1/18
November 2002
s
OUTPUT CURRENT LIMIT
s
LOW DROPOUT VOLTAGE: TYPICALLY
400mV AT 7A OUTPUT CURRENT
s
OUTPUT VOLTAGE REMOTE SENSE PIN
s
FAST TRANSIENT RESPONSE
s
THERMAL SHUTDOWN PROTECTION
WITH HYSTERESIS
s
WIDE OPERATING TEMPERATURE RANGE
-40C TO 125C
s
NO SUPPLY SEQUENCING PROBLEMS IN
DUAL SUPPLY MODE
s
OUTPUT VOLTAGES AVAILABLE 1.5 V, 1.8V,
2.5 V, 3.0 V, 3.3 V ADJUSTABLE.
DESCRIPTION
The LD1580 is a very low dropout positive linear
voltage
regulator
particularly
suitable
in
applications requiring output currents up to 7 A.
The LD1580 typical dropout voltage is 400mV at
7A
while
it
decreases
at
lighter loads.
This very low dropout is achieved thanks to a
second input voltage pin, named V
CONTROL
,
which is also responsable of the output power
stage driving.
The LD1580 is provided with an output voltage
remote sense pin which reduces dramatically any
output voltage variations that could occur due to
load changes.
On fixed voltage devices, the ADJ pin is still
available. A small capacitor on this pin helps to
improve transient response.
LD1580
7 A VERY LOW DROP POSITIVE VOLTAGE REGULATOR
ADJUSTABLE AND FIXED
This is preliminary information on a new product now in development or undergoing evaluation. Details are subject to change without notice.
SCHEMATIC DIAGRAM
HEPTAWATT
TM
PENTAWATT
TM
P
2
PAK
1
5
SPAK-5L
SPAK-7L
PRELIMINARY DATA
LD1580
2/18
The LD1580 also features a built-in output current
limit function and a thermal shutdown protection
with hysteresis which
prevents from excessive
power
dissipation
in
case
of
insufficient
heatsinking. On chip trimming allows the regulator
to reach a very tight output voltage tolerance,
within 2% at the maximum output current and
over the full temperature range.
ABSOLUTE MAXIMUM RATINGS
Absolute Maximum Ratings are those values beyond which damage to the device may occur. Functional operation under these condition is
not implied.
THERMAL DATA
CONNECTION DIAGRAM (top view)
Symbol
Parameter
Value
Unit
V
POWER
DC V
POWER
voltage
from -0.3 to 6
V
V
CONTROL
DC V
CONTROL
voltage
from -0.3 to 13
V
I
OUT
Output Current
Internally Limited
A
P
D
Power Dissipation
Internally Limited
W
T
stg
Storage Temperature Range
-55 to +150
C
T
op
Operating Junction Temperature Range
-40 to +125
C
Symbol
Parameter
PENTAWATT
TM
HEPTAWATT
TM
P
2
PAK
SPAK-5L
SPAK-7L
Unit
R
thj-case
Thermal Resistance Junction-case
3
3
2
C/W
R
thj-amb
Thermal Resistance Junction-ambient
50
62.5
TBD
C/W
HEPTAWATT
TM
PENTAWATT
TM
P
2
PAK
SPAK-5L
SPAK-7L
LD1580
3/18
ORDERING CODES
(*) Available in Tape & Reel with the suffix "R" for fixed version and "-R" for adjustable version.
TYPICAL APPLICATION CIRCUITS FOR FIXED VERSION
TYPICAL APPLICATION CIRCUITS FOR ADJUSTABLE VERSION
P
2
PAK (*)
PENTAWATT
SPAK-5L (*)
SPAK-7L (*)
HEPTAWATT
OUTPUT VOLTAGE
LD1580K7-15
LD1580V7V15
1.5V
LD1580K7-18
LD1580V7V18
1.8V
LD1580K7-25
LD1580V7V25
2.5V
LD1580K7-30
LD1580V7V30
3.0V
LD1580K7-33
LD1580V7V33
3.3V
LD1580P2T
LD1580V5V
LD1580K5
Adjustable
R
2
V
O
= V
REF
(1 +
)
R
1
LD1580
4/18
ELECTRICAL CHARACTERISTICS FOR LD1580xx15 ( T
j
= -40 C to 125 C, C
P
=330 F, C
C
=10 F,
C
OUT
=100 F, unless otherwise specified)
Symbol
Parameter
Test Conditions
Min.
Typ.
Max.
Unit
V
O
Output Voltage
V
CONTROL
=4 V, V
POWER
=2.3 V
T
j
=25 C, I
OUT
=0 mA
1.485
1.5
1.515
V
V
CONTROL
=3 V to 12 V
V
POWER
=2.1 V to 5.5 V
I
OUT
=0 to 7 A
1.470
1.5
1.530
V
O
Line Regulation
V
CONTROL
=2.65 V to 12 V
V
POWER
=2 V to 5.5 V
I
OUT
=10 mA
0.08
0.24
%
V
O
Load Regulation
V
CONTROL
=4 V, V
POWER
=2.3 V
I
OUT
=0 to 7 A
0.08
0.4
%
I
C
V
CONTROL
Pin Current
V
CONTROL
=4 V, V
POWER
=2.3 V
I
OUT
=100 mA
6
10
mA
V
CONTROL
=4 V, V
POWER
=2.3 V
I
OUT
=4 A
30
60
V
CONTROL
=4 V, V
POWER
=2 V
I
OUT
=4 A
33
70
V
CONTROL
=4 V, V
POWER
=2.3 V
I
OUT
=7 A
60
120
I
Q
Quiescent Current
V
CONTROL
=4 V, V
POWER
=2.3 V
I
OUT
=0 A
5
10
mA
I
OUT
Output Current Limit
V
CONTROL
=4 V, V
POWER
=2.3 V
(Note
1)
8
9
A
SVR
Supply Voltage Rejection
V
CONTROL
=V
POWER
=4 V Avg,
V
RIPPLE
=1 V
P-P
I
OUT
=4 A, T
j
=25 C
60
80
dB
V
DC
Minimun V
CONTROL
Voltage
(V
CONTROL
-V
O
)
V
POWER
=2.3 V, I
OUT
=100 mA
(Note 2)
0.95
1.15
V
V
POWER
=2.3 V, I
OUT
=1 A
0.95
1.15
V
POWER
=2.3 V, I
OUT
=4 A
1
1.2
V
POWER
=2.3 V, I
OUT
=7 A
1.05
1.3
V
DP
Minimun V
POWER
Voltage
(V
POWER
-V
O
)
V
CONTROL
=4 V, I
OUT
=1 A
(Note 2)
0.05
0.15
V
V
CONTROL
=4 V, I
OUT
=4 A
0.2
0.4
V
CONTROL
=4 V, I
OUT
=7 A
0.4
0.6
T
SHDN
Shutdown Temperature
Threshold
170
C
T
HYST
Thermal Shutdown
Hysteresis
5
C
LD1580
5/18
ELECTRICAL CHARACTERISTICS FOR LD1580xx18 ( T
j
= -40 C to 125 C, C
P
=330 F, C
C
=10 F,
C
OUT
=100 F, unless otherwise specified)
Symbol
Parameter
Test Conditions
Min.
Typ.
Max.
Unit
V
O
Output Voltage
V
CONTROL
=4 V, V
POWER
=2.6 V
T
j
=25 C, I
OUT
=0 mA
1.782
1.8
1.818
V
V
CONTROL
=3.3 V to 12 V
V
POWER
=2.4 V to 5.5 V
I
OUT
=0 to 7 A
1.764
1.8
1.836
V
O
Line Regulation
V
CONTROL
=2.95 V to 12 V
V
POWER
=2.3 V to 5.5 V
I
OUT
=10 mA
0.08
0.24
%
V
O
Load Regulation
V
CONTROL
=4.3 V, V
POWER
=2.6 V
I
OUT
=0 to 7 A
0.08
0.4
%
I
C
V
CONTROL
Pin Current
V
CONTROL
=4.3 V, V
POWER
=2.6 V
I
OUT
=100 mA
6
10
mA
V
CONTROL
=4.3 V, V
POWER
=2.6 V
I
OUT
=4 A
30
60
V
CONTROL
=4.3 V, V
POWER
=2.3 V
I
OUT
=4 A
33
70
V
CONTROL
=4.3 V, V
POWER
=2.6 V
I
OUT
=7 A
60
120
I
Q
Quiescent Current
V
CONTROL
=4.3 V, V
POWER
=2.6 V
I
OUT
=0 A
5
10
mA
I
OUT
Output Current Limit
V
CONTROL
=4.3 V, V
POWER
=2.6 V
(Note
1)
8
9
A
SVR
Supply Voltage Rejection
V
CONTROL
=V
POWER
=4.3 V Avg,
V
RIPPLE
=1 V
P-P
I
OUT
=4 A, T
j
=25 C
58.4
78.4
dB
V
DC
Minimun V
CONTROL
Voltage
(V
CONTROL
-V
O
)
V
POWER
=2.6 V, I
OUT
=100 mA
(Note 2)
0.95
1.15
V
V
POWER
=2.6 V, I
OUT
=1 A
0.95
1.15
V
POWER
=2.6 V, I
OUT
=4 A
1
1.2
V
POWER
=2.6 V, I
OUT
=7 A
1.05
1.3
V
DP
Minimun V
POWER
Voltage
(V
POWER
-V
O
)
V
CONTROL
=4.3 V, I
OUT
=1 A
(Note 2)
0.05
0.15
V
V
CONTROL
=4.3 V, I
OUT
=4 A
0.2
0.4
V
CONTROL
=4.3 V, I
OUT
=7 A
0.4
0.6
T
SHDN
Shutdown Temperature
Threshold
170
C
T
HYST
Thermal Shutdown
Hysteresis
5
C
PDF 
ZIP