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Analog Devices Inc. LTC3561EDD#PBF
- Part No.:
- LTC3561EDD#PBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 8-WFDFN Exposed Pad
- Datasheet:
-
LTC3561EDD#PBF.pdf
- Description:
- IC REG BUCK ADJ 1A 8DFN
- Quantity:
- Payment:
- Shipping:
Inventory:405
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Product details
Overview
LTC3561EDD#PBF from Analog Devices (formerly Linear Technology) is a constant-frequency, synchronous step-down DC/DC converter designed for medium-power portable applications. It operates from 2.63V to 5.5V input, delivers up to 1.4A peak output current, supports adjustable output voltage from 0.8V to 5V, and features internal 0.11Ω P/N-channel MOSFETs. It is commonly used in cellular phones and digital cameras requiring compact, high-efficiency power conversion.
For engineers reviewing the LTC3561EDD#PBF datasheet, LTC3561EDD#PBF pinout, LTC3561EDD#PBF application, or LTC3561EDD#PBF equivalent, key selection criteria include its 4MHz max switching frequency, 240µA no-load quiescent current, 100% duty-cycle dropout operation, ceramic-capacitor compatibility, and DFN-8 (3mm × 3mm) thermal-enhanced package with exposed pad.
Technical Context
The LTC3561EDD#PBF employs a current-mode control architecture with external compensation via the ITH pin, enabling transient response optimization across wide load and output capacitor variations. Its dual-purpose SHDN/RT pin sets oscillator frequency (via external resistor) and enables shutdown by pulling to SVIN.
It integrates synchronous P-channel (top) and N-channel (bottom) power switches with matched 0.11Ω RDS(ON) at 3.3V, supports pulse-skipping at light loads for low-noise operation, and includes undervoltage lockout (2.5V threshold) and thermal shutdown (≈150°C).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VIN Range | 2.63V to 5.5V - supports single-cell Li-ion (fully charged) and dual-cell alkaline inputs without pre-regulation. |
| IOUT Max | 1.4A peak - sufficient for core logic rails in smartphones and imaging modules. |
| fSW Max | 4MHz - enables use of 2.2µH inductors ≤2mm height and small ceramic capacitors. |
| VFB | 0.8V ±2% - sets output voltage via external resistor divider; enables precise 1.8V, 2.5V, 3.3V rails. |
| IQ (No Load) | 240µA - extends battery runtime in standby modes of wireless LAN and camera systems. |
| RDS(ON) | 0.11Ω (top & bottom) - minimizes conduction loss; achieves up to 95% efficiency at 1A/2.5V out. |
| Duty Cycle | 100% in dropout - maintains regulation as input drops to VOUT, critical for battery end-of-discharge. |
| Shutdown IQ | <1µA - ensures negligible battery drain during system sleep or power-off states. |
Pinout & Package
Package: 8-lead (3mm × 3mm) plastic DFN with exposed thermal pad (Pin 9), requiring soldering to PCB ground for rated thermal performance (θJA = 43°C/W).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| SHDN/RT (1) | Combined shutdown control & oscillator timing | Pulling to SVIN disables all circuitry; resistor to GND sets fSW (0.85–4MHz). |
| SGND (2) | Signal ground reference | Reference point for feedback, error amplifier, and compensation components; must be isolated from PGND. |
| SW (3) | Switch node | Connects to inductor; swings between PVIN and PGND; requires low-inductance layout. |
| PGND (4) | Main power ground | Return path for high-current inductor and output capacitor; connects to CIN(–) and COUT(–). |
| PVIN (5) | Main input supply | High-current VIN input; must be decoupled directly to PGND with low-ESR ceramic capacitor. |
| SVIN (6) | Signal power supply | Bias rail for internal analog circuitry; must be ≥ PVIN and decoupled to SGND. |
| VFB (7) | Feedback input | Monitors resistive divider output; 0.8V reference enables accurate output voltage setting. |
| ITH (8) | Error amplifier output / compensation node | Controls peak switch current; used for loop compensation and external soft-start ramping. |
| Exposed Pad (9) | Thermal & electrical ground | Mandatory solder connection to PCB ground plane for thermal dissipation and noise reduction. |
Key Features
| Feature | Design Value |
|---|---|
| Constant-frequency current-mode control | Enables predictable EMI profile and stable loop behavior across input/output variations. |
| Integrated 0.11Ω synchronous MOSFETs | Eliminates external diode and reduces conduction loss-no external Schottky required. |
| 100% duty-cycle dropout operation | Maintains regulated output down to VIN = VOUT, maximizing usable battery capacity. |
| Low-noise pulse-skipping mode | Reduces audible noise and EMI during light-load conditions without sacrificing regulation. |
| Ceramic capacitor stability | Compatible with low-ESR ceramic input/output caps-no tantalum or polymer required. |
| External compensation via ITH pin | Allows full loop tuning for diverse output capacitance types (e.g., X5R/X7R ceramics, POSCAP). |
Applications
| Cellular Phone Power Rail | Digital Camera Core Supply |
|---|---|
Use Scenario: Powers baseband processor or RF transceiver in 3G/4G handsets operating from single-cell Li-ion (3.0–4.2V). IC Role / Device Role / Timing Role: Primary buck regulator delivering 1.8V/1.2A with fast load-step response to handle burst transmission. Use Value: 240µA quiescent current extends standby time; 4MHz operation allows ultra-thin 2mm-height inductor integration. | Use Scenario: Supplies image sensor and ISP in compact digital cameras with tight board space constraints. IC Role / Device Role / Timing Role: High-efficiency step-down converter generating 2.5V/1A from 3.3V system rail. Use Value: 95% peak efficiency minimizes thermal rise near optics; DFN-8 package fits within 3×3mm footprint. |
| Notebook System Management | Wireless LAN Module Supply |
Use Scenario: Provides auxiliary 3.3V rail for embedded controller or touchpad interface in ultraportable notebooks. IC Role / Device Role / Timing Role: Secondary buck converter supporting always-on functions with low IQ. Use Value: <1µA shutdown current prevents battery drain during hibernation; stable with 10µF ceramic input cap. | Use Scenario: Powers 802.11n/ac WLAN chipset requiring clean, ripple-free 1.2V core voltage. IC Role / Device Role / Timing Role: Low-noise synchronous buck regulator with pulse-skipping for quiet RF operation. Use Value: Pulse-skipping mode avoids interference with 2.4GHz/5GHz bands; 0.8V feedback reference enables precise 1.2V setpoint. |
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 |
|---|---|---|---|
| TPS62231DRVR | Fixed 3.3V output; 1.8A rating; 3.5MHz max fSW; 20µA IQ; no external compensation. | Not adjustable-requires redesign if output voltage differs; better for fixed-rail, ultra-low-IQ apps. | Select when 3.3V output suffices and minimal BOM count is prioritized over flexibility. |
| MAX17503ATP+T | Wider VIN (4.5–60V); 2.5A; requires external MOSFETs; no integrated switches. | Designed for industrial/high-VIN apps-not suitable for 2.6–5.5V battery-powered systems. | Choose only for non-battery, high-input-voltage applications; not a functional substitute for LTC3561EDD#PBF. |
Compared with TPS62231DRVR and MAX17503ATP+T, the LTC3561EDD#PBF uniquely balances adjustable output (0.8–5V), 1.4A capability, 4MHz switching, and 240µA quiescent current in a thermally optimized 3×3mm DFN-making it optimal for space-constrained, battery-fed consumer electronics where voltage flexibility and light-load efficiency are critical.
Availability
LTC3561EDD#PBF is available at Aetrix Electronics and suitable for cellular phones, digital cameras, and wireless LAN modules requiring stable component supply, long-term manufacturability, and RoHS-compliant packaging.
Supply support for LTC3561EDD#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. (ADI) is a global semiconductor leader specializing in high-performance analog, mixed-signal, and power management ICs for precision, power, and connectivity applications.
The LTC3561EDD#PBF belongs to ADI's Linear Technology legacy power management portfolio, engineered specifically for compact, high-efficiency DC/DC conversion in battery-powered portable electronics with stringent size and quiescent current requirements.
FAQ
What is the maximum input voltage the LTC3561EDD#PBF can safely handle?
The LTC3561EDD#PBF has an absolute maximum input voltage rating of 6V on PVIN and SVIN pins. Its recommended operating range is 2.63V to 5.5V. Exceeding 6V may cause permanent damage. The device includes undervoltage lockout (UVLO) that activates below ~2.5V to prevent unstable operation, but no overvoltage protection is integrated-external clamping is advised if input transients exceed 6V.
Can the LTC3561EDD#PBF operate with only ceramic capacitors on input and output?
Yes, the LTC3561EDD#PBF is explicitly designed to be stable with ceramic capacitors. Its current-mode architecture and OPTI-LOOP compensation tolerate low-ESR ceramics. However, layout care is essential: place 0.1–1µF high-frequency ceramic caps close to PVIN/PGND and VFB/SGND, avoid long traces on SW and VFB nodes, and ensure the exposed pad is solidly soldered to ground to maintain phase margin across temperature.
How do I set the output voltage of the LTC3561EDD#PBF to 1.8V?
To set the LTC3561EDD#PBF output to 1.8V, use a resistive divider from VOUT to SGND with VFB connected to the midpoint. Given VFB = 0.8V, select R1 (top) and R2 (bottom) such that 1.8V = 0.8V × (1 + R1/R2). A standard solution is R2 = 100kΩ and R1 = 125kΩ (1% tolerance), yielding 1.8V ±0.5%. Keep divider current below 5µA (e.g., total resistance >160kΩ) to minimize quiescent loss.
Does the LTC3561EDD#PBF support forced PWM mode, or only pulse-skipping?
The LTC3561EDD#PBF operates exclusively in pulse-skipping mode at light loads-there is no forced PWM or skip-mode disable function. Pulse-skipping reduces switching losses and acoustic noise while maintaining regulation. For applications requiring constant-frequency operation under all load conditions, consider alternatives like the LTC3562 or ADP2370, which offer true forced-PWM modes.
What thermal derating applies to the LTC3561EDD#PBF at 85°C ambient?
At 85°C ambient, the LTC3561EDD#PBF's junction temperature must stay ≤125°C. With θJA = 43°C/W, maximum allowable power dissipation is (125 − 85)/43 ≈ 0.93W. At 1.4A output and 3.3V input, typical power loss is ~0.15W (95% efficiency), well within limit. However, in dropout (e.g., 2.8VIN/2.5VOUT), conduction loss rises-verify thermal performance using measured RDS(ON) and actual load current in your layout.
LTC3561EDD#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):
- 2.625V
- Voltage - Input (Max):
- 5.5V
- Voltage - Output (Min/Fixed):
- 0.8V
- Voltage - Output (Max):
- 5V
- Current - Output:
- 1A
- Frequency - Switching:
- 1MHz
- Synchronous Rectifier:
- Yes
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-DFN (3x3)
LTC3561EDD#PBF FAQ
1.How can I place an order for LTC3561EDD#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3561EDD#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 LTC3561EDD#PBF reliable?
The price and inventory of LTC3561EDD#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3561EDD#PBF is usually 5 days.
3.What payment methods are accepted for LTC3561EDD#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3561EDD#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3561EDD#PBF?
LTC3561EDD#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3561EDD#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 LTC3561EDD#PBF?
For technical support, including LTC3561EDD#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3561EDD#PBF requirements.
6.How does Aetrix verify that LTC3561EDD#PBF is sourced from the original manufacturer or authorized distributors?
All LTC3561EDD#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 LTC3561EDD#PBF meets industry standards.
7.What is the process for return or replacement of LTC3561EDD#PBF?
All LTC3561EDD#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3561EDD#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 LTC3561EDD#PBF part is unused and in its original packaging.
Return procedure for LTC3561EDD#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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