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Analog Devices Inc. LTC3561AEDD#TRPBF
- Part No.:
- LTC3561AEDD#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 8-WFDFN Exposed Pad
- Datasheet:
-
LTC3561AEDD#TRPBF.pdf
- Description:
- IC REG BUCK ADJ 1A 8DFN
- Quantity:
- Payment:
- Shipping:
Inventory:4,498
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Product details
Overview
LTC3561AEDD#TRPBF from Analog Devices (formerly Linear Technology) is a 1A, 4MHz synchronous step-down DC/DC converter optimized for space-constrained battery-powered systems. It operates from 2.5V to 5.5V input, delivers adjustable output from 0.8V to 5.5V, features internal 0.15Ω P-channel and 0.13Ω N-channel MOSFETs, and uses current-mode control with external compensation for transient optimization in portable instrumentation and handheld devices.
For engineers reviewing the LTC3561AEDD#TRPBF datasheet, LTC3561AEDD#TRPBF pinout, LTC3561AEDD#TRPBF application, or LTC3561AEDD#TRPBF equivalent, key selection considerations include its 8-lead 3mm × 3mm DFN package, 2.5–4MHz programmable switching frequency via RT resistor, 330µA quiescent current, 100% duty-cycle dropout operation, and compatibility with ceramic output capacitors down to 10µF.
Technical Context
The LTC3561AEDD#TRPBF implements a constant-frequency current-mode architecture with dual internal MOSFETs: a 0.15Ω P-channel high-side switch and 0.13Ω N-channel low-side switch. Its error amplifier drives the ITH pin to regulate peak inductor current, enabling fast load transient response across wide output capacitance ranges.
Operation includes programmable oscillator frequency (2.25–4MHz) set by an external RT resistor, shutdown activation by pulling SHDN/RT to SVIN, and dropout mode where the P-channel MOSFET remains fully on at 100% duty cycle. The device integrates undervoltage lockout (2.1V threshold) and thermal protection, with guaranteed performance over –40°C to 125°C junction temperature.
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 Voltage Range | 0.8V to 5.5V - adjustable via external resistive divider; 0.8V feedback reference enables low-voltage core rail generation. |
| Max Output Current | 1A continuous - limited by internal MOSFET RDS(ON) and thermal design; peak switch current limit is 1.3–2.5A. |
| Switching Frequency | 2.25–4MHz - programmable via RT resistor; enables use of sub-2mm-height inductors and compact ceramic capacitors. |
| Quiescent Current | 330µA - ensures minimal battery drain during active light-load operation in always-on subsystems. |
| Shutdown Current | <1µA - extends shelf life and standby time in battery-backed applications such as digital cameras and medical sensors. |
| Feedback Reference | 0.8V ±2% - precise internal bandgap reference enables accurate output regulation independent of temperature and line variation. |
| Package | 8-Lead 3mm × 3mm DFN with exposed PGND pad - provides low thermal resistance (θJA = 43°C/W) and robust PCB heat dissipation. |
Pinout & Package
Package: 8-lead plastic DFN (3mm × 3mm), exposed thermal pad (Pin 9) connected to PGND. Requires soldering of exposed pad to PCB ground plane for thermal and electrical integrity.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| SHDN/RT (Pin 1) | Combined shutdown control and oscillator timing input | Pulling to SVIN disables all circuitry; resistor to GND sets switching frequency (2.25–4MHz); no external pull-up required. |
| SGND (Pin 2) | Signal ground reference | Reference node for VFB, ITH, and internal analog circuitry; must be tied to PGND via low-impedance copper plane. |
| SW (Pin 3) | Switch node connection | Drives external inductor; swings between PVIN and PGND; requires tight layout to minimize EMI and ringing. |
| PGND (Pin 4) | Main power ground return | Return path for high-current inductor discharge and output capacitor; shares thermal pad (Pin 9) for low-inductance grounding. |
| PVIN (Pin 5) | Main power supply input | High-current input for top MOSFET; must be decoupled locally with low-ESR ceramic capacitor near the pin. |
| SVIN (Pin 6) | Signal power supply | Bias source for internal analog circuitry; must be ≥ PVIN and decoupled to SGND; powers error amplifier and logic. |
| VFB (Pin 7) | Output voltage feedback input | Compares divided output against 0.8V reference; ±0.1µA input bias enables high-resistor-divider efficiency. |
| ITH (Pin 8) | Error amplifier output / current limit control | Direct access to control loop; used for external compensation and closed-loop stability analysis; nominal 0.4–1.4V range. |
Key Features
| Feature | Design Value |
|---|---|
| Internal Synchronous Power Switches | 0.15Ω P-channel + 0.13Ω N-channel MOSFETs enable >96% peak efficiency and eliminate external diode losses. |
| Current-Mode Control with External Compensation | ITH pin access allows full loop tuning for optimal transient response across diverse output capacitor types (ceramic, polymer, tantalum). |
| 100% Duty-Cycle Dropout Operation | P-channel MOSFET remains fully on when VIN ≈ VOUT, maintaining regulation down to input voltages within ~100mV of output. |
| Stable with Ceramic Output Capacitors | Supports ≥10µF X5R/X7R ceramics without external ESR; eliminates need for bulkier, higher-ESR alternatives. |
| Programmable High-Frequency Switching | 2.25–4MHz range reduces inductor size to ≤2.2µH and height to ≤1mm, enabling ultra-thin portable designs. |
| Low Quiescent & Shutdown Current | 330µA active IQ and <1µA shutdown current maximize battery runtime in intermittent-use applications like remote sensors. |
Applications
| Digital Cameras | Cellular Phones |
|---|---|
Use Scenario: Powering image sensor core voltage (1.2V/1.8V) and ISP logic rails from single Li-ion cell. IC Role / Device Role / Timing Role: Primary buck regulator delivering tightly regulated, low-noise 1A output with fast load-step recovery. Use Value: Enables compact camera modules by supporting 2.2µH inductors and 10µF ceramic output caps, reducing board area by >30% vs legacy 500kHz solutions. |
Use Scenario: Supplying application processor I/O and memory interface rails (2.8V/3.3V) in LTE smartphones. IC Role / Device Role / Timing Role: High-efficiency point-of-load converter operating across wide input range (3.0–4.2V) during battery discharge. Use Value: Maintains >92% efficiency at 500mA load across full battery voltage range, extending talk time without thermal derating. |
| Notebook Computers | Handheld Instruments |
Use Scenario: Generating 1.05V/1.2V CPU core voltage in sub-1kg ultrabooks with strict height constraints. IC Role / Device Role / Timing Role: Compact synchronous buck converter with integrated FETs and 3mm × 3mm footprint. Use Value: Allows use of 1mm-height inductors and eliminates external MOSFET layout, simplifying routing and reducing BOM count. |
Use Scenario: Powering precision ADC/DAC signal chains and microcontroller peripherals in battery-operated test equipment. IC Role / Device Role / Timing Role: Low-noise, low-IQ regulator providing stable 3.3V rail with minimal load-dependent ripple. Use Value: Delivers 30µVPP output ripple at 100mA with 22µF ceramic cap, preserving 16-bit measurement accuracy. |
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; 3A rating; 2.5MHz switching; no RT pin; lower max input voltage headroom. | Best suited for fixed-output industrial modules where input exceeds 3.6V and higher current is needed. | Select TPS62130ARGTR only if fixed 3.3V output and >1.5A load are required; not suitable for adjustable outputs or sub-3.6V inputs. |
| MAX17503GCU+T | 4.5V–60V input; 2A output; 100kHz–2.2MHz programmable frequency; external MOSFETs; higher minimum input voltage. | Targeted at industrial/high-voltage applications (e.g., 12V/24V bus conversion), not low-voltage battery systems. | Choose MAX17503GCU+T for wide-input industrial supplies; LTC3561AEDD#TRPBF remains optimal for 2.5–5.5V battery-powered designs. |
Compared with TPS62130ARGTR and MAX17503GCU+T, the LTC3561AEDD#TRPBF uniquely supports 2.5V minimum input, 0.8V adjustable output, and 4MHz operation in a 3mm × 3mm DFN-making it irreplaceable for ultra-low-voltage, space-constrained portable applications requiring design flexibility.
Availability
LTC3561AEDD#TRPBF is available at Aetrix Electronics and suitable for digital cameras, cellular phones, and handheld instruments requiring stable component supply, long-term lifecycle support, and consistent parametric performance across production batches.
Supply support for LTC3561AEDD#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, serving industrial, automotive, communications, and healthcare markets.
The LTC3561AEDD#TRPBF belongs to Linear's µPower synchronous buck converter family, designed specifically for battery-powered portable electronics demanding high efficiency, small solution size, and seamless dropout operation.
FAQ
What is the maximum supported switching frequency for the LTC3561AEDD#TRPBF?
The LTC3561AEDD#TRPBF supports up to 4MHz switching frequency, programmable via an external resistor on the SHDN/RT pin. While 4MHz operation is guaranteed by design, production testing is performed at 2.5MHz; actual usable frequency depends on input-output voltage ratio and minimum on-time constraints per the fO(MAX) ≈ 6.67 × VOUT/VIN(MAX) formula.
Can the LTC3561AEDD#TRPBF operate with only ceramic capacitors on input and output?
Yes, the LTC3561AEDD#TRPBF is explicitly characterized and stable with ceramic output capacitors ≥10µF (X5R/X7R dielectrics). For input, a 10µF ceramic plus 0.1–1µF high-frequency bypass is recommended. However, designers must verify loop stability across temperature and voltage due to ceramic capacitance variation and low ESR effects on phase margin.
What is the function of the ITH pin on the LTC3561AEDD#TRPBF?
The ITH pin on the LTC3561AEDD#TRPBF is the error amplifier output and current comparator threshold control node. It provides direct access to the inner control loop for external compensation network implementation (e.g., R-C filter), enables closed-loop transient response analysis, and allows optimization of bandwidth and phase margin for specific output capacitor types and load conditions.
Does the LTC3561AEDD#TRPBF support 100% duty-cycle operation?
Yes, the LTC3561AEDD#TRPBF supports true 100% duty-cycle operation in dropout mode. When input voltage drops near the regulated output voltage, the internal P-channel MOSFET remains continuously on, allowing VOUT to track VIN minus conduction losses (typically <100mV drop at 1A), ensuring uninterrupted power delivery during deep battery discharge.
What is the thermal pad (Pin 9) connection requirement for the LTC3561AEDD#TRPBF?
The exposed thermal pad (Pin 9) of the LTC3561AEDD#TRPBF is electrically connected to PGND and must be soldered to a dedicated PCB ground plane using ≥4 thermal vias (0.3mm diameter) to ensure adequate heat dissipation. Failure to connect this pad results in degraded thermal performance (θJA increases significantly) and potential thermal shutdown under sustained 1A load.
LTC3561AEDD#TRPBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 8-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):
- 0.8V
- 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#TRPBF FAQ
1.How can I place an order for LTC3561AEDD#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3561AEDD#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 LTC3561AEDD#TRPBF reliable?
The price and inventory of LTC3561AEDD#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3561AEDD#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC3561AEDD#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3561AEDD#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3561AEDD#TRPBF?
LTC3561AEDD#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3561AEDD#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 LTC3561AEDD#TRPBF?
For technical support, including LTC3561AEDD#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3561AEDD#TRPBF requirements.
6.How does Aetrix verify that LTC3561AEDD#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC3561AEDD#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 LTC3561AEDD#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC3561AEDD#TRPBF?
All LTC3561AEDD#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3561AEDD#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 LTC3561AEDD#TRPBF part is unused and in its original packaging.
Return procedure for LTC3561AEDD#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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