Page 1
7 A very low drop positive voltage regulator adjustable
Features
■ Output current limit
■ Low dropout voltage: typically 400 mV at 7 A
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: adjustable
Description
The LD1580 is a very low dropout positive linear
voltage regulator particularly suitable in
applications requiring output currents up to 7 A.
LD1580XX
P²PAK
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.
The LD1580 typical dropout voltage is 400 mV at
7 A while it decreases at lighter loads.
This very low dropout is achieved thanks to a
second input voltage pin, named VCONTROL,
which is also responsible 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.
The ADJ pin is still available. A small capacitor on
this pin helps to improve transient response.
The LD1580 also features a built-in output current
limit function and a thermal shutdown protection
with hysteresis which prevents from excessive
Table 1. Device summary
Part number Order code Packaging
LD1580XX LD1580P2T-R tape and reel
April 2008 Rev 5 1/15
www.st.com
15
Page 2
Contents LD1580XX
Contents
1 Diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
2 Pin configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
3 Maximum ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
4 Typical application . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
5 Electrical characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
6 Typical characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
7 Package mechanical data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
8 Revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
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Page 3
LD1580XX Diagram
1 Diagram
Figure 1. Schematic diagram
3/15
Page 4
Pin configuration LD1580XX
2 Pin configuration
Figure 2. Pin connections (top view)
4/15
Page 5
LD1580XX Maximum ratings
3 Maximum ratings
Table 2. Absolute maximum ratings
Symbol Parameter Value Unit
V
POWER
V
CONTROL
I
OUT
P
T
STG
T
OP
D
DC V
DC V
voltage from -0.3 to 6 V
POWER
CONTROL
voltage from -0.3 to 13 V
Output current Internally limited
Power dissipation Internally limited
Storage temperature range -55 to +150 °C
Operating junction temperature range -40 to +125 °C
Note: Absolute maximum ratings are those values beyond which damage to the device may occur.
Functional operation under these condition is not implied.
Table 3. Thermal data
Symbol Parameter P²PAK Un it
R
R
thJC
thJA
Thermal resistance junction-case 3 °C/W
Thermal resistance junction-ambient 62.5 °C/W
5/15
Page 6
Typical application LD1580XX
4 Typical application
Figure 3. Typical application circuits
R
2
VOV
⎛⎞
1
⋅=
REF
⎝⎠
------ -+
R
1
6/15
Page 7
LD1580XX Electrical characteristics
5 Electrical characteristics
Table 4. Electrical characteristics for LD1580 (TJ= - 40 °C to 125 °C, CP = 330 µF, CC = 10 µF,
= 100 µF, unless otherwise specified)
C
OUT
Symbol Parameter Test conditions Min. Typ. Max. Unit
V
Output voltage
O
ΔV
ΔV
I
I
Line regulation
O
Load regulation
O
I
V
C
CONTROL
Adjust pin current
ADJ
Output current limit V
OUT
pin current
SVR Supply voltage rejection
V
V
T
SHDN
T
1. Measured when the V
2. Measured when the V
Minimum V
DC
voltage, (V
Minimum V
DP
(V
POWER-VO
Shutdown temperature
threshold
Thermal shutdown
HYST
hysteresis
CONTROL
CONTROL-VO
POWER
)
voltage drops below 100 mV with respect to its nominal value.
OUT
voltage drops below 2 % with respect to its nominal value.
OUT
)
voltage
V
CONTROL
TJ=25 °C, I
V
CONTROL
V
POWER
V
CONTROL
V
POWER
V
CONTROL
I
OUT
V
CONTROL
I
OUT
V
CONTROL
I
OUT
V
CONTROL
I
OUT
V
CONTROL
I
OUT
V
CONTROL
I
OUT
CONTROL
V
CONTROL=VPOWER
V
RIPPLE
V
POWER
V
POWER
V
POWER
V
POWER
V
CONTROL
CONTROL
V
CONTROL
=2.75 V, V
=10 mA
OUT
=2.7 V to 12 V
=2.05 V to 5.5 V, I
=2.5 V to 12 V
=1.75 V to 5.5 V, I
=2.75 V, V
=0.01 to 7 A
=2.75 V, V
=100 mA
=2.75 V, V
=4 A
=2.75 V, V
=4 A
=2.75 V, V
=7 A
=2.75 V, V
=10 mA
=2.75 V, V
=1 V
P-P
=2.05 V, I
=2.05 V, I
=2.05 V, I
=2.05 V, I
=2.75 V, I
=2.75 V, I
=2.75 V, I
=2 V
POWER
=0.01 to 7A
OUT
=10 mA
OUT
=2.1 V
POWER
=2.05 V
POWER
=2.05 V
POWER
=1.75 V
POWER
=2.05 V
POWER
=2.05 V
POWER
=2.05 V
POWER
=3.75 V Avg
, I
=4 A, TJ=25 °C
OUT
=100 mA
OUT
=1 A 0.95 1.15
OUT
=4 A 1 1.2
OUT
=7 A 1.05 1.3
OUT
=1 A
OUT
=4 A 0.2 0.4
OUT
=7 A 0.4 0.6
OUT
(2)
(2)
1.237 1.250 1.263
1.225 1.250 1.275
(1)
89 A
61.5 81.5 dB
V
0.08 0.24 %
0.08 0.4 %
610
30 60
mA
33 70
60 120
50 120 µA
0.95 1.15
V
0.05 0.15
VV
170 °C
5°C
7/15
Page 8
Typical characteristics LD1580XX
6 Typical characteristics
(unless otherwise specified TJ = 25 °C, CP = 330 µF, CC = 10 µF, C
Figure 4. Output voltage vs temperature Figure 5. Minimum V
Figure 6. Minimum V
current
voltage vs output
POWER
Figure 7. Output voltage vs temperature
temperature
= 100 µF)
OUT
CONTROL
voltage vs
Figure 8. V
CONTROL
pin current vs temp. Figure 9. Minimum V
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voltage vs temp.
POWER
Page 9
LD1580XX Typical characteristics
Figure 10. V
CONTROL
current
pin current vs output
Figure 11. Output current limit vs temperature
Figure 12. Quiescent current vs temperature Figure 13. Supply voltage rejection vs output
current
Figure 14. Line transient response Figure 15. Line transient response
V
POWER
=3.3V, V
CONTROL
=5 to 7V, I
OUT
=1A
V
POWER=VCONTROL
=5 to 7V, I
OUT
=1A
9/15
Page 10
Typical characteristics LD1580XX
Figure 16. Load transient response Figure 17. Load transient response
V
POWER=VCONTROL
Figure 18. Load transient response
V
POWER=VCONTROL
=5V
=5V
V
POWER=VCONTROL
=5V
10/15
Page 11
LD1580XX Package mechanical data
7 Package mechanical data
In order to meet environmental requirements, ST offers these devices in ECOPACK®
packages. These packages have a lead-free second level interconnect. The category of
second Level Interconnect is marked on the package and on the inner box label, in
compliance with JEDEC Standard JESD97. The maximum ratings related to soldering
conditions are also marked on the inner box label. ECOPACK is an ST trademark.
ECOPACK specifications are available at: www.st.com.
11/15
Page 12
Package mechanical data LD1580XX
P2PAK mechanical data
Dim.
Min. Typ. Max. Min. Typ. Max.
A4.304.80 0.169 0.188
A1 2.40 2.80 0.094 0.110
A2 0.03 0.23 0.001 0.009
b 0.80 1.05 0.031 0.041
c 0.45 0.60 0.017 0.023
c2 1.17 1.37 0.046 0.053
D 8.95 9.350.352 0.368
D2 8 0.315
E 10.00 10.40 0.393 0.409
E1 8.5 0.334 0.409
e 3.20 3.60 0.126 0.142
e1 6.60 7.00 0.260 0.275
L13.70 14.50 0.539 0.571
L2 1.25 1.40 0.049 0.055
L3 0.90 1.70 0.035 0.067
L5 1.55 2.40 0.061 0.094
R 0.40 0.016
V2 0° 8°0° 8°
mm. inch.
12/15
7226255/B
Page 13
LD1580XX Package mechanical data
Tape & reel D2PAK-P2PAK-D2PAK/A-P2PAK/A mechanical data
Dim.
Min. Typ. Max. Min. Typ. Max.
A180 7.086
C 12.8 13.0 13.2 0.504 0.512 0.519
D 20.2 0.795
N60 2.362
T 14.4 0.567
Ao 10.50 10.6 10.70 0.413 0.417 0.421
Bo 15.70 15.80 15.90 0.618 0.622 0.626
Ko 4.804.90 5.00 0.189 0.193 0.197
Po 3.9 4.0 4.1 0.153 0.157 0.161
P 11.9 12.0 12.1 0.468 0.472 0.476
mm. inch.
13/15
Page 14
Revision history LD1580XX
8 Revision history
Table 5. Document revision history
Date Revision Changes
08-Sep-2005 3 Order codes updated.
09-May-2007 4 Order codes updated.
16-Apr-2008 5 Modified: Table 1 on page 1.
14/15
Page 15
LD1580XX
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