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TS2940CW33 RPG

P1-P3P4-P6P7-P9P10-P10
TS2940
Taiwan Semiconductor
Document Number: DS_P0000211 4 Version: D15
BLOCK DIAGRAM
APPLICATION INFORMATION
The TS2940 series is a high performance with low dropout voltage regulator suitable for moderate to high current
and voltage regulator application. Its 600mA (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 TS2940 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.
Output Capacitor
The TS2940 series requires an output capacitor to maintain stability and improve transient response. Proper
capacitor selection is important to ensure proper operation. The output capacitor selection is dependent upon the
ESR of the output capacitor the maintain stability. When the output capacitor is 22µF or greater, the output
capacitor should have an ESR less than 2 ohm. This will improve transient response as well as promoted stability.
Ultra low ESR capacitors (<100mohm), such as ceramic chip capacitors may promote instability. These very low
ESR levels may cause an oscillation and/or under damped transient response. A low ESR solid tantalum capacitor
works extremely well and provides good transient response and stability over temperature. Aluminum electrolytic
can also be used, as long as the ESR of the capacitor is <2ohm. The value of the output capacitor can be
increased without limit. Higher capacitance values help to improved transient response and ripple rejection and
reduce output noise.
Minimum Load Current
The TS2940 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 is necessary for proper regulation.
Input Capacitor
An input capacitor of 1µF or greater is recommended when the device is more that 4 inches away from the bulk AC
supply capacitance or when the supply is a battery. Small and surface mount ceramic chip capacitors can be used
for bypassing. Larger values will help to improve ripple rejection by bypassing the input to the regulator, further
improving the integrity of the output voltage.
TS2940
Taiwan Semiconductor
Document Number: DS_P0000211 5 Version: D15
APPLICATION INFORMATION (CONTINUE)
Thermal Characteristics
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 = IL / IG
P
D
= (V
IN
-V
OUT
) * I
L
+ (V
IN
) * I
G
Ex. P
D
= (3.3V-2.5V) * 1A + 3.3V * 11mA
= 800mW + 36mW
= 836mW
Remark: I
L
is output load current,
I
G
is ground current.
V
IN
is input voltage
V
OUT
is output voltage
The next parameter which must be calculated is the maximum allowable temperature rise.
TR(max) is calculated by the using to formula:
TR(max) = TJ(max) – TA(max)
Where: TJ(max) is the maximum allowable junction temperature, which is 125°C for commercial grade parts.
T
A
(max) is the maximum ambient temperature which will be encountered in the application.
Using the calculated values for TR(max) and PD, the maximum allowable value for the junction to ambient thermal
resistance, θja, can now be found:
R
ӨJA
= TR(max) / PD
IMPORTANT: if the maximum allowable value for is found to be ≥60°C /W for the TO-220 package, ≥80
o
C/W for
the TO-263 package, ≥150°C/W for the TO-252 package, or ≥170°C /W for the SOT-223 package, no heatsink is
needed since the package alone will dissipate enough heat to satisfy these requirements. If the calculated value for
R
ӨJA
falls below these limits, a heatsink is required.
TS2940
Taiwan Semiconductor
Document Number: DS_P0000211 6 Version: D15
PACKAGE OUTLINE DIMENSIONS
(Unit: Millimeters)
TO-220
MARKING DIAGRAM
xx
=
Voltage code (33=3.3V, 50=5V)
Y
= Year Code
M
= Month Code for Halogen Free Product
O
=Jan
P
=Feb
Q
=Mar
R
=Apr
S
=May
T
=Jun
U
=Jul
V
=Aug
W
=Sep
X
=Oct
Y
=Nov
Z
=Dec
L
= Lot Code
(1~9, A~Z)
P1-P3P4-P6P7-P9P10-P10

TS2940CW33 RPG

Mfr. #:
Buy TS2940CW33 RPG
Manufacturer:
Taiwan Semiconductor
Description:
LDO Voltage Regulators 1A Ultra LDO 3.3v Vltg Reg
Lifecycle:
New from this manufacturer.
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