Datasheet

LTC3115-2
9
31152f
For more information www.linear.com/LTC3115-2
Typical perForMance characTerisTics
Die Temperature Rise vs Load
Current, V
OUT
= 12V, f
SW
= 750kHz
Load Transient (0A to 1A),
V
IN
= 24V, V
OUT
= 5V
Load Transient (0A to 0.8A),
V
IN
= 3.6V, V
OUT
= 5V
Output Voltage Ripple in
Burst Mode Operation,
V
IN
= 24V, V
OUT
= 5V
(T
A
= 25°C unless otherwise specified)
Phase-Locked Loop Acquisition,
V
IN
= 24V 1.2MHz Clock
Phase-Locked Loop Release,
V
IN
= 24V, 1.2MHz Clock
Soft-Start Waveforms
Burst Mode Operation to PWM
Mode Output Voltage Transient
Output Voltage Ripple in PWM
Mode, V
IN
= 24V, V
OUT
= 5V
V
OUT
(200mV/DIV)
LOAD
CURRENT
(1A/DIV)
FRONT PAGE
APPLICATION
500µs/DIV
31152 G39
INDUCTOR
CURRENT
(1A/DIV)
V
OUT
(200mV/DIV)
LOAD
CURRENT
(1A/DIV)
FRONT PAGE
APPLICATION
500µs/DIV
31152 G40
INDUCTOR
CURRENT
(2A/DIV)
V
OUT
(50mV/DIV)
L = 15µH
C
OUT
= 22µF
I
LOAD
= 25mA
20µs/DIV
31152 G41
INDUCTOR
CURRENT
(0.5A/DIV)
V
OUT
(5mV/DIV)
L = 22µH
C
OUT
= 22µF
I
LOAD
= 2A
f
SW
= 750kHz
1µs/DIV
31152 G43
INDUCTOR
CURRENT
(100mA/DIV)
V
PWM/SYNC
(5V/DIV)
V
OUT
(200mV/DIV)
FRONT PAGE
APPLICATION
50µs/DIV
31152 G45
INDUCTOR
CURRENT
(1A/DIV)
V
PWM/SYNC
(5V/DIV)
V
OUT
(200mV/DIV)
FRONT PAGE
APPLICATION
50µs/DIV
31152 G46
INDUCTOR
CURRENT
(1A/DIV)
V
OUT
(2V/DIV)
V
RUN
(5V/DIV)
V
CC
(2V/DIV)
FRONT PAGE
APPLICATION
2ms/DIV
31152 G42
INDUCTOR
CURRENT
(1A/DIV)
V
OUT
(200mV/DIV)
V
PWM/SYNC
(5V/DIV)
FRONT PAGE
APPLICATION
500µs/DIV
31152 G44
INDUCTOR
CURRENT
(1A/DIV)
LOAD CURRENT (A)
0
0
DIE TEMPERATURE CHANGE FROM AMBIENT (°C)
10
20
30
50
70
80
40
60
0.5 1 1.5 2
31152 G51
V
IN
= 36V
V
IN
= 24V
V
IN
= 12V
V
IN
= 6V
STANDARD DEMO PCB
L = 15µH MSS1048