TS5205
Taiwan Semiconductor
150mA Low Noise LDO Voltage Regulator
with Enable Function
GENERAL DESCRIPTION
TS5205 is an efficient linear voltage regulator with ultra-
low noise output, very low dropout voltage (typically
17mV at light loads and 165mV at 150mA), and very low
power consumption (600µA at 100mA), providing high
output current even when the application requires very
low dropout voltage. The Chip Enable (EN) includes a
CMOS or TTL compatible input allows the output to be
turned off to prolong battery life. When shutdown, power
consumption drops nearly to zero. TS5205 is included a
precision voltage reference, error correction circuit, a
current
limited
output
driver,
over
temperature
shutdown, revered battery protection and a reference
bypass pin to improve its already excellent low-noise
performance.
FEATURES
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Ultra Low Noise Output
Output Current up to 150mA
Low Dropout Voltage
Low Power Consumption
“Zero” Off-mode Current
Logic Controlled Electronic Enable
Internal Current Limit
Thermal Shutdown Protection
APPLICATION
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Cellular Telephones
Palmtops, Notebook Computers
Battery Powered Equipment
Consumer and Personal Electronics
SMPS Post Regulator and DC to DC Modules
High-efficiency Linear Power Supplies
Portable Application
SOT-25
Pin Definition:
1. Input
2. Ground
3. Enable
4. Bypass / Adjust
5. Output
Notes:
Moisture sensitivity level: level 3. Per J-STD-020
TYPICAL APPLICATION CIRCUIT
TS5205CX5xx Fixed Output Version
TS5205CX5 Adjustable Output Version
Adjustable Version: V
OUT
= 1.24 (1+R2/R1)
(Adjustable output range up to 8V)
EN (pin3) may be connected directly to V
IN
(pin 1) Low noise operation: C
BYP
=470pF, C
OUT
>2.2uF
Basic operation: C
BYP
=not used, C
OUT
>2.2uF
Document Number: DS_P0000197
1
Version: I15
TS5205
Taiwan Semiconductor
ABSOLUTE MAXIMUM RATINGS
(T
A
= 25°C unless otherwise noted) (Note 1)
PARAMETER
Input Supply Voltage
Enable Input Voltage
Power Dissipation (Note 2)
Operating Junction Temperature Range
Storage Temperature Range
Lead Soldering Temperature (260 C)
o
SYMBOL
V
IN
V
CE
P
D
T
J
T
STG
LIMIT
-20~ +20
-20~ +20
Internal limited
-40 ~ +125
-65 ~ +150
5
UNIT
V
V
o
o
C
C
S
THERMAL PERFORMANCE
PARAMETER
Junction to Ambient Thermal Resistance
SYMBOL
R
ӨJA
Limit
220
UNIT
°C/W
RECOMMEND OPERATING RATING
(Note 2)
PARAMETER
Input Supply Voltage
Enable Input Voltage
SYMBOL
V
IN
V
CE
LIMIT
+2.5 ~ +16
0 ~ V
IN
UNIT
V
V
ELECTRICAL SPECIFICATIONS
(V
IN
=Vo+1V, Io=100µA, C
OUT
=1µF, Vce≥2V,T
J
= 25°C unless otherwise noted)
PARAMETER
Output Voltage
Output Voltage Temp. Coefficient
Line Regulation
Load Regulation
(Note 5)
CONDITIONS
V
IN
=Vo + 1V
(Note 4)
Vo+1V
≤
V
IN
≤
16V
0.1mA
≤
Io
≤
150mA
Io=100uA
Io=50mA
Io=100mA
Io=150mA
Io=100uA
Io=50mA
Io=100mA
Io=150mA
V
EN
≤0.4V
(Shutdown)
V
EN
≤0.18V
(Shutdown)
V
OUT
=0V
At f=100Hz, Io=100µA,
Io=50mA, C
OUT
=2.2µF,
MIN
0.99|Vo|
--
--
--
--
--
--
--
--
--
--
--
--
--
--
--
--
--
TYP
V
OUT
40
0.005
0.02
17
110
140
165
80
350
600
1300
0.01
--
300
75
0.05
260
MAX
1.01|Vo|
--
0.05
0.2
50
150
250
275
125
600
1000
1900
1
5
500
--
--
--
UNIT
V
ppm/ C
%
%
o
Dropout Voltage
(Note 6)
mV
Ground Pin Current
(Note 7)
µA
Quiescent Current
Output Current Limit
Power Supply Rejection Ratio
Thermal Regulation
Output Noise
(Note 8)
µA
mA
dB
%/W
nV√Hz
Document Number: DS_P0000197
2
Version: I15
TS5205
Taiwan Semiconductor
ELECTRICAL SPECIFICATIONS
(V
IN
=Vo+1V, Io=100µA, COUT=1µF, Vce≥2V,TA = 25°C unless otherwise noted)
PARAMETER
Enable Function
Enable Input Logic-Low Voltage
Enable Input Logic-Low Voltage
Enable input Current
Regulation shutdown
Regulation enable
V
IL
≤
0.4V
V
IH
≥
2.0V
--
2.0
--
--
--
--
0.01
5
0.4
--
-1
20
V
V
µA
V
CONDITIONS
MIN
TYP
MAX
UNIT
Note:
1. Exceeding the absolute maximum rating may damage the device.
2. The maximum allowable power dissipation at any T
A
is P
D(MAX)
= [T
J(MAX)
- Ta] + R
θJA
. Exceeding the maximum allowable
power dissipation will result in excessive die temperature, and the regulator will go into thermal shutdown.
3. The device is not guaranteed to function outside its operating rating.
4. Output voltage temperature coefficient is defined as the worst case voltage change divided by the total temperature range.
5. Regulation is measured at constant junction temperature using low duty cycle pulse testing. Parts are tested for load
regulation in the load range from 1mA to 150mA (5V version) and 1mA to 120mA (V
OUT
<5V version). Changes in output
voltage due to heating effects are covered by the thermal regulation specification.
6. Dropout voltage is defined as the input to output differential at which the output voltage drops 2% below its nominal value
measured at 1V differential.
7. Ground pin current is the regulator quiescent current plus pass transistor base current. The total current drawn from the
supply is the sum of the load current plus the ground pin current.
8. Thermal regulation is defined as the change in output voltage at a time “t” after a change in power dissipation is applied,
excluding load or line regulation effects. Specifications are for a 150mA load pulse at V
IN
=16V for t=10ms.
Document Number: DS_P0000197
3
Version: I15
TS5205
Taiwan Semiconductor
ORDERING INFORMATION
OUTPUT VOLTAGE
2.5V
3.3V
5.0V
PART NO.
TS5205CX525 RFG
TS5205CX533 RFG
TS5205CX550 RFG
PACKAGE
SOT-25
SOT-25
SOT-25
PACKING
3,000pcs / 7” Reel
3,000pcs / 7” Reel
3,000pcs / 7” 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.
BLOCK DIAGRAMS
APPLICATION INFORMATION
Enable Input
TS5205 series feature an active-high (>2V) enable (EN) input that allows ON/OFF control of the regulator.
Current drain reduces to “zero” when the device is shutdown, with only micro-amperes of leakage current. The
EN is compatible with CMOS logic interfacing. EN may be directly tied to V
IN
and pulled up to the maximum
supply voltage.
Input Capacitor Requirement
An input capacitor of 0.1µF or greater is recommended when the device is more than 10” away from the bulk AC
supply capacitance or when the supply is a battery.
Output Capacitor Requirement
The TS5205 series requires an output capacitor to maintain stability and improve transient response is necessary.
2.2µF minimum is recommended. Larger values improve the regulator’s transient response. The output capacitor
value may be increased without limit. The output capacitor should have an ESR (effective series resistance) less
than 5Ω and a resonant frequency above 1MHz. Ultra low ESR capacitors can cause a low amplitude oscillation
on the output and/or under damped transient response. Most of tantalum or aluminum electrolytic capacitors are
adequate; film types will work. Since many aluminum electrolytic have electrolytes that freeze at about –30°C,
solid tantalums are recommended for operation below –25 C. At lower values of output current, less output
capacitance is required for output stability. The capacitor can be reduced to 0.47µF for current below 10mA or
0.33µF for currents below 1mA
.
o
No Load Stability
The TS5205 series will remain stable and in regulation with no load, unlike many other voltage regulators. This is
especially important in CMOS RAM keep alive applications.
Document Number: DS_P0000197
4
Version: I15
TS5205
Taiwan Semiconductor
APPLICATION INFORMATION (CONTINUE)
Reference Bypass Capacitor
Bypass is connected to the internal voltage reference. A 470pF capacitor (C
BYPASS
) connected from Bypass to
Ground quiets this reference, providing a significant reduction in output noise. C
BYPASS
reduces the regulator
phase margin; when using C
BYPASS
, output capacitors of 2.2µF or greater are generally required to maintain
stability. The star up speed of the TS5205 is inversely proportional to the size of the reference bypass capacitor.
Applications requiring a slow ramp up of output voltage should consider larger values of C
BYPASS
. Likewise, if
rapid turn on is necessary, consider omitting C
BYPASS
. If output noise is not a major concern, omitted C
BYPASS
and
leave Bypass open.
Adjustable Regulator Design
The adjustable regulator versions can be adjusted to a specific output voltage by using two external resistors to
programming the output voltage anywhere between 1.25V and the 8V maximum operating rating of the family.
Two resistors are used. Resistors can be quite large up to 470kΩ, because of the very high input impedance and
low bias current of the sense comparator, the resistor values are calculated by:
A capacitor from Adjust to Ground provides greatly improved noise performance.
TS5205CX5
V
IN
R1
EN
on
off
C
BYP
470pF
R2
Adjustable Version: V
OUT
= 1.24 (1+R2/R1)
(Adjustable output range up to 8V)
C
OUT
2.2µF
V
OUT
Dual Supply Operation
When used in dual supply systems where the regulator load is returned to a negative supply, the output voltage
must be diode clamped to ground.
Thermal Characteristics
TS5205 series is designed to provide 150mA (5V version) of continuous current in a very small package.
Maximum power dissipation can be calculated based on the output current and the voltage drop across the part.
To determine the maximum power dissipation of the package, use the junction-ambient thermal resistance of the
device and the following basic equation:
P
D(MAX)
= [ T
J(MAX)
– T
A
] /Θ
JA
o
T
J(MAX)
is the maximum junction temperature of the die(125 C), and Ta is the ambient operating temperature.
Θ
JA
is layout dependent, the actual power dissipation of the regulator circuit can be determined using the equation:
P
D
= (V
IN
– V
OUT
) * I
OUT
+ V
IN
* I
GND
Substituting P
D(MAX)
for P
D
and solving for the operating conditions that are critical to the application will give the
maximum operating conditions for the regulator circuit. For example, when operating the TS5205CX33 at room
temperature with a minimum footprint layout, the maximum input voltage for a set output current can be
determined as follows:
P
D(MAX)
= (125 C – 25 C) / 220 C/W
P
D(MAX)
= 455mW
o
o
o
Document Number: DS_P0000197
5
Version: I15
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