资料介绍
Battery-operated equipment (most notably cell phones
and notebook computers) have created a strong
demand for linear regulators in small packages. While
such packages save space, they also have poor heat
transfer characteristics. To minimize power dissipation,
these regulators are designed to work with very low
input/output voltage differentials, hence the name “low
dropout regulators” or LDOs.
LDOs specify maximum output current and input
voltage limits, but blindly operating the LDO within
these limits will surely result in exceeding the maximum
power dissipation capability.M AN761
LDO Thermal Considerations
The conservation of power, states that power in must
Author: Paul Paglia,
equal power out. Consequently, input power is equal to
Microchip Technology Inc.
the power delivered to the load plus the power
dissipated in the LDO, (Equation 1):
INTRODUCTION
EQUATION 1:
Battery-operated equipment (most notably cell ph
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