CYStech Electronics Corp.
100mA Low Dropout Voltage Regulators
Spec. No. : C503Q8
Issued Date : 2003.03.21
Revised Date :
Page No. : 1/5
PL2951-XXQ8
FEATURES
•
Battery powered systems
•
Cordless telephones
•
Radio control systems
•
Portable/Palm top/Notebook computers
•
Portable consumer equipment
•
Portable Instrumentation
•
Avionics
•
Automotive Electronics
•
SMPS Post-Regulator
•
Voltage Reference
APPLICATIONS
•
High accuracy output voltage
•
Guaranteed 100mA output
•
Very low quiescent current
•
Low dropout voltage
•
Extremely tight load and line regulation
•
Very low temperature coefficient
•
Needs only 1µF for stability
•
Error Flag warns of output dropout
•
Logic-Controlled electronic shutdown
•
Output programmable from 1.24 to 29V
PRODUCT DESCRIPTION
The PL2951-XX is a low power voltage regulator. This device excellent choice for use in battery powered
application such as cordless telephone, radio control systems, and portable computers.
The PL2951-XX features very low quiescent current (75µA Typ.) and very low drop output voltage (Typ.
40mV at light load and 380mV at 100mA). This includes a tight initial tolerance of 0.5% typ., extremely
good load and line regulation of 0.05% typ., and very low output temperature coefficient, making the
PL2951-XX useful as a low-power voltage reference.
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 PL2951-XX is available in 8-pin plastic packages. The regulator output voltage may be pin-strapped
for a -XX volt or programmed from 1.24 volt to 29 volts with external pair of resistors.
Absolute Maximum Ratings
Power Dissipation
Lead Temperature
(Soldering, 5 seconds)
Storage Temperature Range
Operating Junction Temperature
Range
Input Supply Voltage
Feedback Input Voltage
Shutdown Input Voltage
Error Comparator Output
Internally Limited
260℃
-65°C to+150°C
-55°C to +150°C
-0.3 to +30V
-1.5 to +30V
-0.3 to +30V
-0.3 to +30V
Pin Connection
error
PL2951Q8
CYStek Product Specification
CYStech Electronics Corp.
Device Selection Guide
Vout
, Volts
Spec. No. : C503Q8
Issued Date : 2003.03.21
Revised Date :
Page No. : 2/5
Device
PL2951-2.85
PL2951-3.0
PL2951-3.3
PL2951-5.0
* - other versions are also available
Vout = 2.0V to 5.0V. Please consult factory for
more information
2.85*
3.0
3.3
5.0
ELECTRICALCHARACTERISTICS (at Ta =25℃, =15V;unless otherwise noted
)
Parameter
Output Voltage
Output Voltage
Output Voltage Temperature
Coefficient
Line Regulation(Note 3)
Load Regulation(Note 3)
Dropout Voltage(Note 5)
Ground Current
Conditions(Note
2)
-25℃≤T
J
≤85℃
Full Operating Temperature
100μA≤I
L
≤100mA,T
J
≤T
JMAX
(Note 1)
V
O
+1V≤Vin≤30V(Note 4)
100μA≤I
L
≤100mA
I
L
=100μA
I
L
=100mA
I
L
=100μA
I
L
=100mA
Vin=Vo-0.5V,I
L
=100μA
Vout=0
Min
0.985∣Vo∣
0.98∣Vo∣
0.976∣Vo∣
-
-
-
-
-
-
-
-
-
Typ
Vo
Vo
50
0.04
0.1
50
380
75
8
110
160
0.05
430
160
100
1.235
-
20
50
0.1
0.01
150
60
75
15
1.3
-
30
450
-
3
-
-
Max
1.015∣Vo∣
1.02∣Vo∣
1.024∣Vo∣
150
0.4
0.3
80
450
120
12
170
200
0.2
-
Units
V
ppm/℃
%
%
mV
ΜA
mA
μA
mA
%/W
μVrms
Dropout Ground Current
Current Limit
Thermal Regulation
Output Noise, 10Hz to 100KHz C
L
=1μF
C
L
=200μF
C
L
=3.3μF
(Bypass=0.01μF, pins 7 to 1)
Reference Voltage
Reference Voltage
Over Temperature(Note 6)
Feedback Pin Bias Current
Reference Voltage Temperature (Note 7)
Coefficient
Feedback Pin Bias Current
Temperature Coefficient
Error Comparator
Output Leakage Current
Voh=30V
Output Low Voltage
Vin=4.5V,I
OL
=400μA
Upper Threshold Voltage
(Note 8)
Lower Threshold Voltage
(Note 8)
Hysteresis
(Note 8)
Shutdown Input
Input Logic Voltage
Low(Regulator ON)
High(Regulator OFF)
Shutdown Pin Input Current
Vs=2.4V
Vs=30V
Regulator Output Current in
(Note 9)
Shutdown
V
OUT
=5V
3.3V≤V
OUT
≤5.0V
2.0V≤V
OUT
≤3.3V
PL2951Q8
1.21
1.185
-
-
-
-
-
40
-
-
-
2
-
-
-
-
-
-
1.26
1.285
40
-
-
1.0
250
-
95
-
0.7
-
50
600
-
10
20
30
V
nA
ppm/℃
nA/℃
μA
mV
V
μA
CYStek Product Specification
CYStech Electronics Corp.
total temperature range.
Spec. No. : C503Q8
Issued Date : 2003.03.21
Revised Date :
Page No. : 3/5
Note 1:Output or reference voltage temperature coefficients defined as the worse case voltage change divided by the
Note 2:Unless otherwise specified all limits guaranteed for T
J
=25℃,Vin=Vo+1V,I
L
=100μA and C
L
=1μF.
Feedback pin tied to
–XX
V tap pin and output tied to output sense (Vout=XX V) and V
shutdown
≤0.8V.
Note 3.Regulations is measured at constant junction temperature, using pulse testing with a low duty cycle.
Changes in output voltage due to heating effects are covered under the specification for thermal regulation.
Note 4:Line regulation is tested at 150
℃
for I
L
=1mA. For I
L
=100μA and T
J
=125
℃,
line regulation is guaranteed
by design to 0.2%.
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 values of programmed output voltage, the mini-
mum input supply voltage of 2V(2.3V over temperature) must be taken into account.
Note 6:Vref≤Vout≤(Vin-1V),2.3V≤Vin≤30V,100μA≤I
L
≤100mA,T
J
≤T
JMAX
.
Note 7:Output or reference voltage temperature coefficient is defined as the worst case voltage change divided by
the total temperature range.
Note 8:Comparator thresholds are expressed in terms of a voltage differential at the feedback terminal below the
nominal reference voltage measured at Vo+1V input. To express these thresholds in terms of output voltage
change, multiply by the error amplifier gain = Vout/Vin=(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 95mV×5V/1.235=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 –XX V tap.
Block Diagram and Typical Applications
Vo=XX V
100mA Max
7
FEEDBACK
8
INPUT
1
OUTPUT
SENSE
2
XX V TAP
3
SHUTDOWN
60mV
6
CAP
ERROR AMPLIFIER
TO CMOS
OR TTL
ERROR
5
1.23V
REF
GROUND
4
PL2951Q8
CYStek Product Specification
CYStech Electronics Corp.
Spec. No. : C503Q8
Issued Date : 2003.03.21
Revised Date :
Page No. : 4/5
+V
IN
100kΩ
V
IN
ERROR OUTPUT
5
ERROR
8
1
V
OUT
V
OUT
1.2V to 30V
R1
0.01µF
+
3.3μF
SHUTDOWN INPUT
OFF
3
SD
GND
4
FB
7
1.23V
R2
VREF
ON
NOTE:PINS 2 AND 6 ARE LEFT OPEN
VOUT=VREF (1+R1/R2)
PL2951Q8
CYStek Product Specification
CYStech Electronics Corp.
SO-8 Dimension
Top View
A
Right side View
G
Spec. No. : C503Q8
Issued Date : 2003.03.21
Revised Date :
Page No. : 5/5
Marking:
I
B
C
H
2951
J
D
Front View
Part A
E
Part A
K
L
N
O
8-Lead SO-8 Plastic Package
CYStek Package Code: S8
M
F
*: Typical
DIM
A
B
C
D
E
F
G
H
Inches
Min.
Max.
0.1909
0.2007
0.1515
0.1555
0.2283
0.2441
0.0480
0.0519
0.0145
0.0185
0.1472
0.1527
0.0570
0.0649
0.1889
0.2007
Millimeters
Min.
Max.
4.85
5.10
3.85
3.95
5.80
6.20
1.22
1.32
0.37
0.47
3.74
3.88
1.45
1.65
4.80
5.10
DIM
I
J
K
L
M
N
O
Inches
Min.
Max.
0.0019
0.0078
0.0118
0.0275
0.0074
0.0098
0.0145
0.0204
0.0118
0.0197
0.0031
0.0051
0.0000
0.0059
Millimeters
Min.
Max.
0.05
0.20
0.30
0.70
0.19
0.25
0.37
0.52
0.30
0.50
0.08
0.13
0.00
0.15
Notes:
1.Controlling dimension: millimeters.
2.Maximum lead thickness includes lead finish thickness, and minimum lead thickness is the minimum thickness of base material.
3.If there is any question with packing specification or packing method, please contact your local CYStek sales office.
Material:
•
Lead: 42 Alloy; solder plating
•
Mold Compound: Epoxy resin family, flammability solid burning class: UL94V-0
Important Notice:
•
All rights are reserved. Reproduction in whole or in part is prohibited without the prior written approval of CYStek.
•
CYStek reserves the right to make changes to its products without notice.
•
CYStek
semiconductor products are not warranted to be suitable for use in Life-Support Applications, or systems.
•
CYStek assumes no liability for any consequence of customer product design, infringement of patents, or application assistance.
PL2951Q8
CYStek Product Specification
