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BM1084 Schematic ( PDF Datasheet ) - Bookly Microelectronic

Teilenummer BM1084
Beschreibung Voltage Regulator
Hersteller Bookly Microelectronic
Logo Bookly Microelectronic Logo 




Gesamt 9 Seiten
BM1084 Datasheet, Funktion
www.DataSheet4U.com
BM1084
GENERAL DESCRIPTION
The BM1084 series of adjustable and fixed voltage regulators are designed to provide 5A output
current and to operate down to 1V input-to-output differential. The dropout voltage of the device is
guaranteed maximum 1.5V at maximum output current, decreasing at lower load currents.
On-chip trimming adjusts the reference voltage to 1%. Current limit is also trimmed, minimizing the
stress under overload conditions on both the regulator and power source circuitry.
The BM1084 devices are pin compatible with older three-terminal regulators and are offered in 3 lead
TO-220-2 lead TO-252 package and 3 and 2 lead TO-263 (Plastic DD).
FEATURES
APPLICATIONS
Three Terminal Adjustable or Fixed Voltages*
5V, 1.8V, 2.5V, 2.85V, 3.3V and 5.0V
Output Current of 5A
Operates Down to 1V Dropout
Line Regulation: 0.2% Max.
Load Regulation: 0.4% Max.
TO-220 ,TO252and TO-263 package available
High Efficiency Linear Regulators
Post Regulators for Switching Supplies
 Microprocessor Supply
 Constant Current Regulators
 Battery Chargers
 Notebook/Personal Computer Supplies
 Portable Instrumentation
ORDERING INFORMATION
3 LEAD TO-220
BM1084
BM1084-1.5
BM1084-2.5
BM1084-2.85
BM1084-3.0
BM1084-3.3
BM1084-3.5
BM1084-5.0
PACKAGE TYPE
TO-252
BM1084
BM1084-1.5
BM1084-2.5
BM1084-2.85
BM1084-3.0
BM1084-3.3
BM1084-3.5
BM1084-5.0
PIN DESCRIPTIONS
FIXED VERSION
1- Ground
2- VOUT
3- VIN
ADJUSTABLE VERSION
1- Adjust
2- VOUT
3- VIN
2&3 LEAD TO-263
BM1084
BM1084-1.5
BM1084-2.5
BM1084-2.85
BM1084-3.0
BM1084-3.3
BM1084-3.5
BM1084-5.0
OPERATING JUNCTION
TEMPERATURE RANGE
0 to 125 C
0 to 125 C
0 to 125 C
0 to 125 C
0 to 125 C
0 to 125 C
0 to 125 C
0 to 125 C
BOOKLY MICRO ELECTRONIC LIMITED CORP.






BM1084 Datasheet, Funktion
www.DataSheet4U.com
SPECIFICATION
resistance between the regulator and the load would be:
RP x( R2+R1 )/ R1
RP = Parasitic Line Resistance
Connected as shown below,RP is not multiplied by the
divider ratio. Using 16-gauge wire the parasitic line
resistance is about 0.004 per foot, translating to 4mV/ft at
1A load current. It is important to keep the positive lead
between regulator and load as short as possible and use
large wire or PC board traces.
VIN
BM1084
IN OUT
ADJ
Rp
R1*
RL
R2*
Thermal Considerations
The BM1084 series have internal power and thermal
limiting circuitry designed to protect the device under
overload conditions. However maximum junction
temperature ratings should not be exceeded under
continuous normal load conditions. Careful consideration
must be given to all sources of thermal resistance from
junction to ambient, including junction-to-case, case-to-heat
sink interface and heat sink resistance itself. To ensure safe
operating temperatures and reflect more accurately the
device temperature, new thermal resistance specifications
have been developed. Unlike older regulators with a single
circuitry designed to protect the device under overload
BM1084
junction-to-case thermal resistance specification, the data
section for these new regulators provides a separate
thermal resistance and maximum junction temperature for
both the Control Section and the Power Transistor.
Calculations for both temperatures under certain conditions
of ambient temperature and heat sink resistance and to
ensure that both thermal limits are met.
Thermal Considerations
The BM1084 series have internal power and thermal
limiting
circuitry designed to protect the device under overload
conditions. However maximum junction temperature ratings
should not be exceeded under continuous normal load
conditions. Careful consideration must be given to all
sources of thermal resistance from junction to ambient,
including junction-to-case, case-to-heat sink interface and
heat sink resistance itself. To ensure safe operating
temperatures and reflect more accurately the device
temperature, new thermal resistance specifications
have been developed. Unlike older regulators with a single
junction-to-case thermal resistance specification, the data
section for these new regulators provides a separate
thermal resistance and maximum junction temperature for
both the Control Section and the Power Transistor.
Calculations for both temperatures under certain conditions
of ambient temperature and heat sink resistance and to
ensure that both thermal limits are met.
Junction-to-case thermal resistance is specified from the IC
junction to the bottom of the case directly below the die.
This is the lowest resistance path for the heat flow. In order
to ensure the best possible thermal flow from this area of
the package to the heat sink proper mounting is required.
Thermal compound at the case-to-heat sink interface is
recommended. A thermally conductive spacer can be used,
if the case of the device must be electrically isolated, but its
added contribution to thermal resistance has to be
considered.
BOOKLY MICRO ELECTRONIC LIMITED CORP.

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