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Analog Devices Inc. LTC3565IDD#TRPBF
- Part No.:
- LTC3565IDD#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 10-WFDFN Exposed Pad
- Datasheet:
-
LTC3565IDD#TRPBF.pdf
- Description:
- IC REG BUCK ADJ 1.25A 10DFN
- Quantity:
- Payment:
- Shipping:
Inventory:3,537
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Product details
Overview
LTC3565IDD#TRPBF from Analog Devices (formerly Linear Technology) is a 1.25A, 4MHz synchronous step-down DC/DC converter designed for medium-power portable applications. It operates from 2.5V to 5.5V input, delivers adjustable output from 0.6V to 5.5V, and features internal 0.15Ω P-channel and 0.13Ω N-channel MOSFETs. Its current-mode architecture supports external compensation for transient optimization in notebook computers and digital cameras.
For engineers reviewing the LTC3565IDD#TRPBF datasheet, LTC3565IDD#TRPBF pinout, LTC3565IDD#TRPBF application, or LTC3565IDD#TRPBF equivalent, key selection criteria include its 4MHz max switching frequency enabling sub-1mm-height magnetics, Burst Mode® operation with 40µA quiescent current, and support for pre-biased outputs - all within a thermally enhanced 10-lead 3mm × 3mm DFN package.
Technical Context
The LTC3565IDD#TRPBF implements a constant-frequency current-mode control architecture with user-programmable oscillator frequency (via RT pin) up to 4MHz and external synchronization capability on the SYNC/MODE pin. Its dual-supply design separates PVIN (power path) from SVIN (signal logic), requiring SVIN ≥ PVIN.
It integrates peak-current limiting (1.5–2.5A), ±7% PGOOD monitoring with 40µs blanking, and low-dropout 100% duty-cycle operation. The ITH pin serves as the error amplifier output and current comparator threshold control point, enabling precise loop compensation and load transient response tuning across ceramic-capacitor-based output stages.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 2.5V to 5.5V - supports single-cell Li-ion, Li-polymer, and USB-powered systems without external LDO pre-regulation. |
| Output Current | 1.25A continuous - sufficient for core logic rails in handheld instruments and camera image sensors. |
| Switching Frequency | Up to 4MHz - enables use of 1.0–2.2µH inductors ≤1mm height and compact ceramic input/output capacitors. |
| Feedback Reference | 0.6V ±2% - allows precise output regulation down to 0.6V for low-voltage ASIC/FPGA cores. |
| Quiescent Current | 40µA in Burst Mode - extends battery runtime in standby states of cellular phones and IoT edge nodes. |
| Shutdown Current | <1µA - ensures negligible drain during system-level power-off in always-on sensor modules. |
| Efficiency | Up to 95% at 1.25A - achieved via low RDS(ON) internal switches (0.15Ω high-side, 0.13Ω low-side) and synchronous rectification. |
Pinout & Package
Package: 10-lead (3mm × 3mm) plastic DFN with exposed thermal pad (Pin 11 = GND). Requires soldering of exposed pad to PCB ground plane for thermal performance (θJA = 43°C/W).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| RT (Pin 1) | Oscillator timing resistor node | Connects to ground to set switching frequency; 125kΩ yields ~1.5MHz; supports up to 4MHz operation. |
| RUN (Pin 2) | Enable/disable control input | High >1.5V enables converter; low <0.3V forces shutdown with <1µA supply current. |
| SYNC/MODE (Pin 3) | Mode selection & external clock sync | Ground = pulse skip; SVIN = Burst Mode; SVIN/2 = forced continuous; external clock input enables synchronization. |
| SW (Pin 4) | Power switch node | Connects to inductor; swings between PVIN and GND; requires low-inductance layout to minimize ringing. |
| GND (Pins 5 & 11) | Main power and thermal ground | Pins 5 and 11 (exposed pad) must be tied to common PCB ground plane for EMI control and thermal dissipation. |
| PVIN (Pin 6) | Main power input | Supplies high-current path to P-channel MOSFET; requires local 0.1–1µF ceramic decoupling to GND. |
| SVIN (Pin 7) | Signal power supply | Powers internal logic and error amplifier; must be ≥ PVIN and independently decoupled. |
| PGOOD (Pin 8) | Open-drain power-good indicator | Pulls low when VOUT deviates >±7% from regulation; includes 40µs blanking to reject startup transients. |
| VFB (Pin 9) | Feedback voltage input | Compares resistive divider output against 0.6V reference; sets regulated output voltage (VOUT = 0.6V × (1 + R1/R2)). |
| ITH (Pin 10) | Error amplifier output / current limit control | Controls peak inductor current; nominal range 0.4V–1.4V; used for loop compensation and transient response tuning. |
Key Features
| Feature | Design Value |
|---|---|
| Burst Mode® operation | Reduces IQ to 40µA at light loads by intermittently activating switching cycles - critical for battery life in standby mode. |
| 100% duty-cycle dropout | Enables regulation down to VOUT ≈ VIN − ILOAD×RDS(ON) - maintains output during brownout conditions in portable systems. |
| Stable with ceramic capacitors | Eliminates need for high-ESR electrolytics; supports compact, low-profile designs using X5R/X7R MLCCs on input and output. |
| Synchronizable oscillator | Allows alignment of switching frequency to system clock or other converters - reduces beat frequencies and EMI peaks. |
| Pre-biased output support | Starts up safely into an already charged output rail - prevents reverse current flow in multi-rail power sequencing scenarios. |
Applications
| Portable Computing Power | Digital Imaging Core Supply |
|---|---|
|
Use Scenario: Powering CPU I/O, memory interface, or display controller in ultra-thin notebooks and tablets. IC Role / Device Role / Timing Role: Primary step-down regulator delivering 1.2V/1.8V/3.3V from single-cell Li-ion battery. Use Value: 4MHz operation enables 2.2µH inductor ≤1mm height, reducing board area and profile while maintaining >90% efficiency at 1A. |
Use Scenario: Supplying image signal processor (ISP) and CMOS sensor analog/digital rails in DSLR and mirrorless cameras. IC Role / Device Role / Timing Role: High-transient-response buck converter handling bursty sensor readout currents up to 1.25A. Use Value: Current-mode control and external compensation allow optimized response to 100mA–1.25A load steps without output overshoot. |
| Cellular Baseband Power | Handheld Test Instrumentation |
|
Use Scenario: Generating clean 1.1V core voltage for LTE/5G baseband processors in smartphones and hotspots. IC Role / Device Role / Timing Role: Low-noise, forced-continuous-mode DC/DC converter synchronized to system clock to avoid RF interference. Use Value: SYNC/MODE pin configuration enables fixed-frequency operation for predictable EMI filtering and reduced conducted noise. |
Use Scenario: Providing stable 3.3V or 5V rail for microcontroller, ADC, and communication interfaces in portable multimeters and oscilloscopes. IC Role / Device Role / Timing Role: Highly integrated buck converter eliminating external MOSFETs and gate drivers in space-constrained enclosures. Use Value: Integrated 0.15Ω/0.13Ω switches and 10-lead DFN package reduce BOM count and thermal resistance vs discrete solutions. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar synchronous step-down converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS62130ARGTR | 3.6V–17V input, 3A output, fixed 3.3V/5V options; no adjustable VFB; lower max frequency (2.5MHz). | Better suited for higher-input industrial rails; lacks Burst Mode and pre-bias support. | Select when input exceeds 5.5V or higher output current is required; not drop-in for battery-powered 2.5–5.5V systems. |
| MAX17503ATJ+ | 4.5V–60V input, 2.5A output, integrated compensation; wider temp range (–40°C to +125°C); no Burst Mode. | Targeted at automotive and industrial DC inputs; higher minimum VIN limits use in Li-ion systems. | Choose for high-VIN industrial power supplies; unsuitable for single-cell battery applications due to 4.5V UVLO. |
Compared with TPS62130ARGTR and MAX17503ATJ+, the LTC3565IDD#TRPBF uniquely combines 2.5V min VIN, 4MHz switching, Burst Mode IQ, and pre-biased startup - making it optimal for compact, battery-critical portable electronics where size, efficiency, and sequencing robustness are prioritized over wide-input flexibility.
Availability
LTC3565IDD#TRPBF is available at Aetrix Electronics and suitable for notebook computers, digital cameras, and cellular phones requiring stable component supply with full production traceability and long-term lifecycle support.
Supply support for LTC3565IDD#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 LTC3565IDD#TRPBF belongs to Linear's µPower synchronous buck converter family, engineered specifically for space- and efficiency-constrained portable electronics operating from single-cell lithium batteries.
FAQ
What is the maximum supported switching frequency for LTC3565IDD#TRPBF?
The LTC3565IDD#TRPBF supports up to 4MHz switching frequency, programmable via the RT pin resistor or external synchronization on the SYNC/MODE pin. While 4MHz operation is guaranteed by design, production testing is performed at lower frequencies (e.g., 1.5MHz with 125kΩ RT), and duty cycle limitations apply near VIN/VOUT boundaries per the datasheet's fO(MAX) ≈ 6.67 × VOUT/VIN(MAX) equation.
Does LTC3565IDD#TRPBF support powering into a pre-charged output capacitor?
Yes, the LTC3565IDD#TRPBF explicitly supports pre-biased output startup. Its control architecture prevents reverse current flow during start-up into an already charged rail, making it suitable for systems with complex power sequencing requirements such as multi-rail FPGAs or processors with independent domain power-up sequences.
What are the thermal considerations for LTC3565IDD#TRPBF in its DFN package?
The LTC3565IDD#TRPBF uses a 10-lead 3mm × 3mm DFN with exposed thermal pad (Pin 11 = GND). For reliable operation at 1.25A, the exposed pad must be soldered to a minimum 100mm² copper pour on the PCB. Thermal resistance is θJA = 43°C/W; junction temperature must remain ≤125°C under worst-case ambient and power dissipation conditions.
How does the SYNC/MODE pin configure operational modes on LTC3565IDD#TRPBF?
The SYNC/MODE pin on LTC3565IDD#TRPBF selects three modes: grounded → pulse skip; tied to SVIN → Burst Mode® (40µA IQ); biased at SVIN/2 → forced continuous conduction. It also accepts external clock signals (0.4–4MHz) for synchronization, enabling EMI reduction in multi-converter systems.
Can LTC3565IDD#TRPBF operate with only ceramic capacitors on input and output?
Yes, the LTC3565IDD#TRPBF is fully stable with ceramic capacitors on both input and output. Its current-mode architecture and internal compensation eliminate the need for high-ESR electrolytic or tantalum capacitors, allowing compact, low-profile designs using X5R/X7R MLCCs - a key enabler for modern portable electronics.
LTC3565IDD#TRPBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 10-WFDFN 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):
- 2.5V
- Voltage - Input (Max):
- 5.5V
- Voltage - Output (Min/Fixed):
- 0.6V
- Voltage - Output (Max):
- 5.5V
- Current - Output:
- 1.25A
- Frequency - Switching:
- Up to 4MHz
- Synchronous Rectifier:
- Yes
- Operating Temperature:
- -40°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 10-DFN (3x3)
LTC3565IDD#TRPBF FAQ
1.How can I place an order for LTC3565IDD#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3565IDD#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 LTC3565IDD#TRPBF reliable?
The price and inventory of LTC3565IDD#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3565IDD#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC3565IDD#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3565IDD#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3565IDD#TRPBF?
LTC3565IDD#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3565IDD#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 LTC3565IDD#TRPBF?
For technical support, including LTC3565IDD#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3565IDD#TRPBF requirements.
6.How does Aetrix verify that LTC3565IDD#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC3565IDD#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 LTC3565IDD#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC3565IDD#TRPBF?
All LTC3565IDD#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3565IDD#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 LTC3565IDD#TRPBF part is unused and in its original packaging.
Return procedure for LTC3565IDD#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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