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Analog Devices Inc. LTC3564IDCB#TRPBF
- Part No.:
- LTC3564IDCB#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 6-WFDFN Exposed Pad
- Datasheet:
-
LTC3564IDCB#TRPBF.pdf
- Description:
- IC REG BUCK ADJ 1.25A 6DFN
- Quantity:
- Payment:
- Shipping:
Inventory:3,747
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Product details
Overview
LTC3564IDCB#TRPBF from Analog Devices (formerly Linear Technology) is a high-efficiency, constant-frequency, current-mode synchronous step-down DC/DC regulator optimized for single Li-Ion or 3.3V–5.5V input systems. It delivers up to 1.25A output current with 96% peak efficiency, 20μA quiescent current in active mode, and ≤1μA shutdown current - enabling extended battery life in portable electronics. Its 2.25MHz switching frequency supports compact 1.1μH inductors and ceramic capacitors.
For engineers reviewing the LTC3564IDCB#TRPBF datasheet, LTC3564IDCB#TRPBF pinout, LTC3564IDCB#TRPBF application, or LTC3564IDCB#TRPBF equivalent, key selection criteria include its 0.6V reference for low-output-voltage regulation (e.g., 1.2V–3.3V), 100% duty-cycle dropout operation, integrated P/N-channel MOSFETs eliminating external Schottky diodes, and thermal performance in the 6-lead DFN package (θJA = 64°C/W).
Technical Context
The LTC3564IDCB#TRPBF employs a proprietary current-mode control architecture with internal slope compensation that maintains stable operation across all duty cycles - including >40% - without reducing peak inductor current. Its Burst Mode® operation dynamically disables switching circuitry during light loads, reducing supply current to 20μA while sustaining regulation.
It integrates both main (P-channel) and synchronous (N-channel) power switches with matched RDS(ON) of 0.15Ω (typ) per FET in the DFN package. Overtemperature protection shuts down both switches when junction temperature exceeds ~150°C, and short-circuit behavior includes extended bottom-FET conduction to safely decay inductor current.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 2.5V to 5.5V - supports full discharge range of single-cell Li-Ion (2.7V–4.2V) and fixed 3.3V/5V rails. |
| Output Current | 1.25A continuous - sufficient for core logic, RF transceivers, or display drivers in handheld devices. |
| Switching Frequency | 2.25MHz (typ) - enables use of sub-2mm surface-mount inductors and minimizes EMI filter size. |
| Feedback Reference | 0.6V ±2% - allows precise, low-noise output voltage setting from 0.6V to 5.5V via external resistor divider. |
| Quiescent Current | 20μA (active), ≤1μA (shutdown) - critical for always-on subsystems and battery runtime extension. |
| Duty Cycle Range | 0% to 100% - supports ultra-low dropout operation when input approaches output voltage. |
| Thermal Resistance | θJA = 64°C/W (DFN) - requires minimal PCB copper area for thermal management at full load. |
Pinout & Package
Package: 6-Lead (2mm × 3mm) Plastic DFN with exposed pad (Pin 7 = SGND), 1mm profile, RoHS-compliant, tape-and-reel packaging.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN (Pin 3) | Main power input | Accepts 2.5V–5.5V; must be decoupled with ≥10μF ceramic capacitor close to pin and PGND. |
| SW (Pin 1) | Switch node | Connects to inductor; carries high dv/dt square wave - routing must avoid sensitive analog nodes (e.g., VFB). |
| VFB (Pin 4) | Feedback input | Monitors output via resistive divider; 0.6V reference sets regulation point; high-impedance (±30nA bias). |
| PGND (Pin 2) | Power ground | Return path for CIN, COUT, and inductor; must be low-inductance connection to exposed pad. |
| RUN (Pin 6) | Enable control | Active-high: >1.5V enables, <0.3V disables; draws ≤1μA in shutdown; must not float. |
| SGND (Pins 5, 7) | Signal ground | Reference for VFB, RUN, and internal error amplifier; separate from PGND to minimize noise coupling. |
Key Features
| Feature | Design Value |
|---|---|
| Synchronous rectification | Eliminates external Schottky diode - reduces BOM count, improves efficiency by ~3–5% at medium loads. |
| Burst Mode® operation | Reduces quiescent current to 20μA at light loads while maintaining tight output regulation (<±1% line/load). |
| 100% duty cycle capability | Extends usable battery life by regulating down to VIN – ILOAD×RDS(ON) - e.g., 2.7V input → 2.5V output at 1.25A with 0.15Ω RDS(ON). |
| Integrated slope compensation | Maintains loop stability at high duty cycles without sacrificing peak inductor current or requiring external components. |
| Overtemperature protection | Shuts down both MOSFETs above ~150°C junction temperature - prevents thermal runaway during overload or poor heatsinking. |
Applications
| Cellular Telephones | Wireless Modems |
|---|---|
Use Scenario: Powering baseband processor and RF transceiver from single Li-Ion cell (2.7V–4.2V). IC Role / Device Role / Timing Role: Primary buck regulator delivering 1.2V/1.8V/2.5V core and I/O supplies with fast transient response to burst traffic. Use Value: 96% efficiency at 500mA and 20μA quiescent current extend talk time and standby duration beyond competing 2MHz regulators. |
Use Scenario: Supplying 3.3V to LTE/Wi-Fi chipset and PMU in compact broadband modem. IC Role / Device Role / Timing Role: Point-of-load regulator with 2.25MHz switching enabling small 1.0μH inductor and 22μF ceramic output cap. Use Value: Low-profile DFN package (2mm × 3mm × 1mm) fits constrained board space; Burst Mode® sustains >85% efficiency down to 1mA load. |
| Digital Still Cameras | Portable Instruments |
Use Scenario: Generating 1.8V for image sensor and 3.3V for memory interface in battery-powered DSLR or mirrorless camera. IC Role / Device Role / Timing Role: Dual-rail power source with independent soft-start timing (0.9ms typ) preventing inrush-induced system reset. Use Value: 100% duty cycle operation maintains 1.8V output even as battery drops to 2.0V - avoids premature brownout shutdown. |
Use Scenario: Regulating 2.5V for precision ADC/DAC and microcontroller in handheld test equipment. IC Role / Device Role / Timing Role: Low-noise, high-PSRR buck converter where VFB node isolation and SGND/PGND separation minimize measurement error. Use Value: 0.6V reference and ±0.4%/V line regulation ensure <±0.5% output accuracy over full input range - critical for calibrated instruments. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar synchronous step-down regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS62231DRVR | 2.25MHz, 1.2A, 0.6V ref, but 25μA IQ (vs 20μA); no Burst Mode - uses PWM-only at light loads. | Higher light-load power loss; less suitable for multi-day battery standby. | Prefer LTC3564IDCB#TRPBF when >100-hour standby is required and layout allows DFN thermal pad soldering. |
| MAX17503GTA+ | 2.2MHz, 1.5A, wider 4.5V–60V input, but 100μA IQ and larger 16-pin TQFN package. | Designed for industrial/high-voltage inputs - over-specified for Li-Ion portable apps. | Choose LTC3564IDCB#TRPBF for cost-sensitive, space-constrained, single-cell battery designs prioritizing ultra-low IQ. |
Compared with TPS62231DRVR and MAX17503GTA+, the LTC3564IDCB#TRPBF delivers superior light-load efficiency via Burst Mode®, lower quiescent current, and smaller footprint - making it optimal for portable Li-Ion systems where battery runtime and PCB area are critical constraints.
Availability
LTC3564IDCB#TRPBF is available at Aetrix Electronics and suitable for cellular telephones, wireless modems, digital still cameras, and portable instrumentation requiring stable component supply with guaranteed long-term availability.
Supply support for LTC3564IDCB#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 full product support, documentation, and manufacturing continuity for the LTC portfolio.
The LTC3564 belongs to Linear's high-efficiency, high-frequency monolithic buck regulator family - designed specifically for space- and power-constrained portable electronics operating from single-cell Li-Ion or low-voltage fixed rails.
FAQ
What is the maximum output current capability of the LTC3564IDCB#TRPBF?
The LTC3564IDCB#TRPBF is rated for 1.25A continuous output current under typical conditions (TA ≤ 85°C, proper PCB thermal design). Peak inductor current reaches 2.0A (typ), supporting transient loads. Derating is required above 85°C ambient or with inadequate copper pour on the exposed thermal pad (Pin 7/SGND).
Does the LTC3564IDCB#TRPBF require an external Schottky diode?
No. The LTC3564IDCB#TRPBF integrates both P-channel main and N-channel synchronous rectifier MOSFETs, eliminating the need for an external Schottky diode. This reduces component count, PCB area, and conduction losses - contributing to its 96% peak efficiency.
How does Burst Mode® operation improve battery life in the LTC3564IDCB#TRPBF?
Burst Mode® reduces the LTC3564IDCB#TRPBF's quiescent current to 20μA during light loads by intermittently disabling switching and bias circuitry. This extends battery runtime significantly - e.g., in cellular phone standby mode - while maintaining output regulation within ±1%, unlike skip-cycle modes that cause higher output ripple.
What is the recommended minimum output capacitance for stable operation of the LTC3564IDCB#TRPBF?
The LTC3564IDCB#TRPBF is stable with ceramic output capacitors ≥22μF (X5R/X7R dielectric). Lower ESR improves transient response and reduces output ripple (ΔVOUT ≈ ΔIL × ESR + ΔIL/(8 × f × COUT)). For 1.25A loads, 22μF–47μF is typical; tantalum or polymer caps may be used if ESR > 10mΩ is acceptable.
Can the LTC3564IDCB#TRPBF operate with 100% duty cycle, and what are the implications?
Yes - the LTC3564IDCB#TRPBF supports 100% duty cycle to maintain regulation as input voltage drops near the output level. In this mode, output voltage equals VIN minus ILOAD × RDS(ON) (0.15Ω typ). Power dissipation rises sharply; thermal analysis is essential - e.g., at 1.2A and 2.7VIN, PD ≈ 216mW, requiring θJA < 58°C/W to stay below 125°C junction.
LTC3564IDCB#TRPBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 6-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):
- 0.6V
- Voltage - Output (Max):
- 5.5V
- Current - Output:
- 1.25A
- Frequency - Switching:
- 2.25MHz
- Synchronous Rectifier:
- Yes
- Operating Temperature:
- -40°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 6-DFN (2x3)
LTC3564IDCB#TRPBF FAQ
1.How can I place an order for LTC3564IDCB#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3564IDCB#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 LTC3564IDCB#TRPBF reliable?
The price and inventory of LTC3564IDCB#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3564IDCB#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC3564IDCB#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3564IDCB#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3564IDCB#TRPBF?
LTC3564IDCB#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3564IDCB#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 LTC3564IDCB#TRPBF?
For technical support, including LTC3564IDCB#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3564IDCB#TRPBF requirements.
6.How does Aetrix verify that LTC3564IDCB#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC3564IDCB#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 LTC3564IDCB#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC3564IDCB#TRPBF?
All LTC3564IDCB#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3564IDCB#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 LTC3564IDCB#TRPBF part is unused and in its original packaging.
Return procedure for LTC3564IDCB#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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