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PDF PJ2950 Data sheet ( Hoja de datos )
| Número de pieza | PJ2950 | |
| Descripción | (PJ2950 / PJ2951) 150mA Low Dropout Voltage Regulators | |
| Fabricantes | Promax Johnton | |
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PJ2950/PJ2951
150mA Low Dropout Voltage Regulators
T he Semiconductor PJ2950 and PJ2951 are a low power
voltage regulators. These devices are excellent choi ce
The error flag output feature is used as power-on reset
for warn of a low output voltage , due to following batteries
for use in battery-powered applications such as cordless
on input. Other feature is the logic-compatible shutdown
telephone, radio control systems, and portable computers.
input which enable the regulator to be switched on and off.
The PJ2950 and PJ2951 features very low quiescent
The PJ2950 is offered in 3-pin TO-92 package compatible
current (75μA Typ.) and very low drop output voltage
with other 5 volt regulators. The PJ2951 is available in 8-pin
(Typ. 40μV at light load and 380 mV at 100 mA).This
plastic, SOP-8 package.
includes a tight initial tolerance of 0.5% typ., extremely
The regulator output voltage may be pin-strapped for a
good load and line regulation 0.05% typ. and very low
5 & 3.3 volt of programmed from 1.24 volt to 29 volts with
output temperature coeffi cient, making the PJ2950/PJ2951
external pai r of resistors. Using of as design, processing and
useful as a low-power voltage reference. Other key
testing techniques make our PJ2950 and PJ2951 superior
additional feature of this unregulated input voltage transient
over similar products.
of -20V below ground (reverse battery).
____________________________________________________________________________________________________
FEATURES
• Output accuracy 5V & 3.3V, 150 mA output
T O-92
• Very low quiescent current
PJ2950/2950A
• Low dropout voltage
• Extremely tight load and line regulation
• Very low temperature coefficient
Pin 1. Output
2. Ground
3. Input
• Need only 1μF for stability
• Unregulated DC input can withstand -20V reverse
battery and +60V positive transients
• Direct replacem ent for PJ2950/PJ2951 sockets
PJ2951 VERSIONS ONLY
SOP-8
PJ2951/2951A
Pin
1. Output
2. Sense
3. Shutdown
4. Ground
5. Error
6. 5 Vtap
7. Feedback
8. Input
• Error Flag warns of output dropout
• Logic-Controlled electronic shutdown
• Output programmable from 1.24 to 29V
ORDERING INFORMATION
APPLICATIONS
• Battery powered systems
• Portable instrumentation
• Avionics
• Automotive Electronics
• SMPS Post-Regulator
• Voltage Reference
• Portable/Palm top / Notebook computers
• Portable consumer equipment
• Radio control systems
• Cordless telephones
Device
P J2950ACT
PJ2950CT
PJ2950ACT -3. 0
PJ2950CT -3. 0
PJ2950ACT -3. 3
PJ2950CT -3. 3
PJ2951ACS
PJ2951CS
PJ2951ACS-3.3
PJ2951CS-3.3
Operating Temperature
-20 ~ +85 ℃
Package
T O-92
SOP-8
1-7 2002/01.rev.A
1 page  
PJ2950/PJ2951
150mA Low Dropout Voltage Regulators
The PJ2951 output voltage is
programmable for any value from it
reference voltage of 1.250 volt
and it maximum rating of 30 volt .
For example for 5 volt needs to pin-
strapped and using the internal
voltage divider by tying pin 1 to 2
and pin 7 to pin 6. Refer to Figure
2, there are two ext ernal resistor
required for this programming .
REDUCING OUTPUT NOISE
It could be an advantage to reduce
the AC noise present at the output
One way is to reduce the regulator
bandwidth by increasing the value of
the output capacitor . this is the only
method that noise could reduce on
the PJ2950 but is relatively
inefficient , as increasing capacitor
from 1μF to 220μF only decreas es
the noise from 430μV to 160 μV
Refer to the below equation for the
programming the output voltage:
Volt = Vref x (1+R1\R2)+IFBR1
The Vref is 1.250 and IFB is the
feedback bias current , nominally -20
nA. The minimum recommended
load current of 1μA forces an upper
limit of 1.2MΩ on value of R2 , If
no load presented the IFB produces
error of typically 2% in Vout which
rms . for a 100KHz bandwidth at 5
volt output .
Noise could be also reduce by
fourfold by a bypass capacitor
across R1 since it reduces the high
frequency gain from 4 to unity . pick
CBYPASS = 1 / 2πR1 x 200Hz or
choose 0.01 μF . When doing this,
the output capacitor must be
increas ed to 3.3 μF to maintain
maybe eliminated at room
temperature by trimming R1 . To
improve the accuracy chooses the
value of R2 =100K and this
reduces the error by 0.17% and
increas es the resistor program
current by 12 μ A . The PJ2951
typically draw 60 μA at no load
with pin 2 open-circuit,and this
value does not look much .
stability . These changes the output
noise from 430μV rms . for a 100
kHz bandwidth 5 & 3.3 volt output.
With the bypass capacitor added,
noise no longer scales with output
voltage so that improvements are
more dramatic higher output
voltage .
FIGURE 1.ERROR OUTPUT TIMING
FIGURE 2.ADJUSTABLE REGULATOR
PJ2951
5-7 2002/01.rev.A
5 Page | ||
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| PDF Descargar | [ Datasheet PJ2950.PDF ] | |
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