LT1585ACT Linear Technology, LT1585ACT Datasheet - Page 5

• Manufacturer Part Number: LT1585ACT
• Description: IC LDO REG 5A ADJ TO220-3
• Manufacturer: Linear Technology

Specifications of LT1585ACT

• Regulator Topology: Positive Adjustable
• Voltage - Output: 1.25 ~ 5.5 V
• Voltage - Input: 2.45 ~ 7 V
• Voltage - Dropout (typical): 1.2V @ 5A
• Number Of Regulators: 1
• Current - Limit (min): 5A
• Operating Temperature: 0°C ~ 125°C
• Mounting Type: Through Hole
• Package / Case: TO-220-3 (Straight Leads)
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant
• Current - Output: -

APPLICATIONS
SI PLIFIED SCHE ATIC
General
The LT1585A/LT1585A-3.3 3-terminal regulators are
easy to use and have all the protection features expected
in high performance linear regulators. The devices are
short-circuit protected, safe-area protected and provide
thermal shutdown to turn off the regulators should the
junction temperature exceed about 150°C. The regulators
include an adjustable and a fixed 3.3V version.
These ICs are pin compatible with the LT1083/LT1084/
LT1085 family of linear regulators but offer lower dropout
voltage and faster transient response. The trade-off for this
improved performance is a 7V maximum supply voltage.
Similar to the LT1083/LT1084/LT1085 family, the
LT1585A/LT1585A-3.3 regulators require an output ca-
pacitor for stability. However, the improved frequency
compensation permits the use of capacitors with much
lower ESR while still maintaining stability. This is critical in
addressing the needs of modern, low voltage, high speed
microprocessors.
W
U
V
IN
INFORMATION
U
W
FOR FIXED VOLTAGE DEVICE
GND
W
ADJ
THERMAL
LIMIT
U
Current generation microprocessors cycle load current
from almost zero to amps in tens of nanoseconds. Output
voltage tolerances are tighter and include transient re-
sponse as part of the specification. The LT1585A/
LT1585A-3.3 are specifically designed to meet the fast
current load-step requirements of these microprocessors
and save total cost by needing less output capacitance in
order to maintain regulation.
Stability
The circuit design in the LT1585A/LT1585A-3.3 requires
the use of an output capacitor as part of the frequency
compensation. For all operating conditions, the addition
of a 100µF solid tantalum or aluminum electrolytic on the
output ensures stability. Normally, the LT1585A/
LT1585A-3.3 can use smaller value capacitors. Many
different types of capacitors are available and have widely
varying characteristics. These capacitors differ in capaci-
+
–
LT1585A/LT1585A-3.3
LT1585A • BD
V
OUT
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