LTC3624/LTC3624-2 - 17V, 2A Synchronous Step-Down Regulator with 3.5μA Quiescent Current

Features

  • Wide VIN Range: 2.7V to 17V
  • Wide VOUT Range: 0.6V to VIN
  • 95% Max Efficiency
  • Low IQ: 3.5μA, Zero-Current Shutdown
  • Constant Frequency (1MHz/2.25MHz)
  • Fixed VOUT Options Available
  • Low Dropout Operation (100% Duty Cycle) with Ultralow IQ
  • 2A Rated Output Current
  • ±1% Output Voltage Accuracy
  • Current Mode Operation for Excellent Line and Load Transient Response
  • Synchronizable to External Clock
  • Pulse-Skipping, Forced Continuous, Burst Mode® Operation
  • Internal Compensation and Soft-Start
  • Overtemperature Protection
  • Compact 8-Lead DFN (3mm × 3mm) Package

Typical Application

LTC3624 Typical Application
LTC3624 Typical Application

Description

The LTC®3624/LTC3624-2 is a high efficiency 17V, 2A synchronous monolithic step-down regulator. The switching frequency is fixed to 1MHz (LTC3624) or 2.25MHz (LTC3624-2) with a ±40% synchronization range. The regulator features ultralow quiescent current and high efficiency over a wide VOUT range.

The step-down regulator operates from an input voltage range of 2.7V to 17V and provides an adjustable output range from 0.6V to VIN while delivering up to 2A of output current. A user-selectable mode input is provided to allow the user to trade off ripple noise for light load efficiency; Burst Mode operation provides the highest efficiency at light loads, while pulse-skipping mode provides the lowest voltage ripple. The MODE pin can also be used to sync the switching frequency to an external clock.

LTC3624/LTC3624-2 Options

Part Number Frequency Vout
LTC3624 1MHz Adjustable
LTC3624-3.3 1MHz 3.3V
LTC3624-5 1MHz 5V
LTC3624-2 2.25MHz Adjustable
LTC3624-23.3 2.25MHz 3.3
LTC3624-25 2.25MHz 5V

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
LTC3624EDD-2#PBF 3x3 DFN-8 DD E 05-08-1698 Yes
LTC3624EDD-2#TRPBF 3x3 DFN-8 DD E 05-08-1698 Yes
LTC3624EDD-23.3#PBF 3x3 DFN-8 DD E 05-08-1698 Yes
LTC3624EDD-23.3#TRPBF 3x3 DFN-8 DD E 05-08-1698 Yes
LTC3624EDD-25#PBF 3x3 DFN-8 DD E 05-08-1698 Yes
LTC3624EDD-25#TRPBF 3x3 DFN-8 DD E 05-08-1698 Yes
LTC3624EDD-3.3#PBF 3x3 DFN-8 DD E 05-08-1698 Yes
LTC3624EDD-3.3#TRPBF 3x3 DFN-8 DD E 05-08-1698 Yes
LTC3624EDD-5#PBF 3x3 DFN-8 DD E 05-08-1698 Yes
LTC3624EDD-5#TRPBF 3x3 DFN-8 DD E 05-08-1698 Yes
LTC3624EDD#PBF 3x3 DFN-8 DD E 05-08-1698 Yes
LTC3624EDD#TRPBF 3x3 DFN-8 DD E 05-08-1698 Yes
LTC3624EMSE-2#PBF MS-12E MSE E 05-08-1666 Yes
LTC3624EMSE-2#TRPBF MS-12E MSE E 05-08-1666 Yes
LTC3624EMSE-23.3#PBF MS-12E MSE E 05-08-1666 Yes
LTC3624EMSE-23.3#TRPBF MS-12E MSE E 05-08-1666 Yes
LTC3624EMSE-25#PBF MS-12E MSE E 05-08-1666 Yes
LTC3624EMSE-25#TRPBF MS-12E MSE E 05-08-1666 Yes
LTC3624EMSE-3.3#PBF MS-12E MSE E 05-08-1666 Yes
LTC3624EMSE-3.3#TRPBF MS-12E MSE E 05-08-1666 Yes
LTC3624EMSE-5#PBF MS-12E MSE E 05-08-1666 Yes
LTC3624EMSE-5#TRPBF MS-12E MSE E 05-08-1666 Yes
LTC3624EMSE#PBF MS-12E MSE E 05-08-1666 Yes
LTC3624EMSE#TRPBF MS-12E MSE E 05-08-1666 Yes
LTC3624HMSE-2#PBF MS-12E MSE H 05-08-1666 Yes
LTC3624HMSE-2#TRPBF MS-12E MSE H 05-08-1666 Yes
LTC3624HMSE-23.3#PBF MS-12E MSE H 05-08-1666 Yes
LTC3624HMSE-23.3#TRPBF MS-12E MSE H 05-08-1666 Yes
LTC3624HMSE-25#PBF MS-12E MSE H 05-08-1666 Yes
LTC3624HMSE-25#TRPBF MS-12E MSE H 05-08-1666 Yes
LTC3624HMSE-3.3#PBF MS-12E MSE H 05-08-1666 Yes
LTC3624HMSE-3.3#TRPBF MS-12E MSE H 05-08-1666 Yes
LTC3624HMSE-5#PBF MS-12E MSE H 05-08-1666 Yes
LTC3624HMSE-5#TRPBF MS-12E MSE H 05-08-1666 Yes
LTC3624HMSE#PBF MS-12E MSE H 05-08-1666 Yes
LTC3624HMSE#TRPBF MS-12E MSE H 05-08-1666 Yes
LTC3624IDD-2#PBF 3x3 DFN-8 DD I 05-08-1698 Yes
LTC3624IDD-2#TRPBF 3x3 DFN-8 DD I 05-08-1698 Yes
LTC3624IDD-23.3#PBF 3x3 DFN-8 DD I 05-08-1698 Yes
LTC3624IDD-23.3#TRPBF 3x3 DFN-8 DD I 05-08-1698 Yes
LTC3624IDD-25#PBF 3x3 DFN-8 DD I 05-08-1698 Yes
LTC3624IDD-25#TRPBF 3x3 DFN-8 DD I 05-08-1698 Yes
LTC3624IDD-3.3#PBF 3x3 DFN-8 DD I 05-08-1698 Yes
LTC3624IDD-3.3#TRPBF 3x3 DFN-8 DD I 05-08-1698 Yes
LTC3624IDD-5#PBF 3x3 DFN-8 DD I 05-08-1698 Yes
LTC3624IDD-5#TRPBF 3x3 DFN-8 DD I 05-08-1698 Yes
LTC3624IDD#PBF 3x3 DFN-8 DD I 05-08-1698 Yes
LTC3624IDD#TRPBF 3x3 DFN-8 DD I 05-08-1698 Yes
LTC3624IMSE-2#PBF MS-12E MSE I 05-08-1666 Yes
LTC3624IMSE-2#TRPBF MS-12E MSE I 05-08-1666 Yes
LTC3624IMSE-23.3#PBF MS-12E MSE I 05-08-1666 Yes
LTC3624IMSE-23.3#TRPBF MS-12E MSE I 05-08-1666 Yes
LTC3624IMSE-25#PBF MS-12E MSE I 05-08-1666 Yes
LTC3624IMSE-25#TRPBF MS-12E MSE I 05-08-1666 Yes
LTC3624IMSE-3.3#PBF MS-12E MSE I 05-08-1666 Yes
LTC3624IMSE-3.3#TRPBF MS-12E MSE I 05-08-1666 Yes
LTC3624IMSE-5#PBF MS-12E MSE I 05-08-1666 Yes
LTC3624IMSE-5#TRPBF MS-12E MSE I 05-08-1666 Yes
LTC3624IMSE#PBF MS-12E MSE I 05-08-1666 Yes
LTC3624IMSE#TRPBF MS-12E MSE I 05-08-1666 Yes


LTC3624 Package Drawing
LTC3624 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
LTC3624EDD-2#PBF 3x3 DFN-8 E $4.22 $2.95 Yes
LTC3624EDD-2#TRPBF 3x3 DFN-8 E $3.01 Yes
LTC3624EDD-23.3#PBF 3x3 DFN-8 E $4.22 $2.95 Yes
LTC3624EDD-23.3#TRPBF 3x3 DFN-8 E $3.01 Yes
LTC3624EDD-25#PBF 3x3 DFN-8 E $4.22 $2.95 Yes
LTC3624EDD-25#TRPBF 3x3 DFN-8 E $3.01 Yes
LTC3624EDD-3.3#PBF 3x3 DFN-8 E $4.22 $2.95 Yes
LTC3624EDD-3.3#TRPBF 3x3 DFN-8 E $3.01 Yes
LTC3624EDD-5#PBF 3x3 DFN-8 E $4.22 $2.95 Yes
LTC3624EDD-5#TRPBF 3x3 DFN-8 E $3.01 Yes
LTC3624EDD#PBF 3x3 DFN-8 E $4.22 $2.95 Yes
LTC3624EDD#TRPBF 3x3 DFN-8 E $3.01 Yes
LTC3624EMSE-2#PBF MS-12E E $4.22 $2.95 Yes
LTC3624EMSE-2#TRPBF MS-12E E $3.01 Yes
LTC3624EMSE-23.3#PBF MS-12E E $4.22 $2.95 Yes
LTC3624EMSE-23.3#TRPBF MS-12E E $3.01 Yes
LTC3624EMSE-25#PBF MS-12E E $4.22 $2.95 Yes
LTC3624EMSE-25#TRPBF MS-12E E $3.01 Yes
LTC3624EMSE-3.3#PBF MS-12E E $4.22 $2.95 Yes
LTC3624EMSE-3.3#TRPBF MS-12E E $3.01 Yes
LTC3624EMSE-5#PBF MS-12E E $4.22 $2.95 Yes
LTC3624EMSE-5#TRPBF MS-12E E $3.01 Yes
LTC3624EMSE#PBF MS-12E E $4.22 $2.95 Yes
LTC3624EMSE#TRPBF MS-12E E $3.01 Yes
LTC3624HMSE-2#PBF MS-12E H $5.00 $3.50 Yes
LTC3624HMSE-2#TRPBF MS-12E H $3.56 Yes
LTC3624HMSE-23.3#PBF MS-12E H $5.00 $3.50 Yes
LTC3624HMSE-23.3#TRPBF MS-12E H $3.56 Yes
LTC3624HMSE-25#PBF MS-12E H $5.00 $3.50 Yes
LTC3624HMSE-25#TRPBF MS-12E H $3.56 Yes
LTC3624HMSE-3.3#PBF MS-12E H $5.00 $3.50 Yes
LTC3624HMSE-3.3#TRPBF MS-12E H $3.56 Yes
LTC3624HMSE-5#PBF MS-12E H $5.00 $3.50 Yes
LTC3624HMSE-5#TRPBF MS-12E H $3.56 Yes
LTC3624HMSE#PBF MS-12E H $5.00 $3.50 Yes
LTC3624HMSE#TRPBF MS-12E H $3.56 Yes
LTC3624IDD-2#PBF 3x3 DFN-8 I $4.64 $3.25 Yes
LTC3624IDD-2#TRPBF 3x3 DFN-8 I $3.31 Yes
LTC3624IDD-23.3#PBF 3x3 DFN-8 I $4.64 $3.25 Yes
LTC3624IDD-23.3#TRPBF 3x3 DFN-8 I $3.31 Yes
LTC3624IDD-25#PBF 3x3 DFN-8 I $4.64 $3.25 Yes
LTC3624IDD-25#TRPBF 3x3 DFN-8 I $3.31 Yes
LTC3624IDD-3.3#PBF 3x3 DFN-8 I $4.64 $3.25 Yes
LTC3624IDD-3.3#TRPBF 3x3 DFN-8 I $3.31 Yes
LTC3624IDD-5#PBF 3x3 DFN-8 I $4.64 $3.25 Yes
LTC3624IDD-5#TRPBF 3x3 DFN-8 I $3.31 Yes
LTC3624IDD#PBF 3x3 DFN-8 I $4.64 $3.25 Yes
LTC3624IDD#TRPBF 3x3 DFN-8 I $3.31 Yes
LTC3624IMSE-2#PBF MS-12E I $4.64 $3.25 Yes
LTC3624IMSE-2#TRPBF MS-12E I $3.31 Yes
LTC3624IMSE-23.3#PBF MS-12E I $4.64 $3.25 Yes
LTC3624IMSE-23.3#TRPBF MS-12E I $3.31 Yes
LTC3624IMSE-25#PBF MS-12E I $4.64 $3.25 Yes
LTC3624IMSE-25#TRPBF MS-12E I $3.31 Yes
LTC3624IMSE-3.3#PBF MS-12E I $4.64 $3.25 Yes
LTC3624IMSE-3.3#TRPBF MS-12E I $3.31 Yes
LTC3624IMSE-5#PBF MS-12E I $4.64 $3.25 Yes
LTC3624IMSE-5#TRPBF MS-12E I $3.31 Yes
LTC3624IMSE#PBF MS-12E I $4.64 $3.25 Yes
LTC3624IMSE#TRPBF MS-12E I $3.31 Yes
Buy NowRequest Samples
* 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
DC2005A LTC3624 Demo Board (DFN) | Micropower Sync Buck, 2.7V ≤ VIN ≤ 17V, Vout = 1.2V/1.8V/2.5V/3.3V/5V/Adj @ 2A $150.00
DC2359A LTC3624 Demo Board (MSOP) | Micropower Sync Buck, 2.7V ≤ VIN ≤ 17V, Vout = 1.2V/1.8V/2.5V/3.3V/5V @ 2A Contact Factory
Buy Now
Click here to view our complete list of demo boards

Applications

  • Battery Powered Equipment
  • Portable Instrumentation
  • Emergency Radios
  • General Purpose Step-Down Supplies

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Design Tools

LTspiceIV

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Models for the following parts are available in LTspice IV:
LTC3624
LTC3624-2

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Design tools for the following parts are available in LTpowerCAD:
LTC3624
LTC3624-2

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