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LTC3544EUD-TR Datasheet(PDF) 3 Page - Linear Technology

Part # LTC3544EUD-TR
Description  Quad Synchronous Step-Down Regulator: 2.25MHz, 300mA, 200mA, 200mA, 100mA
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Manufacturer  LINER [Linear Technology]
Direct Link  http://www.linear.com
Logo LINER - Linear Technology

LTC3544EUD-TR Datasheet(HTML) 3 Page - Linear Technology

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LTC3544
3
3544fa
ELECTRICAL CHARACTERISTICS The denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at TA = 25°C. VIN = 3.6V unless otherwise noted.
SYMBOL
PARAMETER
CONDITIONS
MIN
TYP
MAX
UNITS
IS
Input DC Bias Current Active Mode
(Four Regulators Enabled)
VFB = 0.7V, ILOAD = 0A, 2.25MHz
825
1100
μA
Sleep Mode
(Four Regulators Enabled)
VFB = 0.9V, ILOAD = 0A, 2.25MHz
70
80
μA
Shutdown
0.1
2
μA
fOSC
Oscillator Frequency
VIN = 3V
VIN = 2.5V to 5.5V
1.8
2.25
2.7
MHz
MHz
VRUN(HIGH)
RUNx Input High Voltage
1.0
V
VRUN(LOW)
RUNx Input Low Voltage
0.3
V
ISWx
SWx Leakage
VRUN = 0V, VSW = 0V or 5.5V, VIN = 5.5V
±0.1
±1
μA
IRUNx
RUN Leakage Current
VIN = 5.5V
±0.1
±1
μA
IVFBx
VFBx Leakage Current
80
nA
tSS
Soft-Start Period
VFB = 7.5% to 92.5% Full Scale
650
875
1200
μs
VUVLO
Undervoltage Lockout
1.9
2.25
V
Individual Regulator Characteristics
Regulator SW300 – 300mA
IPK
Peak Switch Current Limit
VFB < VFBREG, Duty Cycle < 35%
400
600
800
mA
IS300
Input DC Bias Current–Reg SW300 Only
Burst Mode Operation (Sleep)
VFB = 0.9V, ILOAD = 0A, 2.25MHz
32
μA
RPFET
RDS(ON) of P-Channel FET (Note 7)
ISW = 100mA
0.55
Ω
RNFET
RDS(ON) of N-Channel FET (Note 7)
ISW = –100mA
0.50
Ω
Regulator SW200A – 200mA
IPK
Peak Switch Current Limit
VFB < VFBREG, Duty Cycle < 35%
300
400
500
mA
IS200
Input DC Bias Current–Reg SW200A Only
Burst Mode Operation (Sleep)
VFB = 0.9V, ILOAD = 0A, 2.25MHz
32
μA
RPFET
RDS(ON) of P-Channel FET (Note 7)
ISW = 100mA
0.65
Ω
RNFET
RDS(ON) of N-Channel FET (Note 7)
ISW = –100mA
0.60
Ω
Regulator SW200B – 200mA
IPK
Peak Switch Current Limit
VFB < VFBREG, Duty Cycle < 35%
300
400
500
mA
IS200
Input DC Bias Current–Reg SW200B Only
Burst Mode Operation (Sleep)
VFB = 0.9V, ILOAD = 0A, 2.25MHz
32
μA
RPFET
RDS(ON) of P-Channel FET (Note 7)
ISW = 100mA
0.65
Ω
RNFET
RDS(ON) of N-Channel FET (Note 7)
ISW = –100mA
0.60
Ω
Regulator SW100 – 100mA
IPK
Peak Switch Current Limit
VFB < VFBREG, Duty Cycle < 35%
200
300
400
mA
IS100
Input DC Bias Current–Reg SW100B Only
Burst Mode Operation (Sleep)
VFB = 0.9V, ILOAD = 0A, 2.25MHz
32
μA
RPFET
RDS(ON) of P-Channel FET (Note 7)
ISW = 100mA
0.80
Ω
RNFET
RDS(ON) of N-Channel FET (Note 7)
ISW = –100mA
0.75
Ω
Note 1: Stresses beyond those listed under Absolute Maximum Ratings
may cause permanent damage to the device. Exposure to any Absolute
Maximum Rating condition for extended periods may affect device
reliability and lifetime.
Note 2: The LTC3544E is guaranteed to meet performance specifications
from 0°C to 85°C. Specifications over the –40°C to 85°C operating
temperature range are assured by design, characterization and correlation
with statistical process controls.


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