LD1580
7 A VERY LOW DROP POSITIVE VOLTAGE REGULATOR
ADJUSTABLE AND FIXED
PRELIMINARY DATA
s
s
s
s
s
s
s
s
OUTPUT CURRENT LIMIT
LOW DROPOUT VOLTAGE: TYPICALLY
400mV AT 7A OUTPUT CURRENT
OUTPUT VOLTAGE REMOTE SENSE PIN
FAST TRANSIENT RESPONSE
THERMAL SHUTDOWN PROTECTION
WITH HYSTERESIS
WIDE OPERATING TEMPERATURE RANGE
-40°C TO 125°C
NO SUPPLY SEQUENCING PROBLEMS IN
DUAL SUPPLY MODE
OUTPUT VOLTAGES AVAILABLE 1.5 V, 1.8V,
2.5 V, 3.0 V, 3.3 V ADJUSTABLE.
HEPTAWATT
TM
PENTAWATT
TM
5
1
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
SCHEMATIC DIAGRAM
P
2
PAK
SPAK-5L
SPAK-7L
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.
November 2002
1/18
This is preliminary information on a new product now in development or undergoing evaluation. Details are subject to change without notice.
LD1580
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
ABSOLUTE MAXIMUM RATINGS
Symbol
V
POWER
I
OUT
P
D
T
stg
T
op
DC V
POWER
voltage
Output Current
Power Dissipation
Storage Temperature Range
Operating Junction Temperature Range
V
CONTROL
DC V
CONTROL
voltage
Parameter
Value
from -0.3 to 6
from -0.3 to 13
Internally Limited
Internally Limited
-55 to +150
-40 to +125
Unit
V
V
A
W
°C
°C
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 are those values beyond which damage to the device may occur. Functional operation under these condition is
not implied.
THERMAL DATA
Symbol
Parameter
PENTAWATT
TM
HEPTAWATT
TM
3
50
P
2
PAK
3
62.5
SPAK-5L
SPAK-7L
2
TBD
Unit
°C/W
°C/W
R
thj-case
Thermal Resistance Junction-case
R
thj-amb
Thermal Resistance Junction-ambient
CONNECTION DIAGRAM
(top view)
HEPTAWATT
TM
PENTAWATT
TM
P
2
PAK
SPAK-5L
SPAK-7L
2/18
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