BELLING BL1084

BL1084
5A Bipolar Linear Regulator
DESCRIPTION
FEATURES
BL1084 is a series of low dropout three
terminal regulators with a typical dropout
voltage of 1.4V at 5A load current.




Fixed and adjustable versions.
Maximum output current : 5A
Maximum input voltage: 15V
Line regulation: 0.2％ (Typical)
Load regulation: 0.2％ (Typical)
On-Chip Thermal Shutdown
Operation environment Temperature: -10℃
~ 85℃
Other than fixed voltage versions (1.8V, 2.5V,
3.3V, 5.0V), BL1084 has an adjustable
voltage version, with which desired voltage
can be achieved by setting the values of two
external resistors of the application circuitry.


BL1084 offers thermal shut down and current
limit functions to assure the stability of chip
and power system.
APPLICATIONS


BL1084 series is available in standard
packages of TO-263-2L, TO-263-3L, TO-220
and TO-252.



TYPICAL APPLICATION
Power Management for Computer Mother
Board, Graphic Card
Battery Charger
Post Regulators for Switching Supplies
Microprocessor Supply
ELECTRICAL CHARACTERISTICS
1.5
1.4
Dropout(V)
BL1084
1.3
1.2
1.1
1
0.9
0.8
0.5
1.5
2.5
3.5
4.5
Iout(A)
Fig 1. BL1084 fixed version Application circuit
Fig 2. Dropout Voltage VS. Output Current
NOTE: Input capacitor (Cin=10uF) and Output
capacitor (Cout=22uF) are recommended in all
application circuit. Tantalum capacitor is
preferred.
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BL1084
ORDERING INFORMATION
BL1084 □
1 □
2 □
3
Code
1
□
2
□
3
□
PIN CONFIGURATION
Description
Output voltage:
e.g. 18=1.8V
33=3.3V
Default=Adjustable Version
Temperature&Rohs:
C: -40~85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
Pin Description：
Fixed Version
-40C –85C
6℃ / W
3℃ / W
Pin No.
1
2
3
3℃ / W
-40C -150C
260C,10S
Definition
Ground
Output
Input
Adjustable Version
Pin No.
1
2
3
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)
Symbol
GND
Vout
Vin
Symbol Definition
Adj.
Adjustable
Vout
Output
Vin
Input
Marking information：
A：Means assembly year and weeks
Max.15V
-10C –125C
Year
Y
2010
0
Week 1 2
W
A B
2011 2012 2013 …
1
2
3
…
…
…
26 27 … 52
Z
…
B：Means Manufacture LOT No.
C：Means Output Voltage Value
D：Means Temp. Range&Rohs Std
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53
A
BL1084
ELECTRICAL CHARACTERISTICS
Tj=25℃
Symbol
Vref
Vout
ΔVout
ΔVout
Parameter
Reference
Voltage
Conditions
Min
Typ
Max
Unit
10mA≤Iout≤5A ,1.5V≤Vin-Vout≤5V
1.225
1.25
1.275
V
BL1084-1.80V
Iout=0mA,Vin=4.8V,Tj=25℃
10mA≤Iout≤5A ,3.4V≤Vin≤7V
1.773
1.764
1.80
1.80
1.827
1.836
V
BL1084-2.50V
Iout=0mA,Vin=5.5V,Tj=25℃
10mA≤Iout≤5A ,4.1V≤Vin≤7V
2.462
2.45
2.50
2.50
2.537
2.55
V
BL1084-3.3V
Iout=0mA,Vin=6.3V,Tj=25℃
10mA ≤Iout≤5A ,4.9V≤Vin≤8V
3.25
3.234
3.3
3.3
3.350
3.366
V
BL1084-5.0V
Iout=0mA,Vin=8.0V,Tj=25℃
10mA ≤Iout≤5A ,6.6V≤Vin≤10V
4.925
4.90
5.0
5.0
5.075
5.10
V
BL1084-ADJ
Iout=10mA, 2.85V≤Vin≤10V
10
40
mV
BL1084-1.8V
Iout=10mA, 3.4V≤Vin≤10V
10
40
mV
BL1084-2.5V
Iout=10mA, 4.1V≤Vin≤10V
10
40
mV
BL1084-3.3V
Iout=10mA, 4.9V≤Vin≤10V
10
40
mV
BL1084-5.0V
Iout=10mA, 6.6V≤Vin≤10V
10
40
mV
BL1084-ADJ (ADJ connected to ground)
Vin-Vout=1.6V, 10mA≤Iout≤5A
16
50
mV
BL1084-1.8V
Vin-Vout=1.6V, 0≤Iout≤5A
16
50
mV
BL1084-2.5V
Vin-Vout=1.6V, 0≤Iout≤5A
16
50
mV
BL1084-3.3V
Vin-Vout=1.6V, 0≤Iout≤5A
16
50
mV
BL1084-5.0V
Vin-Vout=1.6V, 0≤Iout≤5A
16
50
mV
Output Voltage
Line Regulation
(note 1)
Load Regulation
(note 1,2)
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BL1084
Vin-Vout
Ilimit
Iq
IAdj
Dropout Voltage
(note 3)
ΔVout, ΔVref =1%，Iout=5A
Current Limit
Vin-Vout=3V, Tj=25℃
7
BL1084-ADJ
3
10
mA
Vin=10V
5
10
mA
2.85V ≤Vin≤4.25V, 10mA≤ Iout≤5A
45
120
uA
Minimum
Load Current
(note 4)
Quiescent
Current
Adjust Pin Current
(Adjustable Version)
Ripple
Rejection
Ichange
1.4
F=120Hz,Cout=25uF( tan),
Iout=5A,Vin-Vout=3V
Adjust Pin
Current
Change
Temperature
Stability
 JC
Thermal
Resistance
junction to case
OTP
Over
Temperature
Protection
60
10mA≤Iout≤5A
1.5V≤Vin-Vout ≤6V
V
A
65
0.4
Iout=10mA,
Vin-Vout=1.5V
TO-252
TO-263
TO-220
1.6
dB
10
µA
0.5
%
12.5
3
3
℃/W
150
℃
Note1: Line Regulation and Load Regulation in Table1 are tested under constant junction temperature.
Note2: When load current varies between 0~5A and Vin-Vout ranges from 1.5V~6V at constant junction
temperature, the parameter is satisfied the criterion in table. If temperature varies between -40℃≤TA≤85℃，
it needs output current to be larger than 10mA to satisfy the criterion.
Note3: Dropout Voltage is the voltage difference between the input and output pin when the input voltage is
minimum to maintain the lowest spec output voltage.
Dropout Voltage is the voltage difference between the input and output pin under Iout=5A and the following
test condition:
1) Find out output voltage value ( denoted as Vout1) when Vin1=Vout+1.5V
2) Decrease input voltage until output voltage is equal to 98.5% of Vout1, and denote the Vin and Vout as
Vin2 and Vout2.
3) Vdropout=Vin2-Vout2.
Note4: Minimum Load Current is defined as the minimum output current necessary to maintain regulation.
Specified output accuracy can be met when the output current exceeds the minimum load current (10mA)
and the dropout voltage (Vin-Vout) lies between 1.5V and 6V.
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BL1084
BLOCK DIAGRAM
Fig 3. Block Diagram
DETAILED DESCRIPTION
BL1084 is a series of low dropout voltage three terminal regulators. Its circuit has a trimmed bandgap
reference to ensure output voltage accuracy independent of temperature variance. On-chip thermal shutdown
provides protection against overload and conditions as elevated ambient temperature.
Its application circuitry requires minimum number of external components. Both fixed voltage and
adjustable voltage versions need input and output capacitors to assure output voltage stability. Any desired
output voltage from 1.25V to 10V can be achieved with adjustable version by assigning proper values to two
external resistors in its application circuitry (as shown in Fig.4, as R1, R2 are the two external resistors.).
.
TYPICAL APPLICATION
BL1084 has an adjustable version and fixed versions, Fig.4 shows their typical application circuitry.
A 10uF tan capacitor connected between input and GND as bypass capacitor and a 22uF tan capacitor
between output and GND are recommended for all application.
Using a bypass capacitor (CAdj) between the adjust terminal and ground can improve ripple rejection. The
bypass capacitor prevents ripple from being amplified in case the output voltage is increased. The impedance
of CAdj should be less than the resistance of R1 to prevent ripple from being amplified at any frequency. As
R1 is normally in the range of 120Ω~200Ω, the value of CAdj should satisfy the following condition:
1/(2* FrequencyRipple *Cadj)<R1
A 10µF tan capacitor is recommended.
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BL1084
BL1084
BL1084
Fig 4. Typical Application of BL1084
EXPLANATION
The output voltage of adjustable version satisfies this followed equation:
Vout=VRef× (1+R2/R1)+IAdj×R2.
The second term IAdj×R2 can be ignored since the adjustable pin current IAdj (~ 50µA) is much less than the
current through R1 (~ 4mA).
The value of R1 is preferred in the range of 120Ω～200Ω and the total output current of the adjustable
version of BL1084 needs to exceed 10mA to assure normal chip operation.
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BL1084
TYPICAL PERFORMANCE CHARACTERISTICS
Output Voltage VS. Temperature
1.5
1.8
1.4
1.795
1.3
1.79
Vout(V)
Dropout(V)
Dropout Voltage VS. Output Current
1.2
1.1
1.785
1
1.78
0.9
1.775
0.8
0.5
1.5
2.5
3.5
1.77
4.5
0
Iout(A)
10
20
30
40
50
60
70
80
T( C)
Output Voltage VS. Output Current
1.9
1.8
1.7
Vout(V)
1.6
1.5
1.4
1.3
1.2
1.1
1
0
1
2
3
4
5
Iout(A)
Load Transient Response
Line Transient Response
3A
Vin
0.1A
Vout
Vout
CH1 1.5A
Vin=4.25V
CH2 100mV
Vout=1.25V
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CH1 1.0V
CH2 20.0mV
M 250us
Vin=3.25V to 5.25V Vout=1.25V
Iout=200mA
Cin=1uF (tan) Cout=10uF(tan)
M 100us
Iout=100mA to 3A
Cin=Cout=10uF(tan)
7
BL1084
PACKAGE LINE
Package
TO-252
Devices per reel
Package specification：
Taping dimension：
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8
2500
Unit
mm
BL1084
Taping reel dimension：
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9
BL1084
Package
TO-263-2L
Devices per reel
Package specification：
Taping dimension：
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10
800
Unit
mm
BL1084
Taping reel dimension：
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11
BL1084
Package
TO-263-3L
Devices per reel
Package specification：
Taping dimension：
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12
800
Unit
mm
BL1084
Taping reel dimension：
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13