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Analog Devices Inc. LTC3564IS5#TRPBF
- Part No.:
- LTC3564IS5#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- SOT-23-5 Thin, TSOT-23-5
- Datasheet:
-
LTC3564IS5#TRPBF.pdf
- Description:
- IC REG BUCK ADJ 1.25A TSOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:1,132
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Product details
Overview
LTC3564IS5#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–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 LTC3564IS5#TRPBF datasheet, LTC3564IS5#TRPBF pinout, LTC3564IS5#TRPBF application, or LTC3564IS5#TRPBF equivalent, key selection criteria include its 2.5V–5.5V input range, 0.6V feedback reference for low-output-voltage designs (e.g., 1.2V–2.5V), 100% duty-cycle dropout operation, integrated P/N-channel MOSFETs eliminating external Schottky diodes, and thermal protection in the –40°C to 125°C industrial temperature grade.
Technical Context
The LTC3564IS5#TRPBF employs a constant-frequency current-mode control architecture with internal slope compensation to prevent subharmonic oscillation at high duty cycles. Its patented scheme maintains full 1.25A peak inductor current capability across all duty cycles, including 100% dropout operation.
It integrates both main (P-channel) and synchronous (N-channel) power switches with typical RDS(ON) of 0.15Ω each in the S5 package. Burst Mode® operation automatically engages below ~300mA load to sustain 20μA quiescent current, while RUN pin control enables precise system-level power sequencing with 0.3V–1.5V logic-compatible thresholds.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 2.5V to 5.5V - supports single-cell Li-ion (2.7V–4.2V) and fixed 3.3V/5V rails without external LDO pre-regulation. |
| Output Current | 1.25A continuous - sufficient for core voltage regulation in cellular modems, media players, and point-of-load applications. |
| Switching Frequency | 2.25MHz (typ.) - enables use of sub-2mm × 2mm inductors and low-ESR ceramic capacitors, minimizing board area. |
| Feedback Reference | 0.6V ±2% - allows precise programming of output voltages as low as 0.6V using standard resistor dividers. |
| Quiescent Current | 20μA (active), ≤1μA (shutdown) - critical for always-on subsystems and battery-backed standby modes. |
| Duty Cycle Range | 0% to 100% - supports ultra-low dropout operation when input voltage approaches output voltage, extending usable battery range. |
| Junction Temp Range | –40°C to 125°C - qualified for industrial and automotive cabin-adjacent portable equipment. |
Pinout & Package
Package: 5-Lead Plastic TSOT-23 (S5), 1mm profile, RoHS-compliant, lead-free finish. Exposed pad not present; thermal path relies on PCB copper via leads.
| Pin | Circuit Role | Design Meaning |
|---|---|---|
| VFB (Pin 1) | Feedback Input | Connects to resistive divider midpoint; regulates output by comparing against 0.6V internal reference - enables remote sensing and precision output setting. |
| GND (Pin 2) | Power Ground | Main return path for input/output capacitors and power switches; must be low-impedance and adjacent to CIN/COUT negative terminals. |
| VIN (Pin 3) | Input Supply | Primary power input (2.5V–5.5V); requires ≥10μF ceramic decoupling directly at pin to suppress high-frequency switching noise. |
| SW (Pin 4) | Switch Node | Connection to inductor and internal P/N-MOSFET drains; carries high di/dt square-wave current - routing must minimize loop area and avoid sensitive analog traces. |
| RUN (Pin 5) | Enable Control | Logic-level input: >1.5V enables regulation, <0.3V forces shutdown (<1μA IQ); must not float - tie to VIN or microcontroller GPIO with pull-up/down as needed. |
Key Features
| Feature | Design Value |
|---|---|
| Synchronous Buck Architecture | Integrated P- and N-channel MOSFETs eliminate external Schottky diode, reducing BOM count and improving efficiency by ~5–10% at medium loads. |
| Burst Mode® Operation | Automatically reduces switching frequency and disables non-essential circuitry at light loads, sustaining 20μA IQ without compromising transient response. |
| 100% Duty Cycle Capability | Enables dropout operation down to VIN = VOUT + ILOAD × RDS(ON), maximizing runtime in Li-ion discharge tail-end (e.g., 2.7V → 1.8V). |
| Current-Mode Control with Slope Compensation | Ensures stable operation across full duty cycle range (including >50%), prevents subharmonic oscillation, and provides inherent cycle-by-cycle current limiting. |
| Overtemperature Protection | Thermal shutdown activates at ~150°C junction temperature, latching off power switches until cooldown - protects against sustained overload or poor heatsinking. |
Applications
| Cellular Telephones | Wireless Modems |
|---|---|
Use Scenario: Core voltage supply for baseband processor and RF transceiver in 4G/LTE handsets operating from single Li-ion cell. IC Role / Device Role / Timing Role: Primary buck regulator delivering 1.2V/1.8V/2.5V at up to 1.25A with fast load transient response to handle burst transmission demands. Use Value: 96% peak efficiency and 20μA quiescent current extend talk time by >15% versus legacy regulators; 2.25MHz switching avoids AM radio band interference. |
Use Scenario: Point-of-load regulation for Wi-Fi/Bluetooth SoC and memory in portable hotspot or DSL modem. IC Role / Device Role / Timing Role: High-density, low-noise DC/DC converter powering digital logic and analog PHY sections from shared 3.3V rail. Use Value: Compact TSOT-23 footprint and ceramic capacitor compatibility reduce solution size by 40% vs. discrete solutions; Burst Mode sustains >200h standby battery life. |
| Digital Still Cameras | Portable Instruments |
Use Scenario: Image sensor and ISP core supply in compact cameras requiring rapid wake-from-sleep and low-noise operation. IC Role / Device Role / Timing Role: Fast-starting synchronous buck providing 1.5V/1.8V with <400μs startup time and minimal output ripple during image capture bursts. Use Value: 100% duty cycle ensures stable output even as battery drops to 2.7V; low EMI design prevents corruption of analog sensor signals. |
Use Scenario: Power management for handheld test equipment (e.g., multimeters, spectrum analyzers) with mixed-signal ASICs and LCD displays. IC Role / Device Role / Timing Role: Industrial-grade regulator supplying multiple rails (1.2V, 1.8V, 3.3V) with robust thermal performance across –20°C to 60°C ambient. Use Value: –40°C to 125°C qualification guarantees reliability in field-deployed units; overtemperature protection prevents damage during extended high-current measurements. |
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 |
|---|---|---|---|
| TPS62231DRYR | 2.25MHz fixed frequency, 1.2A max, 0.6V ref, but only rated for –40°C to 85°C; no Burst Mode - uses PWM-only light-load control. | Lower temperature grade limits use in industrial handhelds; higher light-load IQ (~15μA) reduces battery life in always-on sensors. | Select if cost-sensitive and operating ambient stays <85°C; verify thermal margin at 1.25A in dropout. |
| MAX17503GCU+T | Adjustable 200kHz–2.2MHz, 2A max, 0.8V ref, wider 4.5V–60V input, but larger 16-pin TQFN package and higher minimum IQ (25μA). | Over-specified for Li-ion inputs; requires external compensation; better suited for 12V/24V industrial rails than portable battery systems. | Choose only if future-proofing for multi-rail input or higher current scalability is required; adds layout complexity. |
Compared with TPS62231DRYR and MAX17503GCU+T, the LTC3564IS5#TRPBF uniquely combines industrial temperature rating, true 100% duty cycle, and sub-20μA Burst Mode operation in a 5-lead TSOT-23 - making it optimal for space-constrained, battery-critical portable designs where thermal robustness and ultra-low standby power are mandatory.
Availability
LTC3564IS5#TRPBF is available at Aetrix Electronics and suitable for cellular telephones, wireless modems, and portable instruments requiring stable component supply with guaranteed long-term industrial temperature-grade availability.
Supply support for LTC3564IS5#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) is a global leader in high-performance analog, mixed-signal, and power management ICs, serving industrial, automotive, communications, and healthcare markets.
The LTC3564 belongs to Linear's µPower synchronous buck regulator product line, designed specifically for battery-powered portable electronics demanding ultra-low quiescent current, small solution size, and seamless transition between high-efficiency and ultra-low-power operating modes.
FAQ
What is the maximum output current capability of the LTC3564IS5#TRPBF?
The LTC3564IS5#TRPBF delivers up to 1.25A continuous output current under typical conditions (TA = 25°C, VIN = 3.6V, VOUT = 1.8V). Peak inductor current capability reaches 2.0A (typ.), supporting transient loads. Derating applies at elevated ambient temperatures or low input voltages due to thermal limits and RDS(ON) increase - full 1.25A is sustainable in the S5 package with adequate PCB copper area.
Does the LTC3564IS5#TRPBF require an external Schottky diode?
No, the LTC3564IS5#TRPBF does not require an external Schottky diode. It integrates both a P-channel main switch and an N-channel synchronous rectifier, enabling fully synchronous operation that eliminates conduction losses and thermal overhead associated with external diodes - confirmed in the datasheet's "No Schottky Diode Required" feature and functional diagram.
What is the function of the RUN pin on the LTC3564IS5#TRPBF?
The RUN pin on the LTC3564IS5#TRPBF is a logic-controlled enable input. Driving it above 1.5V (typ.) enables regulation; pulling it below 0.3V (typ.) places the device in shutdown mode, reducing supply current to ≤1μA. It must never be left floating - tie to VIN through a resistor or drive actively from a microcontroller GPIO to ensure deterministic power sequencing.
Can the LTC3564IS5#TRPBF operate with a 2.7V input and 1.8V output?
Yes, the LTC3564IS5#TRPBF supports 2.7V input and 1.8V output reliably. Its 100% duty cycle capability allows dropout operation where VIN ≈ VOUT, and its 2.5V–5.5V input range fully covers this condition. At 2.7V/1.8V, efficiency remains >85% at 1A load, and thermal performance is verified per θJA = 215°C/W for the S5 package - confirmed in Typical Performance Characteristics Figure G01 and G02.
What package type and dimensions does the LTC3564IS5#TRPBF use?
The LTC3564IS5#TRPBF uses the 5-Lead Plastic TSOT-23 (S5) package: 2.9mm × 1.6mm × 1.0mm body size with 0.95mm pitch. Pin 1 is marked with a dot; pinout is VFB–GND–VIN–SW–RUN (top view). This low-profile package is optimized for space-constrained portable PCBs and supports standard reflow soldering per JEDEC J-STD-020.
LTC3564IS5#TRPBF 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#TRPBF FAQ
1.How can I place an order for LTC3564IS5#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3564IS5#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 LTC3564IS5#TRPBF reliable?
The price and inventory of LTC3564IS5#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3564IS5#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC3564IS5#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3564IS5#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3564IS5#TRPBF?
LTC3564IS5#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3564IS5#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 LTC3564IS5#TRPBF?
For technical support, including LTC3564IS5#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3564IS5#TRPBF requirements.
6.How does Aetrix verify that LTC3564IS5#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC3564IS5#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 LTC3564IS5#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC3564IS5#TRPBF?
All LTC3564IS5#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3564IS5#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 LTC3564IS5#TRPBF part is unused and in its original packaging.
Return procedure for LTC3564IS5#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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