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
ENABLE/SEL
EN_ Threshold
V EN_ rising
1.207
1.225
1.243
V
EN_ Hysteresis
0.12
V
EN_ Input Current
-2.5
+2.5
μA
SEL High Threshold
SEL Low Threshold
0.85 x V AVIN
0.2 x V AVIN
V
V
SEL Input Bias Current
Present only during startup
-100
+100
μA
OSCILLATOR
Switching Frequency Range
f SW
f SW = 4MHz x [V RT (V)/1.067(V)] (Note 4)
4000
kHz
Oscillator Accuracy
Phase Shift Between Regulators
f SW ≤ 1500kHz
f SW > 1500kHz
-6
-10
180
+6
+10
%
Degrees
RT Current
RT Voltage Range
V RT
0 < V RT < 1.067V
31.30
0.130
32.00
32.58
1.067
μA
V
Minimum Controllable On-Time
Minimum Controllable Off-Time
PWM Ramp Amplitude
PWM Ramp Valley
THERMAL SHUTDOWN
60
60
V AVIN /4
0.3
ns
ns
V
V
Thermal Shutdown Temperature
Thermal Shutdown Hysteresis
Temperature rising
+160
15
°C
°C
Note 3: Specifications are 100% production tested at T A = +25°C and T A = +125°C. Maximum and minimum specifications over
temperature are guaranteed by design.
Note 4: When operating with V AVIN = 2.5V, the maximum operating frequency should be derated to 3MHz.
4
_______________________________________________________________________________________
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