Datasheet

2
LT1581/LT1581-2.5
ABSOLUTE MAXIMUM RATINGS
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PACKAGE/ORDER INFORMATION
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ELECTRICAL CHARACTERISTICS
PRECONDITIONING
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100% Thermal Limit Functional Test
Consult factory for Industrial and Military grade parts.
LT1581CT7
LT1581CT7-2.5
ORDER PART
NUMBER
(Note 1)
V
POWER
Input Voltage ................................................ 6V
V
CONTROL
Input Voltage ........................................... 13V
Operating Junction Temperature Range
Control Section...................................... 0°C to 125°C
Power Transistor ................................... 0°C to 150°C
Storage Temperature ............................ –65°C to 150°C
Lead Temperature (Soldering, 10 sec).................. 300°C
*PIN2 = NC FOR LT1581CT7, GND FOR LT1581CT7-2.5
T7 PACKAGE
7-LEAD PLASTIC TO-220
FRONT VIEW
TAB IS
OUTPUT
NC
V
CONTROL

V
POWER

OUTPUT
SENSE
NC/GND*
ADJUST
7
6
5
4
3
2
1
θ
JA
= 50°C/ W
The ● denotes specifications which apply over the full operating
temperature range, otherwise specifications are at T
A
= 25°C. (Note 2)
PARAMETER CONDITIONS MIN TYP MAX UNITS
Output Voltage: LT1581-2.5 V
CONTROL
= 5V, V
POWER
= 3.3V, I
LOAD
= 0mA 2.485 2.500 2.515 V
V
CONTROL
= 4V to 12V, V
POWER
= 3V to 5.5V, I
LOAD
= 0mA to 4A ● 2.475 2.500 2.525 V
V
CONTROL
= 4V to 12V, V
POWER
= 3.3V to 5.5V, I
LOAD
= 0mA to 10A ● 2.475 2.500 2.525 V
Reference Voltage: LT1581 V
CONTROL
= 2.75V, V
POWER
= 2V, I
LOAD
= 10mA 1.243 1.250 1.257 V
(V
ADJ
= 0V) V
CONTROL
= 2.7V to 12V, V
POWER
= 1.75V to 5.5V, I
LOAD
= 0mA to 4A ● 1.237 1.250 1.263 V
V
CONTROL
= 2.7V to 12V, V
POWER
= 2.05V to 5.5V, I
LOAD
= 0mA to 10A ● 1.237 1.250 1.263 V
Line Regulation: LT1581-2.5 V
CONTROL
= 3.65V to 12V, V
POWER
= 3V to 5.5V, I
LOAD
= 10mA ● 13 mV
LT1581 V
CONTROL
= 2.5V to 12V, V
POWER
= 1.75V to 5.5V, I
LOAD
= 10mA ● 13 mV
Load Regulation: LT1581-2.5 V
CONTROL
= 5V, V
POWER
= 3.3V, I
LOAD
= 0mA to 10A ● 110 mV
LT1581 (V
ADJ
= 0V) V
CONTROL
= 2.75V, V
POWER
= 2.1V, I
LOAD
= 10mA to 10A ● 15 mV
Minimum Load Current: LT1581 V
CONTROL
= 5V, V
POWER
= 3.3V, V
ADJ
= 0V (Note 4) ● 310 mA
Control Pin Current: LT1581-2.5 V
CONTROL
= 5V, V
POWER
= 3.3V, I
LOAD
= 100mA ● 510 mA
(Note 5) V
CONTROL
= 5V, V
POWER
= 3.3V, I
LOAD
= 4A ● 20 50 mA
V
CONTROL
= 5V, V
POWER
= 3.3V, I
LOAD
= 7A ● 40 100 mA
V
CONTROL
= 5V, V
POWER
= 3.3V, I
LOAD
= 10A ● 70 170 mA
Control Pin Current: LT1581 V
CONTROL
= 2.75V, V
POWER
= 2.05V, I
LOAD
= 100mA ● 510 mA
(Note 5) V
CONTROL
= 2.75V, V
POWER
= 2.05V, I
LOAD
= 4A ● 20 50 mA
V
CONTROL
= 2.75V, V
POWER
= 2.05V, I
LOAD
= 7A ● 40 100 mA
V
CONTROL
= 2.75V, V
POWER
= 2.05V, I
LOAD
= 10A ● 70 170 mA
Ground Pin Current: LT1581-2.5 V
CONTROL
= 5V, V
POWER
= 3.3V, I
LOAD
= 0mA ● 610 mA
Adjust Pin Current: LT1581 (V
ADJ
= 0V) V
CONTROL
= 2.75V, V
POWER
= 2.05V, I
LOAD
= 10mA ● 60 120 µA
Current Limit: LT1581-2.5 V
CONTROL
= 5V, V
POWER
= 3.3V, ∆V
OUT
= 100mV ● 10.1 11 A
LT1581 (V
ADJ
= 0V) V
CONTROL
= 2.75V, V
POWER
= 2.05V, ∆V
OUT
= 100mV ● 10.1 11 A
Ripple Rejection: LT1581-2.5 V
CONTROL
= V
POWER
= 5V Avg, V
RIPPLE
= 1V
P-P
, f
RIPPLE
= 120Hz, 55 80 dB
I
OUT
= 4A, T
J
= 25°C
LT1581 V
CONTROL
= V
POWER
= 3.75V Avg, V
RIPPLE
= 1V
P-P
, f
RIPPLE
= 120Hz, 60 80 dB
V
ADJ
= 0V, I
OUT
= 4A, T
J
= 25°C
Thermal Regulation 30ms Pulse 0.004 0.020 %/W
Thermal Resistance, Junction-to-Case Control Circuitry/Power Transistor 0.65/2.50 °C/W