ltc3834-1 Linear Technology Corporation, ltc3834-1 Datasheet - Page 4

• Manufacturer Part Number: ltc3834-1
• Description: 30?a Iq Synchronous Step-down Controller
• Manufacturer: Linear Technology Corporation

LTC3834-1
TYPICAL PERFOR A CE CHARACTERISTICS
CONTINUOUS
4
100mV/DIV
COUPLED
OPERATION
Burst Mode
100
0.000001
SKIPPING
90
80
70
60
50
40
30
20
10
2A/DIV
0
FORCED
V
2A/DIV
PULSE
Efficiency and Power Loss vs
Output Current
MODE
MODE
OUT
AC
V
V
IL
IN
OUT
Load Step (Burst Mode Operation)
V
FIGURE 10 CIRCUIT
= 12V
OUT
Burst Mode OPERATION
FORCED CONTINUOUS MODE
PULSE SKIPPING MODE
V
I
FIGURE 10 CIRCUIT
Inductor Current at Light Load
= 3.3V
LOAD
OUT
0.0001
= 3.3V
OUTPUT CURRENT (A)
= 3.3V
= 100μA
FIGURE 10 CIRCUIT
20μs/DIV
0.01
2μs/DIV
W
1
38341 G01
U
38341 G04
10000
1000
100
10
0.1
38341 G07
1
100mV/DIV
COUPLED
2A/DIV
V
100
0.000001
OUT
AC
90
80
70
60
40
50
IL
Efficiency vs Load Current
Load Step (Forced Continuous
Mode)
V
FIGURE 10 CIRCUIT
Soft Start-Up
FIGURE 10 CIRCUIT
OUT
V
OUT
= 3.3V
V
V
= 3.3V
0.0001
IN
IN
OUTPUT CURRENT (A)
= 12V
= 5V
20μs/DIV
20ms/DIV
FIGURE 10 CIRCUIT
0.01
1V/DIV
V
T
OUT
A
1
38341 G05
= 25ºC, unless otherwise noted.
38341 G08
38341 G02
100mV/DIV
COUPLED
2A/DIV
V
OUT
AC
98
96
94
92
88
86
84
80
90
82
IL
Tracking Start-Up
Efficiency vs Input Voltage
FIGURE 10 CIRCUIT
0
Load Step (Pulse Skipping Mode)
V
FIGURE 10 CIRCUIT
OUT
V
FIGURE 10 CIRCUIT
OUT
5
= 3.3V
= 3.3V
10
INPUT VOLTAGE (V)
15
20ms/DIV
20μs/DIV
20
25
MASTER
2V/DIV
2V/DIV
30
V
OUT
38341 G09
35
38341 G06
38341 G03
38341f
40