2
LT1587-1.5
V
IN
............................................................................. 7V
Operating Junction Temperature Range
Control Section.................................... 0°C to 125°C
Power Transistor ................................. 0°C to 150°C
ABSOLUTE MAXIMUM RATINGS
W
WW
U
Storage Temperature Range ................. –65°C to 150°C
Lead Temperature (Soldering, 10 sec).................. 300°C
100% Thermal Limit Functional Test
PRECONDITIONI G
UUU
PACKAGE/ORDER INFORMATION
W
U
U
ORDER PART
NUMBER
T PACKAGE
3-LEAD PLASTIC TO-220
FRONT VIEW
3
2
1
V
IN
V
OUT
GND
ORDER PART
NUMBER
V
IN
V
OUT
GND
M PACKAGE
3-LEAD PLASTIC DD
FRONT VIEW
3
2
1
θ
JA
= 30°C/W*
LT1587CM-1.5
* With package soldered to 0.5 square inch copper area over backside
ground plane or internal power plane. θ
JA
can vary from 20°C/W to
>40°C/W with other mounting techniques.
Consult factory for Industrial and Military grade parts.
The ● denotes specifications which apply over the specified operating
temperature range.
Note 1: See thermal regulation specifications for changes in output voltage
due to heating effects. Load and line regulation are measured at a constant
junction temperature by low duty cycle pulse testing.
Note 2: Line and load regulation are guaranteed up to the maximum
power dissipation (17W for the LT1587-1.5 in T package). Power
dissipation is determined by input/output differential and the output
current. Guaranteed maximum output power will not be available over
the full input/output voltage range.
Note 3: I
FULL LOAD
is defined as the maximum value of output load current
as a function of input-to-output voltage. I
FULL LOAD
is equal to 3A. The
LT1587-1.5 has constant current limit with changes in input-to-output
voltage.
PARAMETER CONDITIONS MIN TYP MAX UNITS
Output Voltage V
IN
= 5V, T
J
= 25°C, I
OUT
= 0mA 1.485 (–1%) 1.5 1.515 (+1%) V
3V ≤ V
IN
≤ 7V, 0mA ≤ I
OUT
≤ 3A ● 1.470 (–2%) 1.5 1.530 (+2%) V
Line Regulation (Notes 1, 2) 3V ≤ V
IN
≤ 7V, I
OUT
= 0mA 0.005 0.2 %
Load Regulation V
IN
= 5V, T
J
= 25°C, 0mA ≤ I
OUT
≤ I
FULL LOAD
0.05 0.3 %
(Notes 1, 2, 3)
● 0.05 0.5 %
Dropout Voltage ∆V
OUT
= 1%, I
OUT
= 3A ● 1.150 1.300 V
Current Limit (Note 3) (V
IN
– V
OUT
) = 5.5V ● 3.100 3.750 A
Quiescent Current V
IN
= 5V ● 713 mA
Ripple Rejection f = 120Hz, C
OUT
= 25µF Tant., V
IN
= 4.5V, I
OUT
= 3A ● 60 72 dB
Thermal Regulation T
A
= 25°C, 30ms pulse 0.004 0.02 %/W
Temperature Stability ● 0.5 %
Long-Term Stability T
A
= 125°C, 1000 Hrs. 0.03 1.0 %
RMS Output Noise T
A
= 25°C, 10Hz ≤ f ≤ 10kHz 0.003 %
(% of V
OUT
)
Thermal Resistance T Package: Control Circuitry/Power Transistor 0.7/3.0 °C/W
Junction to Case M Package: Control Circuitry/Power Transistor 0.7/3.0 °C/W
ELECTRICAL CHARACTERISTICS
θ
JA
= 50°C/W
LT1587CT-1.5
