LTC3115-1
TYPICAL PERFORMANCE CHARACTERISTICS
(T
A
= 25°C unless otherwise specified)
Die Temperature Rise vs Load
Current, V
OUT
= 12V, f
SW
= 750kHz
DIE TEMPERATURE CHANGE FROM AMBIENT (°C)
80
70
60
50
40
30
20
10
0
0
0.5
STANDARD DEMO PCB
L = 15µH MSS1048
1
1.5
LOAD CURRENT (A)
2
31151 G51
Load Transient (0A to 1A),
V
IN
= 24V, V
OUT
= 5V
LOAD
CURRENT
(1A/DIV)
V
OUT
(200mV/DIV)
INDUCTOR
CURRENT
(1A/DIV)
FRONT PAGE
APPLICATION
200µs/DIV
31151 G39
Load Transient (0A to 1A),
V
IN
= 3.6V, V
OUT
= 5V
LOAD
CURRENT
(1A/DIV)
V
OUT
(200mV/DIV)
INDUCTOR
CURRENT
(2A/DIV)
FRONT PAGE
APPLICATION
200µs/DIV
V
IN
= 36V
V
IN
= 24V
V
IN
= 12V
V
IN
= 6V
31151 G40
Output Voltage Ripple in
Burst Mode Operation,
V
IN
= 24V, V
OUT
= 5V
V
OUT
(50mV/DIV)
V
RUN
(5V/DIV)
V
CC
(2V/DIV)
V
OUT
(2V/DIV)
INDUCTOR
CURRENT
(1A/DIV)
Soft-Start Waveforms
INDUCTOR
CURRENT
(100mA/DIV)
Output Voltage Ripple in PWM
Mode, V
IN
= 24V, V
OUT
= 5V
INDUCTOR
CURRENT
(0.5A/DIV)
L = 15µH
C
OUT
= 22µF
I
LOAD
= 25mA
20µs/DIV
31151 G41
V
OUT
(5mV/DIV)
FRONT PAGE
APPLICATION
2ms/DIV
31151 G42
L = 22µH
C
OUT
= 22µF
I
LOAD
= 2A
f
SW
= 750kHz
1µs/DIV
31151 G43
Burst Mode Operation to PWM
Mode Output Voltage Transient
V
PWM/SYNC
(5V/DIV)
V
OUT
(200mV/DIV)
INDUCTOR
CURRENT
(1A/DIV)
FRONT PAGE
APPLICATION
500µs/DIV
31151 G44
Phase-Locked Loop Acquisition,
V
IN
= 24V 1.2MHz Clock
V
PWM/SYNC
(5V/DIV)
V
OUT
(200mV/DIV)
INDUCTOR
CURRENT
(1A/DIV)
FRONT PAGE
APPLICATION
50µs/DIV
31151 G45
Phase-Locked Loop Release,
V
IN
= 24V, 1.2MHz Clock
V
PWM/SYNC
(5V/DIV)
V
OUT
(200mV/DIV)
INDUCTOR
CURRENT
(1A/DIV)
FRONT PAGE
APPLICATION
50µs/DIV
31151 G46
31151f
9
LINEAR [ LINEAR INTEGRATED SYSTEMS ]
