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Analog Devices Inc. LTC3564IS5#TRMPBF
- Part No.:
- LTC3564IS5#TRMPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- SOT-23-5 Thin, TSOT-23-5
- Datasheet:
-
LTC3564IS5#TRMPBF.pdf
- Description:
- IC REG BUCK ADJ 1.25A TSOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:376
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Product details
Overview
LTC3564IS5#TRMPBF from Analog Devices (formerly Linear Technology) is a high-efficiency, constant-frequency, current-mode synchronous step-down regulator optimized for single Li-Ion or 3.3V/5V input systems. It delivers up to 1.25A output current with 20μA quiescent current, 2.25MHz switching frequency, and 0.6V internal reference-enabling low-output-voltage regulation in space-constrained portable electronics.
For engineers reviewing the LTC3564IS5#TRMPBF datasheet, LTC3564IS5#TRMPBF pinout, LTC3564IS5#TRMPBF application, or LTC3564IS5#TRMPBF equivalent, key selection criteria include its 2.5V–5.5V input range, 100% duty-cycle dropout capability, Burst Mode® operation for ultra-low-load efficiency, and compatibility with small 1.1μH inductors and ceramic capacitors in TSOT-23 packaging.
Technical Context
The LTC3564IS5#TRMPBF implements a constant-frequency current-mode control architecture with integrated P-channel main and N-channel synchronous switches. Its 2.25MHz fixed oscillator enables compact external components, while slope compensation prevents subharmonic oscillation above 40% duty cycle without reducing peak inductor current.
Burst Mode® operation activates automatically at light loads, reducing supply current to 20μA by intermittently enabling switching cycles; shutdown draws ≤1μA. Overtemperature protection disables both switches when junction temperature exceeds ~150°C, and 100% duty-cycle operation sustains regulation down to VIN ≈ VOUT + ILOAD × RDS(ON).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 2.5V to 5.5V - supports single-cell Li-ion (2.7–4.2V) and fixed 3.3V/5V rails without external LDO pre-regulation. |
| Output Current | 1.25A continuous - sufficient for core logic, RF transceivers, or display drivers in handheld devices. |
| Switching Frequency | 2.25MHz (typ.) - allows use of sub-1.5mm-height 1.1μH inductors and reduces output capacitor size. |
| Quiescent Current | 20μA in active Burst Mode® - extends battery runtime during standby or sleep states in portable instruments. |
| Feedback Reference | 0.6V ±2% - enables precise 1.2V, 1.5V, 1.8V, or 2.5V outputs using standard resistor ratios; supports remote sensing. |
| Efficiency Peak | 96% at mid-load - achieved via synchronous rectification (no Schottky diode required) and low RDS(ON) (0.15Ω typ. each switch). |
| Shutdown Current | ≤1μA - ensures negligible battery drain during system power-off or deep-sleep modes. |
| Operating Temp Range | –40°C to +125°C (junction) - qualified for industrial and extended-temperature portable applications. |
Pinout & Package
Package: 5-Lead Plastic TSOT-23 (S5), 1mm profile, RoHS-compliant, lead-free finish. Exposed pad not present in S5 package.
| Pin | Circuit Role | Design Meaning |
|---|---|---|
| VFB (Pin 1) | Feedback Input | Connects to resistive divider across VOUT; regulates output by comparing against 0.6V internal reference. |
| GND (Pin 2) | Ground Reference | Power ground return for internal circuitry and SW node path; must be low-impedance connection to CIN/COUT (–) terminals. |
| VIN (Pin 3) | Main Power Input | Supplies internal bias and switch drivers; requires ≥10μF ceramic decoupling close to pin to minimize AC ripple and EMI. |
| SW (Pin 4) | Switch Node | Drain connection of internal P- and N-channel MOSFETs; routes high di/dt current to external inductor; sensitive to layout parasitics. |
| RUN (Pin 5) | Enable Control | Logic-level input: >1.5V enables regulation; <0.3V forces shutdown (≤1μA IQ); must not be left floating. |
Key Features
| Feature | Design Value |
|---|---|
| Synchronous Buck Architecture | Eliminates external Schottky diode, improving efficiency by ~5–10% and reducing thermal load in 1.25A applications. |
| Burst Mode® Operation | Reduces no-load input current to 20μA while maintaining tight output regulation-critical for battery life in always-on sensors. |
| 100% Duty-Cycle Capability | Extends usable battery voltage down to VOUT + ILOAD×RDS(ON), delaying brownout in Li-ion discharge tail. |
| Internal 0.6V Reference | Enables stable 1.2V–5.5V outputs with standard 1% resistors; supports remote feedback for improved load regulation. |
| Overtemperature Protection | Thermal shutdown disables both switches at ~150°C junction, preventing permanent damage during sustained overload or poor heatsinking. |
| 2.25MHz Fixed Frequency | Permits use of tiny, low-profile inductors (e.g., 1.1μH) and ceramic capacitors-reducing board area by >40% vs. 500kHz solutions. |
Applications
| Cellular Telephones | Wireless Modems |
|---|---|
Use Scenario: Core voltage regulation for baseband processor and RF transceiver in LTE/5G handsets operating from single Li-ion cell (2.7–4.2V). IC Role / Device Role / Timing Role: Primary buck converter delivering 1.2V/1.8V at up to 1.25A with dynamic load transient response under burst traffic conditions. Use Value: Burst Mode® maintains 20μA quiescent current during idle, extending standby time; 2.25MHz switching avoids AM radio band interference. |
Use Scenario: Point-of-load regulation for Wi-Fi/Bluetooth SoC and PHY in compact DSL or cable modems powered from 3.3V or 5V rail. IC Role / Device Role / Timing Role: High-efficiency DC-DC converter supplying 1.5V/1.8V to digital logic with fast line/load transient recovery. Use Value: 96% peak efficiency minimizes heat in sealed enclosures; 100% duty cycle sustains output as input sags under heavy Ethernet load. |
| Digital Still Cameras | Portable Instruments |
Use Scenario: Powering image sensor, ISP, and flash controller in battery-operated DSLR or mirrorless cameras with rapid on/off cycling. IC Role / Device Role / Timing Role: Main system regulator providing 2.5V/3.3V with <100μs startup from shutdown and low-noise operation during image capture. Use Value: ≤1μA shutdown current preserves battery charge between shots; low-profile TSOT-23 fits tight camera module layouts. |
Use Scenario: Supplying microcontroller, ADC, and display in handheld test equipment (e.g., multimeters, spectrum analyzers) running on AA/AAA or Li-ion. IC Role / Device Role / Timing Role: Low-quiescent-current buck regulator delivering stable 3.3V from 4.5–5.5V input with minimal thermal drift. Use Value: 0.4%/V line regulation and ±2% reference accuracy ensure measurement integrity; –40°C to +125°C rating supports field deployment. |
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 |
|---|---|---|---|
| TPS62231DRYT | 2.25MHz, 1.2A, 2.05–6.5V input; 18μA IQ in PWM mode only; no Burst Mode®; 0.6V ref; DSBGA-6 package (1.0×1.0mm). | Higher minimum input voltage limits use with discharged Li-ion (<2.5V); lacks 100% duty cycle for true dropout. | Prefer for ultra-small footprint where input stays ≥2.05V; avoid if battery sag below 2.5V is expected. |
| MAX17503GCU+T | 2.2MHz, 1.2A, 4.5–36V input; 120μA IQ; adjustable soft-start; 0.8V ref; 16-pin TQFN; requires external MOSFETs. | Wider input range suits industrial 12V/24V systems but overqualified for 3.3V/Li-ion; higher IQ reduces battery life. | Select only for multi-rail designs requiring 4.5–36V operation; not drop-in for portable Li-ion applications. |
Compared with TPS62231DRYT and MAX17503GCU+T, the LTC3564IS5#TRMPBF uniquely combines Li-ion-compatible 2.5V min input, 100% duty cycle, 20μA Burst Mode® IQ, and TSOT-23 packaging-making it optimal for space- and battery-life-constrained portable designs.
Availability
LTC3564IS5#TRMPBF is available at Aetrix Electronics and suitable for cellular telephones, wireless modems, and portable instruments requiring stable component supply with guaranteed long-term availability and full traceability.
Supply support for LTC3564IS5#TRMPBF 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 all Linear ICs including the LTC series.
The LTC3564 belongs to Linear's high-efficiency monolithic DC/DC regulator family, designed specifically for battery-powered portable electronics demanding ultra-low quiescent current, small solution size, and robust transient performance.
FAQ
What is the maximum output current capability of the LTC3564IS5#TRMPBF?
The LTC3564IS5#TRMPBF delivers up to 1.25A continuous output current under typical conditions (TA = 25°C, 2.25MHz, VIN = 3.6V, VOUT = 1.8V). Derating applies at elevated ambient temperatures or high duty cycles; thermal design must ensure junction temperature remains ≤125°C using the S5 package's θJA = 215°C/W.
Does the LTC3564IS5#TRMPBF require an external Schottky diode?
No, the LTC3564IS5#TRMPBF does not require an external Schottky diode. It integrates both a P-channel main switch and an N-channel synchronous switch, enabling full synchronous rectification and eliminating conduction losses associated with external diodes.
What is the purpose of Burst Mode® operation in the LTC3564IS5#TRMPBF?
Burst Mode® operation in the LTC3564IS5#TRMPBF reduces quiescent current to 20μA at light loads by intermittently enabling switching cycles, significantly extending battery runtime in standby or low-power states while maintaining tight output voltage regulation.
Can the LTC3564IS5#TRMPBF operate with input voltage equal to the output voltage?
Yes, the LTC3564IS5#TRMPBF supports 100% duty-cycle operation, allowing it to maintain regulation when input voltage drops to within ILOAD × RDS(ON) of the output voltage-critical for maximizing usable capacity from Li-ion batteries in dropout conditions.
What package type is used for the LTC3564IS5#TRMPBF?
The LTC3564IS5#TRMPBF uses the 5-lead plastic TSOT-23 (S5) package, measuring 2.9mm × 1.6mm × 1.0mm with a 0.95mm pitch. It features a standard pinout (VFB-GND-VIN-SW-RUN) and is compatible with automated pick-and-place and reflow soldering processes.
LTC3564IS5#TRMPBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- SOT-23-5 Thin, TSOT-23-5
- 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:
- TSOT-23-5
LTC3564IS5#TRMPBF FAQ
1.How can I place an order for LTC3564IS5#TRMPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3564IS5#TRMPBF 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 LTC3564IS5#TRMPBF reliable?
The price and inventory of LTC3564IS5#TRMPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3564IS5#TRMPBF is usually 5 days.
3.What payment methods are accepted for LTC3564IS5#TRMPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3564IS5#TRMPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3564IS5#TRMPBF?
LTC3564IS5#TRMPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3564IS5#TRMPBF 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 LTC3564IS5#TRMPBF?
For technical support, including LTC3564IS5#TRMPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3564IS5#TRMPBF requirements.
6.How does Aetrix verify that LTC3564IS5#TRMPBF is sourced from the original manufacturer or authorized distributors?
All LTC3564IS5#TRMPBF 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 LTC3564IS5#TRMPBF meets industry standards.
7.What is the process for return or replacement of LTC3564IS5#TRMPBF?
All LTC3564IS5#TRMPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3564IS5#TRMPBF, 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 LTC3564IS5#TRMPBF part is unused and in its original packaging.
Return procedure for LTC3564IS5#TRMPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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