Manual

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
= 25kΩ, 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 mΩ
Regulator 1 n-Channel MOSFET
R
DSON
V
DVDD1
= 5V 30 50 mΩ
Regulator 1 Gate Charge V
DVDD1
= 5V 8 nC
Maximum LX1 RMS Current 4A
Regulator 2 p-Channel MOSFET
R
DSON
V
DVDD2
= 5V 100 180 mΩ
Regulator 2 n-Channel MOSFET
R
DSON
V
DVDD2
= 5V 60 100 mΩ
Regulator 2 Gate Charge V
DVDD2
= 5V 4 nC
Maximum LX2 RMS Current 2A
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