Analog Devices ADP2139 Evaluation Board ADP2139CB-2.8EVALZ ADP2139CB-2.8EVALZ Data Sheet
Product codes
ADP2139CB-2.8EVALZ
Evaluation Board User Guide
UG-249
One
Technology
Way
•
P.O.
Box
9106
•
Norwood,
MA
02062-9106,
U.S.A.
•
Tel:
781.329.4700
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Fax:
781.461.3113
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www.analog.com
Evaluation Board for the 800 mA, 3 MHz Buck Regulator
PLEASE SEE THE LAST PAGE FOR AN IMPORTANT
WARNING AND LEGAL TERMS AND CONDITIONS.
WARNING AND LEGAL TERMS AND CONDITIONS.
Rev. 0 | Page 1 of 8
FEATURES
Full-featured evaluation board for the ADP2138/ADP2139
Standalone capability
Simple device measurements, including line and load
Standalone capability
Simple device measurements, including line and load
regulation, demonstrable with
A single voltage supply
A voltage meter
A current meter
Load resistors
A single voltage supply
A voltage meter
A current meter
Load resistors
Easy access to external components
GENERAL DESCRIPTION
are high efficiency, low quiescent
current, synchronous step-down dc-to-dc converters. The
ADP2139 has the additional feature of an internal discharge
switch. The total solution requires only three tiny external
components.
ADP2139 has the additional feature of an internal discharge
switch. The total solution requires only three tiny external
components.
When the MODE pin is set high, the buck regulator operates in
forced PWM mode, which provides low peak-to-peak ripple for
power supply noise sensitive loads at the expense of light load
efficiency. When the MODE pin is set low, the buck regulator
automatically switches operating modes, depending on the load
current level. At higher output loads, the buck regulator operates
in PWM mode. When the load current falls below a predefined
threshold, the regulator operates in power save mode (PSM),
improving light load efficiency.
forced PWM mode, which provides low peak-to-peak ripple for
power supply noise sensitive loads at the expense of light load
efficiency. When the MODE pin is set low, the buck regulator
automatically switches operating modes, depending on the load
current level. At higher output loads, the buck regulator operates
in PWM mode. When the load current falls below a predefined
threshold, the regulator operates in power save mode (PSM),
improving light load efficiency.
The 3 MHz switching frequency minimizes the size of external
components. Full details on the ADP2138/ADP2139 are
provided in the ADP2138/ADP2139 data sheet available from
Analog Devices, Inc., which should be consulted in conjunction
with this data sheet.
components. Full details on the ADP2138/ADP2139 are
provided in the ADP2138/ADP2139 data sheet available from
Analog Devices, Inc., which should be consulted in conjunction
with this data sheet.
DIGITAL PICTURE OF THE EVALUATION BOARD
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Figure 1.