MAX8643 View Datasheet(PDF) - Maxim Integrated
Part Name
Description
Manufacturer
MAX8643 Datasheet PDF : 16 Pages
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3A, 2MHz Step-Down Regulator
with Integrated Switches
ELECTRICAL CHARACTERISTICS (continued)
(VIN = VDD = 3.3V, VFB = 0.5V, TA = -40°C to +85°C. Typical values are at TA = +25°C, circuit of Figure 1, unless otherwise noted.) (Note 2)
PARAMETER
ENABLE
EN Input Logic-Low, Falling
EN Input Logic-High, Rising
EN Hysteresis
EN, Input Current
SS
SS Charging Current
SS Discharge Resistance
THERMAL SHUTDOWN
Thermal-Shutdown Threshold
Thermal-Shutdown Hysteresis
POWER-GOOD (PWRGD)
Power-Good Threshold Voltage
Power-Good Falling-Edge Deglitch
PWRGD Output-Voltage Low
PWRGD Leakage Current
OVERCURRENT LIMIT
Current-Limit Startup Blanking
Restart Time
CONDITIONS
VEN = 0V or 3.6V,
VDD = 3.6V
VSS = 0.45V
TA = +25°C
TA = +85°C
VFB falling, 3mV hysteresis
IPWRGD = 4mA
VDD = VPWRGD = 3.6V, VFB = 0.9V
MIN TYP MAX UNITS
1.2
0.7
V
1.7
1.4
V
200
mV
1
µA
0.01
7
8
9
µA
500
Ω
+165
°C
20
°C
87
90
93
%
48
Clock
cycles
0.03 0.15
V
0.01
µA
128
1024
Clock
cycles
Clock
cycles
Note 2: Specifications are 100% production tested at TA = +25°C. Limits over the operating temperature range are guaranteed by
design and characterization.
Note 3: Guaranteed by design.
Typical Operating Characteristics
(Typical values are at VIN = VDD = 3.3V, VOUT = 1.8V, RFREQ = 50kΩ, IOUT = 3A, and TA = +25°C, unless otherwise noted.)
EFFICIENCY vs. OUTPUT CURRENT
100
EFFICIENCY vs. OUTPUT CURRENT
100
90
80
VOUT = 2.5V
70
VOUT = 1.8V
VOUT = 1.2V
60
50
VIN = VDD = 3.3V
40
0.1
1
10
OUTPUT CURRENT (A)
95
90
85
VOUT = 1.88V
80
VOUT = 1.5V
75
70
VOUT = 1.2V
65
VIN = VDD = 2.5V
60
0.1
1
10
OUTPUT CURRENT (A)
4 _______________________________________________________________________________________
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