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LTC3870 Datasheet(PDF) 5 Page - Linear Technology

Part # LTC3870
Description  PolyPhase Step-Down Slave Controller for LTC3880/LTC3883 with Digital Power System Management
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Manufacturer  LINER [Linear Technology]
Direct Link  http://www.linear.com
Logo LINER - Linear Technology

LTC3870 Datasheet(HTML) 5 Page - Linear Technology

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LTC3870
5
3870fa
For more information www.linear.com/LTC3870
Typical perForMance characTerisTics
Load Step (Discontinuous
Conduction Mode) 4-Phase
Operation LTC3880 and LTC3870
Load Step (Forced Continuous
Mode) 4-Phase Operation
LTC3880 and LTC3870
Inductor Current at Light Load
Start-Up Into a Pre-Biased
Output 4-Phase Operation
LTC3880 and LTC3870
Current Sense Threshold
vs ITH Voltage
INTVCC Line Regulation
DC Output Current Matching
Between LTC3880 and LTC3870
Dynamic Current Sharing During
a Load Transient in a 4-Phase
Operation LTC3880 and LTC3870
Quiescent Current vs Input
Voltage Without EXTVCC
VITH (V)
0
–40
60
40
20
0
–20
80
0.5
1
1.5
2
2.5
3870 G08
RANGE LOW
RANGE HIGH
INPUT VOLTAGE (V)
0
0
4
5
3
2
1
6
20
10
30
40
50
60
3870 G09
INPUT VOLTAGE (V)
0
0
2.5
3
2
1.5
1
0.5
3.5
20
10
30
40
50
60
3870 G12
1µs/DIV
IL_3870(CH0)
FORCED CONTINUOUS
MODE
5A/DIV
IL_3870(CH0)
DISCONTINUOUS
CONDUCTION MODE
5A/DIV
3870 G06
VIN = 12V
VOUT = 1.8V
ILOAD = 1A
2ms/DIV
RUN
ALL RUN PINS
TIED TOGETHER
2V/DIV
VOUT
LTC3870 IN DCM
500mV/DIV
3870 G07
VIN = 12V
VOUT = 1.8V
TOTAL OUTPUT CURRENT (A)
0
0
20
15
10
5
25
10 20 30 40 50 60 70 80 90
3870 G10
LTC3870 CH1
LTC3870 CH0
LTC3880 CH1
LTC3880 CH0
50µs/DIV
IL_3880(CH0)
IL_3880(CH1)
IL_3870(CH0)
IL_3870(CH1)
5A/DIV
3870 G11
ILOAD 0A TO 32A TO 0A
50µs/DIV
ILOAD
20A/DIV
0A TO 20A TO 0A
IL_3880(CH0)
10A/DIV
IL_3870(CH0)
10A/DIV
VOUT
100mV/DIV
AC-COUPLED
3870 G04
VIN = 12V
VOUT = 1.8V
50µs/DIV
ILOAD
20A/DIV
0A TO 20A TO 0A
IL_3880(CH0)
10A/DIV
IL_3870(CH0)
10A/DIV
VOUT
100mV/DIV
AC-COUPLED
3870 G05
VIN = 12V
VOUT = 1.8V


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