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Analog Devices Inc. LT1765EFE#TRPBF
- Part No.:
- LT1765EFE#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 16-TSSOP (0.173", 4.40mm Width) Exposed Pad
- Datasheet:
-
LT1765EFE#TRPBF.pdf
- Description:
- IC REG BUCK ADJ 3A 16TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:4,373
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Product details
Overview
LT1765EFE#TRPBF from Analog Devices (formerly Linear Technology) is a monolithic 3A, 1.25MHz current-mode step-down switching regulator in a thermally enhanced 16-lead TSSOP package. It integrates a 0.09Ω NPN power switch, internal bias regulator, and full cycle-by-cycle current control. Designed for high-efficiency DC/DC conversion from 3V–25V input to fixed 5V output, it delivers stable 3A continuous current in portable computers and battery-powered systems.
For engineers reviewing the LT1765EFE#TRPBF datasheet, LT1765EFE#TRPBF pinout, LT1765EFE#TRPBF application, or LT1765EFE#TRPBF equivalent, key selection criteria include its constant 1.25MHz switching frequency, 15μA shutdown current, 1.2V feedback reference, thermal performance with θJC(PAD) = 10°C/W, and synchronization capability up to 2MHz.
Technical Context
The LT1765EFE#TRPBF implements constant-frequency current-mode control using an internal 1.25MHz oscillator and dual-loop feedback: an error amplifier sets the peak switch current threshold via the VC pin, while a current-sense amplifier monitors switch current on a cycle-by-cycle basis. This architecture ensures fast transient response and inherent loop stability without external compensation complexity.
It employs a bipolar NPN power switch driven by a BOOST pin voltage ≥ VIN + 2.7V to maintain saturation, enabling high efficiency across wide input ranges (3V–25V). The internal 1.2V feedback reference and fixed 5V output configuration eliminate external resistor networks, and the SHDN pin provides precise 1.33V UVLO functionality with 7μA hysteresis current.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 5V ±1% (guaranteed over –40°C to 125°C junction temperature) |
| Switch Current Limit | 3A typical, 4A minimum - enables 3A continuous output with margin for transients and thermal derating |
| Switching Frequency | 1.25MHz typical - allows use of small chip inductors (e.g., 1.5μH) and ceramic capacitors, reducing board area |
| Input Voltage Range | 3V to 25V - supports Li-ion batteries (3.0–4.2V), 5V/12V rails, and 24V industrial systems |
| Shutdown Current | 15μA maximum - extends battery life in portable applications during sleep mode |
| Feedback Reference | 1.2V ±1.5% - sets output accuracy; internal divider eliminates external resistors for fixed 5V version |
| Thermal Resistance | θJC(PAD) = 10°C/W - requires exposed pad soldered to large copper plane for reliable 3A operation at 125°C ambient |
Pinout & Package
LT1765EFE#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 path integrity and thermal conduction.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| GND (Pins 1, 8, 10, 16) | Power and signal ground reference | Must connect to low-impedance ground plane; all GND pins and exposed pad must be soldered to maximize thermal dissipation (θJC = 10°C/W) |
| BOOST (Pin 2) | Boost capacitor drive node | Supplies >VIN voltage to saturate NPN switch; requires 0.18μF capacitor and CMDSH-3 diode; minimum headroom = 2.7V above SW |
| VIN (Pins 3, 4) | Main input power supply | Connects to collector of internal NPN switch; both pins must be shorted externally; bypass with 1–4.7μF ceramic capacitor near pin |
| SW (Pins 5, 6) | Switch emitter output | Drives inductor; swings from ~0V to VIN; requires external catch diode (e.g., CMDSH-3) with VBR < 0.8V; both pins must be shorted externally |
| NC (Pins 7, 11, 14) | No-connect terminals | Not bonded internally; must remain unconnected on PCB to avoid parasitic coupling or thermal interference |
| SYNC (Pin 12) | External clock synchronization input | Logic-compatible (20–80% duty); locks internal oscillator to 1.6–2MHz; tie to GND if unused |
| VC (Pin 13) | Error amplifier output / current limit control | 0.4V–0.9V range reflects load; used for compensation or current clamping; driving to GND disables output |
| FB (Pin 15) | Feedback input | Internally connected to 5V output; no external divider needed; <5kΩ impedance required only if using foldback feature |
| SHDN (Pin 17) | Shutdown control input | 1.33V threshold enables precise UVLO; pull high or float for operation; sink current = –10μA when active |
Key Features
| Feature | Design Value |
|---|---|
| Integrated 3A, 0.09Ω NPN switch | Eliminates external MOSFET and driver, reducing BOM count and layout complexity for compact 5V/3A supplies |
| Constant 1.25MHz switching frequency | Enables consistent EMI filtering design and predictable inductor sizing; supports synchronization up to 2MHz for system-level noise management |
| Full cycle-by-cycle current limiting | Provides robust short-circuit protection without external sensing; maintains 3A limit across all duty cycles, independent of input/output ratio |
| Low 15μA shutdown current | Extends runtime in battery-powered devices such as DSL modems and portable computers during standby |
| Thermally enhanced 16-lead TSSOP | Exposed pad delivers θJC = 10°C/W - enables 3A operation at 125°C ambient when soldered to ≥1 cm² copper area |
Applications
| DSL Modem Power Supply | Portable Computer Core Rail |
|---|---|
Use Scenario: Providing regulated 5V/2.5A to DSL line card PHY and microcontroller under variable AC adapter or PoE input. IC Role / Device Role / Timing Role: Primary step-down regulator converting 12V or 24V input to stable 5V output with fast load-step response. Use Value: 1.25MHz operation minimizes filter component size; 15μA shutdown current preserves backup battery life during idle periods. |
Use Scenario: Generating 5V main rail for USB peripherals and I/O controllers in ultrabook designs powered by single-cell Li-ion. IC Role / Device Role / Timing Role: High-efficiency buck converter operating from 3.0–4.2V battery input to deliver 5V at up to 3A peak. Use Value: Wide 3V–25V input range accommodates battery sag and adapter transitions; thermal pad enables sustained 3A output without derating. |
| Regulated Wall Adapter Interface | Battery-Powered Industrial Sensor Node |
Use Scenario: Converting unregulated 9V–15V wall adapter output to clean 5V for embedded microcontrollers and analog front-ends. IC Role / Device Role / Timing Role: Fixed-output DC/DC regulator with integrated current limiting and thermal shutdown. Use Value: 1.2V feedback reference and internal divider ensure ±1% output accuracy without calibration; SYNC pin allows EMI spread-spectrum alignment. |
Use Scenario: Powering wireless sensor modules (BLE/Zigbee) from two AA alkaline cells (1.8–3.2V) while maintaining 5V USB-compliant output. IC Role / Device Role / Timing Role: High-efficiency buck converter supporting wide input range and ultra-low quiescent current in intermittent transmit mode. Use Value: 1mA operating supply current improves light-load efficiency; 15μA shutdown current enables multi-year battery life in sleep-dominated operation. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar step-down regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTC3632EMSE#PBF | 4A rated, 3MHz switching, requires external feedback resistors; higher IQ (2.5mA) | Better suited for space-constrained designs needing >3A or >2MHz sync; less optimal for battery life-critical apps due to higher quiescent current | Select LTC3632EMSE#PBF when higher output current or faster transient response is required, and PCB area permits smaller inductors. |
| TPS54331DR | 3A, 570kHz max frequency, integrated FET but lower efficiency at 1.25MHz; 4.5–28V input | Lower switching frequency increases inductor/capacitor size; better for cost-sensitive industrial supplies where EMI is less critical than size | Choose TPS54331DR for cost-driven 5V/3A designs where board area is not constrained and 1.25MHz EMI compliance is not mandatory. |
Compared with LTC3632EMSE#PBF and TPS54331DR, the LT1765EFE#TRPBF uniquely balances 3A capability, 1.25MHz fixed frequency, 15μA shutdown, and thermally optimized TSSOP packaging-making it optimal for portable, battery-aware, and space-limited 5V supply designs where consistent EMI behavior and long runtime are prioritized.
Availability
LT1765EFE#TRPBF is available at Aetrix Electronics and suitable for DSL modems, portable computers, regulated wall adapters, battery-powered systems, and distributed power architectures requiring stable component supply, long-term lifecycle support, and lead-free RoHS-compliant packaging.
Supply support for LT1765EFE#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, Inc. (ADI) is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, formed through the acquisition of Linear Technology in 2017.
The LT1765EFE#TRPBF belongs to ADI's legacy Linear Technology power management portfolio, designed specifically for compact, high-efficiency, fixed-output DC/DC conversion in portable and battery-operated equipment demanding reliability across –40°C to 125°C.
FAQ
What is the output voltage configuration of the LT1765EFE#TRPBF?
The LT1765EFE#TRPBF is a fixed 5V output variant. Its feedback network is fully internal - the FB pin connects directly to the output, eliminating the need for external resistors. Output voltage is guaranteed at 5V ±1% over the full –40°C to 125°C junction temperature range, with typical accuracy of ±0.5% at 25°C. This differs from the adjustable LT1765 (no suffix), which requires an external resistor divider to set VOUT.
Does the LT1765EFE#TRPBF require an external catch diode, and what are the key specifications?
Yes, the LT1765EFE#TRPBF requires an external Schottky catch diode connected between SW and GND. The diode must withstand peak reverse voltage equal to VIN and conduct average forward current up to ~2.5A (calculated as IOUT × (VIN − VOUT)/VIN). The CMDSH-3 is explicitly recommended in the datasheet: 40V VRRM, 3A IF(AV), <0.45V VF at 3A, and low capacitance to minimize switching losses.
How is thermal management implemented for the LT1765EFE#TRPBF in high-current operation?
The LT1765EFE#TRPBF uses an exposed thermal pad (Pin 17) that must be soldered to a large copper plane to achieve its specified θJC(PAD) = 10°C/W. Layout requires short, low-inductance connections for VIN, SW, and GND pins; dual VIN and dual SW pins must be shorted externally on the PCB. Thermal performance is validated at 3A continuous load with ambient ≤125°C only when the exposed pad is properly connected to ≥1 cm² of internal/external copper.
Can the LT1765EFE#TRPBF be synchronized to an external clock, and what are the valid frequency and interface requirements?
Yes, the LT1765EFE#TRPBF supports synchronization via its SYNC pin. It accepts logic-level signals (20–80% duty cycle) in the 1.6MHz to 2MHz range. The pin has 20kΩ input resistance and requires no external bias; it must be grounded if unused. Synchronization above 1.8MHz reduces internal slope compensation amplitude, so operation >1.8MHz is recommended only with inductors ≥2.2μH and VIN/VOUT ratios >2 to avoid subharmonic oscillation.
What is the purpose and connection method for the BOOST pin on the LT1765EFE#TRPBF?
The BOOST pin supplies a voltage higher than VIN to fully saturate the internal NPN switch, minimizing conduction loss. It is driven by a charge pump formed by a 0.18μF capacitor and CMDSH-3 diode, with the diode anode typically tied to the 5V output. The BOOST voltage must exceed SW by ≥2.7V during the on-time; if VOUT < 3.3V, an alternate boost source (e.g., VIN or dedicated LDO) is required to maintain saturation and efficiency.
LT1765EFE#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:
- Adjustable
- Number of Outputs:
- 1
- Voltage - Input (Min):
- 3V
- Voltage - Input (Max):
- 25V
- Voltage - Output (Min/Fixed):
- 1.2V
- Voltage - Output (Max):
- 22.5V
- 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#TRPBF FAQ
1.How can I place an order for LT1765EFE#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT1765EFE#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#TRPBF reliable?
The price and inventory of LT1765EFE#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#TRPBF is usually 5 days.
3.What payment methods are accepted for LT1765EFE#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT1765EFE#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT1765EFE#TRPBF?
LT1765EFE#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT1765EFE#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#TRPBF?
For technical support, including LT1765EFE#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT1765EFE#TRPBF requirements.
6.How does Aetrix verify that LT1765EFE#TRPBF is sourced from the original manufacturer or authorized distributors?
All LT1765EFE#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#TRPBF meets industry standards.
7.What is the process for return or replacement of LT1765EFE#TRPBF?
All LT1765EFE#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LT1765EFE#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#TRPBF part is unused and in its original packaging.
Return procedure for LT1765EFE#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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