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PDF SC1454XIMSTR Data sheet ( Hoja de datos )

Número de pieza SC1454XIMSTR
Descripción Dual 150mA Ultra Low Dropout/ Low Noise Regulator
Fabricantes Semtech Corporation 
Logotipo Semtech Corporation Logotipo



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SC1454
Dual 150mA Ultra Low
Dropout, Low Noise Regulator
POWER MANAGEMENT
Description
Features
The SC1454 contains two ultra low dropout voltage
regulators (ULDOs). It operates from an input voltage
range of 2.25V to 6.5V, and a wide variety of output
voltage options are available. One ULDO has a fixed
output, and the other is either fixed (SETA pin grounded)
or adjustable using external resistors. Each ULDO has an
independent enable pin.
The SC1454 has a bypass pin to enable the user to
capacitively decouple the bandgap reference for very low
output noise (50µVRMS typically).
Designed specifically for battery operated systems, the
devices utilize CMOS technology to require very low
operating currents (typically 130µA with both outputs
supplying 150mA). In addition, the dropout voltage is
typically 155mV at 150mA, helping to prolong battery
life further. The devices are designed to provide 400mA
of peak current for applications which require high initial
inrush current.
They have been designed to be used with low ESR
ceramic capacitors to save cost and PCB area.
u Up to 150mA per regulator output
u Low quiescent current
u Low dropout voltage
u Stable operation with ceramic caps
u Very low 50µVRMS output noise
u Wide selection of output voltages
u Tight load and line regulation
u Current and thermal limiting
u Reverse input polarity protection
u <1.5uA off-mode current
u Logic controlled enable
Applications
u Cellular telephones
u Palmtop/Laptop computers
u Battery-powered equipment
u Bar code scanners
u SMPS post regulator/dc to dc modules
u High efficiency linear power supplies
The SC1454 is available with a wide variety of voltage
options as standard. It comes in the tiny 8 lead MSOP
surface mount package.
Typical Application Circuit
OUTPUT A: 3.0V
OUTPUT B: 3.0V
C1 C2
1uF 1uF
U1 SC1454DIMS
1
OUTA
IN
2 OUTB
ENA
3
GND
BYP
4 SETA
ENB
8
7
6
5
C3
10nF
VIN
ENABLE OUTPUT A
ENABLE OUTPUT B
C4
1uF
OUTPUT A: 2.5V
OUTPUT B: 2.8V
R1
100k
R2
100k
C1 C2
1uF 1uF
U1 SC1454CIMS
1
OUTA
IN
2 OUTB
ENA
3 GND
BYP
4
SETA
ENB
8
7
6
5
VIN
ENABLE OUTPUT A
ENABLE OUTPUT B
C3
10nF
C4
1uF
Revision 1, November 2000
1
www.semtech.com

1 page




SC1454XIMSTR pdf
POWER MANAGEMENT
Block Diagram
SC1454
Marking Information
ã 2000 Semtech Corp.
# = Voltage option (Example: 454F)
yyww = Datecode (Example: 0008)
XXXX = Lot number (Example: E90101-1)
5 www.semtech.com

5 Page





SC1454XIMSTR arduino
SC1454
POWER MANAGEMENT
Typical Characteristics (Cont.)
Output Spectral Noise Density vs. Frequency
vs. Output Capacitance
10000
1000
100
VIN = 2.8V
VOUT = 1.8V
10
IOUT = 50mA
CIN = 1µF
CBYP = 10nF
TA = 25°C
1
1.E+01
1.E+02
1.E+03
1.E+04
f (Hz)
Evaluation Board Schematic
COUT = 2.2µF
COUT = 10µF
1.E+05
1.E+06
J6
OUTA
J7
OUTB
J4
RIPPLE A
12345
J5
RIPPLE B
12345
1
2
R2
3
C1 C2
R4
U1 SC1454xIMS
1
OUTA
IN
2
OUTB
ENA
3
GND
BYP
4
SETA
ENB
8
7
6
5
JP3
1
2
IQ MON
J1
ENA
J2
ENB
JP1
1 ON
2
3 OFF
OUTA ENABLE
J3
VIN
JP2
1 ON
2
3 OFF
OUTB ENABLE
R1
C3 C4
R3
+ C5
220uF
JP4
EXT
1
2
INT 3
OUTA SET
R5 R6
J8
OUTB LOAD DRV
U2
8
7D
6D
5D
D
1
S2
S3
S4
G
Si4410
JP5
EN
1
2
3 OFF
OUTB LOAD
U3
8
7D
6D
5D
D
1
S2
S3
S4
G
Si4410
J9
OUTA LOAD DRV
JP6
EN
1
2
3 OFF
OUTA LOAD
J10 J11 J12 J13 J14 J15
GND GND GND GND GND GND
ã 2000 Semtech Corp.
11
www.semtech.com

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