MAX8643 Maxim Integrated Products, MAX8643 Datasheet - Page 4

• Manufacturer Part Number: MAX8643
• Description: 2MHz Step-Down Regulator
• Manufacturer: Maxim Integrated Products

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3A, 2MHz Step-Down Regulator
with Integrated Switches
ELECTRICAL CHARACTERISTICS (continued)
(V
Note 2: Specifications are 100% production tested at T
Note 3: Guaranteed by design.
(Typical values are at V
4
ENABLE
EN Input Logic-Low
EN Input Logic-High
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
IN
_______________________________________________________________________________________
= V
DD
design and characterization.
= 3.3V, V
PARAMETER
100
90
80
70
60
50
40
FB
0.1
V
= 0.5V, T
EFFICIENCY vs. OUTPUT CURRENT
IN
IN
= V
= V
DD
= 3.3V
DD
V
OUT
OUTPUT CURRENT (A)
A
= 3.3V, V
V
= -40°C to +85°C. Typical values are at T
= 1.2V
OUT
= 1.8V
1
V
OUT
OUT
V
V
V
V
I
V
PWRGD
EN
DD
SS
FB
DD
= 2.5V
= 1.8V, R
= 0.45V
falling, 3mV hysteresis
= 0V or 3.6V,
= 3.6V
= V
PWRGD
= 4mA
10
FREQ
A
= +25°C. Limits over the operating temperature range are guaranteed by
= 3.6V, V
CONDITIONS
= 50kΩ, I
FB
T
T
= 0.9V
OUT
Typical Operating Characteristics
A
A
A
= +25°C
= +85°C
= +25°C, circuit of Figure 1, unless otherwise noted.) (Note 2)
= 3A, and T
100
95
90
85
80
75
70
65
60
0.1
V
EFFICIENCY vs. OUTPUT CURRENT
IN
= V
V
DD
OUT
A
= 2.5V
= +25°C, unless otherwise noted.)
V
= 1.2V
OUTPUT CURRENT (A)
OUT
= 1.5V
V
OUT
1
= 1.88V
MIN
1.7
87
7
+165
1024
TYP
0.01
0.03
0.01
500
128
20
90
48
8
10
MAX
0.15
0.7
93
1
9
UNITS
cycles
cycles
cycles
Clock
Clock
Clock
µA
µA
°C
°C
µA
Ω
%
V
V
V