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Analog Devices Inc. LT1765EFE-1.8#TRPBF
- Part No.:
- LT1765EFE-1.8#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 16-TSSOP (0.173", 4.40mm Width) Exposed Pad
- Datasheet:
-
LT1765EFE-1.8#TRPBF.pdf
- Description:
- IC REG BUCK 1.8V 3A 16TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:4,980
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Product details
Overview
LT1765EFE-1.8#TRPBF 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#TRPBF datasheet, LT1765EFE-1.8#TRPBF pinout, LT1765EFE-1.8#TRPBF application, or LT1765EFE-1.8#TRPBF equivalent, key selection criteria include its fixed 1.8V feedback reference (±1.8% over temperature), 15μA shutdown current, 1.25MHz switching frequency enabling small external components, and thermal performance enabled by the exposed GND pad in the TSSOP-16 package.
Technical Context
The LT1765EFE-1.8#TRPBF implements constant-frequency current-mode control using an internal 1.25MHz oscillator, cycle-by-cycle peak current sensing, and a transconductance error amplifier (gm = 850 μMho) with VC pin access for compensation or current limiting. Its bipolar NPN switch architecture requires external BOOST capacitor and diode to maintain saturation under high-duty-cycle conditions.
It features built-in undervoltage lockout (2.6V threshold), logic-compatible SYNC input supporting 1.6–2MHz synchronization, and full-cycle thermal shutdown. The fixed 1.8V version integrates the feedback divider internally, connecting FB directly to VOUT - eliminating external resistor selection while preserving the same 1.2V reference accuracy as the adjustable variant.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 1.8V ±1.8% over –40°C to 125°C junction range - enables precise core voltage regulation without external resistors. |
| Max Output Current | 3A continuous - supported by on-die 0.09Ω NPN switch and thermally enhanced TSSOP-16 with θJC(PAD) = 10°C/W. |
| Switching Frequency | 1.25MHz (typ), synchronizable to 1.6–2MHz - allows use of sub-3μH chip inductors and <5μF ceramic input/output capacitors. |
| Input Voltage Range | 3V to 25V - accommodates single Li-ion (3.0–4.2V), 5V/12V/24V rails, and wide-input industrial supplies. |
| Shutdown Current | 15μA (typ) at VIN = 25V - extends battery life in always-on or low-power standby modes. |
| Feedback Reference | 1.2V internal reference with ±1.8% tolerance - ensures stable 1.8V output via integrated resistor divider (R1/R2 = 0.5). |
| Efficiency Enablers | 1mA quiescent supply current, BOOST-driven saturated switch, and current-mode loop stability - achieves >85% efficiency at 1A load with 12V→1.8V conversion. |
Pinout & Package
LT1765EFE-1.8#TRPBF is housed in a 16-lead plastic TSSOP with exposed GND pad (Pin 17), optimized for thermal dissipation (θJA = 45°C/W). The dual VIN (Pins 3,4) and dual VSW (Pins 6,7) require PCB shorting per layout guidelines to minimize parasitic inductance.
| 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 plane - primary thermal path and critical for load regulation accuracy. |
| BOOST (Pin 2) | Switch driver bootstrap supply | Requires external 0.18μF capacitor + Schottky diode (e.g., CMDSH-3); provides >VIN voltage to saturate NPN switch during on-time. |
| VIN (Pins 3,4) | Input power and internal bias supply | Both pins must be shorted on PCB; high-di/dt node - bypass capacitor must be placed adjacent to minimize flyback spikes. |
| VSW (Pins 6,7) | Emitter of internal NPN power switch | Both pins must be shorted; drives inductor; negative swing during off-time requires external catch diode (VBR < 0.8V). |
| FB (Pin 9) | Feedback input | Internally connected to 1.8V output - no external divider needed; used for current limit foldback when <0.5V. |
| SYNC (Pin 11) | Oscillator synchronization input | Logic-level compatible (1.5–2.2V threshold); accepts 1.6–2MHz external clock to eliminate beat frequencies in multi-regulator systems. |
| SHDN (Pin 12) | Enable/disable control | 1.33V threshold; float or tie to VIN for operation; pull to GND for 15μA shutdown - also usable as precision UVLO input. |
| VC (Pin 13) | Error amplifier output / current limit control | 0.4V–0.9V range under load; accessible for loop compensation, current clamping, or forced shutdown by pulling to GND. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated 3A, 0.09Ω NPN switch | Eliminates external MOSFET and gate driver - reduces BOM count and PCB area while maintaining high efficiency at 1.25MHz. |
| Constant max switch current at all duty cycles | Ensures predictable current-limit behavior regardless of input-output ratio - simplifies overcurrent protection design in wide-VIN applications. |
| Thermally enhanced TSSOP-16 with exposed pad | Enables 3A operation without heatsink - θJC(PAD) = 10°C/W supports >2W power dissipation with proper board copper. |
| 1.25MHz current-mode architecture | Delivers fast transient response (<10μs to settle) and inherent loop stability - reduces need for complex compensation networks. |
| 15μA shutdown current with UVLO capability | Extends battery runtime and prevents brownout operation - SHDN pin doubles as accurate 1.33V comparator for custom input monitoring. |
Applications
| Microprocessor Core Supply | Portable SSD Power Rail |
|---|---|
Use Scenario: Providing clean, regulated 1.8V to ARM Cortex-A series CPU cores in handheld tablets with dynamic voltage scaling. IC Role / Device Role / Timing Role: Primary point-of-load DC/DC converter delivering up to 3A peak current with tight transient response to handle burst-mode execution. Use Value: Fixed 1.8V output eliminates resistor tolerance errors; 1.25MHz switching enables use of 1.5μH shielded inductor and 2.2μF X7R ceramic output cap - reducing solution size by >40% vs lower-frequency alternatives. | Use Scenario: Generating 1.8V VCCQ rail for NVMe SSD controllers in ultra-thin laptops powered by single-cell Li-ion batteries. IC Role / Device Role / Timing Role: High-efficiency buck regulator operating across 3.0–4.2V input range, maintaining >87% efficiency at 2A load during sustained read/write bursts. Use Value: 15μA shutdown current preserves battery charge during sleep states; thermally robust TSSOP-16 package sustains 3A output without derating in confined chassis space. |
| Industrial Sensor Node MCU Supply | Automotive Infotainment SoC I/O Rail |
Use Scenario: Powering 1.8V I/O and analog peripherals of low-power microcontrollers in wireless sensor nodes deployed in harsh environments. IC Role / Device Role / Timing Role: Input-capable down to 3V supports brownout operation during battery discharge; SYNC input allows noise-free timing alignment with system master clock. Use Value: Wide 3V–25V input range accommodates 12V vehicle bus with transient suppression; 1.25MHz frequency avoids AM radio band interference in EMI-sensitive deployments. | Use Scenario: Delivering 1.8V to high-speed SerDes interfaces and memory I/O buffers in automotive infotainment head units with 5V/12V supply rails. IC Role / Device Role / Timing Role: Secondary buck stage following a pre-regulator, requiring precise 1.8V tolerance (±2%) and immunity to engine cranking transients. Use Value: Integrated 1.2V reference with ±1.8% accuracy meets AEC-Q200-relevant stability requirements; exposed-pad TSSOP-16 supports conduction cooling in sealed enclosures. |
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#TRMPBF | 4MHz synchronous buck, 2A max, 2.7–5.5V input, integrated MOSFETs, 25μA IQ | Better suited for ultra-low-input (Li-ion only), higher-frequency, lower-current applications where board space is critical | Select LTC3621EDD-1.8#TRMPBF when input is strictly ≤5.5V and peak current ≤2A - trades 3A capability for smaller 10-lead DFN and higher efficiency at light loads. |
| TPS54332DDAR | 3.5A synchronous buck, 3.5–28V input, 2.5V–15V adjustable output, 100μA IQ, no exposed thermal pad | Requires external feedback resistors; lacks integrated thermal pad - needs careful thermal design for 3A continuous operation | Select TPS54332DDAR when adjustable output or wider input range (up to 28V) is required, and thermal management via heatsink or airflow is feasible. |
Compared with LTC3621EDD-1.8#TRMPBF and TPS54332DDAR, the LT1765EFE-1.8#TRPBF uniquely combines fixed 1.8V output, 3A capability, 1.25MHz operation, and thermally optimized TSSOP-16 packaging - making it optimal for cost-sensitive, medium-power, wide-input industrial and portable designs where simplicity and thermal reliability are prioritized over ultra-low IQ or synchronous rectification.
Availability
LT1765EFE-1.8#TRPBF is available at Aetrix Electronics and suitable for portable computing, battery-powered instrumentation, and industrial sensor node applications requiring stable component supply, long-term lifecycle support, and consistent parametric performance across temperature.
Supply support for LT1765EFE-1.8#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. (acquired Linear Technology in 2017) is a global leader in high-performance analog, mixed-signal, and power management semiconductors.
The LT1765 product line was designed specifically for high-efficiency, medium-current DC/DC conversion in space-constrained and thermally demanding applications - emphasizing monolithic integration, wide input range, and robust thermal performance without external FETs.
FAQ
What is the guaranteed output voltage accuracy of the LT1765EFE-1.8#TRPBF over temperature?
The LT1765EFE-1.8#TRPBF guarantees output voltage accuracy of ±1.8% over the full –40°C to 125°C junction temperature range. This is derived from the internal 1.2V reference (±1.8% tolerance) and fixed resistor divider network, ensuring stable 1.8V regulation without external component drift or tolerance effects. The LT1765EFE-1.8#TRPBF datasheet specifies this performance under all operating conditions including varying load and input voltage.
Can the LT1765EFE-1.8#TRPBF operate from a 3.3V input to deliver 1.8V at 3A?
Yes, the LT1765EFE-1.8#TRPBF supports input voltages as low as 3V and can deliver 3A continuously at 1.8V output when VIN ≥ 3.6V. At VIN = 3.3V, maximum output current is reduced due to duty cycle limitation and switch voltage drop - typical performance shows ~2.2A at 3.3V input. The LT1765EFE-1.8#TRPBF maintains constant switch current rating across all duty cycles, but thermal limits and dropout margin constrain low-VIN capability.
Does the LT1765EFE-1.8#TRPBF require an external catch diode, and what are the key selection criteria?
Yes, the LT1765EFE-1.8#TRPBF requires an external Schottky catch diode connected between VSW and GND. Key selection criteria include: reverse voltage rating ≥ VIN(max) = 25V, forward voltage < 0.8V to avoid degrading switch saturation, and average current rating ≥ 2.5A (calculated as IOUT × (VIN − VOUT)/VIN). Recommended parts include CMDSH-3 (3A, 30V, 0.45V VF) or similar low-VF, low-ESR devices. The LT1765EFE-1.8#TRPBF datasheet specifies this requirement in the BOOST and VSW pin descriptions.
How does the SYNC pin function on the LT1765EFE-1.8#TRPBF, and what is its valid input frequency range?
The SYNC pin on the LT1765EFE-1.8#TRPBF accepts a logic-level square wave to synchronize the internal 1.25MHz oscillator. Valid input frequency is 1.6MHz to 2MHz, with 20–80% duty cycle. The pin has a 1.5–2.2V threshold and 20kΩ input resistance. When unused, SYNC must be grounded. This feature eliminates beat frequencies in multi-rail systems and is fully documented in the LT1765EFE-1.8#TRPBF Applications Information section.
What thermal design practices are recommended for the LT1765EFE-1.8#TRPBF in high-current operation?
For reliable 3A operation, the LT1765EFE-1.8#TRPBF requires soldering the exposed GND pad (Pin 17) to a minimum 200mm² copper area on the PCB, with ≥4 thermal vias (0.3mm diameter) connecting to an internal ground plane. Layout must minimize trace length between VIN/VSW pins and their respective capacitors/diode. The LT1765EFE-1.8#TRPBF thermal data specifies θJC(PAD) = 10°C/W - achieving this requires strict adherence to the recommended land pattern and copper fill, as detailed in the LT1765EFE-1.8#TRPBF datasheet Layout Considerations section.
LT1765EFE-1.8#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):
- 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#TRPBF FAQ
1.How can I place an order for LT1765EFE-1.8#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT1765EFE-1.8#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-1.8#TRPBF reliable?
The price and inventory of LT1765EFE-1.8#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-1.8#TRPBF is usually 5 days.
3.What payment methods are accepted for LT1765EFE-1.8#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT1765EFE-1.8#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT1765EFE-1.8#TRPBF?
LT1765EFE-1.8#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT1765EFE-1.8#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-1.8#TRPBF?
For technical support, including LT1765EFE-1.8#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT1765EFE-1.8#TRPBF requirements.
6.How does Aetrix verify that LT1765EFE-1.8#TRPBF is sourced from the original manufacturer or authorized distributors?
All LT1765EFE-1.8#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-1.8#TRPBF meets industry standards.
7.What is the process for return or replacement of LT1765EFE-1.8#TRPBF?
All LT1765EFE-1.8#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LT1765EFE-1.8#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-1.8#TRPBF part is unused and in its original packaging.
Return procedure for LT1765EFE-1.8#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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