PD-97022
Ultra Low Dropout
Positive Fixed Linear Regulator
Product Summary
Part Number
IRUH33P183A1M
IRUH33P183A1M
+3.3Vin to 1.8Vout at 3.0A
Dropout
1.1V
I
O
3.0A
V
in
3.3V
V
out
1.8V
8-LEAD FLAT PACK
Features:
The IRUH33P183A1M 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 1.0 Mrad(Si) per MIL-STD-883, Method
1019 at both high and low dose rates under biased and
unbiased conditions to account for ELDRS effects in bipolar
devices. The ultra low dropout voltage of 1.1V @ 3A makes
the part particularly useful for applications requiring low
noise and higher efficiency.
n
n
n
n
n
n
n
n
Total dose to 1.0 Mrad(Si) and low dose
capability to 500 Krad(Si) allows use in
space applications
Single Event latchup Immune
LET = 84 MeV/(mg/cm
2
)
Fluency = 1 x 10
9
Ions/cm
2
Low noise, higher efficiency
Ultra low dropout voltage of 1.1V@ 3A out
significantly reduces power consumption
Remote shutdown permits power
sequencing to be easily implemented
Hermetic 8-Lead Flat Pack ensures
higher reliability
Space Level Screened
This part is also available in MO-078 Package
as IRUH33P183B1M
Absolute Maximum Ratings
Parameter
Output Current
Input Voltage
Power Dissipation, T
C
= 25°C
Thermal Resistance, Junction to Case
Operating Temperature Range
Storage Temperature Range
Lead Temperature
Symbol
I
O
V
IN
P
TOT
R
THJC
T
J
T
S
T
L
Value
3.5
7.0
19
6.5
-55 to +125
-65 to +150
300
Units
A
V
W
°C/W
°C
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11/14/05
IRUH33P183A1M
Pre-Radiation
Electrical Characteristics @T
C
= 25°C (Unless Otherwise Specified)
Parameter
Test Conditions
V
IN
= 3.3V, I
O
= 1.5A
V
IN
= 2.97V, I
O
= 50mA
Output Voltage
V
IN
= 2.97V, I
O
= 3.0A
V
IN
= 3.63V, I
O
= 50mA
V
IN
= 3.63V, I
O
= 3.0A
Input Voltage Range - Operating
Dropout Voltage
Current Limit
Ripple Rejection
Shutdown Source Current
Shutdown Pin Threshold
I
O
= 3.0A
I
O
= 3.0A, V
OUT
= 2.5V
V
IN
= 5.0V, Overcurrent Latchup
F = 120Hz, I
O
= 50mA
V
IN
V
DROP
I
LATCH
I
SHDN
V
SHDN
V
OUT
Symbol
Min.
1.782
1.71
1.71
1.71
1.71
2.9
-
3.0
65
-
1.0
-0.1
Typ.
1.8
-
-
-
-
-
-
-
-
200
-
-
Max.
1.818
1.89
1.89
1.89
1.89
6.5
1.1
-
-
-
1.6
+0.1
Units
V
A
dB
µA
V
c
V
SHDN
= 5.0V
V
IN
= 5.0V
Output Voltage at Shutdown
V
IN
= 3.3V, I
O
= 50mA, V
SHDN
= +5.0V V
OUT (SHDN)
Pre-Radiation
Electrical Characteristics @T
C
= -55°C to 125°C (Unless Otherwise Specified)
Parameter
Test Conditions
V
IN
= 3.3V, I
O
= 1.5A
V
IN
= 2.97V, I
O
= 50mA
Output Voltage
V
IN
= 2.97V, I
O
= 3.0A
V
IN
= 3.63V, I
O
= 50mA
V
IN
= 3.63V, I
O
= 3.0A
Input Voltage Range - Operating
Dropout Voltage
Current Limit
Ripple Rejection
Shutdown Source Current
Shutdown Pin Threshold
I
O
= 3.0A
I
O
= 3.0A, V
OUT
= 2.5V
V
IN
= 5.0V, Overcurrent Latchup
F = 120Hz, I
O
= 50mA
V
IN
V
DROP
I
LATCH
I
SHDN
V
SHDN
V
OUT
Symbol
Min.
1.71
1.71
1.71
1.71
1.71
2.9
-
3.0
65
-
1.0
-0.1
Typ.
1.8
-
-
-
-
-
-
-
-
200
-
-
Max.
1.89
1.89
1.89
1.89
1.89
6.5
1.1
-
-
-
1.6
+0.1
Units
V
A
dB
µA
V
c
V
SHDN
= 5.0V
V
IN
= 5.0V
Output Voltage at Shutdown
V
IN
= 3.3V, I
O
= 50mA, V
SHDN
= +5.0V V
OUT (SHDN)
For notes, please refer to page 3
2
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IRUH33P183A1M
Post-Radiation
Electrical Characteristics @T
C
= 25°C (Unless Otherwise Specified)
Parameter
Test Conditions
V
IN
= 3.3V, I
O
= 1.5A
V
IN
= 2.97V, I
O
= 50mA
Output Voltage
V
IN
= 2.97V, I
O
= 3.0A
V
IN
= 3.63V, I
O
= 50mA
V
IN
= 3.63V, I
O
= 3.0A
Current Limit
Ripple Rejection
Output Voltage at Shutdown
V
IN
= 3.3V
F = 120Hz, I
O
= 50mA
V
IN
= 5.0V, I
O
= 50mA, V
SHDN
= +5.0V V
OUT (SHDN)
I
MAX
V
OUT
Symbol
Min.
1.71
1.71
1.71
1.71
1.71
3.0
40
-0.1
Typ.
1.8
-
-
-
-
-
-
-
Max.
1.89
1.89
1.89
1.89
1.89
-
-
+0.1
Units
V
A
dB
V
Notes for Electrical Characteristic Tables
V
Shutdown
ramp from 0.8V to 4.8V, output monitored for a 100mV drop below the nominal specification for V
out
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3
IRUH33P183A1M
Pre-Radiation Characteristics
OMR9601 Ripple Rejection vs. Frequency
3A
120
100
80
(db)
60
40
20
0
100
1.5A
.75A
.50A
1,000
10,000
Frequency (Hz)
100,000
1,000,000
Fig 1. Ripple Rejection Vs Frequency
Radiation Performance Characteristics
Test
Total Ionizing Dose (Gamma)
Conditions
MIL-STD-883, Method 1019
Operating Bias applied during exposure
Full Rated Load, Vin=3.3V
Min
1,000
Typ
Unit
Krads (Si)
Neutron Fluence
Single Event effects
SEU, SEL, SEGR, SEB
MIL-STD-883, Method 1017
Heavy Ions (LET)
Operating Bias applied during exposure
Full Rated Load, Vin=3.3 V
1.00E+09
1.00E+13
Neutrons/cm
2
84
MeV*cm /mg
2
4
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IRUH33P183A1M
Vin
Vin
100uF 16V
Tantalum
Vout
Vout
IRUH33P183A1M
SHDN
GND
1.0uFx10
Ceramic X 7R
1000uF 6.3V
Low ESR Tantalum
Ground
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, IRUH33P183A1M requires the use of output capacitors as
part of the device frequency compensation. The device requires a minimum of 220
µ
F 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 IRUH33P183A1M 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 20,000
µ
F without causing device to latch-off during start-up.
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