TIGER ELECTRONIC CO.,LTD
3A Step-Down Voltage Regulator
LM2576BM
DESCRIPITION
The
LM2576BM
series of regulators are monolithic in tegrated circuits that provide all th e
active functions for a step-down (buck) switching regulator, capable of driving 3A 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 minimu m number of external components, these regulators are simple to use
and include internal frequency compensation and a fixed-frequency oscillator.
The
LM2576BM
series offers a high-efficiency replacement for popular three-terminal linear
regulators. It substantially reduces the size of the heat sink, and in so me cases no heat sink
is required. A standard series of inducto rs optimized for use with the
LM2576BM
are
available fro m several different manufacturers. This feature greatly si mplifies 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 ther mal shutdown for full protection under fault
conditions.
FEATURES
3.3V, 5V, 12V and adjustable output versions
Guaranteed 3A output current
Adjustable version output voltage range,1.23V to
37V±4% max over line and lo ad cond itions
52 kHz fixed frequency internal oscillator
TTL shutdown capability, low power standby mode
High efficiency
Uses readily available standard inducto rs
Thermal shutdown and current limit protection
Wide input voltage range up to 40V
Requires on ly 4 ex tern al co mponents
APPLICATIONS
Si mple high-efficiency
step-down (buck) regulator
Efficient
pre-regulator
for
linear regulators
On-card switching regu lato rs
Positive to negative
conv erter (Buck-Boost)
1/9
TGS [ Tiger Electronic Co.,Ltd ]
