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LTC3621 Datasheet(PDF) 4 Page - Analog Devices

Part # LTC3621
Description  Quad 17V, 1.25A Parallelable Synchronous Step-Down Regulator with Ultralow Quiescent Current
PDF  20 Pages
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Manufacturer  AD [Analog Devices]
Direct Link  http://www.analog.com
Logo AD - Analog Devices

LTC3621 Datasheet(HTML) 4 Page - Analog Devices

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LTC3644/LTC3644-2
4
Rev. 0
For more information www.analog.com
TYPICAL PERFORMANCE CHARACTERISTICS
Phase Shift with External Clock
Frequency Sync
180° Phase Operation
IQ vs Temperature
SW Leakage Current vs
Temperature
RDS(ON) vs Temperature
Efficiency vs Load Current in
Burst Mode Operation
TA = 25°C, unless otherwise noted.
VIN = 12V
VOUT = 5V
fSW = 1MHz
1.25A OUTPUT, L = 4.7µH
2.50A OUTPUT, L = 2.2µH
3.75A OUTPUT, L = 1.8µH
LOAD CURRENT (A)
0.001
0.01
0.1
1
10
0
10
20
30
40
50
60
70
80
90
100
3644 G01
VIN = 12V
VOUT1 = 3.3V, VOUT4 = 1.8V
L1 = 4.7µH, L4 = 3.3µH
PHASE = INTVCC
MODE/SYNC = EXT CLK
500ns/DIV
SW4
10V/DIV
SW1
10V/DIV
EXT CLK
5V/DIV
3644 G04
VIN = 12V
VOUT1 = 3.3V, VOUT4 = 1.8V
L1 = 4.7µH, L4 = 3.3µH
PHASE = INTVCC
MODE/SYNC = 2.5V
500ns/DIV
SW4
10V/DIV
SW1
10V/DIV
3644 G05
SVIN = 17V
IQ, SHUTDOWN
IQ, SLEEP
TEMPERATURE (°C)
–50 –25
0
25
50
75
100 125
0
3
6
9
12
15
3644 G06
PMOS
NMOS
TEMPERATURE (°C)
–50 –25
0
25
50
75
100 125
0
1
2
3
4
5
6
7
3644 G07
VDS = 17V
PMOS
NMOS
TEMPERATURE (°C)
–50 –25
0
25
50
75
100 125
0
100
200
300
400
500
3644 G08
Efficiency vs Load Current in
Burst Mode Operation
Efficiency vs Load Current in
Burst Mode Operation
VIN = 12V
fSW = 2.25MHz
VOUT = 5.0V, L = 2.2µH
VOUT = 3.3V, L = 1.8µH
VOUT = 2.5V, L = 1.2µH
LOAD CURRENT (A)
0.001
0.01
0.1
1
10
0
10
20
30
40
50
60
70
80
90
100
3644 G02
VIN = 12V
VOUT = 5V
fSW = 2.25MHz
1.25A OUTPUT, L = 2.2µH
2.50A OUTPUT, L = 1.2µH
3.75A OUTPUT, L = 0.86µH
LOAD CURRENT (A)
0.001
0.01
0.1
1
10
0
10
20
30
40
50
60
70
80
90
100
3644 G03



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