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Analog Devices Inc. LT1765ES8#TRPBF
- Part No.:
- LT1765ES8#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
LT1765ES8#TRPBF.pdf
- Description:
- IC REG BUCK ADJ 3A 8SO
- Quantity:
- Payment:
- Shipping:
Inventory:1,073
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Product details
Overview
LT1765ES8#TRPBF from Analog Devices (formerly Linear Technology) is a monolithic 3A, 1.25MHz current-mode step-down switching regulator in an 8-lead SOIC 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 LT1765ES8#TRPBF datasheet, LT1765ES8#TRPBF pinout, LT1765ES8#TRPBF application, or LT1765ES8#TRPBF equivalent, key selection factors include its 1.25MHz constant-frequency operation, 15μA shutdown current, 1.2V feedback reference, thermal-enhanced SOIC-8 package with GND-connected lead frame, and synchronization capability up to 2MHz.
Technical Context
The LT1765ES8#TRPBF implements a constant-frequency, peak-current-mode buck architecture with an internal 1.25MHz oscillator and dual-loop control: voltage error amplifier output sets the per-cycle current limit threshold at the VC pin, while a dedicated current-sense amplifier monitors switch current on every cycle. This enables fast transient response and inherent loop stability without external slope compensation under most conditions.
Its bipolar NPN switch uses BOOST pin-driven gate drive to achieve low 270mV typical on-voltage drop at 3A, requiring an external boost capacitor and diode. The internal 2.6V VIN undervoltage lockout and 1.33V SHDN threshold support reliable startup and battery-protection functions in wide-input industrial and portable applications.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Switching Frequency | 1.25MHz typical; enables use of small chip inductors (e.g., 1.5–4.7μH) and ceramic capacitors, reducing board area vs. lower-frequency regulators. |
| Max Output Current | 3A continuous; maintained across all duty cycles due to constant maximum switch current rating, supporting high-power loads without derating. |
| Input Voltage Range | 3V to 25V; accommodates Li-ion batteries (3.0–4.2V), 5V/12V/24V rails, and regulated wall adapters without external pre-regulation. |
| Feedback Reference | 1.2V nominal; used with external resistor divider for adjustable outputs or internally trimmed for fixed 5V output in LT1765ES8#TRPBF variant. |
| Quiescent Current | 1mA operating / 15μA shutdown; improves light-load efficiency and extends battery life in always-on portable systems. |
| Thermal Resistance | θJA = 90°C/W (SOIC-8); requires PCB copper pour on GND leads and short thermal paths to sustain full 3A load at 125°C junction temperature. |
| Synchronization Range | 1.6MHz to 2MHz; allows EMI reduction via frequency dithering or alignment with system clock domains. |
Pinout & Package
LT1765ES8#TRPBF is housed in an 8-lead plastic SOIC (S8) package with exposed GND lead frame for enhanced thermal performance. Pin 4 is GND and must be connected to a large copper area. Both GND pins (Pin 4 and Pin 5) are internally tied to the die substrate and exposed pad.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (SYNC) | Oscillator synchronization input | Accepts logic-level signal (20–80% duty cycle) to lock internal oscillator between 1.6–2MHz; float or ground when unused. |
| 2 (VC) | Error amplifier output / current limit control | 0.4–0.9V analog control node; sets per-cycle switch current threshold; can be clamped to disable output. |
| 3 (FB) | Feedback input | Connects directly to 5V output (fixed version); senses 1.2V reference to regulate output; <5kΩ impedance required for foldback protection. |
| 4 (SHDN) | Shutdown enable input | 1.33V threshold; pull below 1.27V to enter 15μA shutdown; doubles as accurate UVLO with external resistor divider. |
| 5 (GND) | Power and signal reference | Primary ground return for load, input bypass, and internal circuitry; must be low-impedance path to minimize load regulation error. |
| 6 (BOOST) | Switch driver supply | Drives NPN base above VIN via external capacitor/diode; requires ≥2.7V headroom above SW to maintain saturation and low RCE. |
| 7 (VIN) | Main power input | Supplies internal bias regulator and collector of on-chip NPN switch; place 1–4.7μF ceramic bypass capacitor within 5mm. |
| 8 (SW) | Switch emitter output | Drives inductor; swings from ~0V to VIN during operation; requires external catch diode (VBR < 0.8V) to clamp negative flyback. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated 3A NPN switch | 0.09Ω on-resistance enables >90% efficiency at 3A/5V out from 12V input, eliminating external MOSFET and driver complexity. |
| Current-mode control | Provides inherent cycle-by-cycle overcurrent protection and eliminates need for external slope compensation in most designs. |
| Thermally enhanced SOIC-8 | GND-connected lead frame and Pin 4 thermal pad reduce θJA to 90°C/W, enabling full 3A output without heatsink in compact layouts. |
| 15μA shutdown current | Extends battery runtime in standby mode; supports deep sleep states in portable computing and IoT edge devices. |
| 1.25MHz fixed frequency | Permits use of miniature 1.5–2.2μH shielded inductors and 1–10μF X7R ceramics, cutting solution size by >40% vs. 500kHz alternatives. |
Applications
| Portable Computers | Battery-Powered Systems |
|---|---|
Use Scenario: Core voltage regulation for embedded controllers and peripherals in ultra-thin laptops and tablets. IC Role / Device Role / Timing Role: Primary 5V step-down converter delivering up to 3A continuous current from single-cell Li-ion or USB-C PD input. Use Value: High 1.25MHz switching frequency minimizes inductor size and input/output capacitance, enabling conformal PCB layouts with tight height constraints. | Use Scenario: Power management in handheld test equipment and portable medical monitors requiring long battery life. IC Role / Device Role / Timing Role: Main 5V rail generator with 15μA shutdown and 2.6V UVLO to prevent deep discharge of Li-ion cells. Use Value: 1mA quiescent current and precise 1.33V SHDN threshold enable accurate battery cutoff and >100-hour standby duration. |
| Regulated Wall Adapters | Distributed Power |
Use Scenario: Secondary-side DC/DC stage in universal-input AC/DC adapters powering 5V logic subsystems. IC Role / Device Role / Timing Role: High-efficiency post-regulator accepting 7–24V intermediate bus and delivering tightly regulated 5V/3A output. Use Value: Wide 3V–25V input range and 0.09Ω switch eliminate need for pre-regulator stages, simplifying BOM and improving overall adapter efficiency. | Use Scenario: Point-of-load conversion in industrial PLC backplanes and telecom line cards with 12V/24V distributed buses. IC Role / Device Role / Timing Role: Local 5V supply for FPGAs, ADCs, and interface ICs; synchronized to system clock via SYNC pin to reduce EMI. Use Value: 1.6–2MHz synchronization capability allows noise spectral spreading and avoids sensitive frequency bands in dense multi-rail systems. |
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#TRPBF | 2.25MHz synchronous buck, 2A max, integrated MOSFETs; 2.7–5.5V input only; no BOOST pin. | Targeted at low-input, space-constrained apps (e.g., USB-powered); lacks LT1765ES8#TRPBF's 25V input and 3A capability. | Select LTC3621EDD#TRPBF only for ≤5.5V inputs where board area is critical and 2A suffices. |
| TPS54331DR | 3A synchronous buck, 500kHz, 3.5–28V input; integrated high-side MOSFET; no external BOOST needed. | Lower switching frequency requires larger magnetics; lacks 1.25MHz+ sync range and 15μA shutdown of LT1765ES8#TRPBF. | Choose TPS54331DR for cost-sensitive, thermally relaxed designs where EMI filtering is less critical. |
Compared with LTC3621EDD#TRPBF and TPS54331DR, LT1765ES8#TRPBF uniquely combines 25V input tolerance, 3A bipolar-switch performance, 1.25MHz fixed frequency, and 15μA shutdown-making it optimal for ruggedized portable and industrial 5V point-of-load applications where input voltage range and ultra-low standby power are decisive.
Availability
LT1765ES8#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 RoHS-compliant packaging.
Supply support for LT1765ES8#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 power management ICs with rigorous reliability testing and automotive-grade process controls.
The LT1765 family was designed for high-density, high-efficiency DC/DC conversion in portable and industrial systems where wide input range, low quiescent current, and thermal robustness are essential.
FAQ
What is the output voltage of the LT1765ES8#TRPBF?
The LT1765ES8#TRPBF is the fixed 5V output variant of the LT1765 family. Its internal feedback divider is trimmed to deliver a nominal 5.0V output with ±1% tolerance over temperature and load, referenced to the 1.2V internal bandgap. No external resistors are required-FB pin connects directly to the output.
Can the LT1765ES8#TRPBF synchronize to an external clock?
Yes, the LT1765ES8#TRPBF supports synchronization via its SYNC pin, which accepts logic-level signals with 20–80% duty cycle to lock the internal oscillator between 1.6MHz and 2MHz. This feature enables EMI reduction and timing alignment in multi-rail systems-critical for noise-sensitive applications like data acquisition and communications hardware.
What thermal design considerations apply to the LT1765ES8#TRPBF in SOIC-8?
The LT1765ES8#TRPBF SOIC-8 package relies on Pin 4 (GND) and the internal lead frame for heat dissipation. To maintain ≤125°C junction temperature at 3A, designers must connect Pin 4 to ≥1 cm² copper area using multiple thermal vias, keep high-current traces short, and avoid routing noisy signals near VC/FB pins. θJA is specified at 90°C/W under these conditions.
Does the LT1765ES8#TRPBF require an external catch diode?
Yes, the LT1765ES8#TRPBF uses an NPN bipolar switch and requires an external Schottky catch diode (e.g., CMDSH-3) connected from SW to GND. This diode conducts during switch-off time and must have VBR < 0.8V to clamp negative flyback voltage. Omitting it will cause destructive voltage spikes and device failure.
How does the BOOST pin function in the LT1765ES8#TRPBF?
The BOOST pin supplies elevated drive voltage to the NPN switch base, ensuring saturation and minimizing conduction loss. It is charged via an external capacitor and diode (typically 0.18μF + CMDSH-3) referenced to the output. The LT1765ES8#TRPBF requires ≥2.7V headroom on BOOST above SW to maintain <430mV on-drop at 3A-critical for high-efficiency operation.
LT1765ES8#TRPBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- 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:
- 8-SO
LT1765ES8#TRPBF FAQ
1.How can I place an order for LT1765ES8#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT1765ES8#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 LT1765ES8#TRPBF reliable?
The price and inventory of LT1765ES8#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT1765ES8#TRPBF is usually 5 days.
3.What payment methods are accepted for LT1765ES8#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT1765ES8#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT1765ES8#TRPBF?
LT1765ES8#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT1765ES8#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 LT1765ES8#TRPBF?
For technical support, including LT1765ES8#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT1765ES8#TRPBF requirements.
6.How does Aetrix verify that LT1765ES8#TRPBF is sourced from the original manufacturer or authorized distributors?
All LT1765ES8#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 LT1765ES8#TRPBF meets industry standards.
7.What is the process for return or replacement of LT1765ES8#TRPBF?
All LT1765ES8#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LT1765ES8#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 LT1765ES8#TRPBF part is unused and in its original packaging.
Return procedure for LT1765ES8#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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