TC1264-3.0VDB Microchip Technology, TC1264-3.0VDB Datasheet - Page 7

• Manufacturer Part Number: TC1264-3.0VDB
• Description: IC CMOS LDO 3.0V 800MA SOT223-3
• Manufacturer: Microchip Technology

Specifications of TC1264-3.0VDB

• Regulator Topology: Positive Fixed
• Voltage - Output: 3V
• Voltage - Input: Up to 6V
• Voltage - Dropout (typical): 1.2V @ 800mA
• Number Of Regulators: 1
• Current - Output: 800mA (Min)
• Operating Temperature: -40°C ~ 125°C
• Mounting Type: Surface Mount
• Package / Case: SOT-223 (3 leads + Tab), SC-73, TO-261
• Primary Input Voltage: 4.5V
• Output Voltage: 3V
• Dropout Voltage Vdo: 450mV
• No. Of Pins: 3
• Output Current: 800mA
• Voltage Regulator Case Style: SOT-223
• Operating Temperature Range: -40°C To +125°C
• Output Voltage Fixed: 3V
• Rohs Compliant: Yes
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Current - Limit (min): -
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant, Lead free / RoHS Compliant

5.0
5.1
Integrated thermal protection circuitry shuts the
regulator off when die temperature exceeds 160°C.
The regulator remains off until the die temperature
drops to approximately 150°C.
5.2
The amount of power the regulator dissipates is
primarily a function of input and output voltage, and
output current. The following equation is used to
calculate worst-case actual power dissipation:
EQUATION 5-1:
The
(Equation
temperature (T
temperature (T
junction-to-air (
EQUATION 5-2:
Table 5-1
the TC1264 packages.
TABLE 5-1:
 2010 Microchip Technology Inc.
* Tab of device attached to topside copper
2500 sq mm 2500 sq mm 2500 sq mm
1000 sq mm 2500 sq mm 2500 sq mm
1000 sq mm 1000 sq mm 1000 sq mm
1000 sq mm
225 sq mm
100 sq mm
(Topside)*
I
Copper
LOADMAX
V
Where:
Area
V
OUTMIN
INMAX
maximum
Where all terms are previously defined.
THERMAL CONSIDERATIONS
Thermal Shutdown
Power Dissipation
P
and
P
5-2) is a function of the maximum ambient
D
D
=
= Worst-case actual power dissipation
= Maximum voltage on V
= Minimum regulator output voltage
= Maximum output (load) current
Table 5-2
2500 sq mm 2500 sq mm
2500 sq mm 2500 sq mm
(Backside)
J

P
A
MAX
JA
V
0 sq mm
Copper
MAX
D
INMAX
THERMAL RESISTANCE
GUIDELINES FOR TC1264 IN
SOT-223 PACKAGE
Area
).
MAX
) and the thermal resistance from
), the maximum allowable die
allowable
= (T
–
show various values of 
V
J
MAX
OUTMIN
1000 sq mm

JA
– T
Board
Area
power
A
I
MAX
LOADMAX
)
IN
Resistance
Thermal
dissipation
45°C/W
45°C/W
53°C/W
59°C/W
52°C/W
55°C/W

JA
JA
)
for
TABLE 5-2:
Equation 5-1
Equation 5-2
within limits. For example:
Find:
1.
2.
Actual power dissipation:
Maximum allowable power dissipation:
In this example, the TC1264 dissipates a maximum of
260 mW, which is below the allowable limit of 508 mW.
In a similar manner,
be used to calculate maximum current and/or input
voltage limits. For example, the maximum allowable
V
power dissipation of 508 mW into
which V
* Tab of device attached to topside copper
Given:
2500 sq mm 2500 sq mm 2500 sq mm
1000 sq mm 2500 sq mm 2500 sq mm
IN
125 sq mm
(Topside)*
Copper
, is found by substituting the maximum allowable
Area
Actual power dissipation.
Maximum allowable dissipation.
I
LOADMAX
V
P
P
V
IN
OUTMIN
P
T
T
D
D
INMAX
D
MAX
AMAX
JMAX

=
=

JA

= 4.6V.
to ensure regulator thermal operation is
260 mW

V
P
P
P
2500 sq mm 2500 sq mm
3.3 1.1
can be used in conjunction with
(Backside)
INMAX
DMAX
DMAX
DMAX
Copper
= 3.3V ± 10%
= 2.7V ± 0.5%
= 275 mA
= 125°C
= 95°C
= 59°C/W (SOT-223)
THERMAL RESISTANCE
GUIDELINES FOR TC1264 IN
3-PIN DDPAK/TO-220
PACKAGE

Area
Equation 5-1
–
=
=
=

V
–
508 mW
T
-------------------------------------- -

-------------------------
OUTMIN
125 95

JMAX
2.7 .995
59
–


Board
–
JA
Area
I
T
and

LOADMAX
AMAX
TC1264
Equation

275 10
Equation 5-2
DS21375D-page 7

Resistance
Thermal
25°C/W
27°C/W
35°C/W
5-1, from
3 –

JA
)
can