My Inquiry
My Account
Analog Devices Inc. LT1765EFE-3.3#TRPBF
- Part No.:
- LT1765EFE-3.3#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 16-TSSOP (0.173", 4.40mm Width) Exposed Pad
- Datasheet:
-
LT1765EFE-3.3#TRPBF.pdf
- Description:
- IC REG BUCK 3.3V 3A 16TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:3,563
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
LT1765EFE-3.3#TRPBF from Analog Devices (formerly Linear Technology) is a monolithic 3A, 1.25MHz current-mode step-down switching regulator with fixed 3.3V output, integrated 0.09Ω NPN power switch, and thermal shutdown. It operates from 3V to 25V input, delivers up to 2.5A continuous output, and targets compact DC/DC conversion in battery-powered systems and distributed power rails.
For engineers reviewing the LT1765EFE-3.3#TRPBF datasheet, LT1765EFE-3.3#TRPBF pinout, LT1765EFE-3.3#TRPBF application, or LT1765EFE-3.3#TRPBF equivalent, key selection criteria include its fixed 3.3V output accuracy (±2%), 15μA shutdown current, 16-lead thermally enhanced TSSOP package with exposed pad, and synchronization capability up to 2MHz for EMI control.
Technical Context
The LT1765EFE-3.3#TRPBF implements constant-frequency current-mode control using an internal 1.25MHz oscillator and cycle-by-cycle peak current limiting. Its feedback loop references a precise 3.3V internal divider (3.234V–3.366V), eliminating external resistor networks. The BOOST pin enables saturation drive of the on-die NPN switch via an external capacitor-diode network.
It integrates full-cycle current protection, thermal shutdown, and a dedicated VC pin for error amplifier output and current clamp functionality. Synchronization is achieved via logic-level SYNC input (1.6–2MHz range), while SHDN provides 1.33V threshold undervoltage lockout with 7μA hysteresis current.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 3.3V ±2% (3.234V–3.366V); eliminates need for external feedback resistors |
| Switch Current Limit | 3A typical, 4A minimum; constant across all duty cycles for reliable overload handling |
| Switching Frequency | 1.25MHz typical (1.1–1.6MHz); enables use of small chip inductors & ceramic capacitors |
| Input Voltage Range | 3V to 25V; supports Li-ion batteries and 24V industrial rails without external regulators |
| Shutdown Current | 15μA typical; extends battery life in portable systems during sleep mode |
| Feedback Reference | Internally trimmed 3.3V output; no FB pin external connection required for fixed-voltage operation |
| Thermal Resistance | θJC(PAD) = 10°C/W; requires soldered exposed pad to large copper plane for 2.5A continuous operation |
Pinout & Package
LT1765EFE-3.3#TRPBF is housed in a 16-lead plastic TSSOP package with exposed thermal pad (Pin 17). The package features dual VIN and dual VSW pins internally shorted, requiring external PCB shorting for optimal high-current routing and thermal performance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| GND (Pins 1, 8, 10, 16) | Power and signal reference ground | Must connect all GND pins + exposed pad to large copper plane; critical for thermal dissipation and load regulation |
| BOOST (Pin 2) | Boost voltage supply for NPN switch driver | Requires external 0.18μF capacitor + Schottky diode; supplies >VIN voltage to saturate internal switch |
| VIN (Pins 3, 4) | Main input power and internal bias supply | Both pins must be shorted externally; bypass capacitor must be placed adjacent to minimize di/dt-induced spikes |
| VSW (Pins 5, 6) | Emitter of internal NPN power switch | Both pins must be shorted externally; drives inductor; requires external catch diode clamping negative swing |
| SYNC (Pin 11) | Oscillator synchronization input | Logic-compatible (1.5–2.2V threshold); accepts 1.6–2MHz external clock to reduce EMI |
| VC (Pin 12) | Error amplifier output / current limit control | Used for loop compensation; also serves as current clamp point (0.4V–0.9V operating range) |
| FB (Pin 13) | Feedback input | Internally connected to 3.3V output; no external divider needed for fixed-output operation |
| SHDN (Pin 14) | Shutdown control input | 1.33V threshold; float or tie high for operation; 7μA hysteresis enables precise UVLO implementation |
Key Features
| Feature | Design Value |
|---|---|
| Integrated 0.09Ω NPN switch | Enables high-efficiency 3A buck conversion without external MOSFETs or gate drivers |
| Thermally enhanced TSSOP-16 | Exposed pad reduces θJC to 10°C/W, supporting 2.5A continuous output with proper PCB copper |
| Current-mode control architecture | Delivers fast transient response and inherent cycle-by-cycle overcurrent protection |
| Synchronizable 1.25MHz oscillator | Allows EMI reduction by aligning switching frequency with system clocks or noise-sensitive bands |
| Low 1mA quiescent current | Maintains high light-load efficiency in always-on battery-powered applications |
Applications
| DSL Modems | Portable Computers |
|---|---|
Use Scenario: Powering core logic and PHY circuitry from 5V or 12V rails in compact DSL modems with strict thermal constraints. IC Role / Device Role / Timing Role: Primary 3.3V step-down regulator delivering up to 2.5A with minimal board area and heat generation. Use Value: Enables use of low-profile chip inductors and ceramic capacitors, reducing solution height and improving reliability vs. discrete solutions. | Use Scenario: Generating stable 3.3V supply for USB controllers, I/O interfaces, and embedded controllers in ultraportable laptops. IC Role / Device Role / Timing Role: High-efficiency DC/DC converter operating from single-cell Li-ion (3.0–4.2V) or multi-cell battery inputs. Use Value: 15μA shutdown current extends standby battery life; 1.25MHz switching avoids audible noise and simplifies filtering. |
| Regulated Wall Adapters | Battery-Powered Systems |
Use Scenario: Secondary regulation stage in universal-input AC/DC adapters delivering regulated 3.3V outputs for IoT gateways and smart home hubs. IC Role / Device Role / Timing Role: Post-regulator ensuring tight output tolerance (±2%) and low ripple despite varying upstream DC bus conditions. Use Value: Fixed 3.3V output eliminates calibration overhead; wide 3–25V input accommodates unregulated intermediate rails. | Use Scenario: Main power supply for handheld medical devices, barcode scanners, and portable test equipment running from primary alkaline or Li-ion cells. IC Role / Device Role / Timing Role: High-current buck converter with built-in UVLO to prevent deep battery discharge below safe cutoff voltage. Use Value: SHDN pin's 1.33V threshold enables precise undervoltage lockout; thermal shutdown protects against enclosure overheating. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar step-down regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTC3630EMSE-3.3#PBF | Higher 4MHz switching frequency; lower 1.5A output current; requires external MOSFETs | Better suited for ultra-compact designs where size outweighs current requirement | Select if board space is constrained and 1.5A suffices; avoid if >2A continuous load is needed |
| TPS54332DR | 3.5A current rating; 2.5–28V input; adjustable output; no integrated BOOST circuit | Requires external feedback resistors and boost components; wider input range | Choose when design flexibility (adjustable VOUT) and higher current are prioritized over simplicity and fixed-output integration |
Compared with LTC3630EMSE-3.3#PBF and TPS54332DR, LT1765EFE-3.3#TRPBF offers the best balance of integrated fixed 3.3V output, 3A switch capability, and thermally optimized TSSOP package - ideal for cost-sensitive, medium-power applications where layout simplicity and thermal management are critical.
Availability
LT1765EFE-3.3#TRPBF is available at Aetrix Electronics and suitable for DSL modems, portable computers, and battery-powered systems requiring stable component supply, consistent parametric performance, and long-term production continuity.
Supply support for LT1765EFE-3.3#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 its legacy of high-performance analog and power management ICs.
The LT1765 product line was designed for high-efficiency, high-frequency DC/DC conversion in space-constrained and thermally demanding applications - especially portable, telecom, and industrial systems requiring robust 3A buck regulation.
FAQ
What is the maximum continuous output current of the LT1765EFE-3.3#TRPBF?
The LT1765EFE-3.3#TRPBF delivers up to 2.5A continuous output current under typical thermal conditions (θJA = 45°C/W with exposed pad soldered to large copper plane). This is limited by thermal design rather than switch current rating, which is 3A minimum. At elevated ambient temperatures or reduced copper area, output current must be derated per thermal calculations in the datasheet.
Does the LT1765EFE-3.3#TRPBF require external feedback resistors?
No. The LT1765EFE-3.3#TRPBF has the 3.3V feedback divider integrated internally. The FB pin is directly connected to the output, eliminating external resistors and associated tolerance errors. This ensures guaranteed output accuracy of ±2% (3.234V–3.366V) without calibration.
How is thermal performance managed in the LT1765EFE-3.3#TRPBF package?
The LT1765EFE-3.3#TRPBF uses a 16-lead TSSOP with an exposed thermal pad (Pin 17). For optimal thermal performance, this pad must be soldered to a large copper plane using multiple thermal vias. With proper layout, θJC(PAD) is 10°C/W, enabling 2.5A continuous operation at 125°C junction temperature.
Can the LT1765EFE-3.3#TRPBF be synchronized to an external clock?
Yes. The LT1765EFE-3.3#TRPBF includes a dedicated SYNC pin that accepts logic-level signals from 1.6MHz to 2MHz. This allows EMI reduction by aligning switching frequency with system clocks or avoiding sensitive frequency bands - a feature not available in many competing fixed-output regulators.
What is the purpose of the BOOST pin on the LT1765EFE-3.3#TRPBF?
The BOOST pin on the LT1765EFE-3.3#TRPBF supplies a boosted voltage (>VIN) to the internal NPN switch driver, ensuring full saturation and minimizing conduction losses. It requires an external 0.18μF capacitor and Schottky diode (e.g., CMDSH-3), typically connected between output and BOOST to generate ~VOUT above VIN.
LT1765EFE-3.3#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):
- 3.3V
- 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-3.3#TRPBF FAQ
1.How can I place an order for LT1765EFE-3.3#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT1765EFE-3.3#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-3.3#TRPBF reliable?
The price and inventory of LT1765EFE-3.3#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-3.3#TRPBF is usually 5 days.
3.What payment methods are accepted for LT1765EFE-3.3#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT1765EFE-3.3#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT1765EFE-3.3#TRPBF?
LT1765EFE-3.3#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT1765EFE-3.3#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-3.3#TRPBF?
For technical support, including LT1765EFE-3.3#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT1765EFE-3.3#TRPBF requirements.
6.How does Aetrix verify that LT1765EFE-3.3#TRPBF is sourced from the original manufacturer or authorized distributors?
All LT1765EFE-3.3#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-3.3#TRPBF meets industry standards.
7.What is the process for return or replacement of LT1765EFE-3.3#TRPBF?
All LT1765EFE-3.3#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LT1765EFE-3.3#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-3.3#TRPBF part is unused and in its original packaging.
Return procedure for LT1765EFE-3.3#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
LT1765EFE-3.3#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…
