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TS2937CZ33 C0G

P1-P3P4-P6P7-P9P10-P10
TS2937
Taiwan Semiconductor
Document Number: DS_P0000215 4 Version: E15
BLOCK DIAGRAM
APPLICATION INFORMATION
The TS2937 series is a high performance with low dropout voltage regulator suitable for moderate to high current
and voltage regulator application. Its 600mV(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 V
CE
saturation voltage.
The TS2937 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 TS2937 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 10uF 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 TS2937 series is specified between finite loads. If the output current is too small leakage currents dominate
and the output voltage rises. A 1mA minimum load current is necessary for proper regulation.
Input Capacitor
An input capacitor of 1uF 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.
TS2937
Taiwan Semiconductor
Document Number: DS_P0000215 5 Version: E15
APPLICATION INFORMATION (CONTINUED)
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) * 0.5A + 3.3V * 11mA
= 400mW + 36mW
= 436mW
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
o
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, θ
JA
, can now be found:
θ
JA
= TR(max) / PD
IMPORTANT: if the maximum allowable value for is found to be ≥6
o
C /W for the TO-220 package, ≥80
o
C/W for the
TO-263 package, ≥150
o
C/W for the TO-252 package, or ≥170
o
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
θ
JA
falls below these limits, a heatsink is required.
TS2937
Taiwan Semiconductor
Document Number: DS_P0000215 6 Version: E15
PACKAGE OUTLINE DIMENSIONS
(Unit:
Millimeters)
TO-220
MARKING DIAGRAM
XX
=
Voltage Code ( 50=5.0V, 33=3.3V )
33
=
3.3V
50
=
5.0V
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
P1-P3P4-P6P7-P9P10-P10

TS2937CZ33 C0G

Mfr. #:
Buy TS2937CZ33 C0G
Manufacturer:
Taiwan Semiconductor
Description:
LDO Voltage Regulators 0.5Amp Ultra Low Dropout 3.3v Volt Regul
Lifecycle:
New from this manufacturer.
Delivery:
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