D2575
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DC/DC Series Circuit
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Function Description
General Description
The D2575 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 D2575 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 D2575 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
· 3.3V, 5V, 12V and adjustable output versions
· Guaranteed 2A output current
· Adjustable version output voltage range,1.23V to 37V±4% max over line and load conditions
· 52 kHz fixed frequency internal oscillator
· TTL shutdown capability, low power standby mode
· High efficiency
· Uses readily available standard inductors
· Thermal shutdown and current limit protection
· Wide input voltage range up to 40V
· Requires only 4 external components
Applications
· Simple high-efficiency step-down (buck) regulator
· Efficient pre-regulator for linear regulators
· On-card switching regulators
· Positive to negative converter (Buck-Boost)
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