TS2950A Datasheet PDF - Taiwan Semiconductor


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TS2950A
Taiwan Semiconductor

Part Number TS2950A
Description 150mA Ultra Low Dropout Voltage Regulator
Page 9 Pages

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TO-92
Pin Definition:
1. Output
2. Ground
3. Input
TS2950/A
150mA Ultra Low Dropout Voltage Regulator
TO-252
(DPAK)
Pin Definition:
1. Input
2. Ground
3. Output
General Description
The TS2950/A 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 TS2950/A is features very low quiescent current (75uA Typ.) and very low drop output voltage (Typ. 40uV at
light load and 380 mV at 100 mA). 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 TS2950/A useful as a low-
power voltage reference.
Features
Extremely low quiescent current
Low dropout voltage
Extremely tight load and line regulation
Very low temperature coefficient
Need only 1uF for stability
Use as Regulator or Reference
Stable with low-ESR output capacitors
Current and thermal limiting
Application
Battery powered systems
SMPS Post-Regulator
Voltage Reference
Portable consumer equipment
Radio control system
Ordering Information
Part No.
Package
Packing
TS2950CTxx B0
TO-92
1Kpcs / Bulk
TS2950CTxx A3
TO-92
2Kpcs / Ammo
TS2950ACTxx B0
TO-92
1Kpcs / Bulk
TS2950ACTxx A3
TO-92
2Kpcs / Ammo
TS2950CPxx RO
TO-252 2.5Kpcs / 13” reel
Note: Refer to detail ordering information table.
Absolute Maximum Rating
Parameter
Input Supply Voltage
Power Dissipation
Operating Junction Temperature Range
Storage Temperature Range
Lead Temperature (Soldering 5 second)
Thermal Resistance Junction to Ambient
Thermal Resistance Junction to Case
Symbol
VIN
Pd
TJ
TSTG
TSTG
RӨJA
RӨJC
Limit
TO-92
TO-252
- 0.3 ~ +30
Internally Limited
- 40 ~ +125
-65 ~ +150
260
160 100
80 2.87
Unit
V
W
oC
oC
oC
oC/W
oC/W
1/10 Version: E11



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TS2950/A
150mA Ultra Low Dropout Voltage Regulator
Electrical Characteristics (VIN=VOUT +1V, Ta=25oC, unless otherwise specified.)
Parameter
Test Conditions (note 2)
Min Typ
Max
Unit
Output Voltage
Tj=25oC
Full Operating temp
100uAIL 100mA
TjTj(max)
TS2950
TS2950A
TS2950
TS2950A
TS2950
TS2950A
|0.985|
|1.015|
|0.990|
|1.010|
5.0
|0.980|
|1.020|
3.3
|0.988|
|1.012|
3.0
|0.975|
|1.025|
|0.985|
|1.015|
V
Output Voltage Temperature
Coefficient
Line Regulation (Note 3)
Load Regulation (Note 3)
Dropout Voltage (Note 5)
Ground Current
Dropout Ground Current
Current Limit
Thermal Regulation
(Note 1)
TS2950
TS2950A
6VVIN 30V (Note 4)
100uAIL 100mA
IL=100uA
IL=100mA
IL=100uA
IL=100mA
VIN= 4.5V, IL= 100uA
VOUT= 0
-- 50 150 ppm/
-- 20 100 oC
-- 0.04 0.2 %
-- 0.1 0.3 %
50 80 mV
--
380 450 mV
75 120 uA
--
8 12 mA
--
110 170
uA
-- 160 250 mA
-- 0.05 0.2 %W
Output Noise, 10Hz to 100KHz
CL= 1uF
CL= 200uF
CL= 3.3uF
-- 430 --
uV/
-- 160 --
rms
-- 100 --
Note 1: Output voltage temperature coefficients defined as the worst case voltage change divided by the total
temperature range.
Note 2: Unless otherwise specified all limits guaranteed for Tj= 25oC, Vin= 6V, IL= 100uA and CL= 100uF.
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 covered under the specification for thermal regulation.
Note 4: 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 value of programmed output voltage, the minimum
input supply voltage of 2V (2.3V over temperature) must be taken in to account.
2/10 Version: E11



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TS2950/A
150mA Ultra Low Dropout Voltage Regulator
Application Hints
External Capacitors
For the stability of the TS2950/A is requires a 1.0uF(0.22uF 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
works fine; could use the film type work but are not cost efficient. For the operation of below -25 oC solid tantalum is
recommended since the many aluminum type have electrolytes the freeze at about -30 oC. The ESR of about 5or
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 0.33uF and 0.1uF for
1mA.
The TS2950/A 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.
If at the input of TS2950/A 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. This could cause more
problems when using higher value of external to set the output voltage. To fix this problem increasing output
capacitance to 3.3uF.
Reducing Output Noise
It could be an advantage to reduce the AC noise present at the output. One method 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
TS2950/A, but is relatively inefficient, as increasing capacitor from 1uF to 220uF only decreases the noise from
430uV to 160uVrms for a 100KHz bandwidth at 5V output.
the output capacitor must be increased to 3.3uF to maintain stability. These change the output noise from
430uV/rms for a 100 kHz bandwidth 5V, 3.3V & 3V output.
Block Diagram and Typical Applications Circuit
3/10 Version: E11



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TS2950/A
150mA Ultra Low Dropout Voltage Regulator
Electrical Characteristics Curve (Ta = 25oC, unless otherwise noted)
Figure 1. Line Regulation vs. Input Voltage Figure 2. Load Regulation vs. Output Current
Figure 3. Ground Pin Current vs. Output Current Figure 4. Ground Pin Current vs. Input Voltage
Figure 5. Dropout Voltage vs. Output Current
Figure 6. Load Transient Response
4/10 Version: E11




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