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LTC3883 Datasheet(PDF) 4 Page - Linear Technology

Part # LTC3883
Description  PolyPhase Step-Down Slave Controller for Digital Power System Management
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Manufacturer  LINER [Linear Technology]
Direct Link  http://www.linear.com
Logo LINER - Linear Technology

LTC3883 Datasheet(HTML) 4 Page - Linear Technology

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LTC3870-1
4
38701f
For more information www.linear.com/LTC3870-1
Typical perForMance characTerisTics
Load Step (Discontinuous Conduction
Mode) 4-Phase Operation
LTC3887-1 and LTC3870-1
Load Step (Forced Continuous
Mode) 4-Phase Operation
LTC3887-1 and LTC3870-1
Inductor Current at Light Load
Efficiency vs Load Current
Efficiency vs Load Current
Full Load (ILOAD = 20A/Phase)
Efficiency and Power Loss vs
Input Voltage
VIN = 12V
VOUT = 1.8V
L = 0.56µH
DCR = 1.61mΩ
fSW = 350kHz
CCM
DCM
LOAD CURRENT (A)
0.1
1
10
100
10
25
40
55
70
85
100
3874 G01
VIN = 12V
VOUT = 3.3V
fSW = 350kHz
L = 1µH
DCR = 2.4mΩ
CCM
DCM
LOAD CURRENT (A)
0.1
1
10
100
10
20
30
40
50
60
70
80
90
100
38701 G02
VOUT = 1.8V
L = 0.56µH
DCR = 1.61mΩ
EFFICIENCY
POWER LOSS
INPUT VOLTAGE (V)
5 6 7 8 9 10 11 11 12 13 14 15 16
91.0
91.5
92.0
92.5
93.0
93.5
2.5
2.6
2.7
2.8
2.9
3.0
38701 G03
VIN = 12V
VOUT = 1.0V
50µs/DIV
ILOAD
50A/DIV
0A TO 20A TO 0A
VOUT
50mV/DIV
AC–COUPLED
INDUCTOR CURRENT
LTC3887–1 (CH0)
10A/DIV
INDUCTOR CURRENT
LTC3870–1 (CH0)
10A/DIV
38701 G04
VIN = 12V
VOUT = 1.0V
50µs/DIV
ILOAD
50A/DIV
0A TO 20A TO 0A
VOUT
50mV/DIV
AC–COUPLED
INDUCTOR CURRENT
LTC3887–1 (CH0)
10A/DIV
INDUCTOR CURRENT
LTC3870–1 (CH0)
10A/DIV
38701 G05
1µs/DIV
IL
LTC3870–1 (CH1)
FORCED
CONTINUOUS
MODE
5A/DIV
IL
LTC3870–1 (CH1)
DISCONTINUOUS
MODE
5A/DIV
38701 G06


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