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| LTC3618 Datasheet, PDF (5/24 Pages) Linear Integrated Systems – Dual 4MHz, 3A Synchronous Buck Converter for DDR Termination | |||
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LTC3618
TYPICAL PERFORMANCE CHARACTERISTICS TA = 25°C, VIN = 3.3V, f = 1MHz, Figure 3 Circuit,
unless otherwise noted.
Efï¬ciency vs Load Current
100
VMODE/SYNC = SVIN
90
80
70
60
50
40
30
20
10
0
0.01
VOUT = 2.5V
VOUT = 1.8V
VOUT = 1.5V
0.1
1
LOAD CURRENT (A)
10
3618 G01
Efï¬ciency vs Load Current
100
VMODE/SYNC = SVIN
90
80
70
60
50
40
30
20
10
0
0.01
VTT = 0.75V
VTT = 0.9V
VTT = 1.25V
0.1
1
LOAD CURRENT (A)
10
3618 G02
Efï¬ciency vs Input Voltage
VDDQ = 1.8V
100
90
80
70
60
50
VMODE/SYNC = SVIN
40
30
ILOAD = 200mA
20
ILOAD = 300mA
ILOAD = 1A
10
ILOAD = 2A
ILOAD = 3A
0
2.25 2.75 3.25 3.75 4.25 4.75 5.25
INPUT VOLTAGE (V)
3618 G03
Efï¬ciency vs Input Voltage
VTT = 0.9V
100
90
80
70
60
50
40
30
ILOAD = 200mA
20
ILOAD = 300mA
ILOAD = 1A
10
ILOAD = 2A
ILOAD = 3A
0
2.25 2.75 3.25 3.75 4.25 4.75 5.25
INPUT VOLTAGE (V)
3618 G04
Forced Continuous Mode
Operation (FCM)
SW1
L1
1A/DIV
SW2
L2
1A/DIV
VDDQ = 1.8V
VTT = 0.9V
NO LOAD
400ns/DIV
3618 G07
VOUT Load Regulation
1.0
0.8
0.6
0.4
VTT = 0.9V
0.2
0
VDDQ = 1.8V
â0.2
â0.4
â0.6
â0.8
â1.0
â3
â2 â1 0
1
LOAD CURRENT (A)
2
3
3618 G05
Input Voltage Line Regulation
0.5
0.4
0.3
0.2
VTT = 0.9V
0.1
0
VDDQ = 1.8V
â0.1
â0.2
â0.3
â0.4
â0.5
2.25 2.75 3.25 3.75 4.25 4.75 5.25
INPUT VOLTAGE (V)
3618 G06
Pulse-Skipping Mode
Load Step Transient with
FCM Internal Compensation
VDDQ
200mV/DIV
SW1
L1
1A/DIV
SW2
L2
1A/DIV
IL
2A/DIV
ILOAD
2A/DIV
VDDQ = 1.8V
VTT = 0.9V
NO LOAD
400ns/DIV
3618 G08
VTT IS ALWAYS IN FORCED CONTINUOUS MODE
VIN = 5V
10μs/DIV
VDDQ = 1.8V
ILOAD = 0A TO 3A
3618 G09
3618fb
5
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