IC LDO REG LOW NOISE 1.5A 5-DD

 

LT1963AEQ

Manufacturer Part NumberLT1963AEQ
DescriptionIC LDO REG LOW NOISE 1.5A 5-DD
ManufacturerLinear Technology
LT1963AEQ datasheets

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Specifications of LT1963AEQ

Regulator TopologyPositive AdjustableVoltage - Output1.21 ~ 20 V
Voltage - Input2.1 ~ 20 VVoltage - Dropout (typical)0.34V @ 1.5A
Number Of Regulators1Current - Output1.5A
Current - Limit (min)1.6AOperating Temperature-40°C ~ 125°C
Mounting TypeSurface MountPackage / CaseTO-263-5, D²Pak (5 leads + Tab), TO-263BA
Lead Free Status / RoHS StatusContains lead / RoHS non-compliant  
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APPLICATIONS INFORMATION
The following tables list thermal resistance for several
different board sizes and copper areas. All measurements
were taken in still air on 1/16" FR-4 board with one ounce
copper.
Table 3. Q Package, 5-Lead DD
COPPER AREA
TOPSIDE*
BACKSIDE
BOARD AREA
2
2
2
2500mm
2500mm
2500mm
2
2
2
1000mm
2500mm
2500mm
2
2
2
125mm
2500mm
2500mm
*Device is mounted on topside
Table 4. S0-8 Package, 8-Lead SO
COPPER AREA
TOPSIDE*
BACKSIDE
BOARD AREA
2
2
2
2500mm
2500mm
2500mm
2
2
2
1000mm
2500mm
2500mm
2
2
2
225mm
2500mm
2500mm
2
2
2
125mm
2500mm
2500mm
*Device is mounted on topside
Table 5. SOT-223 Package, 3-Lead SOT-223
COPPER AREA
TOPSIDE*
BACKSIDE
BOARD AREA
2
2
2
2500mm
2500mm
2500mm
2
2
2
1000mm
2500mm
2500mm
2
2
2
225mm
2500mm
2500mm
2
2
2
100mm
2500mm
2500mm
2
2
2
1000mm
1000mm
1000mm
2
2
2
1000mm
0mm
1000mm
*Device is mounted on topside
T Package, 5-Lead TO-220
Thermal Resistance (Junction-to-Case) = 4°C/W
Calculating Junction Temperature
Example: Given an output voltage of 3.3V, an input volt-
age range of 4V to 6V, an output current range of 0mA
to 500mA and a maximum ambient temperature of 50°C,
what will the maximum junction temperature be?
The power dissipated by the device will be equal to:
I
OUT(MAX)
where,
I
OUT(MAX)
V
IN(MAX)
THERMAL RESISTANCE
I
at (I
(JUNCTION-TO-AMBIENT)
GND
So,
23°C/W
25°C/W
P = 500mA(6V – 3.3V) + 10mA(6V) = 1.41W
33°C/W
Using a DD package, the thermal resistance will be in the
range of 23°C/W to 33°C/W depending on the copper
area. So the junction temperature rise above ambient will
be approximately equal to:
THERMAL RESISTANCE
(JUNCTION-TO-AMBIENT)
1.41W(28°C/W) = 39.5°C
55°C/W
The maximum junction temperature will then be equal to
55°C/W
the maximum junction temperature rise above ambient
63°C/W
plus the maximum ambient temperature or:
69°C/W
T
JMAX
Protection Features
THERMAL RESISTANCE
The LT1963A regulators incorporate several protection
(JUNCTION-TO-AMBIENT)
features which make them ideal for use in battery-powered
42°C/W
circuits. In addition to the normal protection features
42°C/W
associated with monolithic regulators, such as current
50°C/W
limiting and thermal limiting, the devices are protected
56°C/W
against reverse input voltages, reverse output voltages
49°C/W
and reverse voltages from output to input.
52°C/W
Current limit protection and thermal overload protection
are intended to protect the device against current overload
conditions at the output of the device. For normal opera-
tion, the junction temperature should not exceed 125°C.
The input of the device will withstand reverse voltages
of 20V. Current flow into the device will be limited to less
than 1mA (typically less than 100µA) and no negative
voltage will appear at the output. The device will protect
both itself and the load. This provides protection against
batteries that can be plugged in backward.
LT1963A Series
(V
– V
) + I
(V
IN(MAX)
OUT
GND
IN(MAX)
= 500mA
= 6V
= 500mA, V
= 6V) = 10mA
OUT
IN
= 50°C + 39.5°C = 89.5°C
)
1963afe
19

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