Electrical characteristics (continued) – Rainbow Electronics MAX15022 User Manual
Page 3
MAX15022
Dual, 4A/2A, 4MHz, Step-Down DC-DC
Regulator with Dual LDO Controllers
_______________________________________________________________________________________
3
ELECTRICAL CHARACTERISTICS (continued)
(V
AVIN
= V
PVIN_
= V
DVDD_
= 3.3V, V
PGND_
= V
SGND
= 0V, R
T
= 25k
Ω, and T
A
= T
J
= -40°C to +125°C, unless otherwise noted.
Typical values are at T
A
= +25°C.) (Note 3)
PARAMETER
SYMBOL
CONDITIONS
MIN
TYP
MAX
UNITS
LDO CONTROLLERS
FB3, FB4 Input Bias Current
-250
+250
nA
FB3, FB4 Voltage Set-point
5mA sink current, V
B_
= 0.5V to 5.5V
0.585
0.600
0.615
V
FB3, FB4 to B3, B4
Transconductance
2.5mA to 10mA sink current,
V
B_
= 0.5V to 5.5V
0.56
1.20
2.30
S
B3, B4 Driver Sink Current
V
FB3,
V
FB4
= 0V, V
B_
= 0.5V to 5.5V
20
mA
LDO Soft-Start Duration
512
Clock
Cycles
LDO Reference Voltage Steps
64
Steps
POWER MOSFETS
Regulator 1 p-Channel MOSFET
R
DSON
V
DVDD1
= 5V
50
90
m
Ω
Regulator 1 n-Channel MOSFET
R
DSON
V
DVDD1
= 5V
30
50
m
Ω
Regulator 1 Gate Charge
V
DVDD1
= 5V
8
nC
Maximum LX1 RMS Current
4
A
Regulator 2 p-Channel MOSFET
R
DSON
V
DVDD2
= 5V
100
180
m
Ω
Regulator 2 n-Channel MOSFET
R
DSON
V
DVDD2
= 5V
60
100
m
Ω
Regulator 2 Gate Charge
V
DVDD2
= 5V
4
nC
Maximum LX2 RMS Current
2
A
PWM CURRENT LIMIT AND HICCUP MODE
V
PVIN
= V
AVIN
= 3.3V
4.5
4.9
5.3
Regulator 1 Peak Current Limit
V
PVIN
= V
AVIN
= 2.5V
3.40
3.65
3.95
A
V
PVIN
= V
AVIN
= 3.3V
4.0
5.0
5.65
Regulator 1 Valley Current Limit
V
PVIN
= V
AVIN
= 2.5V
3.0
3.7
4.25
A
V
PVIN
= V
AVIN
= 3.3V
2.25
2.45
2.65
Regulator 2 Peak Current Limit
V
PVIN
= V
AVIN
= 2.5V
1.70
1.85
1.98
A
V
PVIN
= V
AVIN
= 3.3V
2.0
2.5
2.83
Regulator 2 Valley Current Limit
V
PVIN
= V
AVIN
= 2.5V
1.5
1.85
2.13
A
Number of Cumulative Current-
Limit Events to Hiccup
N
CL
4
Clock
Cycles
Number of Consecutive Noncurrent
Limit Cycles to Clear N
CL
N
CLR
3
Clock
Cycles
Hiccup Timeout
N
HT
8192
Clock
Cycles