LTC1624 - High Efficiency SO-8 N-Channel Switching Regulator Controller


  • N-Channel MOSFET Drive
  • Implements Boost, Step-Down, SEPIC and Inverting Regulators
  • Wide VIN Range: 3.5V to 36V Operation
  • Wide VOUT Range: 1.19V to 30V in Step-Down Configuration
  • ±1% 1.19V Reference
  • Low Dropout Operation: 95% Duty Cycle
  • 200kHz Fixed Frequency
  • Low Standby Current
  • Very High Efficiency
  • Remote Output Voltage Sense
  • Logic-Controlled Micropower Shutdown
  • Internal Diode for Bootstrapped Gate Drive
  • Current Mode Operation for Excellent Line and Load Transient Response
  • Available in an 8-Lead SO Package

Typical Application

LTC1624 Typical Application


The LTC1624 is a current mode switching regulator controller that drives an external N-channel power MOSFET using a fixed frequency architecture. It can be operated in all standard switching configurations including boost, step-down, inverting and SEPIC. Burst Mode operation provides high efficiency at low load currents. A maximum high duty cycle limit of 95% provides low dropout operation which extends operating time in battery-operated systems.

The operating frequency is internally set to 200kHz, allowing small inductor values and minimizing PC board space. The operating current level is user-programmable via an external current sense resistor. Wide input supply range allows operation from 3.5V to 36V (absolute maximum).

A multifunction pin (ITH/RUN) allows external compensation for optimum load step response plus shutdown. Soft start can also be implemented with the ITH/RUN pin to properly sequence supplies.


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

Part Number Package Code Temp Package
LTC1624CS8 SO-8 S8 C 05-08-1610 (S8) RoHS
LTC1624CS8#PBF SO-8 S8 C 05-08-1610 (S8) RoHS
LTC1624CS8#TR SO-8 S8 C 05-08-1610 (S8) RoHS
LTC1624CS8#TRPBF SO-8 S8 C 05-08-1610 (S8) RoHS
LTC1624IS8 SO-8 S8 I 05-08-1610 (S8) RoHS
LTC1624IS8#PBF SO-8 S8 I 05-08-1610 (S8) RoHS
LTC1624IS8#TR SO-8 S8 I 05-08-1610 (S8) RoHS
LTC1624IS8#TRPBF SO-8 S8 I 05-08-1610 (S8) RoHS

LTC1624 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
LTC1624CS8 SO-8 C $8.60 $7.00 No
LTC1624CS8#PBF SO-8 C $4.30 $3.50 Yes
LTC1624CS8#TR SO-8 C $7.12 No
LTC1624CS8#TRPBF SO-8 C $3.56 Yes
LTC1624IS8 SO-8 I $11.00 $8.90 No
LTC1624IS8#PBF SO-8 I $5.50 $4.45 Yes
LTC1624IS8#TR SO-8 I $9.02 No
LTC1624IS8#TRPBF SO-8 I $4.51 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
DC164A LTC1624CS8 Demo Board | Buck Controller, 4.5V ≤ VIN ≤ 28V, Vout = 2.5V/ 3.3V/5.0V @ 3A $100.00
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  • Notebook and Palmtop Computers, PDAs
  • Cellular Telephones and Wireless Modems
  • Battery-Operated Digital Devices
  • DC Power Distribution Systems
  • Battery Chargers

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