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IRUH330133BKA Datasheet(PDF) 5 Page - International Rectifier

Part # IRUH330133BKA
Description  Radiation Hardended Ultra Low Dropout Adjustable Positive Linear Regulator
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Manufacturer  IRF [International Rectifier]
Direct Link  http://www.irf.com
Logo IRF - International Rectifier

IRUH330133BKA Datasheet(HTML) 5 Page - International Rectifier

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IRUH3301A1BK
IRUH3301A1BP
Input Capacitance
Input bypass capacitors: Two (0.1
µF and 1µF) ceramics and two 100µF low ESR tantalums (AVX
TPS or equivalent), placed very close to the V
IN Pin are required for proper operation. When the
input voltage supply capacitance is more than 4 inches from the device, additional input
capacitance is recommended. Larger input capacitor values will improve ripple rejection further
improving the integrity of the output voltage.
Output Capacitance
Output bypass capacitors: Two (0.1µF and 1µF) ceramics and two 100µF low ESR tantalums
(AVX TPS or equivalent) are required for loop stability. Faster transient performance can be
achieved with multiple additional 1µF ceramic capacitors. Ceramic capacitors greater than 1µF in
value are not recommended as they can cause stability issues.
Tantalum capacitor values larger than the suggested value are recommended to improve the
transient response under large load current changes. The upper capacitance value limit is
governed by the delayed over-current latch function of the regulator and can be as much as
10,000µF without causing the device to latch-off during start-up.
General Layout Rules
Low impedance connections between the regulator output and load are essential. Solid power and
ground planes are highly recommended. In those cases where the board impedances are not kept
very small, oscillations can occur due to the effect of parasitic series resistance and inductance
on loop bandwidth and phase margin.
R1 must be directly conected to the V
OUT Pin using as short a trace as possible with the
connection inside the first bypass capacitor (see Fig. 2a). The trace from ADJ Pin to R1 should
be as short as possible.
Connect ceramic output capacitors directly across the V
OUT and GND Pins with as wide a trace as
design rules allow (see Fig. 2a). Avoid the use of vias for these capacitors and avoid loops. Fig.2
shows the ceramic capacitors tied directly to the regulator output.
Fig. 2a. Layer 1 conductor.
Ground plane below layer 1
Fig. 2b. Layer 1 silkscreen
The input capacitors should be connected as close a possible to the V
IN Pin.
Shutdown (SHDN)
The regulator can be shutdown by applying a voltage of >1.2V to the SHDN Pin. The regulator will
restart when the SHDN Pin is pulled below the shutdown threshold of 0.8V. If the remote shutdown
feature is not required, the SHDN Pin should be connected to GND.


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