|
|
PDF 1528C Data sheet ( Hoja de datos )
| Número de pieza | 1528C | |
| Descripción | LT1528C | |
| Fabricantes | Linear Technology | |
| Logotipo |  |
|
Hay una vista previa y un enlace de descarga de 1528C (archivo pdf) en la parte inferior de esta página. Total 12 Páginas | ||
|
No Preview Available !
LT1528
3A Low Dropout Regulator
for Microprocessor Applications
FEATURES
n Dropout Voltage: 0.6V at IOUT = 3A
n Fast Transient Response
n Output Current: 3A
n Quiescent Current: 400μA
n No Protection Diodes Needed
n Fixed Output Voltage: 3.3V
n Controlled Quiescent Current in Dropout
n Shutdown IQ = 125μA
n Stable with 3.3μF Output Capacitor
n Reverse Battery Protection
n No Reverse Output Current
n Thermal Limiting
APPLICATIONS
n Microprocessor Applications
n Post Regulator for Switching Supplies
n 5V to 3.3V Logic Regulator
DESCRIPTION
The LT ®1528 is a 3A low dropout regulator optimized to
handle the large load current transients associated with
the current generation of microprocessors. This device has
the fastest transient response of currently available PNP
regulators and is very tolerant of variations in capacitor
ESR. Dropout voltage is 75mV at 10mA, rising to 300mV
at 1A and 600mV at 3A. The device has a quiescent cur-
rent of 400μA. Quiescent current is well controlled; it does
not increase significantly as the device enters dropout.
The regulator can operate with output capacitors as small
as 3.3μF, although larger capacitors will be needed to
achieve the performance required in most microprocessor
applications. The LT1528 is available with a fixed output
voltage of 3.3V. An external SENSE pin allows adjustment
to output voltages greater than 3.3V, using a simple resis-
tive divider. This allows the device to be adjusted over a
wide range of output voltages, including the 3.3V to 4.2V
range required by a variety of processors from Intel, IBM,
AMD, and Cyrix.
The LT1528 has both reverse input and reverse output
protection and includes a shutdown feature. Quiescent
current drops to 125μA in shutdown. The LT1528 is avail-
able in 5-lead TO-220 and 5-lead DD-PAK packages.
L, LT, LTC and LTM are registered trademarks of Linear Technology Corporation. All other
trademarks are the property of their respective owners.
TYPICAL APPLICATION
Microprocessor Supply with Shutdown
5 IN
OUT 1
VIN =5V
LT1528
4 SHDN
SENSE 2
GND
3
VOUT
15Ω 68Ω + 4 × 47μF*
SOLID TANTALUM
J1 J2
J3
330Ω
VSHDN (PIN 4)
<0.25
>2.80
NC
OUTPUT
OFF
ON
ON
SHORTING
J1
J2
J3
VOUT
3.30
3.45
4.00
*CHOOSE CAPACITORS
TO MEET PROCESSOR
REQUIREMENTS
1528 TA01
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 (mA)
1528 TA02
1528fb
1
1 page  
TYPICAL PERFORMANCE CHARACTERISTICS
SHDN Pin Threshold
(Off-to-On)
2.0
1.8
1.6 ILOAD = 3A
1.4
1.2
ILOAD = 1mA
1.0
0.8
0.6
0.4
0.2
0
–50 –25
0 25 50 75 100 125
TEMPERATURE (°C)
1528 TPC10
SHDN Pin Current
100
VSHDN = 0V
90
80
70
60
50
40
30
20
10
0
–50 –25
0 25 50 75
TEMPERATURE (°C)
100 125
1528 TPC11
SENSE Pin Current
200
CURRENT FLOWS INTO SENSE PIN
175
150
125
100
75
50
25
0
–50 –25
0 25 50 75
TEMPERATURE (°C)
100 125
1528 TPC13
Reverse Output Current
300
VIN = 0V
VOUT = VSENSE
250
200
150
100
50
0
–50 –25
0 25 50 75
TEMPERATURE (°C)
100 125
1528 TPC14
Current Limit
6
5
4
3
2
1
VIN = 7V
VOUT = 0V
0
–50 –25 0
25 50
75
TEMPERATURE (°C)
100 125
1528 TPC16
Reverse Output Current
1000
900
800
700
TJ = 25°C, VIN = 0V
VOUT =VSENSE
CURRENT FLOWS
INTO DEVICE
600
500
400
300
200
100
0
0 1 2 3 4 5 6 7 8 9 10
OUTPUT VOLTAGE (V)
1528 TPC17
LT1528
SHDN Pin Input Current
25
20
15
10
5
0
01 2 3 4 5 6 7 8 9
SHDN PIN VOLTAGE (V)
1528 TPC12
Current Limit
6
VOUT = 0V
5
4
3
2
1
0
01
2 34 5
INPUT VOLTAGE (V)
67
1528 TPC15
Ripple Rejection
70
VIN(AVG) = 4.3V
68
VRIPPLE = 0.5VP-P AT f = 120Hz
IL = 1.5A
66
64
62
60
58
56
–50 –25
0 25 50 75
TEMPERATURE (°C)
100 125
1528 TPC18
1528fb
5
5 Page 
PACKAGE DESCRIPTION
LT1528
.060
(1.524)
.256
(6.502)
.060
(1.524)
.183
(4.648)
Q Package
5-Lead Plastic DD Pak
(Reference LTC DWG # 05-08-1461)
.060
(1.524)
TYP
.390 – .415
(9.906 – 10.541)
15° TYP
.330 – .370
(8.382 – 9.398)
.165 – .180
(4.191 – 4.572)
.059
(1.499)
TYP
.075
(1.905)
.300
(7.620)
BOTTOM VIEW OF DD PAK
HATCHED AREA IS SOLDER PLATED
COPPER HEAT SINK
.143
+.012
–.020
( )3.632
+0.305
–0.508
.067
(1.702)
.028 – .038 BSC
(0.711 – 0.965)
TYP
.013 – .023
(0.330 – 0.584)
.045 – .055
(1.143 – 1.397)
.004
+.008
–.004
( )0.102
+
–
0.203
0.102
.095 – .115
(2.413 – 2.921)
.050 ± .012
(1.270 ± 0.305)
Q(DD5) 0502
.420
.080
.420 .276
.350
.565
.090
.067 .042
RECOMMENDED SOLDER PAD LAYOUT
NOTE:
1. DIMENSIONS IN INCH/(MILLIMETER)
2. DRAWING NOT TO SCALE
.325
.205
.565
.320
.090
.067 .042
RECOMMENDED SOLDER PAD LAYOUT
FOR THICKER SOLDER PASTE APPLICATIONS
Information furnished by Linear Technology Corporation is believed to be accurate and reliable.
However, no responsibilit y is assumed for its use. Linear Technology Corporation makes no representa-
tion that the interconnection of its circuits as described herein will not infringe on existing patent rights.
1528fb
11
11 Page | ||
| Páginas | Total 12 Páginas | |
| PDF Descargar | [ Datasheet 1528C.PDF ] | |
Hoja de datos destacado
| Número de pieza | Descripción | Fabricantes |
| 1528-6 | RF & MICROWAVE TRANSISTORS AVIONICS APPLICATIONS |  STMicroelectronics |
| 1528-8 | RF & MICROWAVE TRANSISTORS AVIONICS APPLICATIONS | STMicroelectronics |
| 1528C | LT1528C | Linear Technology |
| Número de pieza | Descripción | Fabricantes |
| SLA6805M | High Voltage 3 phase Motor Driver IC. |
 Sanken |
| SDC1742 | 12- and 14-Bit Hybrid Synchro / Resolver-to-Digital Converters. |
 Analog Devices |
|
DataSheet.es es una pagina web que funciona como un repositorio de manuales o hoja de datos de muchos de los productos más populares, |
| DataSheet.es | 2020 | Privacy Policy | Contacto | Buscar |