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TD1558B 58V, 0.3A, Step Down COT Switching Regulator

The TD1558B Step Down Switching Regulator features all of
the functions needed to implement a low cost, efficient, buck
bias regulator capable of supplying 0.3A to the load. This
buck regulator contains an N-Channel Buck Switch. The
constant on-time feedback regulation scheme requires no
loop compensation, results in fast load transient response,
and simplifies circuit implementation. The operating
frequency remains constant with line and load variations due
to the inverse relationship between the input voltage and the
on-time. The valley current limit results in a smooth
transition from constant voltage to constant current mode
when current limit is detected, reducing the frequency and
output voltage, without the use of foldback. Additional
features include: thermal shutdown, gate drive under-voltage
lockout, and maximum duty cycle limiter, etc.
The TD1558B requires a minimal number of readily-available
external components. The TD1558B is available in a SOT23-6
packag

⚫ 0.3A Peak Output Current
⚫ 1.3Ω Internal Power MOSFET
⚫ Up to 91% Efficiency
⚫ 0.1μA Shutdown Mode
⚫ Fixed 600kHz Frequency
⚫ Thermal Shutdown
⚫ Cycle-by-Cycle Over-Current Protection
⚫ 11V to 58V Operating Input Range
⚫ Max duty 80%
⚫ Input current<2ma in case of shorted or over
current
⚫ Available in a SOT23-6 Package
Applications
⚫ Power Meters
⚫ Distributed Power Systems
⚫ Battery Chargers
⚫ Pre-Regulator for Linear Regulators
⚫ WLED Drivers