TC1300R-2.85VUATR Microchip Technology, TC1300R-2.85VUATR Datasheet - Page 9

• Manufacturer Part Number: TC1300R-2.85VUATR
• Description: IC REG LDO 2.85V 300MA SD 8MSOP
• Manufacturer: Microchip Technology

Specifications of TC1300R-2.85VUATR

• Regulator Topology: Positive Fixed
• Voltage - Output: 2.85V
• Voltage - Input: Up to 6V
• Voltage - Dropout (typical): 0.21V @ 300mA
• Number Of Regulators: 1
• Current - Output: 300mA (Min)
• Operating Temperature: -40°C ~ 125°C
• Mounting Type: Surface Mount
• Package / Case: 8-MSOP, Micro8™, 8-uMAX, 8-uSOP,
• Number Of Outputs: 1
• Polarity: Positive
• Input Voltage Max: 6 V
• Output Voltage: 2.85 V
• Output Type: Fixed
• Dropout Voltage (max): 0.03 V at 100 uA
• Output Current: 300 mA
• Line Regulation: 0.02 %
• Load Regulation: 0.5 %
• Voltage Regulation Accuracy: 0.5 %
• Maximum Operating Temperature: + 125 C
• Mounting Style: SMD/SMT
• Minimum Operating Temperature: - 40 C
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Current - Limit (min): -
• Lead Free Status / Rohs Status: Lead free / RoHS Compliant
• Other names: TC1300R2.85VUATR

4.0
4.1
Integrated thermal protection circuitry shuts the regula-
tor off when the die temperature exceeds 150°C. The
regulator remains off until the die temperature drops to
approximately 140°C.
4.2
The amount of power the regulator dissipates is prima-
rily a function of input and output voltage, and output
current. The following equation is used to calculate
worst case actual power dissipation:
EQUATION
The maximum allowable power dissipation, P
function of the maximum ambient temperature (T
the maximum recommended die temperature (125°C)
and the thermal resistance from junction-to-air (
The MSOP-8 package has a
200°C/Watt when mounted on a FR4 dielectric copper
clad PC board.
EQUATION
Where:
2002 Microchip Technology Inc.
P
V
V
I
LOADMAX
D
INMAX
OUTMIN
THERMAL CONSIDERATIONS
Thermal Shutdown
Power Dissipation
= worst case actual power dissipation
P
D
= maximum voltage on V
P
= minimum regulator output voltage
DMAX
V
= maximum output (load) current
INMAX
=
–
------------------------------------------- -
T
V
JMAX
OUTMIN
–
JA
T
JA
AMAX
I
LO ADMAX
of approximately
IN
DMAX
AMAX
, is a
JA
),
).
The worst case actual power dissipation equation can
be used in conjunction with the LDO maximum allow-
able power dissipation equation to ensure regulator
thermal operation is within limits. For example:
Find:
EQUATION:
EQUATION:
In this example, the TC1300 dissipates a maximum of
only 220 mW; below the allowable limit of 350 mW. In a
similar manner, the maximum actual power dissipation
equation and the maximum allowable power dissipa-
tion equation can be used to calculate maximum cur-
rent and/or input voltage limits. For example, the
maximum allowable V
maximum allowable power dissipation of 350 mW into
the actual power dissipation equation, from which
V
4.3
The primary path of heat conduction out of the package
is via the package leads. Therefore, layouts having a
ground plane, wide traces at the pads and wide power
supply bus lines combine to lower
increase the maximum allowable power dissipation
limit.
Given:
IN MAX
= 4.97V.
Layout Considerations
P
=
=
V
V
I
T
T
D
LOADMAX
AMAX
JA
220 mW
JMAX
INMAX
OUTMIN
4.1
P
DMAX
V
INMAX
–
3.0
=
=
=
=
=
=
=
=
=
ACTUAL POWER
DISSIPATION
MAXIMUM ALLOWABLE
POWER DISSIPATION
IN
–
------------------------------------------- -
-------------------------
350 mW
T
125 55
V
.975
is found by substituting the
4.1V
3.0V -2.5%
200 mA
125°C
55°C
200°C/W
JMAX
OUTMIN
200
–
–
200
JA
T
AMAX
TC1300
I
LO ADMAX
JA
10
DS21385C-page 9
and, therefore,
–
3