LTC3606B - 800mA Synchronous Step-Down DC/DC with Average Input Current Limit

Features

  • Programmable Average Input Current Limit: ±5% Accuracy
  • Step-Down Output: Up to 96% Efficiency
  • Low Noise Pulse-Skipping Operation at Light Loads
  • Input Voltage Range: 2.5V to 5.5V
  • Output Voltage Range: 0.6V to 5V
  • 2.25MHz Constant-Frequency Operation
  • Power Good Output Voltage Monitor
  • Low Dropout Operation: 100% Duty Cycle
  • Internal Soft-Start
  • Current Mode Operation for Excellent Line and Load Transient Response
  • ±2% Output Voltage Accuracy
  • Short-Circuit Protected
  • Shutdown Current ≤ 1μA
  • Available in Small Thermally Enhanced 8-Lead 3mm 3mm DFN Package

Typical Application

LTC3606B Typical Application
LTC3606B Typical Application

Description

The LTC3606B is an 800mA monolithic synchronous buck regulator using a constant frequency current mode architecture.

The input supply voltage range is 2.5V to 5.5V, making it ideal for Li-Ion and USB powered applications. 100% duty cycle capability provides low dropout operation, extending the run time in battery-operated systems. Low output voltages are supported with the 0.6V feedback reference voltage. The LTC3606B can supply 800mA output current.

The LTC3606B’s programmable average input current limit is ideal for USB applications and for point-of-load power supplies because the LTC3606B’s limited input current will still allow its output to deliver high peak load currents without collapsing the input supply. The operating frequency is internally set at 2.25MHz allowing the use of small surface mount inductors. Internal soft-start reduces in-rush current during start-up. The LTC3606B is available in an 8-Lead 3mm × 3mm DFN package.

Packaging

CAD Symbols and Footprints: The downloadable Zip file below contains the schematic symbol and PCB footprints.

For complete and up to date package information and drawings, please refer to our packaging page

Part Number Package Code Temp Package
Drawing
RoHS
LTC3606BEDD#PBF 3x3 DFN-8 DD E 05-08-1698 Yes
LTC3606BEDD#TRPBF 3x3 DFN-8 DD E 05-08-1698 Yes
LTC3606BIDD#PBF 3x3 DFN-8 DD I 05-08-1698 Yes
LTC3606BIDD#TRPBF 3x3 DFN-8 DD I 05-08-1698 Yes


LTC3606B Package Drawing

Order Info

  • Part numbers ending in PBF are lead free. Solder plated terminal finish (SnPb) versions are non-standard and special terms and conditions and pricing applies if available. Please contact LTC marketing for information.
  • Part numbers containing TR or TRM are shipped in tape and reel or 500 unit mini tape and reel, respectively
  • Please refer to our general ordering information or the product datasheet for more details

Package Variations and Pricing

Part Number Package Temp Price
(1-99)
Price
(1k)*
RoHS
LTC3606BEDD#PBF 3x3 DFN-8 E $3.00 $2.10 Yes
LTC3606BEDD#TRPBF 3x3 DFN-8 E $2.16 Yes
LTC3606BIDD#PBF 3x3 DFN-8 I $3.53 $2.47 Yes
LTC3606BIDD#TRPBF 3x3 DFN-8 I $2.53 Yes
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* The USA list pricing shown is for BUDGETARY USE ONLY, shown in United States dollars (FOB USA per unit for the stated volume), and is subject to change. International prices may differ due to local duties, taxes, fees and exchange rates. For volume-specific price or delivery quotes, please contact your local Linear Technology sales office or authorized distributor.

Demo Boards

Linear Technology offers many demo boards free of charge to qualified customers. Contact your local sales office or distributor to inquire about a demo board. Certain demo boards are also available for sale via credit card on this website. Demo boards are for evaluation purposes only. It remains the customer’s responsibility to verify proper and reliable operation in the actual end application.

Click here to view our complete list of demo boards

Applications

  • High Peak Load Current Applications
  • USB Powered Devices
  • Supercapacitor Charging
  • Radio Transmitters and Other Handheld Devices

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Design Tools

LTspice

LTspice® software is a powerful, fast and free simulation tool, schematic capture and waveform viewer with enhancements and models for improving the simulation of switching regulators. Click here to download LTspice

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Models for the following parts are available in LTspice:
LTC3606B

Technical Support