HI-SINCERITY
MICROELECTRONICS CORP.
Spec. No. : Preliminary Data
Issued Date : 1998.06.01
Revised Date : 1999.08.01
Page No. : 1/5
H1084U Series
5A LOW DROPOUT POSITIVE VOLTAGE REGULATOR
Features
•
Low Dropout Voltage 1.2V at 5A
•
Adjustable or Fixed Voltage.
•
Line Regulation Typically 0.015%.
•
Load Regulation Typically 0.05%.
•
Adjust Pin Current Less Than 90 uA.
•
Over Current Protection.
•
Thermal Protection.
Applications
•
High Efficiency Linear Regulators.
•
Post Regulators For Switching Supplies.
•
5V to 3.3V Voltage Converter.
•
Battery Charger.
General Description
The H1084U is a 5A low-dropout positive voltage regulator. It is available in fixed and adjustable output voltage
versions. Over Current and thermal protection are integrated onto the chip. Output current will decrease while it
reaches the pre-set current or temperature limit. The dropout voltage is specified at 1.2V Maximum at full rated
output current. H1084U Series provides excellent regulation over variations due to changes in line, load and
temperature. H1084U is three terminal regulator and available in popular packages.
Device Selection Guide
Device
H1084U
H1084-3.3U
Output Voltage
1.3V to 4V
3.3
Package
TO-263
Absolute Maximum Ratings
Parameter
Input Voltage
Power Dissipation
Thermal Resistance Junction To Case TO-263
Thermal Resistance Junction To Ambient TO-263
Operating Junction Temperature Range
Storage Temperature Range
Lead Temperature (Soldering) 10 Sec
Symbol
V
IN
P
D
θ
JC
θ
JA
T
j
T
STG
T
LEAD
Maximum
7
Internally Limited
3
50
0 To 125
-65 To 150
260
Units
V
W
°C/W
°C/W
°C
°C
°C
Typical Application
H1084-3.3U
+
4.75V to
5.25V
DC
10uF
TAN
10uF
TAN
Load
GND
HSMC Product Specification
HI-SINCERITY
MICROELECTRONICS CORP.
Block Diagram
Input
Spec. No. : Preliminary Data
Issued Date : 1998.06.01
Revised Date : 1999.08.01
Page No. : 2/5
Current
Limiting
Amplifier
Thermal
Protection
Output
Error
AMP
Bandcap
Reference
ADJ/COM
Electrical Characteristics
H1084U (adj version)
Parameter
Reference Voltage
Adj Voltage
Line Regulation
Load Regulation
Dropout Voltage
∆V
OUT
,
∆V
REF
=1%
Current Limit
Temperature Coeff.
Adjust Pin Current
Adjust Pin Current Change
Temperature Stability
Minimum Load Current
RMS Output Noise
Ripple Rejection Ratio
Symbol
V
REF
Reg
LINE
Reg
LOAD
V
D
I
S
T
C
I
adj
∆I
adj
T
S
I
O
V
N
R
A
Symbol
V
O
Reg
LINE
Reg
LOAD
V
D
I
S
I
Q
T
C
T
S
V
N
R
A
Test Conditions
V
IN
=5V, I
O
=10mA, T
j
=25°C
V
IN
=5V, I
O
=10mA, Over Temp.
V
IN
=2.75~7V, I
O
=10mA, T
j
=25°C
V
IN
=2.75~7V, I
O
=10mA, Over Temp.
V
IN
=5V, I
O
=10mA~5A,T
j
=25°C
V
IN
=5V, I
O
=10mA~5A, Over Temp.
V
IN
=2.75~7V, I
O
=10mA~5A
V
IN
=2.75~7V, Over Temp.
V
IN
=2.75~7V, I
O
=10mA~5A
V
IN
=2.75~7V, I
O
=10mA~5A,Tj=25°C
V
IN
=2.75~7V, I
O
=10mA~5A, Over Temp.
V
IN
=2.75~7V, I
O
=10mA~5A, Over Temp.
V
IN
=5V, I
O
=500mA, Over Temp.
V
IN
=5V
T
j
=25°C
V
IN
=5V, I
O
=5A, Over Temp.
Test Conditions
V
IN
=5V, I
O
=0A,T
j
=25°C
V
IN
=5V, I
O
=0A, Over Temp.
V
IN
=4.5~7V, I
O
=0A, T
j
=25°C
V
IN
=4.5~7V, I
O
=0A, Over Temp.
V
IN
=5V, I
O
=0A~5A,T
j
=25°C
V
IN
=5V, I
O
=0A~5A, Over Temp.
V
IN
=4.5~7V, I
O
=0A~5A, T
j
=25°C
V
IN
=4.5~7V, I
O
=0A~5A, Over Temp.
V
IN
=4.5~7V, Over Temp.
V
IN
=5V, I
O
=0A~5A,Over Temp.
V
IN
=4.5~7V, I
O
=0A~5A
V
IN
=5V, I
O
=500mA, Over Temp.
T
j
=25°C
V
IN
=5V, I
O
=5A, Over Temp.
Min
1.238
1.225
-
-
-
-
-
-
5
-
-
-
-
-
-
-
60
Typ
1.250
1.250
0.015
0.035
0.05
0.2
1
1
-
0.005
55
-
0.2
0.5
5
0.003
72
Max
1.262
1.275
0.2
0.2
0.3
0.4
-
1.2
-
-
-
90
5
-
10
-
-
Units
V
%
%
V
A
%/°C
uA
%
mA
%V
O
dB
H1084-3.3U
Parameter
Output Voltage
Fixed Voltage
Line Regulation
Load Regulation
Dropout Voltage
∆V
OUT
,
∆V
REF
=1%
Current Limit
Quiescent Current
Fixed Model
Temperature Coeff.
Temperature Stability
RMS Output Noise
Ripple Rejection Ratio
Min
3.267
3.234
-
-
-
-
-
-
5
-
-
-
-
-
Typ
3.3
3.3
0.015
0.035
0.05
0.2
1
1
7.5
12
0.005
0.5
0.003
72
Max
3.333
3.366
0.2
0.2
0.3
0.4
-
1.2
-
13
-
-
-
-
Units
V
%
%
V
A
mA
%/°C
%
%V
O
dB
HSMC Product Specification
HI-SINCERITY
MICROELECTRONICS CORP.
Applications Description
•
Output Voltage Adjustment
Like most regulators, the H1084U regulates the output
by comparing the output voltage to an internally generated
reference voltage. On the adjustable version, the V
REF
is
available externally as 1.25V between V
OUT
and ADJ. The
voltage ratio formed by R
1
and R
2
should be set to conduct
10mA (minimum output load). The output voltage is given
by the following equation : V
OUT
=V
REF
(1+R
2
/R
1
) + I
ADJ
R
2
On fixed versions of H1084U, the voltage divider is
provided internally.
In
V
IN
ADJ
Spec. No. : Preliminary Data
Issued Date : 1998.06.01
Revised Date : 1999.08.01
Page No. : 3/5
Out
V
OUT
V
REF
I
ADJ
10uA
R1
R2
•
Thermal Protection
H1084U has thermal protection which limits junction
V
OUT
=V
REF
(1+R
2
/R
1
) + I
ADJ
R
2
temperature to 150°C. However, device functionality is
only guaranteed to a maximum junction temperature of
+125°C.
The power dissipation and junction temperature for H1084U in TO-263 package given by
P
D
=(V
IN
- V
OUT
) I
OUT
, T
JUNCTION
=T
AMBIENT
+(P
D
xθ
JA
), Note : T
JUNCTION
must not exceed 125°C
•
Current Limit Protection
H1084U is protected against overload conditions. Current protection is triggered at typically 7.5A.
•
Stability And Load Regulation
H1084U requires a capacitor from V
OUT
to GND to
R
P
provide compensation feedback to the internal gain stage.
Parasitic
This is to ensure stability at the output terminal. Typically, a
Line Resistance
In
Out
10uF tantalum or 50uF aluminum electrolytic is sufficient.
Adj
V
IN
Note : It is important that the ESR for this capacitor does
R1
not exceed 0.5Ω.
Connect
RL
R1 to Case
The output capacitor does not have a theoretical upper
limit and increasing its value will increase stability. C
OUT
=
R2
100 uF or more is typical for high current regulator design.
H1084U load regulation is limited by the resistance of
the wire connecting it to the load(R
P
). For the adjustable
Connect
version, the best load regulation is accomplished when the
R2 to Load
top of the resistor divider(R
1
) is connected directly to the
output pin of the H1084U. When so connected, R
P
is not
multiplied by the divider ratio. For fixed output versions,
the top of R
1
is internally connected to the output and ground pin can be connected to low side of the load as a
negative side sense if, so desired.
•
Thermal Consideration
The H1084U series contain thermal limiting circuitry designed to protect itself for over-temperature conditions.
Even for normal load conditions, maximum junction temperature ratings must not be exceeded. As mention in
thermal protection section, we need to consider all sources of thermal resistance between junction and ambient.
It contains junction-to-case, case-to-heat-sink interface and heat sink resistance itself. An additional heat sink is
applied externally sometimes. It can increase the maximum power dissipation. For example, the equivalent
junction temperature of 1A output current is 115°C without external heat sink. Under the same junction
temperature IC can operates 3A with an adequate heat sink. Therefore, to attach an extra heat sink is
recommended.
Junction-to-case thermal resistance is specified from the IC junction to the bottom of the case directly below the
die. The bonding wires are appending paths. The former is the lowest resistance path. Proper mounting is
required to ensure the best possible thermal flow this area of the package to the heat sink. Thermal compound at
the case-to-heat-sink interface is strongly recommended. The case of all devices in this series is electrically
connected to the output. Therefore, if the case of the device must be electrically isolated, a thermally conductive
spacer can be used, as long its thermal resistance is considered.
HSMC Product Specification
HI-SINCERITY
MICROELECTRONICS CORP.
•
Protection Diode
Spec. No. : Preliminary Data
Issued Date : 1998.06.01
Revised Date : 1999.08.01
Page No. : 4/5
(The figure is shown as Regulator with Reverse Diode Protection in advanced applications)
In general operation, H1084U does not need any protection diodes. From the cross-section structure of
H1084U, the output pin is connected to P+ substrate, and the input pin is connected to N- well. There is a
parasitic reverse diode between them. It can handle microsecond surge currents of 50A to 100A. Even with large
output capacitance, it is very difficult to get those values of surge currents in normal operation. Only with high
value output capacitors, such as 1000uF. And with the input pin instantaneously shorted to ground. can damage
occur. A crowbar circuit at the input of the H1084U can generate those kinds of currents, and a diode from output
to input is recommended. Normal power supply cycling or even plugging and unplugging in the system will not
generate currents large enough to do any damage.
•
Advanced Applications
H 1084U
Vin=7V
1K
2K
10uF
GND
10uF
GND
10uF
Vin
H 1084U
*20m ohm
GND
Vo
Vo=1.5~3.45
H 1084U
*20m ohm
GND
10uF
10uF
GND
GND
GND
Paralleling Regulators
Adjustable Output Voltage
*20m ohm is ballast resistance..
The inter - connection of #18 wire could act as ballast resistance.
H 1084U
V
in
1K
V
O
Vin
H 1084U
Vo
10uF
10uF
Zener Diode
or Voltage Reference
GND
10uF
10uF
GND
GND
100uF
GND
GND
GND
*Vo = Vref ( 1+R2/R1 ) + Iadj x R2
**Optional for improved ripple rejection.
*Please refer to "protection diode section" for detailed description.
Regulator with Reference
Regulator with Reverse Diode Protection
HSMC Product Specification
HI-SINCERITY
MICROELECTRONICS CORP.
TO-263 Dimension
Marking :
A
2
C
E
Spec. No. : Preliminary Data
Issued Date : 1998.06.01
Revised Date : 1999.08.01
Page No. : 5/5
α
1
F
HSMC Logo
Part Number
Date Code
Product Series
Rank
B
D
1
I
J
K
L
2
3
G
Style : Pin 1.Ground/ADJ 2.Vout 3.Vin
α
2
α
3
H
3-Lead TO-263 Plastic Surface Mounted Package
HSMC Package Code : U
*:Typical
DIM
A
B
C
D
E
F
G
H
Inches
Min.
Max.
0.3800
0.4050
0.3300
0.3700
-
0.0550
0.5750
0.6250
0.1600
0.1900
0.0450
0.0550
0.0900
0.1100
0.0180
0.0290
Millimeters
Min.
Max.
9.65
10.29
8.38
9.40
-
1.40
14.61
15.88
4.06
4.83
1.14
1.40
2.29
2.79
0.46
0.74
DIM
I
J
K
L
α1
α2
α3
Inches
Min.
Max.
0.0500
0.0700
-
*0.1000
0.0450
0.0550
0.0200
0.0390
-
-
-
-
-
-
Millimeters
Min.
Max.
1.27
1.78
-
*2.54
1.14
1.40
0.51
0.99
6°
8°
6°
8°
0°
5°
Notes :
1.Dimension and tolerance based on our Spec. dated Jan. 09,1998.
2.Controlling dimension : millimeters.
3.Maximum lead thickness includes lead finish thickness, and minimum lead thickness is the minimum thickness of base material.
4.If there is any question with packing specification or packing method, please contact your local HSMC sales office.
Material :
•
Lead : 42 Alloy ; solder plating
•
Mold Compound : Epoxy resin family, flammability solid burning class:UL94V-0
Important Notice:
•
All rights are reserved. Reproduction in whole or in part is prohibited without the prior written approval of HSMC.
•
HSMC reserves the right to make changes to its products without notice.
•
HSMC semiconductor products are not warranted to be suitable for use in Life-Support Applications, or systems.
•
HSMC assumes no liability for any consequence of customer product design, infringement of patents, or application assistance.
Head Office And Factory :
•
Head Office
(Hi-Sincerity Microelectronics Corp.) : 10F.,No. 61, Sec. 2, Chung-Shan N. Rd. Taipei Taiwan R.O.C.
Tel : 886-2-25212056 Fax : 886-2-25632712, 25368454
•
Factory 1 :
No. 38, Kuang Fu S. Rd., Fu-Kou Hsin-Chu Industrial Park Hsin-Chu Taiwan. R.O.C
Tel : 886-3-5983621~5 Fax : 886-3-5982931
•
Factory 2 :
No. 17-1, Ta-Tung Rd., Fu-Kou Hsin-Chu Industrial Park Hsin-Chu Taiwan. R.O.C
Tel : 886-3-5977061 Fax : 886-3-5979220
HSMC Product Specification
Microchip MCU
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