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Analog Devices Inc. LTC3568EDD#TRPBF
- Part No.:
- LTC3568EDD#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 10-WFDFN Exposed Pad
- Datasheet:
-
LTC3568EDD#TRPBF.pdf
- Description:
- IC REG BUCK ADJ 1.8A 10DFN
- Quantity:
- Payment:
- Shipping:
Inventory:5,526
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Product details
Overview
LTC3568EDD#TRPBF from Analog Devices (formerly Linear Technology) is a 1.8A, 4MHz synchronous step-down DC/DC converter IC designed for medium-power portable applications. It operates from 2.5V to 5.5V input, delivers adjustable 0.8V–5V output, features 0.11Ω internal MOSFETs, and uses current-mode control with external compensation for optimized transient response in space-constrained designs like handheld instruments and digital cameras.
For engineers reviewing the LTC3568EDD#TRPBF datasheet, LTC3568EDD#TRPBF pinout, LTC3568EDD#TRPBF application, or LTC3568EDD#TRPBF equivalent, key selection criteria include its 4MHz max switching frequency, Burst Mode® operation for ultra-low quiescent current (60µA), 100% duty-cycle dropout capability, and compatibility with ceramic output capacitors in a compact 3mm × 3mm DFN package.
Technical Context
The LTC3568EDD#TRPBF implements a constant-frequency current-mode architecture with dual P-channel/N-channel synchronous power switches. Its oscillator frequency is set via an external resistor on the SHDN/RT pin or synchronized to an external clock via SYNC/MODE, supporting operation up to 4MHz with duty cycle limitations.
It integrates OPTI-LOOP® compensation through the ITH pin, enabling loop optimization across load and capacitor variations. The device supports three low-current modes-Burst Mode®, pulse-skipping, and forced continuous-selected via voltage levels on SYNC/MODE, each delivering distinct trade-offs between efficiency, ripple, and EMI profile.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 2.5V to 5.5V - supports single-cell Li-ion, USB, and regulated 3.3V/5V rails without pre-regulation. |
| Output Current | 1.8A continuous - sufficient for powering core logic, image sensors, or RF sections in portable devices. |
| Switching Frequency | Up to 4MHz - enables use of sub-2mm-height inductors and small ceramic capacitors, reducing board area. |
| Internal RDS(ON) | 0.11Ω top/bottom - minimizes conduction loss and improves full-load efficiency up to 96%. |
| Quiescent Current | 60µA in dropout - extends battery runtime during light-load or standby conditions. |
| Feedback Reference | 0.8V ±2% - allows precise output regulation with standard resistor dividers and supports 0.8V–5V adjustment range. |
| Shutdown Current | <1µA - ensures negligible battery drain when system is powered off. |
| PGOOD Threshold | ±7.5% - provides reliable power-good signaling for microcontroller reset or sequencing control. |
Pinout & Package
Package: 10-lead (3mm × 3mm) plastic DFN with exposed thermal pad (Pin 11 = GND), rated for –40°C to 125°C junction temperature.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| SHDN/RT (1) | Oscillator timing & shutdown control | Resistor-to-ground sets frequency; pulled to SVIN to disable regulator with soft-start reset. |
| SYNC/MODE (2) | Mode selection & external sync input | Voltage level selects Burst Mode® (SVIN), pulse skip (SGND), or forced continuous (½×SVIN); accepts external clock for EMI reduction. |
| SGND (3) | Signal ground reference | Reference for feedback, error amplifier, and compensation network-must be isolated from PGND to minimize noise coupling. |
| SW (4) | Switch node | Connects to inductor; swings from PVIN to PGND-requires tight layout and low-inductance routing to limit EMI. |
| PGND (5) | Power ground return | Low-impedance return path for high di/dt currents from CIN, COUT, and bottom switch-must connect directly to exposed pad. |
| PVIN (6) | Main power input | Supplies high-current path to top switch; requires local 22µF ceramic decoupling to PGND. |
| SVIN (7) | Signal power supply | Powers internal analog circuitry; must be ≥ PVIN and decoupled to SGND with low-ESR capacitor. |
| PGOOD (8) | Open-drain power-good indicator | Pulls low when VOUT deviates >±7.5%-used for system enable/disable or fault reporting. |
| VFB (9) | Feedback input | Compares resistive divider output against 0.8V reference to regulate VOUT; input current ≤±0.1µA minimizes divider loss. |
| ITH (10) | Error amplifier output / compensation node | Controls peak inductor current; external RC network sets loop stability and transient response. |
Key Features
| Feature | Design Value |
|---|---|
| 4MHz max switching frequency | Enables <2mm-height magnetics and compact 0402/0603 ceramic capacitors-critical for ultra-thin portable PCBs. |
| Burst Mode® operation | Reduces gate charge losses at light loads, achieving 60µA quiescent current and extending battery life in standby. |
| Synchronous 0.11Ω MOSFETs | Eliminates external Schottky diode, improves efficiency by ~5–8% over asynchronous designs at 1A load. |
| 100% duty-cycle dropout | Maintains regulation down to VIN ≈ VOUT, supporting brownout operation without output collapse. |
| OPTI-LOOP® compensation | External ITH network allows tuning of bandwidth and phase margin for diverse output capacitor types (ceramic, polymer, tantalum). |
| Three selectable operating modes | Engineers can optimize for efficiency (Burst), low ripple (forced continuous), or EMI (pulse skip) without hardware change. |
Applications
| Digital Cameras | Cellular Phones |
|---|---|
Use Scenario: Powering CMOS image sensor and ISP core requiring stable 1.8V/2.5V at up to 1.5A with minimal board area. IC Role / Device Role / Timing Role: Primary buck regulator delivering regulated core voltage with fast load-step response to handle burst capture events. Use Value: 4MHz operation allows 2.2µH inductor height ≤2mm; Burst Mode® maintains >85% efficiency at 10mA preview current. | Use Scenario: Supplying application processor I/O or memory interface from single-cell Li-ion battery (2.8V–4.2V). IC Role / Device Role / Timing Role: High-efficiency point-of-load converter with programmable frequency to avoid AM band interference. Use Value: SYNC/MODE pin enables synchronization to baseband clock, eliminating beat frequencies and easing RF compliance testing. |
| Notebook Computers | Handheld Instruments |
Use Scenario: Generating 3.3V for USB controller or display interface in fanless ultrabook designs with thermal constraints. IC Role / Device Role / Timing Role: Compact, thermally efficient buck converter leveraging exposed DFN pad for direct PCB copper pour heat sinking. Use Value: 0.11Ω RDS(ON) and 3mm × 3mm footprint reduce power loss and layout area vs. larger SO-8 alternatives. | Use Scenario: Powering precision ADC, op-amp rails, and microcontroller in battery-operated test equipment. IC Role / Device Role / Timing Role: Low-noise, low-quiescent-current regulator supporting long-duration field measurements. Use Value: Forced continuous mode provides fixed-frequency ripple for predictable filtering; 60µA dropout IQ preserves battery for weeks in sleep mode. |
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 | 3.6V–17V input, 3A output, 2.5MHz max, 0.12Ω FETs, no Burst Mode® | Higher input range suits industrial 12V rails; lacks ultra-low-IQ mode for battery longevity | Choose for wide-input industrial systems where 2.5V min input is not required. |
| MP2143GJ-Z | 2.5V–5.5V input, 2A output, 2MHz max, 0.13Ω FETs, proprietary eco-mode | Lower max frequency limits inductor size reduction; eco-mode less optimized than Burst Mode® for sub-100µA IQ | Consider for cost-sensitive consumer designs where 4MHz is unnecessary and footprint flexibility exists. |
Compared with TPS62130ARGTR and MP2143GJ-Z, the LTC3568EDD#TRPBF uniquely combines 4MHz operation, 60µA dropout IQ, and true Burst Mode® within a 3mm × 3mm DFN-making it optimal for space- and battery-life-critical portable applications where input stays within 2.5V–5.5V.
Availability
LTC3568EDD#TRPBF is available at Aetrix Electronics and suitable for notebook computers, digital cameras, cellular phones, handheld instruments, and board-mounted power supplies requiring stable component supply, long-term lifecycle support, and consistent parametric performance across production batches.
Supply support for LTC3568EDD#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 characterization and long-term product commitment.
The LTC3568EDD#TRPBF belongs to Linear's high-frequency synchronous buck converter family, engineered specifically for portable electronics demanding ultra-compact size, high efficiency across load range, and robust transient response under dynamic battery voltage conditions.
FAQ
What is the maximum supported switching frequency for the LTC3568EDD#TRPBF?
The LTC3568EDD#TRPBF supports up to 4MHz operation, guaranteed by design but not production-tested due to duty cycle limitations. At 4MHz, minimum on-time constraints require VIN/VOUT ratios ≤2.5 to maintain regulation. For robust production use, 1MHz–2.5MHz is recommended with RT resistor values between 150kΩ and 430kΩ per Figure 2 in the datasheet.
How does the LTC3568EDD#TRPBF achieve 60µA quiescent current in dropout?
The LTC3568EDD#TRPBF achieves 60µA quiescent current in dropout by turning on the P-channel MOSFET continuously (100% duty cycle) while disabling gate drive circuitry and biasing only essential analog blocks. This low-IQ state is maintained across the full –40°C to 125°C temperature range and is verified per Electrical Characteristics Table, Note 2.
Can the LTC3568EDD#TRPBF use all-ceramic input and output capacitors?
Yes, the LTC3568EDD#TRPBF is stable with ceramic capacitors, but layout and component selection require care. Use X5R/X7R dielectrics, keep CIN ≥22µF (with 0.1µF–1µF high-frequency bypass), and ensure COUT meets ESR <130mΩ for 100mV ripple at 1MHz. Avoid placing ceramic caps directly after long input traces to prevent ringing-induced damage.
What is the function of the ITH pin on the LTC3568EDD#TRPBF?
On the LTC3568EDD#TRPBF, the ITH pin serves as the error amplifier output and primary compensation node. It sets peak inductor current, enables OPTI-LOOP® tuning via external RC networks, provides a test point for closed-loop transient analysis, and supports programmable soft-start by ramping its voltage externally during startup.
Is the LTC3568EDD#TRPBF pin-compatible with other Linear/Analog Devices buck regulators?
No, the LTC3568EDD#TRPBF has a unique 10-pin DFN pinout optimized for its dual-supply (PVIN/SVIN) architecture and multi-function pins (SHDN/RT, SYNC/MODE). It is not pin-compatible with LTC3566, LTC3567, or LTC3569-each requires dedicated PCB layout and compensation design per their respective datasheets.
LTC3568EDD#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):
- 2.25V
- Voltage - Input (Max):
- 5.5V
- Voltage - Output (Min/Fixed):
- 0.8V
- Voltage - Output (Max):
- 5V
- Current - Output:
- 1.8A
- 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)
LTC3568EDD#TRPBF FAQ
1.How can I place an order for LTC3568EDD#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3568EDD#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 LTC3568EDD#TRPBF reliable?
The price and inventory of LTC3568EDD#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3568EDD#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC3568EDD#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3568EDD#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3568EDD#TRPBF?
LTC3568EDD#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3568EDD#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 LTC3568EDD#TRPBF?
For technical support, including LTC3568EDD#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3568EDD#TRPBF requirements.
6.How does Aetrix verify that LTC3568EDD#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC3568EDD#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 LTC3568EDD#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC3568EDD#TRPBF?
All LTC3568EDD#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3568EDD#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 LTC3568EDD#TRPBF part is unused and in its original packaging.
Return procedure for LTC3568EDD#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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