The MAX1958/MAX1959 evaluation (EV) kit demonstrates
an application circuit ideal for use with hetero-junction
bipolar transistor power amplifiers (HBT PA). The
MAX1958/MAX1959 application circuit features an
800mA DC-to-DC buck converter, an operational amplifier,
and a high-accuracy temperature sensor.
The high-efficiency, dynamically adjustable, pulse-width
modulated (PWM), DC-to-DC buck converter is optimized
to provide power to the HBT PA in N-CDMA and
W-CDMA cellular phones. The 1MHz PWM switching frequency
allows the use of small external components,
while skip mode reduces quiescent current to 190µA
with light loads. The buck regulator is dynamically controlled
to provide any fixed output voltage in the 0.75V to
3.4V (MAX1958) and 1V to 3.6V (MAX1959) ranges. The
DC-to-DC converter utilizes a low on-resistance internal
MOSFET switch and synchronous rectifier to maximize
efficiency and minimize external component count.
The built-in operational amplifier is used to provide full
bias control for the PA to maximize efficiency. The
amplifier has rail-to-rail input/output capability,
800kHz gain-bandwidth product, and 120dB open-loop
voltage gain. An added feature of the amplifier is an
active output discharge in shutdown mode.
The precision temperature sensor measures temperatures
between -40°C and +125°C.
This fully tested EV kit comes with the MAX1958 IC
installed. The MAX1959 has an identical pinout
arrangement and can be evaluated on this board. To
evaluate the MAX1959, request a free sample of the
MAX1959 when ordering this evaluation kit.
Key Features
Buck Converter
Dynamically Adjustable Output from 0.75V to
3.4V (MAX1958)
Dynamically Adjustable Output from 1V to
3.6V (MAX1959)
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