LD1084 series
5A Low drop positive voltage regulator adjustable and fixed
Feature summary
■
■
Typical dropout 1.3V (at 5A)
Three terminal adjustable or fixed output
voltage 1.5V, 1.8V, 2.5V, 2.85V, 3.3V, 3.6V,
5V, 8V, 9V, 12V.
Guaranteed output current up to 5A
Output tolerance ±1% at 25°C and ±2% in full
temperature range
Internal power and thermal limit
Wide operating temperature range -40°C to
125°C
Package available: TO-220,
D
2
PAK,
D
2
PAK/A
TO-220
D
2
PAK
■
■
■
■
D
2
PAK/A
■
■
Pinout compatibility with standard adjustable
VREG
Description
The LD1084 is a LOW DROP Voltage Regulator
able to provide up to 5A of Output Current.
Dropout is guaranteed at a maximum of 1.5V at
the maximum output current, decreasing at lower
loads. The LD1084 is pin to pin compatible with
the older 3-terminal adjustable regulators, but has
better performances in term of drop and output
tolerance.
A 2.85V 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 LD1084 quiescent current flows into
the load, so increase efficiency. Only a 10µF
minimum capacitor is need for stability.
The device is supplied in TO-220, D
2
PAK and
D
2
PAK/A. On chip trimming allows the regulator to
reach a very tight output voltage tolerance, within
±1% at 25°C.
Schematic diagram
April 2007
Rev. 6
1/29
www.st.com
29
LD1084 series
Contents
1
2
3
4
5
6
7
8
Pin configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
Maximum ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
Schematic application . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
Electrical characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
Typical application . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
Package mechanical data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
Order code
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27
Revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28
2/29
Maximum ratings
LD1084 series
2
Table 1.
Maximum ratings
Absolute maximum ratings
Parameter
DC Input voltage
Output current
Power dissipation
Storage temperature range
Operating junction temperature range
Value
30
Internally Limited
Internally Limited
-55 to +150
-40 to +125
Unit
V
mA
mW
°C
°C
Symbol
V
I
I
O
P
D
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
TO-220
3
50
D
2
PAK
3
62.5
Unit
°C/W
°C/W
Table 2.
Symbol
R
thJC
R
thJA
4/29
PCB Design
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