BM1117-3.3 [BOOKLY]
Voltage regulators;
| 型号： | BM1117-3.3 |
| 厂家： | 
Bookly Micro electronic |
| 描述： | Voltage regulators |
| 文件： | 总9页 (文件大小：532K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
BM1117A
GENERAL DESCRIPTION
The BM1117A series of adjustable and fixed voltage regulator are designed to provide0.8A
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.
The BM1117A 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 TO252-2 small plastic
package.
FEATURES
APPLICATIONS
Three Terminal Adjustable or Fixed Voltages*
High Efficiency Linear Regulators
Post Regulators for Switching Supplies
5V to 3.3V Linear Regulator
Power Management for Notebook
Battery Chargers
1.5V, 1.8V, 2.5V, 2.85V, 3.3V and 5.0V
Output Current of
0.8A
Up to +15V input max.
Line Regulation: 0.2% Max.
Load Regulation: 0.4% Max.
SOT-223 and TO-252-2 package ava
Battery Powered Instrumentation
Active SCSI Terminators
ORDERING INFORMATION
PACKAGE TYPE
OPERATING JUNCTION
TEMPERATURE RANGE
TO-252
BM1117D-ADJ
BM1117D-1.5
BM1117D-1.8
BM1117D-2.5
BM1117D-2.85
BM1117D-3.3
BM1117D--5.0
SOT-223
BM1117A-ADJ
BM1117A-1.5
BM1117A-1.8
BM1117A-2.5
BM1117A-2.85
BM1117A-3.3
BM1117A-5.0
-20 to 125° C
-20 to 125° C
-20 to 125° C
-20 to 125° C
-20 to 125° C
-20 to 125° C
-20 to 125° C
*For additional available fixed voltages contact factory.
PIN DESCRIPTIONS
FIXED
ADJUSTABLE
VERSION
1- Adjust
2- VOUT
SOT-223 Top View
TO-252-2 FRONT VIEW
VERSION
1- Ground
2- VOUT
3- VIN
3- VIN
1
2
3
BOOKLY MICRO ELECTRONIC LIMITED CORP.
A
BM1117
SPECIFICATION
ABSOLUT MAXIMUM RATINGS(Note 1)
Power Dissipation
Input Voltage
Internally limited
Soldering information
Lead Temperature (10 sec)
Thermal Resistance
TO-252 package
17V
300°C
Operating Junction Temperature
Control Section
-20°C to 125°CS
-20°C to 150°C
- 65°C to +150°C
φ JA= 60°C/W
φ JA= 90°C/W*
Power Transistor
SOT-223 package
Storage temperature
* With package soldering to copper area over
backside ground plane or internal power plane φJA
can vary from 46°C/W to >90°C/W depending on
mounting technique and the size of the copper area.
ELECTRICAL CHARACTERISTICS
Electrical Characteristics at IOUT = 0 mA, and TJ = +25°C unless otherwise specified.
Parameter
Device
Conditions
Min
Typ Max Units
I
OUT = 10 mA
Reference Voltage
(Note 2)
1.238
1.250 1.262
V
V
BM1117A
10mA ≤IOUT ≤0.8A,
1.225
1.250 1.270
1.5V≤ (VIN - VOUT) ≤12V
Output Voltage
(Note 2)
1.485
1.476
1.782
1.773
2.475
2.460
2.82
1.500 1.515
1.500 1.524
1.800 1.818
1.800 1.827
2.500 2.525
2.500 2.560
V
V
BM1117A-1.5
BM1117A-1.8
BM1117A-2.5
BM1117A-2.85
BM1117A-3.3
BM1117A-5.0
BM1117A
0≤IOUT ≤0.8A ,3.0V≤VIN ≤12V
0 ≤IOUT ≤0.8A , 3.3V≤VIN ≤12V
0 ≤IOUT≤0.8A ,4.0V≤VIN ≤12V
0 ≤IOUT ≤0.8A ,4.35V≤VIN ≤12V
0 ≤IOUT ≤0.8A ,4.75V ≤VIN ≤12V
0 ≤IOUT ≤0.8A , 6.5V ≤VIN ≤12V
V
V
V
V
2.850
2.88
V
2.79
2.850
2.91
V
3.267
3.235
4.950
4.900
3.300 3.333
3.300 3.365
5.000 5.050
5.000 5.100
V
V
V
V
0.015
0.035
0.3
0.2
0.2
5
%
I
OUT = 10 mA ,
Line Regulation
%
1.5V≤ (VIN - VOUT) ≤12V
mV
mV
mV
mV
mV
mV
mV
mV
mV
mV
mV
mV
BM1117A-1.5
BM1117A-1.8
BM1117A-2.5
BM1117A-2.85
BM1117A-3.3
BM1117A-5.0
3.0V≤VIN ≤12V
0.6
6
0.3
5
3.3V≤VIN ≤12V
4.0V≤VIN ≤12V
4.35V≤VIN ≤12V
4.75V≤VIN ≤12V
6.5V≤VIN ≤12V
0.6
6
0.3
6
0.6
6
0.3
6
0.6
6
0.5
10
10
10
10
1.0
0.5
1.0
BOOKLY MICRO ELECTRONICS LIMITED CORP.
SPECIFICATION
BM1117A
Parameter
Device
Conditions
Min
Typ Max Units
0.1
0.2
3
0.3
0.4
10
20
10
20
12
20
12
20
15
25
20
35
(VIN - VOUT) =3V,
Load Regulation
(Notes 2, 3)
BM1117A
%
10mA≤IOUT ≤0.8A
mV
mV
mV
mV
mV
mV
mV
mV
mV
mV
mV
mV
BM1117A-1.5
BM1117A-1.8
BM1117A-2.5
BM1117A-2.85
BM1117A-3.3
BM1117A-5.0
VIN=5V, 0≤IOUT ≤0.8A
6
3
VIN=5V, 0≤IOUT≤0.8A
VIN=5V, 0≤IOUT ≤0.8A
VIN=5V, 0 ≤IOUT≤0.8A
VIN=5V, 0 ≤IOUT≤0.8A
6
3
6
3
6
3
7
5
VIN=8V, 0≤IOUT ≤0.8A
∆VOUT , ∆VREF = 1%,
10
BM1117A
Dropout Voltage
/-1.5/-1.8/-2.5/-2.
85/-3.3/-5.0
1.0
1.3
V
I
OUT = 0.8A (Note 4)
(VIN - VOUT
)
BM1117A
Current Limit
/-1.5/-1.8/-2.5/-2.
85/-3.3/-5.0
900
1,100 1,500
mA
(VIN - VOUT) = 5V
Minimum
Current
Load
(VIN - VOUT
)
BM1117A
BM1117A
3
3
5
5
mA
= 12V (Note 5)
Quiescent Current /-1.5/-1.8/-2.5/-2.
85/-3.3/-5.0
mA
VIN ≤12V
f =120Hz , COUT = 22µF
Tantalum, IOUT = 0.8A, (VIN-VOUT
= 3V, CADJ =10µF
Ripple Rejection
BM1117A
60
75
dB
)
BM1117A-1.5/-1.8/
f =120Hz , COUT = 22µF
60
60
60
72
72
68
dB
dB
-2.5/- 2.85
Tantalum, IOUT = 0.8A, VIN = 6V
f =120Hz , COUT = 22µF
BM1117A-3.3
BM1117A-5.0
Tantalum, IOUT= 0.8A, VIN = 6.3V
f =120Hz , COUT = 22µF
dB
Tantalum, IOUT = 0.8A, VIN = 8V
TA = 25°C, 30ms pulse
Thermal Regulation BM1117A
Adjust Pin Current BM1117A
0.008
55
0.04
%W
µA
µA
10mA ≤IOUT ≤0.8A,
120
5
1.5V≤ (VIN - VOUT) ≤12V
10mA ≤IOUT ≤0.8A,
Adjust Pin Current
BM1117A
0.2
0.5
µA
%
Change
1.5V≤ (VIN- VOUT) ≤12V
Temperature
Stability
BOOKLY MICRO ELECTRONICS LIMITED CORP.
SPECIFICATION
BM1117
A
Parameter
Device
Conditions
Min
Typ Max Units
Long Term
0.3
1
%
%
TA =125°C, 1000Hrs
Stability
RMS Output Noise
0.003
TA=25°C, 10Hz ≤f ≤10kHz
(% of VOUT
Thermal
)
Resistance
15
°C/W
Junction-to-Case
Parameters identified with boldface type apply over the full operating temperature range.
Note 1: Absolute Maximum Ratings indicate limits beyond which damage to the device may occur. For
guaranteed specifications and test conditions, see the Electrical Characteristics. The guaranteed specifications
apply only for the test conditions listed.
Note 2: Line and Load regulation are guaranteed up to the maximum power dissipation of 1.2 W. Power
dissipation is determined by the input/output differential and the output current. Guaranteed maximum power
dissipation will not be available over the full input/output range.
Note 3: See thermal regulation specifications for changes in output voltage due to heating effects. Line and
load regulation are measured at a constant junction temperature by low duty cycle pulse testing. Load
regulation is measured at the output lead ~1/8” from the package.
Note 4: Dropout voltage is specified over the full output current range of the device.
Note 5: Minimum load current is defined as the minimum output current required to maintain regulation.
When 1.5V≤ (VIN - VOUT) ≤12V the device is guaranteed to regulate if the output current is greater than
10mA.
APPLICATION HINTS
The BM1117A series of adjustable and fixed regulators are easy to use and are protected against
short circuit and thermal overloads. Thermal protection circuitry will shut-down the regulator
should the junction temperature exceed 165°C at the sense point.
Pin compatible with older three terminal adjustable regulators, these devices offer the
advantage of a lower dropout voltage, more precise reference tolerance and improved
reference stability with temperature.
Stability
To ensure good transient response with
heavy load current changes capacitor
values on the order of 100mF are used in
the output of many regulators. To further
improve stability and transient response
of these devices larger values of output
capacitor can be used.
The circuit design used in the BM1117A
series requires the use of an output
capacitor as frequency compensation. The
addition of 22µF solid tantalum or 150uF
aluminum on the output will ensure stability
for all operating conditions.
When adjustment terminal is bypassed with
a capacitor to improve ripple rejection, the
requirement for output capacitor increase.
The value of 22µF tantalum or 150uF
aluminum covers all cases of bypassing the
adjustment terminal. Without bypassing the
adjustment terminal smaller capacitors can
be used with equally good results.
Protection Diodes
Unlike older regulators, the BM1117A
family does not need any protection
diodes between the adjustment pin and
the output and from the output to the
input to prevent over-stressing the die.
Internal resistors are limiting the internal
BOOKLY MICRO ELECTRONICS LIMITED CORP.
SPECIFICATION
BM1117A
.current paths on the BM1117A adjustment
pin, therefore even with capacitors on the
adjustment pin no protection diode is
needed to ensure device safety under
short-circuit conditions.
damage can occur. A diode from output to
input is recommended, when a crowbar
circuit at the input of the BM1117A is used
(Figure 1).
Output Voltage
Diodes between the input and output are
not usually 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
1000mF to 5000mF and the input pin is
instantaneously shorted to ground,
The BM1117A 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
BM1117A
VIN
VOUT
IN
OUT
BM1117A
VIN
VOUT
ADJ
R1
IN
OUT
VREF
ADJ
R1
R2
COUT
100uF
IADJ
50uA
R2
CADJ
10uF
VOUT = VRE F (1+ R2/R1)
47 ohm<R1<1500 ohm
Figure 1.
Figure 2. Basic Adjustable Regulator
effective resistance between the regulator
and the load would be:
Load Regulation
True remote load sensing it is not possible
to provide, because the BM1117A 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.
RP x ((R2+R1)/ R1),
RP = Parasitic Line Resistance
BM1117A
VIN
IN
OUT
Rp
ADJ
R1*
RL
R2*
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.
SPECIFICATION
BM1117A
Connected as shown above , RP is not
multiplied by the divider ratio
Experiments have shown that the heat
spreading copper layer does not need to be
electrically connected to the tab of the device.
The PC material can be very effective at
transmitting heat between the pad area,
attached to the pad of the device, and a
ground plane layer either inside or on the
opposite side of the board. Although the
actual thermal resistance of the PC material
is high, the Length/Area ratio of the thermal
resistance between layers is small. The data
in Table 1, was taken using1/16” FR-4 board
with 1 oz. copper foil, and it can be used as a
rough guideline for estimating thermal
resistance.
In the case of fixed voltage devices the top
of R1 is connected Kelvin internally, and
the ground pin can be used for negative
side sensing.
Thermal Considerations
The BM1117A series have internal power
and thermal limiting circuitry designed to
protect the device under overload
conditions. However maximum junction
temperature ratings of 125°C should not be
exceeded under continuous normal load
conditions.
Careful consideration must be given to all
sources of thermal resistance from junction
to ambient. For the surface mount package
SOT-223 additional heat sources mounted
near the device must be considered. The
heat dissipation capability of the PC board
and its copper traces is used as a heat sink
for the device. The thermal resistance from
the junction to the tab for the BM1117A is
15°C/W. Thermal resistance from tab to
ambient can be as low as 30°C/W.
For each application the thermal resistance
will be affected by thermal interactions with
other components on the board. To
determine
the
actual
value
some
experimentation will be necessary.
The power dissipation of the BM1117A is equal
to:
PD = ( VIN - VOUT )( IOUT
)
Maximum junction temperature will be equal
The total thermal resistance from junction
to ambient can be as low as 45°C/W. This
requires a reasonable sized PC board with
at least on layer of copper to spread the
heat across the board and couple it into the
surrounding air.
to:
TJ = TA(MAX) + PD
PD :Thermal esistance (junction-to-ambient)
Maximum junction temperature must not
exceed 125°C.
SOT223 Table 1.
COPPER AREA
THERMAL RESISTANCE
BOARD AREA
(JUNCTION-TO-AMBIENT)
TOP SIDE*
2500 Sq. mm
1000 Sq. mm
225 Sq. mm
100 Sq. mm
1000 Sq. mm
1000 Sq. mm
BACK SIDE
2500 Sq. mm
2500 Sq. mm
2500 Sq. mm
2500 Sq. mm
1000 Sq. mm
0
2500 Sq. mm
2500 Sq. mm
2500 Sq. mm
2500 Sq. mm
1000 Sq. mm
1000 Sq. mm
45°C/W
45°C/W
53°C/W
59°C/W
52°C/W
55°C/W
BOOKLY MICRO ELECTRONICS LIMITED CORP.
SPECIFICATION
BM1117A
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
100Ωto 200Ω) 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=100Ω at
120Hz the adjust pin capacitor should be >13mF. At 10kHz only 0.16mF 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 ).
BOOKLY MICRO ELECTRONICS LIMITED CORP.
A
BM1117
SPECIFICATION
TYPICAL CHARACTERISTICS
Minimum Operating Current
(Adjustable Device)
Short-Circuit Current
Ripple Rejection vs. Current
Adjust Pin Current
Load Regulation
Temperature Stability
BOOKLY MICRO ELECTRONICS LIMITED CORP.
A
BM1117
SPECIFICATION
ƽ TO252-2
ƽ SOT223-3
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