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PDF BM1117 Data sheet ( Hoja de datos )
| Número de pieza | BM1117 | |
| Descripción | Adjustable and fixed voltage regulators | |
| Fabricantes | Bookly Microelectronic | |
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BM1117
GENERAL DESCRIPTION
The BM1117 series of adjustable and fixed voltage regulators are designed to provide 1A
output current and to operate down to 1V input-to-output differential. The dropout voltage of the
device is guaranteed maximum 1.3V at maximum output current, decreasing at lower load
currents.
On-chip trimming adjusts the reference voltage to within 1% accuray. Current limit is also
trimmed, minimizing the stress under overload conditions on both the regulator and power
source circuitry.
www.DataSheet4U.com The BM1117 devices are pin compatible with other three-terminal SCSI regulators and are
offered in the low profile surface mount SOT-223 package and in the TO-252 (DPAK) plastic
package.
FEATURES
APPLICATIONS
Three Terminal Adjustable or Fixed Voltages*
1.5V, 1.8V, 2.5V, 2.85V, 3.3V and 5.0V
Output Current of 1A
Operates Down to 1V Dropout
Line Regulation: 0.2% Max.
Load Regulation: 0.4% Max.
SOT-223 and TO-252 package available
High Efficiency Linear Regulators
Post Regulators for Switching Supplies
5V to 3.3V Linear Regulator
Power Management for Notebook
Battery Chargers
Battery Powered Instrumentation
Active SCSI Terminators
ORDERING INFORMATION
PACKAGE TYPE
OPERATING JUNCTION
TO-252
SOT-223
TEMPERATURE RANGE
BM1117-ADJ
BM1117-ADJ
0 to 125° C
BM1117-1.5
BM1117-1.5
0 to 125° C
BM1117-1.8
BM1117-1.8
0 to 125° C
BM1117-2.5
BM1117-2.5
0 to 125° C
BM1117-2.85
BM1117-2.85
0 to 125° C
BM1117-3.3
BM1117-3.3
0 to 125° C
BM1117--5.0
BM1117-5.0
0 to 125° C
*For additional available fixed voltages contact factory.
PIN DESCRIPTIONS
FIXED
VERSION
1- Ground
2- VOUT
3- VIN
ADJUSTABLE
VERSION
1- Adjust
2- VOUT
3- VIN
SOT-223 Top View
123
TO-252 FRONT VIEW
TAB IS
OUTPUT
3
2
1
BOOKLY MICRO ELECTRONIC LIMITED CORP.
1 page  
SPECIFICATION
.current paths on the BM1117 adjustment
pin, therefore even with capacitors on the
adjustment pin no protection diode is
needed to ensure device safety under
short-circuit conditions.
Diodes between the input and output are
not usually needed. Microsecond surge
currents of 50A to 100A can be handled by
www.DataSheet4U.com 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
1000mF to 5000mF and the input pin is
instantaneously shorted to ground,
BM1117
damage can occur. A diode from output to
input is recommended, when a crowbar
circuit at the input of the BM1117 is used
(Figure 1).
Output Voltage
The BM1117 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
BM1117
VIN IN OUT
VOUT
ADJ
R1 COUT
22uF
CADJ
10uF
R2
BM1117
VIN IN OUT
VOUT
ADJ VREF R1
IADJ
50uA
R2
Figure 1.
VOUT = VRE F (1+ R2/R1)+IADJR2
Figure 2. Basic Adjustable Regulator
Load Regulation
True remote load sensing it is not possible
to provide, because the BM1117 is a three
terminal device. The resistance of the wire
effective resistance between the regulator
and the load would be:
RP x ((R2+R1)/ R1),
RP = Parasitic Line Resistance
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.
BM1117
VIN IN
OUT
ADJ
Rp
R1*
RL
Negative side sensing is a true Kelvin
connection, with the bottom of the output
R2*
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
*CONNECT R1 TO CASE
*CONNECT R2 TO LOAD
Figure 3. Connections for Best
Load Regulation
BOOKLY MICRO ELECTRONICS LIMITED CORP.
5 Page | ||
| Páginas | Total 9 Páginas | |
| PDF Descargar | [ Datasheet BM1117.PDF ] | |
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