LM2576BM TGS [Tiger Electronic Co.,Ltd], LM2576BM Datasheet

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LM2576BM

Manufacturer Part Number
LM2576BM
Description
3A Step-Down Voltage Regulator
Manufacturer
TGS [Tiger Electronic Co.,Ltd]
Datasheet
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
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
37V±4% max over line and lo ad cond itions
3A Step-Down Voltage Regulator
TIGER ELECTRONIC CO.,LTD
APPLICATIONS
step-down (buck) regulator
conv erter (Buck-Boost)
Si mple high-efficiency
Efficient
linear regulators
On-card switching regu lato rs
Positive to negative
LM2576BM
pre-regulator
for
1/9

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LM2576BM Summary of contents

Page 1

... TIGER ELECTRONIC CO.,LTD 3A Step-Down Voltage Regulator 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 ...

Page 2

... CONNECTION DIAGRAMS ESOP-8L LM2576BM ORDERING INFORMATION Ordering LM2576BM-ADJ LM2576BM-3.3 LM2576BM-5.0 LM2576BM-12 BLOCK DIAGRAM 3. =3.1 K For ADJ Version R1=open, R2=0Ω XX: Weekly YY: Output Voltage Output Voltage Adj. 3.3V 5.0V 12V LM2576BM Package ESOP-8L ESOP-8L ESOP-8L ESOP-8L ESOP -8L 2/9 ...

Page 3

... Maximu m junction temp erature ESD susceptibility (Human Body Model) RECOMMENDED OPERATING CONDITIONS Characteristic Supply Vo ltage Operating te mp erature range (Ta=25°C) * Value 45 -0.3V≤V≤+ Internally li mited -65~+150 2 150 Symbol Value V 6~ -40 ~ LM2576BM Unit °C kV °C Unit V °C 3/9 ...

Page 4

... LM2576BM 12V System Pa ra mete η LM2576BM ADJ Syste mete η Absolute Maxi mu m Ratings indicates limits beyond which dama ge to the device may occur ...

Page 5

... Th e oscillato r frequency reduces to approximately 11 KHz in the even output short or an overload wh ich causes the regulated output voltage to drop approximately 40% fro m the nominal output voltage. The self-pro tection feature lo wers the av erag e power dissipation of the minimu m duty cycle fro down to approximately 2%. TEST CIRCUIT LM2576BM LM2576BM-ADJ LM2576BM 5/9 ...

Page 6

... Figure 1 below should be kept as short as possible. Single point grounding or ground plan e construction should be used for best results. When using the Adjustable version, place the programmi ng resistors as close as possible to LM2576BM, to keep the sensitive feedback wiring short. INPUT CA PACITOR C ...

Page 7

... Most switcher designs will operate in the discontinuous mode when the load current is low. The LM2576BM (or any of the Si mple Switcher family) can be used for both continuous and discontinuous modes of operation. There is a formula for general applications ...

Page 8

... CHARACTERISTICS CURVE LM2576BM 8/9 ...

Page 9

... OUTLINE DRAWING ESOP-8L LM2576BM LM2576BM Unit:mm 9/9 ...

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