Typical operating characteristics (continued) – Rainbow Electronics MAX8982X User Manual
Page 22
Power-Management ICs for
ICERA E400/E450 Platform
MAX8982A/MAX8982X
22
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.)
BUCK3 LOAD TRANSIENT
(MAX8982A ONLY)
MAX8982A toc16
1mA
600mA
AC-COUPLED
100mV/div
I
BUCK3
V
OUT
= 3.2V
C
OUT
= 10µF
V
BUCK3
20µs/div
BUCK3 EFFICIENCY
vs. LOAD CURRENT (MAX8982A ONLY)
MAX8982A toc17
LOAD CURRENT (mA)
EFFICIENCY (%)
100
10
55
60
65
70
75
80
85
90
95
100
50
1
1000
V
IN
= 5V
V
IN
= 5.5V
V
OUT
= 3.2V
V
IN
= 4.1V
V
IN
= 4.5V
BUCK4 LOAD REGULATION
(MAX8982A ONLY)
MAX8982A toc18
LOAD CURRENT (mA)
OUTPUT VOLTAGE (V)
500
400
100
200
300
3.340
3.350
3.360
3.370
3.380
3.390
3.400
3.410
3.330
0
600
L = TAIYO YUDEN NR3015T1R0N
DCR = 30mI
BUCK4 LOAD TRANSIENT (MAX8982A ONLY)
MAX8982A toc19
AC-COUPLED
50mV/div
1.5A
1mA
V
BUCK4
I
BUCK4
20µs/div
V
OUT
= 3.4V
1mA TO 1.5A
BUCK4 EFFICIENCY vs. LOAD CURRENT
(MAX8982A ONLY)
MAX8982A toc20
LOAD CURRENT (mA)
EFFICIENCY (%)
1000
100
10
20
30
40
50
60
70
80
90
100
10
1
10,000
V
IN
= 4.1V
V
IN
= 4.5V
V
IN
= 5V
V
IN
= 5.5V
V
OUT
= 3.4V
BUCK4 SWITCHING FREQUENCY
vs. LOAD CURRENT (MAX8982A ONLY)
MAX8982A toc21
LOAD CURRENT (mA)
SWITCHING FREQUENCY (MHz)
400
200
0.5
1.0
1.5
2.0
2.5
0
0
600