Datasheet

LTC3625/LTC3625-1
5
3625f
Buck Input Power vs R
PROG
Buck Efficiency vs I
BUCK
R
PROG
(kΩ)
0
INPUT POWER (W)
8
7
6
5
4
3
2
1
0
400
3625 G05
100 200 300 50035050 150 250 450
V
IN
= 5.5V
V
MID
= 2.65V
CTL = 0V
V
SEL
= V
IN
I
PROG
CLAMPED
I
BUCK
(mA)
200
EFFICIENCY (%)
80
90
100
2200
3625 G06
70
60
75
85
95
65
55
50
700
1200
1700
V
IN
= 3.6V
V
MID
= 2V
CTL = 0V
Typical perForMance characTerisTics
T
A
= 25°C, L1 = 3.3µH, L2 = 3.3µH, C
IN
= 10µF, C
TOP
= C
BOT
, LTC3625 unless otherwise specified.
Buck Input Power vs V
MID
V
MID
(V)
0.2
0
INPUT POWER (W)
1
2
3
4
6
0.6
1.0 1.4 1.8
3625 G07
2.2 2.6
5
V
IN
= 5.5V
V
SEL
= V
IN
CTL = 0
R
PROG
= 71.5k
R
PROG
= 143k
R
PROG
= 286k
Buck Efficiency vs V
MID
Buck Output Current vs V
MID
V
MID
(V)
0.2
40
EFFICIENCY (%)
50
60
70
80
100
0.6
1.0 1.4 1.8
3625 G08
2.2 2.6
90
V
IN
= 5.5V
V
SEL
= V
IN
CTL = 0
R
PROG
= 71.5k
R
PROG
= 143k
R
PROG
= 286k
V
MID
(V)
0.2
0
I
BUCK
(mA)
500
1000
1500
0.6
1.0
1.4 1.8
3625 G09
2.2
2000
2500
250
750
1250
1750
2250
2.6
V
IN
= 5.5V
V
SEL
= V
IN
CTL = 0
R
PROG
= 71.5k
R
PROG
= 143k
R
PROG
= 286k
Boost Input Current vs V
TOP
V
TOP
(V)
–1.5
I
BOOST
(mA)
1500
2000
2500
0 1.0 2.5
3625 G10
1000
500
0
–1.0 –0.5
0.5
1.5 2.0
V
IN
= 3.6V
V
MID
= 2.5V
V
TOP
= V
OUT
– V
MID
CTL = 0
NORMAL OPERATION
V
OUT
TRICKLE
CHARGE
OPERATION
RFET vs TemperatureBoost Efficiency vs V
TOP
V
TOP
(V)
–1.5
EFFICIENCY (%)
60
70
80
1.5
3625 G11
50
40
–0.5 0.5
–1.0 2.0
0 1.0 2.5
30
20
90
V
IN
= 3.6V
V
MID
= 2.5V
V
TOP
= V
OUT
– V
MID
CTL = 0
NORMAL OPERATION
V
OUT
TRICKLE
CHARGE OPERATION
TEMPERATURE (°C)
–40 –25 –10 5 20 35 50 65 80 95 110
125
PMOS R
DS(ON)
(Ω)
NMOS R
DS(ON)
(Ω)
0.15
3625 G12
0
0.20
0.10
0.05
0.20
0.05
0.25
0.15
0.10
V
IN
= 2.7V
V
IN
= 5.5V
PMOS
NMOS
Charge Time vs R
PROG
R
PROG
(kΩ)
0
TIME (SECONDS)
400
350
300
250
200
150
100
50
0
400
3625 G15
100 200 300 50035050 150 250 450
SINGLE
INDUCTOR
APPLICATION
DUAL
INDUCTOR
APPLICATION
V
IN
= 3.6V
V
SEL
= 3.6V
V
OUT
INITIAL = 0V
C
TOP
= C
BOT
= 10F
I
PROG
CLAMPED