LT3430 - High Voltage, 3A, 200kHz Step-Down Switching Regulator

The LT3430/LT3430-1 are monolithic buck switching regulators that accept input voltages up to 60V. A high efficiency 3A, 0.1Ω switch is included on the die along with all the necessary oscillator, control and logic circuitry. A current mode architecture provides fast transient response and excellent loop stability.

Special design techniques and a new high voltage process achieve high efficiency over a wide input range. Efficiency is maintained over a wide output current range by using the output to bias the circuitry and by utilizing a supply boost capacitor to saturate the power switch. Patented circuitry* maintains peak switch current over the full duty cycle range. A shutdown pin reduces supply current to 30µA and a SYNC pin can be externally synchronized with a logic level input from 228kHz to 700kHz for the LT3430 or from 125kHz to 250kHz for the LT3430-1.

The LT3430/LT3430-1 are available in a thermally enhanced 16-pin TSSOP package.

Features
  • Wide Input Range: 5.5V to 60V
  • 3A Peak Switch Current over All Duty Cycles
  • Constant Switching Frequency: 200kHz (LT3430) 100kHz (LT3430-1)
  • 0.1Ω Switch Resistance
  • Current Mode
  • Effective Supply Current: 2.5mA
  • Shutdown Current: 30µA
  • 1.2V Feedback Reference Voltage
  • Easily Synchronizable
  • Cycle-by-Cycle Current Limiting
  • Small, 16-Pin Thermally Enhanced TSSOP Package
Typical Application

Applications
  • Industrial and Automotive Power Supplies
  • Portable Computers
  • Battery Chargers
  • Distributed Power Systems
Packaging
Order Information
Part NumberPackageTempPrice(1-99)Price (1k)*
LT3430EFE-1#PBFTSSOP-16E$7.07$4.95
LT3430EFE-1#TRPBFTSSOP-16E$5.07
LT3430EFE#PBFTSSOP-16E$7.07$4.95
LT3430EFE#TRPBFTSSOP-16E$5.07
LT3430IFE-1#PBFTSSOP-16I$8.13$5.69
LT3430IFE-1#TRPBFTSSOP-16I$5.81
LT3430IFE#PBFTSSOP-16I$8.13$5.69
LT3430IFE#TRPBFTSSOP-16I$5.81
Demo Boards
Part NumberDescriptionPrice
DC1200ALT3430EFE-1 Demo Board | 5.5V ≤ VIN ≤ 60V, VOUT = 3.3V @ 2AContact Factory
DC471ALT3430EFE | High Voltage Buck Converter, Vin = 7.5V to 60V, Vout = 5V @ 2A$100.00
Datasheet
Design Note
Reliability Data
LT Journal
LTspice
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