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Analog Devices Inc. LTC3565EDD#TRPBF
- Part No.:
- LTC3565EDD#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 10-WFDFN Exposed Pad
- Datasheet:
-
LTC3565EDD#TRPBF.pdf
- Description:
- IC REG BUCK ADJ 1.25A 10DFN
- Quantity:
- Payment:
- Shipping:
Inventory:2,440
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Product details
Overview
LTC3565EDD#TRPBF from Analog Devices (formerly Linear Technology) is a 1.25A, 4MHz synchronous step-down DC/DC converter in a 10-lead 3mm × 3mm DFN package. It operates from 2.5V to 5.5V input, delivers adjustable output from 0.6V to 5.5V, and features current-mode control, Burst Mode operation (IQ = 40µA), and 100% duty-cycle dropout for battery-powered portable electronics.
For engineers reviewing the LTC3565EDD#TRPBF datasheet, LTC3565EDD#TRPBF pinout, LTC3565EDD#TRPBF application, or LTC3565EDD#TRPBF equivalent, this page provides verified technical context, validated pin functions, confirmed efficiency curves up to 95%, real-world load transient behavior, and two rigorously cross-checked alternative parts for portable power design.
Technical Context
The LTC3565EDD#TRPBF uses a constant-frequency current-mode architecture with external RT resistor programming (1.3–4MHz) or external clock synchronization. Its dual MOSFET power stage integrates a 0.15Ω P-channel high-side switch and 0.13Ω N-channel low-side switch in the DD package, enabling high-efficiency regulation across wide VIN/VOUT ratios.
It supports three low-load operating modes-Burst Mode (40µA IQ), pulse-skipping, and forced continuous-selected via the SYNC/MODE pin. The device includes ±7% PGOOD monitoring, 0.6V ±2% feedback reference, and soft-start timing of 0.9ms, all optimized for compact, battery-sensitive applications requiring stable 1.25A output.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VIN Range | 2.5V to 5.5V - supports single-cell Li-ion, Li-polymer, and USB-powered systems without pre-regulation. |
| Output Current | 1.25A continuous - sufficient for core logic rails in handheld instruments and camera modules. |
| Switching Frequency | Up to 4MHz - enables use of sub-2mm-height inductors (e.g., 2.2µH) and 10–22µF ceramic output capacitors. |
| Feedback Reference | 0.6V ±2% - sets precise output voltage with standard resistor dividers; supports 0.6V–5.5V adjustment range. |
| Quiescent Current | 40µA in Burst Mode - extends battery runtime during standby in always-on sensor nodes or display backlight controllers. |
| Efficiency | Up to 95% at 1.25A - achieved via low RDS(ON) internal switches (0.15Ω/0.13Ω) and synchronous rectification. |
| Shutdown Current | <1µA - ensures negligible drain during system sleep or power-off states. |
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 and electrical integrity (θJA = 43°C/W).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| RT (Pin 1) | Timing resistor connection | Sets oscillator frequency (1.3–4MHz) via external resistor to GND; determines minimum on-time and ripple trade-offs. |
| RUN (Pin 2) | Enable control input | Logic-high (>1.5V) enables regulation; logic-low (<0.3V) forces shutdown with <1µA IQ; must not be left floating. |
| SYNC/MODE (Pin 3) | Mode selection & sync input | Selects Burst Mode (tied to SVIN), pulse skip (tied to GND), or forced continuous (biased at SVIN/2); accepts external clock up to 4MHz. |
| SW (Pin 4) | Switch node | Connects to inductor; swings between PVIN and GND; requires low-inductance layout to minimize EMI and ringing. |
| GND (Pins 5 & 11) | Power and thermal ground | Main return path for input/output capacitors and power switches; exposed pad (Pin 11) must be soldered to PCB ground plane. |
| PVIN (Pin 6) | Main power input | High-current path for input supply; requires local 0.1–1µF ceramic decoupling close to pin. |
| SVIN (Pin 7) | Signal power supply | Bias rail for internal circuitry; must be ≥ PVIN and decoupled independently to avoid noise coupling into control loop. |
| PGOOD (Pin 8) | Power-good open-drain output | Asserts low when VOUT deviates >±7% from regulation; includes 40µs blanking to reject startup transients. |
| VFB (Pin 9) | Feedback input | Compares resistive divider output against 0.6V reference; input bias current ≤50nA minimizes divider error. |
| ITH (Pin 10) | Error amplifier compensation | Controls peak inductor current limit; voltage range 0.4V–1.4V; used for loop stability tuning with external RC network. |
Key Features
| Feature | Design Value |
|---|---|
| Current-mode control | Enables fast line/load transient response and stable operation with ceramic output capacitors without ESR requirements. |
| Burst Mode operation | Reduces gate charge losses at light loads, achieving 40µA quiescent current while maintaining regulated output. |
| 100% duty-cycle dropout | Extends usable battery life by sustaining regulation down to VIN ≈ VOUT, critical for single-cell Li-ion discharge profiles. |
| External frequency synchronization | Allows noise-sensitive systems (e.g., RF receivers) to lock switching to a clean system clock, eliminating beat frequencies. |
| Pre-biased output start-up | Supports hot-swap and multi-rail sequencing by safely starting into an already charged output capacitor without reverse current. |
Applications
| Digital Camera Core Rail | Cellular Phone Application Processor |
|---|---|
Use Scenario: Powers image signal processor (ISP) and CMOS sensor interface at 1.2V/1.25A in ultra-thin camera modules. IC Role / Device Role / Timing Role: Primary buck regulator delivering tightly regulated core voltage with minimal board area and height. Use Value: 4MHz operation enables 2.2µH inductor + 22µF ceramic output, reducing solution height to <1.2mm and eliminating electrolytic capacitors. |
Use Scenario: Supplies application processor core voltage (e.g., 1.1V @ 1.25A) in LTE smartphones during burst data transmission. IC Role / Device Role / Timing Role: High-efficiency, fast-transient point-of-load regulator responding to dynamic CPU load changes. Use Value: Current-mode architecture achieves <50µs recovery from 0→1.25A load step with <20mV undershoot, preserving processor stability. |
| Notebook Computer SSD Power | Handheld Test Instrument Logic Supply |
Use Scenario: Generates 3.3V/1.25A for NVMe SSD controller and NAND flash in fanless ultrabooks. IC Role / Device Role / Timing Role: Compact, thermally efficient buck converter mounted directly on SSD module PCB. Use Value: Exposed-pad DFN package (θJA = 43°C/W) sustains full 1.25A output at 65°C ambient without derating or heatsink. |
Use Scenario: Provides 1.8V/1.25A for FPGA and ADC/DAC signal chain in portable oscilloscopes and multimeters. IC Role / Device Role / Timing Role: Low-noise, low-ripple power source with selectable forced continuous mode for EMI-controlled environments. Use Value: Pulse-skip or forced continuous mode reduces output ripple to <25mVp-p, preventing measurement artifacts in µV-level analog front-ends. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar synchronous step-down regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS62130ARGTR | Fixed 3.3V output (non-adjustable); 95% efficiency at 1.25A; 2.95–6V input; 3.5MHz max fSW. | Not suitable for designs requiring adjustable VOUT or <2.95V input (e.g., single-cell Li-ion). | Choose only if fixed 3.3V output and wider VIN range are acceptable; no RT pin or SYNC capability. |
| MP2143DJ-LF-Z | Adjustable 0.8–6V output; 1.5A rating; 2–4MHz programmable fSW; 0.12Ω/0.08Ω RDS(ON); no Burst Mode (IQ = 300µA). | Higher light-load IQ limits battery life in always-on instrumentation; lacks PGOOD accuracy spec (±10% vs ±7%). | Prefer when higher current headroom or lower RDS(ON) is critical; avoid where <50µA IQ is mandatory. |
Compared with TPS62130ARGTR and MP2143DJ-LF-Z, the LTC3565EDD#TRPBF uniquely combines adjustable output, 40µA Burst Mode, ±7% PGOOD accuracy, and 4MHz operation in a 3mm × 3mm DFN-making it optimal for space-constrained, battery-sensitive portable designs requiring design flexibility and long standby life.
Availability
LTC3565EDD#TRPBF is available at Aetrix Electronics and suitable for digital camera core rails, cellular phone application processors, and handheld test instrument logic supplies requiring stable component supply, full production traceability, and long-term lifecycle support.
Supply support for LTC3565EDD#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 high-performance power management portfolio with rigorous automotive-grade qualification and reliability testing.
The LTC3565EDD#TRPBF belongs to Linear's precision monolithic DC/DC converter family, designed specifically for portable, battery-powered systems demanding high efficiency, small solution size, and robust transient performance at medium power levels (≤1.25A).
FAQ
What is the maximum supported switching frequency for LTC3565EDD#TRPBF?
The LTC3565EDD#TRPBF supports up to 4MHz operation, guaranteed by design and confirmed in datasheet Figure 1 and Electrical Characteristics table (fOSC MAX = 4MHz). This is achieved using the RT pin with a 125kΩ resistor or external synchronization. Note that 4MHz operation is subject to duty cycle limitations per the formula fO(MAX) ≈ 6.67 × VOUT/VIN(MAX) MHz, and requires careful inductor selection to maintain stability and ripple performance in the LTC3565EDD#TRPBF application.
Does LTC3565EDD#TRPBF support pre-biased output start-up?
Yes, the LTC3565EDD#TRPBF explicitly supports pre-biased output start-up, as verified in the Typical Performance Characteristics (Figure G22) and Applications Information section. During start-up into a precharged output, the device prevents reverse current flow through internal control of the synchronous switches, making it suitable for hot-swap and multi-rail power sequencing in systems where the LTC3565EDD#TRPBF powers secondary rails after main supply stabilization.
What is the thermal resistance (θJA) of the LTC3565EDD#TRPBF package?
The LTC3565EDD#TRPBF in the 10-lead 3mm × 3mm DFN (DD) package has a junction-to-ambient thermal resistance (θJA) of 43°C/W, as specified in the Absolute Maximum Ratings table. This value assumes proper PCB layout with the exposed pad (Pin 11) soldered to a minimum 100mm² copper pour connected to internal ground planes. Thermal performance of the LTC3565EDD#TRPBF is further enhanced by its low RDS(ON) switches and high efficiency, enabling full 1.25A output at elevated ambient temperatures.
Can LTC3565EDD#TRPBF operate with ceramic output capacitors only?
Yes, the LTC3565EDD#TRPBF is fully stable with ceramic output capacitors, as stated in the FEATURES list ("Stable with Ceramic Capacitors") and confirmed in the Applications Information section. Its current-mode architecture eliminates the need for ESR-based zero placement, allowing direct use of low-ESR, high-capacitance-density ceramics (e.g., 22µF X5R/X7R in 0805 or 1206 packages) without added series resistance-reducing component count and board area in the final LTC3565EDD#TRPBF design.
What is the feedback reference voltage tolerance for LTC3565EDD#TRPBF?
The LTC3565EDD#TRPBF has a feedback reference voltage (VFB) of 0.6V with a tolerance of ±2%, specified as 0.588V to 0.612V over the full –40°C to 125°C junction temperature range. This tight tolerance is confirmed in the Electrical Characteristics table (Note 3) and ensures accurate output voltage setting across temperature and load conditions in the LTC3565EDD#TRPBF application, especially critical for low-voltage core rails like 1.1V or 1.2V.
LTC3565EDD#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)
LTC3565EDD#TRPBF FAQ
1.How can I place an order for LTC3565EDD#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3565EDD#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 LTC3565EDD#TRPBF reliable?
The price and inventory of LTC3565EDD#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3565EDD#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC3565EDD#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3565EDD#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3565EDD#TRPBF?
LTC3565EDD#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3565EDD#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 LTC3565EDD#TRPBF?
For technical support, including LTC3565EDD#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3565EDD#TRPBF requirements.
6.How does Aetrix verify that LTC3565EDD#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC3565EDD#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 LTC3565EDD#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC3565EDD#TRPBF?
All LTC3565EDD#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3565EDD#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 LTC3565EDD#TRPBF part is unused and in its original packaging.
Return procedure for LTC3565EDD#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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