Datasheet
LTC3675/LTC3675-1
9
36751fc
For more information www.linear.com/LTC3675
Typical perForMance characTerisTics
1A Buck Regulators,
V
OUT1
vs Temperature
1A Buck Regulators, PMOS
Current Limit vs Temperature
1A Buck Regulators, Switch
R
DSON
vs Temperature
500mA Buck Regulators,
Efficiency vs Load
500mA Buck Regulators,
Load Regulation
500mA Buck Regulators,
Line Regulation
1A Buck Regulators, Transient
Response (Pulse-Skipping Mode)
1A Buck Regulators, Transient
Response (Burst Mode Operation)
1A Buck Regulators, No Load
Start-Up Transient
(Pulse-Skipping Mode)
T
A
= 25°C, unless otherwise noted.
50µs/DIV
V
OUT1
100mV/DIV
AC-COUPLED
INDUCTOR
CURRENT
200mA/DIV
0mA
LOAD STEP = 100mA TO 700mA
V
IN
= 3.6V, V
OUT1
= 1.2V
36751 G10
50µs/DIV
V
OUT1
100mV/DIV
AC-COUPLED
INDUCTOR
CURRENT
200mA/DIV
0mA
36751 G11
LOAD STEP = 100mA TO 700mA
V
IN
= 3.6V, V
OUT1
= 1.2V
25µs/DIV
V
OUT1
500mV/DIV
INDUCTOR
CURRENT
500mA/DIV
EN1
2V/DIV
36751 G12
V
IN
= 3.6V
TEMPERATURE (°C)
V
OUT1
(V)
1.25
1.23
1.24
1.21
1.22
1.18
1.17
1.20
1.19
1.16
1.15
–15–35
36751 G13
5 25 65 85 105 125–55 45
V
IN
= 3.6V
V
IN
= 5.5V
V
IN
= 2.7V
PULSE-SKIPPING MODE
LOAD = 500mA
TEMPERATURE (°C)
I
FWD1, 2
(A)
3.6
3.2
3.4
2.8
3.0
2.2
2.0
2.6
2.4
1.8
1.6
–15–35
36751 G14
5 25 65 85 105 125–55 45
V
IN
= 3.6V
V
IN
= 5.5V
V
IN
= 2.7V
TEMPERATURE (°C)
R
DSON
(Ω)
0.60
0.50
0.55
0.40
0.45
0.25
0.20
0.35
0.30
0.15
0.10
0.05
0
–15–35
36751 G15
5 25 65 85 105 125–55 45
NMOS R
DSON
, V
IN
= 5.5V
NMOS R
DSON
, V
IN
= 2.7V
PMOS R
DSON
, V
IN
= 5.5V
PMOS R
DSON
, V
IN
= 2.7V
LOAD CURRENT (mA)
EFFICIENCY (%)
100
80
90
60
70
30
20
50
40
10
0
10
36751 G16
10001 100
V
IN
= 2.7V Burst Mode OPERATION
V
IN
= 3.6V Burst Mode OPERATION
V
IN
= 5.5V Burst Mode OPERATION
V
IN
= 2.7V PULSE SKIPPING-MODE
V
IN
= 3.6V PULSE SKIPPING-MODE
V
IN
= 5.5V PULSE SKIPPING-MODE
V
OUT3
= 1.8V
LOAD CURRENT (mA)
V
OUT3
(V)
1.830
1.820
1.825
1.810
1.815
1.795
1.790
1.805
1.800
1.785
1.780
1.775
1.770
10010
36751 G17
10001
V
IN
= 5.5V
V
IN
= 2.7V
PULSE-SKIPPING MODE
V
IN
= 3.6V
V
IN
(V)
V
OUT3
(V)
1.830
1.810
1.820
1.825
1.815
1.790
1.800
1.805
1.770
1.795
1.785
1.780
1.775
3.53.1
36751 G18
3.9 4.3 5.1 5.52.7 4.7
LOAD = 250mA
PULSE-SKIPPING MODE
LOAD = 50mA