Datasheet

LTC3618
5
3618fc
For more information www.linear.com/LTC3618
Typical perForMance characTerisTics
V
OUT
Load Regulation
Input Voltage Line Regulation
Efficiency vs Load Current Efficiency vs Load Current
Efficiency vs Input Voltage
V
DDQ
= 1.8V
T
A
= 25°C, V
IN
= 3.3V, f = 1MHz, Figure 3 Circuit,
unless otherwise noted.
Efficiency vs Input Voltage
V
TT
= 0.9V
Forced Continuous Mode
Operation (FCM)
INPUT VOLTAGE (V)
30
EFFICIENCY (%)
90
100
20
10
80
50
70
60
40
3618 G04
0
I
LOAD
= 200mA
I
LOAD
= 300mA
I
LOAD
= 1A
I
LOAD
= 2A
I
LOAD
= 3A
5.25
2.25 3.25 3.75 4.25 4.752.75
LOAD CURRENT (A)
30
EFFICIENCY (%)
90
100
20
10
80
50
70
60
40
3618 G02
0
V
TT
= 0.75V
V
TT
= 0.9V
V
TT
= 1.25V
10
0.1 10.01
V
MODE/SYNC
= SV
IN
INPUT VOLTAGE (V)
30
EFFICIENCY (%)
90
100
20
10
80
50
70
60
40
3618 G03
0
I
LOAD
= 200mA
I
LOAD
= 300mA
I
LOAD
= 1A
I
LOAD
= 2A
I
LOAD
= 3A
5.25
2.25 3.25 3.75 4.25 4.752.75
V
MODE/SYNC
= SV
IN
Load Step Transient with
FCM Internal Compensation
Pulse-Skipping Mode
LOAD CURRENT (A)
30
EFFICIENCY (%)
90
100
20
10
80
50
70
60
40
10
3618 G01
0
V
OUT
= 2.5V
V
OUT
= 1.8V
V
OUT
= 1.5V
0.1 10.01
V
MODE/SYNC
= SV
IN
LOAD CURRENT (A)
–3
∆V
OUT
(%)
0.4
0.6
0.8
0.2
0
–2 0–1 1 2 3
–0.8
–1.0
–0.4
–0.2
1.0
–0.6
3618 G05
V
DDQ
= 1.8V
V
TT
= 0.9V
INPUT VOLTAGE (V)
2.25
∆V
OUT
(%)
0.1
0
0.3
0.2
0.4
2.75 3.753.25 4.25 4.75 5.25
–0.5
0.5
–0.3
–0.4
–0.1
–0.2
3618 G06
V
TT
= 0.9V
V
DDQ
= 1.8V
SW1
SW2
L1
1A/DIV
L2
1A/DIV
3618 G07
V
DDQ
= 1.8V
V
TT
= 0.9V
NO LOAD
400ns/DIV
SW1
SW2
L1
1A/DIV
L2
1A/DIV
3618 G08
V
DDQ
= 1.8V
V
TT
= 0.9V
NO LOAD
V
TT
IS ALWAYS IN FORCED CONTINUOUS MODE
400ns/DIV
V
DDQ
200mV/DIV
I
L
2A/DIV
I
LOAD
2A/DIV
3618 G09
V
IN
= 5V
V
DDQ
= 1.8V
I
LOAD
= 0A TO 3A
10µs/DIV