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Analog Devices Inc. LTC3568EDD#PBF
- Part No.:
- LTC3568EDD#PBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 10-WFDFN Exposed Pad
- Datasheet:
-
LTC3568EDD#PBF.pdf
- Description:
- IC REG BUCK ADJ 1.8A 10DFN
- Quantity:
- Payment:
- Shipping:
Inventory:1,168
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Product details
Overview
LTC3568EDD#PBF from Analog Devices (formerly Linear Technology) is a 1.8A, 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 0.8V–5V output, features 0.11Ω internal MOSFETs, and supports Burst Mode® for ultra-low quiescent current (60µA) in light-load applications such as portable digital cameras and cellular handsets.
For engineers reviewing the LTC3568EDD#PBF datasheet, LTC3568EDD#PBF pinout, LTC3568EDD#PBF application, or LTC3568EDD#PBF equivalent, key selection criteria include its 4MHz switching capability enabling sub-2mm-height magnetics, current-mode control with external compensation for transient optimization, and selectable operation modes (Burst, pulse-skip, forced continuous) to balance efficiency vs. noise in battery-powered systems.
Technical Context
The LTC3568EDD#PBF employs a constant-frequency current-mode architecture with an externally programmable oscillator (via RT resistor or SYNC/MODE pin), enabling precise frequency control up to 4MHz. Its dual-MOSFET synchronous rectification uses P-channel high-side and N-channel low-side switches with matched 0.11Ω RDS(ON) at 3.3V, supporting 100% duty-cycle dropout operation.
Control logic integrates three selectable operating modes via the SYNC/MODE pin: Burst Mode® (for <1µA shutdown current and 60µA quiescent current), pulse-skipping (for reduced ripple at light loads), and forced continuous conduction (for fixed-frequency EMI filtering). The ITH pin provides direct access to the error amplifier output for loop compensation and transient response tuning.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 2.5V to 5.5V - supports single-cell Li-ion, USB, and 3.3V/5V rail inputs without pre-regulation |
| Output Current | 1.8A continuous - sufficient for core voltage regulation in portable processors and imaging sensors |
| Switching Frequency | Up to 4MHz - enables use of 2.2µH inductors ≤2mm height and compact ceramic capacitors |
| Internal RDS(ON) | 0.11Ω top/bottom - minimizes conduction loss, enabling >96% peak efficiency at 1.8A |
| Feedback Reference | 0.8V ±1.6% - sets output voltage via external resistor divider; stable with ceramic output capacitors |
| Quiescent Current | 60µA in dropout - extends battery runtime in always-on subsystems like camera standby mode |
| Shutdown Current | <1µA - meets stringent off-state leakage requirements in handheld instrumentation |
| Power Good Threshold | ±7.5% at VFB - provides reliable system reset signaling during brown-out or startup sequencing |
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. Requires soldering of exposed pad to PCB for thermal performance (θJA = 43°C/W).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| SHDN/RT (1) | Oscillator timing & shutdown control | Resistor-to-ground sets frequency (e.g., 324kΩ → 1MHz); pulled to SVIN to disable regulator |
| SYNC/MODE (2) | Mode selection & external clock sync | Ground = pulse-skip; SVIN = Burst Mode®; ~0.5×SVIN = forced continuous; external clock input synchronizes switching |
| SGND (3) | Signal ground reference | Return for feedback, compensation, and small-signal circuitry-must be separated from PGND per layout guidelines |
| SW (4) | Switch node | Connects to inductor; swings between PVIN and PGND; requires tight layout to minimize EMI |
| PGND (5) | Power ground return | Low-impedance return for CIN, COUT, and bottom MOSFET; tied to exposed pad |
| PVIN (6) | Main power input | High-current VIN path; must be decoupled directly to PGND with low-ESR capacitor |
| SVIN (7) | Signal supply voltage | Powers internal analog/digital circuitry; must be ≥PVIN and decoupled to SGND |
| PGOOD (8) | Open-drain power-good indicator | Pulled low when VOUT deviates >±7.5% from regulation; requires external pull-up |
| VFB (9) | Feedback input | Compares divided output to 0.8V reference; sets output voltage via R1/R2 divider |
| ITH (10) | Error amplifier output / compensation node | Controls peak inductor current; used for loop compensation and transient response optimization |
Key Features
| Feature | Design Value |
|---|---|
| Synchronous 0.11Ω MOSFETs | Eliminates external catch diode, reduces conduction loss, and enables >96% efficiency at full load |
| Burst Mode® operation | Reduces quiescent current to 60µA while maintaining regulation-critical for battery life in standby |
| 100% duty-cycle dropout | Maintains regulation down to VIN ≈ VOUT + VDS(ON), extending usable battery range in Li-ion discharge profiles |
| OPTI-LOOP® compensation | External RC network on ITH pin allows transient response tuning across wide load/capacitor ranges |
| Three selectable operating modes | Enables system-level trade-offs: Burst Mode® (efficiency), pulse-skip (low ripple), forced continuous (EMI filterability) |
| 4MHz max switching frequency | Supports tiny 2.2µH inductors and 22µF/10µF ceramic output caps-reducing board area by >40% vs. 500kHz designs |
Applications
| Portable Digital Cameras | Smartphone Baseband Power |
|---|---|
Use Scenario: Powering image sensor and ISP core voltage rails during burst capture mode with rapid load transients. IC Role / Device Role / Timing Role: Primary 1.8A synchronous buck regulator delivering 1.8V/2.5V from single-cell Li-ion battery. Use Value: OPTI-LOOP® compensation and 4MHz switching enable fast transient response (<50µs settling) and minimal output droop under 1A load steps. | Use Scenario: Supplying processor I/O and memory interface rails in space-constrained smartphone mainboard. IC Role / Device Role / Timing Role: Compact, high-efficiency step-down converter operating in forced continuous mode for predictable EMI spectrum. Use Value: 3mm × 3mm DFN package and ceramic-capable design reduce solution footprint by 35% vs. legacy 500kHz solutions. |
| Notebook Subsystem Regulator | Handheld Test Instrumentation |
Use Scenario: Generating 3.3V auxiliary rail for USB controller and display interface in ultrabook clamshell design. IC Role / Device Role / Timing Role: Medium-power buck converter with Burst Mode® enabled to minimize no-load power draw during sleep states. Use Value: 60µA quiescent current and <1µA shutdown current extend S3/S4 suspend time without compromising wake-up latency. | Use Scenario: Providing stable 2.5V/1.8V rails for precision ADC front-end and microcontroller in battery-operated field meter. IC Role / Device Role / Timing Role: Low-noise, thermally robust DC/DC converter with 125°C-rated DFN package for industrial ambient conditions. Use Value: Exposed thermal pad and 43°C/W θJA allow full 1.8A output in 60°C ambient without derating or heatsinking. |
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, 0.095Ω RDS(ON); no Burst Mode®, uses PFM/PWM auto-switching | Better suited for higher-input industrial rails; lacks dedicated Burst Mode® for ultra-low-IQ optimization | Select when input exceeds 5.5V or 3A output is required; avoid if 60µA IQ is mandatory |
| MP2143GJ-Z | 2.5V–5.5V input, 2A output, 2MHz max, 0.12Ω RDS(ON); integrated soft-start, no SYNC/MODE pin for mode selection | Fixed PWM-only operation; simpler interface but no user-selectable low-noise/low-IQ trade-off | Choose for cost-sensitive designs where Burst Mode® and external sync are unnecessary |
Compared with TPS62130ARGTR and MP2143GJ-Z, the LTC3568EDD#PBF uniquely combines 4MHz operation, true Burst Mode®, and 0.8V reference in 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#PBF is available at Aetrix Electronics and suitable for portable digital cameras, cellular handsets, and handheld instrumentation requiring stable component supply, long-term lifecycle support, and guaranteed lead-free compliance.
Supply support for LTC3568EDD#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 its high-performance power management portfolio. Linear's legacy emphasizes precision, efficiency, and integration in analog and power ICs.
The LTC3568EDD#PBF belongs to Linear's high-frequency synchronous buck converter family, designed specifically for compact, battery-powered systems demanding high efficiency across wide load ranges-from µA standby to multi-amp active operation.
FAQ
What is the maximum supported switching frequency for the LTC3568EDD#PBF?
The LTC3568EDD#PBF supports up to 4MHz switching frequency, achieved by configuring the RT resistor or synchronizing to an external clock via the SYNC/MODE pin. While 4MHz operation is guaranteed by design, production testing is performed at up to 1.15MHz; higher frequencies require validation per application conditions including duty cycle limits (fO(MAX) ≈ 6.67 × VOUT/VIN(MAX) MHz).
Does the LTC3568EDD#PBF require an external catch diode?
No, the LTC3568EDD#PBF does not require an external catch diode. Its fully synchronous architecture integrates both high-side P-channel and low-side N-channel MOSFETs with 0.11Ω RDS(ON), eliminating conduction losses and reverse recovery issues associated with discrete diodes.
How is output voltage set on the LTC3568EDD#PBF?
The LTC3568EDD#PBF output voltage is set using an external resistive divider connected to the VFB pin. With a precise 0.8V internal reference, VOUT = 0.8V × (1 + R1/R2). Feedback resistors should limit current to <5µA for optimal efficiency, and X5R/X7R ceramic capacitors are recommended for feed-forward stability.
What thermal considerations apply to the LTC3568EDD#PBF package?
The LTC3568EDD#PBF uses a 10-lead 3mm × 3mm DFN with exposed thermal pad (Pin 11). For rated thermal performance, this pad must be soldered to a PCB copper plane. Thermal resistance is θJA = 43°C/W and θJC = 3°C/W; junction temperature must remain ≤125°C under all operating conditions.
Can the LTC3568EDD#PBF operate in dropout, and what is its behavior?
Yes, the LTC3568EDD#PBF supports 100% duty-cycle dropout operation. When VIN drops near VOUT, the P-channel MOSFET remains continuously on, allowing VOUT to track VIN minus RDS(ON) × ILOAD and inductor DCR drop-extending usable battery life in deep-discharge scenarios.
LTC3568EDD#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):
- 2.25V
- 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#PBF FAQ
1.How can I place an order for LTC3568EDD#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3568EDD#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 LTC3568EDD#PBF reliable?
The price and inventory of LTC3568EDD#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3568EDD#PBF is usually 5 days.
3.What payment methods are accepted for LTC3568EDD#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3568EDD#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3568EDD#PBF?
LTC3568EDD#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3568EDD#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 LTC3568EDD#PBF?
For technical support, including LTC3568EDD#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3568EDD#PBF requirements.
6.How does Aetrix verify that LTC3568EDD#PBF is sourced from the original manufacturer or authorized distributors?
All LTC3568EDD#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 LTC3568EDD#PBF meets industry standards.
7.What is the process for return or replacement of LTC3568EDD#PBF?
All LTC3568EDD#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3568EDD#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 LTC3568EDD#PBF part is unused and in its original packaging.
Return procedure for LTC3568EDD#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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