TS2937CP12 Taiwan Semiconductor, TS2937CP12 Datasheet - Page 4
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TS2937CP12
Manufacturer Part Number
TS2937CP12
Description
Low Dropout (LDO) Regulators 1.2 Volt 0.5 Amp 0.6V Dropout Voltage
Manufacturer
Taiwan Semiconductor
Datasheet
1.TS2937CP12.pdf
(10 pages)
Specifications of TS2937CP12
Number Of Outputs
1
Polarity
Positive
Input Voltage Max
26 V
Output Voltage
12 V
Output Type
Fixed
Dropout Voltage (max)
0.3 V at 100 mA
Output Current
500 mA
Line Regulation
0.5 %
Load Regulation
1 %
Voltage Regulation Accuracy
2 %
Maximum Operating Temperature
+ 125 C
Mounting Style
SMD/SMT
Package / Case
TO-252
Minimum Operating Temperature
- 40 C
Lead Free Status / Rohs Status
Lead free / RoHS Compliant
Other names
RO
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
calculated.
The below formula shows the voltages and currents for calculating the P
IIN = IL / IG
P
Ex. P
Remark: I
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
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:
IMPORTANT: if the maximum allowable value for is found to be ≥6
TO-263 package, ≥150
since the package alone will dissipate enough heat to satisfy these requirements. If the calculated value for θja falls
below these limits, a heatsink is required.
θja = TR(max) / PD
D
= (V
D
= 400mW + 36mW
= 436mW
= (3.3V-2.5V) * 0.5A + 3.3V * 11mA
IN
-V
I
V
V
G
L
IN
OUT
OUT
is output load current,
is ground current.
is input voltage
) * I
is output voltage
L
+ (V
o
IN
C/W for the TO-252 package, or ≥170
) * I
G
500mA Ultra Low Dropout Voltage Regulator
4/10
o
C /W for the SOT-223 package, no heatsink is needed
o
C /W for the TO-220 package, ≥80
D
in the regulator:
o
C for commercial grade parts. T
TS2937
Version: B07
o
C/W for the
D
must be
A
(max)