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Dual, 4A/2A, 4MHz, Step-Down DC-DC
Regulator with Dual LDO Controllers
ELECTRICAL CHARACTERISTICS (continued)
(V AVIN = V PVIN_ = V DVDD_ = 3.3V, V PGND_ = V SGND = 0V, R T = 25k ? , 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
FB3, FB4 to B3, B4
Transconductance
B3, B4 Driver Sink Current
5mA sink current, V B_ = 0.5V to 5.5V
2.5mA to 10mA sink current,
V B_ = 0.5V to 5.5V
V FB3, V FB4 = 0V, V B_ = 0.5V to 5.5V
0.585
0.56
20
0.600
1.20
0.615
2.30
V
S
mA
LDO Soft-Start Duration
LDO Reference Voltage Steps
POWER MOSFETS
512
64
Clock
Cycles
Steps
Regulator 1 p-Channel MOSFET
R DSON
Regulator 1 n-Channel MOSFET
R DSON
Regulator 1 Gate Charge
Maximum LX1 RMS Current
Regulator 2 p-Channel MOSFET
R DSON
Regulator 2 n-Channel MOSFET
R DSON
Regulator 2 Gate Charge
Maximum LX2 RMS Current
V DVDD1 = 5V
V DVDD1 = 5V
V DVDD1 = 5V
V DVDD2 = 5V
V DVDD2 = 5V
V DVDD2 = 5V
50
30
8
4
100
60
4
2
90
50
180
100
m ?
m ?
nC
A
m ?
m ?
nC
A
PWM CURRENT LIMIT AND HICCUP MODE
Regulator 1 Peak Current Limit
Regulator 1 Valley Current Limit
Regulator 2 Peak Current Limit
Regulator 2 Valley Current Limit
Number of Cumulative Current-
Limit Events to Hiccup
Number of Consecutive Noncurrent
Limit Cycles to Clear N CL
Hiccup Timeout
N CL
N CLR
N HT
V PVIN = V AVIN = 3.3V
V PVIN = V AVIN = 2.5V
V PVIN = V AVIN = 3.3V
V PVIN = V AVIN = 2.5V
V PVIN = V AVIN = 3.3V
V PVIN = V AVIN = 2.5V
V PVIN = V AVIN = 3.3V
V PVIN = V AVIN = 2.5V
4.5
3.40
4.0
3.0
2.25
1.70
2.0
1.5
4.9
3.65
5.0
3.7
2.45
1.85
2.5
1.85
4
3
8192
5.3
3.95
5.65
4.25
2.65
1.98
2.83
2.13
A
A
A
A
Clock
Cycles
Clock
Cycles
Clock
Cycles
_______________________________________________________________________________________
3
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