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Datasheet: H1085U (Hi-Sincerity Mocroelectronics)

3A LOW DROPOUT POSITIVE VOLTAGE REGULATOR

 

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Hi-Sincerity Mocroelectronics
HI-SINCERITY
MICROELECTRONICS CORP.
Spec. No. : Preliminary Data
Issued Date : 1998.06.01
Revised Date : 1999.08.01
Page No. : 1/5
HSMC Product Specification
H1085U Series
3A LOW DROPOUT POSITIVE VOLTAGE REGULATOR
Features
Low Dropout Voltage 1.2V at 3A.
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 H1085U is a 3A 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. H1085U Series provides excellent regulation over variations due to changes in line, load and
temperature. H1085U is three terminal regulator and available in popular packages.
Device Selection Guide
Device
Output Voltage
Package
H1085U
1.3V to 4V
H1085-3.3U
3.3
TO-263
Absolute Maximum Ratings
Parameter
Symbol
Maximum
Units
Input Voltage
V
IN
7
V
Power Dissipation
P
D
Internally Limited
W
Thermal Resistance Junction To Case TO-263
JC
3
C/W
Thermal Resistance Junction To Ambient TO-263
JA
50
C/W
Operating Junction Temperature Range
T
j
0 To 125
C
Storage Temperature Range
T
STG
-65 To 150
C
Lead Temperature (Soldering) 10 Sec
T
LEAD
260
C
Typical Application
+
H1085-3.3U
10uF
TAN
10uF
TAN
4.75V to
5.25V
DC
GND
Load
HI-SINCERITY
MICROELECTRONICS CORP.
Spec. No. : Preliminary Data
Issued Date : 1998.06.01
Revised Date : 1999.08.01
Page No. : 2/5
HSMC Product Specification
Block Diagram
Electrical Characteristics
H1085U (adj version)
Parameter
Symbol
Test Conditions
Min
Typ
Max
Units
V
IN
=5V, I
O
=10mA, T
j
=25
C
1.238
1.250
1.262
Reference Voltage
Adj Voltage
V
REF
V
IN
=5V, I
O
=10mA, Over Temp.
1.225
1.250
1.275
V
V
IN
=2.75~7V, I
O
=10mA, T
j
=25
C
-
0.015
0.2
Line Regulation
Reg
LINE
V
IN
=2.75~7V, I
O
=10mA, Over Temp.
-
0.035
0.2
%
V
IN
=5V, I
O
=10mA~3A,T
j
=25
C
-
0.05
0.3
Load Regulation
Reg
LOAD
V
IN
=5V, I
O
=10mA~3A, Over Temp.
-
0.2
0.4
%
V
IN
=2.75~7V, I
O
=10mA~3A, T
j
=25
C
-
1
-
Dropout Voltage
V
OUT
,
V
REF
=1%
V
D
V
IN
=2.75~7V, I
O
=10mA~3A, Over Temp.
-
1
1.2
V
Current Limit
I
S
V
IN
=2.75~7V, Over Temp.
3
4.5
-
A
Temperature Coeff.
T
C
V
IN
=2.75~7V, I
O
=10mA~3A
-
0.005
-
%/
C
V
IN
=2.75~7V, I
O
=10mA~3A,Tj=25
C
-
55
-
Adjust Pin Current
I
adj
V
IN
=2.75~7V, I
O
=10mA~3A, Over Temp.
-
-
90
Adjust Pin Current Change
I
adj
V
IN
=2.75~7V, I
O
=10mA~3A, Over Temp.
-
0.2
5
uA
Temperature Stability
T
S
V
IN
=5V, I
O
=500mA, Over Temp.
-
0.5
-
%
Minimum Load Current
I
O
V
IN
=5V
-
5
10
mA
RMS Output Noise
V
N
T
j
=25
C
-
0.003
-
%
Ripple Rejection Ratio
R
A
V
IN
=5V, I
O
=3A, Over Temp.
60
72
-
dB
H1085-3.3U
Parameter
Symbol
Test Conditions
Min
Typ
Max
Units
V
IN
=5V, I
O
=0A,T
j
=25
C
3.267
3.3
3.333
Output Voltage
Fixed Voltage
V
O
V
IN
=5V, I
O
=0A, Over Temp.
3.234
3.3
3.366
V
V
IN
=4.5~7V, I
O
=0A, T
j
=25
C
-
0.015
0.2
Line Regulation
Reg
LINE
V
IN
=4.5~7V, I
O
=0A, Over Temp.
-
0.035
0.2
%
V
IN
=5V, I
O
=0A~3A,T
j
=25
C
-
0.05
0.3
Load Regulation
Reg
LOAD
V
IN
=5V, I
O
=0A~3A, Over Temp.
-
0.2
0.4
%
V
IN
=4.5~7V, I
O
=0A~3A, T
j
=25
C
-
1
-
Dropout Voltage
V
OUT
,
V
REF
=1%
V
D
V
IN
=4.5~7V, I
O
=0A~3A, Over Temp.
-
1
1.2
V
Current Limit
I
S
V
IN
=4.5~7V, Over Temp.
3
4.5
-
A
Quiescent Current
Fixed Model
I
Q
V
IN
=5V, I
O
=0A~3A,Over Temp.
-
12
13
mA
Temperature Coeff.
T
C
V
IN
=4.5~7V, I
O
=0A~3A
-
0.005
-
%/
C
Temperature Stability
T
S
V
IN
=5V, I
O
=500mA, Over Temp.
-
0.5
-
%
RMS Output Noise
V
N
T
j
=25
C
-
0.003
-
%
Ripple Rejection Ratio
R
A
V
IN
=5V, I
O
=3A, Over Temp.
60
72
-
dB
Current
Limiting
Amplifier
Thermal
Protection
Error
AMP
Input
Output
ADJ/COM
Bandcap
Reference
HI-SINCERITY
MICROELECTRONICS CORP.
Spec. No. : Preliminary Data
Issued Date : 1998.06.01
Revised Date : 1999.08.01
Page No. : 3/5
HSMC Product Specification
Applications Description
Output Voltage Adjustment
Like most regulators, the H1085U 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 H1085U, the voltage divider is
provided internally.
Thermal Protection
H1085U has thermal protection which limits junction
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 H1085U in TO-263 package given by
P
D
=(V
IN
- V
OUT
) I
OUT
, T
JUNCTION
=T
AMBIENT
+(P
D
x
JA
), Note : T
JUNCTION
must not exceed 125
C
Current Limit Protection
H1085U is protected against overload conditions. Current protection is triggered at typically 4.5A.
Stability And Load Regulation
H1085U requires a capacitor from V
OUT
to GND to
provide compensation feedback to the internal gain stage.
This is to ensure stability at the output terminal. Typically, a
10uF tantalum or 50uF aluminum electrolytic is sufficient.
Note : It is important that the ESR for this capacitor does
not exceed 0.5
.
The output capacitor does not have a theoretical upper
limit and increasing its value will increase stability. C
OUT
=
100 uF or more is typical for high current regulator design.
H1085U load regulation is limited by the resistance of
the wire connecting it to the load(R
P
). For the adjustable
version, the best load regulation is accomplished when the
top of the resistor divider(R
1
) is connected directly to the
output pin of the H1085U. 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 H1085U 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.
RL
R1
R2
Connect
R1 to Case
Connect
R2 to Load
Out
In
Adj
R
P
Parasitic
Line Resistance
V
IN
V
OUT
=V
REF
(1+R
2
/R
1
) + I
ADJ
R
2
V
IN
R1
R2
V
REF
In
Out
ADJ
I
ADJ
10uA
V
OUT
HI-SINCERITY
MICROELECTRONICS CORP.
Spec. No. : Preliminary Data
Issued Date : 1998.06.01
Revised Date : 1999.08.01
Page No. : 4/5
HSMC Product Specification
Protection Diode
(The figure is shown as Regulator with Reverse Diode Protection in advanced applications)
In general operation, H1085U does not need any protection diodes. From the cross-section structure of
H1085U, 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 H1085U 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
10uF
100uF
GND
GND
GND
Vin
Vo
*Please refer to "protection diode section" for detailed description.
Regulator with Reverse Diode Protection
10uF
1K
10uF
10uF
Zener Diode
or Voltage Reference
GND
GND
GND
*Vo = Vref ( 1+R2/R1 ) + Iadj x R2
**Optional for improved ripple rejection.
Regulator with Reference
V
in
V
O
*20m ohm
*20m ohm
10uF
10uF
Vin
Vo
GND
GND
GND
GND
Paralleling Regulators
*20m ohm is ballast resistance..
The inter - connection of #18 wire could act as ballast resistance.
1K
2K
10uF
10uF
10uF
Vin=7V
Vo=1.5~3.45
GND
GND
GND
Adjustable Output Voltage
H 1085U
H 1085U
H 1085U
H1085U
H 1085U
HI-SINCERITY
MICROELECTRONICS CORP.
Spec. No. : Preliminary Data
Issued Date : 1998.06.01
Revised Date : 1999.08.01
Page No. : 5/5
HSMC Product Specification
TO-263 Dimension
*:Typical
Inches
Millimeters
Inches
Millimeters
DIM
Min.
Max.
Min.
Max.
DIM
Min.
Max.
Min.
Max.
A
0.3800
0.4050
9.65
10.29
I
0.0500
0.0700
1.27
1.78
B
0.3300
0.3700
8.38
9.40
J
-
*0.1000
-
*2.54
C
-
0.0550
-
1.40
K
0.0450
0.0550
1.14
1.40
D
0.5750
0.6250
14.61
15.88
L
0.0200
0.0390
0.51
0.99
E
0.1600
0.1900
4.06
4.83
1
-
-
6
8
F
0.0450
0.0550
1.14
1.40
2
-
-
6
8
G
0.0900
0.1100
2.29
2.79
3
-
-
0
5
H
0.0180
0.0290
0.46
0.74
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
A
B
C
D
1
2
3
K
L
J
G
H
F
E
2
1
2
3
I
Style : Pin 1.Ground/ADJ 2.Vout 3.Vin
3-Lead TO-263 Plastic Surface Mounted Package
HSMC Package Code : U
Marking :
HSMC Logo
Part Number
Date Code
Product Series
Rank
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