Datasheet

MAX8660/MAX8660A/MAX8660B/MAX8661
High-Efficiency, Low-I
Q
, PMICs with Dynamic
Voltage Management for Mobile Applications
13
REG2 OUTPUT VOLTAGE
vs. INPUT VOLTAGE
INPUT VOLTAGE (V)
OUTPUT VOLTAGE (V)
MAX8660 toc16
2.5 3.0 3.5 4.0 4.5 5.0 5.5 6.0
1.65
1.70
1.75
1.80
1.85
1.90
1.95
10mA LOAD
800mA LOAD
REG2 LINE TRANSIENT
MAX8660 toc17
1V/div
100mV/div
V
IN
V2
40µs/div
450mA LOAD,
V2 = 1.8V
5.0V
3.6V
Typical Operating Characteristics (continued)
(Circuit of Figure 3, V
IN
= 3.6V, T
A
= +25°C, unless otherwise noted.)
REG2 LOAD REGULATION
LOAD CURRENT (mA)
OUTPUT VOLTAGE (V)
MAX8660 toc18
0 200 400 600 800
1.75
1.77
1.79
1.81
1.83
1.85
V
IN
= 3.6V
-1.7%/A
FORCED-PWM
NORMAL
REG2 OUTPUT VOLTAGE vs. TEMPERATURE
TEMPERATURE (°C)
OUTPUT VOLTAGE (V)
MAX8660 toc19
-40 -15 10 35 60 85
1.70
1.72
1.74
1.76
1.78
1.80
1.82
1.84
1.86
1.88
1.90
800mA LOAD
REG2 DROPOUT VOLTAGE vs. LOAD CURRENT
LOAD CURRENT (mA)
DROPOUT VOLTAGE (mV)
MAX8660 toc20
0 200 400 600 800 1000
0
50
100
150
200
250
300
THE NOMINAL ESR OF TOKO'S 2.0µH
DE2812C INDUCTOR IS 67mΩ. THE NOMINAL
p-CHANNEL RESISTANCE OF THE REG2 IS
180mΩ. THE SLOPE OF THIS LINE SHOWS
THAT THE TOTAL REG2 DROPOUT
RESISTANCE OF AN AVERAGE
PART, BOARD, INDUCTOR
COMBINATION IS 255mΩ.
REG2 LOAD TRANSIENT
MAX8660 toc21
200mA/div
100mV/div
V2
I
V2
20µs/div
V2 = 1.8V
10mA
600mA
REG2 EFFICIENCY vs. LOAD CURRENT
LOAD CURRENT (mA)
EFFICIENCY (%)
MAX8660 toc15
50
55
60
65
70
75
80
85
90
95
0.01 0.1 1 10 100 1000
V
IN
= 4.2V
V
IN
= 3.6V
L2 = 2.0µH
(TOKO DE2812C)
V2 = 1.8V
FORCED-PWM
NORMAL
REG2 HEAVY-LOAD SWITCHING WAVEFORMS
MAX8660 toc22
2mV/div
0A
2V/div
1A/div
V2
I
L2
V
LX2
400ns/div
800mA LOAD
REG2 LIGHT-LOAD SWITCHING WAVEFORMS
MAX8660 toc23
20mV/div
0A
2V/div
200mA/div
V2
I
L2
V
LX2
2µs/div
30mA LOAD