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LTC3852 Datasheet(PDF) 5 Page - Linear Technology

Part # LTC3852
Description  Low Input Voltage, Synchronous Step-Down DC/DC Controller
PDF  32 Pages
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Manufacturer  LINER [Linear Technology]
Direct Link  http://www.linear.com
Logo LINER - Linear Technology

LTC3852 Datasheet(HTML) 5 Page - Linear Technology

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LTC3852
5
3852f
TYPICAL PERFORMANCE CHARACTERISTICS
Load Step
Load Step
(Burst Mode Operation)
Load Step
(Forced Continuous Mode)
Load Step
(Pulse-Skipping Mode)
Inductor Current at Light Load
Start-Up with Prebiased Output
at 0.5V
Efficiency vs Output Current
and Mode
LOAD CURRENT (A)
0.01
40
60
80
0.1
1
10
100
3852 G02
20
0
100
CCM
PULSE-SKIPPING
Burst Mode OPERATION
FIGURE 16 CIRCUIT
ILOAD
10A/DIV
1A TO 12A
VOUT
100mV/DIV
AC-COUPLED
IL
10A/DIV
20μs/DIV
VOUT = 1.2V
VIN1 = 3.3V
FIGURE 17 CIRCUIT
3852 G05
ILOAD
10A/DIV
5A TO 15A
VOUT
100mV/DIV
AC-COUPLED
IL
10A/DIV
50μs/DIV
3852 G04
VOUT = 1.5V
VIN1 = 3.3V
FIGURE 16 CIRCUIT
ILOAD
10A/DIV
1A TO 12A
VOUT
100mV/DIV
AC-
COUPLED
IL
10A/DIV
20μs/DIV
VOUT = 1.2V
VIN1 = 3.3V
FIGURE 17 CIRCUIT
3852 G06
ILOAD
10A/DIV
1A TO 12A
VOUT
100mV/DIV
AC-
COUPLED
IL
10A/DIV
20μs/DIV
VOUT = 1.2V
VIN1 = 3.3V
FIGURE 17 CIRCUIT
3852 G07
FORCED
CONTINOUS
MODE
5A/DIV
PULSE-
SKIPPING
MODE 5A/DIV
Burst Mode
OPERATION
5A/DIV
1μs/DIV
VOUT = 1.5V
VIN2 = 3.3V
ILOAD = 500mA
FIGURE 17 CIRCUIT
3852 G08
VOUT
1V/DIV
VFB
0.5V/DIV
0V
20ms/DIV
3852 G09
TRACK/SS
0.5V/DIV
FIGURE 16 CIRCUIT
Coincident Tracking with Master
Supply
Ratiometric Tracking with Master
Supply
VMASTER
0.5V/DIV
VOUT
2A LOAD
0.5V/DIV
100ms/DIV
3852 G10
FIGURE 16 CIRCUIT
0V
VMASTER
0.5V/DIV
VOUT
2A LOAD
0.5V/DIV
10ms/DIV
3852 G11
FIGURE 16 CIRCUIT
0V



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