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Analog Devices Inc. LTC3565EDD#PBF
- Part No.:
- LTC3565EDD#PBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 10-WFDFN Exposed Pad
- Datasheet:
-
LTC3565EDD#PBF.pdf
- Description:
- IC REG BUCK ADJ 1.25A 10DFN
- Quantity:
- Payment:
- Shipping:
Inventory:144
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Product details
Overview
LTC3565EDD#PBF 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#PBF datasheet, LTC3565EDD#PBF pinout, LTC3565EDD#PBF application, or LTC3565EDD#PBF equivalent, this page provides verified technical context, real-world design meaning of key specs, validated pin functions, confirmed alternative parts with documented differences, and supply-chain support for production deployment.
Technical Context
The LTC3565EDD#PBF uses a constant-frequency current-mode architecture with external RT-resistor programmability (up to 4MHz) and SYNC/MODE pin-selectable operating modes: Burst Mode (40µA IQ), pulse-skipping, or forced continuous conduction. Its dual MOSFET power stage includes P-channel high-side and N-channel low-side switches with RDS(ON) of 0.15Ω / 0.13Ω (DD package).
It implements full-cycle soft-start (0.9ms), ±7% PGOOD monitoring with 40µs blanking, and supports pre-biased outputs. The error amplifier (transconductance 300µS) drives the ITH node to regulate peak inductor current, enabling stable ceramic-capacitor-based designs across wide load and input ranges.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 2.5V to 5.5V - supports single-cell Li-ion (3.0–4.2V), USB 5V, and regulated 3.3V rails without external LDO pre-regulation. |
| Output Voltage Range | 0.6V to 5.5V - enables direct core voltage regulation for modern SoCs (e.g., 0.8V–1.2V) and I/O rail generation (1.8V, 3.3V, 5V). |
| Max Output Current | 1.25A - sufficient for powering ARM Cortex-A/M cores, FPGAs, or multi-sensor modules in handheld instruments. |
| Switching Frequency | Up to 4MHz - allows use of sub-2mm-height inductors (e.g., 1.0–2.2µH) and compact 10–22µF ceramic output capacitors. |
| Quiescent Current | 40µA in Burst Mode - extends battery runtime in standby states for cellular phones and digital cameras. |
| Feedback Reference | 0.6V ±2% - enables precise output regulation with standard resistor dividers; low reference minimizes divider current loss. |
| Shutdown Current | <1µA - ensures negligible drain on backup batteries or energy-harvesting storage elements. |
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) | Oscillator timing resistor connection | Programs switching frequency via external resistor (e.g., 125kΩ → 1.5MHz); sets internal ramp current for oscillator. |
| RUN (Pin 2) | Enable/disable control input | Logic-high (>1.5V) enables converter; logic-low (<0.3V) forces shutdown with <1µA IQ; must not be left floating. |
| SYNC/MODE (Pin 3) | Mode selection & external clock sync | Configures operation mode: GND = pulse skip, SVIN = Burst Mode, SVIN/2 = forced continuous; accepts external 0.4–4MHz clock. |
| SW (Pin 4) | Power switch node | Connects to inductor; swings between PVIN and GND; requires low-inductance layout to minimize EMI and voltage spikes. |
| GND (Pins 5 & 11) | Main power and thermal ground | Pins 5 and 11 (exposed pad) must connect to common PCB ground plane; exposed pad is mandatory for thermal performance. |
| PVIN (Pin 6) | Main power input | High-current path for input supply; requires local 0.1–1µF ceramic decoupling capacitor placed adjacent to pin. |
| SVIN (Pin 7) | Signal power supply | Powers internal analog/digital circuitry; must be ≥ PVIN and decoupled separately; noise on SVIN directly impacts regulation accuracy. |
| PGOOD (Pin 8) | Open-drain power-good indicator | Asserts low when VOUT deviates >±7% from target; includes 40µs blanking to reject startup transients and load-step glitches. |
| VFB (Pin 9) | Feedback input | Compares resistive-divider output against 0.6V reference; input bias current ≤50nA minimizes divider error and power loss. |
| ITH (Pin 10) | Error amplifier compensation node | Controls peak inductor current limit; voltage range 0.4–1.4V; external RC network here optimizes transient response and stability. |
Key Features
| Feature | Design Value |
|---|---|
| Burst Mode operation | Reduces no-load IQ to 40µA by intermittently activating switching cycles-critical for >100-hour battery life in always-on sensors. |
| 100% duty-cycle dropout | Enables seamless transition to linear regulation as input drops near output voltage-preserves system uptime during battery sag. |
| Stable with ceramic capacitors | Eliminates need for high-ESR electrolytics; supports compact, low-profile, high-reliability output filtering using X5R/X7R MLCCs. |
| Synchronizable oscillator | Allows alignment of switching frequency to system clock or other converters-reducing beat frequencies and simplifying EMI filtering. |
| Pre-biased output support | Permits safe startup into pre-charged output rails-essential for hot-swap applications and multi-rail power sequencing. |
Applications
| Digital Camera Power Management | Cellular Phone Baseband Supply |
|---|---|
|
Use Scenario: Powers image sensor, ISP, and flash LED driver from single Li-ion cell (3.0–4.2V). IC Role / Device Role / Timing Role: Primary buck regulator delivering 1.2V @ 1.2A to baseband processor with fast load-step response. Use Value: Burst Mode extends standby time; 4MHz operation enables <2mm-height inductor integration in ultra-thin camera modules. |
Use Scenario: Generates 1.8V I/O and 1.0V core voltage for LTE modem and application processor. IC Role / Device Role / Timing Role: Dual-output capable via external feedback networks; supports dynamic voltage scaling during RF transmission bursts. Use Value: Forced continuous mode ensures fixed-frequency ripple for clean RF subsystem power; PGOOD enables safe power sequencing. |
| Notebook Computer Subsystem Rail | Handheld Test Instrument Core Supply |
|
Use Scenario: Supplies 3.3V to USB controller, display interface, and touch controller in clamshell notebook designs. IC Role / Device Role / Timing Role: Secondary buck converter stepping down main 5V rail; synchronized to system clock to avoid interference with high-speed data lines. Use Value: Low RDS(ON) (0.15Ω/0.13Ω) minimizes thermal rise in confined chassis; 10-lead DFN eases routing in dense BGA escape zones. |
Use Scenario: Provides precision 2.5V analog supply for ADC/DAC and microcontroller in portable multimeters or spectrum analyzers. IC Role / Device Role / Timing Role: Low-noise, low-ripple regulator with pulse-skip mode for reduced EMI in sensitive measurement front-ends. Use Value: ±7% PGOOD threshold ensures reliable fault detection before analog signal corruption occurs; SVIN/PVIN separation isolates noise-sensitive analog circuitry. |
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 | 3.0–17V input, 3A output, fixed 3.3V/5V options; no Burst Mode; higher IQ (18µA typical active) | Requires external feedback for adjustable VOUT; less suitable for sub-3V inputs or ultra-low-IQ battery standby | Choose for higher input voltage tolerance and higher current; avoid when 2.5V start-up or 40µA Burst Mode is required. |
| MAX17503GCU+T | 4.5–60V input, 2.5A output, integrated compensation; no PGOOD; wider temp grade only | Designed for industrial/high-voltage DC-DC; lacks pre-bias support and 0.6V reference flexibility | Choose for 24V bus or PoE-powered systems; avoid for portable Li-ion applications due to minimum 4.5V VIN. |
Compared with TPS62130ARGTR and MAX17503GCU+T, the LTC3565EDD#PBF uniquely combines 2.5V start-up, 40µA Burst Mode, 0.6V reference, and 4MHz capability in a 3mm × 3mm DFN-making it optimal for space-constrained, battery-critical portable designs where efficiency at light loads and small magnetics are essential.
Availability
LTC3565EDD#PBF is available at Aetrix Electronics and suitable for digital cameras, cellular phones, and handheld instruments requiring stable component supply, long-term lifecycle assurance, and consistent parametric performance across temperature.
Supply support for LTC3565EDD#PBF 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 full product support, datasheets, and application engineering for legacy Linear parts including the LTC3565 series.
The LTC3565 belongs to Linear's high-frequency monolithic buck converter family, designed specifically for portable, battery-powered applications demanding compact size, high efficiency at light loads, and robust transient response in space-constrained layouts.
FAQ
What is the absolute maximum input voltage rating for the LTC3565EDD#PBF?
The LTC3565EDD#PBF has an absolute maximum PVIN and SVIN rating of –0.3V to 6V. Exceeding 6V may cause permanent damage. The recommended operating range remains 2.5V to 5.5V per specifications, with undervoltage lockout engaging below ~1.9V to prevent unstable operation. Always observe these limits during hot-swap or load-dump events.
Does the LTC3565EDD#PBF support synchronization to an external clock source?
Yes, the LTC3565EDD#PBF supports external clock synchronization via the SYNC/MODE pin (Pin 3), accepting input frequencies from 0.4MHz to 4MHz. When synchronized, the device operates in pulse-skip mode. This capability allows noise reduction through frequency alignment with system clocks or other converters-critical in RF-sensitive applications like cellular modems.
Can the LTC3565EDD#PBF safely start up into a pre-biased output voltage?
Yes, the LTC3565EDD#PBF explicitly supports pre-biased output startup. Its control architecture prevents reverse current flow during start-up, allowing safe operation when VOUT is already charged (e.g., from another rail or hold-up capacitor). This feature is confirmed in the datasheet's "Start-Up from Shutdown with a Prebiased Output" waveform (Figure G22) and enables robust power sequencing in multi-rail systems.
What is the purpose of separate PVIN and SVIN pins on the LTC3565EDD#PBF?
The LTC3565EDD#PBF uses separate PVIN (Pin 6) and SVIN (Pin 7) supplies to isolate high-current power switching noise from sensitive analog circuitry. PVIN feeds the power switches; SVIN powers the error amplifier, reference, and logic. Keeping them independently decoupled reduces regulation error and improves PSRR-especially critical when powering noise-sensitive analog loads like ADCs or RF synthesizers.
How does the PGOOD pin on the LTC3565EDD#PBF behave during startup and fault conditions?
The PGOOD pin on the LTC3565EDD#PBF is an open-drain output that pulls low when VOUT deviates more than ±7% from its regulated value. It includes 40µs blanking after startup to ignore initial transients and 105µs unblinking delay before releasing, preventing false trips during load steps. This behavior is fully characterized in the Electrical Characteristics table and Typical Performance Graph G04.
LTC3565EDD#PBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 10-WFDFN Exposed Pad
- Packaging:
- Tube
- 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#PBF FAQ
1.How can I place an order for LTC3565EDD#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3565EDD#PBF 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#PBF reliable?
The price and inventory of LTC3565EDD#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3565EDD#PBF is usually 5 days.
3.What payment methods are accepted for LTC3565EDD#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3565EDD#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3565EDD#PBF?
LTC3565EDD#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3565EDD#PBF 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#PBF?
For technical support, including LTC3565EDD#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3565EDD#PBF requirements.
6.How does Aetrix verify that LTC3565EDD#PBF is sourced from the original manufacturer or authorized distributors?
All LTC3565EDD#PBF 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#PBF meets industry standards.
7.What is the process for return or replacement of LTC3565EDD#PBF?
All LTC3565EDD#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3565EDD#PBF, 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#PBF part is unused and in its original packaging.
Return procedure for LTC3565EDD#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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