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MIC24420 Datasheet(PDF) 15 Page - Micrel Semiconductor

Part No. MIC24420
Description  2.5A Dual Output PWM Synchronous Buck Regulator IC
Download  34 Pages
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Maker  MICREL [Micrel Semiconductor]
Homepage  http://www.micrel.com
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MIC24420 Datasheet(HTML) 15 Page - Micrel Semiconductor

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Micrel, Inc.
MIC24420/MIC24421
June 2012
15
M9999-062012-C
Voltage Setting Components
The regulator requires two external resistors to set the
output voltage as shown in Figure 8.
Figure 8. Setting the Output Voltage
The output voltage is determined by the equation below.
⎛ +
×
=
R2
R1
1
V
V
REF
OUT
Where: VREF is 0.7V nominal.
If the voltage divider resistance is used to provide the
minimum load (see EN/DLY section) then R1 should be
low enough to provide the necessary impedance.
Once R1 is selected, R2 can be calculated with the
following formula.
REF
OUT
REF
V
V
R1
V
R2
×
=
Ω
<
+
2k
R1
R2
And
Minimum Pulse Width
Output voltage is regulated by adjusting the on-time
pulse width of the high-side MOSFET. This is
accomplished by comparing the error amplifier output
with a sawtooth waveform (see block diagram). The
pulse width output of the comparator becomes smaller
as the error amplifier voltage decreases. Due to
propagation delay and other circuit limitations, there is a
minimum pulse width at the output of the comparator. If
the error amplifier voltage drops any further, the output
of the comparator will be low.
The PWM circuit will skip pulses if a smaller duty cycle is
required to maintain output voltage regulation. This
effectively cuts the output frequency in half.
Thermal Protection
The internal temperature of the regulator is monitored to
prevent damage to the device. Both outputs are inhibited
from switching if the over-temperature threshold is
exceeded. Hysteresis in the circuit allows the regulator
to cool before turning back on.


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