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PDF LD1085 Data sheet ( Hoja de datos )
| Número de pieza | LD1085 | |
| Descripción | 3A low drop positive voltage regulator | |
| Fabricantes | ST Microelectronics | |
| Logotipo |  |
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LD1085
3 A low drop positive voltage regulator: adjustable and fixed
TO-220
TO-220FP
Datasheet - production data
Unlike PNP regulators, where a part of the output
current is wasted as quiescent current, the
LD1085 quiescent current flows into the load,
thus increase efficiency. Only a 10 µF minimum
capacitor is need for stability.
The device is supplied in TO-220, TO-220FP,
D²PAK and D²PAK/A packages. On-chip trimming
allows the regulator to reach a very tight output
voltage tolerance, within ± 1% at 25 °C.
D²PAK
D²PAK/A
Features
• Typical dropout 1.3 V (at 3 A)
• Three terminal adjustable or fixed output
voltage 1.8 V, 2.5 V, 3.3 V, 5 V
• Guaranteed output current up to 3 A
• Output tolerance ± 1% at 25 °C and ± 2% in full
temperature range
• Internal power and thermal limit
• Wide operating temperature range -40 °C to
125 °C
• Package available: TO-220, TO-220FP,
D²PAK, D²PAK/A
• Pinout compatibility with standard adjustable
VREG
Description
The LD1085 is a low drop voltage regulator able
to provide up to 3 A of output current. Dropout is
guaranteed at a maximum of 1.2 V at the
maximum output current, decreasing at lower
loads. The LD1085 is pin-to-pin compatible with
the older 3-terminal adjustable regulators, but
offers better performance in terms of drop and
output tolerance.
October 2013
This is information on a product in full production.
DocID6738 Rev 27
1/27
www.st.com
27
1 page  
LD1085
3 Maximum ratings
Maximum ratings
Symbol
VI
IO
PD
TSTG
TOP
Table 1. Absolute maximum ratings
Parameter
DC input voltage
Output current
Power dissipation
Storage temperature range
Operating junction temperature range
Value
30
Internally limited
Internally limited
-55 to +150
-40 to +125
Unit
V
mA
mW
°C
°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 2. Thermal data
Symbol
Parameter
TO-220
RthJC
RthJA
Thermal resistance junction-case
Thermal resistance junction-ambient
3
50
TO-220FP
5
60
D²PAK
D²PAK/A
3
62.5
Unit
°C/W
°C/W
DocID6738 Rev 27
5/27
5 Page 
LD1085
Electrical characteristics
VI = 4.25 V, CI = CO =10 µF, TA = -40 to 125 °C, unless otherwise specified.
Table 7. Electrical characteristics of LD1085#
Symbol
Parameter
Test condition
Min. Typ. Max. Unit
Vref Reference voltage (1)
ΔVO Line regulation
ΔVO Load regulation
Vd Dropout voltage
IO(min) Minimum load current
Isc Short-circuit current
Thermal regulation
SVR Supply voltage rejection
IADJ
ΔIADJ
eN
S
Adjust pin current
Adjust pin current change (1)
RMS output noise voltage (%
of VO)
Temperature stability
IO = 10 mA TJ = 25°C
IO = 10 mA to 3 A, VI = 2.85 to 30 V
IO = 10 mA, VI = 2.85 to 16.5 V,
TJ = 25°C
IO = 10 mA, VI = 2.85 to 16.5 V
IO = 10 mA to 3 A, TJ = 25°C
IO = 0 to 3 A
IO = 3 A
VI = 30 V
VI - VO = 5 V
VI - VO = 25 V
TA = 25°C, 30ms pulse
f = 120 Hz, CO = 25 µF,CADJ = 25 µF,
IO = 3 A, VI = 6.25 ± 3 V
VI = 4.25 V, IO = 10 mA
IO = 10 mA to 3 A, VI = 2.85 to 16.5 V
1.237
1.225
5.5
0.5
60
TA = 25°C, f =10 Hz to 10 kHz
S Long term stability
TA = 125°C, 1000 Hrs
1. See short-circuit current curve for available output current at fixed dropout.
1.25 1.263
1.25 1.275
0.015 0.2
0.035 0.2
0.1 0.3
0.2 0.4
1.3 1.5
3 10
6.5
0.7
0.003 0.015
72
55 120
0.2 5
0.003
0.5
0.5
V
V
%
%
%
%
V
mA
A
A
%/W
dB
µA
µA
%
%
%
DocID6738 Rev 27
11/27
11 Page | ||
| Páginas | Total 27 Páginas | |
| PDF Descargar | [ Datasheet LD1085.PDF ] | |
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