LTC3646/LTC3646-1 - 40V, 1A Synchronous Step-Down Converter
Datasheet Documentation
Datasheet
Reliability Data
Press Release
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Overview

Features

Typical Application

LTC3646 Typical Application
LTC3646 Typical Application

Description

The LTC®3646 is a high efficiency, step-down DC/DC converter with internal high side and synchronous power FETs. It draws only 140μA typical DC supply current in Burst Mode operation at no load while maintaining output voltage regulation.

The LTC3646 can supply up to a 1A load, and its combination of Burst Mode operation, integrated power switches and low quiescent current provides high efficiency over a broad range of load currents. Alternatively, it can be used in forced continuous mode for ripple sensitive applications.

The LTC3646 has a wide 4.0V to 40V input range and its patented controlled on-time architecture and 0.6V reference voltage allow for large step-down ratios without the risk of output overvoltage. The frequency may be set between 200kHz and 3.0MHz with a program resistor or synchronized to an external clock.

The internal soft-start, short-circuit protection and voltage rating make the LTC3646 a robust part ideal for high voltage applications.

Packaging

4x3 DFN-14,MS-16E

LTC3646 Package Drawing
LTC3646 Package Drawing
Order Info

Package Variations and Pricing

Part Number Package Pins Temp Price
(1-99)		 Price
(1k)*
LTC3646EDE#PBF DFN 14 E $4.07 $2.85
LTC3646EDE#TRPBF DFN 14 E $2.91
LTC3646EDE-1#PBF DFN 14 E $4.07 $2.85
LTC3646EDE-1#TRPBF DFN 14 E $2.91
LTC3646EMSE#PBF MSOP 16 E $4.07 $2.85
LTC3646EMSE#TRPBF MSOP 16 E $2.91
LTC3646EMSE-1#PBF MSOP 16 E $4.07 $2.85
LTC3646EMSE-1#TRPBF MSOP 16 E $2.91
LTC3646HDE#PBF DFN 14 H $4.84 $3.39
LTC3646HDE#TRPBF DFN 14 H $3.45
LTC3646HDE-1#PBF DFN 14 H $4.84 $3.39
LTC3646HDE-1#TRPBF DFN 14 H $3.45
LTC3646HMSE#PBF MSOP 16 H $4.84 $3.39
LTC3646HMSE#TRPBF MSOP 16 H $3.45
LTC3646HMSE-1#PBF MSOP 16 H $4.84 $3.39
LTC3646HMSE-1#TRPBF MSOP 16 H $3.45
LTC3646IDE#PBF DFN 14 I $4.49 $3.14
LTC3646IDE#TRPBF DFN 14 I $3.20
LTC3646IDE-1#PBF DFN 14 I $4.49 $3.14
LTC3646IDE-1#TRPBF DFN 14 I $3.20
LTC3646IMSE#PBF MSOP 16 I $4.49 $3.14
LTC3646IMSE#TRPBF MSOP 16 I $3.20
LTC3646IMSE-1#PBF MSOP 16 I $4.49 $3.14
LTC3646IMSE-1#TRPBF MSOP 16 I $3.20
LTC3646EDE DFN 14 E $8.14 $5.70
* 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.


Part Number Description Price Documentation
DC1731A-A LTC3646 Demo Board (DFN) I 4V ≤ VIN ≤ 40V, Vout = 3.3V or 5V @ 1A $150.00
DC1731A-B LTC3646-1 Demo Board (DFN) | 4V ≤ VIN ≤ 40V, Vout = 3.3V or 5V @ 1A $150.00
DC1820A-A LTC3646 Demo Board (MSOP) | 4V ≤ VIN ≤ 40V, Vout = 3.3V or 5V @ 1A $150.00
DC1820A-B LTC3646-1 Demo Board (MSOP) | 4V ≤ VIN ≤ 40V, Vout = 3.3V or 5V @ 1A Contact Factory