LTC3115-2_15 Datasheet, PDF (9/42 Pages) Linear Technology – 40V, 2A Synchronous Buck-Boost DC/DC Converter

LTC3115-2
Typical Performance Characteristics (T_A = 25°C unless otherwise specified)
Die Temperature Rise vs Load
Current, V_OUT = 12V, f_SW = 750kHz
80
V_IN = 36V
70
V_IN = 24V
V_IN = 12V
60
V_IN = 6V
Load Transient (0A to 1A),
V_IN = 24V, V_OUT = 5V
LOAD
CURRENT
(1A/DIV)
50
40
30
20
10
0
0
V_OUT
(200mV/DIV)
INDUCTOR
CURRENT
(1A/DIV)
STANDARD DEMO PCB
L = 15µH MSS1048
0.5
1
1.5
2
LOAD CURRENT (A)
31152 G51
FRONT PAGE
APPLICATION
500µs/DIV
Output Voltage Ripple in
Burst Mode Operation,
V_IN = 24V, V_OUT = 5V
Soft-Start Waveforms
Load Transient (0A to 0.8A),
V_IN = 3.6V, V_OUT = 5V
LOAD
CURRENT
(1A/DIV)
V_OUT
(200mV/DIV)
31152 G39
INDUCTOR
CURRENT
(2A/DIV)
FRONT PAGE
APPLICATION
500µs/DIV
31152 G40
Output Voltage Ripple in PWM
Mode, V_IN = 24V, V_OUT = 5V
V_OUT
(50mV/DIV)
INDUCTOR
CURRENT
(0.5A/DIV)
L = 15µH
C_OUT = 22µF
I_LOAD = 25mA
20µs/DIV
V_RUN
(5V/DIV)
V_CC
(2V/DIV)
31152 G41
V_OUT
(2V/DIV)
INDUCTOR
CURRENT
(1A/DIV) _{FRONT PAGE}
APPLICATION
2ms/DIV
INDUCTOR
CURRENT
(100mA/DIV)
V_OUT
(5mV/DIV)
31152 G42
L = 22µH
C_OUT = 22µF
I_LOAD = 2A
f_SW = 750kHz
1µs/DIV
31152 G43
Burst Mode Operation to PWM
Mode Output Voltage Transient
Phase-Locked Loop Acquisition,
V_IN = 24V 1.2MHz Clock
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
500µs/DIV
V_PWM/SYNC
(5V/DIV)
V_OUT
(200mV/DIV)
INDUCTOR
CURRENT
(1A/DIV)
31152 G44
FRONT PAGE
APPLICATION
50µs/DIV
V_PWM/SYNC
(5V/DIV)
V_OUT
(200mV/DIV)
INDUCTOR
CURRENT
(1A/DIV)
31152 G45
FRONT PAGE
APPLICATION
50µs/DIV
31152 G46
For more information www.linear.com/LTC3115-2
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