MCP1804T-A002I/DB Microchip Technology, MCP1804T-A002I/DB Datasheet - Page 24
![IC REG LDO 10V 150MA SOT223-3](/photos/12/58/125852/mfg_mcp1825_sot223-3_sml.jpg)
MCP1804T-A002I/DB
Manufacturer Part Number
MCP1804T-A002I/DB
Description
IC REG LDO 10V 150MA SOT223-3
Manufacturer
Microchip Technology
Datasheet
1.MCP1804T-C002IOT.pdf
(38 pages)
Specifications of MCP1804T-A002I/DB
Package / Case
SOT-223 (3 leads + Tab), SC-73, TO-261
Regulator Topology
Positive Fixed
Voltage - Output
10V
Voltage - Input
Up to 28V
Voltage - Dropout (typical)
0.7V @ 100mA
Number Of Regulators
1
Current - Output
150mA (Min)
Operating Temperature
-40°C ~ 85°C
Mounting Type
Surface Mount
Input Voltage Max
28 V
Output Voltage
1.8 V
Output Voltage Tolerance
+/- 2 %
Dropout Voltage (max)
710 V
Output Current
150 mA
Line Regulation
0.05 %/V
Load Regulation
275 mV
Maximum Power Dissipation
300 mW
Maximum Operating Temperature
+ 85 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
MCP1804T-A002I/DBTR
Available stocks
Company
Part Number
Manufacturer
Quantity
Price
Part Number:
MCP1804T-A002I/DB
Manufacturer:
MICROCHIP/微芯
Quantity:
20 000
MCP1804
6.3
Internal power dissipation, junction temperature rise,
junction temperature and maximum power dissipation
are calculated in the following example. The power
dissipation, as a result of ground current, is small
enough to be neglected.
6.3.1
6.3.1.1
The internal junction temperature rise is a function of
internal power dissipation and the thermal resistance
from junction to ambient for the application. The thermal
resistance from junction to ambient (Rθ
from an EIA/JEDEC standard for measuring thermal
resistance for small surface mount packages. The EIA/
JEDEC specification is JESD51-7, “High
Thermal Conductivity Test Board for Leaded Surface
Mount Packages”. The standard describes the test
method and board specifications for measuring the
thermal resistance from junction to ambient. The actual
thermal resistance for a particular application can vary
depending on many factors, such as copper area and
thickness. Refer to AN792, “A Method to Determine
How Much Power a SOT23 Can Dissipate in an
Application” (DS00792), for more information regarding
this subject.
DS22200B-page 24
Package:
Input Voltage:
LDO Output Voltages and Currents:
Maximum Ambient Temperature:
Internal Power Dissipation:
Internal Power dissipation is the product of the LDO
output current times the voltage across the LDO
(V
IN
Package Type = SOT-23
to V
T
T
T
J(RISE)
P
JRISE
JRISE
LDO(MAX)
Voltage Regulator
OUT
T
A(MAX)
POWER DISSIPATION EXAMPLE
V
P
P
I
).
Device Junction Temperature Rise
OUT
OUT
= P
= 141.8 milli-Watts x 256.0
= 36.3
LDO
LDO
V
IN
TOTAL
= 3.8V to 4.6V
= 1.8V
= 50 mA
= +40°C
= (V
= (4.6V - (0.98 x 1.8V)) x 50 mA
= 141.8 milli-Watts
°
I
OUT(MAX)
C
IN(MAX)
x Rq
JA
- V
OUT(MIN)
JA
°
) x
C/Watt
) is derived
Effective
6.3.1.2
To estimate the internal junction temperature, the
calculated temperature rise is added to the ambient or
offset temperature. For this example, the worst-case
junction temperature is estimated below.
Maximum Package Power Dissipation at +25°C
Ambient Temperature (minimum PCB footprint)
6.4
The MCP1804 can be used not only as a regulator, but
also as a low quiescent current voltage reference. In
many microcontroller applications, the initial accuracy
of the reference can be calibrated using production test
equipment or by using a ratio measurement. When the
initial accuracy is calibrated, the thermal stability and
line regulation tolerance are the only errors introduced
by the MCP1804 LDO. The low-cost, low quiescent
current and small ceramic output capacitor are all
advantages when using the MCP1804 as a voltage
reference.
FIGURE 6-2:
Voltage Reference.
SOT-23 (256°C/Watt = Rθ
SOT-89 (180°C/Watt = Rθ
50 µA Bias
C
1 µF
IN
P
P
P
P
T
T
J
J
D(MAX)
D(MAX)
D(MAX)
D(MAX)
= T
= 76.3°C
Bridge Sensor
Voltage Reference
MCP1804
V
GND
JRISE
IN
Junction Temperature Estimate
= (85°C - 25°C) / 256°C/W
= 234 milli-Watts
= (85°C - 25°C) / 180°C/W
= 333 milli-Watts
Ratio Metric Reference
V
OUT
+ T
A(MAX)
C
1 µF
Using the MCP1804 as a
OUT
© 2009 Microchip Technology Inc.
JA
JA
):
):
V
ADO
AD1
Microcontroller
REF
PICmicro
®