
LT1766EGN#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:
- 0°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 16-SSOP
LT1766EGN#PBF FAQ
1.How can I place an order for LT1766EGN#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT1766EGN#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 LT1766EGN#PBF reliable?
The price and inventory of LT1766EGN#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT1766EGN#PBF is usually 5 days.
3.What payment methods are accepted for LT1766EGN#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT1766EGN#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT1766EGN#PBF?
LT1766EGN#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT1766EGN#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 LT1766EGN#PBF?
For technical support, including LT1766EGN#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT1766EGN#PBF requirements.
6.How does Aetrix verify that LT1766EGN#PBF is sourced from the original manufacturer or authorized distributors?
All LT1766EGN#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 LT1766EGN#PBF meets industry standards.
7.What is the process for return or replacement of LT1766EGN#PBF?
All LT1766EGN#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LT1766EGN#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 LT1766EGN#PBF part is unused and in its original packaging.
Return procedure for LT1766EGN#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
LT1766EGN#PBF Tags
-
TPS562201DDCR
Texas Instruments
-
MC34063ABD-TR
STMicroelectronics
-
TPS561201DDCR
Texas Instruments
-
MC33063ADR
Texas Instruments
-
MC34063ADR
Texas Instruments
-
TPS560200DBVR
Texas Instruments
-
AP3012KTR-G1
Diodes Incorporated
-
TLV61048DBVR
Texas Instruments
-
AZ34063UMTR-G1
Diodes Incorporated
-
TPS562200DDCR
Texas Instruments
-
AP62300TWU-7
Diodes Incorporated
-
MC34063EBD-TR
STMicroelectronics
Tech Hub
A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.
The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…
The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…
A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…
A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …
An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…
Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…
An engineering guide to LED driver operation, constant-current and constant-voltage outputs, linear and switching topologies, dimming, IC selection, calculations, replacement compatibility, and fault c…
Operational amplifier guide covering op amp basics, feedback, ideal vs real op amps, common configurations, buffer circuits, offset, bias current, gain-bandwidth, slew rate, rail-to-rail limits and sel…
Jumper cables guide covering safe connection order, red and black clamp placement, final ground connection, cable gauge, length, clamp quality, copper vs CCA cables, jump starter comparison and battery…
