Rainbow-electronics MAX8982X Manual do Utilizador Página 21
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Power-Management ICs for
ICERA E400/E450 Platform
MAX8982A/MAX8982X
21
Typical Operating Characteristics (continued)
(MAX8982A: V
IN1A
= V
IN1B
= 5V, MAX8982X: V
IN1A
= V
IN1B
= V
DDA
= V
DDB
= V
IN4
= 3.3V, C
REFBP
= 0.1µF, T
A
= -40°C to +85°C,
Circuits of Figures 2 and 3, unless otherwise noted. Typical values are at T
A
= +25°C. Limits are 100% production tested at T
A
= +25NC,
unless otherwise noted. Limits over the temperature range are guaranteed by design.
)
BUCK2 LOAD REGULATION
MAX8982A toc12
LOAD CURRENT (mA)
OUTPUT VOLTAGE (V)
400200
1.740
1.760
1.780
1.800
1.820
1.720
0 600
L = 1.0µH, MURATA LQM2MPN1R0NG0
DCR = 85m
I
BUCK2 LOAD TRANSIENT
MAX8982A toc13
600mA
1mA
AC-COUPLED
100mV/div
V
OUT
= 1.8V
I
BUCK2
V
BUCK2
40µs/div
LOAD CURRENT (mA)
EFFICIENCY (%)
100101 1000
BUCK2 EFFICIENCY
vs. LOAD CURRENT
MAX8982A toc14
50
60
70
V
IN
= 5.5V
V
IN
= 5V
V
IN
= 4.5V
V
IN
= 4.1V
80
90
100
40
BUCK3 LOAD REGULATION
(MAX8982A ONLY)
MAX8982A toc15
LOAD CURRENT (mA)
OUTPUT VOLTAGE (V)
500400300200100
3.050
3.100
3.150
3.200
3.250
3.300
3.000
0 600
L = 2.2µH, HITACHI METALS LTD
KSLI-252012AG-2R2
DCR = 100m
I
BUCK1 RAMP-UP TRANSITION
MAX8982A toc10
0.6V
1.2V
NO LOAD
12.5mV/µs RAMP RATE
V
BUCK1
20µs/div
BUCK1 RAMP-DOWN TRANSITION
MAX8982A toc11
0.6V
1.2V
I
OUT
= 1.2A
12.5mV/µs RAMP RATE
V
BUCK1
20µs/div
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