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Analog Devices Inc. LTC3561AEDD#PBF
- Part No.:
- LTC3561AEDD#PBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 8-WFDFN Exposed Pad
- Datasheet:
-
LTC3561AEDD#PBF.pdf
- Description:
- IC REG BUCK ADJ 1A 8DFN
- Quantity:
- Payment:
- Shipping:
Inventory:1,386
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Product details
Overview
LTC3561AEDD#PBF from Analog Devices (formerly Linear Technology) is a constant-frequency, current-mode synchronous step-down DC/DC converter optimized for medium-power portable applications. It operates from 2.5V to 5.5V input, delivers up to 1A output current, supports user-configurable switching frequency up to 4MHz, and regulates output voltage from 0.8V to 5.5V using an external resistive divider. Its integrated 0.15Ω P-channel and 0.13Ω N-channel MOSFETs enable high-efficiency power conversion in space-constrained devices such as digital cameras and handheld instruments.
For engineers reviewing the LTC3561AEDD#PBF datasheet, LTC3561AEDD#PBF pinout, LTC3561AEDD#PBF application, or LTC3561AEDD#PBF equivalent, key selection considerations include its 8-lead 3mm × 3mm DFN package, 0.8V feedback reference, 330µA quiescent current, <1µA shutdown current, and OPTI-LOOP® compensation architecture enabling stable operation with ceramic output capacitors.
Technical Context
The LTC3561AEDD#PBF employs a current-mode control architecture with external compensation via the ITH pin, allowing transient response optimization across diverse load and output capacitor conditions. Its dual-purpose SHDN/RT pin sets oscillator frequency (via external resistor) and enables logic-controlled shutdown - pulling SHDN/RT to SVIN forces full shutdown with <1µA supply current.
During dropout, the device sustains regulation by operating the P-channel MOSFET at 100% duty cycle; undervoltage lockout activates below ~2.1V VIN to prevent unstable operation. The internal 0.8V reference exhibits ±0.016V tolerance over temperature, and the error amplifier transconductance is 300µS, supporting robust loop stability with standard Type II/III compensation networks.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 2.5V to 5.5V - supports single-cell Li-ion, Li-polymer, and multi-cell alkaline/NiMH battery inputs without pre-regulation. |
| Output Current | Up to 1A continuous - sufficient for core logic rails in portable processors and imaging subsystems. |
| Switching Frequency | Up to 4MHz - enables use of sub-2mm-height inductors (e.g., 1.0–2.2µH) and compact 10–22µF ceramic output capacitors. |
| Feedback Reference | 0.8V ±2% - sets precise output voltage via external resistor divider; low reference minimizes divider current loss. |
| Quiescent Current | 330µA - maintains high light-load efficiency in always-on subsystems like real-time clocks or sensor interfaces. |
| Shutdown Current | <1µA - preserves battery charge during extended sleep or standby modes. |
| Top/Bottom RDS(ON) | 0.15Ω / 0.13Ω - reduces conduction losses and thermal rise at full load, enabling >96% peak efficiency. |
Pinout & Package
Package: 8-lead 3mm × 3mm plastic DFN with exposed PGND pad (Pin 9), rated for –40°C to 125°C junction temperature. Requires soldering of exposed pad to PCB ground plane for thermal and electrical performance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| SHDN/RT (Pin 1) | Combined shutdown control and oscillator timing input | Connect external resistor to ground to set fOSC; pull to SVIN to disable regulator and reduce IQ to <1µA. |
| SGND (Pin 2) | Signal ground reference | Must be tied to PGND via low-impedance copper; separates analog feedback path from high-current return paths. |
| SW (Pin 3) | Switch node connection | Drives external inductor; swings from PVIN to PGND; requires tight layout to minimize EMI and ringing. |
| PGND (Pin 4 + Exposed Pad) | Main power ground | Return path for input/output capacitors and MOSFETs; exposed pad must be soldered to PCB ground for thermal dissipation and noise reduction. |
| PVIN (Pin 5) | Main power input | High-current input supply rail; requires local 10µF ceramic decoupling to PGND. |
| SVIN (Pin 6) | Signal power supply | Bias source for internal circuitry; must be ≥ PVIN and decoupled to SGND with low-ESR capacitor. |
| VFB (Pin 7) | Feedback input | Compares divided output voltage against 0.8V reference; high-impedance input (±0.1µA) minimizes divider power loss. |
| ITH (Pin 8) | Error amplifier output & compensation node | Provides access to control loop dynamics; used for OPTI-LOOP® compensation and closed-loop transient analysis. |
Key Features
| Feature | Design Value |
|---|---|
| OPTI-LOOP® Compensation | External ITH pin enables tuning of loop bandwidth and phase margin for optimal transient response with varied COUT types and values. |
| 100% Duty Cycle Dropout | P-channel MOSFET remains fully on when VIN ≤ VOUT + ILOAD × RDS(ON), maintaining regulation down to ~2.1V input. |
| Ceramic Capacitor Stability | Internally compensated for stable operation with low-ESR ceramic output capacitors - eliminates need for tantalum or polymer alternatives. |
| Short-Circuit Protection | Peak current limit (1.3–2.5A) and cycle-by-cycle current sensing prevent damage during output faults or startup into heavy loads. |
| Low-Ripple, High-Frequency Operation | 4MHz max switching enables <100mV p-p output ripple with 10µF COUT and 2.2µH L, reducing filtering component count and board area. |
Applications
| Digital Camera Power Rail | Cellular Phone Baseband Core |
|---|---|
Use Scenario: Powers image sensor interface and ISP core requiring clean, dynamically adjustable 1.2V–1.8V at up to 1A. IC Role / Device Role / Timing Role: Primary synchronous buck regulator delivering regulated core voltage with fast load-step response. Use Value: 4MHz operation allows ultra-compact 2.2µH inductor and 10µF ceramic output capacitor, minimizing solution footprint while maintaining <50mV droop under 1A load steps. |
Use Scenario: Supplies baseband processor core voltage (1.0V–1.3V) in LTE smartphones with aggressive power gating and burst-mode operation. IC Role / Device Role / Timing Role: High-efficiency step-down converter with <1µA shutdown current and 330µA quiescent current for extended standby life. Use Value: 0.8V reference and precision line/load regulation (<0.2%) ensure stable core voltage across battery discharge (3.6V → 2.8V) and CPU load transients. |
| Notebook Computer I/O Rail | Handheld Instrument ADC Supply |
Use Scenario: Generates 3.3V I/O rail for USB controllers and display interfaces in ultraportable notebooks. IC Role / Device Role / Timing Role: Compact, thermally efficient buck converter operating from shared 5V system rail. Use Value: 3mm × 3mm DFN package with exposed PGND pad achieves <43°C/W θJA, enabling 1A output without heatsinking in confined chassis spaces. |
Use Scenario: Provides low-noise 2.5V analog supply for 16-bit SAR ADCs in battery-powered test equipment. IC Role / Device Role / Timing Role: Low-quiescent-current DC/DC regulator with tight output voltage accuracy and minimal switching noise coupling. Use Value: 0.15Ω/0.13Ω MOSFETs and current-mode control yield <0.2% load regulation and <100µV RMS output ripple, preserving ADC SNR. |
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 | Fixed 3.3V output; 3.6V–17V input; 3MHz max fSW; 0.11Ω/0.10Ω RDS(ON) | Not adjustable - requires redesign if output voltage differs from 3.3V; higher input range suits industrial 12V systems. | Select when fixed 3.3V output suffices and higher input voltage tolerance is needed; verify thermal performance at 1A in 3mm × 3mm QFN. |
| MP2143GJ-Z | Adjustable 0.8V–6V output; 2.5V–6V input; 2MHz max fSW; 0.12Ω/0.10Ω RDS(ON); no ITH pin | Lacks external compensation node - less flexible transient tuning; lower max frequency increases inductor size. | Choose for cost-sensitive designs where 2MHz operation and simplified compensation are acceptable trade-offs for reduced BOM count. |
Compared with TPS62130ARGTR and MP2143GJ-Z, the LTC3561AEDD#PBF offers superior design flexibility via its adjustable output, 4MHz capability, and OPTI-LOOP® ITH pin - critical for optimizing response in battery-powered systems with variable load profiles and ceramic capacitor constraints.
Availability
LTC3561AEDD#PBF is available at Aetrix Electronics and suitable for digital camera power rails, cellular phone baseband cores, and notebook computer I/O supplies requiring stable component supply, long-term lifecycle support, and guaranteed parametric performance across –40°C to 125°C.
Supply support for LTC3561AEDD#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, Inc. (acquired Linear Technology in 2017) is a global leader in high-performance analog, mixed-signal, and power management semiconductors, serving precision instrumentation, communications, and industrial markets.
The LTC3561AEDD#PBF belongs to Linear's µPower synchronous buck converter family, designed specifically for space- and efficiency-critical portable electronics where small inductors, ceramic capacitors, and ultra-low quiescent current are mandatory.
FAQ
What is the maximum supported switching frequency for the LTC3561AEDD#PBF?
The LTC3561AEDD#PBF supports a user-configurable switching frequency up to 4MHz, achieved by selecting an appropriate RT resistor (e.g., ~125kΩ yields ~2.5MHz). While 4MHz operation is guaranteed by design, it is subject to duty cycle limitations per the datasheet equation fO(MAX) ≈ 6.67 × VOUT/VIN(MAX). At 4MHz, the device enables use of 1.0µH inductors and 10µF ceramic output capacitors, significantly reducing solution size.
How does the LTC3561AEDD#PBF achieve stable operation with ceramic output capacitors?
The LTC3561AEDD#PBF achieves ceramic-capacitor stability through its current-mode architecture and internal compensation design, which avoids reliance on ESR-based zero generation. Its OPTI-LOOP® architecture provides direct access to the error amplifier output (ITH pin), allowing external RC networks to tailor phase margin and bandwidth - eliminating the need for higher-ESR tantalum or polymer capacitors typically required by voltage-mode regulators.
What is the function of the ITH pin on the LTC3561AEDD#PBF?
The ITH pin on the LTC3561AEDD#PBF serves as the error amplifier output and primary compensation node. It sets the peak inductor current threshold and provides direct access to the control loop dynamics. Engineers use it to implement Type II or Type III compensation networks, optimize transient response for specific output capacitors, and perform closed-loop stability analysis - making it essential for fine-tuning performance in production designs.
Does the LTC3561AEDD#PBF support 100% duty cycle operation, and how is it implemented?
Yes, the LTC3561AEDD#PBF supports 100% duty cycle operation in dropout mode. When input voltage drops near the regulated output voltage, the internal P-channel MOSFET remains continuously on, passing current directly from PVIN to the inductor with only RDS(ON) (0.15Ω) causing voltage drop. This maintains regulation without requiring external components, extending usable battery life in low-VIN conditions typical of single-cell Li-ion discharge curves.
What are the thermal requirements for reliable 1A operation of the LTC3561AEDD#PBF?
For reliable 1A continuous operation, the LTC3561AEDD#PBF requires proper PCB thermal design: the exposed PGND pad (Pin 9) must be soldered to a minimum 100mm² copper pour connected to internal/external ground planes. With θJA = 43°C/W and typical 96% efficiency at 3.6V→1.8V/1A, power dissipation is ~72mW - resulting in ~3°C junction-to-ambient rise. No heatsink is needed if PCB layout follows Linear's recommended thermal pad guidelines.
LTC3561AEDD#PBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 8-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):
- 0.8V
- Voltage - Output (Max):
- 5V
- Current - Output:
- 1A
- Frequency - Switching:
- 2.5MHz
- Synchronous Rectifier:
- Yes
- Operating Temperature:
- -40°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-DFN (3x3)
LTC3561AEDD#PBF FAQ
1.How can I place an order for LTC3561AEDD#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3561AEDD#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 LTC3561AEDD#PBF reliable?
The price and inventory of LTC3561AEDD#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3561AEDD#PBF is usually 5 days.
3.What payment methods are accepted for LTC3561AEDD#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3561AEDD#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3561AEDD#PBF?
LTC3561AEDD#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3561AEDD#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 LTC3561AEDD#PBF?
For technical support, including LTC3561AEDD#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3561AEDD#PBF requirements.
6.How does Aetrix verify that LTC3561AEDD#PBF is sourced from the original manufacturer or authorized distributors?
All LTC3561AEDD#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 LTC3561AEDD#PBF meets industry standards.
7.What is the process for return or replacement of LTC3561AEDD#PBF?
All LTC3561AEDD#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3561AEDD#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 LTC3561AEDD#PBF part is unused and in its original packaging.
Return procedure for LTC3561AEDD#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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