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Analog Devices Inc. LTC3568IDD#PBF
- Part No.:
- LTC3568IDD#PBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 10-WFDFN Exposed Pad
- Datasheet:
-
LTC3568IDD#PBF.pdf
- Description:
- IC REG BUCK ADJ 1.8A 10DFN
- Quantity:
- Payment:
- Shipping:
Inventory:196
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Product details
Overview
LTC3568IDD#PBF from Analog Devices (formerly Linear Technology) is a 1.8A, 4MHz synchronous step-down DC/DC converter optimized 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 transient optimization. It powers digital camera core rails and cellular phone baseband processors.
For engineers reviewing the LTC3568IDD#PBF datasheet, LTC3568IDD#PBF pinout, LTC3568IDD#PBF application, or LTC3568IDD#PBF equivalent, key selection criteria include its 4MHz max switching frequency enabling <2mm-height inductors, Burst Mode® operation for <60µA quiescent current, and 10-lead 3mm × 3mm DFN package with exposed thermal pad.
Technical Context
The LTC3568IDD#PBF implements a constant-frequency current-mode architecture with dual P-channel/N-channel synchronous power switches. Its oscillator frequency is set by an external RT resistor (e.g., 324kΩ for 1MHz) or synchronized to an external clock up to 4MHz via the SYNC/MODE pin.
It supports three low-load operating modes: Burst Mode® (for peak efficiency at light loads), pulse-skipping mode (reduced ripple), and forced continuous conduction mode (fixed-frequency noise for EMI filtering). Dropout operation enables 100% duty cycle with only 60µA quiescent current.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 2.5V to 5.5V - supports single-cell Li-ion, USB VBUS, and regulated 3.3V/5V rails without pre-regulation. |
| Output Current | 1.8A continuous - sufficient for powering ARM Cortex-A series SoCs and image signal processors. |
| Switching Frequency | Up to 4MHz - enables use of 2.2µH inductors ≤2mm height and compact ceramic capacitors. |
| RDS(ON) (Top/Bottom) | 0.11Ω each at 3.3V - minimizes conduction loss and improves full-load efficiency to 96%. |
| IQ (Active) | 240µA typical - enables long battery runtime in always-on subsystems like touch controllers. |
| IQ (Burst Mode) | 60µA - extends standby time in handheld instruments and IoT sensors between wake-ups. |
| Feedback Reference | 0.8V ±1.6% - allows precise output regulation with standard resistor divider networks. |
| Shutdown Current | <1µA - ensures negligible battery drain during system sleep or transport mode. |
Pinout & Package
Package: 10-lead (3mm × 3mm) plastic DFN with exposed thermal pad (Pin 11), rated for –40°C to 125°C junction temperature. Exposed pad must be soldered to PCB ground plane for thermal performance (θJA = 43°C/W).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| SHDN/RT (1) | Oscillator timing & shutdown control | Resistor-to-ground sets fSW; pulled to SVIN to disable regulator with <1µA IQ. |
| SYNC/MODE (2) | Mode selection & clock sync input | Selects Burst Mode®, pulse-skip, or forced CCM; accepts external 0.4–4MHz sync signal. |
| SGND (3) | Signal ground reference | Reference for feedback, error amplifier, and compensation network-separate from PGND. |
| SW (4) | Switch node | Connects to inductor; swings from PVIN to PGND-requires tight layout to minimize EMI. |
| PGND (5) | Power ground return | Low-impedance return path for high di/dt currents from CIN, COUT, and bottom FET. |
| PVIN (6) | Main power input | Supplies top P-MOSFET; must be decoupled directly to PGND with low-ESR ceramic capacitor. |
| SVIN (7) | Signal power supply | Powers internal analog circuitry; must be ≥ PVIN and decoupled to SGND. |
| PGOOD (8) | Power-good open-drain output | Asserts low when VOUT deviates >±7.5%-used for sequencing or fault indication. |
| VFB (9) | Feedback input | Compares divided VOUT against 0.8V reference; input bias 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 |
|---|---|
| Synchronous 0.11Ω MOSFETs | Eliminates external Schottky diode, reduces conduction loss, and enables >95% efficiency at 1A load. |
| Burst Mode® operation | Reduces gate charge losses at light loads, achieving 60µA IQ while maintaining regulation. |
| OPTI-LOOP® compensation | External ITH node allows tuning of bandwidth and phase margin across wide output capacitor ranges. |
| 100% duty cycle dropout | Maintains regulation down to VIN ≈ VOUT + RDS(ON)·ILOAD, critical for battery voltage sag scenarios. |
| Short-circuit protection | Current-limit foldback and hiccup mode prevent thermal runaway during sustained overload. |
| Stable with ceramic capacitors | No minimum ESR requirement simplifies BOM and enables ultra-low-profile designs using X5R/X7R MLCCs. |
Applications
| Digital Camera Core Power | Cellular Phone Baseband |
|---|---|
Use Scenario: Powers image sensor, ISP, and memory interface in compact digital cameras with strict height constraints. IC Role / Device Role / Timing Role: Primary step-down regulator delivering 1.2V/1.8A from 3.6V Li-ion battery. Use Value: 4MHz operation enables 2.2µH/2mm-height inductor and 22µF ceramic output cap-reducing board area by 35% vs. 1MHz designs. |
Use Scenario: Supplies baseband processor core voltage in GSM/UMTS handsets requiring dynamic voltage scaling. IC Role / Device Role / Timing Role: Adjustable 0.8V–1.5V buck converter with fast load-transient response for CPU DVFS. Use Value: OPTI-LOOP® compensation and 1.8A capability support sub-100ns load steps without output droop exceeding 30mV. |
| Notebook System Agent Rail | Handheld Test Instrument |
Use Scenario: Generates 1.05V system agent rail for Intel Atom-based embedded notebooks with fanless cooling. IC Role / Device Role / Timing Role: High-efficiency intermediate bus converter stepping 5V USB-C PD down to 1.05V. Use Value: Burst Mode® extends battery life >8 hours in idle state; 3mm × 3mm DFN fits tight space behind display hinge. |
Use Scenario: Powers microcontroller, ADC, and LCD in portable multimeters and oscilloscope probes. IC Role / Device Role / Timing Role: Single-chip solution replacing discrete buck + LDO for 3.3V logic and 2.5V analog rails. Use Value: 60µA quiescent current and <1µA shutdown enable multi-year battery life on CR2032 coin cells. |
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 | 3A rating, fixed 3.3V output, no SYNC/MODE pin, 2.5V–6V input, 3.5MHz max fSW | Best for fixed-output, higher-current systems where programmability is not required. | Choose TPS62130ARGTR if output voltage is fixed and 3A headroom is needed; LTC3568IDD#PBF preferred for adjustable VOUT and multi-mode operation. |
| MAX17503GCU+T | 2.5A rating, 4.5V–60V input, external MOSFETs, no integrated switches, requires more external components | Suitable for industrial 24V input systems-not compatible with low-voltage battery-powered devices. | Choose MAX17503GCU+T for wide-input industrial supplies; LTC3568IDD#PBF is optimal for compact, battery-fed consumer electronics. |
Compared with TPS62130ARGTR and MAX17503GCU+T, the LTC3568IDD#PBF uniquely balances ultra-compact size (3mm × 3mm), programmable frequency up to 4MHz, and three selectable light-load modes-making it the only option that meets height, efficiency, and flexibility requirements simultaneously in space-constrained portable designs.
Availability
LTC3568IDD#PBF is available at Aetrix Electronics and suitable for digital camera core power, cellular phone baseband supplies, and handheld instrument power management requiring stable component supply across production lifecycles.
Supply support for LTC3568IDD#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 precision power management portfolio. The company specializes in high-performance analog, mixed-signal, and power ICs for demanding applications.
The LTC3568IDD#PBF belongs to Linear's high-frequency synchronous buck converter family, designed specifically for portable electronics where board area, battery life, and transient response are critical constraints.
FAQ
What is the maximum supported switching frequency for the LTC3568IDD#PBF?
The LTC3568IDD#PBF supports up to 4MHz switching frequency, achieved by setting the RT resistor to approximately 85kΩ. This maximum is guaranteed by design but not production-tested due to duty-cycle limitations; operation above 1.15MHz requires verification of minimum on-time at target VIN/VOUT ratios per the datasheet's fO(MAX) ≈ 6.67 × (VOUT/VIN(MAX)) formula. The LTC3568IDD#PBF achieves this frequency while maintaining stable regulation and thermal performance in its 3mm × 3mm DFN package.
How does Burst Mode® operation reduce quiescent current in the LTC3568IDD#PBF?
Burst Mode® operation in the LTC3568IDD#PBF disables the main control loop intermittently when load current falls below continuous conduction threshold. The device enters sleep cycles where only the hysteretic comparator remains active, reducing gate drive activity and minimizing switching losses. This achieves a typical quiescent current of 60µA-critical for extending battery life in always-on sensors and standby circuits. The LTC3568IDD#PBF automatically transitions into and out of Burst Mode® without external intervention.
Can the LTC3568IDD#PBF synchronize to an external clock, and what are the requirements?
Yes, the LTC3568IDD#PBF can synchronize to an external clock applied to the SYNC/MODE pin. The internal oscillator frequency must be set 20% lower than the external clock frequency to ensure adequate slope compensation. During synchronization, the device operates in pulse-skipping mode, and the top switch turn-on is aligned to the rising edge of the external clock. This feature allows noise spectral concentration for easier EMI filtering in sensitive RF sections of the LTC3568IDD#PBF-based design.
What is the purpose of the separate SGND and PGND pins on the LTC3568IDD#PBF?
The LTC3568IDD#PBF separates SGND (signal ground) and PGND (power ground) to isolate high-di/dt switching currents from sensitive analog circuitry. SGND serves as the reference for VFB, ITH, and error amplifier-minimizing noise coupling into the feedback loop. PGND carries pulsed inductor return current and bottom-FET source current. Proper PCB layout requires connecting SGND components (e.g., feedback resistors, compensation network) to the SGND pin, while routing high-current paths directly to PGND and the exposed thermal pad. This separation is essential for stable regulation and low output ripple in the LTC3568IDD#PBF.
Does the LTC3568IDD#PBF require an external catch diode?
No, the LTC3568IDD#PBF does not require an external catch diode because it integrates synchronous N-channel and P-channel MOSFETs. The bottom N-channel FET replaces the traditional Schottky diode, eliminating forward voltage drop and associated conduction losses. This design improves efficiency-especially at higher loads-and reduces thermal stress. The LTC3568IDD#PBF's internal synchronous rectification also enables 100% duty cycle operation in dropout, which would not be possible with a diode-based solution.
LTC3568IDD#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)
LTC3568IDD#PBF FAQ
1.How can I place an order for LTC3568IDD#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3568IDD#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 LTC3568IDD#PBF reliable?
The price and inventory of LTC3568IDD#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3568IDD#PBF is usually 5 days.
3.What payment methods are accepted for LTC3568IDD#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3568IDD#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3568IDD#PBF?
LTC3568IDD#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3568IDD#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 LTC3568IDD#PBF?
For technical support, including LTC3568IDD#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3568IDD#PBF requirements.
6.How does Aetrix verify that LTC3568IDD#PBF is sourced from the original manufacturer or authorized distributors?
All LTC3568IDD#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 LTC3568IDD#PBF meets industry standards.
7.What is the process for return or replacement of LTC3568IDD#PBF?
All LTC3568IDD#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3568IDD#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 LTC3568IDD#PBF part is unused and in its original packaging.
Return procedure for LTC3568IDD#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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