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Analog Devices Inc. LT1765EFE-2.5#PBF
- Part No.:
- LT1765EFE-2.5#PBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 16-TSSOP (0.173", 4.40mm Width) Exposed Pad
- Datasheet:
-
LT1765EFE-2.5#PBF.pdf
- Description:
- IC REG BUCK 2.5V 3A 16TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:2,360
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Product details
Overview
LT1765EFE-2.5#PBF from Analog Devices (formerly Linear Technology) is a monolithic 3A, 1.25MHz current-mode step-down switching regulator with fixed 2.5V 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 DC/DC conversion in battery-powered systems and distributed power rails.
For engineers reviewing the LT1765EFE-2.5#PBF datasheet, LT1765EFE-2.5#PBF pinout, LT1765EFE-2.5#PBF application, or LT1765EFE-2.5#PBF equivalent, key selection criteria include its fixed 2.5V feedback reference (±2% over –40°C to 125°C), 15μA shutdown current, 1.25MHz switching frequency with external synchronization up to 2MHz, and thermal performance enabled by the exposed GND pad.
Technical Context
The LT1765EFE-2.5#PBF implements constant-frequency current-mode control using an internal 1.25MHz oscillator and cycle-by-cycle peak current sensing. Its bipolar NPN switch architecture relies on BOOST pin voltage (≥VIN + 1.8V) to ensure saturation, enabling high efficiency despite wide input range (3V–25V).
Feedback is internally configured for 2.5V output via a precision resistor divider; the FB pin connects directly to VOUT. The VC pin serves as error amplifier output and current limit threshold input, ranging from 0.4V (light load) to 0.9V (full load), supporting loop compensation and current clamping.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 2.5V ±2% (guaranteed over –40°C to 125°C junction temperature) |
| Switching Frequency | 1.25MHz typical; synchronizable to 1.6–2MHz for EMI reduction or clock alignment |
| Max Output Current | 3A continuous; maximum switch current remains constant regardless of duty cycle |
| Input Voltage Range | 3V to 25V; includes undervoltage lockout at 2.6V (typical) to protect low-voltage sources |
| Efficiency Enablers | 0.09Ω on-chip NPN switch; BOOST pin drive enables saturation; 1mA quiescent current improves light-load efficiency |
| Shutdown Current | 15μA (typical) at VIN = 25V - critical for battery runtime extension |
| Thermal Resistance | θJC(PAD) = 10°C/W; requires soldered exposed pad to large copper plane for 3A operation |
Pinout & Package
LT1765EFE-2.5#PBF uses a 16-lead thermally enhanced plastic TSSOP package with exposed GND pad (Pin 17). The dual VIN and dual VSW pins must be shorted together on PCB for optimal current handling and thermal conduction.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| GND (Pins 1, 8, 10, 16, Pad 17) | Power and signal reference ground | Must connect exposed pad and all GND pins to large copper area; forms primary thermal path and ensures stable load regulation |
| VIN (Pins 3, 4) | Input supply and switch collector | Supplies internal regulator and powers NPN switch; both pins must be shorted externally to minimize trace inductance and voltage spikes |
| VSW (Pins 5, 6) | Switch emitter node | Drives external catch diode; negative swing during off-time requires clamp diode with VBR < 0.8V; both pins must be shorted |
| BOOST (Pin 2) | Switch driver boost supply | Requires external capacitor/diode network to generate ≥VIN + 1.8V; enables full saturation of NPN switch for low conduction loss |
| FB (Pin 13) | Feedback input | Internally tied to 2.5V output; no external divider needed - simplifies layout and eliminates resistor tolerance errors |
| SHDN (Pin 14) | Enable/disable control | Logic-compatible input; 1.33V threshold enables precise UVLO implementation or remote on/off control |
| SYNC (Pin 11) | Oscillator synchronization input | Accepts 1.6–2MHz external clock with 20–80% duty cycle; eliminates beat frequencies in multi-regulator systems |
| VC (Pin 12) | Error amplifier output / current limit control | 0.4V–0.9V analog interface for loop compensation, current limiting, or external override - not a digital control pin |
Key Features
| Feature | Design Value |
|---|---|
| Integrated 3A NPN switch | Eliminates external MOSFET and gate driver; 0.09Ω RCE reduces conduction loss at full load |
| Current-mode control | Enables fast transient response to load steps and inherent cycle-by-cycle overcurrent protection |
| Thermally enhanced TSSOP | Exposed GND pad achieves θJC = 10°C/W - supports 3A operation without heatsink when properly mounted |
| Fixed 2.5V output configuration | Internal resistor divider removes external components; guarantees ±2% accuracy over full temperature range |
| Synchronization capability | External clock input prevents EMI peaks from drifting and enables deterministic timing in synchronized power systems |
Applications
| Portable Medical Sensors | Industrial PLC I/O Modules |
|---|---|
Use Scenario: Powering ultra-low-noise analog front-ends and ADCs in handheld diagnostic devices operating from single Li-ion cells. IC Role / Device Role / Timing Role: Primary 2.5V rail generator delivering clean, regulated power to precision signal chain components. Use Value: 15μA shutdown current extends battery life; 1.25MHz switching allows miniature 1.5μH inductors and ceramic capacitors to minimize board space. | Use Scenario: Providing isolated 2.5V logic supply for FPGA configuration memory and sensor interface circuitry in DIN-rail mounted controllers. IC Role / Device Role / Timing Role: High-reliability point-of-load regulator tolerant of 24V industrial bus transients and wide ambient temperature swings. Use Value: 3V–25V input range accommodates brownout conditions; constant 3A switch rating ensures consistent performance across varying line voltages. |
| Automotive Infotainment Displays | Test & Measurement Equipment |
Use Scenario: Generating stable 2.5V supply for RGB timing controllers and display interface ICs in automotive head units. IC Role / Device Role / Timing Role: Immune-to-ripple power source meeting automotive EMC requirements via synchronous clocking and compact LC filtering. Use Value: SYNC pin allows alignment with system master clock to suppress conducted emissions; thermally robust TSSOP withstands under-hood temperature cycling. | Use Scenario: Supplying calibrated 2.5V reference rails for high-resolution DACs and precision op-amps in benchtop analyzers. IC Role / Device Role / Timing Role: Low-drift, low-noise DC/DC converter where output accuracy and long-term stability are critical. Use Value: ±2% output tolerance over –40°C to 125°C ensures measurement integrity; minimal load regulation error preserves reference fidelity. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar step-down regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTC3631EMSE-2.5#PBF | Monolithic 3A buck with 3MHz switching, lower quiescent current (25μA), but requires external BOOT capacitor; no BOOST pin architecture | Better suited for ultra-compact designs needing higher frequency and smaller magnetics; less tolerant of high-VIN transients due to MOSFET gate drive limitations | Choose LTC3631EMSE-2.5#PBF when board space is constrained and 3MHz operation is acceptable; verify BOOT capacitor placement for reliability |
| TPS54332DR | 3A buck with integrated FETs, 0.5–28V input, adjustable output; lacks fixed 2.5V option and exposed thermal pad in SO-8 | Requires external feedback resistors; higher thermal resistance (θJA = 115°C/W) limits continuous 3A output without airflow or copper area | Choose TPS54332DR only if adjustable output or TI ecosystem compatibility is required; derate output current in still-air environments |
Compared with LTC3631EMSE-2.5#PBF and TPS54332DR, the LT1765EFE-2.5#PBF offers superior thermal performance via its exposed-pad TSSOP and proven bipolar switch architecture for high-input-voltage resilience, making it preferred for industrial and automotive applications demanding sustained 3A output across wide temperature ranges.
Availability
LT1765EFE-2.5#PBF is available at Aetrix Electronics and suitable for portable medical sensors, industrial PLC I/O modules, automotive infotainment displays, and test & measurement equipment requiring stable component supply and long-term obsolescence management.
Supply support for LT1765EFE-2.5#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 full technical and manufacturing continuity for the LT® product family.
The LT1765 series was designed specifically for high-current, high-frequency step-down conversion in space-constrained, thermally demanding applications - emphasizing integration, thermal robustness, and wide-input-voltage resilience.
FAQ
What is the guaranteed output voltage accuracy of the LT1765EFE-2.5#PBF over temperature?
The LT1765EFE-2.5#PBF guarantees ±2% output voltage accuracy over its full operating junction temperature range of –40°C to 125°C. This specification is assured by design, characterization, and statistical process controls - not just tested at 25°C. The internal resistor divider is trimmed during wafer sort to meet this tolerance, eliminating need for external calibration.
Can the LT1765EFE-2.5#PBF operate from a 2.8V input source?
No - the LT1765EFE-2.5#PBF has a minimum input voltage of 3V per Absolute Maximum Ratings and Electrical Characteristics tables. At 2.8V, the internal regulator enters undervoltage lockout (UVLO), preventing startup. For sub-3V operation, consider the LT3502A or other dedicated low-input buck regulators.
Why does the LT1765EFE-2.5#PBF use a bipolar NPN switch instead of a MOSFET?
Unlike MOSFET-based buck regulators, the LT1765EFE-2.5#PBF's integrated NPN switch leverages BOOST pin voltage to achieve deep saturation - resulting in consistent 0.09Ω on-resistance across input voltage and temperature. This architecture avoids MOSFET gate charge losses and body diode conduction issues, delivering higher efficiency at high VIN/VOUT ratios and improving reliability under surge conditions.
Is the exposed pad (Pin 17) of the LT1765EFE-2.5#PBF electrically connected to GND?
Yes - the exposed pad (Pin 17) is internally connected to the GND net and forms the primary thermal conduction path. It must be soldered to a large copper plane using multiple thermal vias. Leaving it unconnected or floating violates thermal design requirements and risks thermal shutdown or premature failure under 3A load.
Does the LT1765EFE-2.5#PBF require an external catch diode?
Yes - the LT1765EFE-2.5#PBF requires an external Schottky catch diode (e.g., CMDSH-3) connected between VSW and GND. The internal NPN switch lacks a body diode, and the diode provides the freewheeling path during switch-off time. Reverse voltage rating must exceed VIN, and forward voltage must be <0.8V to prevent excessive power dissipation and maintain efficiency.
LT1765EFE-2.5#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):
- 2.5V
- 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-2.5#PBF FAQ
1.How can I place an order for LT1765EFE-2.5#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT1765EFE-2.5#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-2.5#PBF reliable?
The price and inventory of LT1765EFE-2.5#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-2.5#PBF is usually 5 days.
3.What payment methods are accepted for LT1765EFE-2.5#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT1765EFE-2.5#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT1765EFE-2.5#PBF?
LT1765EFE-2.5#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT1765EFE-2.5#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-2.5#PBF?
For technical support, including LT1765EFE-2.5#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT1765EFE-2.5#PBF requirements.
6.How does Aetrix verify that LT1765EFE-2.5#PBF is sourced from the original manufacturer or authorized distributors?
All LT1765EFE-2.5#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-2.5#PBF meets industry standards.
7.What is the process for return or replacement of LT1765EFE-2.5#PBF?
All LT1765EFE-2.5#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LT1765EFE-2.5#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-2.5#PBF part is unused and in its original packaging.
Return procedure for LT1765EFE-2.5#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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