ST KD1084AD2T18R, KD1084ADT-R User Manual
5 A low drop positive voltage regulator adjustable and fixed
Features
■ 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
KD1084AXX
KD1084AXX18
D²PAK
"A" version and ± 2% at 25 °C for standard
version.
DPAK
Description
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
Table 1. Device summary
D²PA K DPAK Out p ut vo l t age Tol e ran c e
KD1084AD2T18R 1.8 V 1%
Order codes
KD1084ADT-R ADJ 1%
May 2011 Doc ID 8761 Rev 11 1/17
www.st.com
17
Contents KD1084AXX, KD1084AXX18
Contents
1 Diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
2 Pin configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
3 Maximum ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
4 Schematic application . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
5 Electrical characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
6 Typical application . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
7 Package mechanical data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
8 Revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
2/17 Doc ID 8761 Rev 11
KD1084AXX, KD1084AXX18 Diagram
1 Diagram
Figure 1. Schematic diagram
Doc ID 8761 Rev 11 3/17
Pin configuration KD1084AXX, KD1084AXX18
2 Pin configuration
Figure 2. Pin connections (top view)
D²PAK
DPAK
4/17 Doc ID 8761 Rev 11
KD1084AXX, KD1084AXX18 Maximum ratings
3 Maximum ratings
Table 2. Absolute maximum ratings
Symbol Parameter Value Unit
T
P
T
V
I
I
O
D
STG
OP
DC input voltage 12 V
Output current Internally limited
Power dissipation Internally limited
Storage temperature range -55 to +150 °C
Operating junction temperature range -40 to +125 °C
Note: Absolute maximum ratings are those values beyond which damage to the device may occur.
Functional operation under these condition is not implied.
Table 3. Thermal data
Symbol Parameter DPAK D²PAK Unit
R
R
thJC
thJA
Thermal resistance junction-case 8 3 °C/W
Thermal resistance junction-ambient 100 62.5 °C/W
Doc ID 8761 Rev 11 5/17
Schematic application KD1084AXX, KD1084AXX18
4 Schematic application
Figure 3. Application circuit
R
2
V
REF
⎛⎞
1
------ -+
⋅=
⎝⎠
R
1
V
O
6/17 Doc ID 8761 Rev 11
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