TS5205
150mA Low Noise LDO Voltage Regulator
with Enable Function
SOT-25
Pin Definition:
1. Input
2. Ground
3. Enable
4. Bypass / Adjust
5. Output
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 (600uA 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
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
Typical Application Circuit
V
IN
TS5205CX5xx
V
OUT
C
OUT
2.2uF
C
BYP
470pF
EN
off
on
Application
V
IN
TS5205CX5
R1
C
BYP
470pF
V
OUT
Ordering Information
Part No.
Package
Packing
TS5205CX5xx RF
SOT-25
3Kpcs / 7” Reel
Note: Where
xx
denotes voltage option, available are
50=5.0V
33=3.3V
30=3.0V
29=2.9V
28=2.8V
25=2.5V
Leave blank for adjustable version.
Contact factory for additional voltage options.
EN
off
on
R2
C
OUT
2.2uF
Adjustable Version: V
OUT
= 1.24 (R1+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
1/7
Version: B07
TS5205
150mA Low Noise LDO Voltage Regulator
with Enable Function
Absolute Maximum Rating
(Note 1)
Parameter
Input Supply Voltage
Enable Input Voltage
Power Dissipation (Note 2)
Thermal Resistance
Operating Junction Temperature Range
Storage Temperature Range
Lead Soldering Temperature (260
o
C)
Symbol
V
IN
V
CE
P
D
Ө
JA
T
J
T
STG
Limit
-20~ +20
-20~ +20
Internal limited
220
-40 ~ +125
-65 ~ +150
5
Unit
V
V
o
C/W
o
o
C
C
S
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 Specification
(
V
IN
=Vo+1V, Io=100uA, C
OUT
=1uF, Vce≥2V, T
J
= 25
o
C, unless otherwise specified.)
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=120mA
Io=150mA
Io=100uA
Io=50mA
Io=120mA
Io=150mA
V
IN
<0.4V (Shutdown)
V
IN
<0.18V (Shutdown)
V
OUT
=0V
At f=100Hz, Io=100uA,
Io=50mA, C
OUT
=2.2uF,
Regulation shutdown
Regulation enable
V
IL
≤
0.4V
V
IH
≥
2.0V
2/7
Min
0.99|Vo|
--
--
--
--
--
--
--
--
--
--
--
--
--
--
--
--
--
--
2.0
--
--
Typ
V
OUT
40
0.005
0.02
17
110
140
165
80
350
600
1300
0.01
--
300
75
0.05
260
--
--
0.01
5
Max
1.01|Vo|
--
0.05
0.2
50
150
250
275
125
600
1000
1900
1
5
500
--
--
--
0.4
--
-1
20
Unit
V
ppm/
o
C
%
%
Dropout Voltage (Note 6)
mV
Ground Pin Current (Note 7)
uA
Quiescent Current
Output Current Limit
Power Supply Rejection Ratio
Thermal Regulation (Note 8)
Output Noise
uA
mA
dB
%/W
nV√Hz
V
V
uA
Enable Function
Enable Input Logic-Low Voltage
Enable Input Logic-Low Voltage
Enable input Current
Version: B07
TS5205
150mA Low Noise LDO Voltage Regulator
with Enable Function
Electrical Specification (Continue)
Note:
1. Exceeding the absolute maximum rating may damage the device.
2. The maximum allowable power dissipation at any Ta is Pd(max) = [T
J(MAX)
- Ta] +
Ө
JA
. 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.
Block Diagrams
3/7
Version: B07
TS5205
150mA Low Noise LDO Voltage Regulator
with Enable Function
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 0.1uF 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.
2.2uF 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
o
C, solid
tantalums are recommended for operation below –25
o
C. At lower values of output current, less output capacitance is
required for output stability. The capacitor can be reduced to 0.47uF for current below 10mA or 0.33uF for currents
below 1mA
.
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 2.2uF 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.
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.
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 1.25 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
off
on
C
BYP
470pF
R2
Adjustable Version: V
OUT
= 1.24 (R1+R2)/R1
(Adjustable output range up to 8V)
V
OUT
C
OUT
2.2uF
4/7
Version: B07
TS5205
150mA Low Noise LDO Voltage Regulator
with Enable Function
Application Information (Continue)
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
T
J(MAX)
is the maximum junction temperature of the die(125
o
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 Pd(max) for Pd 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:
o
o
o
P
D(MAX)
= (125 C – 25 C) / 220 C/W
P
D(MAX)
= 455mW
The junction to ambient thermal resistance for the minimum footprint is 220
o
C/W, the maximum power dissipation
must not be exceeded for proper operation. Using the output voltage of 3.3V and an output current of 120mA, the
maximum input voltage can be determined. From the electrical characteristics table, the maximum ground current for
120mA output current is 2.5mA.
445mW = (V
IN
– 3.3V) * 150mA + V
IN
* 2.5mA
445mW = V
IN
* 150mA – 3.3 * 150mA + V
IN
* 2.5mA
445mW = V
IN
* 150mA – 495mW + V
IN
* 2.5mA
950mW = V
IN
* 152.5mA
V
IN
(max) = 6.23V
Therefore, a 3.3V application at 150mA of output current can accept a maximum input voltage of 6.23V in a SOT-25
package.
Fixed Output Regulator Design
V
IN
TS5205CX5xx
V
OUT
C
OUT
2.2uF
C
BYP
470pF
TS5205CX5xx
V
IN
V
OUT
C
OUT
2.2uF
EN
off
on
Ultra Low Noise Fixed Voltage Application
Includes a 470pF capacitor for low noise operation and
shows EN connected to IN for an application where
enable/shutdown is not required. C
OUT
= 2.2uF minimum.
Low Noise Fixed Voltage Application
An example of a low noise configuration where
bypass is not required. C
OUT
= 2.2uF minimum
5/7
Version: B07
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