LTC3419 - Dual Monolithic 600mA Synchronous Step-Down Regulator


  • High Efficiency Dual Step-Down Outputs: Up to 96%
  • 600mA Current per Channel at VIN = 3V
  • Only 35µA Quiescent Current During Operation (Both Channels)
  • 2.25MHz Constant-Frequency Operation
  • 2.5V to 5.5V Input Voltage Range
  • Low Dropout Operation: 100% Duty Cycle
  • No Schottky Diodes Required
  • Internally Compensated for All Ceramic Capacitors
  • Independent Internal Soft-Start for Each Channel
  • Available in Fixed Output Versions
  • Current Mode Operation for Excellent Line and Load Transient Response
  • 0.6V Reference Allows Low Output Voltages
  • User-Selectable Burst Mode® Operation
  • Short-Circuit Protected
  • Ultralow Shutdown Current: IQ < 1µA
  • Available in Small MSOP or 3mm × 3mm DFN-8 Packages

Typical Application

LTC3419 Typical Application
LTC3419 Typical Application


The LTC3419 is a dual, 2.25MHz, constant-frequency, synchronous step-down DC/DC converter in a tiny 3mm × 3mm DFN package. 100% duty cycle provides low dropout operation, extending battery life in portable systems. Low output voltages are supported with the 0.6V feedback reference voltage. Each regulator can supply 600mA output current.

The input voltage range is 2.5V to 5.5V, making it ideal for Li-Ion and USB powered applications. Supply current during operation is only 35µA and drops to <1µA in shutdown. A user-selectable mode input allows the user to trade off between high efficiency Burst Mode operation and pulse-skipping mode.

An internally set 2.25MHz switching frequency allows the use of tiny surface mount inductors and capacitors. Internal soft-start reduces inrush current during start-up. Both outputs are internally compensated to work with ceramic output capacitors. The LTC3419 is available in a low profile (0.75mm) 3mm × 3mm DFN package. The LTC3419 is also available in a fixed output voltage configuration selected via internal resistor dividers (see Table 2).


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
LTC3419EDD-1#PBF 3x3 DFN-8 DD E 05-08-1698 Yes
LTC3419EDD-1#TRPBF 3x3 DFN-8 DD E 05-08-1698 Yes
LTC3419EDD#PBF 3x3 DFN-8 DD E 05-08-1698 Yes
LTC3419EDD#TRPBF 3x3 DFN-8 DD E 05-08-1698 Yes
LTC3419EMS-1#PBF MS-10 MS E 05-08-1661 Yes
LTC3419EMS-1#TRPBF MS-10 MS E 05-08-1661 Yes
LTC3419EMS#PBF MS-10 MS E 05-08-1661 Yes
LTC3419EMS#TRPBF MS-10 MS E 05-08-1661 Yes
LTC3419IDD-1#PBF 3x3 DFN-8 DD I 05-08-1698 Yes
LTC3419IDD-1#TRPBF 3x3 DFN-8 DD I 05-08-1698 Yes
LTC3419IDD#PBF 3x3 DFN-8 DD I 05-08-1698 Yes
LTC3419IDD#TRPBF 3x3 DFN-8 DD I 05-08-1698 Yes
LTC3419IMS-1#PBF MS-10 MS I 05-08-1661 Yes
LTC3419IMS-1#TRPBF MS-10 MS I 05-08-1661 Yes
LTC3419IMS#PBF MS-10 MS I 05-08-1661 Yes
LTC3419IMS#TRPBF MS-10 MS I 05-08-1661 Yes

LTC3419 Package Drawing
LTC3419 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
LTC3419EDD-1#PBF 3x3 DFN-8 E $2.79 $1.95 Yes
LTC3419EDD-1#TRPBF 3x3 DFN-8 E $2.01 Yes
LTC3419EDD#PBF 3x3 DFN-8 E $2.79 $1.95 Yes
LTC3419EDD#TRPBF 3x3 DFN-8 E $2.01 Yes
LTC3419EMS-1#PBF MS-10 E $2.79 $1.95 Yes
LTC3419EMS-1#TRPBF MS-10 E $2.01 Yes
LTC3419EMS#PBF MS-10 E $2.79 $1.95 Yes
LTC3419EMS#TRPBF MS-10 E $2.01 Yes
LTC3419IDD-1#PBF 3x3 DFN-8 I $3.07 $2.15 Yes
LTC3419IDD-1#TRPBF 3x3 DFN-8 I $2.21 Yes
LTC3419IDD#PBF 3x3 DFN-8 I $3.07 $2.15 Yes
LTC3419IDD#TRPBF 3x3 DFN-8 I $2.21 Yes
LTC3419IMS-1#PBF MS-10 I $3.07 $2.15 Yes
LTC3419IMS-1#TRPBF MS-10 I $2.21 Yes
LTC3419IMS#PBF MS-10 I $3.07 $2.15 Yes
LTC3419IMS#TRPBF MS-10 I $2.21 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.

Part Number Description Price Documentation
DC1128A LTC3419EDD Demo Board | 2.25MHz, 2.5V ≤ VIN ≤ 5.5V, Vout1 = 1.2V/1.5V/1.8V @ 600mA, Vout2 = 2.5V/3.3V @ 600mA $100.00
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  • Cellular Telephones
  • Digital Still Cameras
  • Wireless and DSL Modems
  • Portable Media Players
  • PDAs/Palmtop PCs

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