Datasheet

MAX8660/MAX8660A/MAX8660B/MAX8661
High-Efficiency, Low-I
Q
, PMICs with Dynamic
Voltage Management for Mobile Applications
15
REG4
EFFICIENCY vs. LOAD CURRENT
LOAD CURRENT (mA)
EFFICIENCY (%)
MAX8660 toc33
50
55
60
65
70
75
80
85
90
95
0.01 0.1 1 10 100 1000
L4 = 4.7µH
(TOKO DE2812C)
V4 = 1.4V
V
IN
= 4.2V
V
IN
= 3.6V
FORCED-PWM
NORMAL
Typical Operating Characteristics (continued)
(Circuit of Figure 3, V
IN
= 3.6V, T
A
= +25°C, unless otherwise noted.)
REG4 OUTPUT VOLTAGE
vs. INPUT VOLTAGE
INPUT VOLTAGE (V)
OUTPUT VOLTAGE (V)
MAX8660 toc34
2.5 3.0 3.5 4.0 4.5 5.0 5.5 6.0
1.35
1.36
1.37
1.38
1.39
1.40
1.41
1.42
I
LOAD
= 300mA
REG4 LINE TRANSIENT
MAX8660 toc35
1V/div
10mV/div
V
IN
V4
40µs/div
200mA LOAD, V5 = 1.4V
5.0V
3.6V
REG4 HEAVY-LOAD SWITCHING WAVEFORMS
MAX8660 toc40
2V/div
2mV/div
200mA/div
0A
V
LX4
V4
I
L4
400ns/div
200mA LOAD
REG4 LIGHT-LOAD SWITCHING WAVEFORMS
MAX8660 toc41
2V/div
20mV/div
200mA/div
0A
V
LX4
V4
I
L4
2µs/div
18mA LOAD
REG4 LOAD REGULATION
LOAD CURRENT (mA)
OUTPUT VOLTAGE (V)
MAX8660 toc36
0 100 200 300 400
1.36
1.37
1.38
1.39
1.40
1.41
1.42
1.43
1.44
V
IN
= 3.6V
FORCED-PWM
NORMAL
REG4 OUTPUT VOLTAGE vs. TEMPERATURE
TEMPERATURE (°C)
OUTPUT VOLTAGE (V)
MAX8660 toc37
-40 -15 10 35 60 85
1.20
1.25
1.30
1.35
1.40
1.45
1.50
400mA LOAD
REG4 VOLTAGE CHANGE RESPONSE
MAX8660 toc38
500mV/div
500mV/div
V4
RISING
V4
FALLING
100µs/div
ACTIVE RAMP-DOWN ENABLED
R
RAMP
= 56kΩ
R
RAMP
= 248kΩ
R
RAMP
= 248kΩ
R
RAMP
= 56kΩ
0.725V
0.725V
1.8V
1.8V
REG4 LOAD TRANSIENT RESPONSE
MAX8660 toc39
50mV/div
200mA/div
V4
I
V4
20µs/div
10mA
350mA