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PDF D2576 Data sheet ( Hoja de datos )

Número de pieza D2576
Descripción 3A Step-Down Voltage Regulator
Fabricantes Power Mos Microelectronic 
Logotipo Power Mos Microelectronic Logotipo



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D2576
DMS2576 Series 3A Step-Down Voltage Regulator
Description
The DMS2576 series of regulators are
mono-lithic integrated circuits that provide all the
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, 15V, and an adjustable 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 DMS2576 series offers a high-efficiency
re-placement 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 DMS2576 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 80 µA
(typical) standby current. The output switch
includes cycle-by-cycle current limiting.
full protection under fault conditions.
Features
3.3V, 5V, 12V, 15V, and adjustable output
versions
Adjustable version output voltage range, 1.23V
to 37V ±4% max over line and load
conditions
Guaranteed 3A output current
Wide input voltage range, 40V
Requires only 4 external components
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
P+ Product Enhancement tested
Applications
– Simple high-efficiency step-down (buck)
regulator
– Efficient pre-r egul ator for linear regulators
– On-card switching regulators
– Positive to negative converter (Buck-Boost)
REVA3_W
2012-1-1
1 Power Mos Microelectronic Limited
www.dms-mic.com

1 page




D2576 pdf
D2576
SYSTEM PARAMETERS(Note 3)
VOUT
Output Voltage VIN =25V, ILOAD =0.5A
VOUT
η
Output Voltage
Efficiency
18VVIN40V
0.5AILOAD3A
VIN =18V, ILOAD =3A
Typ Limit(Note 2)
15 14.70
15.30
15 11.40/14.25
15.60/15.75
88
V
V(Min)
V(Max)
V
V(Min)
V(Max)
%
DMS2576-ADJ
Electrical
Characteristics
Specifications with standard type face are for T
0
= 25 C, and
J
those with boldface type apply over full Operating Temperature Range.
Symbol
Parameter
Conditions
SYSTEM PARAMETERS(Note 3)
VOUT
Output Voltage VIN =12V, ILOAD =0.5A
VOUT
η
Output Voltage
Efficiency
8VVIN40V
0.5AILOAD3A
VIN =12V, ILOAD =3A
DMS2576-ADJ
Units(Limits)
Typ Limit(Note 2)
1.230
1.230
77
1.217
1.230
1.193/1.18
1.267/1.28
V
V(Min)
V(Max)
V
V(Min)
V(Max)
%
All Output Voltage Versions
Electrical Characteristics Specifications with standard type face are for TJ=25°C, and
those with boldface type apply over full Operating Temperature Range. Unless otherwise specified,
VIN= 12V for the 3.3V, 5V, and Adjustable version, VIN = 25V for the 12V version, and VIN = 30V for the
15V version. I =500 mA.
LOAD
Symbol
Parameter
DEVICE PARAMETERS
Ib Feedback Bias Current
fO Oscillator Frequency
Conditions
VOUT = 5V (Adjustable
Version Only)
(Note 11)
DMS2576-XX
Тур
Limit
(Note 2)
Units (Limits)
50 100/500
52
nA
kHz
REVA3_W
2012-1-1
5 Power Mos Microelectronic Limited
www.dms-mic.com

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