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PDF IRUH33PA13B20 Data sheet ( Hoja de datos )
| Número de pieza | IRUH33PA13B20 | |
| Descripción | Ultra Low Dropout Positive Adjustable Linear Regulator | |
| Fabricantes | International Rectifier | |
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PD-97029
Ultra Low Dropout
Positive Adjustable Linear Regulator
IRUH33PA13B20
+3.3Vin at 3.0A
Product Summary
Part Number Dropout
IRUH33PA13B20
0.4V
IO
3.0A
Vin
3.3V
Vout
1.265V To (VIN - 0.4V)
MO-078AA
The IRUH33PA13B20 is a space qualified, ultra low
dropout linear regulator designed specifically for space
applications. This product has been characterized to a total
ionizing dose of 200Krad(Si) per MIL-STD-883, Method
1019 at 200Krad at high dose and 100Krad at low dose
rates under biased and unbiased conditions to account for
ELDRS effects in bipolar devices. The ultra low dropout
voltage of 0.4V @ 3A makes the part particularly useful for
applications requiring low noise and higher efficiency.
Features:
n Total dose to 200Krad(Si) and low dose
capability to 30Krad(Si) allows use in
space applications
n Low noise, higher efficiency
n Ultra low dropout voltage of 0.4V@ 3A out
significantly reduces power consumption
n Remote shutdown permits power
sequencing to be easily implemented
n Hermetic MO-078AA (TO-258AA)
pack ensures higher reliability
n Space Level Screened
Absolute Maximum Ratings
Parameter
Output Current
Input Voltage
Output Voltage
Power Dissipation, TC = 25°C
Thermal Resistance, Junction to Case
Operating Temperature Range
Storage Temperature Range
Lead Temperature
www.irf.com
Symbol
IO
VIN
VOUT
PTOT
RTHJC
TJ
TS
TL
Value
3.5
7.0
1.265V To (VIN - 0.4V)
19
8.5
-55 to +125
-65 to +150
300
Units
A
V
W
°C/W
°C
1
03/22/06
www.DataSheet.in
1 page  
Vin
100uF 16V
Tantalum
PRELIMINARY
IRUH33PA13B20
Vin Vout
IRHU33PA13B20
SHDN
GND
ADJUST
RESISTOR
R1
Vout
1.0uF X10 1000uF 6.3V
CeramicX7R Low ESR Tantalum
Ground
Vout = Vref X ( 1+ R1/1000 )
Fig 2. Typical Application Circuit
Input Capacitance
Recommended input capacitance for a generic application is a 100µF, 16V tantalum capacitor. However, the
input capacitance is not critical to the stability of the regulator and is therefore application dependant. In
designs with a clean bus voltage that is situated close to the input of the regulator, only a small ceramic
capacitor will be needed to decouple high frequency noise. On the other hand , in designs with a noisy bus,
a larger capacitor will be needed. Care should be taken to ensure that the input to the regulator is sufficiently
free of noise and disturbances.
Output Capacitance
Like most ultra low dropout voltage regulators, IRUH33PA13B20 requires the use of output capacitors as
part of the device frequency compensation. The device requires a minimum of 220µF tantalum to ensure
stability.
Many different types of capacitor are available and have widely varying characteristics. These capacitors
differ in capacitor tolerance, equivalent series resistance (ESR), equivalent series inductance and capacitance
temperature coefficient. The IRUH33PA13B20 frequency compensation optimizes frequency response with
low ESR capacitors. In general, use capacitors with an ESR of less than 50mΩ for heavy load applications.
High quality bypass capacitors must be also be used to limit the high frequency noise generated by the load.
Multiple small ceramic capacitors are typically required to limit parasitic inductance (ESL) and ESR in the
capacitors to acceptable levels.
The upper limit of the capacitance is governed by the delayed over-current latch function of the regulator. The
regulator has a protection circuit that will latch the device off in the event of a short circuit. However, since it is
known that the regulator will draw a large in-rush current upon startup, the latch-off is delayed by about 10ms
to allow the outout capacitors to charge to a steady state without shutting down. During this period, the
regulator will have an output current at its maximum of around 5A typical. Therefore, the maximum output
capacitance can be as high as 20,000µF without causing device to latch-off during start-up.
www.irf.com
5
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| PDF Descargar | [ Datasheet IRUH33PA13B20.PDF ] | |
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