My Inquiry
My Account
Analog Devices Inc. LT1765EFE-2.5#TRPBF
- Part No.:
- LT1765EFE-2.5#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 16-TSSOP (0.173", 4.40mm Width) Exposed Pad
- Datasheet:
-
LT1765EFE-2.5#TRPBF.pdf
- Description:
- IC REG BUCK 2.5V 3A 16TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:1,932
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
LT1765EFE-2.5#TRPBF from Analog Devices (formerly Linear Technology) is a monolithic 3A, 1.25MHz current-mode buck switching regulator in a thermally enhanced 16-lead TSSOP package. It integrates a 0.09Ω NPN power switch, internal bias regulator, and oscillator. Designed for fixed 2.5V output, it operates from 3V to 25V input and delivers up to 3A with 2.5V ±2% accuracy at the FB pin, supporting portable computers and battery-powered systems.
For engineers reviewing the LT1765EFE-2.5#TRPBF datasheet, LT1765EFE-2.5#TRPBF pinout, LT1765EFE-2.5#TRPBF application, or LT1765EFE-2.5#TRPBF equivalent, key selection criteria include its 2.5V fixed output voltage, 1.25MHz constant-frequency operation, 3A maximum switch current, thermal performance in the exposed-pad TSSOP package, and synchronization capability up to 2MHz.
Technical Context
The LT1765EFE-2.5#TRPBF implements a constant-frequency, peak-current-mode control architecture with an internal 1.25MHz oscillator and dual-loop regulation: an error amplifier sets the per-cycle current limit via the VC pin, while a current-sense amplifier monitors switch current on a cycle-by-cycle basis. Its bipolar NPN switch uses BOOST pin drive for saturation, requiring external boost capacitor and diode.
It features internal undervoltage lockout (2.6V typical), 15μA shutdown current, and full-cycle current limiting with thermal shutdown. The fixed 2.5V output version integrates the feedback divider internally-FB pin connects directly to VOUT-and maintains constant maximum switch current across all duty cycles.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 2.5V ±2% (internally trimmed; no external resistors required) |
| Switching Frequency | 1.25MHz typical (constant frequency; synchronizable to 1.6–2MHz) |
| Max Output Current | 3A continuous (limited by internal 4A typical switch current limit) |
| Input Voltage Range | 3V to 25V (supports Li-ion, 5V/12V/24V systems) |
| Feedback Reference | 2.5V at FB pin (internal divider; FB tied directly to output) |
| Quiescent Current | 1mA typical operating supply current; 15μA in shutdown |
| Thermal Resistance | θJC(PAD) = 10°C/W (exposed pad soldered to copper plane) |
Pinout & Package
LT1765EFE-2.5#TRPBF is housed in a 16-lead plastic TSSOP package with exposed thermal pad (Pin 17). The package requires soldering the exposed pad to a large copper plane for optimal thermal performance (θJA = 45°C/W).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| GND (Pins 1, 8, 10, 16) | Power and signal ground reference | Multiple GND pins and exposed pad must be connected to low-impedance ground plane; critical for load regulation and thermal dissipation |
| BOOST (Pin 2) | Boost capacitor drive node | Provides >VIN gate drive to internal NPN switch; requires external 0.18μF capacitor and Schottky diode (e.g., CMDSH-3) |
| VIN (Pins 3, 4) | Main input power collector | Both pins must be shorted on PCB; supplies internal circuitry and powers switch collector; high di/dt node requiring local bypass |
| SW (Pins 5, 6) | Switch emitter output | Drives inductor; swings from ~0V to VIN; requires external catch diode clamping negative swing |
| FB (Pin 11) | Feedback input | Internally connected to 2.5V output; no external divider needed; used for current foldback below 0.5V |
| SHDN (Pin 12) | Shutdown control | Logic-compatible input; 1.33V threshold enables UVLO functionality; float or pull high for operation |
| VC (Pin 13) | Error amplifier output / current limit setpoint | 0.4V–0.9V range reflects load; used for compensation, current clamp, or loop override |
| SYNC (Pin 14) | Oscillator synchronization input | Accepts 1.6–2MHz external clock (20–80% duty); grounded when unused |
Key Features
| Feature | Design Value |
|---|---|
| Integrated 3A, 0.09Ω NPN switch | Enables compact, high-efficiency buck conversion without external MOSFET or driver |
| Current-mode control architecture | Delivers fast transient response and stable loop behavior across wide input/output ranges |
| Thermally enhanced 16-lead TSSOP | Exposed pad reduces θJC to 10°C/W-critical for sustained 3A operation at elevated ambient temperatures |
| Fixed 2.5V output with internal divider | Eliminates external resistor network, reducing BOM count and layout sensitivity |
| Synchronization to 2MHz | Allows EMI reduction via frequency dithering or alignment with system clocks |
Applications
| Portable Computers | Battery-Powered Systems |
|---|---|
Use Scenario: Core voltage regulation for embedded controllers or peripherals in laptops and tablets. IC Role / Device Role / Timing Role: Primary 2.5V step-down regulator delivering up to 3A from single-cell Li-ion or 5V USB-PD rails. Use Value: High efficiency at light-to-moderate loads (1mA quiescent current) extends runtime; thermal pad ensures reliability under burst-load conditions. | Use Scenario: Power management in handheld test equipment, medical sensors, or IoT edge nodes. IC Role / Device Role / Timing Role: Main system regulator converting 3.7V–12V battery or adapter input to stable 2.5V for analog front-ends and microcontrollers. Use Value: Wide 3V–25V input range accommodates varying battery states; 15μA shutdown current minimizes standby drain. |
| Regulated Wall Adapters | Distributed Power |
Use Scenario: Secondary regulation stage in multi-output AC/DC adapters supplying 2.5V logic rails. IC Role / Device Role / Timing Role: Post-regulator improving line/load regulation and ripple rejection of unregulated intermediate bus. Use Value: 1.25MHz switching enables small ceramic input/output capacitors and chip inductors, reducing solution footprint. | Use Scenario: Point-of-load conversion in industrial PLCs or telecom line cards requiring localized 2.5V supplies. IC Role / Device Role / Timing Role: Isolated or non-isolated buck converter feeding FPGA I/O banks or ADC reference circuits. Use Value: Synchronization capability allows noise-sensitive subsystems to align switching edges, easing EMI filtering. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar buck regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTC3632EMSE-2.5#TRPBF | 42V max input, 2.5V fixed, 2A output, 3mm × 4mm MSOP; higher Vin rating but lower current | Preferred for 24V industrial inputs where LT1765EFE-2.5#TRPBF's 25V absolute max leaves minimal margin | Select LTC3632EMSE-2.5#TRPBF when input exceeds 22V or board space is constrained; verify thermal derating at 3A |
| TPS54328DDAR | 2.95–6V input, 2.5V fixed, 3A output, 8-pin SO PowerPAD; lower Vin range, integrated FETs | Optimized for 3.3V/5V intermediate buses-not suitable for 12V/24V direct conversion | Choose TPS54328DDAR for cost-sensitive 5V-input designs; confirm compatibility with existing layout due to different pinout and thermal pad location |
Compared with LTC3632EMSE-2.5#TRPBF and TPS54328DDAR, LT1765EFE-2.5#TRPBF offers broader input range (3–25V) and higher thermal performance in TSSOP, making it uniquely suited for mixed-supply environments like portable computing and battery-backed instrumentation where both low-Vin startup and high-Vin robustness are required.
Availability
LT1765EFE-2.5#TRPBF is available at Aetrix Electronics and suitable for portable computers, battery-powered systems, and regulated wall adapters requiring stable component supply, long-term lifecycle support, and traceable sourcing.
Supply support for LT1765EFE-2.5#TRPBF 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 product support, documentation, and manufacturing continuity for the LT® series.
The LT1765 family was designed specifically for high-efficiency, high-current, high-frequency DC/DC conversion in space-constrained and thermally demanding applications-emphasizing integration, thermal robustness, and ease of use in portable and distributed power systems.
FAQ
What is the output voltage tolerance of the LT1765EFE-2.5#TRPBF?
The LT1765EFE-2.5#TRPBF provides a fixed 2.5V output with ±2% tolerance over temperature and line/load conditions, as specified in the Electrical Characteristics table. This accuracy is achieved via factory-trimmed internal feedback resistors-no external components affect the nominal output voltage.
Does the LT1765EFE-2.5#TRPBF require external feedback resistors?
No. The LT1765EFE-2.5#TRPBF integrates the feedback voltage divider internally. The FB pin is connected directly to the output, eliminating the need for external resistors. This simplifies design, improves accuracy, and reduces layout sensitivity compared to adjustable versions.
What is the minimum input voltage required for the LT1765EFE-2.5#TRPBF to regulate 2.5V?
The LT1765EFE-2.5#TRPBF requires a minimum input voltage of approximately 3.0V to maintain regulation at 2.5V output under typical load conditions. Below this, undervoltage lockout activates (2.6V typical threshold), disabling switching. Exact minimum depends on load current and inductor DCR.
How is thermal performance managed in the LT1765EFE-2.5#TRPBF package?
The LT1765EFE-2.5#TRPBF uses a 16-lead TSSOP with an exposed thermal pad (Pin 17). For optimal performance, this pad must be soldered to a large copper plane-achieving θJC(PAD) = 10°C/W. Board-level thermal resistance determines junction temperature; proper copper area and vias are essential for 3A continuous operation.
Can the LT1765EFE-2.5#TRPBF be synchronized to an external clock?
Yes. The LT1765EFE-2.5#TRPBF supports synchronization via its SYNC pin, accepting external logic-level signals from 1.6MHz to 2MHz with 20–80% duty cycle. When unused, SYNC must be grounded. Synchronization helps reduce EMI by aligning switching edges with system clocks or spreading noise spectrum.
LT1765EFE-2.5#TRPBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 16-TSSOP (0.173", 4.40mm Width) Exposed Pad
- Packaging:
- Tape & Reel (TR)
- 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#TRPBF FAQ
1.How can I place an order for LT1765EFE-2.5#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT1765EFE-2.5#TRPBF 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#TRPBF reliable?
The price and inventory of LT1765EFE-2.5#TRPBF 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#TRPBF is usually 5 days.
3.What payment methods are accepted for LT1765EFE-2.5#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT1765EFE-2.5#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT1765EFE-2.5#TRPBF?
LT1765EFE-2.5#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT1765EFE-2.5#TRPBF 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#TRPBF?
For technical support, including LT1765EFE-2.5#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT1765EFE-2.5#TRPBF requirements.
6.How does Aetrix verify that LT1765EFE-2.5#TRPBF is sourced from the original manufacturer or authorized distributors?
All LT1765EFE-2.5#TRPBF 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#TRPBF meets industry standards.
7.What is the process for return or replacement of LT1765EFE-2.5#TRPBF?
All LT1765EFE-2.5#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LT1765EFE-2.5#TRPBF, 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#TRPBF part is unused and in its original packaging.
Return procedure for LT1765EFE-2.5#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
LT1765EFE-2.5#TRPBF 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…
