LTC3835 Linear Technology, LTC3835 Datasheet - Page 5

• Manufacturer Part Number: LTC3835
• Description: Low IQ Synchronous Step-Down Controller
• Manufacturer: Linear Technology

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SKIPPING
COUPLED
TYPICAL PERFORMANCE CHARACTERISTICS
CONTIN-
FORCED
100mV/
PULSE-
DIV AC
2A/DIV
2A/DIV
BURST
MODE
MODE
MODE
UOUS
V
100
OUT
90
80
70
60
40
20
10
50
30
0.001
I
0
L
Effi ciency and Power Loss
vs Output Current
FIGURE 11 CIRCUIT
Load Step
(Burst Mode Operation)
FIGURE 11 CIRCUIT
V
Inductor Current at Light Load
FIGURE 11 CIRCUIT
V
I
LOAD
V
V
OUT
OUT
IN
OUT
0.01
= 12V
= 3.3V
= 3.3V
= 300μA
= 3.3V
Burst Mode OPERATION
FORCED CONTINUOUS MODE
PULSE SKIPPING MODE
0.1
LOAD CURRENT (mA)
20μs/DIV
4μs/DIV
1
10
100 1000 10000
3835 G04
3835 G07
3835 G01
10000
1000
100
10
1
0.1
100mV/DIV
COUPLED
2A/DIV
V
OUT
100
AC
90
80
70
60
50
40
0.001
I
L
Effi ciency vs Load Current
FIGURE 11 CIRCUIT
Load Step
(Forced Continuous Mode)
FIGURE 11 CIRCUIT
V
Soft Start-Up
FIGURE 11 CIRCUIT
OUT
0.01
= 3.3V
V
V
V
IN
IN
OUT
= 12V
= 5V
0.1
LOAD CURRENT (mA)
= 3.3V
20ms/DIV
20μs/DIV
1
10
100 1000 10000
1V/DIV
T
V
A
3835 G05
3835 G08
OUT
= 25ºC, unless otherwise noted.
3835 G02
100mV/DIV
COUPLED
2A/DIV
V
OUT
AC
96
94
92
90
86
82
98
88
84
I
L
0
Effi ciency vs Input Voltage
FIGURE 11 CIRCUIT
Load Step
(Pulse-Skipping Mode)
FIGURE 11 CIRCUIT
V
Tracking Start-Up
FIGURE 11 CIRCUIT
OUT
V
OUT
5
= 3.3V
= 3.3V
10
INPUT VOLTAGE (V)
15
20ms/DIV
20μs/DIV
LTC3835
20
2V/DIV (MASTER)
25
30
(SLAVE)
2V/DIV
V
V
35
OUT2
OUT1
3835 G06
3835 G09
3835fc
5
3835 G03
40