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MIC38300HYHL Datasheet(PDF) 9 Page - Micrel Semiconductor

Part # MIC38300HYHL
Description  HELDO 3A High Efficiency Low Dropout Regulator
Download  12 Pages
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Manufacturer  MICREL [Micrel Semiconductor]
Direct Link  http://www.micrel.com
Logo MICREL - Micrel Semiconductor

MIC38300HYHL Datasheet(HTML) 9 Page - Micrel Semiconductor

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Micrel, Inc.
MIC38300
June 2010
9
M9999-061010-D
Application Information
Enable Input
The MIC38300 features a TTL/CMOS compatible
positive logic enable input for on/off control of the device.
High enables the regulator while low disables the
regulator. In shutdown the regulator consumes very little
current (only a few microamperes of leakage). For
simple applications the enable (EN) can be connected to
VIN (IN).
Input Capacitor
PVIN provides power to the MOSFETs for the switch
mode regulator section and the gate drivers. Due to the
high
switching
speeds,
a
10µF
capacitor
is
recommended close to PVIN and the power ground
(PGND) pin for bypassing.
Analog VIN (AVIN) provides power to the analog supply
circuitry. AVIN and PVIN must be tied together
externally. Careful layout should be considered to
ensure high frequency switching noise caused by PVIN
is reduced before reaching AVIN. A 1µF capacitor as
close to AVIN as possible is recommended.
Output Capacitor
The MIC38300 requires an output capacitor for stable
operation. As a µCap LDO, the MIC38300 can operate
with ceramic output capacitors of 10µF or greater.
Values of greater than 10µF improve transient response
and noise reduction at high frequency. X7R/X5R
dielectric-type ceramic capacitors are recommended
because of their superior temperature performance.
X7R-type capacitors change capacitance by 15% over
their operating temperature range and are the most
stable type of ceramic capacitors. Larger output
capacitances can be achieved by placing tantalum or
aluminum electrolytics in parallel with the ceramic
capacitor. For example, a 100µF electrolytic in parallel
with a 10µF ceramic can provide the transient and high
frequency noise performance of a 100µF ceramic at a
significantly lower cost. Specific undershoot/overshoot
performance will depend on both the values and
ESR/ESL of the capacitors.
For less than 5mV noise performance at higher current
loads, 20µF capacitors are recommended at LDOIN and
LDOOUT.
Low Pass Filter Pin
The MIC38300 features a Low Pass Filter (LPF) pin for
adjusting the switcher frequency. By tuning the
frequency, the user can further improve output ripple
without losing efficiency.
Adjusting the frequency is
accomplished by connecting a resistor between the LPF
and SW pins. A small value resistor would increase the
frequency while a larger value resistor decreases the
frequency. Recommended RLPF value is 25kΩ. Please
see Typical Characteristics for more details.
Adjustable Regulator Design
Adjustable Regulator with Resistors
The adjustable MIC38300 output voltage can be
programmed from 1V to 5.0V using a resistor divider
from output to the FB pin. Resistors can be quite large,
up to 100kΩ because of the very high input impedance
and low bias current of the sense amplifier. For large
value resistors (>50kΩ) R1 should be bypassed by a
small capacitor (CFF = 0.1µF bypass capacitor) to avoid
instability due to phase lag at the ADJ/SNS input.
The output resistor divider values are calculated by:
+
=
1
2
1
1
R
R
V
V
OUT
Efficiency Considerations
Efficiency is defined as the amount of useful output
power, divided by the amount of power supplied.
100
%
_
×
⎟⎟
⎜⎜
×
×
=
IN
IN
OUT
OUT
I
V
I
V
Efficiency
Maintaining high efficiency serves two purposes. It
reduces power dissipation in the power supply, reducing
the
need
for
heat
sinks
and
thermal
design
considerations and it reduces consumption of current for
battery powered applications. Reduced current draw
from a battery increases the devices operating time and
is critical in hand held devices.
There are two types of losses in switching converters;
DC losses and switching losses. DC losses are simply
the power dissipation of I
2R. Power is dissipated in the
high side switch during the on cycle. Power loss is equal
to the high side MOSFET RDSON multiplied by the Switch
Current
2. During the off cycle, the low side N-channel
MOSFET conducts, also dissipating power. Device
operating current also reduces efficiency. The product of
the quiescent (operating) current and the supply voltage
is another DC loss.
Over 100mA, efficiency loss is dominated by MOSFET
RDSON and inductor losses. Higher input supply voltages
will increase the Gate to Source threshold on the internal
MOSFETs, reducing the internal RDDSON. This improves
efficiency by reducing DC losses in the device. All but
the inductor losses are inherent to the device. In which


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