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SC1454 PDF даташит

Спецификация SC1454 изготовлена ​​​​«Semtech Corporation» и имеет функцию, называемую «Dual 150mA Ultra Low Dropout/ Low Noise Regulator».

Детали детали

Номер произв SC1454
Описание Dual 150mA Ultra Low Dropout/ Low Noise Regulator
Производители Semtech Corporation
логотип Semtech Corporation логотип 

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SC1454 Даташит, Описание, Даташиты
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
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SC1454 Даташит, Описание, Даташиты
SC1454
POWER MANAGEMENT
Absolute Maximum Ratings
Parameter
Symbol
Maximum
Input Supply Voltage
Enable Input Voltage
Operating Ambient Temperature Range
Operating Junction Temperature Range
Storage Temperature Range
Thermal Impedance Junction to Ambient(1)
Thermal Impedance Junction to Ambient(2)
Thermal Impedance Junction to Case
ESD Rating (Human Body Model)
VIN
VEN
TA
TJ
TSTG
qJA
qJA
qJC
ESD
-5 to +7
-5 to +VIN
-40 to +85
-40 to +125
-60 to +150
206
95
39
2
NOTES:
(1) Minimum pad size.
(2) 1 square inch of FR-4, double sided, 1oz. minimum copper weight.
Electrical Characteristics
Unless specified: TA = 25°C, VIN = VOUT + 1V, IOUTA = IOUTB = 1mA, CIN = COUT = 1.0 µF, VENA = VENB = VIN.
Values in bold apply over full operating temperature range.
Parameter
Symbol
Conditions
Min
IN
Input Supply Voltage
Quiescent Current
VIN 2.25
IQ VENA = 0V, VENB = VIN, IOUTB = 150mA or
VENB = 0V, VENA = VIN, IOUTA = 150mA
VENA = VENB = VIN, IOUTA = IOUTB = 150mA
VIN = 6.5V, VENA = VENB = 0V (OFF)
OUTA, OUTB
Output Voltage(1)
Line Regulation(1)
VOUT
REG(LINE)
IOUT = 1mA
0mA £ IOUT £ 150mA, VOUT + 1V £ VIN £ 5.5V
VOUT + 1V £ VIN £ 5.5V, IOUT = 1mA
-1%
-2%
Load Regulation(1)
REG(LOAD)
0.1mA £ IOUT £ 150mA
Typ
100
130
0.2
VOUT
2.5
-5
Units
V
V
°C
°C
°C
°C/W
°C/W
°C/W
kV
Max Units
6.50 V
150 µA
200
200 µA
250
1.0 µA
1.5
+1%
+2%
10
12
-20
-30
V
mV
mV
ã 2000 Semtech Corp.
2
www.semtech.com









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SC1454 Даташит, Описание, Даташиты
SC1454
POWER MANAGEMENT
Electrical Characteristics
Unless specified: TA = 25°C, VIN = VOUT + 1V, IOUTA = IOUTB = 1mA, CIN = COUT = 1.0 µF, VENA = VENB = VIN.
Values in bold apply over full operating temperature range.
Parameter
Symbol
Conditions
Min Typ Max Units
OUTA, OUTB (Cont.)
Dropout Voltage(1)(2)
VD
IOUT = 1mA
IOUT = 50mA
1 mV
52 70
90
IOUT = 150mA
155 210
270
Current Limit
Ripple Rejection
Output Voltage Noise
ENA, ENB
ILIM
PSRR
en
f = 120Hz, CBYP = 10nF
f = 10Hz to 100kHz, IOUT =50mA,
CBYP = 10nF, COUT = 2.2µF
f = 10Hz to 1MHz, IOUT =50mA,
CBYP = 10nF, COUT = 2.2µF
400
60
50
55
mA
dB
µVRMS
Enable Input Threshold
Enable Input Bias Current(3)
BYP
VIH
VIL
IEN
0V £ VENA/B £ VIN
1.6 V
0.4
-0.5 0.5 µA
Start-Up Rise Time
SETA
tr
CBYP = 10nF
1.25 ms
Sense/Select Threshold
SETA Reference Voltage
VTH
VSETA
SETA Input Leakage Current(3)
Over Temperature Protection
ISETA
VIN = 2.5V, IOUT = 1mA
0mA £ IOUT £ 150mA, 2.5V £ VIN £ 5.5V
VSETA = 1.3V
20 40 80
-1% 1.250 +1%
-2% +2%
0.015 50
mV
V
nA
High Trip Level
THI
150 °C
Hysteresis
THYST
20 °C
NOTES:
(1) Low duty cycle pulse testing with Kelvin connections required.
(2) Defined as the input to output differential at which the output drops 100mV below the value measured at a
differential of 1V. Not measurable on 1.5V and 1.8V outputs due to minimum VIN constraints.
(3) Guaranteed by design.
ã 2000 Semtech Corp.
3
www.semtech.com










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