TS39150
1.5A Ultra Low Dropout Fixed Positive Voltage Regulator
TO-263
Pin assignment:
1. Input
2. Ground
3.
Output
Low Dropout Voltage 0.4V (typ.)
General Description
The TS39150 series are using process with a PNP pass element for high current, high accuracy and low dropout voltage
regulators. These regulator s feature 400mV(typ) dropout voltages and very low ground current, these devices also find
applications in lower current and low dropout critical systems, where their tiny dropout voltage and ground current values
are important attributes.
The TS39150 are fully protected against over current faults, reversed input polarity, reversed lead insertion, over
temperature operation, and positive and negative transient voltage spikes.
This series is offered in 3-pin TO-263, TO-220 package.
Features
Dropout voltage typically 0.4V @Io=1.5A
Output current up to 1.5A
Low ground current
Output voltage trimmed before assembly
Extremely fast transient response
+20V Transient peak voltage
-20V Reverse peak voltage
Internal current limit
Thermal shutdown protection
Block Diagram
Applications
Battery power equipment
Automotive electronics
High efficiency “Green” computer system
High efficiency linear power supplies
High efficiency post regulator for switching
supply
Ordering Information
Part No.
TS39150CZxx
TS39150CMxx
Operation Temp.
(Junction)
-40 ~ +125
o
C
Package
TO-220
TO-263
Note: Where
xx
denotes voltage option, available are 12V, 5.0V,
3.3V and 2.5V. Contact factory for additional voltage
options.
Absolute Maximum Rating
(Note 1)
Input Supply Voltage (Note 2)
Operation Input Voltage
Power Dissipation (Note 3)
Operating Junction Temperature Range
Storage Temperature Range
Lead Soldering Temperature (260
o
C)
Vin
Vin (operate)
P
D
T
J
T
STG
-20V ~ +20
20
Internally Limited
-40 ~ +125
-65 ~ +150
5
V
V
W
o
o
C
C
S
TS39150
1-5
2005/3 rev. A
Electrical Characteristics
Vin = Vout + 1V, I
L
= 10mA, C
o
= 10uF, Ta = 25
o
C, unless otherwise specified.
Parameter
Output Voltage
Output Voltage
Conditions
10mA
≤
I
L
≤
1.5A,
Vo+1V
≤
Vin
≤
26V
Min
0.990|Vo|
0.980|Vo|
Typ
12 / 5.0
3.3/ 2.5
Max
1.010|Vo|
1.020|Vo|
Unit
V
V
V
o
ppm/ C
Input Supply Voltage
Output Voltage Temperature
Coefficient
Line Regulation
Load Regulation
Dropout Voltage (Note 4)
Vo+1V
≤
Vin
≤
26V
10mA
≤
I
L
≤
1.5A
I
L
=100mA
I
L
=750mA
I
L
=1.5A
Quiescent Current (Note 5)
I
L
=100uA
I
L
=750mA
I
L
=1.5A
Short Circuit Current (Note 6)
Output Noise,
10Hz to 100KHz, I
L
=100mA
Vout=0
C
L
=2.2uF
C
L
=10uF
C
L
=33uF
--
--
--
--
--
--
--
--
--
--
--
--
--
--
--
40
0.05
0.2
80
350
400
100
8
22
2.1
600
400
260
20
100
0.5
1.0
200
500
600
--
--
--
3.5
--
--
--
%
%
mV
mA
A
uVrms
Thermal Performance
Condition
Thermal Resistance
Junction to Ambient
Package type
TO-220
TO-263
Typ
60
80
Unit
o
C/W
Note 1: Absolute Maximum Rating is limits beyond which damage to the device may occur. For guaranteed
Specifications and test conditions see the Electrical Characteristics.
Note 2: Maximum positive supply voltage of 20V must be limited duration (<100mS) and duty cycle (<1%).
Note 3: The maximum allowable power dissipation is a function of the maximum junction temperature, Tj, the junction to
ambient thermal resistance,
θja
, and the ambient temperature , Ta. Exceeding the maximum allowable power
dissipation will cause excessive die temperature, and the regulator will go into thermal shutdown. The effective
value of
θja
can be reduced by using a heatsink.
Note 4: 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.
Note 5: Ground pin current is the regulator quiescent current. The total current drawn from the source is the sum of the
ground pin current and output load current.
Note 6: Output current will decrease with increasing temperature, but it will be not dropped below 1.5A at the maximum
specified temperature.
TS39150
2-5
2005/3 rev. A
Application Information
Application Information
The TS39150 series are high performance with low
dropout voltage regulator suitable for moderate to high
current and voltage regulator application. Its
400mA(typ) dropout voltage at full load and over
temperature makes it especially valuable in battery
power systems and as high efficiency noise filters in
post regulator applications. Unlike normal NPN
transistor design, where the base to emitter voltage
drop and collector to emitter saturation voltage limit the
minimum dropout voltage, dropout performance of the
PNP output of these devices is limited only by low Vce
saturation voltage.
The TS39150 series is fully protected from damage due
to fault conditions. Linear current limiting is provided.
Output current during overload conditions is constant.
Thermal shutdown the device when the die temperature
exceeds the maximum safe operating temperature.
Transient protection allows device survival even when
the input voltage spikes above and below nominal. The
output structure of these regulators allows voltages in
excess of the desired output voltage to be applied
without reverse current flow.
Minimum Load Current
The TS39150 series is specified between finite loads.
If the output current is too small leakage currents
dominate and the output voltage rises. A 10mA
minimum load current swamps any expected leakage
current across the operating temperature range.
Thermal Characteristics
TS39150 series linear regulators are simple to use, the
most complicated design parameters to consider are
thermal characteristics, thermal design requires the
following application specification parameters:
Maximum ambient temperature, Ta
Output current, Iout
Output voltage, Vout
Input voltage, Vin
We calculate the power dissipation of the regulator
from these numbers and the device parameters from
this data sheet. A heatsink may be required depending
on the maximum power dissipation and maximum
ambient temperature of the application. Under all
possible operating conditions, the junction temperature
must be within the range specified under absolute
maximum ratings. To determine if the heatsink is
required, the power dissipated by the regulator, P
D
must be calculated.
The below formula shows the voltages and currents for
calculating the P
D
in the regulator:
Iin = I
L
/ I
G
P
D
= (Vin-Vout) * I
L
+ (Vin) * I
G
Ex. P
D
= (3.3V-2.5V) * 1.5A + 3.3V * 11mA
= 1200mW + 36mW
= 1236mW
Remark: I
L
is output load current,
I
G
is ground current.
Vin is input voltage
Vout is output voltage
The next parameter which must be calculated is the
maximum allowable temperature rise, T
R
(max). this is
calculated by the using to formula:
T
R
(max) = T
J
(max) – T
A
(max)
Where: T
J
(max) is the maximum allowable junction
o
temperature, which is 125 C for commercial
grade parts.
is
the
maximum
ambient
T
A
(max)
temperature which will be encountered in the
application.
Typical Application Circuit
Capacitor Requirement
The TS39150 series requires an output capacitor to
maintain stability and improve transient response is
necessary. The value of this capacitor is dependent
upon the output current, lower currents allow smaller
capacitors. TS39150 series regulators are stable with
the 10uF minimum capacitor value at full load. Where
the regulator is powered from a source with high AC
impedance, a 0.1uF capacitor connected between input
and ground is recommended. The capacitor should
have good characteristics to above 250KHz. The
capacitance values will be improved transient response,
ripple rejection and output noise.
TS39150
3-5
2005/3 rev. A
京公网安备 11010802033920号
EEWORLD
