LD1085C
3 A low-drop, adjustable positive voltage regulator
Datasheet
-
production data
The device is supplied in DPAK. The on-chip
trimming allows the regulator to reach a very tight
output voltage tolerance, within ± 2% at 25 °C.
Table 1. Device summary
Order code
DPAK
LD1085CDT-R
DPAK (tape and reel)
Package
Features
•
Typical dropout 1.3 V (at 3 A)
•
3-terminal adjustable output voltage
•
Guaranteed output current up to 3 A
•
Output tolerance ± 2% at 25 °C and ± 3% in full
temperature range
•
Internal power and thermal limit
•
Wide operating temperature range -40 °C to
125 °C
•
Package available: DPAK
•
Pinout compatibility with standard adjustable
VREG
Description
The LD1085C is a low-drop voltage regulator,
providing up to 3 A of output current.The dropout
is guaranteed to be as low as 1.5 V at the
maximum current and it decreases at lower loads.
The LD1085C is pin-to-pin compatible with the old
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
LD1085C quiescent current flows into the load, so
to increase the efficiency. A minimum capacitor of
10 µF is needed for stability.
November 2013
This is information on a product in full production.
DocID8223 Rev 10
1/17
www.st.com
Contents
LD1085C
Contents
1
2
3
4
5
6
7
8
9
Diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
Pin configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
Maximum ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
Schematic application . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
Electrical characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
Typical applications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
Package mechanical data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
Packaging mechanical data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
Revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
2/17
DocID8223 Rev 10
LD1085C
Maximum ratings
3
Maximum ratings
Table 2. Absolute maximum ratings
Symbol
V
I
I
O
P
D
T
STG
T
OP
DC input voltage
Output current
Power dissipation
Storage temperature range
Operating junction temperature range
Parameter
Value
30
Internally limited
Internally limited
-55 to +150
-40 to +125
°C
°C
Unit
V
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
R
thJC
R
thJA
Parameter
Thermal resistance junction-case
Thermal resistance junction-ambient
DPAK
3
62.5
Unit
°C/W
°C/W
DocID8223 Rev 10
5/17
17
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