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ACE707C データシート(PDF) 4 Page - ACE Technology Co., LTD.

部品番号 ACE707C
部品情報  0.9 V startup, 1MHz, 300mA Iout, Low Iq, Synchronous Boost Converter
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メーカー  ACE [ACE Technology Co., LTD.]
ホームページ  http://www.ace-ele.com
Logo ACE - ACE Technology Co., LTD.

ACE707C データシート(HTML) 4 Page - ACE Technology Co., LTD.

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ACE707C
0.9 V startup, 1MHz, 300mA Iout, Low Iq, Synchronous Boost Converter
VER 1.1
4
Detail Description
ACE707C is a low input voltage start up, current mode DC-DC step up converter. It’s operation can be
best understood by referring to the block diagram. Upon starting up, the low voltage startup circuitry drives
SW with on-off cycles, transferring energy from input to OUT by storing energy in the inductor during
on-time and releasing it to the output during off-time. When OUT reaches 2V, the startup circuit turns off
and the main controller takes over. The main control loop consists of a reference, a GM error amplifier, a
PWM controller, a current sense amplifier, an oscillator, a PWM logic control, and it is power stage
including its driver. The main control loop is a classic current mode control loop. The GM stage integrates
the error between FB and REF, and its output is used to compare with a triangular wave which the
summing result of the current sense amplifier output and a slope compensation voltage. The output of the
comparator is used to drive the power stage to reach regulation.
Application Information
Inductor selection
With switching frequency up to 1MHz, small surface mount inductors can be used with values from
2.2uH to 4.7uH. For a given chosen inductor value and application conditions make sure the peak
inductor current does not exceed the maximum current rating of the selected vendor's inductor.
Input and output capacitor selection
The ACE707C's bootstrap architecture allows the use of very small input capacitor. For applications
that only need to drive small output load current, the input capacitor is optional, because once output is
started up, the IC's is powered by OUT, a quiet power supply.
The output capacitor is used to stabilize the loop and provide ac current to the load. A low ESR ceramic
cap with values from 2.2uF to 22uF can be used. Smaller value capacitors are generally cheaper with
small footprints, while larger capacitor provides lower ripples and better transient load responses. Also,
when extreme low startup voltage is needed, larger output capacitors are needed for the part to startup
under heavy load condition.


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