LTC3624_15 Datasheet, PDF (5/20 Pages) Linear Technology – 17V, 2A Synchronous Step-Down Regulator with 3.5A Quiescent Current

LTC3624/LTC3624-2
Typical Performance Characteristics T_J = 25°C, unless otherwise noted.
Efficiency vs Load Current at 1MHz
100
90
80
70
60
50
40
Burst Mode OPERATION
30
20
10
V_IN = 12V
0
0.0001 0.001 0.01
V_OUT = 5V
V_OUT = 3.3V
V_OUT = 2.5V
0.1
12
LOAD CURRENT (A)
36242 G01
Efficiency vs Load Current in
Burst Mode Operation at 2.25MHz
100
90
80
70
60
50
40
Burst Mode OPERATION
30
20
10
V_IN = 12V
0
0.001
0.01
V_OUT = 5V
V_OUT = 3V
V_OUT = 2.5V
0.1
12
LOAD CURRENT (A)
36242 G02
Efficiency vs Load Current in
Dropout
100
90
80
Burst Mode
70 _OPERATION
60
50
FORCE CONTINUOUS
40
MODE
30
20
10
0
0.0001
V_IN = 5V
100% DUTY CYCLE
FREQ = 1MHz
0.001 0.01
0.1
LOAD CURRENT (A)
12
36242 G03
I_Q vs V_IN
10
9
8
7
6
5
4
3
2
1
0
0246
SLEEP
SHUTDOWN
8 10 12 14 16 18 20
V_IN (V)
36242 G04
I_Q vs Temperature
12
Burst Mode Operation
10
8
6
4
2
0
–50
SW
5V/DIV
SLEEP
V_OUT
AC-COUPLED
50mV/DIV
I_L
1A/DIV
SHUTDOWN
0
50
100
TEMPERATURE (°C)
150
36242 G05
4µs/DIV
V_IN = 12V
V_OUT = 2.5V
Burst Mode OPERATION
I_OUT = 30mA
L = 2.2µH
36242 G06
Pulse-Skipping Mode Operation
Load Transient Response
Soft-Start Operation
SW
5V/DIV
V_OUT
AC-COUPLED
50mV/DIV
I_L
1A/DIV
4µs/DIV
V_IN = 12V
V_OUT = 2.5V
PULSE-SKIPPING MODE
I_OUT = 10mA
L = 2.2µH
V_OUT
200mV/DIV
I_L
2A/DIV
36242 G07
I_LOAD
2A/DIV
40µs/DIV
V_IN = 12V
V_OUT = 2.5V
I_LOAD = 0A to 1.8A
FORCED CONTINUOUS MODE
RUN
10V/DIV
I_L
0.5A/DIV
V_OUT
1V/DIV
PGOOD
5V/DIV
36242 G08
V_IN = 12V
V_OUT = 2.5V
I_LOAD = 1A
1ms/DIV
36242 G09
For more information www.linear.com/LTC3624
36242fc
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