LTC3617_15 Datasheet, PDF (5/20 Pages) Linear Technology – 6A Monolithic Synchronous Step-Down Regulator for DDR Termination

LTC3617
Typical Performance Characteristics
T_A = 25°C, V_IN = 3.3V, f_O = 1MHz unless otherwise noted.
Sinking Current
SW
2V/DIV
V_OUT
20mV/DIV
I_L
2A/DIV
V_OUT = 1.25V
I_LOAD = –3A
2µs/DIV
Internal Start-Up
RUN
5V/DIV
PGOOD
5V/DIV
V_OUT
500mV/DIV
3617 G10
I_L
2A/DIV
V_OUT = 1.25V
I_LOAD = 0A
500µs/DIV
Tracking Up/Down
PGOOD
5V/DIV
V_OUT/VTTR
500mV/DIV
VDDQIN
2V/DIV
3617 G11
V_OUT = 1.25V
I_LOAD = 3A
2ms/DIV
3617 G12
Switch On-Resistance
vs Input Voltage
50
40
MAIN SWITCH
30
SYNCHRONOUS SWITCH
20
10
0
2.5
3.0 3.5 4.0 4.5
INPUT VOLTAGE (V)
5.0 5.5
3617 G14
Frequency vs R_T Resistor
4.5
R_T = SV_IN
4.0
3.5
3.0
2.5
2.0
1.5
1.0
0.5
0
0 200 400 600 800 1000 1200 1400
RESISTOR ON RT/SYNC PIN (kΩ)
3617 G16
Switch On-Resistance
vs Temperature
50
40
MAIN SWITCH
30
SYNCHRONOUS SWITCH
20
10
0
–50 –30 –10 10 30 50 70 90 110 130
TEMPERATURE (°C)
3617 G15
Frequency vs Temperature
0.8
0.6
R_T = SV_IN
0.4
0.2
0
–0.2
–0.4
–0.6
–0.8
–1.0
–1.2
–50 –30 –10 10 30 50 70 90 100 130
TEMPERATURE (°C)
3617 G17
3617fa
5