PJ2951CS-3.3 [ETC]
150mA Low Dropout Voltage Regulators; 150毫安低压差稳压器
| 型号： | PJ2951CS-3.3 |
| 厂家： | 
ETC |
| 描述： | 150mA Low Dropout Voltage Regulators |
| 文件： | 总7页 (文件大小：103K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
PJ2950/PJ2951
150mA Low Dropout Voltage Regulators
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
on input. Other feature is the logic-compatible shutdown
input which enable the regulator to be switched on and off.
The PJ2950 is offered in 3-pin TO-92 package compatible
with other 5 volt regulators. The PJ2951 is available in 8-pin
plastic, SOP-8 package.
T
for use in battery-powered applications such as cordless
telephone, radio control systems, and portable computers.
The PJ2950 and PJ2951 features very low quiescent
current (75μA Typ.) and very low drop output voltage
(Typ. 40μV at light load and 380 mV at 100 mA).This
includes a tight initial tolerance of 0.5% typ., extremely
good load and line regulation 0.05% typ. and very low
output temperature coefficient, making the PJ2950/PJ2951
useful as a low-power voltage reference. Other key
additional feature of this unregulated input voltage transient
of -20V below ground (reverse battery).
The regulator output voltage may be pin-strapped for a
5 & 3.3 volt of programmed from 1.24 volt to 29 volts with
external pair of resistors. Using of as design, processing and
testing techniques make our PJ2950 and PJ2951 superior
over similar products.
____________________________________________________________________________________________________
FEATURES
TO-92
•
•
•
•
•
•
•
Output accuracy 5V & 3.3V, 150 mA output
Very low quiescent current
PJ2950/2950A
Low dropout voltage
Pin 1. Output
2. Ground
3. Input
Extremely tight load and line regulation
Very low temperature coefficient
Need only 1μF for stability
PJ2951/2951A
Unregulated DC input can withstand -20V reverse
battery and +60V positive transients
Direct replacement for PJ2950/PJ2951 sockets
SOP-8
Pin
1. Output
5. Error
2. Sense
6. 5 Vtap
•
3. Shutdown 7. Feedback
4. Ground 8. Input
PJ2951 VERSIONS ONLY
•
Error Flag warns of output dropout
Logic-Controlled electronic shutdown
Output programmable from 1.24 to 29V
•
•
ORDERING INFORMATION
Device
Operating Temperature
Package
APPLICATIONS
PJ2950ACT
•
Battery powered systems
Portable instrumentation
Avionics
TO-92
PJ2950CT
•
•
•
•
•
•
•
•
•
PJ2950ACT-3.0
PJ2950CT-3.0
PJ2950ACT-3.3
PJ2950CT-3.3
PJ2951ACS
Automotive Electronics
SMPS Post-Regulator
Voltage Reference
-20 ~ +85 ℃
Portable/Palm top / Notebook computers
Portable consumer equipment
Radio control systems
Cordless telephones
SOP-8
PJ2951CS
PJ2951ACS-3.3
PJ2951CS-3.3
1-7
2002/01.rev.A
PJ2950/PJ2951
150mA Low Dropout Voltage Regulators
ABSOLUTE MAXIMUM RATINGS
Power Dissipation......................Internally Limited
Lead Temp.(Soldering, 5 Seconds)................260℃
Storage Temperature Range.............-65 to +150℃
Operating Junction Temperature Range
Input Supply Voltage.......................….. -20 to +60V
Feedback Input Voltage.........................-1.5 to +30V
Shutdown Input Voltage......................... -0.3 to+30V
Error Comparator Output...................…..-0.3 to +30V
ECD Rating is to be determined
PJ2951........................................….. -20 to +125℃
PJ2950A / PJ2950
PJ2951A / PJ2951...................…......-20 to +125℃
ELECTRICAL CHARACTERISTICS at Vs=15V, Ta=25℃, unless otherwise noted.
CONDITIONS
(Note 2)
PJ2950A/PJ2951A
Typ
PJ2950/PJ2951
Typ
UNITS
PARAMETER
Min
Max
Min
Max
Output Voltage
TJ=25℃
0.995|Vo| 5.0 / 3.3 1.005|Vo| 0.990|Vo| 5.0 / 3.3 / 1.010|Vo|
V
-25℃≤ TJ≤85℃
Full Operating Temp.
100μA≤ IL≤100mA
TJ≤ TJM AX
0.990|Vo| / 3.0
0.988|Vo|
0.986|Vo|
1.010|Vo| 0.985|Vo| 3.0
1.012|Vo| 0.983|Vo|
1.014|Vo| 0.985|Vo|
1.015|Vo|
1.017|Vo|
1.015|Vo|
Output Voltage
V
Output Voltage
Temperature
Coefficient
(Note 1)
20
50
ppm/℃
Line Regulation
(Note 3)
6V≤Vin≤30V (Note 4)
100μA≤IL≤100mA
0.03
0.04
0.2
0.1
0.04
0.1
0.2
0.2
%
%
Load Regulation
(Note 3)
Dropout Voltage
(Note 5)
IL=100μA
IL=100mA
IL=150mA
40
250
300
75
1.7
4
80
300
450
120
2.5
6
40
250
300
75
1.7
4
80
300
450
120
2.5
6
mV
mV
mV
μA
mA
mA
μA
Ground Current
IL=100μA
IL=100mA
IL=150mA
Dropout Ground
Current
Vin=4.5V, IL=100μA
110
170
110
170
Current Limit
Thermal Regulation
Output Noise,
10Hz to 100KHz
Vout=0
150
0.05
430
160
100
200
0.2
150
0.05
430
160
100
200
0.2
mA
%W
μVms
CL=1μF
CL=200μF
CL=13.3μF
(Bypass=0.01μF
pins 7 to 1 PJ2951)
8-Pin Versions only
PJ2951A
PJ2951
Reference Voltage
Reference Voltage
1.238
1.19
1.250
1.262
1.27
1.238
1.18
1.250
1.262
1.28
V
V
Over Temperature
(Note 6)
Feedback Pin Bias
Current
20
20
40
20
50
40
nA
Reference Voltage
Temperature
Coefficient
(Note 7)
ppm/℃
Feedback Pin Bias
Current
0.1
0.1
nA/℃
Temperature
Coefficient
2-7
2002/01.rev.A
PJ2950/PJ2951
150mA Low Dropout Voltage Regulators
APPLICATION HINTS EXTERNAL CAPACITORS
CONDITIONS
(Note 2)
PJ2950A/PJ2951A
PJ2950/PJ2951
PARAMETER
Min.
Typ.
Max
Min.
Typ.
Max
UNITS
Error Comparator
Output Leakage
Current
Output Low
Voltage
Voh=30V
0.01
150
60
1
1
μA
mV
mV
mV
mV
Vin = 4.5V
Iol = 400μA
(Note 8)
250
150
60
250
Upper Threshold
Voltage
40
40
Power Threshold
Voltage
(Note 8)
(Note 8)
75
95
75
95
Hysteresis
15
15
Shutdown Input
Output Logic
Voltage
Low (Regulator ON)
High(Regulator
OFF)
1.3
0.7
1.3
0.7
V
2
2
Shut down Pin
Input Current
Regulator Output
Current in
Vs =2.4V
Vs = 30V
30
450
3
50
600
10
30
450
3
50
600
10
μA
μA
(Note 9)
Shutdown
Note 1: Output or reference voltage temperature coefficients
defined as the worst case voltage change divided by the total
temperature range.
supply voltage of 2V (2.3V over temperature) must be
taken in to account .
Note 6: Vref ≤ Vout ≤ (Vin-1V),2.3≤ Vin≤ 30V, 100μA≤ IL ≤
100mA, TJ ≤TJMAX..
Note 2: Unless otherwise specified all limits guaranteed for
Tj=25℃, Vin =6V,IL=100μA and CL=100μF. Additional
conditions for the 8-pin versions are feedback tied to 5V &
Note 7: Output or reference voltage temperature coefficient
is defined as the worst case voltage change divided by the
total temperature range.
3.3V tap output Sense (Vout =5V & 3.3V) and Vshutdown
0.8V.
≤
Note 8: Comparator thresholds are expressed in terms of a
voltage differential at the feedback terminal below the
nominal reference voltage measured at 6V input . To
express these thresholds in terms of output voltage change ,
Note 3:Regulation is measured at constant junction
temperature , using pulse testing with a low duty cycle.
Changes in output voltage due to heating effects are
convered under the specification for thermal regulation.
Note 4:Line regulation for the PJ2951 is tested at 150℃ for
IL=1mA.For IL=100μA and Tj=125℃, line regulation is
guaranteed by design to 0.2%. See typical performance
characteristics for line regulation versus temperature and
load current .
multiply
by
the
error
amplifier
gain=Vout/Vref=(R1+R2)/R2.
For example, at a
programmed output voltage of 5V, the Error output is
guaranteed to go low when the output drops by 95 mV X
5V/1.250=384mV. Thresholds remain constant as a percent
of Vout as Vout is varied. with the dropout warning
occurring at typically 5% below nominal, 7.5% guaranteed.
Note 9:Vshutdown≡2V, Vin ≤ 30V,Vout =0, Feedback pin tied
to 5V & 3.3VTap.
Note 5:Dropout Voltage is defined as the input to output
differential at which the output voltage drops 100mV below
its nominal value measured at 1V differential at very low
value of programmed output voltage , the minimum input
3-7
2002/01.rev.A
PJ2950/PJ2951
150mA Low Dropout Voltage Regulators
PROGRAMMING THE OUTPUT VOLTAGE OF PJ2951
External Capacitors
For the
stability
of the
less output capacitance is required
for stability. For the currents below
10 mA the value of capacitor can be
reduce to 0.33μF and 0.1μF for
1mA. More output capacitance
needed for the 8-pin version at
voltage below 5V since it runs the
error amplifi er at lower gain. At
worst case 3.3μF or greater must be
used for condition of 100mA load at
1.250V output .
voltage setting with minimum load
of 1 μA and external resistors.
PJ2950/PJ2951 requires a 1.0 μF or
greater capacitor between output and
ground. Oscillation could occur
without this capacitor. The tantalum
or aluminum electrolytic works fine;
could use the fiLP type but are not
cost effi cient. For the operation of
below -25 ℃ solid tantalum is
recommended since the many
aluminum type have electrolytes the
freeze at about -30℃. The ESR of
about 5 Ω or less and resonant
frequency above 500KHz are most
important parameter in the value of
Capacitor. The Capacitors value can
be increased without any limit.
If at the input of PJ2950/LP
2951 connected to battery or between
AC filter capacitor and input is 10
inches wire then 1μF tantalum or
aluminum
electrolytic capacitor
should be connected between input
and ground .
Instability can occur
if stray
capacitor to feedback terminal pin 7
of the PJ2951. This could cues more
problem more when using higher
value of external to set the output
voltage . To fix this problem the 100
pF capacitor between output and
feedback and increasing output
capacitance to 3.3μF.
The PJ2950 not like other low
dropout regulators will remain stable
and regulation with no load in
addition to the internal voltage
divider. This feature very important
in application like CMOS RAM
keep-alive. The PJ2951 output
At lower values of output current,
ERROR DETECTION COMPARATOR OUTPUT
The Compactor produces a logic
low output whenever the PJ2951
output falls of regulation by more
than around 5% . This is around 60
mV offset divided by the 1.250
reference voltage. Thus trip remains
5% below nominal regardless of the
programmed output voltage of the
regulator . the figure 1 shows the
signal becomes low at around 1.3 V
Depending
on
the
system
input , it goes high around 5Volt
input , (input voltage at which Vout
= 4.75). The PJ2951 dropout voltage
depending on the load , the input
voltage trip point around 5 volt will
vary with load current. The output
voltage trip point is around 4.75 volt
it does not change with load.
requirement
the resistor maybe
returned to 5 or 3.3 volt output or
other supply voltage depending to
the system requirements. For
determining the size of the resistor,
note that the output is sinking 400μ
A , this value adds to battery drain in
a low better condition, recommended
values 100K to 1MΩ. If the output
is unused this resistor
timing diagram
depicting the
The error comparator has an open-
collector output which requires an
ERROR signal and the regulator
output voltage as the PJ2951 input is
ramped up and down . the ERROR
external
pull-up resistor.
is not required.
4-7
2002/01.rev.A
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 .
Refer to the below equation for the
programming the output voltage:
maybe
eliminated
at
room
temperature by trimming R1 . To
improve the accuracy chooses the
Volt = Vref x (1+R1\R2)+IFB R1
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
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 .
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
rms . for a 100KHz bandwidth at 5
volt output .
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 .
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
FIGURE 1.ERROR OUTPUT TIMING
FIGURE 2.ADJUSTABLE REGULATOR
PJ2951
5-7
2002/01.rev.A
PJ2950/PJ2951
150mA Low Dropout Voltage Regulators
BLOCK DIAGRAM AND TYPICAL APPLICATIONS
6-7
2002/01.rev.A
PJ2950/PJ2951
150mA Low Dropout Voltage Regulators
MILLIMETERS
INCHES
MIN
DIM
A
B
C
D
MIN
4.80
3.80
1.35
0.35
0.40
MAX
5.00
4.00
1.75
0.49
1.25
MAX
0.196
0.157
0.068
0.019
0.049
0.189
0.150
0.054
0.014
0.016
F
G
1.27BSC
0.05BSC
K
M
P
0.10
0°
5.80
0.25
0.25
7°
6.20
0.50
0.004
0°
0.229
0.010
0.009
7°
0.244
0.019
R
7-7
2002/01.rev.A
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