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What is BM1084?

This electronic component, produced by the manufacturer "Bookly Microelectronic", performs the same function as "Voltage Regulator".


BM1084 Datasheet PDF - Bookly Microelectronic

Part Number BM1084
Description Voltage Regulator
Manufacturers Bookly Microelectronic 
Logo Bookly Microelectronic Logo 


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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.

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BM1084 equivalent
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SPECIFICATION
needed. Microsecond surge currents of 50A to 100A can be
handled by the internal diode between the input and output
pins of the device. In normal operations it is difficult to get
those values of surge currents even with the use of large
output capacitances. If high value output capacitors are
used, such as 1000uF to 5000uF and the input pin is
instantaneously shorted to ground, damage can occur. A
diode from output to input is recommended, when a crowbar
circuit at the input of the BM1084 is used. Normal
power supply cycling or even plugging and unplugging in
the system will not generate current large enough to do any
damage. The adjustment pin can be driven on a transient
basis  25V, with respect to the output without any device
degradation. As with any IC regulator, none the protection
circuitry will be functional and the internal transistors will
break down if the maximum input to output voltage
differential is exceeded.
D1
VIN
BM1084
IN OUT
ADJ
VOUT
R1 COUT
150uF
CADJ
10uF
R2
BM1084
Ripple Rejection
The ripple rejection values are measured with the
adjustment pin bypassed. The impedance of the adjust pin
capacitor at the ripple frequency should be less than the
value of R1 (normally 100Ωto120) for a proper bypassing
and ripple rejection approaching the values shown. The size
of the required adjust pin capacitor is a function of the input
ripple frequency. If R1=100at 120Hz the adjust pin
capacitor should be 25uF. At 10kHz only 0.22uF is needed.
The ripple rejection will be a function of output voltage,
in circuits without an adjust pin bypass capacitor. The
output ripple will increase directly as a ratio of the output
voltage to the reference voltage (VOUT / VREF).
Output Voltage
The BM1084 series develops a 1.25V reference
voltage between the output and the adjust terminal. Placing
a resistor between these two terminals causes a constant
current to flow through R1 and down through R2 to set the
overall output voltage.
This current is normally the specified minimum load
current of 10mA. Because IADJ is very small and constant it
represents a small error and it can usually be ignored.
VIN
BM1084
IN OUT
VOUT
ADJ
VREF
R1
IADJ
50uA
R2
Overload Recovery
When the power is first turned on, as the input voltage
rises, the output follows the input, permitting the regulator to
start up into heavy loads. During the start-up, as the input
voltage is rising, the input-to-output voltage differential
remains small, allowing the regulator to supply large output
currents. A problem can occur with a heavy output load
when the input voltage is high and the output voltage is low,
when the removal of an output short will not permit the
output voltage to recover. The load line for such a load may
intersect two points on the output current curve. In this
case, there are two stable output operating points for the
regulator. With this double intersection, the power supply
may need to be cycled down to zero and brought up again
to make the output recover.
VOUT = VREF 1+ R2/R1)+IADJR2
Figure 1. Basic Adjustable Regulator
Load Regulation
True remote load sensing it is not possible to provide,
because the BM1084 is a three terminal device. The
resistance of the wire connecting the regulator to the load
will limit the load regulation. The data sheet specification for
load regulation is measured at the bottom of the package.
Negative side sensing is a true Kelvin connection, with the
bottom of the output divider returned to the negative side of
the load.
The best load regulation is obtained when the top of the
resistor divider R1 is connected directly to the case not to
the load. If R1 were connected to the load, the effective
BOOKLY MICRO ELECTRONIC LIMITED CORP.


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Part Details

On this page, you can learn information such as the schematic, equivalent, pinout, replacement, circuit, and manual for BM1084 electronic component.


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Part NumberDescriptionMFRS
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