LD1585CXX
5 A low dropout fast response positive
voltage regulator adjustable
Features
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Typical dropout 1.2 V
Fast transient response
Three terminal adjustable
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
0 °C to 125 °C
Package available: TO-220
Pinout compatibility with standard adjustable
VREG
Description
The LD1585C is a low drop voltage regulator able
to provide up to 5 A of output current. Dropout is
guaranteed at a maximum of 1.4 V at the
maximum output current, decreasing at lower
loads. The device has been improved to be
utilized in low voltage applications where transient
response and minimum input voltage are critical.
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Table 1.
The most important feature of the device consist
in lower dropout voltage and very fast transient
response. 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 LD1585C quiescent current
flows into the load, so increase efficiency. Only a
10 µF minimum capacitor is need for stability.
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The device is supplied in TO-220. On chip
trimming allows the regulator to reach a very tight
output voltage tolerance, within ± 1 % at 25 °C.
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Device summary
Part number
LD1585CXX
Order code
LD1585CV
Output voltage
ADJ
July 2008
Rev 8
1/15
www.st.com
15
Contents
LD1585CXX
Contents
1
2
3
4
5
6
Diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
Pin configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
Maximum ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
Typical application . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
Electrical characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
Typical characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
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7
Package mechanical data . . . . . . . . . . . . . . .
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Revision history . . . . . . . . . . . . . . .
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LD1585CXX
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
30
Internally limited
Internally limited
-55 to +150
0 to +125
Unit
V
mA
mW
Symbol
V
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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
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Value
3
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Unit
°C/W
°C/W
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PCB Design
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