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ACT6305 Datasheet(PDF) 4 Page - List of Unclassifed Manufacturers

Part No. ACT6305
Description  Low Input High Efficiency Synchronous Step-Up DC-DC Converter
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Maker  ETC2 [List of Unclassifed Manufacturers]
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ACT6305 Datasheet(HTML) 4 Page - List of Unclassifed Manufacturers

   
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ACT6305
Figure 2. Functional Block Diagram
FUNCTIONAL DESCRIPTION
The ACT6305
comprises
a
reference,
feedback select error comparator, control logic
and timers, internal power MOSFETs and current
comparators. The Functional Block Diagram is
shown in Figure 2.
MAIN CONTROL LOOP
The ACT6305 control architecture utilizes a
series of one-shot and current sense circuits to
regulate the output voltage with very low
quiescent supply current of just 17µA. An ON
cycle begins when FB falls below the ACT6305's
internal reference voltage. During an ON cycle,
the N-channel power switch is turned on to
connect the LX node to ground, transferring
energy from input supply to the inductor. The ON
cycle persists until either the 5µs maximum ON
time is exceeded or the 1A current limit is
reached. When either or these conditions occur,
the N-channel power switch turns off and the
OFF cycle begins. During the OFF cycle, the
energy stored in the inductor is released into the
output
capacitor
and
load
through
the
synchronous rectifier. Once the 1µs minimum
OFF time expires, another ON cycle begins
when the FB voltage drops below the reference
voltage.
LIGHT LOAD OPERATION
Under
light
load
conditions,
the
IC
automatically enters a power-saving mode by
extending the OFF time. This reduces switching
losses and allows the ACT6305 to maintain high
efficiency across a very wide load range.
LOW VOLTAGE START UP
The ACT6305 uses proprietary start-up
circuitry that allows it to achieve very low voltage
startup down to 0.95V. The ACT6305 remains in
low-voltage startup mode until VOUT exceeds
1.85V. The ACT6305 cannot support it's full rated
load current when operating in low-voltage
startup mode, care should be taken to minimize
load current during startup.
SHUTDOWN
In shutdown mode, all internal circuits
including the power switch and the synchronous
rectifier are disabled, reducing quiescent supply
current to less than 1µA. Note that in shutdown
mode a DC path from the input supply to the
output still exists due to the body diode of the
synchronous rectifier.
Active-Semi, Inc.
- 4 -
www.active-semi.com


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