2
LT1585-1.5/LT1585A-1.5
PACKAGE/ORDER INFORMATION
W
U
U
ABSOLUTE MAXIMUM RATINGS
W
WW
U
V
IN
............................................................................ 7V
Operating Junction Temperature Range
Control Section .................................. 0°C to 125°C
Power Transistor ................................ 0°C to 150°C
PRECONDITIONI G
UUU
100% Thermal Limit Functional Test
T PACKAGE
3-LEAD PLASTIC TO-220
FRONT VIEW
3
2
1
TAB IS
OUTPUT
V
IN
V
OUT
GND
θ
JA
= 50°C/W
LT1585CT-1.5
LT1585ACT-1.5
ORDER PART
NUMBER
Consult factory for Industrial and Military grade parts.
LT1585CM-1.5
LT1585ACM-1.5
ORDER PART
NUMBER
V
IN
V
OUT
GND
M PACKAGE
3-LEAD PLASTIC DD
FRONT VIEW
TAB
IS
OUTPUT
3
2
1
θ
JA
= 30°C/W*
PARAMETER CONDITIONS MIN TYP MAX UNITS
Output Voltage (Note 4) 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
≤ I
FULL LOAD
● 1.470 (–2%) 1.5 1.530 (+2%) V
Line Regulation (Notes 2, 3) 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 2, 3, 4) ● 0.05 0.5 %
Dropout Voltage (Note 4) ∆V
OUT
= 1%, I
OUT
= I
FULL LOAD
● 1.200 1.400 V
Current Limit LT1585-1.5, (V
IN
– V
OUT
) = 5.5V ● 4.60 5.25 A
LT1585A-1.5, (V
IN
– V
OUT
) = 5.5V ● 5.00 6.00 A
Quiescent Current V
IN
= 5V ● 713 mA
Ripple Rejection (Note 4) f = 120Hz, C
OUT
= 25µF Tant., V
IN
= 4.5V, I
OUT
= I
FULL LOAD
● 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
Note 1: Absolute Maximum Ratings are those values beyond which the life
of the device may be impaired.
Note 2: 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 3: Line and load regulation are guaranteed up to the maximum
power dissipation (25W for the LT1585-1.5 in T package and 27.5W for
the LT1585A-1.5). 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 4: 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 4.6A for the
LT1585-1.5 and 5A for the LT1585A-1.5. The LT1585-1.5/LT1585A-1.5
have constant current limit with changes in input-to-output voltage.
*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
The ● denotes specifications which apply over the specified operating
temperature range, otherwise specifications are at T
A
= 25°C.
(Note 1)
Storage Temperature Range ................ –65°C to 150°C
Lead Temperature (Soldering, 10 sec)................. 300°C
