Manual
MAX8649
1.8A Step-Down Regulator with Differential
Remote Sense in 2mm x 2mm WLP
6 _______________________________________________________________________________________
EFFICIENCY vs. LOAD CURRENT
(0.9V OUTPUT, SYNC OFF)
MAX8649 toc01
LOAD CURRENT (A)
EFFICIENCY (%)
10.10.010.001
10
20
30
40
50
60
70
80
90
100
0
0.0001 10
POWER SAVE
FORCED PWM
V
IN
= 3.2V
3.6V
4.2V
EFFICIENCY vs. LOAD CURRENT
(1.1V OUTPUT, SYNC OFF)
MAX8649 toc02
LOAD CURRENT (A)
EFFICIENCY (%)
10.10.010.001
10
20
30
40
50
60
70
80
90
100
0
0.0001 10
POWER SAVE
FORCED PWM
V
IN
= 3.2V
3.6V
4.2V
EFFICIENCY vs. LOAD CURRENT
(1.3V OUTPUT, SYNC OFF)
MAX8649 toc03
LOAD CURRENT (A)
EFFICIENCY (%)
10.10.010.001
10
20
30
40
50
60
70
80
90
100
0
0.0001 10
POWER SAVE
FORCED PWM
V
IN
= 3.2V
3.6V
4.2V
EFFICIENCY vs. LOAD CURRENT
(0.9V OUTPUT, 26MHz SYNC)
MAX8649 toc04
LOAD CURRENT (A)
EFFICIENCY (%)
10.10.010.001
10
20
30
40
50
60
70
80
90
100
0
0.0001 10
POWER SAVE
FORCED PWM
V
IN
= 3.2V
3.6V
4.2V
EFFICIENCY vs. LOAD CURRENT
(1.1V OUTPUT, 26MHz SYNC)
MAX8649 toc05
LOAD CURRENT (A)
EFFICIENCY (%)
10.10.010.001
10
20
30
40
50
60
70
80
90
100
0
0.0001 10
POWER SAVE
FORCED PWM
V
IN
= 3.2V
3.6V
4.2V
EFFICIENCY vs. LOAD CURRENT
(1.3V OUTPUT, 26MHz SYNC)
MAX8649 toc06
LOAD CURRENT (A)
EFFICIENCY (%)
10.10.010.001
10
20
30
40
50
60
70
80
90
100
0
0.0001 10
POWER SAVE
FORCED PWM
V
IN
= 3.2V
3.6V
4.2V
SWITCHING FREQUENCY
vs. LOAD CURRENT
MAX8649 toc07
LOAD CURRENT (A)
SWITCHING FREQUENCY (MHz)
1.51.20.90.60.3
0.5
1.0
1.5
2.0
2.5
3.0
3.5
0
0 1.8
TRANSITION TO PWM
FORCED PWM
POWER SAVE
V
IN
= 3.6V
V
OUT
= 1.3V
603510-15-40 85
3.1
3.2
3.3
3.4
3.5
3.6
3.0
TEMPERATURE (°C)
SWITCHING FREQUENCY (MHz)
MAX8649 toc08
SWITCHING FREQUENCY
vs. TEMPERATURE
NO SYNC
1.3V OUTPUT, 500mA LOAD
NO-LOAD SUPPLY CURRENT vs.
SUPPLY VOLTAGE (POWER SAVE)
SUPPLY VOLTAGE (V)
SUPPLY CURRENT (mA)
4.53.5
0.1
0.2
0.3
0.4
0.5
0.6
0
2.5 5.5
MAX8649 toc09
26MHz SYNC
NO SYNC
Typical Operating Characteristics
(
Typical Operating Circuit
, V
IN1
= V
IN2
= 3.6V, V
AGND
= V
PGND
= 0V, V
OUT
= 1.1V, V
DD
= 1.8V, T
A
= +25°C, unless otherwise noted.)