LTC3370EUH Datasheet, PDF (7/10 Pages) Linear Technology – 4-Channel 8A Configurable Buck DC/DCs

DEMO MANUAL DC2311A
Application Information
The DC2311A can be used to evaluate each of the eight
configurations of the LTC3370 from 1MHz to 3MHz. The
following efficiency graphs and transient response plots
1A Buck Efficiency vs I_LOAD
100
90
80 BURST
70 ^MODE
60
V_IN = 2.25V
50
V_IN = 3.3V
40
V_IN = 5.5V
V_IN = 2.25V
30
V_IN = 3.3V
20
V_IN = 5.5V
V_OUT = 1.8V
10
FORCED f_OSC = 2MHz
CONTINUOUS MODE L = 2.2µH
0
1
10
100
1000
LOAD CURRENT (mA)
3370 G23
1A Buck Regulator, Transient
Response (Burst Mode Operation)
V_OUT
100mV/DIV
AC-COUPLED
INDUCTOR
CURRENT
200mA/DIV
0mA
50µs/DIV
LOAD STEP = 100mA TO 700mA
V_IN = 3.3V
V_OUT = 1.8V
3370 G46
4A Buck Regulator, Transient
Response (Burst Mode Operation)
V_OUT
100mV/DIV
AC-COUPLED
INDUCTOR
CURRENT
1A/DIV
0mA
50µs/DIV
LOAD STEP = 400mA TO 2.8A
V_IN = 3.3V
V_OUT = 1.8V
3370 G48
illustrate how a 1.8V, 1A regulator performs compared
to a 1.8V, 4A regulator. Please refer to the LTC3370 data
sheet for more performance information for the LTC3370.
4A Buck Efficiency vs I_LOAD
100
90
80 _{BURST MODE}
70
60
50 FORCED
CONTINUOUS
40 _MODE
30
20
10
0
1
10
V_OUT = 1.8V
f_OSC = 2MHz
L = 2.2µH
V_IN = 2.25V
V_IN = 3.3V
V_IN = 5.5V
V_IN = 2.25V
V_IN = 3.3V
V_IN = 5.5V
100
1000
LOAD CURRENT (mA)
3370 G33
1A Buck Regulator, Transient
Response (Forced Continuous Mode)
V_OUT
100mV/DIV
AC-COUPLED
INDUCTOR
CURRENT
200mA/DIV
0mA
50µs/DIV
LOAD STEP = 100mA TO 700mA
V_IN = 3.3V
V_OUT = 1.8V
3370 G47
4A Buck Regulator, Transient
Response (Forced Continuous Mode)
V_OUT
100mV/DIV
AC-COUPLED
INDUCTOR
CURRENT
1A/DIV
0mA
50µs/DIV
LOAD STEP = 400mA TO 2.8A
V_IN = 3.3V
V_OUT = 1.8V
3370 G49
dc2311af
7