200 kHz, 1 A High-Voltage
Step-Down Switching Regulator
a
ADP3050
FEATURES
FUNCTIONAL BLOCK DIAGRAM
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
Thermally Enhanced 8-Lead SOIC Package
Configurable as a Buck, Buck-Boost and SEPIC
Regulator
BIAS
IN
CURRENT SENSE
AMPLIFIER
2.5V
REGULATOR
SD
GND
FREQUENCY
AND CURRENT LIMIT
FOLDBACK
CURRENT
LIMIT
APPLICATIONS
Industrial Power Systems
PC Peripheral Power Systems
Preregulator for Linear Regulators
Distributed Power Systems
Automotive Systems
+
200kHz
OSCILLATOR
BOOST
FB
CMP
Battery Chargers
S
R
Q
DRIVER
SWITCH
g
m
ADP3050
1.2V
COMP
GENERAL DESCRIPTION
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 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 that allows 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.
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.
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 ob-
tained by using the low voltage regulated output to provide the
device's internal operating current. A high switching frequency
allows the use of small external surface-mount components. A
wide variety of standard off-the-shelf devices can be used, pro-
viding a great deal of design flexibility. A complete regulator
design requires only a few external components.
The ADP3050 is specified over the industrial temperature range of
–40°C to +85°C and is available in a thermally enhanced 8-lead
SOIC package.
REV. 0
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