KD1084AXX
KD1084AXX18
5 A low drop positive voltage regulator adjustable and fixed
Features
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Typical dropout 1.3 V (at 5 A)
Three terminal adjustable or fixed output
voltage 1.8 V, 3.3 V.
Guaranteed output current up to 5 A
Output tolerance ± 1% at 25 °C and ± 2% in full
temperature range for the "A" version
Output tolerance ± 2% at 25 °C and ± 3% in full
temperature range internal power and thermal
limit
Wide operating temp. range -40 °C to 125 °C
Package available: D²PAK and DPAK
Pinout compatibility with standard adjustable
VREG
D²PAK
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"A" version and ± 2% at 25 °C for standard
version.
Description
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The KD1084 is a low drop voltage regulator able
to provide up to 5 A of output current. Dropout is
guaranteed at a maximum of 1.5 V at the
maximum output current, decreasing at lower
loads. The KD1084 is pin to pin compatible with
he older 3-terminal adjustable regulators but has
better performances in term of drop and output
tolerance. A 2.85 V output version is suitable for
SCSI-2 active termination. Unlike PNP regulators,
where a part of the output current is wasted as
quiescent current, the KD1084 quiescent current
flows into the load, so increase efficiency. Only a
10 µF minimum capacitor is need for stability. The
devices are supplied in D²PAK and DPAK. On chip
trimming allows the regulator to reach a very tight
output voltage tolerance, within ±1% at 25 °C for
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DPAK
Table 1.
Device summary
Order codes
D²PAK
DPAK
Output voltage
1.8 V
KD1084ADT-R
ADJ
Tolerance
1%
1%
KD1084AD2T18R
May 2011
Doc ID 8761 Rev 11
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Contents
KD1084AXX, KD1084AXX18
Contents
1
2
3
4
5
6
7
8
Diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
Pin configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
Maximum ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
Schematic application . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
Electrical characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
Typical application . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
Package mechanical data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
Revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
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Doc ID 8761 Rev 11
KD1084AXX, KD1084AXX18
Diagram
1
Figure 1.
Diagram
Schematic diagram
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Pin configuration
KD1084AXX, KD1084AXX18
2
Figure 2.
Pin configuration
Pin connections (top view)
D²PAK
DPAK
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KD1084AXX, KD1084AXX18
Maximum ratings
3
Table 2.
Maximum ratings
Absolute maximum ratings
Parameter
DC input voltage
Output current
Power dissipation
Storage temperature range
Operating junction temperature range
Value
12
Internally limited
Internally limited
-55 to +150
-40 to +125
°C
Unit
V
Symbol
V
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T
STG
T
OP
Note:
Absolute maximum ratings are those values beyond which damage to the device may occur.
Functional operation under these condition is not implied.
Thermal data
Parameter
Thermal resistance junction-case
Thermal resistance junction-ambient
Table 3.
Symbol
R
thJC
R
thJA
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Unit
°C
D²PAK
°C/W
°C/W
62.5
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