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Analog Devices Inc. LT1765EFE-1.8#PBF
- Part No.:
- LT1765EFE-1.8#PBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 16-TSSOP (0.173", 4.40mm Width) Exposed Pad
- Datasheet:
-
LT1765EFE-1.8#PBF.pdf
- Description:
- IC REG BUCK 1.8V 3A 16TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:4,772
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Product details
Overview
LT1765EFE-1.8#PBF from Analog Devices (formerly Linear Technology) is a monolithic 3A, 1.25MHz current-mode step-down switching regulator with fixed 1.8V output, integrated 0.09Ω NPN power switch, and thermally enhanced 16-lead TSSOP package. It operates from 3V to 25V input, delivers up to 3A continuous output, and maintains constant maximum switch current across all duty cycles - ideal for compact, high-efficiency point-of-load conversion in portable computing and battery-powered systems.
For engineers reviewing the LT1765EFE-1.8#PBF datasheet, LT1765EFE-1.8#PBF pinout, LT1765EFE-1.8#PBF application, or LT1765EFE-1.8#PBF equivalent, this device offers confirmed 1.8V ±1.8% feedback reference accuracy, 15μA shutdown current, 1.25MHz switching frequency with external synchronization up to 2MHz, and full cycle-by-cycle current limiting - critical for stable operation under transient load and short-circuit conditions.
Technical Context
The LT1765EFE-1.8#PBF implements a constant-frequency, current-mode buck architecture with an internal 1.25MHz oscillator, peak-current sensing via on-die resistor, and error amplifier output (VC pin) directly controlling switch current threshold. Its bipolar NPN switch uses BOOST pin voltage (≥VIN + 1.8V) to ensure saturation, enabling high efficiency at high switching frequencies.
It features built-in thermal shutdown, undervoltage lockout (2.6V nominal), and logic-compatible SYNC input for frequency alignment between 1.6MHz–2MHz. The FB pin is internally connected to the 1.8V output - no external divider required - and the VC pin supports both compensation and current-clamp functionality with 0.4V–0.9V operating range.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 1.8V ±1.8% (1.764V–1.836V) - eliminates external resistor network, reduces BOM count and layout sensitivity. |
| Max Output Current | 3A continuous - supported by on-die 0.09Ω NPN switch and thermal design of 16-lead TSSOP with exposed pad (θJC = 10°C/W). |
| Switching Frequency | 1.25MHz typical (1.1–1.6MHz over temp) - enables use of sub-3μH chip inductors and <5μF ceramic input/output capacitors. |
| Input Voltage Range | 3V to 25V - accommodates single-cell Li-ion (3.0–4.2V), 5V/12V rails, and 24V industrial inputs without external pre-regulation. |
| Shutdown Current | 15μA max - preserves battery life in always-on or low-power sleep modes of portable systems. |
| Feedback Reference | 1.8V internal reference with ±1.8% tolerance - ensures accurate regulation without calibration or trimming. |
| Sync Range | 1.6MHz to 2MHz - allows EMI reduction via spread-spectrum or system-level clock alignment. |
Pinout & Package
LT1765EFE-1.8#PBF is housed in a 16-lead plastic TSSOP package with exposed thermal pad (Pin 17), rated for –40°C to 125°C junction temperature. The exposed pad must be soldered to a large copper plane for thermal performance (θJA = 45°C/W).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| GND (Pins 1, 8, 10, 16) | Power and signal ground reference | Multipoint GND connection minimizes ground bounce; exposed pad (Pin 17) is electrically tied to all GND pins and serves as primary thermal path. |
| BOOST (Pin 2) | Boost capacitor drive node | Provides >VIN voltage to saturate internal NPN switch; requires external 0.18μF capacitor and Schottky diode (e.g., CMDSH-3). |
| VIN (Pins 3, 4) | Main power input and internal bias supply | Both pins must be shorted externally; supplies internal regulator and switch collector - high di/dt demands local 4.7μF ceramic bypass. |
| SW (Pins 5, 6) | Switch emitter output | Drives inductor; swings from ~0V to VIN during operation; requires external catch diode clamped to ≤0.8V reverse breakdown. |
| FB (Pin 7) | Feedback sense input | Internally tied to 1.8V output - no external divider needed; enables direct monitoring of regulated rail. |
| SHDN (Pin 9) | Logic-level enable/disable control | Active-low; 1.33V threshold enables precise UVLO implementation; pulls high internally (3μA source) when floating. |
| VC (Pin 11) | Error amplifier output / current limit control | 0.4V–0.9V range sets peak switch current; usable for loop compensation, current limiting, or forced shutdown by pulling to GND. |
| SYNC (Pin 12) | External oscillator synchronization input | Accepts 1.6–2MHz logic-level signal (20–80% duty); disables internal oscillator when driven - eliminates beat frequencies in multi-rail systems. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated 3A, 0.09Ω NPN switch | Enables high-efficiency DC/DC conversion without external MOSFET or driver - reduces board area and component count. |
| Constant maximum switch current at all duty cycles | Guarantees consistent overcurrent protection regardless of input-output voltage ratio - simplifies fault handling in wide-input applications. |
| Thermally enhanced 16-lead TSSOP with exposed pad | Delivers θJC = 10°C/W - supports 3A operation at ambient up to 85°C with minimal PCB copper area. |
| 1.25MHz current-mode control | Provides fast transient response (<10μs to settle after 1A load step) and inherent loop stability - reduces need for complex compensation networks. |
| 15μA shutdown quiescent current | Extends battery runtime in standby mode - verified at VIN = 25V and SHDN = 0V. |
Applications
| Portable Computers | Battery-Powered Systems |
|---|---|
Use Scenario: Core voltage regulation for low-power microcontrollers and FPGAs in handheld tablets and ultrabooks. IC Role / Device Role / Timing Role: Primary 1.8V point-of-load converter delivering up to 3A with tight output tolerance and fast load-step response. Use Value: Eliminates need for external feedback resistors and reduces total solution size by >30% vs discrete controller + MOSFET solutions. | Use Scenario: Power management in medical sensors and IoT edge nodes operating from single Li-ion cells. IC Role / Device Role / Timing Role: Main system regulator converting 3.0–4.2V battery voltage to stable 1.8V for RF transceivers and precision ADCs. Use Value: 15μA shutdown current extends shelf life; wide 3V–25V input range avoids brownout during battery discharge. |
| Distributed Power | Regulated Wall Adapters |
Use Scenario: Secondary-side DC/DC stage in isolated AC/DC adapters supplying multiple voltage rails. IC Role / Device Role / Timing Role: Post-regulator providing clean, low-noise 1.8V for digital logic and memory interfaces downstream of main 5V/12V bus. Use Value: 1.25MHz switching enables small magnetics and ceramic caps - reduces adapter footprint and improves dynamic regulation. | Use Scenario: Compact USB-C PD accessory powering 1.8V peripherals from 5V–20V input. IC Role / Device Role / Timing Role: Fixed-output buck converter replacing linear regulators to achieve >85% efficiency at 2A load. Use Value: Integrated switch and current-mode control eliminate external gate drivers and current-sense resistors - lowers BOM cost and design risk. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar step-down regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTC3621EDD-1.8#TRPBF | 2.25MHz fixed-frequency, 2A max output, 2.7V–5.5V input range, different pinout and compensation scheme. | Optimized for ultra-low input voltage (e.g., single Li-ion), not suitable for 12V/24V inputs. | Select when input is strictly ≤5.5V and higher switching frequency is required to shrink passive size. |
| TPS54332DR | 3.5A, 1MHz, 3.5V–28V input, adjustable output only, requires external feedback resistors and boot capacitor. | Greater input range and current capability but lacks fixed 1.8V option and integrated boost diode drive. | Select when adjustable output or higher current (>3A) is needed, and board space allows external components. |
Compared with LTC3621EDD-1.8#TRPBF and TPS54332DR, the LT1765EFE-1.8#PBF uniquely combines fixed 1.8V output, 3V–25V input, integrated BOOST drive, and thermally optimized TSSOP - making it optimal for mid-range industrial and portable designs where simplicity, reliability, and thermal headroom are prioritized over ultra-high frequency or ultra-low input operation.
Availability
LT1765EFE-1.8#PBF is available at Aetrix Electronics and suitable for portable computers, battery-powered systems, and distributed power applications requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.
Supply support for LT1765EFE-1.8#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 acquired Linear Technology in 2017 and maintains its legacy of high-performance analog and power management ICs with rigorous qualification and long-term product support.
The LT1765 family was designed specifically for compact, high-efficiency DC/DC conversion in space-constrained and thermally demanding environments - emphasizing integration, thermal robustness, and ease of use in battery and industrial power systems.
FAQ
What is the guaranteed output voltage accuracy of the LT1765EFE-1.8#PBF?
The LT1765EFE-1.8#PBF guarantees a fixed 1.8V output with ±1.8% tolerance (1.764V to 1.836V) over the full –40°C to 125°C junction temperature range and 3V–25V input, as specified in the Electrical Characteristics table. This accuracy is achieved using an internal trimmed reference and does not require external calibration or trimming components.
Can the LT1765EFE-1.8#PBF operate from a single Li-ion battery?
Yes, the LT1765EFE-1.8#PBF supports input voltages as low as 3V, making it fully compatible with discharged single-cell Li-ion batteries (2.7V–4.2V). Its internal undervoltage lockout activates at 2.6V, ensuring reliable startup and preventing erratic operation near end-of-discharge.
Does the LT1765EFE-1.8#PBF require an external catch diode?
Yes, the LT1765EFE-1.8#PBF requires an external Schottky catch diode (e.g., CMDSH-3) connected from SW to output. The internal NPN switch lacks a body diode, and the diode's reverse breakdown must be <0.8V to clamp negative swing during switch-off - critical for reliability and efficiency.
How is thermal performance managed in the LT1765EFE-1.8#PBF package?
The LT1765EFE-1.8#PBF uses a 16-lead TSSOP with exposed thermal pad (Pin 17), achieving θJC = 10°C/W when soldered to ≥1 cm² copper area. Layout best practices include short GND traces, multiple thermal vias under the pad, and separation of high-di/dt paths from sensitive VC/FB nodes to maintain stability and minimize die temperature rise.
Is the LT1765EFE-1.8#PBF pin-compatible with other variants in the LT1765 family?
Yes, all LT1765EFE-x variants (including LT1765EFE-1.8#PBF, LT1765EFE-2.5#PBF, etc.) share identical 16-lead TSSOP pinout and electrical interface - only the internal feedback divider differs. This allows drop-in replacement across output voltages without PCB redesign, provided thermal and inductor selection match the new current/voltage requirements.
LT1765EFE-1.8#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:
- Fixed
- Number of Outputs:
- 1
- Voltage - Input (Min):
- 3V
- Voltage - Input (Max):
- 25V
- Voltage - Output (Min/Fixed):
- 1.8V
- Voltage - Output (Max):
- -
- Current - Output:
- 3A
- Frequency - Switching:
- 1.25MHz
- Synchronous Rectifier:
- No
- Operating Temperature:
- 0°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 16-TSSOP-EP
LT1765EFE-1.8#PBF FAQ
1.How can I place an order for LT1765EFE-1.8#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT1765EFE-1.8#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 LT1765EFE-1.8#PBF reliable?
The price and inventory of LT1765EFE-1.8#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT1765EFE-1.8#PBF is usually 5 days.
3.What payment methods are accepted for LT1765EFE-1.8#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT1765EFE-1.8#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT1765EFE-1.8#PBF?
LT1765EFE-1.8#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT1765EFE-1.8#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 LT1765EFE-1.8#PBF?
For technical support, including LT1765EFE-1.8#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT1765EFE-1.8#PBF requirements.
6.How does Aetrix verify that LT1765EFE-1.8#PBF is sourced from the original manufacturer or authorized distributors?
All LT1765EFE-1.8#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 LT1765EFE-1.8#PBF meets industry standards.
7.What is the process for return or replacement of LT1765EFE-1.8#PBF?
All LT1765EFE-1.8#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LT1765EFE-1.8#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 LT1765EFE-1.8#PBF part is unused and in its original packaging.
Return procedure for LT1765EFE-1.8#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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