LTC3564

PRODUCTION

2.25MHz, 1.25A Synchronous Step-Down Regulator

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Overview

  • High Efficiency: Up to 96%
  • Very Low Quiescent Current: Only 20μA
  • 1.25A Output Current
  • 2.5V to 5.5V Input Voltage Range
  • 2.25MHz Constant Frequency Operation
  • No Schottky Diode Required
  • Low Dropout Operation: 100% Duty Cycle
  • 0.6V Reference Allows Low Output Voltages
  • Shutdown Mode Draws ≤ 1μA Supply Current
  • Current Mode Operation for Excellent Line and
  • Load Transient Response
  • Overtemperature Protected
  • Low Profile (1mm) ThinSOT™ and 6-Lead (2mm × 3mm) DFN Packages

The LTC3564 is a high efficiency monolithic synchronous buck regulator using a constant frequency, current mode architecture. Supply current during operation is only 20μA, dropping to ≤1μA in shutdown. The 2.5V to 5.5V input voltage range makes the LTC3564 ideally suited for single Li-Ion battery-powered or 3.3V to 5V input voltage applications. 100% duty cycle provides low drop- out operation, extending battery life in portable systems. Automatic Burst Mode® operation increases efficiency at light loads, further extending battery runtime.

Switching frequency is internally set at 2.25MHz, allowing the use of small surface mount inductors and capacitors.

The internal synchronous switch increases efficiency and eliminates the need for an external Schottky diode. Low output voltages are easily supported with the 0.6V feedback reference voltage. The LTC3564 is available in low profile (1mm) ThinSOT and 6-Lead (2mm × 3mm) DFN packages.

Applications

  • Cellular Telephones
  • Wireless and DSL Modems
  • Digital Still Cameras
  • Media Players
  • Portable Instruments
  • Point of Load Regulation
LTC3564
2.25MHz, 1.25A Synchronous Step-Down Regulator
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Documentation

Data Sheet 1

Reliability Data 1

User Guide 2

Technical Articles 1

Data Sheet

This is the most up-to-date revision of the Data Sheet.

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Software Resources

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Hardware Ecosystem

Parts Product Life Cycle Description
Power System Management (PSM) & Sequencers 1
LTC2974
RECOMMENDED FOR NEW DESIGNS 4-Channel PMBus Power System Manager Featuring Accurate Output Current Measurement
Supervisory Circuits & Reset ICs 1
LTC2935
PRODUCTION Ultra-Low Power Supervisor with Power-Fail Output, Selectable Thresholds
Switching Regulators & Controllers 1
LTC3880
RECOMMENDED FOR NEW DESIGNS Dual Output PolyPhase Step-Down DC/DC Controller with Digital Power System Management
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Tools & Simulations

LTspice 1

Models for the following parts are available in LTspice:

  • LTC3564
LTspice

LTspice® is a powerful, fast and free simulation software, schematic capture and waveform viewer with enhancements and models for improving the simulation of analog circuits.

Evaluation Kits

eval board
schematic 1
DC1343A

LTC3564DCB6 Demo Board (DFN) | 2.25MHz, 2.5V ≤ VIN ≤ 5.5V, VOUT = 1.2V/1.5V/1.8V @ 1.25A

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Product Details

Demonstration circuit DC1343A is a high efficiency monolithic synchronous buck regulator using a constant frequency, current mode architecture featuring LTC3564 in the 2×3 DFN-6 package. The demo board features a 2.5V to 5.5V input voltage range and provides a jumper-selectable 1.2V/1.5V/1.8V output at 1.25A. Its high switching frequency of 2.25MHz allows the use of small surface mount inductors and capacitors.


 


eval board
schematic 2
DC1158A

LTC3564ES5 Demo Board (TSOT) | 2.25MHz, 2.5V ≤ VIN ≤ 5.5V, VOUT = 1.2V/1.5V/1.8V @ 1.25A

Buy Now View Details

Product Details

Demonstration circuit DC1158A is a high efficiency monolithic synchronous buck regulator using a constant frequency, current mode architecture featuring LTC3564 in the ThinSOT package. The demo board features a 2.5V to 5.5V input voltage range and provides a jumper-selectable 1.2V/1.5V/1.8V output at 1.25A. Its high switching frequency of 2.25MHz allows the use of small surface mount inductors and capacitors.
DC1343A
LTC3564DCB6 Demo Board (DFN) | 2.25MHz, 2.5V ≤ VIN ≤ 5.5V, VOUT = 1.2V/1.5V/1.8V @ 1.25A
DC1343A - Schematic
DC1158A
LTC3564ES5 Demo Board (TSOT) | 2.25MHz, 2.5V ≤ VIN ≤ 5.5V, VOUT = 1.2V/1.5V/1.8V @ 1.25A
DC1158A - Schematic

Latest Discussions

2 Years Ago
value for in/output capacitor of LTC3564
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