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CS51411/CS51412/CS51413/CS5141
李鸿洋
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CS51411, CS51412,
CS51413, CS51414
1.5 A, 260 kHz and 520 kHz,
Low Voltage Buck
Regulators with External
Bias or Synchronization
Capability
The CS5141X products are 1.5 A buck regulator ICs. These devices
are fixed-frequency operating at 260 kHz and 520 kHz. The regulators
use the V2™ control architecture to provide unmatched transient
response, the best overall regulation and the simplest loop
compensation for today's high-speed logic. These products
accommodate input voltages from 4.5 V to 40 V.
The CS51411 and CS51413 contain synchronization circuitry. The
CS51412 and CS51414 have the option of powering the controller
from an external 3.3 V to 6.0 V supply in order to improve efficiency,
especially in high input voltage, light load conditions.
The on-chip NPN transistor is capable of providing a minimum of
1.5 A of output current, and is biased by an external “boost” capacitor
to ensure saturation, thus minimizing on-chip power dissipation.
Protection circuitry includes thermal shutdown, cycle-by-cycle
current limiting and frequency foldback. The CS51411 and CS51413
are functionally pin-compatible with the LT1375. The CS51412 and
CS51414 are functionally pin-compatible with the LT1376.
Features
•V2 Architecture Provides Ultrafast Transient Response, Improved
Regulation and Simplified Design
•2.0% Error Amp Reference Voltage Tolerance
•Switch Frequency Decrease of 4:1 in Short Circuit Conditions
Reduces Short Circuit Power Dissipation
•BOOST Lead Allows “Bootstrapped” Operation to Maximize
Efficiency
•Sync Function for Parallel Supply Operation or Noise Minimization
•Shutdown Lead Provides Power-Down Option
•85 A Quiescent Current During Power-Down
•Thermal Shutdown
•Soft-Start
•Pin-Compatible with LT1375 and LT1376
•Pb-Free Packages are Available
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