|
|
PDF SC2738 Data sheet ( Hoja de datos )
| Número de pieza | SC2738 | |
| Descripción | Ultra Low Output Voltage Dual Linear FET Controller | |
| Fabricantes | Semtech Corporation | |
| Logotipo |  |
|
Hay una vista previa y un enlace de descarga de SC2738 (archivo pdf) en la parte inferior de esta página. Total 13 Páginas | ||
|
No Preview Available !
POWER MANAGEMENT
Description
The SC2738 is an ultra low output voltage dual power
supply controller designed to simplify power management
for desktop PCs and graphics cards. It is part of Semtech’s
Smart LDOTM family of products. The SC2738 has two
user adjustable outputs that can be set anywhere be-
tween 0.5V and 3.3V (VIN = 12V, anywhere between 0.5V
and 1.8V for VIN = 5V) using two external resistors per
output.
SC2738 features for each output include tight output
voltage regulation (±3.5% over -40°C to +85°C), enable
controls, open drain power good signals, under-voltage
protection and soft start. The enable pins allow the part
to enter a very low power standby mode. Pulling them
high enables the outputs. The power good pins are open
drain and assert low when the voltage at their
respective adjust pins is below 88% (typ.) of nominal. If
the voltage at the adjust pin is below 50% (typ.) of
nominal, the under-voltage protection circuitry will shut
down that output. The SC2738 is available in an
MSOP-10 surface mount package.
SC2738
Ultra Low Output Voltage
Dual LinearwFwwE.DTataCShoeent4Ut.rcoomller
Features
±3.5% reference voltage
Two independant and fully adjustable outputs
Wide supply voltage range permits operation from
5V or 12V rails
Very low quiescent current (500µA typical with both
outputs enabled and 5V input)
Indivdual Enable control for each output
Individual Power Good monitoring and signalling for
each output
Gate drives from input supply enable use of
N-channel MOSFETs
User selectable dropout voltage
Individual under-voltage protection for each output
MSOP-10 surface mount package
Applications
Desktop PCs
Graphics cards
Simple dual power supplies
Typical Application Circuit
VIN1
VOUT1
C3
100uF, 25mOhm POSCAP
OUT1 Enable
OUT1 Power Good
VOUT1
=
0.5
•
1 +
R1
R2
Revision: November 16, 2004
5V or 12V IN
C1
0.1uF (1)
1
Q1
87 65
3
C2
0.1uF (1)
VIN2
VOUT2
C4
R1
11.0k
R2
10.0k
24
R5 2k (2) U1 SC2738
1
DRV1
IN
2
ADJ1 DRV2
3
EN1
ADJ2
4
PGD1 EN2
5
GND PGD2
10
9
8
7
6
C5
10nF (2)
R6 2k (2)
100uF, 25mOhm POSCAP
R3
20.0k
C6
0.1uF
C7
10nF (2)
R4
10.0k
OUT2 Enable
OUT2 Power Good
Notes:
(1) Additional capacitance may be required if far from supply
(2) Optional soft-start components
VOUT2
=
0.5 • 1+
R3
R4
1 www.semtech.com
1 page  
POWER MANAGEMENT
Block Diagram
SC2738
www.DataSheet4U.com
(0.94 VBG
at start-up)
(0.94 VBG
at start-up)
2004 Semtech Corp.
5
www.semtech.com
5 Page 
SC2738
POWER MANAGEMENT
Typical Characteristics (Cont.)
Drive Pin Output Current (Sourcing) vs.
Junction Temperature vs. Input Voltage
5.0
4.5
VIN = 12V
VEN = 5V
VADJ < VBG
4.0
3.5
3.0
2.5
2.0
1.5 VIN = 5V
1.0
0.5
0.0
-50 -25 0 25 50 75 100 125
TJ (°C)
Drive Pin Output Voltage (Full On) vs.
Junction Temperature vs. Input Voltage
8
7
VIN = 12V
6
VIN = 5V
5
4
3
2 VEN = 5V
1 IDRV = 0mA
VADJ < VBG
0
-50 -25
0
25 50
TJ (°C)
75 100 125
Power Good Threshold vs.
Junction Temperature
0.0
VIN = VEN = 5V
-2.5
-5.0
-7.5
-10.0
Startup only
-12.5
-15.0
-50
-25
Normal operation
0 25 50
TJ (°C)
75 100 125
www.DataSheet4U.com
Drive Pin Output Current (Sinking) vs.
Junction Temperature vs. Input Voltage
1200
1000
VEN = 5V
VADJ > VBG
VIN = 12V
800
VIN = 5V
600
400
200
0
-50
-25
0
25 50 75 100
TJ (°C)
Under Voltage Trip Threshold
vs. Junction Temperature
-40
-42 VIN = VEN = 5V
-44
-46
-48
-50
-52
-54
-56
-58
-60
-50
-25
0
25 50
TJ (°C)
75 100
Power Good Logic Low Output Voltage
vs. Junction Temperature
200
VIN = VEN = 5V
175 VADJ = 0.4V
IPGD = -1mA
150
125
100
75
50
25
0
-50 -25 0 25 50 75 100
TJ (°C)
125
125
125
2004 Semtech Corp.
11
www.semtech.com
11 Page | ||
| Páginas | Total 13 Páginas | |
| PDF Descargar | [ Datasheet SC2738.PDF ] | |
Hoja de datos destacado
| Número de pieza | Descripción | Fabricantes |
| SC2738 | Ultra Low Output Voltage Dual Linear FET Controller | Semtech Corporation |
| 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 |