LTC3867_15 Datasheet, PDF (6/36 Pages) Linear Technology – Low IQ, Dual 2-Phase Synchronous Step-Down Controller

LTC3867
TYPICAL PERFORMANCE CHARACTERISTICS
Load Step-Up (0A to 15A, 15A/µs)
(Nonlinear Operation)
Load Step-Up (0A to 15A, 15A/µs)
(Normal Operation)
Overcurrent Recovery
V_OUT
50mV/DIV
97.5mV
V_OUT
50mV/DIV
137.5mV
V_OUT
500mV/DIV
SW
5V/DIV
SW
5V/DIV
I_OUT
10A/DIV
5µs/DIV
3867 G01
Efficiency and Output Current
and Mode
100
4.0
Burst Mode OPERATION
90
DCM
3.5
80
CCM
3.0
70
60
2.5
50
2.0
40
30
20
10
0
0.01
1.5
1.0
V_IN = 12V
0.5
V_OUT = 1.5V ₀
0.1
1
10
100
LOAD CURRENT (A)
3867 G21
Coincident Tracking Master Supply
MASTER
SUPPLY
500mV/DIV
V_OUT
500mV/DIV
10ms/DIV
3867 G06
5µs/DIV
3867 G02
200µs/DIV
3867 G03
Quiescent Current vs Temperature
4.5
Pre-Bias Start-Up
V_OUT
4.0
200mV/DIV
3.5
TRACK/SS
500mV/DIV
3.0
10ms/DIV
3867 G05
2.5
–50 –25
0 25 50 75
TEMPERATURE (°C)
100 125
3867 G04
Quiescent Current vs Input
Voltage without EXTV_CC
3.50
INTV_CC Line Regulation
5.5
5.0
3.25
4.5
4.0
3.00
3.5
2.75
2.50
4 8 12 16 20 24 28 32 36 40
INPUT VOLTAGE (V)
3867 G07
3.0
2.5
2.0
0
5 10 15 20 25 30 35 40 45
INPUT VOLTAGE (V)
3867 G08
3867f
6