Typical operating characteristics (continued) – Rainbow Electronics MAX8982X User Manual
Page 21
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)
400
200
1.740
1.760
1.780
1.800
1.820
1.720
0
600
L = 1.0µH, MURATA LQM2MPN1R0NG0
DCR = 85mI
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 (%)
100
10
1
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)
500
400
300
200
100
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 = 100mI
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