MAX8646
6A, 2MHz Step-Down Regulator
with Integrated Switches
4 _______________________________________________________________________________________
PARAMETER CONDITIONS MIN TYP MAX UNITS
Frequency Range 500 2000 kHz
LX Minimum Off-Time V
IN
= 2.5V to 3.3V 40 75 ns
LX Maximum Duty Cycle R
FREQ
= 50kΩ, V
IN
= 2.5V to 3.3V 93 96 %
LX Minimum On-Time R
FREQ
= 50kΩ, V
IN
= 2.5V to 3.3V 80 ns
RMS LX Output Current 6A
ENABLE
EN Input Logic Low, Falling 1.2 0.7 V
EN Input Logic High, Rising 1.7 1.4 V
EN Hysteresis 200 mV
T
A
= +25°C 1
EN, Input Current
V
EN
= 0V or 3.6V,
V
DD
= 3.6V
T
A
= +85°C 0.01
µA
SS
SS Charging Current V
SS
= 0.45V 7 8 9 µA
SS Discharge Resistance 500 Ω
THERMAL SHUTDOWN
Thermal-Shutdown Threshold +165 °C
Thermal-Shutdown Hysteresis 20 °C
POWER-GOOD (PWRGD)
Power-Good Threshold Voltage V
FB
falling, 3mV hysteresis 87 90 93 %
Power-Good Falling Edge
Deglitch
48
Clock
cycles
PWRGD Output Voltage Low I
PWRGD
= 4mA 0.03 0.15 V
PWRGD Leakage Current V
DD
= V
PWRGD
= 3.6V, V
FB
= 0.9V 0.01 µA
OVERCURRENT LIMIT
Current-Limit Startup Blanking 128
Clock
cycles
Restart Time 1024
Clock
cycles
Note 2: Specifications are 100% production tested at T
A
= +25°C. Limits over the operating temperature range are guaranteed by
design and characterization.
Note 3: Guaranteed by design.
ELECTRICAL CHARACTERISTICS (continued)
(V
IN
= V
DD
= 3.3V, V
FB
= 0.5V, T
A
= -40°C to +85°C, typical values are at T
A
= +25°C, circuit of Figure 1, unless otherwise noted.)
(Note 2)
