Features
TO-220
LD1084
5 A low-drop positive voltage regulator adjustable
Datasheet - production data
LD1084 quiescent current flows into the load, so
to increase the efficiency. A minimum capacitor of
10 µF is needed for stability.
The device is supplied in TO-220. The on-chip
trimming allows the regulator to reach a very tight
output voltage tolerance, within ± 1% at 25 °C.
Table 1. Device summary
Order code Output voltage
LD1084V adjustable
• Typical dropout 1.3 V (at 5 A)
• Three-terminal adjustable output voltage
• Guaranteed output current up to 5 A
• 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
• Pinout compatibility with standard adjustable
VREG
Description
The LD1084 is a low-drop voltage regulator
providing 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 LD1084 is pin-to-pin compatible with
the older 3-terminal adjustable regulators, but it
has better performances in terms of drop and
output tolerance.
Unlike PNP regulators, where a part of the output
current is wasted as quiescent current, the
September 2013 DocID9035 Rev 10 1/16
This is information on a product in full production.
www.st.com
16
Contents LD1084
Contents
1 Diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
2 Pin configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
3 Maximum ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
4 Schematic application . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
5 Electrical characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
6 Typical performance characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
7 Package mechanical data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
8 Revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
2/16 DocID9035 Rev 10
LD1084 Diagram
1 Diagram
Figure 1. Schematic diagram
DocID9035 Rev 10 3/16
Pin configuration LD1084
$'-
287387
,1387
2 Pin configuration
Figure 2. Pin connections (top view)
4/16 DocID9035 Rev 10
LD1084 Maximum ratings
3 Maximum ratings
Table 2. Absolute maximum ratings
Symbol Parameter Value Unit
DC input voltage 30 V
Output current Internally limited mA
Power dissipation Internally limited mW
Storage temperature range -55 to +150 °C
Operating junction temperature range -40 to +125 °C
T
P
T
V
I
I
O
D
STG
OP
Note: Absolute maximum ratings are those values beyond which damage to the device may occur.
Functional operation under these conditions is not implied.
Table 3. Thermal data
Symbol Parameter TO-220 Unit
R
R
thJC
thJA
Thermal resistance junction-case 3 °C/W
Thermal resistance ju nction-ambient 50 °C/W
DocID9035 Rev 10 5/16
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