TS2951
Taiwan Semiconductor
150mA Ultra Low Dropout Voltage Regulator
DESCRIPTION
The TS2951 are low power voltage regulators. These
devices are excellent choice for use in battery-powered
applications such as cordless telephone, radio control
systems, and portable computers.
The TS2951 is features very low quiescent current
(75µA Typ.) and very low drop output voltage (Typ.
40µV at light load and 380mV at 100mA). This includes
a tight initial tolerance of 1% (A version), extremely
good load and line regulation 0.05% typ. and very low
output temperature coefficient, making the TS2951
useful as a low-power voltage reference.
TS2951 have other key additional feature. The error flag
output feature is used as power-on reset for warn of a
low output voltage, due to following batteries on input.
The logic-compatible shutdown input which enable the
regulator to be switched on/off. The regulator output
voltage may be pin-strapped for a 5.0 & 3.3 & 3.0 of
programmed from 1.24V to 29V with external pair of
resistors. Using of as design, processing and testing
techniques
products.
make
TS2951
superior
over
similar
FEATURES
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Output voltage available in 5V, 3V & 3.3V
Extremely low quiescent current
Low dropout voltage
Extremely tight load and line regulation
Very low temperature coefficient
Need only 1µF for stability
Use as Regulator or Reference
Stable with low-ESR output capacitors
Current and thermal limiting
Error Flag warns of output dropout
Logic-Controlled electronic shutdown
Additional voltage tap
Output voltage sense
Output programmable from 1.24 to 29V
Battery powered systems
SMPS Post-Regulator and Voltage Reference
Voltage Reference
Portable consumer equipment
APPLICATION
SOP-8
Pin Definition:
1. Output
2. Sense
3. Shutdown
4. Ground
5.
6.
7.
8.
Error flag
Voltage tap
FB
Input
Notes:
Moisture sensitivity level: level 3. Per J-STD-020
TYPICAL APPLICATION CIRCUIT
Adjustable Regulator
Document Number: DS_P0000207
1
Version: G15
TS2951
Taiwan Semiconductor
ABSOLUTE MAXIMUM RATINGS
PARAMETER
Input Supply Voltage
Feedback Input Voltage
Shutdown Input Voltage
Error Comparator Output Voltage
Power Dissipation
Operating Junction Temperature Range
Storage Temperature Range
SYMBOL
V
IN
V
FB
V
SHUTDOWN
V
ERROR
P
D
T
J
T
STG
LIMIT
-0.3 ~ +30
-1.5 ~ +30
-0.3 ~ +30
-0.3 ~ +30
Internally Limited
-40 ~ +125
-65 ~ +150
UNIT
V
V
V
V
W
o
o
C
C
THERMAL PERFORMANCE
PARAMETER
Junction to Case Thermal Resistance
Junction to Ambient Thermal Resistance
SYMBOL
R
ӨJC
R
ӨJA
LIMIT
45
180
UNIT
°C/W
°C/W
Notes:
R
ӨJA
is the sum of the junction-to-case and case-to-ambient thermal resistances. The case thermal reference is defined
at the solder mounting surface of the drain pins. R
ӨJA
is guaranteed by design while R
ӨCA
is determined by the user’s board
design. R
ӨJA
shown below for single device operation on FR-4 PCB in still air.
ELECTRICAL SPECIFICATIONS
(V
IN
=V
OUT
+1V, T
A
=25
o
C, unless otherwise specified.)
PARAMETER
Output Voltage
Output Voltage Temperature
Coefficient
(Note 1)
(Note 3)
(Note 3)
CONDITIONS
(Note 2)
T
J
=25 C
Full Operating temp
100uA≤ I
L
≤100mA
o
MIN
|0.985|
|0.980|
|0.975|
--
--
TYP
5.0
3.3
3.0
50
20
0.04
0.1
50
380
75
8
110
160
0.05
430
100
160
1.235
MAX
|1.015|
|1.020|
|1.025|
150
100
0.2
0.3
80
450
120
12
170
200
0.2
--
--
--
1.27
UNIT
V
ppm/ C
%
%
mV
mV
µA
mA
µA
mA
%W
o
Line Regulation
6V≤ V
IN
≤30V
I
L
=100µA
I
L
=100mA
I
L
=100µA
I
L
=100mA
(Note 4)
--
--
--
--
--
--
--
--
--
--
1.21
Load Regulation
Dropout Voltage
Ground Current
100µA≤ I
L
≤100mA
(Note 5)
Dropout Ground Current
Current Limit
Thermal Regulation
Output Noise, 10Hz to 100KHz
Bypass=0.01uF
V
IN
= 4.5V, I
L
= 100uA
V
OUT
= 0
C
L
= 1µF
C
L
= 3.3µF
C
L
= 200µF
V
REF
≤
V
OUT
≤
(Vin-1V),
µV/ rms
V
Reference Voltage
(Note 6)
2.3≤ Vin≤ 30V,
100uA≤ I
L
≤
100mA,
T
J
≤
T
J
(max)
1.185
1.235
1.285
V
Document Number: DS_P0000207
2
Version: G15
TS2951
Taiwan Semiconductor
ELECTRICAL SPECIFICATIONS
(V
IN
=V
OUT
+1V, T
A
=25
o
C, unless otherwise specified.)
PARAMETER
Feedback Pin Bias Current
Reference Voltage Temperature
Coefficient
(Note 7)
CONDITIONS
(Note 2)
MIN
--
--
TYP
20
20
MAX
40
--
UNIT
nA
ppm/ C
o
o
Feedback Pin Bias Current
Temperature Coefficient
Output Leakage Current
Output Low Voltage
Upper Threshold Voltage
(Note 8)
(Note 8)
(Note 8)
--
V
OH
= 30V
V
IN
= 4.5V, I
OL
= 400µA
--
--
40
--
--
Low (Regulator ON)
High (Regulator OFF)
Vs = 2.4V
Vs = 30V
--
2.0
--
--
--
0.1
0.01
150
60
75
15
1.3
1.3
30
450
3
--
1
250
--
95
--
0.7
--
50
600
10
nA/ C
µA
mV
mV
mV
mV
V
Power Threshold Voltage
Hysteresis
Output Logic Voltage
Shut down Pin Current
Regulator Output Current
shutdown
µA
µA
Note:
1. Output voltage temperature coefficients defined as the worst case voltage change divided by the total temperature range.
o
2. Unless otherwise specified all limits guaranteed for T
J
= 25 C, V
IN
= 6V, I
L
= 100
µ
A and C
L
= 100
µ
F. Additional conditions for
the 8-pin versions are feedback tied to 5V, 3.3V & 3V tap output Sense (V
OUT
= 5V, 3.3V & 3V) and shutdown
≤
0.8V.
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 covered under the specification for thermal regulation.
o
o
4. Line regulation for the TS2951 is tested at 85 C for I
L
= 1mA. For I
L
= 100µA and T
J
= 125 C, line regulation is guaranteed by
design to 0.2%.
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 supply voltage of 2V
(2.3V over temperature) must be taken in to account.
6. V
REF
≤
V
OUT
≤
(Vin-1V), 2.3≤ Vin≤ 30V, 100
µ
A≤ I
L
≤
100mA, T
J
≤
T
J
(max)
.
7. Reference voltage temperature coefficient is defined as the worst case voltage change divided by the total temperature
range.
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, multiply by the
error amplifier gain= V
OUT
/ V
REF
= (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
V
OUT
as V
OUT
is varied with the dropout warning occurring at typically 5% below nominal, 7.5% guaranteed.
Document Number: DS_P0000207
3
Version: G15
TS2951
Taiwan Semiconductor
ORDERING INFORMATION
OUTPUT VOLTAGE
5.0V
3.3V
3.0V
PART NO.
TS2951CS50 RLG
TS2951CS33 RLG
TS2951CS30 RLG
PACKAGE
SOP-8
SOP-8
SOP-8
PACKING
2,500pcs / 13” Reel
2,500pcs / 13” Reel
2,500pcs / 13” Reel
Note:
1. Compliant to RoHS Directive 2011/65/EU and in accordance to WEEE 2002/96/EC.
2. Halogen-free according to IEC 61249-2-21 definition.
Document Number: DS_P0000207
4
Version: G15
TS2951
Taiwan Semiconductor
BLOCK DIAGRAM
APPLICATION INFORMATION
External Capacitors
For the stability of the TS2951 is requires a 1.0µF (0.22µF is recommended for 3.0V & 3.3V) or greater capacitor
between output and ground. Oscillation could occur without this capacitor. The tantalum or aluminum electrolytic
o
works fine; could use the film type work but are not cost efficient. For the operation of below -25 C solid tantalum is
o
recommended since the many aluminum type have electrolytes the freeze at about -30 C. The ESR of about 5Ω 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. At lower values of output current, less output capacitance is
required for stability. For the currents below 10mA 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 amplifier at
lower gain. At worst case 3.3≈F or greater must be used for condition of 100mA load at 1.250V output.
The TS2951 is 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, it is like CMOS RAM keep-alive. The TS2951
output voltage is set with minimum load of 1µA and external resistors.
If at the input ofTS2951 connected to battery or between AC filter capacitor and input is 10 inches wire then 1uF
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 TS2951. This could cause more problems when using higher value
of external to set the output voltage. To fix this problem the 100pF capacitor between output and feedback and
increasing output capacitance to 3.3µF.
Document Number: DS_P0000207
5
Version: G15
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