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Analog Devices Inc. LTC3564ES5#TRMPBF
- Part No.:
- LTC3564ES5#TRMPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- SOT-23-5 Thin, TSOT-23-5
- Datasheet:
-
LTC3564ES5#TRMPBF.pdf
- Description:
- IC REG BUCK ADJ 1.25A TSOT23-5
- Quantity:
- Payment:
- Shipping:
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Product details
Overview
LTC3564ES5#TRMPBF from Analog Devices (formerly Linear Technology) is a monolithic synchronous step-down DC/DC regulator optimized for single-cell Li-Ion and 3.3V–5V input systems. It delivers up to 1.25A output current with 96% peak efficiency, 20μA quiescent current in active mode, and operates at a fixed 2.25MHz switching frequency to enable compact 1.1μH inductor and ceramic capacitor designs. Its 0.6V feedback reference supports low-output-voltage regulation down to 0.6V.
For engineers reviewing the LTC3564ES5#TRMPBF datasheet, LTC3564ES5#TRMPBF pinout, LTC3564ES5#TRMPBF application, or LTC3564ES5#TRMPBF equivalent, this page provides verified package mapping (5-lead TSOT-23), confirmed current-mode control architecture, validated Burst Mode® operation for ultra-low-load efficiency, and real-world thermal derating guidance for dropout conditions at 100% duty cycle.
Technical Context
The LTC3564ES5#TRMPBF implements a constant-frequency, current-mode synchronous buck architecture with integrated P-channel main and N-channel synchronous MOSFETs. Its internal 0.6V reference, slope-compensated current sensing, and patented peak-current preservation scheme ensure stability across all duty cycles-including 100% dropout operation-without external compensation.
Burst Mode® operation enables automatic transition between continuous conduction mode and intermittent pulse-bursting, reducing quiescent current to 20μA at light loads while maintaining tight output regulation. Overtemperature protection disables both switches above ~150°C, and shutdown mode draws ≤1μA supply current with RUN pin pulled below 0.3V.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 2.5V to 5.5V - supports full discharge range of single Li-Ion (2.7V–4.2V) and standard 3.3V/5V rails without external LDO pre-regulation. |
| Output Current | 1.25A continuous - sufficient for core logic, RF transceivers, and imaging sensors in portable devices. |
| Switching Frequency | 2.25MHz (typ.) - enables use of sub-1.2μH inductors and small 22μF ceramic input/output capacitors, minimizing board area. |
| Quiescent Current | 20μA (active), ≤1μA (shutdown) - extends battery runtime in standby and sleep modes of cellular phones and media players. |
| Feedback Reference | 0.6V ±2% - allows precise, low-noise output voltage programming from 0.6V to 5.5V using standard resistor dividers. |
| Efficiency Peak | 96% - achieved at mid-load (e.g., 500mA @ 1.8V out, 3.6V in), minimizing thermal stress and enabling fanless design. |
| RDS(ON) (P-FET) | 0.15Ω (typ., S5 package) - limits conduction loss during dropout; junction temperature rise must be calculated per θJA = 215°C/W. |
Pinout & Package
Package: 5-Lead Plastic TSOT-23 (S5), 1mm profile, RoHS-compliant, lead-free finish. Exposed pad not present - standard plastic body.
| Pin | Circuit Role | Design Meaning |
|---|---|---|
| VFB (Pin 1) | Feedback Input | Connects to resistive divider midpoint; regulates output by comparing against 0.6V internal reference - requires Kelvin connection to COUT(+) for remote sensing. |
| GND (Pin 2) | Power Ground | Main return path for high-current SW node and input/output capacitors; must be low-inductance, solid copper pour tied to PGND plane. |
| VIN (Pin 3) | Main Power Input | Supplies internal circuitry and power switches; requires ≥10μF ceramic decoupling placed within 2mm of pin to minimize switching noise and VIN droop. |
| SW (Pin 4) | Switch Node | Drain connection of internal P-FET and N-FET; carries high di/dt square-wave current - must be short, wide, and isolated from VFB/Run traces. |
| RUN (Pin 5) | Enable Control | Logic-level input: >1.5V enables regulation; <0.3V forces shutdown (≤1μA IQ); floating state is undefined and must be avoided via pull-up/down. |
Key Features
| Feature | Design Value |
|---|---|
| Synchronous rectification | Eliminates external Schottky diode - reduces BOM count, improves efficiency by ~5% at 1A, and avoids reverse-recovery losses. |
| 100% duty cycle operation | Enables dropout regulation down to VIN – ILOAD × RDS(ON) - critical for maximizing battery life in portable instruments near end-of-discharge. |
| Burst Mode® regulation | Reduces IQ to 20μA at light loads while maintaining ±1% output accuracy - prevents audible capacitor ringing and extends runtime in standby. |
| Internal slope compensation | Patented scheme preserves maximum inductor peak current across all duty cycles - avoids subharmonic oscillation without sacrificing current limit. |
| Overtemperature protection | Thermal shutdown at ~150°C junction temperature - latches off both FETs until cooldown, preventing permanent damage during sustained overload. |
Applications
| Cellular Telephones | Wireless Modems |
|---|---|
Use Scenario: Core voltage rail (1.2V–2.5V) for baseband processor and PMIC in GSM/UMTS/LTE handsets powered by single Li-Ion battery. IC Role / Device Role / Timing Role: Primary synchronous buck regulator delivering 1.25A with fast load transient response to handle burst-mode TX/RX current spikes. Use Value: 96% efficiency at 1A and 20μA quiescent current directly extend talk time and standby duration beyond competing 1.5A regulators with higher IQ. |
Use Scenario: Point-of-load regulator for Wi-Fi/Bluetooth SoC in DSL/cable modems requiring stable 1.8V or 3.3V from 5V system rail. IC Role / Device Role / Timing Role: Compact, high-frequency DC/DC converter enabling dense PCB layouts with minimal EMI filtering due to 2.25MHz fixed-frequency operation. Use Value: 2.25MHz switching allows use of 1.1μH inductor and 22μF ceramic caps - reduces solution size by >40% vs 500kHz alternatives without sacrificing transient performance. |
| Digital Still Cameras | Portable Instruments |
Use Scenario: Image sensor bias supply (1.2V–1.8V) in compact digital cameras where rapid wake-from-sleep and low-noise regulation are essential. IC Role / Device Role / Timing Role: Low-quiescent-current buck regulator supporting fast start-up (<1ms) and clean output during image capture bursts. Use Value: Burst Mode® operation maintains <1% output ripple at 100μA load while drawing only 20μA - eliminates visible banding in captured images caused by switching noise. |
Use Scenario: Main logic supply (1.2V–3.3V) in handheld test equipment (multimeters, spectrum analyzers) operating from rechargeable Li-Ion packs. IC Role / Device Role / Timing Role: High-efficiency, thermally robust regulator sustaining 1.25A under continuous measurement load at elevated ambient temperatures. Use Value: 100% duty cycle capability and validated thermal model (θJA = 215°C/W) allow reliable operation down to 2.7V input - avoids brownout during battery discharge. |
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 light-load control. | Lacks Burst Mode®'s ultra-low IQ at microamp loads; less suitable for multi-day standby in battery-powered IoT nodes. | Prefer LTC3564ES5#TRMPBF when >20% longer battery life at light loads is required and layout space permits identical 5-pin TSOT-23 footprint. |
| MAX8640YETA+ | 2.25MHz, 1.2A, 0.6V ref, 22μA IQ, but rated only to 85°C ambient - no guaranteed operation at 125°C junction. | Not qualified for extended industrial temperature range; thermal derating required above 70°C ambient. | Select LTC3564ES5#TRMPBF for applications requiring full –40°C to +125°C junction operation with documented thermal resistance (θJA = 215°C/W). |
Compared with TPS62231DRVR and MAX8640YETA+, the LTC3564ES5#TRMPBF offers superior light-load efficiency via Burst Mode®, guaranteed 125°C junction operation, and lower typical quiescent current - making it optimal for portable Li-Ion systems demanding maximum runtime and thermal margin.
Availability
LTC3564ES5#TRMPBF is available at Aetrix Electronics and suitable for cellular telephones, wireless modems, digital still cameras, and portable instruments requiring stable component supply with long-term lifecycle support.
Supply support for LTC3564ES5#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, Inc. (acquired Linear Technology in 2017) is a global leader in high-performance analog, mixed-signal, and power management semiconductors.
The LTC3564ES5#TRMPBF belongs to Linear's µPower synchronous buck regulator family, designed specifically for battery-powered portable electronics where ultra-low quiescent current, small solution size, and robust dropout performance are mandatory.
FAQ
What is the maximum output current capability of the LTC3564ES5#TRMPBF?
The LTC3564ES5#TRMPBF delivers up to 1.25A continuous output current under typical conditions (TA = 25°C, VIN = 3.6V, VOUT = 1.8V). Derating is required at elevated ambient temperatures or low input voltages due to thermal limits - for example, at 70°C ambient and 2.7V input, maximum sustainable current drops to ~1.0A based on θJA = 215°C/W and RDS(ON) = 0.2Ω.
Does the LTC3564ES5#TRMPBF require an external Schottky diode?
No, the LTC3564ES5#TRMPBF does not require an external Schottky diode. It integrates both a P-channel main switch and an N-channel synchronous rectifier, enabling full synchronous rectification. This eliminates reverse-recovery losses and reduces total solution size and cost compared to asynchronous buck converters.
What package type is used for the LTC3564ES5#TRMPBF?
The LTC3564ES5#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 plastic body with no exposed thermal pad - unlike the DFN variant (LTC3564EDCB#TRMPBF) which includes an exposed SGND pad.
How does Burst Mode® operation improve efficiency in the LTC3564ES5#TRMPBF?
Burst Mode® operation in the LTC3564ES5#TRMPBF reduces quiescent current to 20μA at light loads by disabling the power switches and non-essential circuitry between regulated output pulses. Each burst supplies just enough energy to maintain regulation, minimizing switching and gate-drive losses - resulting in >85% efficiency even at 100μA load, far exceeding PWM-only alternatives.
What is the recommended input capacitor for the LTC3564ES5#TRMPBF?
The recommended input capacitor for the LTC3564ES5#TRMPBF is a ≥10μF X5R or X7R ceramic capacitor placed within 2mm of the VIN and GND pins. A 22μF/6.3V ceramic (e.g., Taiyo Yuden JMK316BJ226ML) is commonly used to handle RMS currents up to 0.6A and suppress high-frequency switching noise - aluminum or tantalum caps are not required due to the regulator's ESR-independent loop stability.
LTC3564ES5#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
LTC3564ES5#TRMPBF FAQ
1.How can I place an order for LTC3564ES5#TRMPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3564ES5#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 LTC3564ES5#TRMPBF reliable?
The price and inventory of LTC3564ES5#TRMPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3564ES5#TRMPBF is usually 5 days.
3.What payment methods are accepted for LTC3564ES5#TRMPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3564ES5#TRMPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3564ES5#TRMPBF?
LTC3564ES5#TRMPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3564ES5#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 LTC3564ES5#TRMPBF?
For technical support, including LTC3564ES5#TRMPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3564ES5#TRMPBF requirements.
6.How does Aetrix verify that LTC3564ES5#TRMPBF is sourced from the original manufacturer or authorized distributors?
All LTC3564ES5#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 LTC3564ES5#TRMPBF meets industry standards.
7.What is the process for return or replacement of LTC3564ES5#TRMPBF?
All LTC3564ES5#TRMPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3564ES5#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 LTC3564ES5#TRMPBF part is unused and in its original packaging.
Return procedure for LTC3564ES5#TRMPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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