Rainbow Electronics MAX8982X - Manual (Page 11)

Power-Management ICs for
ICERA E400/E450 Platform
MAX8982A/MAX8982X
11
BUCK3 ELECTRICAL CHARACTERISTICS (continued)
(MAX8982A only, V IN1A = V IN1B = +5.0V, C OUT1,2,3+CIN_ = 1000FF, C REFBP = 0.1FF, C OUT = 2.2FF, L = 2.2FH, T A = -40NC to
+85NC, unless otherwise noted. Typical values are at T A = +25NC.) (Note 3)
BUCK4 ELECTRICAL CHARACTERISTICS
(MAX8982A only, V
IN1A
= V
IN1B = +5.0V, C OUT1,2,3+CIN_
= 1000FF, C
REFBP
= 0.1FF, C
OUT
= 20FF, L = 1FH, T
A = -40NC to +85NC,
unless otherwise noted. Typical values are at T A = +25NC.) (Note 3)
PARAMETER CONDITIONS MIN TYP MAX UNITS
Current Limit
pFET switch 700 1100 1500
mA
nFET rectifier 500 750 1200
On-Resistance
pFET switch, I LX3 = -150mA 0.65
I
nFET rectifier, I LX3 = 150mA 0.3
Rectifier Off Current Threshold 80 mA
Minimum On-Time t ON 70 ns
Minimum Off-Time t OFF 70 ns
Shutdown Output Resistance
(Active Discharge Resistance)
I 2 C programmable, default off 1 kI
PARAMETER CONDITION MIN TYP MAX UNITS
Default Output Voltage I LOAD = 100mA 3.298 3.40 3.502 V
Programmable Output Voltage
I LOAD = 100mA,
programmable output voltage step = 50mV
3.00
V
3.05
3.10
3.15
3.20
3.25
3.30
3.35
3.40
3.45
3.50
3.55
3.60
3.65
3.70
3.75
Efficiency (Note 4) V BUCK4 = 3.4V, I LOAD = 500mA 90 %
Maximum Output Current 1800 mA
p-Channel On-Resistance I LX4 = 150mA 100 mI
n-Channel On-Resistance I LX4 = 150mA 100 mI
p-Channel Current-Limit Threshold 2700 mA
n-Channel Negative Current Limit 1500 mA
Maximum Duty Cycle 100 %
Minimum Duty Cycle 16.5 %
PWM Frequency f OSC 1.8 2.0 2.2 MHz
Shutdown Output Resistance
(Active Discharge Resistance) I 2 C programmable,
default off
1 kI