LTC3370_15 Datasheet, PDF (10/24 Pages) Linear Technology – 4-Channel 8A Configurable Buck DC/DCs

LTC3370
Typical Performance Characteristics T_A = 25°C, unless otherwise noted.
1A Buck Efficiency vs Frequency
(Forced Continuous Mode)
100
I_LOAD = 100mA
90
80
I_LOAD = 500mA
70
I_LOAD = 20mA
60
50
40
30
20 _{VOUT = 1.8V}
10 VIN = 3.3V
L = 3.3µH
0
1 1.2 1.4 1.6 1.8 2 2.2 2.4 2.6 2.8 3
FREQUENCY (MHz)
3370 G37
1A Buck Regulator Load Regulation
(Forced Continuous Mode)
1.820
1.816
1.812
1.808
1.804
V_IN = 5.5V
V_IN = 3.3V
1.800
1.796
1.792
1.788
V_IN = 2.25V
DROPOUT
1.784 ^fOSC ^{= 2MHz}
L = 2.2µH
1.780
1
10
100
LOAD CURRENT (mA)
1000
3370 G38
4A Buck Regulator Load Regulation
(Forced Continuous Mode)
1.820
1.816
1.812
1.808
1.804
1.800
V_IN = 5.5V
V_IN = 3.3V
1.796
1.792
V_IN = 2.25V
1.788
1.784 ^fOSC ^{= 2MHz}
L = 2.2µH
1.780
1
10
DROPOUT
100
LOAD CURRENT (mA)
1000
3370 G39
1A Buck Regulator Line Regulation
(Forced Continuous Mode)
1.820
1.815
1A Buck Regulator No-Load Start-Up
Transient(Burst Mode Operation)
V_IN = 3.3V
V_OUT = 1.8V
1A Buck Regulator No-Load Start-Up
Transient (Forced Continuous Mode)
V_IN = 3.3V
V_OUT = 1.8V
1.810
1.805
1.800
1.795
I_LOAD = 100mA
I_LOAD = 500mA
V_OUT
500mV/DIV
INDUCTOR
CURRENT
500mA/DIV
1.790
EN
2V/DIV
1.785 _{fOSC = 2MHz}
L = 2.2µH
1.780
2.25 2.75 3.25 3.75 4.25 4.75 5.25
V_IN (V)
3370 G40
200µs/DIV
3370 G41
V_OUT
500mV/DIV
INDUCTOR
CURRENT
500mA/DIV
EN
2V/DIV
200µs/DIV
3370 G42
4A Buck Regulator No-Load Start-Up
Transient (Burst Mode Operation)
4A Buck Regulator No-Load Start-Up
Transient (Forced Continuous Mode)
1A Buck Regulator Transient
Response (Burst Mode Operation)
V_IN = 3.3V
V_OUT = 1.8V
V_OUT
500mV/DIV
INDUCTOR
CURRENT
500mA/DIV
EN
2V/DIV
200µs/DIV
V_IN = 3.3V
V_OUT = 1.8V
V_OUT
500mV/DIV
INDUCTOR
CURRENT
500mA/DIV
3370 G43
EN
2V/DIV
200µs/DIV
V_OUT
100mV/DIV
AC-COUPLED
INDUCTOR
CURRENT
200mA/DIV
0mA
3370 G44
50µs/DIV
LOAD STEP = 100mA TO 700mA
V_IN = 3.3V
V_OUT = 1.8V
3370 G45
3370f
10
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