WT2575M

2A Step-down Voltage Regulator

General Description:

Applications:

* Simple high-efficiency step-down (buck) regulator

* Efficient pre-regulator for linear regulators

* On-card switching regulators

* Positive to negative converter (Buck-Boost)

WEITRON

hpp://www.weitron.com.tw

WEITRON

1/11

The WT2575 series of regulators are monolithic integrated circuits that provide all the active functions

for a step-down (buck) switching regulator, capable of driving 2A load with excellent line and load

regulation. These devices are available in fixed output voltages of 3.3V, 5V, 12V and an ADJ output version.

Requiring a minimum number of external components, these regulators are simple to use and include

internal frequency compensation and a fixed-frequency oscillator.

The WT2575 series offers a high-efficiency replacement for popular three-terminal linear regulators. It

substantially reduces the size of the heat sink, and in some cases no heat sink is required. A standard

series of inductors optimized for use with the WT2575 are available from several different

manufacturers. This feature greatly simplifies the design of switch-mode power supplies.

Other features include a guaranteed ±4% tolerance on output voltage within specified input voltages and

output load conditions, and ±10% on the oscillator frequency. External shutdown is included, featuring

50 μA (typical) standby current. The output switch includes cycle-by-cycle current limiting, as well as

thermal shutdown for full protection under fault conditions.

Features:

Power Converter 52kHz

Lead(Pb)-Free

P b

* 3.3V, 5V, 12V and adjustable output versions

* Adjustable version output voltage range, 1.23V to 37V ±4% max over line and load conditions

* Guaranteed 2A output current

* Wide input voltage range up to 40V

* Requires only 4 external components

* 52kHz fixed frequency internal oscillator

* TTLshutdown capability, low powerstandby mode

* High efficiency

* Uses readily available standard inductors

* Thermal shutdownand current limit protection

28-Aug-06