LTC3622_15 Datasheet, PDF (5/24 Pages) Linear Technology – 17V, Dual 1A Synchronous Step-Down Regulator with Ultralow Quiescent Current

LTC3622/
LTC3622-2/LTC3622-23/5
Typical Performance Characteristics V_IN1 = V_IN2 = 12V, T_A = 25°C, unless otherwise noted.
Efficiency vs Load Current
100
90
80
70
V_OUT = 2.5V
60
V_OUT = 5V
50
40
30
20 _{VIN = 12V}
10 fSW = 1MHz
BURST MODE OPERATION
0
0.0001 0.001
0.01
0.1
LOAD CURRENT (A)
1
3622 G01
Efficiency vs Load Current at
Dropout Operation
100
90
80
70
60
50
40
30
20 _{VIN = 5V}
10 100% Duty Cycle
0 ^{fSW = 2.25MHz}
0.0001 0.001
0.01
BURST MODE
PULSE SKIP
0.1
1
LOAD CURRENT (A)
3622 G02
Efficiency vs Load Current
100
90
80
70
60
50
40
30
V_OUT = 2.5V
V_OUT = 3.3V
20 _{VIN = 12V}
10 ^fSW ^{= 2.25MHz}
Burst Mode OPERATION
0
0.0001 0.001
0.01
0.1
LOAD CURRENT (A)
1
3622 G03
V_OUT Efficiency vs Input Voltage
Above and Below Dropout
96
84
72
I_LOAD = 100µA
I_LOAD = 10mA
I_LOAD = 1mA
60
48
36
24
V_OUT = 4.25V
12 f_SW = 1MHz
Burst Mode OPERATION
0
2.5 4.5 6.5 8.5 10.5 12.5 14.5 16.5 18.5
INPUT VOLTAGE (V)
3622 G04
Efficiency vs Load Current
90
80
70
60
50
40
30
20 ^VIN ^{= 12V}
V_OUT = 1.8V
10 f_SW = 1MHz
Burst Mode OPERATION
0
0.001
0.01
0.1
LOAD CURRENT (A)
1
3622 G05
Efficiency vs Input Voltage
95
10mA LOAD
1A LOAD
90
85
80
75 _{VOUT = 2.5V}
f_SW = 1MHz
Burst Mode OPERATION
70
0 2 4 6 8 10
12 14
INPUT VOLTAGE (V)
16 18
3622 G06
I_Q vs V_IN
5
4
3
Burst Mode Operation
SW
10V/DIV
I_Q BURST MODE
I_Q SHUT DOWN
V_OUT
AC-COUPLED
50mV/DIV
2
IL
200mA/DIV
1
4µs/DIV
0
0 2 4 6 8 10 12 14 16 18
INPUT VOLTAGE (V)
3622 G07
V_IN = 12V
V_OUT = 2.5V
BURST MODE OPERATION
I_OUT = 75mA
Pulse-Skipping Mode Operation
SW
10V/DIV
V_OUT
AC-COUPLED
20mV/DIV
I_L
100mA/DIV
3622 G08
4µs/DIV
V_IN = 12V
V_OUT = 2.5V
PULSE-SKIPPING MODE
I_OUT = 10mA
3622 G09
For more information www.linear.com/LTC3622
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