LTC3618 Datasheet, PDF (6/24 Pages) Linear Integrated Systems – Dual 4MHz, 3A Synchronous Buck Converter for DDR Termination

LTC3618
TYPICAL PERFORMANCE CHARACTERISTICS T_A = 25°C, V_IN = 3.3V, f = 1MHz, Figure 3 Circuit,
unless otherwise noted.
Load Step Transient in Forced
Continuous Mode, Internal
Compensation
Load Step Transient in Forced
Continuous Mode, Internal
Compensation
Load Step Transient in
Forced Continuous Mode,
Internal Compensation
V_DDQ
500mV/DIV
V_TT
100mV/DIV
V_TT
100mV/DIV
I_L
2A/DIV
V_IN = 5V
10μs/DIV
V_DDQ = 1.8V
I_LOAD = –3A TO 3A
I_L
1A/DIV
3618 G10
V_IN = 5V
20μs/DIV
V_TT = 0.9V
I_LOAD = 0A TO 2A
3618 G11
I_L
1A/DIV
V_IN = 5V
20μs/DIV
V_TT = 0.9V
I_LOAD = –1A TO 1A
3618 G12
Reference Voltage
vs Temperature
0.606
0.604
0.602
0.600
0.598
0.596
0.594
–50 –30 –10 10 30 50 70 90 110 130
TEMPERATURE (°C)
3618 G13
Switch On-Resistance
vs Input Voltage
0.10
0.09
0.08
MAIN SWITCH
0.07
0.06
0.05
SYNCHRONOUS SWITCH
0.04
0.03
0.02
0.01
0
2.25
3.25
4.25
INPUT VOLTAGE (V)
5.25
3618 G14
Frequency vs R_T
4.5
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)
3618 G16
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)
3618 G17
6
Switch On-Resistance
vs Temperature
100
90
MAIN SWITCH
80
70
60
50
SYNCHRONOUS SWITCH
40
30
20
10
0
–40 –25 –10 5 20 35 50 65 80 95 110 125
TEMPERATURE (°C)
3618 G15
Switching Frequency vs Input
Voltage
2.5
2.3
2.1
R_T = SV_IN
1.9
1.7
1.5
1.3
1.1
R_T = 402kΩ
0.9
0.7
0.5
2.25 2.75
3.25 3.75 4.25 4.75
INPUT VOLTAGE (V)
5.25
3618 G18
3618fb