ADP3050 データシートの表示（PDF） - Analog Devices
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ADP3050 Datasheet PDF : 20 Pages
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Data Sheet
FEATURES
Wide input voltage range: 3.6 V to 30 V
Adjustable and fixed (3.3 V, 5 V) output options
Integrated 1 A power switch
Uses small surface-mount components
Cycle-by-cycle current limiting
Peak input voltage (100 ms): 60 V
Configurable as a buck, buck-boost, and SEPIC
regulator
Available in 8-lead SOIC package
Supported by ADIsimPower™ design tool
APPLICATIONS
Industrial power systems
PC peripheral power systems
Preregulator for linear regulators
Distributed power systems
Automotive systems
Battery chargers
200 kHz, 1 A High Voltage
Step-Down Switching Regulator
ADP3050
SD 6
GND 7
FUNCTIONAL BLOCK DIAGRAM
BIAS
IN
3
8
2.50V
REGULATOR
CURRENT SENSE
AMPLIFIER
FREQUENCY
AND CURRENT LIMIT
FOLDBACK
CURRENT
LIMIT
FB 4
+
200kHz
OSCILLATOR
CMP
S Q DRIVER
R
gm
1.2V
ADP3050
5
COMP
Figure 1.
2 BOOST
1 SWITCH
GENERAL DESCRIPTION
The ADP3050 is a current mode monolithic buck (step down)
PWM switching regulator that contains a high current 1 A power
switch and all control, logic, and protection functions. It uses a
unique compensation scheme allowing the use of any type of
output capacitor (tantalum, ceramic, electrolytic, OS-CON).
Unlike some buck regulators, the design is not restricted to using
a specific type of output capacitor or ESR value.
A special boosted drive stage is used to saturate the NPN power
switch, providing a system efficiency higher than conventional
bipolar buck switchers. Further efficiency improvements are
obtained by using the low voltage regulated output to provide
the internal operating current of the device. A high switching
frequency allows the use of small external surface-mount compo-
nents. A wide variety of standard off-the-shelf devices can be
used, providing a great deal of design flexibility. A complete
regulator design requires only a few external components.
The ADP3050 includes a shutdown input that places the device
in a low power mode, reducing the total supply current to under
20 µA. Internal protection features include thermal shutdown
circuitry and a cycle-by-cycle current limit for the power switch
to provide complete device protection under fault conditions.
The ADP3050 provides excellent line and load regulation,
maintaining typically less than ±3% output voltage accuracy
over temperature and under all input voltage and output
current conditions.
The ADP3050 is specified over the industrial temperature range
of −40°C to +85°C and is available in a thermally enhanced 8-lead
(not Pb-free only) SOIC package and a standard 8-lead (Pb-free
only) RoHS-compliant SOIC package.
Rev. C
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