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PDF LT1529IQ Data sheet ( Hoja de datos )
| Número de pieza | LT1529IQ | |
| Descripción | 3A Low Dropout Regulators with Micropower Quiescent Current and Shutdown | |
| Fabricantes | Linear Technology | |
| Logotipo |  |
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FEATURES
s Dropout Voltage: 0.6V at IOUT = 3A
s Output Current: 3A
s Quiescent Current: 50µA
s No Protection Diodes Needed
s Adjustable Output from 3.8V to 14V
s 3.3V and 5V Fixed Output Voltages
s Controlled Quiescent Current in Dropout
s Shutdown IQ = 16µA
s Stable with 3.3µF Output Capacitor
s Reverse Battery Protection
s No Reverse Current
s Thermal Limiting
U
APPLICATIO S
s High Efficiency Regulator
s Regulator for Battery-Powered Systems
s Post Regulator for Switching Supplies
s 5V to 3.3V Logic Regulator
TYPICAL APPLICATIO
5V Supply with Shutdown
VIN > 5.5V
51
VIN OUTPUT
LT1529-5
42
SHDN SENSE
GND
3
5V
+ 3.3µF 3A
SOLID
TANT
VSHDN (PIN 4)
< 0.25
> 2.8
NC
OUTPUT
OFF
ON
ON
LT1529 • TA01
LT1529
LT 1529-3.3/LT 1529-5
3A Low Dropout Regulators
with Micropower
Quiescent Current
and Shutdown
DESCRIPTIO
The LT®1529/LT1529-3.3/LT1529-5 are 3A low dropout
regulators with micropower quiescent current and shut-
down. The devices are capable of supplying 3A of output
current with a dropout voltage of 0.6V. Designed for use
in battery-powered systems, the low quiescent current,
50µA operating and 16µA in shutdown, make them an
ideal choice. The quiescent current is well controlled; it
does not rise in dropout as it does with many other low
dropout PNP regulators.
Other features of the LT1529 /LT1529-3.3/LT1529-5 in-
clude the ability to operate with small output capacitors.
They are stable with only 3.3µF on the output while most
older devices require between 10µF and 100µF for stabil-
ity. Small ceramic capacitors can be used, enhancing
manufacturabiltiy. Also the input may be connected to
voltages lower than the output voltage, including negative
voltages, without reverse current flow from output to
input. This makes the LT1529/LT1529-3.3/LT1529-5 ideal
for backup power situations where the output is held high
and the input is at ground or reversed. Under these
conditions, only 16µA will flow from the OUTPUT pin to
ground. The devices are available in 5-lead TO-220 and
5-lead DD packages.
, LTC and LT are registered trademarks of Linear Technology Corporation.
Dropout Voltage
0.6
0.5
0.4
0.3
0.2
0.1
0
0 0.5 1.0 1.5 2.0 2.5 3.0
OUTPUT CURRENT (A)
LT1529 • TA02
1
1 page  
LT1529
LT 1529-3.3/LT 1529-5
TYPICAL PERFOR A CE CHARACTERISTICS
LT1529-3.3
GND Pin Current
5.0
TJ = 25°C
4.5 VOUT = VSENSE
4.0 *FOR VOUT = 3.3V
3.5
RLOAD = 6.6Ω
ILOAD = 500mA*
3.0
RLOAD = 330Ω
2.5 ILOAD = 10mA*
2.0 RLOAD = 11Ω
1.5 ILOAD = 300mA*
1.0
RLOAD = 33Ω
ILOAD = 100mA*
0.5
0
0 1 2 3 4 5 6 7 8 9 10
INPUT VOLTAGE (V)
LT1529 • G10
LT1529-3.3
GND Pin Current
100
TJ = 25°C *FOR VOUT = 3.3V
90 VOUT = VSENSE
80 RLOAD = 1.1Ω
ILOAD = 3A*
70
60
50
40
RLOAD = 4.7Ω
ILOAD = 700mA*
30 RLOAD = 2.2Ω
20 ILOAD = 1.5A*
10
0
0 1 2 3 4 5 6 7 8 9 10
INPUT VOLTAGE (V)
LT1529 • G13
GND Pin Current
100
VIN = 3.75V (LT1529)
90 VIN = 3.3V (LT1529-3.3)
80
VIN = 5V (LT1529-5)
DEVICE IS OPERATING
70 IN DROPOUT
60 TJ = 25°C
50
40 TJ = 125°C
TJ = – 50°C
30
20
10
0
0 0.5 1.0 1.5 2.0 2.5 3.0
OUTPUT CURRENT (A)
LT1529 • G16
LT1529-5
GND Pin Current
5.0
TJ = 25°C
4.5 VOUT = VSENSE
4.0 *FOR VOUT = 5V
3.5
3.0 RLOAD = 500Ω
ILOAD = 10mA*
2.5
RLOAD = 10Ω
ILOAD = 500mA*
2.0 RLOAD = 16.6Ω
1.5 ILOAD = 300mA*
1.0 RLOAD = 50Ω
0.5 ILOAD = 100mA*
0
0 1 2 3 4 5 6 7 8 9 10
INPUT VOLTAGE (V)
LT1529 • G11
LT1529-5
GND Pin Current
100
TJ = 25°C
90 VOUT = VSENSE
80 *FOR VOUT = 5V
RLOAD = 1.7Ω
ILOAD = 3A*
70
60 RLOAD = 7.1Ω
ILOAD = 700mA*
50
40
30 RLOAD = 3.3Ω
20 ILOAD = 1.5A*
10
0
0 1 2 3 4 5 6 7 8 9 10
INPUT VOLTAGE (V)
LT1529 • G14
SHDN Pin Threshold
(On-to-Off)
2.0
1.8 ILOAD = 1mA
1.6
1.4
1.2
1.0
0.8
0.6
0.4
0.2
0
– 50 –25
0 25 50 75
TEMPERATURE (°C)
100 125
LT1529 • G17
LT1529
GND Pin Current
5.0
TJ = 25°C
4.5 VOUT = VADJ
4.0
*FOR VOUT =
3.75V
3.5
3.0
2.5
2.0
RLOAD = 7.5Ω
ILOAD = 500mA*
RLOAD = 375Ω
ILOAD = 10mA*
RLOAD = 12.5Ω
ILOAD = 300mA*
1.5
1.0
RLOAD = 38Ω
ILOAD = 100mA*
0.5
0
0 1 2 3 4 5 6 7 8 9 10
INPUT VOLTAGE (V)
LT1529 • G12
LT1529
GND Pin Current
100
TJ = 25°C
90 VOUT = VADJ
80 *FOR VOUT = 3.75V
70
RLOAD = 1.25Ω
ILOAD = 3A*
60
50
40
RLOAD = 5.3Ω
ILOAD = 700mA*
30 RLOAD = 2.5Ω
20 ILOAD = 1.5A*
10
0
0 1 2 3 4 5 6 7 8 9 10
INPUT VOLTAGE (V)
LT1529 • G15
SHDN Pin Threshold
(Off-to-On)
2.0
1.8
ILOAD = 3A
1.6
1.4
1.2
ILOAD = 1mA
1.0
0.8
0.6
0.4
0.2
0
–50 –25
0 25 50 75
TEMPERATURE (°C)
100 125
LT1529 • G18
5
5 Page 
LT1529
LT 1529-3.3/LT 1529-5
APPLICATI S I FOR ATIO
In some applications it may be necessary to leave the input
to the LT1529 unconnected when the output is held high.
This can happen when the LT1529 is powered from a
rectified AC source. If the AC source is removed, then the
input of the LT1529 is effectively left floating. The reverse
output current also follows the curve in Figure 3 if the VIN
pin is left open. The state of the SHDN pin will have no
effect on the reverse output current when the VIN pin is
floating.
When the input of the LT1529 is forced to a voltage below
its nominal output voltage and its output is held high, the
output current will follow the curve shown in Figure 3 . This
can happen if the input of the LT1529 is connected to a
discharged (low voltage) battery and the output is held up
by either a backup battery or by a second regulator circuit.
When the VIN pin is forced below the OUTPUT pin or the
OUTPUT pin is pulled above the VIN pin, the input current
will typically drop to less than 2µA (see Figure 4). The state
of the SHDN pin will have no effect on the reverse output
current when the output is pulled above the input.
5
VOUT = 3.3V (LT1529-3.3)
VOUT = 5V (LT1529-5)
4
LT1529-3.3
3
LT1529-5
2
1
0
01 2 345
INPUT VOLTAGE (V)
LT1529 • F04
Figure 4. Input Current
U
PACKAGE DESCRIPTIO Dimensions in inches (millimeters) unless otherwise noted.
0.256
(6.502)
0.060
(1.524)
0.060
(1.524)
0.183
(4.648)
0.075
(1.905)
0.300
(7.620)
BOTTOM VIEW OF DD PAK
HATCHED AREA IS SOLDER PLATED
COPPER HEAT SINK
Q Package
5-Lead Plastic DD Pak
(LTC DWG # 05-08-1461)
0.060
(1.524)
TYP
0.330 – 0.370
(8.382 – 9.398)
0.143
+0.012
–0.020
( )3.632
+0.305
–0.508
0.390 – 0.415
(9.906 – 10.541)
15° TYP
0.165 – 0.180
(4.191 – 4.572)
0.059
(1.499)
TYP
0.057 – 0.077
(1.447 – 1.955)
0.028 – 0.038
(0.711 – 0.965)
0.013 – 0.023
(0.330 – 0.584)
0.045 – 0.055
(1.143 – 1.397)
0.004
+0.008
–0.004
( )0.102
+0.203
–0.102
0.095 – 0.115
(2.413 – 2.921)
0.050 ± 0.012
(1.270 ± 0.305)
Q(DD5) 0396
Information furnished by Linear Technology Corporation is believed to be accurate and reliable.
However, no responsibility is assumed for its use. Linear Technology Corporation makes no represen-
tation that the interconnection of circuits as described herein will not infringe on existing patent rights.
11
11 Page | ||
| Páginas | Total 12 Páginas | |
| PDF Descargar | [ Datasheet LT1529IQ.PDF ] | |
Hoja de datos destacado
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| LT1529IQ | 3A Low Dropout Regulators with Micropower Quiescent Current and Shutdown | Linear Technology |
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| LT1529IQ-5 | 3A Low Dropout Regulators with Micropower Quiescent Current and Shutdown | Linear Technology |
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