BL1085
3A Bipolar Linear Regulator
DESCRIPTION
BL1085 is a series of low dropout three
terminal regulators with a dropout of 1.3V at
3A load current.
Other than a fixed version (Vout
＝
1.8V,2.5V,3.3V,5.0V
）
, BL1085 has an
adjustable version, The adjustable version
can set the output voltage with two external
resistors.
BL1085 offers thermal shut down and current
limit functions, to assure the stability
of chip and power system. And it uses
trimming technique to guarantee output
voltage accuracy within
±2％.
BL1085 series is available in standard
packages of TO-263-2L, TO-263-3L, TO-220
and TO-252
FEATURES
•
•
•
•
•
•
•
Other than a fixed version and an
adjustable version, output value can be
customized on command
Maximum output current is 3A
Output voltage accuracy is within
±2％
Range of operation input voltage: Max
15V
Line regulation: 0.2％ (Typical)
Load regulation: 0.2％ (Typical)
Environment Temperature: -40℃~85℃
APPLICATIONS
•
•
•
•
Power Management for Computer Mother
Board, Graphic Card
Battery Charger
Post Regulators for Switching Supplies
Microprocessor Supply
TYPICAL APPLICATION
BL1085
ELECTRICAL CHARACTERISTICS
Dropout Voltage VS. Output Current
1.350
Dropout Voltage(V)
1.300
1.250
1.200
1.150
1.100
1.050
Application circuit of BL1085 fixed version
NOTE: Input capacitor (Cin=10uF) and
Output capacitor (Cout=22uF) are
recommended in all application circuit.
Tantalum capacitor is recommended.
0
0.5
1
1.5
Iout(A)
2
2.5
3
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BL1085
ORDERING INFORMATION
BL1085
□□□
1 2 3
Code
1
□
2
□
PIN CONFIGURATION
3
□
Description
Output voltage:
e.g. 18=1.8V
33=3.3V
AD=Output adjustable
Temperature&Rohs:
C:
-40~80°C
,Pb Free Rohs Std.
Package type:
Y:TO-252
S:TO-263-2L
S1:TO-263-3L
Z:TO-220-3L
ABSOLUTE MAXIMUM RATING
Parameter
Value
Max Input Voltage
Operating Junction
Temperature(Tj)
Ambient Temperature(Ta)
Package
TO-252
Thermal
TO-263
Resistance
TO-220
Storage Temperature(Ts)
Lead Temperature & Time
15V
150°C
-40°C –80°C
6℃ / W
3℃ / W
3℃ / W
-40°C -150°C
260°C,10S
Pin Description：
：
Fixed Version
Pin No.
1
2
3
Pin No.
1
2
3
Symbol
GND
Vout
Vin
Definition
Ground
Output
Input
Adjustable Version
Symbol Definition
Adj.
Adjustable
Vout
Output
Vin
Input
Note:
Exceed these limits to damage to the device. Exposure
to absolute maximum rating conditions may affect
device reliability
.
RECOMMENDED WORK CONDITIONS
Parameter
Value
Input Voltage Range
Operating Junction
Temperature(Tj)
Max.15V
0°C –125°C
Marking information：
：
A：Means Manufacture weeks
B：Means Manufacture LOT No.
C:Means Output Voltage Value
D:Means Temp. Range&Rohs Std
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BL1085
ELECTRICAL CHARACTERISTICS
Tj=25℃
Symbol
Vref
Parameter
Reference
Voltage
Conditions
Iout=10mA, Vin-Vout=3V
10mA≤Iout≤3A ,1.5V≤Vin-Vout≤5V
BL1085-1.80V
Iout=0mA,Vin=4.8V,Tj=25℃
10mA≤Iout≤3A ,3.4V≤Vin≤7V
BL1085-2.50V
Iout=0mA,Vin=4.8V,Tj=25℃
10mA≤Iout≤3A ,4.1V≤Vin≤7V
BL1085-3.3V
Iout=0mA,Vin=6.3V,Tj=25℃
10mA
≤Iout≤3A
,4.9V≤Vin≤8V
BL1085-5.0V
Iout=0mA,Vin=8.0V,Tj=25℃
10mA
≤Iout≤3A
,6.6V≤Vin≤10V
BL1085-ADJ
Iout=10mA
2.85V≤Vin≤10V
BL1085-1.8V
Iout=10mA
3.4V≤Vin≤10V
Min
1.238
1.225
Typ
1.25
1.25
Max
1.262
1.275
Unit
V
1.782
1.764
2.475
2.45
1.80
1.80
2.50
2.50
1.818
1.836
2.525
2.55
V
V
Vout
Output
Voltage
3.267
3.234
3.3
3.3
3.333
3.366
V
4.95
4.90
5.0
5.0
5.05
5.10
V
0.035
0.2
%
10
15
mV
∆Vout
Line
Regulation
(note 1)
BL1085-2.5V
Iout=10mA
4.1V≤Vin≤10V
BL1085-3.3V
Iout=10mA
4.9V≤Vin≤10V
BL1085-5.0V
Iout=10mA
6.6V≤Vin≤10V
BL1085-ADJ
Vin-Vout=3V, 10mA≤Iout≤3A
10
15
mV
10
15
mV
10
15
mV
0.2
0.4
%
∆Vout
Load
Regulation
(note 1,2)
BL1085-1.8V
Vin-Vout=3V, 0≤Iout≤3A
3
15
mV
BL1085-2.5V
Vin-Vout=3V, 0≤Iout≤3A
3
15
mV
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BL1085
BL1085-3.3V
Vin-Vout=3V, 0≤Iout≤3A
3
15
mV
BL1085-5.0V
Vin-Vout=3V, 0≤Iout≤3A
Dropout
Voltage
(note 3)
3
15
mV
Vin-Vout
∆Vout, ∆Vref =1%，Iout=3A
1.3
1.5
V
Current Limit
Ilimit
Minimum
Load Current
(note 4)
Vin-Vout=3V, Tj=25℃
3.2
4.5
A
BL1085-ADJ
3
10
mA
Iq
Quiescent
Current
Adjust Pin
Current
(Adjustable
Version)
Vin=10V
4
10
mA
IAdj
Vin=4.25V,
Iout=10mA
45
110
uA
Ripple
Rejection
Adjust Pin
Current
Change
Temperature
Stability
Thermal
Resistance
junction to case
F=120Hz,Cout=25uF( tan),
Iout=3A,Vin-Vout=3V
60
dB
Ichange
10mA≤Iout≤3A
1.5V≤Vin-Vout
≤6V
0.2
5
uA
Iout=10mA,
Vin-Vout=1.5V
TO-252
TO-263
TO-220
6
3
3
0.5
%
θ
JC
℃
/
W
Note1:The Parameters of Line Regulation and Load Regulation in Table1 are tested under
constant junction temperature.
Note2:When Iout varies between 0~3A,Vin-Vout varies between 1.5V~6V under constant junction
temperature,the parameter is satisfied the criterion in table. If temperature varies between -40℃≤
T
A
≤85℃,it
needs output current to be larger than 10mA to satisfy the criterion.
Note3:Dropout Voltage is tested under Iout=3A and the following testing conditions: First step is
to find out the Vout value(Vout1) when Vin1=Vout+1.5V, second step is to decrease Vin(Vin2) until
Vout value is equal to 99%*Vout1(Vout2). Vdropout=Vin2-Vout2.
Note4：Minimum Load Current is defined as the minimum output current required to maintain
regulation. When 1.5V≦Vin-Vout≦6V，the device is guaranteed to regulate if the output current is
greater than 10mA.
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BL1085
BLOCK DIAGRAM
DETAILED DESCRIPTION
BL1085 is a series of low dropout voltage, three terminal regulators. Its application circuit is very
simple: the fixed version only needs two capacitors and the adjustable version only needs two
resistors and two capacitors to work. It is composed of some modules including start-up circuit,
bias circuit, bandgap, thermal shutdown, current limit, power transistors and its driver circuit and so
on.
The thermal shut down and current limit modules can assure chip and its application system
working safety when the environment temperature is larger than 140℃ or output current is larger
than 3.2A.
The bandgap module provides stable reference voltage, whose temperature coefficient is
compensated by careful design considerations. The temperature coefficient is under
100ppm/℃.And the accuracy of output voltage is guaranteed by trimming technique.
TYPICAL APPLICATION
BL1085 has an adjustable version and fixed versions, Chart1 is its typical application:
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